JPH07146495A - Automatic bracketing photographing device - Google Patents

Abstract

PURPOSE:To perform proper exposure and prevent the order of photographing from dislocation relative to the order of exposure changes as much as practicable by conducting first the photographing with the proper exposure calculated when the residual amount of a recording medium sensed is smaller than the set number of frames. CONSTITUTION:If a film termination sensing means 6 previously judges that the termination is coming on the way of a set of auto-bracket photographing operations, an exposure control means 4 makes photographing with a proper exposure, and then the exposure is dislocated bit by bit. When judgement is such that the film termination will not be attained on the way of the auto- bracket photographing operations, the exposure should be changed bit by bit from the under-side (or from the over side. This enables performing photographing with the proper exposure even though the termination is reached on the way of auto-bracket photographing operations, so that it is not likely to miss the shutter chanse with proper exposure. When the film termination is not reached, the exposure varies at a certain interval of correction amount in the photographing sequence to offer a good convenience in use.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto-bracketing photographing device used as a camera.

[0002]

2. Description of the Related Art In a conventional camera capable of auto-bracketing photography of this type, if the film end is reached before a set of auto-bracketing photography ends, the setting of auto-bracketing photography may be canceled. It was supposed to initialize the first frame of a set of auto-bracketing photography while keeping the auto-bracketing photography settings.

[0003]

However, in a camera capable of auto-bracketing photography, the film end may be reached without taking the proper exposure that should be originally determined by the camera. With this, it is not possible to obtain the proper exposure originally determined by the camera without changing the film and then taking the picture again, but it takes time to change the film and then take the picture again. There is a problem that there is a high possibility that you will miss it.

Further, when the auto-bracketing photography is started from the proper exposure, although the photography with the proper exposure is carried out, the order of photography and the order of change of exposure are deviated,
There is a problem that it is inconvenient to organize the photos.

The present invention has been made in view of the above problems, and an object of the present invention is to reliably perform shooting with proper exposure and to prevent the order of shooting and the order of change of exposure from deviating as much as possible. To do.

[0006]

In order to achieve the above object, the present invention provides an auto-bracketing photographing device having an auto-bracketing photographing means for photographing a plurality of times under varying exposure conditions. A recording medium detected by the remaining amount detecting means, which comprises a remaining amount detecting means for detecting the amount, an appropriate exposure calculating means for calculating the appropriate exposure, and a photographing frame number setting means for setting the number of remaining frames that can be photographed. The remaining amount is
If the number of shots is less than the number set by the setting unit,
It is configured to first perform shooting with the proper exposure calculated by the proper exposure calculation means.

[0007]

In the auto-bracketing photographing device having the above structure, when the remaining amount of the recording medium detected by the remaining amount detecting means is smaller than the number of frames set by the photographing frame number setting means, the proper exposure calculating means calculates Since the photographing with the proper exposure is performed first, the photographing with the proper exposure can be surely performed, and the order of photographing and the order of changing the exposure can be prevented as much as possible.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block connection diagram showing an embodiment of an auto-bracketing photographing device according to the present invention.

In FIG. 1, reference numeral 1 is a control circuit, which is composed of a CPU circuit for controlling the entire auto-bracketing photographing device. 2 is an operation for setting and canceling the auto-bracketing mode, setting the number of shots N for a set of auto-bracketing shots, and setting a correction step X, which is a difference in exposure correction amount for each auto-bracketing shot. It is a switch. Reference numeral 3 denotes display means for displaying the setting state of the auto bracketing mode, the set value of the number of shots N, and the set value of the correction step X.

An exposure control unit 4 is composed of a shutter and an aperture (including an aperture control device), and controls an exposure amount when photographing. Reference numeral 5 is a film feeding means for winding up or rewinding a film of one frame.
Reference numeral 6 is a film end detecting means for detecting the end of the film. The switch SW is a release switch that turns on and off in conjunction with a release button (not shown).

Next, the control procedure of the control circuit 11 will be described with reference to the flow charts of FIGS.

When the first frame of the film faces the aperture, the program shown in FIG. 2 is started, and the initial setting is performed in step S1. In step S1, the flag S and the flag E are reset and the count value n is set to 1. The flag S becomes 1 when the auto bracketing mode is set and becomes 0 when it is released. The flag E is set to 1 when it is expected that the shooting in the set of auto-bracketing modes will not end even at the end of the film. The count value n is a film count value.

