JPH07295002A - Vibration-proof camera - Google Patents

Abstract

PURPOSE:To execute photographing on the same photographing condition regardless of the sensitivity of film by constituting so that a flashing control means controls the light emission of a flashing means based on the detected result by a luminance detection means regardless of the operation of an image blurring correction means. CONSTITUTION:A camera control part 1 is provided with a ROM part and a RAM part as a storage part, and controls a flashing part 5, an exposure adjusting part 7 and an image blurring correction driving part 8 based on the detected result by a range-finding part 2, a luminance detection part 3 and a shake detection part 9, and the state of respective switches. The detection part 3 detects the luminance of a subject, and outputs the detected result to the control part 1. The control part 1 decides the light emission/non light emission of the flashing part 5 at the time of photographing. The decision is executed based on the luminance value of the subject. Namely, the decision of the light emission/ non light emission of the flashing part 5 at the time of photographing is executed based on the luminance of the subject without receiving the effect of the sensitivity of the film used for photographing or the condition of the actuation/non actuation of the image blurring correcting function at the time of photographing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration camera suitable for monitoring an anti-vibration camera having a built-in flash, and more particularly to a camera having a flash light emission function and an anti-vibration device for preventing image blur due to camera shake. .

[0002]

2. Description of the Related Art A camera having a function of moving an anti-shake optical system (hereinafter referred to as an anti-shake device) so as to prevent image shake on an image plane when camera shake occurs is known. A description of a camera provided with this shake prevention device and further having a flash light emission function is given in Japanese Patent Laid-Open No. 2-1.
16835.

[0003]

However, Japanese Unexamined Patent Application Publication No.
In the camera described in Japanese Patent No. 116835, the shutter speed is set differently depending on the film sensitivity used for shooting. Therefore, even if the shooting brightness condition is the same, the flash light emission is performed based on the shutter speed calculated by photometry and the camera shake condition. There was a case of doing and a case of not doing.

For this reason, when shooting is performed using films having different film sensitivities, there may be cases where flash light emission is carried out even under the same shooting conditions, and photographs of different images are completed depending on the film sensitivity. There was a problem that it would end up. Further, when the normal subject light has a low brightness, the normal subject is often illuminated by artificial light, and when the normal shooting is performed under this condition, the color reproducibility of the taken photograph is not good. There was a point.

Therefore, in the present invention, it is possible to shoot under the same shooting conditions regardless of the sensitivity of the film, and further, depending on the shooting conditions, the frequency of occurrence of photographs with poor color reproducibility is reduced, and good shooting is possible. The purpose is to provide a camera.

[0006]

In order to solve the above problems, in the image stabilizing camera according to claim 1, a shake detecting means for detecting shake of the camera and a result of detection by the shake detecting means are provided. In a vibration-proof camera including image blur correction means for performing image blur correction of the camera, brightness detection means for detecting subject brightness, and flashing means for emitting auxiliary light at the time of shooting, the detection result of the brightness detection means Based on the above, a flash control means for controlling the flash means is provided.

In the image stabilizing camera according to claim 2, further, a distance measuring means for measuring a subject distance at the time of photographing, a film sensitivity detecting means for detecting sensitivity information of a photographic film, the brightness detecting means and the film. And a photometry calculation means for calculating the exposure time at the time of shooting based on the detection result of the sensitivity detection means, and when the distance measurement result of the distance measurement means is smaller than a predetermined distance, the flash control means The flashing means is controlled based on the detection result of the brightness detecting means and the calculation result of the photometric calculating means.

According to another aspect of the present invention, there is provided the image stabilizing camera according to the first aspect.
In the anti-vibration camera described above, further, photometry for calculating an exposure time at the time of shooting based on a film sensitivity detecting means for detecting sensitivity information of a photographic film, and a detection result of the brightness detecting means and the film sensitivity detecting means. A calculation unit and an image blur correction unit that controls whether or not to activate the image blur correction unit during shooting based on the exposure time calculated by the photometric calculation unit are provided.

According to another aspect of the invention, there is provided the image stabilizing camera according to the first aspect.
In the anti-vibration camera described above, further, photometry for calculating an exposure time at the time of shooting based on a film sensitivity detecting means for detecting sensitivity information of a photographic film, and a detection result of the brightness detecting means and the film sensitivity detecting means. An arithmetic unit, and an image blur correction control unit for controlling whether or not to activate the image blur correction unit at the time of photographing based on the detection result of the blur detection unit and the arithmetic result of the photometric calculation unit are provided. .

In the image stabilizing camera according to the present invention, there is provided a selecting means capable of selecting the operation / non-operation of the image blur correcting means according to the selection of the photographer. According to a sixth aspect of the present invention, in the anti-vibration camera, the film sensitivity detecting means includes an electrical contact for detecting film sensitivity information from the film container.

[0011]

In the image stabilizing camera according to the present invention, the flash control means controls the light emission of the flash means on the basis of the detection result of the brightness detection means regardless of the operation of the image blur correction means. In that case, the conditions of light emission / non-light emission of the flash device can be made the same regardless of the film sensitivity, so that the same image can be taken.

