JP3348962B2 - 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 camera having an electronic viewfinder for confirming a subject image.

[0002]

2. Description of the Related Art Conventionally, in an imaging device such as a camera,
Various techniques have been proposed for displaying a subject image with an electronic viewfinder and allowing the user to observe the image. For example, Japanese Patent Application Laid-Open No. Sho 60-190077 discloses a technique characterized in that a part of photographing light is formed on an image sensor and an image equivalent to a subject image photographed on a film is confirmed on a monitor. It has been disclosed.

[0003]

However, according to the technique disclosed in Japanese Patent Application Laid-Open No. S60-190077, when the sensitivity of the film is different from the sensitivity of the imaging device, the shutter speed of the film and the electronic shutter speed of the imaging device are different. Therefore, there is a problem that an image different from the subject image actually photographed on the film is reproduced on the monitor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to make the electronic shutter speed and the film shutter speed the same when the film sensitivity and the imaging element sensitivity are different. Another object of the present invention is to make the luminance on the monitor appropriate.

[0005]

In order to achieve the above object, a camera according to the first aspect of the present invention converts an object image into an electronic image.
Monitor display on the child monitor and fill the
Monitor subject images on cameras that can expose
Image sensor that generates signals for exposure to the film
Exposure control to determine aperture value and shutter speed
Control means, the film sensitivity, the aperture value, and the
The above-mentioned imaging element is selected according to the exposure density determined by the
The charge accumulation state of the wafer is divided into several times during film exposure.
By opening the electronic shutter intermittently, the electronic shutter
The time from when the shutter opens to when the electronic shutter closes last
Control to be approximately equal to the shutter speed of the film.
And control means for controlling. Departure
The camera according to the second aspect of the present invention comprises:
Display on the monitor and subject image can be exposed on film
A flash device and a subject image
Imaging device for generating a signal for controlling
The amount of strobe light required for proper exposure
Light, and only when a part of the light is emitted
Control means for opening a shutter.
You.

[0006]

[0007]

[0008]

That is , in the camera according to the first aspect of the present invention ,
Signal for monitoring subject image generated by image sensor
Is done. Then, the film is exposed to the film by the exposure control means.
The aperture value and shutter speed for light emission are determined,
By the control means, the film sensitivity and the aperture value and the
The above shooting is performed according to the exposure density determined by the shutter speed.
The charge storage state of the image element is divided into multiple times during film exposure.
By opening the electronic shutter intermittently, the electronic shutter
From when the shutter opens to when the electronic shutter closes last.
So that the time is approximately equal to the film shutter speed
Is controlled. In the camera according to the second aspect of the present invention,
Signal for monitoring subject image generated by image sensor
Required for proper exposure of the film by control means.
The flash output is divided into multiple flashes, and
The electronic shutter of the image sensor is opened only during part of the light emission
You.

[0009]

[0010]

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the camera according to the first embodiment of the present invention. In FIG. 1, two-group positive and negative zoom lenses 1, 2 and a stop 3 for controlling the amount of light and a half mirror 4 are arranged on the optical path of the subject image. A field lens 7 ', an imaging lens system 7, and an image sensor 8 are arranged on the road. The diaphragm 3 is disposed between the zoom lenses 1 and 2, and the half mirror 4 is disposed at an angle of 45 degrees with respect to the optical axis of the subject light, and reflects substantially half of the subject light. And penetrate the other half.

A focal plane type shutter 5 and a silver halide film 6 are arranged on the optical path of the light transmitted through the half mirror 4. Note that the field lens 7 'is disposed near a position which is approximately the same as the film surface, and is for allowing the light beam to enter the imaging lens 7 without being blocked. Further, the diagonal length of the screen of the silver halide film 6 is 30 to
The image pickup surface of the image pickup device 8 is 1
Since it is 0 mm or less, the imaging optical system is a several-fold reduction system.