Next, in step S2, the count value k is set to 1
Set to. This count value k indicates the number of the frame to be photographed in a set of auto-bracketing photography when the auto-bracketing mode is set. Details of the setting display in step S3 are shown in FIG. Here, when the auto bracketing mode is set by the setting means 2, the flag S is set to 1, and when it is released, it is reset to 0. Further, the flag E is reset from 1 to 0 in association with the cancellation of the auto bracketing mode. The number of shots N and the correction step X set by the setting means 2 are read, and only when the auto bracketing mode is set, the setting of the auto bracketing mode, the correction step X and the number of shots N are displayed.

In step S4, the release switch SW
To determine if the When it is on, the process proceeds to step S5, and when it is off, the process returns to step S3. Step S5
Then, the setting of the auto bracketing mode is determined.
If the auto bracketing mode is set, the process proceeds to step S12, and if it is not set, the step S12 is performed.
Go to 6.

In step S6, the exposure value is calculated from the film sensitivity and the subject brightness, and the shutter speed and the aperture value are determined. In step S7, the exposure control unit 4 shoots at the shutter speed and aperture value determined in step S6. In step S8, the film feeding means 5
To wind the film by one frame. In step S9, the film count value n is incremented. In step S10, it is determined whether the film end detecting means 6 has detected the end of the film.

At the end, the process proceeds to step S11,
If it is not the end, the process returns to step S3. Step S11
At, the film is rewound by the film feeding means 5, and the process is completed. The processes of steps S3 to S11 are
This is a normal shooting process in which the auto bracketing mode is not set.

When it is determined in step S5 that S = 1,
Control goes to step S12. In step S12, it is determined whether the count value k is 1. When k = 1, the process proceeds to step S13, and when k ≠ 1, the process proceeds to step S15. In step S13, it is determined whether or not the film end will be reached in the middle of one set of auto-bracketing photography. Since it is not possible to know the number of films in advance, it is assumed that the number of films is F1 (for example, 20 or 24 which is relatively often used is preferable), and this number of films F1
Is compared with the sum of the film count value n and the number of shots N,
When F1 <n + N, it is determined that the film end will be reached in the middle of one set of auto-bracketing photography, and the process proceeds to step S14. In step S14, the flag E is set to 1
Set to. When F1 ≧ n + N, it is determined that the film end will not be reached in the middle of one set of auto-bracketing photography, and the process proceeds to step S15. The case where the number of films can be known in advance will be described later with reference to FIG.

In step S15, the flag E is judged. When E = 0, the process proceeds to step S16, and when E = 1, the process proceeds to step S17. In step S16, normal auto-bracketing photography processing (FIG. 4) is performed.

In the process of auto-bracketing photography shown in FIG. 4, first, the exposure value Ev that provides the proper exposure is calculated from the film sensitivity and the subject brightness (step S34). Exposure compensation amount ΔEv

ΔEv = (N + 1 / 2−k) · X (1) is calculated (step S35), and the exposure value BEv is calculated by BEv = Ev + ΔEv (2) (step S35). In step S36, a combination of the shutter speed and the aperture value that gives the exposure value BEv is determined. By this procedure, the exposure value BEv that increases from the underexposure to the overexposure by the correction step X is sequentially determined (step S37). If step S35 ′ in FIG. 6 is performed instead of step S35, the exposure value BEv that is decreased by the correction step X is sequentially determined from overexposure to underexposure.

FIG. 5 shows the details of the processing in the case where the end of the film is reached in the middle of one set of auto-bracketing photography in step S17 (FIG. 2). In this process, first of all, a proper exposure is photographed in the first photographing.

In FIG. 5, the exposure value Ev that provides the proper exposure is calculated from the film sensitivity and the subject brightness (step S3).
8) At the time of the first shooting, ΔEv = 0 is set to calculate the exposure value BEv of the expression (2), that is, the exposure value that provides the proper exposure is obtained, and the combination of the shutter speed and the aperture value is determined. After that, the exposure value that is underexposed only in the correction step, the exposure value that is overexposed only in the correction step, the exposure value that is underexposed by twice the correction step, and the exposure that is overexposed by twice the correction step. .. are calculated, and the combination of the shutter speed and the aperture value that gives the exposure value BEv is determined (step S4).
5).