Further, by setting the light emission / non-light emission switching condition of the flash device near a difference (estimated condition) between a natural light photographing condition and an artificial light photographing condition (estimated condition), the artificial light photographing condition can be changed. The color reproducibility of can be improved. According to another aspect of the present invention, in the anti-vibration camera, when the photographing distance is shorter than a predetermined distance as a result of distance measurement by the distance measuring means, the flash control means is based on the detection result of the brightness detecting means and the calculation result of the photometric calculating means. Since the flashing means is controlled, it is possible to take a photograph without the influence of image blur.

According to a third aspect of the present invention, in the image stabilizing camera, the image blur correction control means operates the image blur correction means based on the exposure time calculated by the photometric calculation means, and the flash light control means detects the detection result of the brightness detection means. Since the light emission (non-light emission) of the flash unit is controlled based on the above, it is possible to take a photograph without the influence of image blur. In the image stabilizing camera according to claim 4, the image blur correction control means activates the image blur correction means at the time of photographing based on the detection result of the shake detection means and the calculation result of the photometric calculation means, and the flash control means, Since the light emission (non-light emission) of the flash means is controlled based on the detection result of the brightness detection means,
It is possible to take pictures that are not affected by image blur.

In the anti-vibration camera according to the fifth aspect, the photographer can select the operation / non-operation of the image blur correction means, so that the photograph can be taken according to the photographer's preference. The anti-vibration camera according to claim 6 detects the film sensitivity by using an electrical contact.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram of an anti-vibration camera with a built-in flash that represents an embodiment of the present invention. In FIG.
The camera control unit 1 has a ROM unit and a RAM unit as a storage unit, and will be described later based on the detection results of the distance measuring unit 2, the brightness detection unit 3, and the shake detection unit 9 described below and the states of the switches. The flash unit 5, the focusing unit 6, the exposure adjustment unit 7, and the image blur correction drive unit 8 are controlled.

The distance measuring unit 2 detects the photographing distance to the subject and outputs the detection result to the camera control unit 1. In the present embodiment, the distance measuring unit 2 projects light onto an object using an IRED (infrared light emitting diode),
This is a type in which reflected light is received by a (silicon photodiode) and the distance is measured based on the received light state.

The brightness detecting section 3 detects the brightness of the subject,
The detection result is output to the camera control unit 1.
As an element for detecting the brightness, there are a photoelectric conversion element such as SPD and GPD (gallium arsenide diode) combined with a condenser lens, and a photoresistive element such as CdS.
In the present embodiment, the brightness detection unit 3 uses an SPD combined with a condenser lens.

The release switch 4 is a half-push switch 4
It is composed of a and a full-press switch 4b, and outputs the output to the camera controller 1. Flash part 5
Is for irradiating a subject with auxiliary light at the time of shooting.
The focusing unit 6 (usually called a “strobe device” having a xenon arc tube or the like) is a camera control unit 1 based on the distance measurement of the distance measurement unit 2.
The focus state of the photographing optical system (not shown) is adjusted by the control of.

The exposure control unit 7 controls the exposure illuminance and exposure time of the camera of this embodiment. The image blur correction drive unit 8
In order to correct the image blur, an image blur correction optical system (not shown) is driven. As the configuration of the driving unit, there are ones that use the rotation of a feed screw by a motor, the linear movement of a coil called a voice coil, and the electromagnetic force using a winding coil.
In this embodiment, the image blur correction driving unit 8 is driven by the rotation of the feed screw driven by the motor.

The shake detection unit 9 detects a shake applied to the camera and outputs the detection result to the camera control unit 1. In the present embodiment, the shake detection unit 9 uses an angular angle sensor called a vibration type gyro. Figure 9
FIG. 2 is a diagram showing details of the film sensitivity setting unit 10 in FIG. 1. The film sensitivity setting unit 10 detects the sensitivity of the film by the electrical contact of the pattern of the electrically conductive portion set in the film container used for photographing (so-called D).
X contact).

Returning to FIG. 1, the correction mode setting unit 11
The photographer can set the operation / non-operation of the image blur correction driving unit 8 at the time of shooting by operating a switch or the like on the main portion, and outputs a signal according to the setting to the camera control unit 1. Figure 2
It is a flowchart of the camera control unit 1. The operation of the anti-vibration camera with a built-in flash according to the present embodiment will be described below with reference to this flowchart.

When the camera power source is turned on by the camera start switch (not shown), the camera control section 1 starts this flowchart from "start". The camera control unit 1 determines whether the half-push switch 4a (hereinafter abbreviated as S1) is ON (step 10). Camera control unit 1
If the determination result is YES, the process proceeds to step 20, and if the determination result is NO, step 10 is repeated until the determination result becomes YES.

