JP2948919B2 - Multiple exposure camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple exposure camera, and more particularly, to a multiple exposure camera that performs two exposures on the same film surface by one release operation.

[0002]

2. Description of the Related Art In FIG. 10 showing an example in which a person 51 is photographed at night with a night view, for example, a bridge 52 as a background, a slow shutter speed is required to properly photograph the person 51 and photograph the bridge 52 as a night scene. In this case, so-called slow synchro shooting in which the strobe light 54 mounted on the camera emits light is effective. In this case, the exposure to the person 51 is performed by strobe light emission, and the exposure to the back bridge 52 is performed by long-time exposure at a slow shutter speed.

[0003]

By the way, in the case of FIG. 10 in which night photographing of the person 51 is performed by slow synchro with the bridge 52 in the background, in order to focus on both the person 51 and the bridge 52 in the back. It is necessary to narrow down the aperture to bring both of them into the depth of field of the camera, but there is a difficult problem, and this will be described in detail below with reference to FIG.

Generally, the distance to the person 51 and the strobe 5
If GN0 of 4 is determined, the available aperture value of the camera is necessarily limited. When the aperture value is determined, the depth of field is determined based on the focal length of the photographic lens being used.

It is examined whether or not the person 51 located at a finite distance and the back bridge 52 located at the ∞ distance are simultaneously focused at the determined depth of field. In order to keep the subject at a distance within the depth of field, the following (1) described in the Camera Technology Handbook
In order to satisfy the expression, it is necessary to set the position of the subject at a finite distance to L0 or less.

[0006]

Here, Lo: when the lens is set so as to focus on a distance of 2 × Lo, a distance such that Lo to ∞ becomes the depth of field f: focal length of the photographing lens FNo: distance of the photographing lens Brightness δ: Allowable circle of confusion When calculating Lo with δ = 1/30 mm in the above equation (1), the result is as shown in FIG. Suppose the camera's strobe G
Assuming that N0 is GN0 = 20 and the focal length f of the photographing lens is f = 35 mm, and the distance to the person who is the main subject is 5 m, the aperture to be set if the ISO100 film is used is GN0 = FNo × subject distance... (2) FNo = 4. This point becomes the position of a point P ₁ on the Figure 11, focusing on both the f = 35 so located above the straight line l ₁ corresponding to (mm), Bridge 52 is a person 51 and the background is a main object The photographing lens can be set so as to match. next,
The focal length f of the imaging lens to be enlarged the person 51 is the main object, when you change f = 50 to (mm), unless changed aperture to the point of the point P ₂ in FIG. 11, the back Ohashi 52 And the person 51 cannot be put into the depth of field. The aperture at this time is
Since it is approximately 8, if the strobe GN0 is not set to 40 according to the above equation (2), the exposure of the person 51 will be under.

However, since the GN0 of the strobe is assumed to be 20, the story will change if there is an external strobe. In this way, since the GN0 of the strobe is limited, if changing the aperture is not allowed, The means to take is person 5
1 away from the camera and into the depth of field.
To a point 1 point P ₃ is to shift the position of the person 51.

Since the subject distance at this time is about 10 m, if the focal length of the photographing lens is changed with the intention of enlarging the person 51 who is the main subject, the object field must be kept at a distance greater than this change. As long as you can not fit within the depth and the strobe GN0 has enough room,
The intention to magnify and photograph the main subject will be shattered.

As described above, when the aperture setting value is limited because the subject is dark, the degree of freedom in controlling the depth of field is lost and the usable focal length of the lens is extremely limited. Become. In the above example, the comparison was made between the case where the focal length of the photographing lens was 35 mm and the case where the focal length was 50 mm.
As the focal length further increases, as shown in FIG. 11, such difficulties increase even more exponentially.

That is, in slow synchro photography of a person with a night view in the background, it is difficult to perform normal automatic exposure and automatic focus control because the subject brightness is low. Therefore, a special operation mode, for example, a double exposure mode is set for the camera,
When this mode is selected by the user, the exposure condition of the camera is fixed to the aperture value and the aperture value effective for night view shooting, and the shooting lens is set to a specific position to support night view shooting. (See JP-A-2-206326 and JP-A-2-217710). The photographing means by the double exposure will be described below with reference to FIGS.