The output of the image sensor 8 is connected to the input of a preamplifier 9, and the output of the preamplifier 9 is connected to the input of a monitor 12 via a signal processing circuit 10 and a monitor driving circuit 11. The output signal of the image sensor 8 is amplified by a preamplifier 9, subjected to predetermined processing by a signal processing circuit 10, input to a monitor 12 via a monitor driving circuit 11, and an image is displayed on the monitor 12. You.

The output of the preamplifier 9 is also connected to the input of a band-pass filter (BPF) circuit 13. The output of the BPF circuit 13 passes through an A / D conversion circuit 14, a selection circuit 15, and an AF detection circuit 16. Is connected to the input of the AF control circuit 17. After the high frequency component of the output signal amplified by the preamplifier 9 is extracted by the BPF circuit 13 and converted into a digital signal by the A / D conversion circuit 14, the necessary signal on the screen is selected by the selection circuit 15. Only the appropriate region (usually the center of the screen) is selected, and the sum is obtained by the AF detection circuit 16. Then, the AF control circuit 17
Accordingly, the point at which the output of the AF detection circuit 16 becomes maximum is detected while scanning the lens 1 for focus adjustment. At this time, the AF control circuit 17 detects a focus point using the lens drive circuit 18 and the lens position encoder 19.

The output of the preamplifier 9 is a BPF circuit 20
The output of the BPF circuit 20 includes an A / D conversion circuit 21, a selection circuit 22, and an AE detection circuit 23.
Is also connected to the input of the AE operation circuit 25 via the.
Only the exposure signal is extracted from the signal amplified by the preamplifier 9 by the BPF circuit 20, converted into a digital signal by the A / D conversion circuit 21, and then selected by the selection circuit 22. Only the signal is passed, the sum is obtained by the AE detection circuit 23, and the average value is output to the AE calculation circuit 25.

The AE calculation circuit 25 calculates a predetermined aperture value AV and a shutter speed TV for giving proper exposure to the film 6 based on the film sensitivity information of the DX reading circuit and the output of the AE detection circuit 23. Ask for. The relation is: EV = AV + TV = BV + SVF (1) In the equation (1), BV is an apex value of the subject luminance output from the AE detection circuit 23,
SVF is the apex value of the ISO speed of the film.
The output of the AE arithmetic circuit 25 is connected to the inputs of an aperture control circuit 26 and a shutter control circuit 27, and the aperture value AV and shutter speed T calculated by the AE arithmetic circuit 25 are used.
Aperture control circuit 26 and shutter control circuit 27 based on V
Works. An output of the signal processing circuit 10 is connected to an input of a memory 29 via an A / D conversion circuit 28. The output of the memory 29 is supplied to the D / A conversion circuit 3
0 is connected to the input of the monitor drive circuit 11. The output of the signal processing circuit 10 is converted into a digital value by the A / D conversion circuit 28 and stored in the memory 29. In the memory 29, a subject image can be stored in synchronization with the timing at which the silver halide film 6 is exposed. Then, when the information is read from the memory 29,
After the digital signal is converted into an analog signal by the D / A conversion circuit 30, the digital signal is input to the monitor drive circuit 11, and an image is displayed on the monitor 12.

Here, the function of the correction circuit 31 will be described. When the film 6 is exposed, the aperture value AV and the shutter speed TV are determined. When the aperture value AV changes, pictures with different depths of field can be taken, and when the shutter speed TV changes, the way the subject blurs naturally also changes. Strictly speaking, the subject image reproduced when the silver halide film 6 is photographed on the monitor 12 has the aperture value AV,
The shutter speed TV must be faithfully reproduced.

Now, the subject image formed on the image sensor 8 is obtained by re-forming the primary subject image formed at a position approximately equal to the film 6 by the imaging lens 7, so that the aperture 3 is strictly speaking. The illumination is different from that of the film surface even when is open.
However, it is ignored here for the sake of simplicity.

