JPH11305282A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera capable of preventing a failure photograph caused by underexposure from being taken with simple constitution. SOLUTION: Relating to this camera provided with a stroboscopic device 2; a distance to a photographic subject is detected by a subject distance detection part 4. Then, a strobe light emission decision part 1 decides whether or not the strobe light emission is performed. In the case of photographing by making the device 2 emit the light, the setting of photographic exposure time is changed by an exposure time decision part 3 in accordance with the detected result of the detection part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a strobe device, and more particularly, to a camera for preventing a failure photograph due to underexposure during strobe light emission.

[0002]

2. Description of the Related Art In recent years, a camera having a function of detecting a camera shake state and notifying the presence or absence of the camera shake has been developed. Then, in order to prevent camera shake, the camera shake limit time (1 /
The technique for photographing in f) is generally known. According to this technique, in order to prevent blurring on a photograph due to camera shake, exposure is performed at a time of at most 1/1 / f of a photographic focal length. When the appropriate photographing time is longer than 1 / f, the strobe light is emitted.

Further, Japanese Patent Application Laid-Open No. 3-150540 discloses a technique for setting (extending) the exposure time in accordance with the operation state of the shake correction apparatus. This is because when the blur correction mechanism is operating, there is no risk of image blurring due to camera shake even if the exposure time is extended, so that the time can be extended.

[0004]

However, in the above-described technique of photographing at the camera shake limit time (1 / f) to prevent camera shake, especially in a camera having a zoom lens, the lens is required to have a long focal length and a small size. The open F number of the camera becomes larger (darker), and the appropriate time is the camera shake limit time (1 /
Cases that are slower than f) are increasing. In general, in such a case, flash photography is performed. However, since the flash light does not reach the lens due to the darkness of the lens, there is a case where an underexposure occurs and a photograph fails.

In the technique disclosed in Japanese Patent Laid-Open Publication No. Hei 3-152540, a blur correction device for driving a part of the photographing optical system is required so as to cancel image blur caused by camera shake. This makes the camera / lens large and heavy,
In addition, it is generally expensive.

Accordingly, the present invention has been made in view of the above problems, and has as its object to provide a camera capable of preventing occurrence of a failed photograph due to underexposure with a simple configuration.

[0007]

That is, the present invention relates to a camera having a flash light emitting device, a subject distance detecting means for detecting a distance to an object to be shot, and a camera for emitting light from the flash light emitting device. And an exposure time setting means for changing the setting of the photographing exposure time in accordance with the detection result of the subject distance detection means.

The present invention is also directed to a camera having a flash light emitting device, a flash light emission determining means for determining whether or not to perform flash light emission photographing by the flash light emitting device, and a subject distance for detecting a distance to a shooting subject. A detecting means; and an exposure time determining means for determining a photographing exposure time based on the determination result of the flash light emission determining means and the detection result of the subject distance detecting means.

Further, the present invention relates to a camera having a flash light emitting device, a flash light emission determining means for determining whether or not to perform flash light emission photography by the flash light emitting device, and a subject distance for detecting a distance to a shooting subject. Detecting means, a shake detecting means for detecting a camera shake vibration state of the camera, and a photographing exposure time based on a judgment result of the flash light emission judging means, a detection result of the object distance detecting means, and a detection result of the shake detecting means. Exposure time determining means for determining the time.

According to the present invention, in the camera having the flash light emitting device, the distance to the photographing subject is detected by the subject distance detecting means. Then, at the time of photographing in which the flash light emitting device emits light, the photographing exposure time setting is changed by the exposure time setting means according to the detection result of the subject distance detecting means.

According to the present invention, in a camera having a flash light emitting device, it is determined by the flash light emission determining means whether or not to perform flash light emission photographing by the flash light emitting device. It is detected by the distance detecting means. The exposure time determining means determines the photographing exposure time based on the determination result of the flash light emission determining means and the detection result of the subject distance detecting means.

