JPH08110541A - Camera provided with image blurring correcting function - Google Patents

Abstract

PURPOSE: To provide a camera provided with an image blurring correcting function capable of eliminating an influence caused by a shake to the minimum even in the case a shake quantity is beyond the correctable extent by a correcting means. CONSTITUTION: When a release switch is turned on, a difference ΔAv between a set aperture value Av and the maximum aperture value Avmax obtained when the aperture diameter is made smallest is obtained(S6), then, the camera starts exposing (S7). While exposing, the detection and calculation of the shake quantity(S8), the drive of the correction lens(S9) are repeatedly executed until the exposure time is ended. And in the case of judging that the shake quantity is larger than the correctable maximum value (S12), a light shielding means is operated, and the diaphragm is set to the maximum aperture value Avmax so as to perform diaphragming as much as possible. When the operation of the light shielding means is completed, a counter value is decremented at a prescribed ratio(S22), then, the exposure reduced by operating the light shielding means is compensated by prolonging the exposure time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having an image blur correction function capable of canceling the movement of a subject image on the image receiving surface due to camera shake when the camera vibrates with respect to the object due to camera shake or the like. .

[0002]

2. Description of the Related Art A conventional camera having an image blur correction function integrates an output signal from an angular velocity sensor provided as a blur detecting means to calculate a blur amount, and based on the calculation result, an optical path of a photographing optical system. By driving a correction means such as a correction optical system provided therein, movement of the subject image on the image receiving surface of the camera, for example, the film surface or the light receiving surface of the photoelectric conversion element is compensated.

[0003]

However, there is a structural upper limit to the amount of blur that can be corrected by the correction optical system, and if the amount of blur exceeds that limit, correction cannot be performed.
In the conventional camera having the image blur correction function, no measures are taken when the blur amount exceeds the correctable range, and when the blur exceeds the limit, the effect remains. There is a problem that it is shot as it is.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. Even when the amount of blur exceeds a range that can be corrected by the correction means, the influence of the blur can be eliminated as much as possible. An object of the present invention is to provide a camera having an image blur correction function that can be performed.

[0005]

In order to achieve the above object, a camera having an image blur correction function according to the present invention has a photographing optical system for forming a subject image on an image receiving surface, and the photographing optical system for the subject. A blur detecting unit that detects a blur of the system, an image blur correcting unit that cancels the movement of the subject image on the image receiving surface based on a signal from the blur detecting unit, and the image blur correcting unit that is provided in the photographing optical system and reach the image receiving surface. Shading means for blocking at least a part of the light flux, setting means for setting the aperture value and shutter speed based on the set exposure value, and blurring detected during exposure at the values set by the setting means When the amount exceeds a predetermined reference value, a light-shielding control unit that controls the light-shielding unit so as to reduce the amount of light reaching the imaging surface, and when the light-shielding control unit operates, compensates for the exposure amount that has decreased due to the action of the light-shielding unit. And having a changing means for changing at least one of the set aperture value and shutter speed by cormorants setting means.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Two embodiments of a camera having an image blur correction function according to the present invention will be described below. Example 1 is an example in which the present invention is applied to a single-lens reflex camera. In addition to the function of the diaphragm provided in the photographing lens as the original diaphragm,
It functions as a light blocking means. The second embodiment is an example in which the present invention is applied to a lens shutter camera, and the lens shutter provided in the taking lens functions not only as an original shutter and diaphragm but also as a light shielding unit.

[0007]

First Embodiment FIGS. 1 to 4 show a single-lens reflex camera 1 having an image blur correction function according to a first embodiment. As shown in FIG. 1, the single-lens reflex camera 1 is incident through a photographing optical system 2 for forming a subject image on a film F which is an image receiving surface, a part of the photographing optical system 2, and a quick return mirror 3. A viewfinder optical system 4 for guiding the subject light reflected by the camera to the photographer's eyes, a shutter button 20, a control means 30 for controlling the entire camera, and an image blur correction means 40 are provided.

The photographic optical system 2 is provided with a diaphragm 5 for determining the exposure amount per unit time during photographing. Aperture 5
Also functions as a light blocking unit that blocks at least a part of the light flux reaching the film surface F when the blur amount during exposure exceeds the correctable range. Also, in front of the film surface F,
A focal plane shutter 6 is provided.