That is, the sensitivity of the image pickup device 8 is set to SV
Assuming that C and SVF are almost equal, the same photographing lenses 1 and 2 are used, so that a predetermined aperture value is set, and the shutter speed and the light receiving element of the image sensor 8 are integrated for the same time (so-called electronic camera). (Shutter speed), and a subject blurring effect similar to the depth of field in both subject images. However, since the user uses films having various sensitivities, if both shutter speeds are always the same, one of the exposures becomes inappropriate. The correction circuit 31 operates in such a case to operate the imaging device 8.
The electronic shutter speed is approximated to the shutter speed of the film, and the exposure correction is instructed in post-processing.

The output of the correction circuit 31 is connected to the input of a strobe light emission circuit 36 via a light emission amount control circuit 35. The light emission amount control circuit 35 includes a strobe light emission circuit 36.
This is a circuit for outputting an arbitrary light emission amount to the circuit. Further, the output of the correction circuit 31 is also connected to the input of the amplification factor instruction circuit 41. The output of the amplification factor instruction circuit 41 is connected to the input of the prim 9, and the amplification factor instruction circuit 41 instructs the change of the amplification factor of the preamplifier 9 based on the instruction of the correction circuit 31.

The image sensor 8 includes an image sensor driving circuit 32
Is connected, but the image sensor driving circuit 32 is for controlling the light receiving integration operation of the image sensor 8. A digital amplifying circuit 33 is connected to the correction circuit 31. The digital amplifying circuit 33 is a circuit for digitally amplifying the image information content of the memory 29 when the exposure of the imaging device 8 is insufficient. is there.

The FM operation circuit 34 is a circuit for determining an aperture value AV and a strobe light emission amount GV which are appropriate from the output of the lens position encoder 19 when the strobe is used. The output of the FM operation circuit 34 is connected to the input of the correction circuit 31, and outputs the calculated aperture value AV and the amount of strobe light emission GV. Further, the FM operation circuit 34
Is also connected to the input of the aperture control circuit 26,
The output of the aperture control circuit 26 is connected to the aperture 3.

Further, a magnetic recording circuit 37 and a film feeding circuit 38 are connected near the film. The magnetic recording circuit 37 is for recording desired magnetic information on a magnetic recording layer provided outside the screen of the film, and the film feeding circuit 38 is a circuit for winding and rewinding the film. is there.

In addition, a zoom drive circuit 39 for changing the focal length of the zoom lenses 1 and 2 is connected to the zoom lenses 1 and 2, and a zoom encoder 40 for outputting focal length information is connected to the zoom lens 2. Have been. The output of the zoom encoder 40 is connected to the input of the zoom drive circuit 39.

The control circuit 42 includes the correction circuit 31,
Memory 29, monitor drive circuit 11, magnetic recording circuit 37,
Film feed circuit 38, shutter control circuit 27, zoom drive circuit 29, aperture control circuit 26, lens drive circuit 18
And controls the operation of each circuit.

Next, FIG. 2 is a diagram showing the structure of an interline type CCD constituting the image pickup device 8. As shown in FIG. 2, several hundred thousand photodiodes and a vertical transfer C
It is composed of a CD and a horizontal transfer CCD.

FIG. 3 is a diagram showing a detailed configuration of a CCD employing an embedded photodiode. This figure 3
In, the incident light becomes an electron-hole pair at the PN junction of the photodiode, and has a potential accumulated in the junction capacitance of the photodiode. The electric charges accumulated by the read signal to the read gate are simultaneously output to the vertical transfer CCD. Thereafter, as shown in FIG. 2, one row of the horizontal transfer CCD is output in synchronization with the clock pulse, and then the vertical transfer is performed for one pulse (one column).

The operation of the camera according to the first embodiment will be described below with reference to the flowcharts of FIGS.
When the power is turned on, the control circuit 42
1 is operated to display an image on the monitor 12. Image sensor 8
When the output is reproduced and the subject is moving, the display is performed as it is (step S1).

Subsequently, the AE detection circuit 23 is operated, and the AE calculation circuit 25 sets a monitoring integration time for performing the above-mentioned monitor display with proper exposure. This results in EV = AV0 + TVC0 = BV + SVC (2). That is, since the aperture 3 is open during monitor display, the aperture value AV0 and the electronic shutter time TVC0 suitable for it are set.
Is set (steps S2 and S3).