Further, according to the present invention, in a camera having a flash light emitting device, it is determined by the flash light emission determining means whether or not to perform flash light emission photographing by the flash light emitting device. It is detected by the distance detecting means. In addition, the camera shake vibration state of the camera is detected by a shake detection unit. Then, the exposure time determining means determines the photographing exposure time based on the determination result of the flash light emission determining means, the detection result of the object distance detecting means, and the detection result of the blur detecting means.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the concept of a camera according to the first embodiment of the present invention.

In FIG. 1, a flash emission determination unit 1
This is for determining whether or not to perform flash emission using the flash device (light emitting unit) 2 based on the shooting luminance information and the shooting focal length state. The output from the flash emission determination unit 1 is output to the exposure time determination unit 3 together with the flash unit 2.
Supplied to Then, the output of the subject distance detecting unit for detecting the distance between the camera and the subject is supplied to the exposure time determining unit 3. The exposure time determination unit 3 determines the exposure time at the time of shooting based on the determination result of the strobe light emission determination unit 1 and the detection result of the subject distance detection unit 4 depending on whether or not there is a change.

In such a configuration, first, the strobe light emission judging section 1 receives information from a not-shown light metering means and a focal length detecting means, and judges (determines) whether or not to perform strobe light emission. The subject distance detecting section 4 detects subject distance information based on outputs from a focus detecting unit and a distance measuring unit (not shown).

Based on the results of these determinations, the exposure time determination unit 3 determines the exposure time at the time of photographing based on the information. Specifically, when the flash emission determination unit 1 determines that flash photography has been performed, it is determined whether the subject distance information (value) obtained by the subject distance detection unit 4 is equal to or greater than a predetermined value. You. Here, when it is determined that the exposure time is equal to or longer than the predetermined value, specifically, the strobe light reaching distance, the shooting exposure time is set to be later than the predetermined time.

The reason why the exposure time is delayed when the subject distance is equal to or greater than a predetermined value (distance) is that the subject distance is so long that the strobe light does not sufficiently reach and underexposure occurs. This is because the exposure time is extended as much as possible.

FIG. 2 is a block diagram showing the concept of a camera according to a second embodiment of the present invention. In the embodiments described below, the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The difference from the first embodiment shown in FIG. 1 is that a shake detecting section 5 for detecting a camera shake state is added. The shake detecting unit 5 is configured by, for example, a known piezoelectric vibrating gyroscope (angular velocity sensor), and two shake detecting units are usually used to detect camera shake in two directions of a yawing direction and a pitching direction. The result detected by the shake detection unit 5 is sent to the exposure time determination unit 3.

The operation of the exposure time determination unit 3 will be described in detail. When the flash emission determination unit 1 determines that flash photography has been performed, the subject distance information obtained by the subject distance detection unit 4 is obtained. It is determined whether (value) is equal to or greater than a predetermined value. If it is determined that the exposure time is equal to or longer than the predetermined value, specifically, the strobe light reach distance, the shooting exposure time is made later than the predetermined time.

Up to this point, the present embodiment is the same as the above-described first embodiment. However, in the second embodiment, the current shake state is further determined from the output of the shake detecting section 5, and When the blurring state is large, the extension of the exposure time at the time of photographing is not performed, and when it is small, the exposure time is further extended. This makes it possible to efficiently set the exposure time according to the blurring state at that time.

FIG. 3 is a block diagram showing the concept of a camera according to a third embodiment of the present invention. The difference from the second embodiment shown in FIG. 2 is that a shooting mode setting unit 6 for setting a shooting mode of a camera is added.
Here, when the shooting mode of blur reduction based on the camera shake information detected by the shake detection unit 5 is set as the shooting mode of the camera, the exposure time determination hand unit 3 determines the time according to this. The method is decided.

Here, the photographing mode for blur reduction will be briefly described. Exposure start instruction (second release switch ON)
The camera shake state is detected by the camera shake detection unit 5 from the time until the exposure operation is actually started, and the exposure is started at a timing when the camera shake is small. In this method, the exposure cannot be started forever until the camera shake is not reduced, so that after a certain time has elapsed, the exposure operation is started regardless of the magnitude of the camera shake.