[0012] As shown in FIG.
Is focused on a person 51 at a finite distance, which is the main subject,
Flash photography is performed at the fastest exposure time at which the flash can be tuned. Since the exposure time in the first flash photography is extremely fast, the bridge 52 in the back is hardly exposed, and the image of only the person 51, which is the main subject, is formed on the film surface 5.
6 is formed.

Next, without winding up the film, FIG.
As shown in (B), the photographing lens 55 is focused on the position ∞, and the bridge 52 (hereinafter, referred to as a second subject) as a background is not exposed to strobe light so that proper exposure can be achieved. The low-speed exposure operation is performed at the exposure time. In the second exposure, there is almost no reflected light from the person 51, which is the main subject, so that a person (hereinafter, referred to as
An image is formed in a portion excluding the first subject (referred to as a first subject). Thereafter, the film is wound up to prepare for the next photographing.

In the conventional photographing operation using the double exposure,
Since it has an effect of synthesizing the respective photographs of the first subject and the second subject, it is possible to achieve the initial purpose in night view shooting. However, if such a shooting operation is performed by a conventional camera capable of multiple exposure, a very complicated operation is required, and the shooting time cannot be shortened. You will be tired.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem, and to automatically and quickly take a picture in which both the first subject and the second subject are in focus during night view shooting. An exposure camera is provided.

[0016]

A multi-exposure camera according to the present invention is suitable for a strobe device and a short-distance object.
After driving the taking lens to the focus position,
The strobe light from the strobe device
First exposure control means for performing an operation and focusing on a long-distance subject
Drive the shooting lens to the position
Second exposure control means for performing an exposure operation without performing irradiation
If, comprising a setting means for selecting one from a plurality of shooting modes including a night view photographing mode suitable for night view imaging, the night
When the landscape shooting mode is set, one release
The first exposure control means and the second exposure
Operate the control means independently, and
It is characterized in that exposure is performed twice .

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing embodiments of the present invention,
The concept of the present invention will be described with reference to FIG . According to the present invention
Double exposure camera is the same film by one release operation
A camera that performs two exposures on a surface and uses a focusing lens
A lens driving means 1 for moving back and forth in the optical axis direction;
Exposure unit that performs exposure operation by controlling aperture and aperture
2 and a flash on the subject in conjunction with the exposure means 2.
A flash light emitting means 3 for projecting light;
At least the focus lens position, aperture value,
Setting means 4 for setting the exposure time and exposure time;
Of the second subject located farther than the first subject
About at least the position of the focusing lens, aperture value and
A second setting means for setting an exposure time;
In shooting a moving object, the set value of the first setting unit 4 is set.
At least the focusing lens by the lens driving means 1
Position Adjusting Operation of Flash and Flash Lighting Means 3 and Exposure Means
2 and the exposure operation of the second subject is performed.
In the above, a small value is set according to the set value of the second setting means 5.
At least the position adjustment of the focusing lens by the lens driving means 1
Control for executing the adjustment operation and the exposure operation by the exposure means 2.
Control means 6 . Hereinafter, the present invention will be specifically described with reference to the drawings. FIG. 2 is a block diagram of a multiple exposure camera according to the first embodiment of the present invention. A microcomputer (hereinafter abbreviated as μCOM) 37 performs sequence control of the entire system and various operations.

The display circuit 38 displays various operation modes and displays exposure data calculated by the μCOM 37. The release switch 39 is a two-stage stroke switch. The μCOM 37 executes a distance measurement, a photometric operation, and the like with a first-stage switch signal, and performs an exposure operation with a second-stage switch signal.

The setting switch 40 is used for setting the operation mode of the camera, exposure conditions, and the like. The film sensitivity reading circuit 41 reads the DX code of the film and sends an Sv signal to the μCOM 37.