The shutter button 20 is a two-step switch, and when pressed one step, the photometric switch is turned on.
Then, when it is pushed in two steps, the release switch turns on. The ON / OFF information of these switches is input to the control means 30.

Further, the camera 1 is provided with angular velocity sensors 51 and 52 which function as blur detecting means for detecting the blur of the photographing optical system 2 with respect to the subject.

The angular velocity sensor 51 detects the angular velocity of the rotational movement of the camera in the vertical direction (vertical direction) of FIG. 1, and outputs to the control means 30 a voltage corresponding to the angular velocity in that direction due to camera shake or the like. The angular velocity sensor 52 is shown in FIG.
The sensor that detects the angular velocity of the rotational movement of the camera in the direction (horizontal direction) perpendicular to the paper surface of FIG. 2 outputs a voltage according to the detected angular velocity to the control means 30.

The image blur correction means 40 comprises a correction optical system 41 for deflecting the optical axis of the photographing optical system 2 and a drive means 42 for driving the correction optical system. The drive means 42 is
Based on a command from the control means 30, the correction optical system 41 is driven so as to cancel the movement of the subject image formed by the photographing optical system 2 on the film surface F.

Further, the control means 30 has the following functions. The first is a function as a setting unit that sets the aperture value Av and the shutter speed value Tv based on the exposure value set based on the photometric value, the film sensitivity, and the like. In the so-called program mode, these values are calculated by the control circuit of the camera, and in the so-called auto mode, the other is calculated by manually setting one of them.

Second, when the detected blur amount exceeds a predetermined limit value during exposure with set Av and Tv, the amount of light reaching the image pickup surface until the blur amount falls below the limit value. This is a function as a light shielding control means for setting the diaphragm to the maximum diaphragm value Avmax that minimizes the aperture diameter so as to reduce

Third, as a changing means for shifting the shutter speed set by the setting means to a low speed side or for shifting the set aperture value to an open side so as to compensate the exposure amount lowered by the action of the light shielding means. It is a function.

FIG. 2 is a block diagram for explaining input / output signals of the CPU 31 which constitutes the control means 30 described above.
The ON / OFF information of the metering switch 21 and the release switch 22 which are linked to the shutter button 20 is represented by a 1-bit digital pulse of the port PI1 of the CPU 31,
Input to PI2. The voltage outputs of the angular velocity sensors 51 and 52 are input to the A / D conversion ports AD1 and AD2 of the CPU 31.

Lens position sensors 428 and 43 for detecting the position of the correction lens are provided at the A / D conversion ports AD3 and AD4.
The voltage output from 8 is input.

CPU 31 D / A output ports DA1, D
A2 includes motors 425 and 435 for driving the correction optical system.
Are connected via motor drive circuits 461 and 462, respectively. The CPU 31 converts the movement amount of the correction lens required for correcting the image blur based on the above-mentioned input signal into the driving amount of the motors 425 and 435 for calculation, and corresponds to the driving amount from the ports DA1 and DA2. Output voltage.

A diaphragm drive unit 5a for driving the diaphragm 5 and a shutter drive unit 6a for controlling the shutter 6 are connected to the D / A output ports DA3, DA4, respectively.
These are controlled based on the calculation result in the CPU 31.

Next, the operation of the single-lens reflex camera having the above-described image blur correction function will be described with reference to a flow chart of two examples. In the example of FIG. 3, when the shake amount exceeds the maximum value that can be corrected, the exposure amount is suppressed by narrowing the diaphragm as the light shielding unit, and the insufficient exposure amount due to the action of the light shielding unit is set to the low shutter speed side. To compensate, that is, by extending the exposure time. On the other hand, in the example of FIG. 4, the insufficient exposure amount due to the action of the light blocking means is compensated by shifting the aperture to the open side from the initially set aperture value Av, that is, by widening the aperture of the aperture from the initial setting. .

When the diaphragm of a single-lens reflex camera is used as the light-shielding means, the diaphragm generally cannot completely block the light flux, so that the maximum aperture value Av that minimizes the aperture diameter of the diaphragm.
Even if the diaphragm is set according to max, a part of the light flux reaches the film F. Therefore, it is necessary to determine the total exposure amount by converting the exposure amount during the time when the light shielding unit is functioning.

In FIG. 3, when the power is turned on and the control is started, the counter TT that counts the operating time of the light shielding means and the flag S that is set when the operating time exceeds the time limit are cleared. (S1).