In step S18 (FIG. 2), photographing is performed as in step S7. In step S19,
Winding is performed in the same manner as step S8, and step S2
At 0, the film count value n is incremented. In step S21, the film end is determined as in step S10. If it is the end, the process proceeds to step S11, and if it is not the end, the process proceeds to step S22. In step S22, the count value k is compared with the number of shots N, and when k = N, it is determined that one set of auto-bracketing shooting has ended, and the process returns to step S2. k
When ≠ N, it is determined that one set of auto-bracketing shooting is in progress, and the process proceeds to S23. In step S23, after the count value k is incremented, the process returns to step S3.

The above steps S3 to S5 to S12 to S
16-S18-S23 or steps S3-S5-S1
The flow of 2 to S16 to S18 to S22 to S2 is a process when it is determined that the end of the film is not reached in the middle of one set of auto-bracketing photography, and the exposure value is increased by each correction step X from underexposure to overexposure. An increasing number of photographs are taken. Further, if the modification of FIG. 6 is performed, shooting is performed in which the exposure value is decreased by the correction step X from overexposure to underexposure.

Further, steps S3 to S5 to S12 to S1
5 to S17 to S23 or steps S3 to S5 to S12
The flow from S15 to S17 to S21 to S11 is the process when it is determined that the film end will be reached in the middle of one set of auto-bracketing shooting. First, after performing the proper exposure shooting, only the correction step X is exposed. Undershoot, overexposure shooting only in correction step X,
Take underexposure only twice the correction step X,
Take overexposure only twice the correction step X,
The end of the film is reached while shooting.

At this time, since the proper exposure is first photographed, the auto-bracketing photographing does not miss the proper exposure shutter opportunity. Since the number of films is assumed, if more films than the assumed number F1 of films are loaded, steps S3 to S5 to S12 to S15 to S
The flow is from 17 to S22 to S2, but as a result, only auto-bracketing photography in a different order is performed.

Next, a modified example will be described.

FIG. 7 is a modified example of FIG. 5. First, the exposure value Ev of the proper exposure is calculated, and thereafter, the exposure value BEv and the correction step X of the correction step X which are over by the correction step X are contrary to FIG.
In this example, the underexposure value BEv, the overexposure value BEv by twice the correction step X, the overexposure value BEv, the underexposure value BEv by twice the correction step X, and so on are calculated.

FIG. 8 is a modified example of FIG. 5, in which the exposure value Ev for proper exposure is first calculated, and thereafter, the exposure value BEv for overexposure by the correction step X is sequentially calculated from the underexposure exposure value BEv. However, the exposure value, which is the proper exposure on the way, is omitted.

FIG. 9 shows a modification of FIG. 5, in which the film is wound up by first taking a picture with the exposure value Ev of proper exposure. Then, at the end, the film is rewound to finish. If it does not reach the end, the exposure value BEv that is overexposed by the correction step X is sequentially calculated from the underexposure exposure value BEv.

FIG. 10 shows a modified example of FIG. 8 in step S.
54 and step S55 are changed to step S54 'and step S55', respectively.
v is calculated, and thereafter, the exposure value BEv that is underexposed by the correction step X is sequentially calculated from the overexposed exposure value BEv, but the exposure value that is the proper exposure in the middle is omitted. .

FIG. 11 is a modification of FIG. 9, and step S
60 is changed to step S60 '. The change is that when the exposure value Ev of the proper exposure does not reach the end of the film after shooting, the exposure value BEv that is underexposed by the correction step X is sequentially calculated from the overexposure exposure value BEv.

Next, an example in which the number of films can be known in advance will be described. FIG. 12 is a block connection diagram, and only the points different from FIG. 1 are described. In addition to the setting means 2 to the film end detecting means 6 and the switch SW shown in FIG. 1, the control circuit 1'is connected to the film number detecting means 10. This is to detect information about the number of films in the DX code provided on the film cartridge. The difference between the control circuit 1'and the control circuit 1 is that step S13 of FIG. 2 is step S13 as shown in FIG.
That is, 101 and step S102 are performed. This makes it possible to more reliably determine whether or not the film end will be reached during auto-bracketing photography.