Further, when proceeding from S10 to S20, the camera control section 1 commands the distance measuring section 2, the brightness detection section 3 and the shake detection section 9 to perform respective detection operations. The camera control unit 1 inputs the brightness information (BV value information) output by the brightness detection unit 3 (step 20). The camera control unit 1
The film sensitivity information is input from the film sensitivity setting unit 10 (step 30).

The camera control section 1 inputs focal length information of a photographing optical system (not shown) (step 40). This may be an electric signal from a lens zoom position detector (not shown) (brush + pattern for detecting zoom position) or may be input of zoom conditions set by the photographer by operating a zoom adjusting member (not shown). (In this case, the camera control unit 1 controls the photographing optical system to perform a zoom drive by controlling a zoom drive unit (not shown) according to the above operation.) The camera control unit 1 outputs the distance measuring unit 2. The photographing distance information is input (step 50).

The camera control unit 1 controls the focusing unit 6 to drive the focusing in accordance with the above-mentioned photographing distance (step 6).
0). The camera control unit 1 determines whether to perform image blur correction driving via the correction mode setting unit 11 (step 70). If the determination result is YES, the camera control section 1 proceeds to step 80, and if the determination result is NO, proceeds to step 90.

The camera control section 1 stores the correction flag signal for determining the operation / non-operation of the image blur correction drive during photographing as "1" in the storage section (step 80). When the determination result of step 70 is NO, the camera control section 1 stores the above-mentioned correction flag signal as "0" in the storage section (step 90). The camera control unit 1 determines whether the flash unit 5 emits light or not (step 100).

The determination made in step 100 is "determination mode I", and the determination is made based on the brightness value (BV value) of the subject obtained in step 20. In the "determination mode I", the brightness (BV value) of the subject is used as the determination criterion for the flash emission / non-emission for the following reason. -Most cameras have a program AE (AE that uniquely determines the aperture and exposure time for the "EV value" used in the apex calculation method) mode today, and it is possible to shoot in this mode. Many.

In the program AE mode, the exposure time differs depending on the film sensitivity used at the time of shooting even if the subject brightness is the same.・ Low-sensitivity film gives long exposure, and high-sensitivity film gives short exposure. -Even if the subject brightness is the same, when using a low-sensitivity film, the image blur due to camera shake may become noticeable.

Therefore, in a conventional camera having no image blur correction function, when the exposure time is likely to be longer than a predetermined time (considering the focal length condition of the photographing optical system), the flash is emitted. It may be better to shift to "flash mode" to shorten the exposure time.・ However, if the exposure time is used as the criterion for flash firing / non-flash firing, even if the subject brightness is the same, depending on the sensitivity of the film used, “Flash non-flash program AE
"Mode shooting" and "flash mode shooting with flash emission" occur.

Even if the subject brightness is the same, the impression of the photographed picture may be quite different due to the difference in film sensitivity. In particular, it can be remarkable in the case of a photograph in which a background other than the main subject is also shown. When you compare them later, there is a risk that the appearance of the photos may be uneven. In the case of a camera such as the present invention having an image blur correction function, the risk of image blur during long-time exposure is greatly reduced.

Therefore, it is possible to set the flash emission determination standard at the time of photographing to a relatively low brightness even when a low-sensitivity film is used. -Because the brightness can be set to a relatively low level, the frequency of flash emission will also decrease and it will be effective for energy saving. -When using high-sensitivity film, the subject is exposed to light for a short time even if it has a very low brightness, so you can shoot without flashing without worrying about image blur.

However, when it is expected that the photographing condition is an illumination condition by artificial light, the color temperature of the light source is set to be suitable for photographing, from the viewpoint of color reproducibility of the photograph. It is better to use a flash. Therefore, it is better to use the subject brightness, which allows the user to grasp the shooting situation, as the flash emission determination standard during shooting.

By the above, the impression of the photograph becomes constant regardless of the film, and the image blur can be removed by the image blur correction function, so that a beautiful photograph having a good appearance can be obtained. In step 100, the light emission / non-light emission of the flash unit 5 at the time of photographing is determined according to the subject brightness in the "determination mode I" for the reason described above.

The camera controller 1 determines NO when the brightness is higher than the predetermined brightness and proceeds to step 110, and when the brightness of the subject is not higher than the predetermined brightness, determines YES and proceeds to step 120. As the predetermined brightness, a value may be set as follows, for example.・ Today, many cameras are equipped with zoom lenses as photographic lenses, but the ones that change the open F number depending on the focal length setting are the mainstream. The longer the focal length, the larger the open F-number (darker).

The image blur is approximately proportional to the focal length with respect to the blur applied to the camera. The longer the focal length, the more noticeable the image blur. -It is said that the exposure time when the image blur becomes noticeable is about 1 second, which is equal to the focal length.・ Therefore, the maximum focal length of the zoom lens (for example, 125
mm) condition, the exposure time should be equal to or less than 1/125 second (TV7).

Open F at the maximum focal length of the zoom lens
If the number is F8 (AV6), for example, there is a risk of image blur in this camera because of the EV13 condition. -Currently, the film sensitivity used for shooting is ISO100
Is about ISO400 (SV5 to SV7).