The amount of blur is detected based on the signal from the angular velocity sensor, and the amount of movement of the correction lens for canceling the movement of the image due to this blur is calculated (S2).
Next, it is checked whether the photometric switch is on (S3), and if it is off, the process of S2 is repeatedly executed.

When the photometric switch is turned on, the exposure calculation is executed, and the shutter time value Tv and the aperture value Av are obtained based on the photometric data, film sensitivity, etc. (S4). In the so-called program mode, all of these values are calculated by the control circuit of the camera, and in the so-called auto mode, the other is calculated by manually setting one of them.

In S5, the state of the release switch is judged, and while it is off, the process returns to S2 and the process is repeated. When the release switch is turned on, the set aperture value Av and the maximum aperture value Avmax when the aperture diameter of the aperture is minimized
The difference ΔAv from the difference is obtained (S6). This difference ΔAv is used as a coefficient for extending the exposure time in view of the fact that the exposure amount that is insufficient per unit time when the diaphragm is maximally narrowed differs depending on the set diaphragm value Av.

Then, the diaphragm is narrowed down to a predetermined aperture value, the quick return mirror 3 rises, and the shutter 6
And the exposure is started (S7). During exposure,
The shake amount detection and calculation (S8), and the correction lens drive (S9) are repeatedly executed until the exposure time ends.

In this example, even when the calculated driving amount exceeds the maximum value that can be corrected, the correction lens is driven based on this driving amount. However, when the drive amount exceeds the maximum value, the correction lens is driven to a position where the correction amount is maximum and stops. For stopping the correction lens at the maximum correction amount position, a mechanical limiter having a mechanism that defines the drive range of the correction lens may be used, or an electric limiter may be applied to the drive signal. .

The operating time of the light shielding means does not exceed the maximum value, the flag S is judged to be 0 (S10), and the aperture value Av obtained by the calculation is smaller than the maximum aperture value Avmax,
Therefore, if it is determined that ΔAv is greater than 0,
In (S11), the light-shielding means is controlled according to the amount of blurring in the following steps S12-18.

First, it is determined whether or not the blur amount is larger than the maximum value that can be corrected (S12). When it is larger than the maximum value, the light-shielding means is operated to set the diaphragm to the maximum diaphragm value Avmax to narrow down the diaphragm to the maximum. Subsequently, the counter TT for the timer that regulates the operating time of the light shielding time is incremented (S14), and it is checked whether the counter value exceeds the maximum value TTmax (S15).

If the value of the counter TT is less than or equal to the maximum value, it is determined whether or not the exposure time has ended with the diaphragm set to the maximum diaphragm value Avmax (S19). Counter TT
When the value of exceeds the maximum value, the exposure amount control by the light shielding means is abandoned, the aperture is returned to the initial value calculated by S4 (S16), and the flag S is set to 1 (S17). ).

If it is determined in S12 that the amount of blur is less than or equal to the maximum value, the aperture is set to the value Av obtained in S4 (S18), and it is determined in S19 whether the exposure time has ended. If it is determined in S12 that the shake amount is less than or equal to the maximum value because the light-shielding means is not operating, the aperture value is not changed in S18. On the other hand, when it is determined that the amount of blurring has become less than or equal to the maximum value during the operation of the light blocking means, the aperture value is returned from Avmax to Av before the operation in S18.

When the operating time of the light shielding means exceeds the maximum value and the flag S is set to 1 (S10), or the aperture value Av obtained by the calculation is smaller than the maximum aperture value Avmax and ΔAv is 0 or less. If it is determined (S11), it is not necessary to operate the light shielding means, and therefore, steps S12-
The processing of 18 is skipped.

The processes of S8 to 19 are repeatedly executed until it is determined in S19 that the exposure time has ended. When it is determined that the exposure time has ended, it is determined in S20 whether the counter TT is 0 or less. When the counter TT is 0, that is, when the light shielding means does not operate or the shortage of exposure due to the operation of the light shielding means is already compensated for by the extension of the exposure time (S20), the rear curtain of the shutter is moved, Down the quick return mirror 3,
The aperture is returned to the open position and the exposure is completed (S21).

When it is determined that the counter TT is not 0, that is, when the shortage of exposure amount is not compensated by the action of the light shielding means, the value of the counter is decremented by a predetermined ratio (S22). The function f (ΔAv) used in step 22 is a function having a correlation that becomes smaller as the difference ΔAv between the value Av obtained by calculation and the maximum aperture value Avmax becomes larger.