Here, as shown in FIG. 7, in the first embodiment, one field of signal is read out in 1/60 second. In the case of a video camera with an auto iris mechanism, the aperture value is adjusted so that the photocharge becomes appropriate in 1/60 seconds.

When the signal charge readout pulse is output in synchronization with the end of the vertical blanking pulse in which the transfer of the signal charge is not performed, the accumulated charges are simultaneously output from the junction capacitance of the photodiode to the vertical transfer CCD. Therefore, the charge becomes “0”.

Further, as described above, the electric charge output to the vertical transfer CCD repeats the vertical → horizontal → vertical transfer to 1
It is output as analog serial data from the signal output terminal of FIG. 2 over / 60 seconds.

In the camera of the first embodiment, since the aperture 3 is open, the electronic shutter speed is adjusted so that the signal charge has a proper integral value. In this figure, 1/120
A case of a second shutter speed (TVC0) is shown.

In this case, the signal read pulse is 1/60 in synchronization with the vertical blanking pulse as in the video camera.
Output every second. However, the photocharge accumulated before 1/120 second counted from the signal charge read pulse in reverse is C
Since the unnecessary charge sweeping pulse for sweeping to the CD substrate is continuously output, the accumulation of the photocharge is not executed. Therefore, the photocharge accumulation time, that is, the electronic shutter speed is 1/1.
20 seconds. However, it takes 1/60 second for one field to read the signal.

At the bottom of the figure, the electronic shutter speed is 1/40
Seconds are shown. Since 1/40 second is longer than 1/60 second, a signal readout pulse is output only once in two fields. In this case, the image signal for one field that is not output is lost. Therefore, it is a general so-called “slow shutter mechanism” that the image signal of the previous field is stored in the memory 29 and displayed. is there. That is, the image signal is output from the memory once every two times.

By the way, the exposure control during the monitoring is always executed in this manner, and the exposure control is performed for one second by half-pressing the release button (not shown).
Waiting for the output of the t release signal, and when the first release signal is output (step S4), AF control is executed by the AF control circuit 17 with the contents described above, and focusing on the monitor 12 is performed (step S5). .

Next, the control circuit 42 reads the film sensitivity information (SVF) by the DX reading circuit 24 (step S6), and activates the AE detection circuit 23 to activate the subject brightness BV.
Is obtained (step S7). Subsequently, the AE operation circuit 25
Is operated to perform the AE calculation, and the aperture value AV and the shutter speed TV are determined based on the above equation (1) (step S8). If it is determined that the shutter speed TV is lower than the predetermined value, the process proceeds to a strobe light emission sequence described later (step S9).

Subsequently, the sensitivity SVC of the image pickup device 8 is compared with the film sensitivity SVF. If the image pickup device 8 has a lower sensitivity or the same sensitivity, an apex operation expression of the image pickup device 8 is given by the following expression: EV = AV + TVc = BV + SVC ... In (3), TV is substituted for TVC. That is, the shutter speed TV of the film 6 is made to match the electronic shutter speed TVC of the image pickup device 8 (steps S10 to S10).
12).

Then, when the release button is completely pressed, 2n
When the d-release signal is output (step S13), both the film 6 and the imaging device 8 are exposed at the aperture value AV and the shutter speed TV. Then, at this time, the image information is stored in the memory 29 (steps S14 to S17).

Then, if SVC = SVF, that is,
If the sensitivities are the same (step S18), the stillness is displayed on the monitor 12 based on the image signal stored in the memory 29 (step S21).

On the other hand, when the sensitivity of the image pickup device 8 is lower (step S18), the stored digital data of the memory 29 is multiplied by 2 ^(SVF-SVC) times by the digital amplifier circuit 3.
3 (step S19), stores the image again in the memory 29 (step S20), displays a still image on the monitor 12 based on the stored information (step S21), and ends all the sequences. As a result, an appropriate subject image is always reproduced on the monitor 12.