The operation of the exposure time determination unit 3 will be described in detail. When the flash emission determination unit 1 determines that flash photography has been performed, the subject distance information obtained by the subject distance detection unit 4 is obtained. It is determined whether (value) is equal to or greater than a predetermined value. If it is determined that the exposure time is equal to or longer than the predetermined value, specifically, the strobe light reaching distance, the exposure time for shooting is set to be later than the predetermined time.

Up to this point, the third embodiment is the same as the above-described first and second embodiments. However, in the third embodiment, it is assumed that the blur reduction mode has been set as the photographing mode. Until the predetermined time elapses, the photographing exposure time is extended regardless of the camera shake state. Then, when a certain time has elapsed, as in the case of the second embodiment, the extension of the second time is stopped in accordance with the blurring state.

This makes it possible to efficiently set the exposure time. Next, a fourth embodiment of the present invention will be described. FIG. 4 is a block diagram showing a more specific configuration of the first embodiment of FIG. 1 described above.

In FIG. 4, outputs from a film sensitivity detection unit 11 for detecting sensitivity information of a photographic film and a photometry unit 12 for measuring a luminance state are output from an exposure time calculation unit 13.
Supplied to The exposure time calculation unit 13 receives information from the film sensitivity detection unit 11 and the photometry unit 12,
This is for calculating an appropriate exposure time for photographing. The output of the exposure time calculation unit 13 is sent to the flash emission determination unit 1 together with the output from the focal length detection unit 14 that detects the current shooting focal length state.

The exposure time determining unit 3 is supplied with the strobe light reaching distance information from a constant storage unit 15 in which the information is stored. Then, the exposure unit 16 performs exposure according to the exposure time determined by the exposure time determination unit 3.

In such a configuration, the proper flash exposure time information from the exposure time calculation unit 13 and the focal length information from the focal length detection unit 14 are input to the flash emission determination unit 1. At this time, the flash exposure determination unit 1 compares the appropriate exposure time and the camera shake limit time (one-fourth of the focal length). If the appropriate exposure time is longer than the required time, it is determined that the flash emission is necessary. The information (exposure second: one-fourth of the focal length, strobe light emission photography) to that effect is transmitted to the exposure second determining unit 3.
Sent to At the time of exposure, the flash device 2 emits flash light.

On the other hand, the exposure time determining section 3 receives the information from the subject distance detecting section 4 and compares the subject distance information from the subject distance detecting section 4 with the strobe light reaching distance information from the constant storage section 15. Is performed. Here, when the subject distance value is larger than the strobe light reaching distance, an exposure time that is later than the exposure time information (one-fourth of the focal length) sent from the subject distance detection unit 4 is photographed, for example, about one step. The exposure operation by the exposure unit 16 is performed as the exposure second time.

Next, referring to the flowchart of FIG.
A specific operation procedure of the fourth embodiment will be described. First, in step S1, initialization is performed. Here, the flags F_ST, F_SS, F_
MODE is set to “1”. Here, the flag F_ST is a flag indicating whether or not to perform strobe light emission at the time of exposure. “1” means no light emission, and “0” means light emission. The flag F_SS is a flag indicating whether or not to change (extend) the exposure time, which is a feature of the present invention, as described above. “1” indicates no change, and “0” indicates change. Shall mean. Furthermore,
The flag F_MODE is a flag indicating whether or not the shooting mode of the camera is a blur reduction mode, and “1” indicates a shooting mode other than blur reduction (normal mode), and “0” indicates a blur reduction mode. Shall mean.

Next, in step S2, it is determined whether or not a photographing preparation instruction operation (first release operation) is being performed. Here, if the above-described determination has been made, the process proceeds to step S3;
Is repeated.

In step S3, it is determined whether the AE and AF operations have been completed. When both AE and AF have been completed, the process proceeds to step S20 described later, and otherwise, the process proceeds to step S4.

When the photometric operation is performed in step S4, film sensitivity information is read in step S5. Next, in step S6, an appropriate exposure time "T1" is calculated based on the results in steps S4 and S5.