If, for example, an SV5 film is used, the image blurring dangerous exposure time is obtained when the subject brightness = BV8. Actually, the effect of the image blur correction function can be expected, so if the effect can be extended by an exposure time of about 2 to 3 TV, the brightness of the subject = BV6 to 5 or the brightness to judge BV7 to 6 in consideration of safety. It is good to (Of course, the reference varies depending on the performance of the image blur correction function.) Also, the subject brightness = BV8 to 7 may be determined as the brightness. (This value is a value that hardly considers the effect of image blur reduction by the image blur correction function.) Alternatively, BV9 to 8 may be set in consideration of safety.

Further, for example, in recent years when SV7 film has become mainstream, subject brightness = BV4 to 3 or BV
It may be about 5 to 4. Alternatively, it may be a predetermined brightness condition that is determined in advance by a shooting experiment or the like and that can obtain a good shooting result, regardless of the above-described condition of image blurring. The above is the flash emission / non-emission determination reference value examined from the viewpoint of image blur correction, but from another perspective, it is also necessary to consider the determination reference whether the shooting light is natural light or artificial light. .

This value needs to take into consideration the relationship between the photographing area of the camera and the photometric area. However, in the case of a camera that measures light within the photographing screen, it is experimentally near BV6,
It is better to use BV8-4 as the criterion. Since this value is close to the value of the other criterion obtained above, there is no inconvenience to adopt.

FIG. 8 shows an example of a program curve in the program AE mode. as mentioned above,
For example, when BV6 is used as the flash emission / non-emission determination standard, when shooting is performed with an SV5 film (ISO100 film), flash emission / non-emission is switched under the EV11 condition.

Further, when photographing is performed with an SV7 film (ISO400 film), flash emission / non-emission is switched under the EV13 condition. Also,
As shown in the figure, when the program curve changes due to the change of the focal length of the zoom lens (the open F number often becomes small (bright) when the focal length is short, so it often changes). However, as described above, flash emission / non-emission is switched at a constant BV value.

Returning to the flowchart of FIG. 2, when the determination in step 100 is NO, the camera control unit 1 sets the above-mentioned light emission flag to "0" and proceeds to step 140 (step 110). When the determination in step 100 is YES, the camera control unit 1 emits light from the flash unit 5 at the time of shooting /
The light emission flag signal for determining non-light emission is set to "1" and the process proceeds to step 130 (step 120).

The camera controller 1 determines whether or not the flash light reachable distance is sufficient to obtain proper exposure in the flash mode (step 130). The camera control unit 1 makes a determination based on the film sensitivity information, the focal length information, the shooting distance information, etc. input in step 30 to step 50. That is, the camera control unit 1 determines that a proper shooting aperture value (shooting F number) determined by the guide number and shooting distance conditions determined by the film sensitivity used for shooting and the light emission amount of the flash unit 5 is the focal length condition of the shooting optical system. If it is equal to or smaller than the maximum aperture diameter (open F-number) determined by, the aperture is determined to be in the flash mode and it is determined in step 15
Go to 0.

If the above conditions are not satisfied, the camera control section 1 judges that the flash mode is impossible and the step 14
Go to 0. When it is determined in step 100 that the flash is not to be fired, step 140 is the same as step 130.
This is the step when it is determined that sufficient subject light cannot be obtained even if the flash is fired at.

The camera control unit 1 inputs the subject brightness information, the film sensitivity information, which are input in steps 20 to 40,
A normal AE calculation is performed based on the focal length information and the like, an appropriate photographing aperture value and exposure time are set, and information necessary for the exposure operation is stored (step 140). Camera control unit 1
Determines that flash photography is possible in step 130, so based on the film sensitivity information, focal length information, photography distance information, etc. input in steps 30 to 50, appropriate photography aperture value calculation and setting, flash mode The exposure time is set and the information necessary for the exposure operation is stored (step 150).

The camera control unit 1 has a half-push switch 4a.
It is determined whether or not the state of (S1) is ON. If it is ON, YES is determined and the process proceeds to step 170. If it is not ON, the half-pushed state is released by the photographer, so NO is selected and the process proceeds to step 180 (step 16).
0). The camera control unit 1 is, in turn, the full-press switch 4b.
It is determined whether the state (hereinafter abbreviated as S2) is ON (step 170).

If the camera control unit 1 is ON, the determination is YES, and step 190 in FIG. 3 (indicated by "A" in the figure).
Proceed to. If it is not ON, the judgment is repeated. When the determination in step 160 is NO, the camera control section 1 causes the focusing section 6 to perform the focusing drive reset for returning the focusing drive performed in step 60 to the initial state, and returns to step 10 (step 180).

Step 19 of the flowchart shown in FIG.
Below 0 is a continuation of the flowchart of FIG. 2 and explains a series of exposure operations. The camera control unit 1 determines whether the correction flag set in step 80 or step 90 is “1”. If "1", YES
If so, the process proceeds to step 200, and if “0”, the process proceeds to step 210 (step 190).