Next, referring to the flowchart of FIG. 6, in step S10, the image sensor has higher sensitivity (SVC
> SVF) will be described.
In this case, an intermittent integration operation as shown in FIG. 8 is performed. That is, during the shutter time t2 (TV) of the film 6, t2
Is executed x times at intervals of t3. This is t1 = 1
Table 1 below shows a comparison between SVC and SVF for / 120 seconds.

[0043]

[Table 1]

During this intermittent integration, the transfer signal is not executed, and the light accumulation charge is output to the vertical CCD by the read pulse. In the case of SVC-SVF = 1, the vertical transfer starts after the eight integrations are completed. Thereby, the total of the actual integration time is 0.5 μs × 8 times = 4 μs = １ ／
Although it is 40 seconds, since the integration is continued for 1/120 second, the subject blurring of 1/120 second is displayed on the monitor (steps S48 to S59).

Next, with reference to the flow chart of FIG. 5, the sequence when the strobe is used in step S9 will be described. Here, only the points different from the sequence when the strobe is not used will be described.

In this sequence, first, an apex value DV of a subject distance is obtained by the zoom encoder 40 when the strobe is used, and an apex value GV of a necessary strobe guide number is obtained from AV + DV = GV + SVF (step S22, step S22). 23).

If SVC.ltoreq.SVF (step S24), a predetermined full-open shutter time TV is set and a flash exposure of only GV is given by the aperture of the AV, similarly to the above-described sequence without the flash. . After that, SVC
When the sensitivity is lower, the image data in the memory 29 is amplified by the digital amplifier 33 and displayed on the monitor (steps S25 to S36).

On the other hand, if SVC> SVF (step S24), a strobe guide number GVC required for the image pickup device 8 is obtained from AV + DV = GVC + SVC (5) (step S37). Then, GV '= GV-GVC (6) is obtained (step S38).

Subsequently, after the shutter 5 is first opened,
After exposing the film 6 by the light amount of V ', the integration of the image pickup device 8 is started next, the remaining GVC is emitted, and the image pickup device 8 is properly exposed.
An appropriate exposure of GVC = GV is performed (steps S39 to S39).
S47).

Next, the sequence of the camera according to the second embodiment will be described with reference to FIGS. Note that the configuration of the present embodiment is the same as that of the camera according to the above-described first embodiment, and a description thereof will not be repeated.

In this sequence, when the image pickup device 8 has a higher sensitivity, the electronic shutter speed is set to TVC so that the image pickup device 8 becomes appropriate. That is, exposure is performed with a shutter speed faster than that of the film 6. However, SVC -S
When VF> 1, a warning is displayed on the monitor 12 indicating that the shutter speed is fast (steps S118 and S1).
19). When the sensitivity of the image pickup device 8 is lower, the gain of the preamplifier 9 is made larger than usual, and the luminance on the monitor 12 is increased. However, this is also limited,
If SVF-SVC> 3, a limiter is provided, and a warning is displayed on the monitor 12, that is, the fact that the exposure is actually brighter (steps S120 and S12).
2). By this warning, the user can recognize that the film is different from the monitor 12. Other sequences are the same as those in the first embodiment.

Next, the sequence of the camera according to the third embodiment will be described with reference to FIGS. Note that the configuration of the present embodiment is the same as that of the camera according to the above-described first embodiment, and a description thereof will not be repeated.

In this sequence, when the image pickup device 8 has a lower sensitivity than the film 6, the image pickup device 8 performs exposure at two types of film shutter speed TV and an appropriate electronic shutter speed TVC of the image pickup device 8, and obtains two image information. And if there is no large difference, the TVC image is reproduced on the monitor (steps S24 and S25). Other sequences are the same as those in the first embodiment. Thereby, an appropriate image can be normally reproduced on the monitor.

As described in detail above, in the camera of the present invention, even if the sensitivity of the image pickup device and the film is different, the same situation as when the film was exposed on the monitor can be reproduced.
Further, even when reproduction is not possible, the information can be obtained.