That is, when the difference ΔAv is relatively large,
Since the ratio of the insufficient exposure amount increases due to the action of the light shielding unit, it is necessary to extend the exposure time relatively long. On the other hand, when the difference ΔAv is relatively small, the proportion of the exposure amount that is insufficient due to the action of the light shielding means is relatively small, so that the extension of the exposure time is also relatively short. Therefore, when the difference is large, the value of f (ΔAv) is decreased to decrease the decrement amount of the counter TT when step 22 is executed once, and the time until the counter TT becomes 0 is set to be long. To do. If the difference is small, f
By increasing the value of (ΔAv), the time until the counter TT becomes 0 is set shorter.

According to the above control, the exposure amount reduced by the action of the light shielding means is compensated by extending the exposure time, and the action time is limited by the upper limit TTmax of the counter TT, so that the shutter time is indefinite. Can be prevented from being extended. The maximum value TTmax of the extension time may be set as a function of the set shutter speed value Tv.

In FIG. 4, the aperture value after the action of the light shielding means is made smaller than that before the action (the aperture diameter of the aperture is increased).
By doing so, an example of compensating for the underexposure during the period when the blur correction exceeds the maximum limit and is the maximum aperture is shown. In this example,
Although the control is performed so as not to change the time determined by the shutter speed value Tv obtained by the calculation, the exposure amount may be compensated by using the change of the aperture diameter and the change of the shutter time together. Good.

Steps S101 to 105 and S106-1
08 is the same as S1-5 and S7-9 in FIG. By turning on both the metering switch and the release switch,
Exposure starts, the amount of blurring is detected at the same time, and the correction lens is driven as necessary.

It is determined by the flag S whether or not the control by the light shielding means is continued (S109). When it is determined that the control is continued when the flag S is 0 and the aperture value Av calculated by S104 is smaller than the maximum aperture value Avmax (S110), the blur amount exceeds the maximum value that can be corrected. It is determined whether or not (S111).

When it is determined that the maximum aperture value is exceeded, the light-shielding means operates to set the aperture to the maximum aperture value Avmax (S
112), the counter TT for measuring this action time is incremented (S113).

Then, the exposure time before the action of the light shielding means,
The remaining time is calculated by subtracting the exposure time after the light-shielding means has been actuated from the shutter time determined by the shutter speed value Tv, and an appropriate aperture value is obtained by recalculation to obtain a predetermined exposure (S114). ). In the flowchart, this recalculation is executed every time the counter advances by one step, but it may be executed every time the counter advances by a plurality of steps.

When the recalculated aperture value Av is less than or equal to the minimum aperture value Avmin (S115), the aperture is set according to the minimum aperture value Avmin (S116), and the flag S is set to 1.
(S117). If the recalculated aperture value Av becomes equal to or smaller than the minimum aperture value Avmin, the required exposure amount cannot be secured even if the aperture is opened to the maximum within the remaining time of the set shutter time. Give priority to time and abandon the control by the light shielding means. The flag S is set to 1 when this control is abandoned, and thereafter, the determination of the shake amount is skipped (S109).

The recalculated aperture value Av is the minimum aperture value Av.
If it is larger than min, the exposure amount can be compensated for within the remaining time of the set shutter time, so steps S116 and S117 are skipped.

If it is determined in step S111 that the shake amount does not exceed the maximum value that can be corrected, the aperture is set to Av (S118) and the counter TT is cleared (S119). If the shading amount is judged to be less than the maximum value in S111 because the light shielding means is not working at all, S1
At 18, the aperture value remains the value obtained in S104. On the other hand, if it is determined that the blurring amount has become less than or equal to the maximum value during the operation of the light blocking means, the aperture value is set to A at S118.
The value vmax is changed to the value recalculated in S114.

The processes of S107 to 119 are repeatedly executed until it is determined in S120 that the exposure time has ended.
When it is determined that the exposure time has expired, the rear curtain of the shutter is caused to run in S121, and the quick return mirror 3
Down to close the aperture and end exposure.

In the above case, if it is desired to give priority to the shake correction over the shutter time, a part of the shutter time changing program shown in FIG. 3 is used to reduce the shutter speed value (shutter opening time It may be reset).