The camera control section 1 controls the drive of the image blur correction drive section 8 so as to correct the image blur caused by the camera shake based on the detection from the shake detection section 9, and starts the image blur correction operation. (Step 200). Camera control unit 1
When NO is determined in step 190, the image blur correction operation is not performed during the exposure. Therefore, the image blur correction drive unit 8 is caused to perform the reset operation, and the position of the correction optical system (not shown) is set to the image blur correction non-operation. The state most suitable for operation photographing is set (step 210).

The camera control unit 1 controls the drive of the exposure adjustment unit 7 to start the exposure in order to realize the photographing aperture value and the exposure time (step 220). The camera control unit 1
It is determined whether or not the light emission flag set in step 110 or step 120 is "1" (step 23).
0). If the light emission flag is “1”, the camera control unit 1 determines YES and proceeds to step 240, and if “0”, determines NO and proceeds to step 250.

The camera control section 1 controls the flash section 5 to emit auxiliary light during the exposure time (step 24).
0). The camera control unit 1 controls the drive of the exposure adjustment unit 7 after a predetermined time from step 220, and ends the exposure operation (step 250). The camera control unit 1 controls the driving of the image blur correction driving unit 8 and ends the image blur correction driving (step 260).

The camera control section 1 causes the image blur correction drive section 8 to perform a reset operation to bring the position of a correction optical system (not shown) into a state most suitable for the standby state (step 270).
Since this reset operation has a different purpose from the reset performed in step 210, the reset operation does not have to be the same operation. For example, the operation performed in step 210 is the operation of moving the correction optical system forming a part of the photographing optical system to the center of the drive range, and the operation performed in step 270 is the movement to the corner of the range. It may be a motion.

Of course, they may be the same (for example, both may be moved to the center), and if they are the same, step 270 may be omitted. Camera control unit 1
Causes the focusing unit 6 to reset the focusing drive after the exposure operation is completed. (Step 280) This operation is the same as the operation executed in step 180.

The camera control section 1 winds up the photographic film to cope with the next exposure operation, and then ends the series of photographic operations (step 290). As described above, the determination of whether the flash unit 5 emits light or not at the time of shooting is performed based on the brightness of the subject regardless of the sensitivity of the film used for shooting and the operating / non-operating conditions of the image blur correction function at the time of shooting. Since this is done, the impression of the photograph becomes constant with respect to the subject having the same brightness, and a beautiful photograph having a good appearance can be obtained.

In the case of a camera having an image blur correction function as in the example of the present invention, the image blur correction function is normally activated at the time of photographing. Image blurring can be avoided. Also, when deactivating the image stabilization function during shooting,
Since it is considered that the photographer has a certain intention or there is no risk of image blurring such as mounting a tripod, it is not necessary to change the flash emission criterion.

FIG. 4 is a flow chart for explaining the operation of another application example of the camera control section 1. This application example aims to strengthen the image blur prevention effect at a close range.
When the shooting distance is the shortest distance, it may be difficult to remove the image blur even in the camera having the image blur correction function for the following reason. -Since the shooting magnification of the subject becomes large, the image blur caused by the motion of the subject becomes noticeable.

When the angular velocity sensor as described above is used for shake detection, the parallel movement of the camera cannot be detected and the image shake caused by the parallel movement cannot be corrected. As the shooting magnification of the subject increases, it becomes more noticeable. In order to prevent image blur due to the above reason, not only activate the image blur correction function, but also shorten the exposure time,
Alternatively, it is effective to shift to the flash mode in which the image is dominant due to the light emission time which is considerably shorter than the exposure time.

An application example in consideration of these is the flowchart of FIG. In the flow chart of FIG. 4, steps 10 to 100 are the same as those of the flow chart of FIG. 2, so the description thereof will be omitted and the description will be continued from step 102. The camera control unit 1 determines whether or not the shooting distance is less than a predetermined short distance (RM) when the brightness condition is that the flash does not emit light during shooting (step 10).
2).

The camera control section 1 makes a YES determination at the time of short-distance shooting less than the distance RM and proceeds to step 105. If not, NO is determined and the process proceeds to step 110 as in the flowchart of FIG. Here, the distance RM may be set as follows, for example. Based on the assumption in the step 100 of the flow chart of FIG. 2, the longest focal length of the zoom lens (for example, 1
25 mm) conditions are the most severe.

When the taken image magnification is about 1/10, the image blur caused by the parallel movement of the camera cannot be ignored.・ In addition, at the time of shooting at a large shooting magnification, due to the depth of focus, we would like to shoot with the lens aperture stopped down considerably. (I want to shoot in a state where it is not open.) ・ If the aperture is narrowed down, it requires a long exposure time, which is disadvantageous for image blur.

In consideration of the above, further considering the light emitting ability of the flash section 5 (for example, GN.10 to 15 in ISO100), it is preferable to set RM = 1 to 1.5 m. If the light emission capability of the flash unit 5 is low, it may be about 0.7 m to 1 m. Alternatively, it may be a set value of a predetermined distance that is determined in advance by a shooting experiment or the like and that can obtain a good shooting result.