Next, in step S7, focal length information is read out. In step S8, based on the focal length information read out in step S7, the camera shake limit time (one-fourth of the focal length) is obtained. Is calculated. The calculated camera shake limit time is “T2”.

In step S9, a focus detection operation and a distance measurement operation are performed. In step S10, the focusing lens (not shown) is driven (Lens Drive; LD) in response to the result in step S9. In the case of a lens shutter camera, the lens is not driven here, but is performed between the photographing start instruction operation (second release operation) and the exposure operation.

In step S11, the appropriate exposure time "T1" calculated in step S6 is compared with the value in step S8.
It is determined whether or not the time is longer than the camera shake limit time “T2” calculated in (2). Here, if the appropriate exposure time “T1” is larger, the process proceeds to step S12; otherwise, the process proceeds to step S18.

In step S12, the flag F_ST is set to "0", and flash photography is performed. This is because the proper shooting time “T1” is later than the camera shake limit time “T2”, and if the shooting is performed at the proper shooting time, there is a risk of image blurring due to camera shake. This is because it is necessary to shoot with flash light.

Then, in step S13, as the photographing time at the time of flash photographing, the camera shake limit time, for example, T2
= 1 / f is set. Next, the subject distance information “L1” is read in step S14, and furthermore, in step S1.
At step 5, the strobe light reaching distance information "L2" is read.

In step S16, subject distance information "L"
It is determined whether or not “1” is greater than the strobe light reaching distance information “L2.” Here, the subject distance information “L” is determined.
If “1” is larger, the process proceeds to step S17; otherwise, the process proceeds to step S20.

In step S17, since the subject distance information "L1" is larger than the strobe light reaching distance information "L2", that is, there is a possibility that the strobe light does not reach the subject, resulting in underexposure. Reset (extend)
Is performed.

On the other hand, if it is determined in step S11 that the camera shake limit time "T2" is larger than the proper exposure time "T1", the process proceeds to step S18, and the flag F is set.
_ST is set to "1". This is because there is no need for strobe light emission because the appropriate shooting time “T1” is smaller (higher speed) than the camera shake limit time “T2”.
Therefore, in step S19, the appropriate photographing time “T1” is set as the exposure photographing time, and then the process proceeds to step S20.

In step S20, it is determined whether or not a photographing start instruction operation (second release operation) is being performed. If this determination has been made, step S21
Otherwise, the process returns to step S2.

When the exposure operation is started in step S21, it is determined in step S22 whether or not the flag F_ST is "0". Here, if the flag F_ST is "0", the flow proceeds to step S23 to perform strobe light emission; otherwise, the flow proceeds to step S2.
Proceed to 4.

In step S24, it is determined whether a predetermined exposure time has elapsed. Here, if the predetermined exposure time has elapsed, the process proceeds to step S25, and if not, the determination in step S24 is repeated.

When the exposure operation is completed in step S25, the flag F_ST is returned to "1" in step S26. After the film is wound in step S27, the process returns to step S2.

As described above, in the fourth embodiment, when the strobe light emission determination unit 1 determines that the flash photography is performed, the object distance information (value Is determined to be greater than or equal to a predetermined value. If it is determined to be greater than or equal to the predetermined value, specifically, to be equal to or longer than the strobe light reaching distance, the exposure time for photographing can be made later than the predetermined time.

Next, a fifth embodiment of the present invention will be described. FIG. 6 is a block diagram showing a more specific configuration of the second embodiment of FIG. 2 described above.

FIG. 6 is different from the fourth embodiment shown in FIG. 4 in that a shake detecting section 5 and a shake determining section 17 are added. The shake determining unit 17 is for determining whether the camera shake state value detected by the shake detecting unit 5 is small or large. The exposure time determination unit 3 determines whether or not to change the exposure time as described in the second embodiment, based on the result of the blur state determination.

Here, the operation of the fifth embodiment will be described with reference to the flowchart of FIG. Steps S31 to S45 and steps S50 and S51 are
Step S1 of the flowchart of FIG.
Steps S15 to S15 and steps S18 and S19 are not described here.