In the examples of FIGS. 3 and 4, when the diaphragm is made to function as the light-shielding means, control is performed so that the maximum diaphragm value Avmax is set regardless of the initially set diaphragm value Av. However, since the function as the light-shielding means is achieved when the exposure amount in the period in which the blur amount exceeds the correctable range becomes relatively small, it becomes larger than at least the aperture value Av set at the start of photographing (aperture value). (Aperture becomes smaller)
If the direction is changed, the purpose will be achieved. For example, based on the initially set aperture value Av, a fixed value may be added to the aperture value Av to reduce the exposure amount.

[0048]

Second Embodiment FIGS. 5 to 7 show a second embodiment of the present invention. In this example, the invention is applied to the lens shutter camera 1a and a lens shutter is used as a light shielding means. Unlike the diaphragm of the single-lens reflex camera described above, the lens shutter can completely block the light flux reaching the film, so that the exposure amount during the operation of the light shielding means is 0.
Becomes

As shown in FIG. 5, the lens shutter camera 1a includes an image pickup optical system 2 and a finder system 4 which are independently provided, and an image blur correction unit 40 having a correction lens 41 and a drive unit 42. Angular velocity sensors 51, 52, shutter button 20, control means 30,
The film surface F and the like are arranged similarly to the camera shown in FIG. A lens shutter 50 is provided between the photographing optical system 2 and the image blur correction unit 40. The connection relationship between the control circuit 30 and each member is almost the same as in the example shown in FIG.

Next, two examples of the control of the second embodiment will be described with reference to the flowchart. FIG. 6 shows an example in which the exposure amount is compensated by extending the shutter time when the light-blocking means operates when the blur amount exceeds the maximum value that can be corrected.
FIG. 7 shows an example in which the aperture is changed to the open side for compensation.

In the example of FIG. 6, after the flag S and the counter TT are cleared (S201), the blur amount is detected and the correction amount is calculated (S20).
2) and exposure calculation (S204) are repeated until both the photometric switch and the release switch are turned on (S203, 204).

When the release switch is turned on, the lens shutter 50 which has been completely closed is opened based on the aperture value Av calculated in S204 (S206), the amount of blurring is detected and the amount of correction is calculated (S207), Then, the correction lens is driven based on the correction amount (S208).

When the flag S is 0, it is determined that the control by the light-shielding means is continuing (S209), and it is determined that the blur amount exceeds the maximum value that can be corrected (S2).
In 10), the lens shutter 50 that has been opened due to the light blocking means is completely closed (S211), and the counter TT is incremented to measure the time during which the light blocking means is operating (S212).

When the counter TT exceeds the maximum value TTmax corresponding to the action limit time of the light shielding means (S213), the action of the light shielding means is abandoned and the lens shutter 50 is set to the aperture value Av before the light shielding means is controlled. (S214), the flag S is set to 1 and the action of the light shielding means is abandoned.
(S215), it is determined whether the exposure time has elapsed (S21).
6). When the value of the counter TT is less than or equal to the maximum value TTmax, S214 and 215 are skipped in order to continue the operation of the light shielding means.

If it is determined in S210 that the amount of blur is less than or equal to the maximum value, the lens shutter 50 causes S20 to
The value obtained in 4 is set (S217). The steps from S207 to 217 are repeatedly executed until the exposure time corresponding to the shutter speed set in S204 ends, and when the exposure time ends, it is determined that the counter value has become 0 (S218) decrement The same is repeated while performing (S219).

Since the subject light is completely blocked when the light-shielding means operates, the operating time of the light-shielding means for incrementing the counter TT and the time extended by decrementing the counter are set to be equal. Counter TT is 0
When the extension time ends, the lens shutter is closed (S220) and the process ends.

In the example of FIG. 7, the aperture value after the action of the light shielding means is made smaller than that before the action (the aperture diameter of the aperture is made larger), so that the blur correction exceeds the limit and becomes the maximum aperture. To compensate for underexposure during a certain period.

Steps S301 to S310 are S2 of FIG.
It is the same as 01-210. When both the photometry switch and the release switch are turned on, exposure starts, and at the same time, the amount of blur is detected, and the correction lens is driven as necessary.

It is determined that the flag S is 0 (S309), and
When it is determined that the shake amount exceeds the maximum value that can be corrected (S310), the light blocking means operates to completely close the lens shutter 50 (S311), and a counter for measuring this operation time is obtained. TT is incremented (S31
2).

Then, the exposure time before the action of the light shielding means,
The exposure time after the light-shielding means has acted is subtracted from the shutter time determined by the shutter speed value Tv to calculate the remaining time, and an appropriate aperture value is obtained by recalculation to obtain a predetermined exposure (S313). ).

When the recalculated aperture value Av becomes equal to or smaller than the minimum aperture value Avmin (S314), the aperture is set according to the minimum aperture value Avmin (S315), and the flag S is set to 1
(S316). When the recalculated aperture value Av becomes equal to or smaller than the minimum aperture value Avmin, the control by the light shielding means is abandoned, and thereafter, the determination of the blur amount is skipped (S309).

The recalculated aperture value Av is the minimum aperture value Av.
If it is larger than min, steps S315 and S316 are skipped.

If it is determined in step S310 that the shake amount does not exceed the maximum value that can be corrected, the aperture is set to Av (S317) and the counter TT is cleared (S318). If it is determined in S310 that the amount of blur is less than or equal to the maximum value because the light blocking means is not working at all, S3
In 17, the aperture value remains the value obtained in S304 and remains unchanged. On the other hand, if it is determined that the amount of blurring is less than or equal to the maximum value during the operation of the light blocking unit, the aperture value is set to A at S317.
It is changed from vmax to the value recalculated in S313.

The processes of S307 to 319 are repeatedly executed until it is determined in S319 that the exposure time has ended.
If it is determined that the exposure time has ended, the shutter is closed in S320 and the exposure ends.

In the above case, when it is desired to give priority to the shake correction over the shutter time, a part of the shutter time changing program shown in FIG. 6 is used to reduce the shutter speed value (shutter opening time It may be reset).

[0066]

As described above, according to the present invention, when the amount of blur exceeds the maximum value that can be corrected, the shading means is actuated to reduce at least the amount of light reaching the image plane. Suppresses the amount of exposure while
The exposure amount can be compensated when the blur amount can be corrected. Therefore, even if the amount of blurring is relatively large, it is possible to take a photograph that is not affected by blurring, and there is no underexposure.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a single-lens reflex camera having an image blur correction function according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control system of the camera of the first embodiment.

FIG. 3 is a flowchart showing a first control sequence of the camera of the first embodiment.

FIG. 4 is a flowchart showing a second control sequence of the camera of the first embodiment.

FIG. 5 is a block diagram showing a schematic configuration of a lens shutter camera having an image blur correction function according to a second embodiment of the present invention.

FIG. 6 is a flowchart showing a first control sequence of the camera of the second embodiment.

FIG. 7 is a flowchart showing a second control sequence of the camera of the second embodiment.

[Explanation of symbols]

 1 Single-lens reflex camera 1a Lens shutter camera 2 Photographing optical system 4 Viewfinder optical system 5 Aperture 20 Shutter button 21 Photometric switch 22 Release switch 30 Control means 31 CPU 40 Image blur correction means 50 Lens shutter 51, 52 Angular velocity sensor

Claims (6)

[Claims] 1. A photographing optical system for forming a subject image on an image receiving surface, a blur detecting means for detecting blur of the photographing optical system with respect to a subject, and the image receiving surface on the basis of a signal from the blur detecting means. Image blur correction means for canceling the movement of the subject image at, the light blocking means provided in the photographing optical system for blocking at least a part of the light flux reaching the image receiving surface, and the aperture based on the set exposure value. Setting means for setting the value and shutter speed, and reducing the amount of light reaching the imaging surface when the detected blur amount exceeds a predetermined reference value during exposure with the value set by the setting means. And a shutter speed that is set by the setting unit so as to compensate the exposure amount reduced by the action of the light blocking unit when the light blocking control unit operates. And a camera having an image blur correction function and having a changing means for changing at least one. 2. The light-shielding control means controls the light-shielding means so as to reduce the amount of light reaching the imaging surface when the detected blur amount exceeds a range that can be corrected by the blur correction means. A camera having an image blur correction function according to claim 1. 3. A camera having an image blur correction function according to claim 1, wherein the changing means shifts the shutter speed to a lower speed side. 4. A camera having an image blur correction function according to claim 1, wherein the changing means shifts the aperture value to the open side. 5. The image blur correction function according to claim 1, wherein the light blocking means is a lens shutter provided in the photographing optical system and blocking all light flux reaching the image receiving surface. Camera with. 6. The image blur correction according to claim 1, wherein the light shielding control means stops the operation of the light shielding means when the operation time of the light shielding means exceeds a predetermined time limit. A camera with functions.