As a further application, the photographing magnification may be converted by using the photographing distance information and the focal length information, and the photographing magnification may be used as a criterion. Alternatively, considering the irradiation capability of the flash unit 5, both the above-mentioned shooting magnification and shooting distance may be used as the judgment criteria. Returning to the flowchart of FIG. 4, when the determination in step 102 is YES, the camera control unit 1 determines whether the flash unit 5 emits light or not (step 10
5).

The determination performed in this step is the "determination mode II" which is different from the previous step 100. here,
First, the normal AE calculation as described in step 140 of the flowchart of FIG. 2 is performed in advance. The camera control unit 1 obtains appropriate setting information of the photographing aperture value and the exposure time based on the subject brightness information, the film sensitivity information, the focal length information and the like input in steps 20 to 40.

Then, the camera control unit 1 compares the obtained proper exposure time with a predetermined criterion to determine whether or not to automatically shift to the flash mode, and when to shift to the flash mode (proper exposure time> The judgment reference exposure time) is followed by step 120. If not (appropriate exposure time ≦ determination reference exposure time), the process proceeds to step 110. By the above operation, it is possible to improve the situation in which it becomes difficult to remove the image blur even in a camera having an image blur correction function at a close range.

It should be noted that the uniformity of exposure may be sacrificed to prevent image blurring, but during close-up photography, a good photograph is often obtained if the main subject is properly exposed. The above operation is effective because it is often allowed even if the exposure condition of the background is slightly broken. Note that the flow chart after step 110 and step 120 is the same as the flow chart of FIG. 2 described above, so the description thereof will be omitted and a second embodiment of the present invention will be described next.

FIG. 5 is a block diagram of an anti-vibration camera with a built-in flash that represents a second embodiment of the present invention. Members having the same configurations as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted.
The second embodiment is a further development of the correction mode setting unit 11 of FIG. 1 as a correction mode setting unit 12.

The correction mode setting unit 12 allows the photographer to manually set the operation / non-operation of the image blur correction driving unit 8 at the time of photographing by operating the switch or the like of the main unit, and the camera automatically sets the operation / non-operation. The setting of each mode of the automatic setting to be set can be selected, and a signal according to the setting is output to the camera control unit 1. FIG. 6 is a flow chart for explaining the operation of the anti-vibration camera with a built-in flash according to the second embodiment of FIG. The description will be continued below along this flowchart. Note that the steps having the same contents as those in the flowcharts of FIGS.

In the present embodiment, the camera automatically selects whether or not the image blur correction operation is performed during shooting as a criterion for determining whether or not the image blur becomes noticeable. Moreover, it aims to be a camera that does not consume wasted energy. Steps 10 to 60 are the same steps as the flowchart of FIG.
Further, in this flowchart, steps 70 to 90 of the flowchart of FIG. 2 are not performed. Since steps 100 to 150 are the same as the flowchart of FIG. 4, step 152 will be described.

The camera control section 1 judges from the information from the above-mentioned correction mode setting section 12 whether or not the setting of this section is the off (non-operation) mode setting (step 15).
2). If the camera control unit 1 is in the off mode, YES
Then, the process proceeds to step 158, and if it is not the off mode, it is determined to be NO and the process proceeds to step 153. The camera control unit 1 determines whether the setting of the same unit is the Auto (automatic selection) mode setting (step 152).

If the Auto mode is set, the camera control section 1 determines YES and proceeds to step 154 to set the Auto mode.
If it is not in mode, it is set to on (operation) mode, so N
When it is determined to be O, the process proceeds to step 157. Camera control unit 1
Receives a shake detection signal from the shake detector 9 (step 154).

The camera control section 1 determines whether or not the image blur correction driving at the time of photographing is necessary (step 15).
5). As described in step 105 of the flowchart of FIG. 4, the camera control unit 1 first performs a normal AE calculation to obtain appropriate setting information of the shooting aperture value and the exposure time.

The criteria of the camera controller 1 in step 155 are as follows.・ Set the image blur risk exposure time based on the already obtained focal length information and compare it with the proper exposure time. If the proper exposure time <image shake dangerous exposure time, the image shake is not noticeable without activating the image shake correction function.
Proceed to 58. If the proper exposure time ≧ image blur risk exposure time, the image blur correction function should be activated, so the process proceeds to step 157.

The shake detection signal obtained in step 154,
The amount of image blur during the proper exposure time is predicted based on the focal length information and the distance measurement information. Then, the predicted image shake amount is compared with a predetermined (stored) reference image shake amount. If the predicted image blur amount is smaller than the reference image blur amount, the image blur is not noticeable even if the image blur correction function is not operated. Therefore, the process proceeds to step 158. If the expected image blur amount ≧ reference image blur amount, the image blur correction function should be activated, so
Go to step 157.

If one of the above conditions satisfies the condition of "go to step 157", it is preferable to proceed to step 157 from the viewpoint of image blur prevention. Note that the judgment criterion is according to the explanation of the example described in the explanation of step 100 of the flowchart of FIG. 2 (for example, about 1 second of the focal length). The image shake dangerous exposure time is changed each time according to the focal length at the time of shooting.

The determination of (1) may be performed by, for example, obtaining an expected image blur amount and comparing it with a predetermined reference image blur amount as follows. . FIG. 7 is a diagram showing the relationship between the camera of this embodiment and the image blur of the subject image. Distance between the shooting object and the shooting optical system / front principal plane (H), =
a. Shooting optical system, distance between the rear principal plane (H ') and image plane, =
b.

Specifically, the image plane is a fixed position with respect to the apparatus housing on the photographic film plane. Photographing optical system, front main plane (H) to back main plane (H ')
The distance between them is = T. (Optical lens thickness when the photographic optical system is one lens) The distance between the photographic object and the image plane, = R.

[0077]

## EQU1 ## R = a + T + b (1) where a, b, and T are focal lengths f of the photographing optical system during photographing.
And the value of R. What is the angle change of the optical axis?
Since it indicates that the camera device is blurred so as to rotate the optical axis around a certain point on the optical axis, the center of rotation is set to point N, and the distance between point N and the image plane is set to = n.

As shown in FIG. 7, it is assumed that the optical axis of the camera device changes dθ about the point N within a certain minute time (= dt) for a stationary subject. In other words, it can be considered that the direction of the subject has changed (−dθ) with respect to the present device with the point N as the center. In FIG. 5, the equivalent amount of movement of the subject due to this change is indicated by Do.

Assuming that the amount of change in the incident angle of the subject light on the photographing optical system is (-dφ), the following values are obtained.

[0080]

## EQU00002 ## -d.phi. = (A + T + b-n) .times. (-D.theta.) / A = -d.theta..times. (R-n) / a (2) Therefore, the amount of image blur (= as shown in FIG. And Di) have the following values.

[0081]

## EQU00003 ## Di = b.times. (-D.phi.) =-B.times.d.theta..times. (R-n) / a (3) where n is a hand-held experiment or the like, and a value most suitable for application is stored in advance. good. For example, if n = 0 (the center of rotation is the film surface position), “(R−n) / a = R / a
= (A + T + b) / a = 1 + (T + b) / a ”.

Next, the calculation of the predicted image blur amount in the proper exposure time will be considered based on the above equation. The angular velocity of camera shake is ω (rad / s), and the appropriate exposure time is t (s). Above a (mm)
Can be calculated from the photographing focal length information and the photographing distance information (both of which the camera control unit 1 has already been input). Also, T (mm),
The same applies to b (mm).

Therefore, the expected image blur amount X is obtained as follows.

[0084]

X = −b × ω × t × {1+ (T + b) / a} (4) Note that the condition (R
Is large; this condition applies for long-distance shooting)
It may be an expression in which the “(T + b) / a” part is omitted.

It is determined whether or not the predicted image blur amount is equal to or larger than a predetermined reference image blur amount. The reference image blur amount is, for example, the generally-known "allowable blur range of point image".
A value of about 0.03 mm may be used. Or 0.015 to maximize the use of the image blur correction function.
mm-0.03mm, and it may be operated frequently, considering the normal print size these days,
It may be set to a value of about 0.03 mm to 0.1 mm to reduce the frequency of operation.

Of course, another predetermined value determined by experiments or the like may be used.

As for the value of "ω" used in Equation 4, an average value of the angular velocity of camera shake at a certain time may be used, or a peak value at a certain time may be used. When the former is used, the “reference image shake amount” is a relatively small value (for example, 0.015 mm to 0.
It is desirable to set it to about 07 mm), and when using the latter, a relatively large value (for example, 0.03 mm to 0.
About 14 mm) is better.

Step 157 is the same as step 80 in the flowchart of FIG. 2, and step 158 is the same as step 90.
The description is omitted because it is equivalent to. . Further, since step 160 and the subsequent steps are the same as those in the flowchart of FIG. 2, the description thereof will be omitted. As described above, under the condition where there is a possibility of image blur, the image blur correction function automatically operates to prevent image blur, and whether the flash unit 5 emits light or not at the time of shooting is determined based on the subject brightness. In addition, it is possible to obtain a beautiful photograph with no image blur and a certain image impression and a good-looking image without image blur.

In the above example, the correction mode setting unit 12
The mode to be set in can be selected from three modes: manual setting of operation / non-operation and auto setting. However, for example, even if only the combination of auto mode and manual off mode, or the combination of auto mode and manual on mode, the above flow You may make it operate according to. (You can omit unnecessary steps.) Or even in the case of a camera only in auto mode,
It is the same.

[0090]

As described above, according to the present invention,
In the image stabilization camera according to claim 1, the flash control means controls the light emission of the flash means based on the detection result of the brightness detection means regardless of the operation of the image blur correction means, so that the same shooting condition is satisfied. Light emission of flash device regardless of film sensitivity
Since the non-emission conditions can be the same, it is possible to take pictures of the same image.

Also, by setting the flash emission / non-emission switching condition near a difference (estimated condition) between the natural light photographing condition and the artificial light photographing condition (estimated condition), the artificial light photographing condition can be changed. The effect of improving color reproducibility can be obtained. According to another aspect of the present invention, in the anti-vibration camera, when the photographing distance is shorter than a predetermined distance as a result of distance measurement by the distance measuring means, the flash control means is based on the detection result of the brightness detecting means and the calculation result of the photometric calculating means. Since the flash unit is controlled by using the flash unit, it is possible to take a photograph that is not affected by image blur even in a situation where image blur correction is difficult.

Further, at this time, the depth of field becomes deep, and it is possible to obtain the photographing condition more suitable for the close-up photographing. In the image stabilizing camera according to claim 3, the image blur correction control means activates the image blur correction means based on the exposure time calculated by the photometric calculation means, and the flash control means based on the detection result of the brightness detection means. Since the light emission (non-light emission) of the flash means is controlled,
It is possible to take pictures that are not affected by image blur.

In the image stabilizing camera according to the present invention, the image blur correction control means activates the image blur correction means at the time of photographing based on the detection result of the shake detection means and the calculation result of the photometry calculation means, and the flash control. Since the means controls the light emission (non-light emission) of the flashing means based on the detection result of the brightness detection means, it is possible to take a photograph without the influence of image blur. Claim 5
Since the photographer can select the operation / non-operation of the image blur correction unit in the image stabilization camera described above, it is possible to take a photograph according to the photographer's preference.

In the anti-vibration camera according to the sixth aspect of the invention, the film sensitivity is detected by using the electric contact, so that the film sensitivity can be detected with a simple structure.

[Brief description of drawings]

FIG. 1 is a block diagram of an image stabilization camera showing an embodiment of the present invention.

FIG. 2 is a flowchart of a camera control unit 1.

FIG. 3 is a flowchart of a camera control unit 1.

FIG. 4 is a flowchart of a camera control unit 1.

FIG. 5 is a block diagram of an image stabilization camera showing a second embodiment of the present invention.

FIG. 6 is a flowchart of the camera control unit 1.

FIG. 7 is a diagram showing the relationship between the camera of the present embodiment and the image blur of a subject.

FIG. 8 is a diagram showing a program curve in a program AE mode.

FIG. 9 is a diagram showing details of a film sensitivity setting unit 10.

[Explanation of symbols]

 1 Camera Control Section 2 Distance Measuring Section 3 Luminance Detection Section 4 Release SW 5 Flash Section 6 Focusing Section 7 Exposure Adjustment Section 8 Image Shake Correction Driving Section 9 Shake Detection Section 10 Film Sensitivity Setting Section 11 Correction Mode Setting Section

Claims (6)

[Claims] 1. A shake detecting means for detecting a shake of a camera, an image shake correcting means for correcting an image shake of the camera based on a detection result of the shake detecting means, and a brightness detecting means for detecting a subject brightness. An anti-vibration camera, comprising: flashing means for emitting auxiliary light at the time of shooting, characterized in that flash control means for controlling the flashing means is provided based on a detection result of the brightness detecting means. camera. 2. A vibration-proof camera according to claim 1, wherein a distance measuring means for measuring a subject distance at the time of photographing, a film sensitivity detecting means for detecting sensitivity information of a photographic film, the brightness detecting means and the film. Based on the detection result with the sensitivity detection means, further has a photometry calculation means for calculating the exposure time at the time of shooting, when the distance measurement result of the distance measurement means is smaller than a predetermined distance,
The flash control means, the detection result of the brightness detection means,
Further, the anti-vibration camera is characterized in that the flashing means is controlled based on the calculation result of the photometric calculation means. 3. The anti-vibration camera according to claim 1, wherein a film sensitivity detection means for detecting sensitivity information of a photographic film, and a detection result of the luminance detection means and the film sensitivity detection means A photometric calculation unit that calculates an exposure time, and an image blur correction unit that controls whether or not to activate the image blur correction unit at the time of shooting based on the exposure time calculated by the photometric calculation unit are further provided. A characteristic anti-vibration camera. 4. The anti-vibration camera according to claim 1, wherein a film sensitivity detection means for detecting sensitivity information of a photographic film, and a detection result of the luminance detection means and the film sensitivity detection means A photometric calculation means for calculating an exposure time, and an image blur correction control means for controlling whether or not to activate the image blur correction means at the time of photographing based on the detection result of the shake detection means and the calculation result of the photometric calculation means. An anti-vibration camera, which is further provided with. 5. The anti-vibration camera according to claim 1 or 2, further comprising selection means for selecting whether to activate or deactivate the image blur correction means according to a photographer's selection. camera. 6. The image stabilizing camera according to claim 2, wherein the film sensitivity detecting unit includes an electrical contact for detecting film sensitivity information from a film container.