In step S46, it is determined whether or not the subject distance information "L1" is larger than the strobe light reaching distance information "L2". Here, if the subject distance information “L1” is larger, the process proceeds to step S47,
Otherwise, the process proceeds to step S49.

In step S47, the above-mentioned step S46
, The flag F_SS is set to “0”. This means a change in exposure time. Next, in step S48, since the subject distance information "L1" is larger than the strobe light reaching distance information "L2", that is, there is a possibility that the strobe light does not reach the subject, resulting in underexposure. Reset (extend)
Is performed. Thereafter, the process proceeds to step S52.

On the other hand, in step S49, the flag F_SS is set to "1" in response to the result of the determination in step S46.
Is set to This means that the exposure time is not changed.

In step S52, it is determined whether or not a shooting start instruction operation (second release operation) is being performed. If this determination has been made, step S53
Otherwise, the process returns to step S32.

In step S53, it is determined whether or not the flag F_SS is "0". Here, if the flag F_SS is “0”, the process proceeds to step S54,
Otherwise, the process proceeds to step S58.

In step S54, the camera shake state is detected, and in the following step S55, the camera shake state detected in step S54 is calculated. This calculates (understands) the level of image blur from the detected camera shake information, the exposure time, the shooting focal length, and the like.

Next, in step S56, it is determined whether or not the blur state is equal to or higher than a predetermined level. here,
If it is determined that the blur state is equal to or higher than the predetermined level, the process proceeds to step S57; otherwise, the process proceeds to step S58.

In step S57, in response to the fact that the blur state is equal to or higher than the predetermined level, the exposure time reset in step S48 is changed (set again). This is because it is considered that the extension of time is not preferable even in order to prevent underexposure because the blur state is large.

Steps S58 to S63 correspond to the steps shown in FIG.
Are the same as steps S21 to S25 in the flowchart of FIG. Then, in step S64, upon completion of the exposure, the flag F_ST is returned to "1". Then, after the film is wound in step S65, the process returns to step S32.

As described above, in the fifth embodiment, when the blur state is large, the extended exposure time is canceled (reduced). However, as shown in the flowchart of FIG. 8, when the blur state is small, it is possible to further extend the exposure time.

FIG. 8 shows a modification of the fifth embodiment.
This will be described with reference to the flowchart of FIG. In the flowchart of FIG. 8, steps other than steps S56 ', S57a, and S57b are the same as the steps of the flowchart of FIG. 7 described above, and thus only different portions will be described.

In step S56 ', it is determined whether or not the blur state is equal to or higher than a predetermined level. If it is determined that the blur state is equal to or higher than the predetermined level, step S57 is performed.
a, otherwise, to step S57b.

In step S57a, in response to the blur state being equal to or higher than the predetermined level, the exposure time reset in step S48 is changed (reset again: reduction of the extension time). This is because it is considered that the extension of the second time is not preferable even in order to prevent underexposure because the blur state is large. Thereafter, the process proceeds to step S58.

In step S57b, in response to the fact that the blur state is not higher than the predetermined level, step S48 is performed.
Exposure seconds reset by are changed (re-setting: further time extension). This is because the blur state is small, and it is considered that the time extension for preventing exposure underexposure can be performed a little more. Thereafter, the process proceeds to step S58.

As described above, in the fifth embodiment and its modified example, the current blur state is determined from the output of the blur detecting section 5. It is possible to eliminate the time extension or, if it is small, to extend the exposure time further.

Next, a sixth embodiment of the present invention will be described. FIG. 9 is a block diagram showing a more specific configuration of the third embodiment of FIG. 3 described above.

FIG. 9 differs from the fifth embodiment shown in FIG. 6 in that a photographing mode setting unit 6 and an exposure timing determination unit 18 are added. The exposure timing determination unit 18 determines a timing to actually start the exposure operation based on the result of the magnitude determination of the blur from the blur determination unit 17, and issues an exposure timing instruction to the exposure unit 1.
6 to send. The exposure timing determination unit 18 operates only when the shooting mode setting unit 6 selects (sets) the blur reduction mode as the shooting mode.