The storage means 42 is a non-volatile memory for storing data such as the number of frames of a film and the operation mode of the camera which need to be stored even when the power is turned off.

The photometric processing circuit 29 detects the brightness of the subject from the photocurrent of the light receiving element such as the SPD 30 and converts the Bv signal into a μ value.
Send to COM37.

The film control means 34 is used for controlling automatic winding and rewinding of the film 32. The shutter control unit 35 controls the front curtain and the rear curtain of the focal plane shutter 31 based on the signal of the μCOM 37. Further, the mirror control unit 33 controls the up / down operation of the quick return mirror 25.

The focus detecting means 36 sends data necessary for detecting the amount of defocus to the μCOM 37. Then, the μCOM 37 calculates the amount of movement of the focus lens 15 necessary for focusing based on this data, and detects the amount of movement of the focus lens 15 with the first encoder 13 through the motor control circuit 21 while detecting the amount of movement. 19 is controlled.
When the user operates a PF (power focus) operation switch which is one of the setting switches 40, the μCOM 37 controls the first motor 19 to drive the focus lens 15 based on the operation signal.

PZ which is one of the setting switches 40
When the user operates the (power zoom) operation switch, the μCOM 37 controls the second motor 20 via the motor control circuit 21 based on the operation signal, whereby the zoom lens 16 moves in the optical axis direction. , The focal length of the taking lens changes. Then, the μCOM 37 detects this focal length by the second encoder 14.

The aperture control means 24 controls the aperture 22 based on the Av value calculated by the μCOM 37.

The strobe control circuit 12 operates the booster circuit in accordance with the control signal of the μCOM 37 to accumulate electric charges necessary for light emission in the main capacitor of the strobe. When the emission signal is transmitted from the μCOM 37, the xenon tube 1
A trigger signal is given to 1 to cause a strobe light emission.

The operation of the embodiment constructed as described above will be described below with reference to the flowcharts shown in FIG.

FIG. 3 is a flowchart of a main flow mainly in the photographing mode in the first embodiment. When the power of the camera is turned on, the μCOM 37 (see FIG. 2) is reset by power-on and initialized.

In step A010, the setting switch 40
Is read, the operation mode of the camera is determined, and the operation mode is displayed by the display circuit 38. Note that the night view mode of the present invention is also set here.

In step A012, it is determined whether or not the mode is the night scene mode.
Step A014 when the mode is other than the night view mode
To each branch.

In step A014, the Bv value is read from the photometric processing circuit 29, and the Sv value is read from the film sensitivity reading circuit 41. Then, the Tv value and the Av value required for exposure are calculated from the Bv value and the Sv value and the lens focal length data obtained from the second encoder 14 according to the exposure mode of the camera, and the Tv value and the Av value are displayed. The information is displayed by the circuit 38 (step A016).

In step A018, the state of the release switch 39 is determined, and if the first stage of the release switch (hereinafter referred to as 1R switch) is on, step A0.
19, and if OFF, the flow branches to step A017. In step A017, the AF lock flag is reset, and the process returns to step A010. That is, when the 1R switch is off, only reading of the setting switch 40 and photometry are being executed.

In step A019, 1/0 of the AF lock flag is determined. If the flag is 1, that is, if the AF lock flag is set, since the distance measuring operation has been completed and the object is in focus, the process proceeds to step A032. Branch. In this case, in order to execute the distance measuring operation again, it is necessary to turn off the 1R switch and reset the AF lock flag in step A017. When the 1R switch is turned on, AF
Since the lock flag is reset, the flow proceeds to step A020 and the subsequent steps to perform the distance measuring operation.

When the AF lock flag has been reset and the flow branches to step A020, the amount of focus shift is calculated based on the data obtained from the focus detection means 36.

In step A022, it is determined whether or not focus detection is possible. When the subject is dark or the contrast is low, the focus may not be detected, and the process may branch to step A024. Then, this step A024
Then, the display circuit 38 displays that distance measurement is impossible, and then jumps to step A042 to reset the night view mode.

On the other hand, if the focus can be detected in step A022, the flow branches to step A026. In this step A026, in-focus / out-of-focus is determined with respect to the defocus amount in consideration of the focal length of the taking lens, the aperture value, and the like.

If it is determined in step A026 that the image is out of focus, the flow branches to step A028, in which the amount of defocus is converted into a driving amount of the motor, and focusing is performed based on the driving amount of the motor and the output of the first encoder 13. The drive of the lens 15 is controlled. After the control ends, it is necessary to determine whether or not the lens is in focus. Therefore, the process jumps to step A010 to execute the focus detection routine again.

On the other hand, if it is determined in step A026 that the object is in focus, the AF lock flag is set, and then the display circuit 3
(Steps A027, A03)
0). In step A032, the state of the release switch 39 is determined again. If the second stage of the release switch (hereinafter referred to as 2R switch) is on, step A0 is executed.
34, and if OFF, the flow branches to step A010.

In step A034, it is determined whether or not the mode is the double exposure night view mode.
The process branches to 040 to call a subroutine "exposure control" described later with reference to FIG. When this subroutine ends, the process proceeds to step A042, and in the case of the night scene mode, the mode is reset.

The operation of the μCOM 37 when an operation mode other than the night view mode is selected has been described above. Next, the operation in the night view mode will be described.

If it is determined in step A012 that the night view mode is set, the flow branches to step A050 to determine whether the night view mode is the double exposure night view mode. The double exposure night view mode is an operation mode according to the gist of the present invention.

If the mode is not the double exposure night view mode, the flow branches to step A054 to execute the normal night view mode. That is, the Tv value and the Av value suitable for night view photographing are calculated in consideration of the Sv value obtained from the film sensitivity reading circuit 41.

In step A056, the lens is driven and controlled to a position advantageous for night view photographing without performing distance measurement. Then, the state of the release switch 39 is read out, and if both the 1R switch and the 2R switch are on (step A058,
A060), and proceeds to step A040 to execute a subroutine "exposure control".

If it is determined in step A050 that the mode is the double exposure night scene mode, the flow advances to step A052 to determine the exposure conditions in the first exposure step and the second exposure step.

That is, in the first exposure step, the strobe is fired to expose the first subject at a finite distance, so that the Tv value is set to the maximum value at which the shutter can synchronize with the strobe. . It is assumed that the flash control method is flashmatic. Therefore, A
The v value is determined in step A038 after the distance measuring operation is completed.

In the second exposure step, since the second subject at the ∞ distance is exposed, the Av value is set to an open value, and the Tv value is set to an appropriate value lower than the synchro speed. This open value is set in conjunction with the ISO sensitivity to a fixed value so that the background night scene can be clearly captured.

In step A053, a charge start signal is sent to the flash control circuit for flash photography required for the first exposure step. Next, the process jumps to step A018. Since the distance measurement operation from step A018 to step A032 has already been described, description thereof will be omitted here.

The description will be continued from the state where the distance measuring operation is completed and the 2R switch is turned on. If it is determined in step A034 that the mode is the double exposure night view mode, the flow advances to step A036 to determine whether or not the strobe can emit light. If the charging of the main capacitor has not been completed, the process stands by at step A036 until the charging is completed.

In step A038, the first time at the end of ranging is determined.
The subject distance is detected from the data of the encoder 13 and the Av value at the time of flash emission is calculated from the guide number and the subject distance. Then, the process jumps to step A040.

FIG. 4 shows step A04 in FIG.
0 is a flowchart showing the details of the subroutine “exposure control” of step 0. In step B010, the quick return mirror 25 is mirrored up through the mirror control means 33. In step B012, the previously calculated Av
The diaphragm 22 is set via the diaphragm control means 24 based on the value.

In step B014, the already calculated Tv
Based on the value, the timer inside the μCOM 37 is started for the time reproduction. In step B016, the front curtain of the focal plane shutter 31 is started via the shutter control means 35.

In step B018, the shutter speed is 1 / the highest shutter speed that can be synchronized.
It is determined whether it is longer or shorter than 100 (seconds).

If the shutter time is shorter than 1/100 (second), the strobe cannot be used.
To determine whether the timer has expired. If the timer has not expired, the above step B01 is performed.
Branching to step B8, if the timer has expired, step B02
Go to 6 to start the second curtain.

In the above step B018, 1/100
If it is determined that Tv is longer than (seconds), step B02
At 0, the X switch is read. This X switch
This switch is built in the shutter and is used to match the flash emission timing with the previous timing of the shutter.

If the X switch is on, step B022
Proceed to. In step B022, if the main capacitor of the strobe has been charged, a light emission signal is sent to the strobe control circuit to cause the strobe to emit light.

When the start of the second curtain is completed in step B026, it is determined in step B028 whether or not the double exposure night scene mode is selected. If this mode is selected, the above steps B016 to B026 correspond to the first exposure step, and the values set for the first exposure step are used as the Av and Tv values at this time.

On the other hand, if the double exposure night view mode is not selected, the second exposure step is unnecessary, and
The process proceeds to 044, B046, where the mirror 25 is lowered and the aperture 22 is returned to the open state. Then, Step B04
At 8, the shutter control means 35 charges the shutter for the next photographing. Further, in step B050,
One frame of film is wound up through the film control means 34.

In step B052, the film counter is counted up and displayed by the display circuit 38, and the count value is stored in the storage means 42. The "exposure control" subroutine ends when the winding operation is completed.

Returning to step B028, when the double exposure night scene mode is selected, steps B030 to B042 corresponding to the second exposure step are executed. At this time, the values set for the second exposure step are used as the Av and Tv values.

In step B030, a shutter charge is performed to expose again. In step B032, the lens is set to the position ∞ for the reason described later so that the subject 被 写 体 is focused. Hereinafter, step B0
In steps 34 to B042, the aperture is set again, the timer is started, and the first curtain and the second curtain of the shutter are controlled.

In the flow chart shown in FIG. 4, the reason why the mirror does not move down from the first exposure step to the second exposure step is that there is a fear that camera shake may occur due to the vibration caused by the mirror up / down. is there.

Normally, mirror control, shutter charge, aperture control, and the like are controlled in a series of sequences due to the mechanism of the camera.
It is desirable that they can be controlled separately. Therefore, a lens shutter without a quick return mirror is more advantageous in this regard.

Here, the reason why the distance measuring operation is performed in the first exposure step and the lens is set to で は in the second exposure step in the description of the operations of FIGS. 3 and 4 will be described below.

Basically, the distance measuring operation may be performed in the second exposure step. However, if the distance measuring operation is postponed, the distance measuring operation is performed when the process shifts from the first exposure step to the second exposure step. Since a time lag occurs due to the distance, the double exposure cannot be performed quickly.

In particular, the mainstream T lens for single-lens reflex cameras
In the TL method, since a distance measurement loop is repeated several times until the lens reaches a focusing point, a problem of a large time lag occurs. Further, when the condition of the subject is poor, the distance measurement may not be performed.

At this time, there occurs such a problem that the first exposure step has been completed but the process cannot be shifted to the second exposure step. If the distance measurement operation is to be performed before the second exposure step, it is necessary to set the lens to the pan focus position when the distance measurement is impossible and to forcibly execute the second exposure step.

Next, a multiple exposure camera according to a second embodiment of the present invention will be described with reference to the flowcharts of FIGS.
In the first embodiment, the photographing conditions in the first exposure step and the second exposure step are automatically set by the μCOM 37. However, in the second embodiment, the operator of the camera is required to perform the first and second exposure steps. The difference is that shooting conditions in the exposure step can be set freely. That is, when the focus position of the second subject in the back is not ∞, when the subject cannot be AF, or when it is desired to intentionally set the exposure amount,
The photographing conditions can be determined by the operator's free will.

FIG. 5 is a flowchart of the main flow mainly in the photographing mode in the second embodiment.
When the power of the camera is turned on, the μCOM 37 is power-on reset and initialized.

If it is determined in steps D010 and D012 that the continuous shooting double exposure mode is set based on the setting position of the setting switch 40, the flow branches to step D050. Otherwise, the flow branches to step D014. This step D01
The operations from Step 4 to Step D040 are the same as Steps A014 to A040 in FIG. 3 in the first embodiment, and a description thereof will be omitted.

Step D050 described later with reference to FIG. 6A.
In the subroutine of "set photographing conditions", the photographing conditions of the first exposure step and the second exposure step set by the operator of the camera are input to the storage means connected to the μCOM 37.

In step D052, it is determined whether or not strobe light emission is required during shooting conditions. If strobe light emission is required, a signal for charging the main capacitor is sent to the strobe control circuit in step D054. I do.

In steps D056 and D058,
The state of the release switch 39 is read, and if the 1R switch and the 2R switch are on, the process proceeds to step D060.
If either or both of the switch and the 2R switch are off, the flow jumps to the first step D010 of this flow.

In step D060, it is determined whether or not strobe light emission has been requested. If so, in step D062, the process waits until charging of the main capacitor of the strobe light is completed. Thereafter, the process proceeds to step D040 described later with reference to FIG. 7, and the film is exposed under the set photographing conditions.

FIG. 6A shows step D0 in FIG.
50 is a flowchart illustrating details of a subroutine “Shooting condition set” of No. 50. In FIG. 6A, 2
A description will be given on the assumption that the long-time exposure for the second subject at the ∞ distance is performed in the first shooting operation in the multiple exposure, and the strobe shooting for the first subject at the finite distance is performed in the second shooting operation.

In step E010, the setting switch 40
(See FIG. 2), the ON / OFF of the MEMO switch is determined. When the MEMO switch is pressed, the state of the MEMO mode is determined in steps E012 and E016, and the process branches to perform the respective processes.

First, if MEMO flag 1 is 0, non-ME
The mode is determined to be the MO mode, and the MEMO flag 1 is set (step E014). As a result, the camera enters the first shooting condition memory mode of the double exposure. In the case of the double exposure mode, this shooting is for the second subject. Step E0
At 46, when the MEMO flag 1 is set, a display such as that shown in FIG. 6B is continuously performed in order to notify the photographer of the first photographing condition memory mode.

Next, in steps E012 and E016, the first
If it is determined that the mode is the shooting condition memory mode, then step E
In step 018, data of the first shooting condition, that is, shutter speed, aperture, availability of strobe, zoom focal length, focusing lens position, and the like are stored in the R in the CPU.
It is stored in a first memory formed in an AM, E ² PROM, or the like. Then, in step E020, the MEMO flag 2 is set, and the camera enters a second shooting condition memory mode of double exposure. In step E046, the display shown in FIG. 6B, for example, is flickered to notify that the second photographing condition memory mode has been entered by using this flag.

Finally, when it is determined that the current mode is the second shooting condition memory mode, the second shooting condition is stored in the second memory as in the first shooting condition memory mode (step E022). However, since the second exposure is for photographing a person, the Tv value is fixed to the synchronization speed, the flash is forcibly fired, and these two cannot be set by the photographer.

Then, the MEMO flag 1 and the MEMO flag 2 are cleared to return to the non-MEMO mode, and the display shown in FIG. 6B disappears.

Data is previously set in the first and second memories (for example, a predetermined value is written at power-on, or if the memory is an E ² PROM, the previously stored data remains. Therefore, double exposure photographing can be performed without performing the above-described data setting processing. Conversely, double exposure shooting may be prohibited until the data setting process is performed.

In each routine after step E026,
ZOOM, FOCUS, Tv, Av of the setting switch 40
, FLASH and other switches to control the zoom focal length,
Focusing lens position, shutter speed, aperture,
Change data such as the availability of flash light. And
There are three memory areas for storing the encoder output for the zoom and focusing lens positions, the shutter speed, the APEX data (Tv, Av) for the aperture, and the flash enable flag for the presence or absence of flash emission. Are prepared one by one. That is, the first and second memories for double exposure and the third memory for normal photographing.

Steps E028, E032, E036,
In E044, the data in the third memory is changed, and in steps E018 and E022, the contents of the third memory are saved in the first memory. Therefore, 2
The setting of the photographing condition for the double exposure can be easily executed by combining the operation of the MEMO switch and the usual photographing condition setting operation. In step E046, the contents of the third memory are displayed in real time in addition to the display shown in FIG. 6B.

As described above, the sub-routine of the "photographing condition set" has been described. The order of storing data in the first and second memories may be changed.
May be shared.

FIG. 7 is a flowchart showing step D04 in FIG.
9 is a flowchart showing details of a subroutine “exposure control” of “0”. In step F010, it is determined whether or not the continuous shooting double exposure mode is selected. If the continuous shooting double exposure mode is not selected, normal shooting is performed. Therefore, the subroutine "exposure 1" in step F034 is executed. To return. If the continuous exposure double exposure mode is selected, the process proceeds to step F012, and the photographing conditions of the first exposure step are read from the storage unit.

In steps F014 and F016, the aperture value Av of the first exposure and the shutter speed value Tv are set to Av1 and Tv1, respectively.

In step F018, the second encoder 1 is moved to the focal length of the lens corresponding to the set zoom value.
4 (see FIG. 2) to control the second motor 20. In step F020, the first motor 19 is controlled based on the output of the first encoder 13 so as to focus on the set subject distance.

After setting the photographing conditions, the first exposure in the first exposure step is executed in step F022.

In step F024, the second means
The photographing conditions of the exposure step are read. The camera state is reset in steps F026 to F032 in accordance with the shooting conditions. Then, in step F034, the second exposure is executed, and the double exposure ends.

FIG. 8 is a flowchart showing step F02 in FIG.
2 is a flowchart showing details of subroutines “exposure 2” and “exposure 1” of F034. When the "exposure 2" subroutine is called, the windup prohibition flag is set in step G010, and is not set in the call from "exposure 1". Windup prohibited flag is 2
This flag is for exposure control at the time of heavy exposure, and if this flag is set, the processing of mirror down, winding up, and film counting after the end of shutter control is not executed. That is, it is provided for the first exposure control of the double exposure.

At Step G012, the quick return mirror 2 is controlled via the mirror control means 33 shown in FIG.
Mirror 5 up. In step G014,
The aperture 22 is set via the aperture control means 24 based on the Av value already calculated or set by the operator.

In step G016, it is determined whether or not the shutter control is a valve.
Branching to 0 starts the first curtain of the focal plane shutter 31. Then, in step G032, 2
The R switch is monitored, and the start of the second curtain (G040) is suspended until the R switch is turned off. Therefore, the shutter remains open while the 2R switch is on.

Returning to step G016, if the shutter control is not a valve, the flow advances to step G018 to start a timer inside the μCOM 37 for time-based reproduction based on the Tv value already calculated or set by the operator.
Then, in step G020, the first curtain is started.

In step G022, it is determined whether the shutter time is longer or shorter than 1/100 (second).
If the time is shorter than 100 (seconds), the strobe cannot be used, so the flow branches to step G028 to determine whether or not the timer has expired. If the timer has not expired, the process returns to the step G022.
Branch to 040 to start the second curtain.

In step G022, 1/100 (second)
If it is determined that Tv is longer, the process proceeds to step G024 to read the X switch. If the X switch is on, the process proceeds to step G026, and if the shooting condition includes strobe light emission, a light emission signal is sent to the strobe control circuit.

When the start of the second curtain is completed in step G040, it is determined in step G042 whether a windup inhibition flag is present. If the prohibition flag has been reset, the mirror is moved down in step G044. Then, the aperture is returned to the open state (step G046),
Charge the shutter to expose again (step G
048).

At step G050, the presence or absence of the windup prohibition flag is determined. If the flag is set, the flag is reset and the process returns (step G060). On the other hand, if the flag is reset,
In steps G052 and G054, the film is wound up, the counter is counted up, the count display is changed, and the routine returns.

In the second embodiment, an example has been shown in which double exposure is automatically executed in accordance with the conditions set by the operator.
It is possible to develop multiple exposures over multiple exposures.

The functions of the first and second embodiments are summarized as shown in FIG. That is, the automatic double exposure means 45 for performing double exposure is based on the two set photographing conditions.
The first exposure step and the second exposure step are continuously performed.

In the first exposure step, the first exposure step executing means 46 automatically adjusts the focus of the first object at a finite distance, and then emits a strobe light at a high speed. Expose the subject properly.

In the second exposure step, the second exposure step executing means 47 sets the lens to the position ∞ so as to focus on the second object at the distance 、, and then sets the low-speed time without emitting the strobe light. Exposure.

The photographing conditions in the first exposure step and the second exposure step are not only automatically set by the camera as shown in the first embodiment, but are also photographed as shown in the second embodiment. Can be manually set by the user.

The order of photographing the first and second subjects is as follows.
The above may be reversed and is not specified.

According to the above-mentioned embodiment, by automatically and continuously performing the double exposure which has conventionally been manually performed by the operator, it is possible to capture a scene which is difficult to capture. In addition, since the first exposure condition and the second exposure condition can be individually set by an operator to perform double light emission, it is possible to cope with a creative photographing, and special photographing conditions such as night scene photographing. Is an effective photographing means.

[0104]

According to the present invention, as described above, according to the present invention, night
When shooting a landscape, a strobe device according to the output of the focus detection means
Light emission is controlled, and multiple exposures are performed by one release operation.
It can be performed. In addition , at the time of photographing a night scene, a first subject composed of a person or the like at a finite distance is photographed by a first subject.
In accordance with the set value of the setting means, at least the operation of adjusting the position of the focusing lens by the lens driving means and the exposure operation by the flash light emitting means and the exposing means are performed. According to the setting value of the second setting means, at least the operation of adjusting the position of the focusing lens by the lens driving means and the exposure operation by the exposing means are performed. A remarkable effect of automatically and quickly taking a focused photograph is exhibited.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a multiple exposure camera according to the present invention.

FIG. 2 is a block diagram of a multiple exposure camera showing a first embodiment of the present invention.

FIG. 3 is a flowchart of a main flow mainly in a photographing mode in the first embodiment.

FIG. 4 is a flowchart showing details of a subroutine “exposure control” in FIG. 3;

FIG. 5 is a flowchart of a main flow focusing on a shooting mode in a second embodiment.

FIG. 6A is a flowchart showing details of a subroutine “photographing condition set” in FIG. 5; B is a display example for notifying the photographer of the photographing condition memory mode.

FIG. 7 is a flowchart showing details of a subroutine “exposure control” in FIG. 5;

FIG. 8 shows a subroutine “exposure 2” in FIG.
9 is a flowchart showing details of “exposure 1”.

FIG. 9 is a block diagram summarizing the functions of the first and second embodiments.

FIG. 10 is a perspective view showing an example in which a person is photographed at night with a night view in the background according to the depth of field.

FIG. 11 is a diagram showing the relationship between the F number of the camera and the depth of field.

FIGS. 12A and 12B are diagrams illustrating an example in which a person is photographed at night with a night view as a background by double exposure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Lens drive means 2 ... Exposure means 3 ... Flash light emission means 4 ... First setting means 5 ... Second setting means 6 ... Control means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G03B 15/05 G03B 7/00-7/28

Claims (1)

(57) [Claims] 1. A photographing lens is driven to a position where a flash device and a subject at a short distance are focused.
After that, the subject is strobed from the strobe device
First exposure control means for irradiating light to perform an exposure operation, and a photographing lens driven to a position where a long-distance subject is focused.
Thereafter, the exposure operation is performed without performing the above-described strobe light irradiation.
Cormorants and second exposure control means comprises setting means for selecting one, a plurality of photographing modes including a night view photographing mode suitable for night view imaging, in a state where the night view photographing mode is set, once of
The first exposure control means and the second exposure control means respond to a release operation.
The exposure control means of the same film
A multi-exposure camera characterized in that a surface is exposed twice .