According to the above embodiment, the following configuration can be obtained. (1) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the sensitivity of the silver halide film and the imaging device. A correction means for changing a control method of the image pickup element when the sensitivity is different from the case where the sensitivity is substantially equal. (2) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating the subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the sensitivity of the silver halide film and the imaging device. When the sensitivities are substantially equal, the shutter speed at the time of the silver halide film exposure and the electronic shutter speed of the image sensor are set to be substantially equal, and when different, the electronic shutter speed of the image sensor is simulated. Correction means for performing post-processing so that the brightness becomes equal to the shutter speed or the brightness on the monitor becomes appropriate. Camera. (3) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating the subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the sensitivity of the silver halide film and the imaging device. When the sensitivities are substantially equal, the shutter speed at the time of the silver halide film exposure and the electronic shutter speed of the imaging device are set to be substantially equal. When the sensitivity of the imaging device is higher than the sensitivity of the silver halide film, the silver halide film is used. Opening the electronic shutter intermittently multiple times during film exposure, so that the time from when the electronic shutter opens first to when the electronic shutter closes last Camera is substantially equal to the shutter speed of the silver halide film characterized by comprising a correction means for such the image pickup element output is not saturated. (4) a photographing optical system for forming a subject image on a silver halide film, monitor means for checking the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the sensitivity of the silver halide film and the imaging device. When the sensitivities are substantially equal, the shutter speed at the time of the silver halide film exposure and the electronic shutter speed of the image sensor are set to be substantially equal. Correction means for digitally amplifying the output at a subsequent signal processing stage while keeping the shutter speed substantially equal to the shutter speed of the silver halide film; and Camera characterized by comprising a. (5) a photographing optical system for forming a subject image on a silver halide film, monitor means for checking the subject image, an image sensor for generating an electric signal for creating the subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the image pickup device is better than the silver halide film Correction means for strobe light emission required for proper exposure of the silver halide film in a flash shooting when sensitivity is high, divided into a plurality of times to emit light, and an electronic shutter of the image sensor is opened only when a part of the light is emitted. And a camera. (6) a photographing optical system for forming a subject image on a silver halide film, monitor means for checking the subject image, an image sensor for generating an electric signal for creating the subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the sensitivity of the imaging device and the silver halide film is If they are substantially equal, the shutter speed of the film at the time of exposure and the electronic shutter speed of the image sensor are set to be substantially equal. If the image sensor is more sensitive than the silver halide film, set the appropriate shutter speed for each. And a correction means for performing the correction. (7) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give a proper exposure to the silver halide film, and the image pickup device is better than the silver halide film A camera which, when the sensitivity is low, keeps the electronic shutter speed of the image sensor substantially equal to the shutter speed of the silver halide film, and further increases a gain of an analog amplifier circuit thereafter. . (8) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give an appropriate exposure to the silver halide film; and And a correction means for displaying a warning when it is difficult to give substantially the same shutter speed to both cameras. (9) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give an appropriate exposure to the silver halide film; and When substantially equal, the electronic shutter speed of the image sensor and the shutter speed of the silver halide film are set to be substantially equal. When the sensitivity of the image sensor is lower than that of the silver halide film, the image sensor is appropriate on the image sensor. To perform two electronic shutter operations at an electronic shutter speed that is substantially equal to the electronic shutter speed at which the film becomes appropriate and the shutter speed at which the film becomes appropriate. Camera characterized by comprising a means. (10) a photographing optical system for forming a subject image on a silver halide film, monitor means for confirming the subject image, an image sensor for generating an electric signal for creating a subject image on the monitor means, Exposure control means for obtaining an aperture value and a shutter speed from information on the brightness of the subject and sensitivity information of the silver halide film in order to give an appropriate exposure to the silver halide film; and When substantially equal, the electronic shutter speed of the image sensor and the shutter speed of the silver halide film are set to be substantially equal. When the sensitivity of the image sensor is lower than that of the silver halide film, the image sensor is appropriate on the image sensor. The electronic shutter operation is performed twice at an electronic shutter speed that is approximately equal to the electronic shutter speed at which the film becomes appropriate and an electronic shutter speed substantially equal to the shutter speed at which the film becomes appropriate. Correction means for comparing an image signal by two electronic shutter operations and reproducing an object on the monitor at an electronic shutter speed at which the image sensor becomes appropriate if there is no large difference between the two. camera.