Next, the operation of the sixth embodiment of the present invention will be described with reference to the flowchart of FIG. Steps S71 and S72, steps S74 to S74
81 and steps S85 to S100 are the same as steps S1, S2, steps S20 to S27, and steps S4 to S19 in the above-described flowchart of FIG.

In step S73, it is determined whether the AE and AF operations have been completed. Here, if the determination has been completed, the process proceeds to step S74; otherwise, the process proceeds to step S82.

In step S82, it is determined whether or not the blur reduction mode is set as the camera shooting mode. Here, if the blur reduction mode is set, the process proceeds to step S83, and the flag F_MO to that effect is set.
DE is set to "1". On the other hand, step S82
If the blur reduction mode is not set in step S84, the process proceeds to step S84, and the flag F_MODE is set to "0".

After the processing in steps S83 and S84,
Proceed to step S85. FIG. 11 is a flowchart illustrating the operation of the modification of the sixth embodiment described above.

In the flowchart of FIG. 11, steps S111 to S132 are the same as steps S31 to S52 of the flowchart of FIG. In step S133, it is determined whether the flag F_MODE is "1". If the flag F_MODE is "1", the process proceeds to step S138; otherwise, the process proceeds to step S134. Steps S138 to S142 are the same as steps S53 to S57 in the flowchart of FIG.

In step S134, a camera shake state is detected. Next, in step S135, the camera shake state detected in step S134 is grasped. This grasps (calculates) the level of image blur from the detected camera shake information, the exposure time, the photographing focal length, and the like.

Then, in step S136, it is determined whether or not the blur state is equal to or lower than a predetermined level. Here, if it is determined that the blur state is equal to or lower than the predetermined level, the process proceeds to step S143; otherwise, the process proceeds to step S143.
Proceed to 137.

In step S137, it is determined whether or not the time waiting for the blur to be equal to or lower than the predetermined level has exceeded the predetermined time. Here, if the predetermined time has elapsed, the process proceeds to step S138; otherwise, the process returns to step S134, and the subsequent processing operations are repeated.

Steps S143 to S148 are the same as steps S21 to S26 in the flowchart of FIG. Then, in step S149,
Upon completion of the exposure, the flags F_ST and F_MODE are returned to “1”. Next, after the film is wound in step S150, the process returns to step S112.

As described above, according to the sixth embodiment and the modification thereof, in response to the setting of the blur reduction mode as the photographing mode, the camera shake state is maintained until the above-mentioned predetermined time elapses. Irrespective of the above, the extension of the exposure time is performed, and when a certain time has elapsed, the extension of the time extension can be stopped according to the blurring state, as in the case of the fifth embodiment described above. It becomes possible.

As described above, according to the present invention, when the appropriate exposure time is slower than the camera shake limit time (1 / f), the flash emission is determined and the flash emission shooting is performed. , For changing the exposure time. This makes it possible to alleviate the underexposure state in a scene in which strobe light does not reach and underexposure tends to occur.

Further, by performing the above-described operations in accordance with the camera shake state or the shooting mode setting for blur reduction, a more efficient effect can be obtained. According to the above embodiment of the present invention, the following configuration can be obtained.

(1) Flash light emitting device of the camera, flash light determining means for determining flash light emission by the flash light emitting device, subject distance detecting means for detecting the distance to the subject, and determination results of the flash light determining means And an exposure time determining means for determining a photographing exposure time in accordance with a detection result of the subject distance detecting means.

(2) Flash light emitting device of the camera, flash light determining means for determining flash light emission by the flash light emitting device, subject distance detecting means for detecting the distance to the subject, and detecting the camera shake state An exposure time determining means for determining a photographing exposure time according to the determination result of the flash light emission determining means, the detection result of the subject distance detecting means, and the detection result of the blur detecting means. A camera comprising:

(3) Flash light emitting device of the camera, flash light emitting determining means for determining the flash light emission by the flash light emitting device, subject distance detecting means for detecting the distance to the subject, and detecting the camera shake state. And a photographing mode setting unit for setting a photographing mode of the camera, a judgment result of the flash emission judging unit, a detection result of the object distance detecting unit, a detection result of the blur detecting unit, and An exposure time determining means for determining a shooting exposure time according to a setting mode of a shooting mode setting means.