As described above in the embodiments, according to the present invention, when it is determined in advance that the film end will be reached in the middle of one set of auto-bracketing shooting, the exposure is performed after the shooting with the proper exposure. When it is determined that the film end will not be reached in the middle of one set of auto-bracketing shooting, the exposure is sequentially changed from the under side (or the over side). Therefore, even if the end of the film is reached during auto-bracketing shooting, shooting with proper exposure can be performed, and a shutter opportunity for proper exposure will not be missed. Also,
When the film does not reach the end, the exposure changes in the same correction amount in the order of shooting, so there is no inconvenience in organizing photos.

In the above example, auto-bracketing shooting is continued even when the number of remaining images is 2 or less. When the remaining number is 1, only proper exposure is taken, and the remaining 2 images are taken. In the case of, the shooting ends with the shooting with proper exposure and the shooting with another one.

In such a case, when performing overexposure and underexposure photography alternately, it is better not to perform auto-bracketing photography. Therefore, it is preferable to prohibit auto-bracketing photography. That is, in the case of FIG. 2, step S13 and step S14.
And F1 ≦ n + 2, and if denied,
The above contents can be carried out by proceeding to step S14 as it is and jumping to step S6 when affirmative. Further, in the case of FIG. 13, step S10.
If the determination of F1 ≤ n + 2 is made between step 2 and step S14, and if negative, the process proceeds to step S14, and if affirmative, the process jumps to step S6.

Further, when the number of remaining images is an even number, odd-numbered shooting may be performed, and auto-bracketing may be performed for the remaining one shooting. At this time, the number of underexposed images and the number of overexposed images are the same, which is preferable for organizing photographs. Furthermore, it goes without saying that the value of the correction step may be set to a large value in accordance with the number of remaining sheets and a modification may be added to further enhance the effect of auto-bracketing photography.

[0040]

As described above, according to the present invention, when the remaining amount of the recording medium detected by the remaining amount detecting means is smaller than the number of frames set by the shooting frame number setting means, the proper exposure calculating means is provided. Since the photographing with the calculated proper exposure is performed first, the photographing with the proper exposure can be surely performed, and the order of photographing and the order of changing exposure can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a block connection diagram showing an embodiment of an auto-bracketing photographing device according to the present invention.

FIG. 2 is a flowchart showing an embodiment of an auto-bracketing photographing device according to the present invention.

FIG. 3 is a flowchart showing an embodiment of an auto-bracketing photographing device according to the present invention.

FIG. 4 is a flowchart showing an embodiment of an auto-bracketing photographing device according to the present invention.

FIG. 5 is a flowchart showing an embodiment of an auto-bracketing photographing device according to the present invention.

FIG. 6 is a flowchart showing a modified example of an embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 7 is a flowchart showing a modified example of the embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 8 is a flowchart showing a modified example of an embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 9 is a flowchart showing a modified example of the embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 10 is a flowchart showing a modified example of an embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 11 is a flowchart showing a modified example of the embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 12 is a block connection diagram showing a modified example of the embodiment of the auto-bracketing photographing device according to the present invention.

FIG. 13 is a flowchart showing a modified example of the embodiment of the auto-bracketing photographing device according to the present invention.

[Explanation of symbols]

 1 Control Circuit 2 Setting Means 3 Display Means 4 Exposure Control Means 5 Film Feeding Means 6 Film End Detecting Means 10 Film Number Detecting Means 11 Control Circuit SW Switch

Claims (3)

[Claims] 1. An auto-bracketing photographing device having an auto-bracketing photographing means for photographing a plurality of times under varying exposure conditions, and a remaining amount detecting means for detecting a remaining amount of a recording medium, and calculating an appropriate exposure. An appropriate exposure calculation means and a photographing frame number setting means for setting the number of frames that can be photographed are provided, and the remaining amount of the recording medium detected by the remaining amount detecting means is set by the photographing frame number setting means. When the number is smaller than the number, the auto-bracketing photographing device is characterized in that photographing is performed first with the proper exposure calculated by the proper exposure calculating means. 2. When the number of frames is smaller than the number of frames set by the frame number setting means, the plurality of images are taken by changing the exposure condition after the images are taken by the proper exposure calculated by the proper exposure calculating means. The auto-bracketing photographing device according to claim 1, wherein the process is continuously performed up to the end of the recording medium. 3. When the number of frames is smaller than the number set by the shooting frame number setting means, the proper exposure calculated by the proper exposure calculation means is obtained when a plurality of shots under different exposure conditions are continuously performed. The auto-bracketing photographing apparatus according to claim 2, wherein photographing other than the above is continuously performed up to the end of the recording medium.