[0056]

According to the present invention, there is provided a camera in which the electronic shutter speed and the film shutter speed are the same and the luminance on the monitor is appropriate even if the sensitivity of the film and the sensitivity of the imaging device are different. be able to.

[Brief description of the drawings]

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

FIG. 2 shows an interline type C constituting an image sensor 8;
FIG. 3 is a diagram illustrating a configuration of a CD.

FIG. 3 is a diagram showing a configuration of a CCD employing an embedded photodiode.

FIG. 4 is a flowchart illustrating an operation of the camera according to the first embodiment.

FIG. 5 is a flowchart illustrating an operation of the camera according to the first embodiment.

FIG. 6 is a flowchart illustrating an operation of the camera according to the first embodiment.

FIG. 7 is a time chart showing a state of signal reading.

FIG. 8 is a time chart showing an intermittent integration operation.

FIG. 9 is a flowchart showing a sequence of the camera according to the second embodiment.

FIG. 10 is a flowchart illustrating a sequence of the camera according to the second embodiment.

FIG. 11 is a flowchart illustrating a sequence of a camera according to the third embodiment.

FIG. 12 is a flowchart illustrating a sequence of a camera according to the third embodiment.

[Explanation of symbols]

1, 2 ... zoom lens, 3 ... aperture, 4 ... half mirror,
5 shutter, 6 film, 7 imaging lens system, 7 '
... field lens, 8 ... image sensor, 9 ... preamplifier,
DESCRIPTION OF SYMBOLS 10 ... Signal processing circuit, 11 ... Monitor drive circuit, 12 ... Monitor, 13 ... BPF circuit, 14 ... A / D conversion circuit, 15
... selection circuit, 16 ... AF detection circuit, 17 ... AF control circuit, 18 ... lens drive circuit, 19 ... lens position encoder, 20 ... BPF circuit, 21 ... A / D conversion circuit, 22 ...
Selection circuit, 23 ... AF detection circuit, 24 ... DX reading circuit,
25: AE operation circuit, 26: aperture control circuit, 27: shutter control circuit, 28: A / D conversion circuit, 29: memory,
Reference Signs List 30 D / A conversion circuit, 31 Correction circuit, 32 Image pickup device drive circuit, 33 Digital amplifier circuit, 34 FM operation circuit, 35 Light emission control circuit, 36 Flash light emission circuit, 37 Magnetic recording circuit 38, film feeding circuit, 4
0: zoom encoder, 41: amplification factor indicating circuit, 42:
Control circuit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/225 G03B 13/02 H04N 5/235 H04N 5/238

Claims (2)

(57) [Claims] An image sensor for displaying a subject image on an electronic monitor and generating a signal for monitoring the subject image in a camera capable of exposing the subject image to a film, and for exposing the film. Exposure control means for determining an aperture value and a shutter speed; and intermittently dividing the charge accumulation state of the image pickup device into a plurality of times during film exposure according to the film sensitivity and the exposure density determined by the aperture value and the shutter speed. Electronic
When the electronic shutter is first opened by opening the shutter
The time from when the electronic shutter closes to the last
Control means for controlling the shutter speed to be substantially equal to the shutter speed . 2. An object image is displayed on an electronic monitor.
With a camera that can expose the subject image to film.
And a strobe device and an image sensor for generating a signal for monitoring a subject image
And the amount of strobe light required for proper exposure of the above film
The flash is fired separately, and only when a part of the flash fires.
Control means for opening an electronic shutter of the image element .