(4) In the camera described in (1), (2) or (3), when the subject distance detected by the subject distance detecting means is a predetermined value or more, the exposure time is determined. A camera wherein the exposure time determined by the means is longer than usual.

(5) In the camera described in (3), the photographing mode set by the photographing mode setting means is a shake reduction mode which operates in accordance with the output of the shake detecting means. And the camera.

(6) In the camera described in the above (1), (2) and (3), the flash light emission judging means performs the flash light based on the calculated value of the appropriate photographing exposure time and the focal length of the photographing lens. A camera for determining whether to emit light from a light emitting device.

(7) In a camera having a flash light emitting device, a subject distance detecting means for detecting a distance to an object to be photographed; A flash shooting time setting means for setting a predetermined shooting exposure time for flash shooting, and a flash shooting time when the subject distance detected by the subject distance detecting means is a predetermined value or more. And an exposure time resetting means for changing the exposure time.

(8) In a camera having a flash light emitting device, a subject distance detecting means for detecting a distance to an object to be shot, and a flash set for flash light emission photographing when the flash light emitting device emits light. An exposure time determining means for determining the flash exposure time for flash light emission shooting in accordance with the exposure time for shooting and the subject distance detected by the subject distance detecting means. A camera characterized by the following.

[0088]

As described above, according to the present invention, it is possible to provide a camera which can prevent a failure photograph due to underexposure with a simple structure.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the concept of a camera according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing the concept of a camera according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing the concept of a camera according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a fourth embodiment of the present invention, which is a more specific configuration of the first embodiment of FIG. 1;

FIG. 5 is a flowchart illustrating a specific operation procedure according to the fourth embodiment;

FIG. 6 is a block diagram showing a fifth embodiment of the present invention, which is a more specific configuration of the second embodiment of FIG. 2;

FIG. 7 is a flowchart illustrating an operation of the fifth embodiment.

FIG. 8 is a flowchart illustrating an operation of a modification of the fifth embodiment.

FIG. 9 shows a sixth embodiment of the present invention, and is a block diagram showing a more specific configuration of the third embodiment of FIG. 3;

FIG. 10 is a flowchart illustrating an operation of the sixth embodiment.

FIG. 11 is a flowchart illustrating an operation of a modification of the sixth embodiment.

[Explanation of symbols]

 1 strobe light emission determination unit, 2 strobe device, 3 exposure time determination unit, 4 subject distance detection unit, 5 blur detection unit, 6 shooting mode setting unit, 11 film sensitivity detection unit, 12 photometry unit, 13 exposure time calculation unit, 14 focal length detection unit, 15 constant storage unit, 16 exposure unit, 17 blur determination unit, 18 exposure timing determination unit.

Claims (3)

[Claims] 1. A camera having a flash light emitting device, a subject distance detecting means for detecting a distance to an object to be photographed, and a detection result of the subject distance detecting means at the time of photographing for causing the flash light emitting device to emit light. An exposure time setting means for changing the setting of the photographing exposure time according to the following. 2. A camera having a flash light emitting device, comprising: a flash light emission determining means for determining whether or not to perform flash light emission photographing by the flash light emitting device; and a subject distance detecting means for detecting a distance to a shooting subject. An exposure time determining means for determining a photographing exposure time based on the determination result of the flash light emission determination means and the detection result of the subject distance detection means. 3. A camera having a flash light emitting device, comprising: a flash light emission determining means for determining whether or not flash light emission photographing is performed by the flash light emitting device; and a subject distance detecting means for detecting a distance to a shooting subject. A camera shake detecting means for detecting a camera shake vibration state; and a photographing exposure time is determined based on a result of the flash light emission determining means, a result of the object distance detecting means, and a result of the blur detecting means. A camera comprising: