JPH10319466A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain appropriate exposure for photographing by both of a silver salt film and a CCD by controlling the gain of an electric signal outputted from the CCD in accordance with the light quantity of light received by the CCD at the time of simultaneously executing photographing by the silver salt film and the CCD. SOLUTION: In a silver salt film camera part A, the light from an object of photographing passes through a silver salt film lens 2 and a silver salt film shutter served also as a diaphragm 6, to reach the silver salt film 8. In a digital camera part B, the light from the object of photographing passes through a CCD lens 3 and then, is received by the CCD 15. When the light emitting system of a flash light emitting device 4 is of a flashmatic system, the stop value of the silver salt film lens 2 is decided from the emitted light quantity of the flash light emitting device 4 and a distance up to the object. When photographing by the silver salt film and the CCD is simultaneously executed, the proper exposure for photographing by the CCD 15 can be obtained in such a manner that the gain of an output signal from the CCD 15 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera capable of simultaneously photographing the same object with a silver halide film and photographing with a charge-coupled device (CCD) for converting received light into an electric signal. The present invention relates to a camera capable of performing both shootings with proper exposure when a flash light emitting device emits light.

[0002]

2. Description of the Related Art In general, in a so-called silver halide film camera, a silver halide film is illuminated with photographic light reflected from a subject to be photographed. Thereafter, the photographed film is developed and fixed, and the photographed image can be observed. On the other hand, in recent years, for example, photoelectric conversion elements (photodiodes) that detect light of three primary colors, red (R), green (G), and blue (B), and convert the light into electric signals are arranged at a predetermined pitch. A so-called digital camera, which includes a color CCD (charge coupled device) area image sensor (hereinafter referred to as a CCD) and captures an image of an object to be captured by the CCD, has become widespread.

In the case of a digital camera having a CCD as described above, an image of an object to be photographed is guided onto the CCD through an appropriate optical path, and photographing is performed. Then, the obtained image is displayed on the monitor, and the photographer adjusts the focus position and the imaging range while looking at the monitor. The photographed image digital data is temporarily stored in a memory, read out as appropriate, displayed on a monitor, and the photographed image is observed.

[0004] Therefore, the latter digital camera is advantageous over the former silver halide film camera in that the captured image can be immediately reproduced and the captured image can be observed immediately. However, in terms of image quality such as the resolution of a photographed image, a digital camera depends on the performance of a CCD and does not yet reach the image taken by a silver halide film camera.

Therefore, a digital camera and a silver halide film camera can be selectively used depending on the photographer's intention, that is, the need for immediacy or image quality.

[0006]

However, there are cases where the intentions of the two photographers, ie, the immediacy and the image quality, coexist. In this case, a silver halide film camera and a digital camera are carried in accordance with each intention. It is necessary.
Such a case is disadvantageous in terms of weight and handling. Therefore, in order to provide a camera that satisfies both the above-mentioned immediacy and image quality with one unit, a camera in which a silver halide film camera and a digital camera are combined is desired.

When such a combined camera is provided, when a flash light emitting device such as a speedlight emits light to simultaneously perform silver halide film shooting and CCD shooting, the following problems occur in the exposure control. .

That is, in general, in CCD shooting, when the sensitivity of the CCD and the aperture value of the CCD lens are fixed, exposure is controlled by adjusting the charge accumulation time of the CCD.

On the other hand, in photographing a silver halide film using a flash light emitting device, the exposure control method generally uses a flash in which the amount of light emitted from the flash light emitting device is constant and the aperture value is set according to the shooting distance. It is a matic system. At this time, in the combined camera, when the light emitting method of the flash light emitting device is the flashmatic method, the exposure control in photographing by the CCD cannot be adjusted by the charge accumulation time of the CCD, and a proper exposure cannot be obtained. .

SUMMARY OF THE INVENTION It is an object of the present invention to provide a camera capable of obtaining a proper exposure for both shooting when a silver halide film shooting and a CCD shooting are simultaneously performed using a flash light emitting device.

[0011]

According to the present invention, a first optical path for guiding light from an object to be photographed onto a silver halide film, and light from the object to be photographed are received. A second optical path leading to a two-dimensional photoelectric conversion element that converts light into an electric signal, aperture means disposed on the first optical path, and imaging by the silver halide film and imaging by the photoelectric conversion element are performed simultaneously. Control means for controlling a gain of an electric signal output from the photoelectric conversion element in accordance with an amount of light received by the photoelectric conversion element when the operation is performed. Achieved by

Further, a camera according to a second configuration of the present invention that achieves the above object is the camera according to the first configuration, further comprising a flash light emitting unit that irradiates a flash to the object. The means controls a gain of an electric signal output from the photoelectric conversion element when the flash light emitting means emits light to perform photographing.

The control means obtains the light quantity based on, for example, the relationship between the sensitivity of the silver halide film and the aperture value of the aperture means.

In the above configuration, the photoelectric conversion element (CC
The appropriate exposure for shooting according to D) is obtained from, for example, the relationship between the aperture value of a lens for a silver halide film and the film sensitivity, and it is possible to appropriately set both the exposure using a silver halide film and the exposure using a CCD. Become.

[0015]

Embodiments of the present invention will be described below. However, the technical scope of the present invention is not limited to this embodiment.

FIG. 1 is a front view of the camera of the present invention.
In FIG. 1, a camera body 1 is provided with a silver halide film lens 2, a CCD lens 3, and a flash light emitting device 4 such as a speedlight.

FIG. 2 is a block diagram of the camera of the present invention. In FIG. 2, a camera according to the embodiment of the present invention includes a silver halide film camera unit A, a digital camera unit B,
It comprises a flash emission section C and a control section D common to the sections A, B, and C.

The silver halide film camera section A has a silver halide film lens 2. The light from the photographing object passing through the lens 2 passes through the silver halide film diaphragm / shutter 6 and reaches the silver halide film 8. Further, the shooting distance is calculated by an autofocus mechanism having the autofocus optical system 10 and the autofocus sensor 11. Then, based on the shooting distance, the lens driving unit 5 drives the silver halide film lens 2 so that the subject image is focused on the silver halide film 8. Further, the luminance at the position of the silver halide film 8 is measured by a photometric sensor (not shown), and based on the measured luminance and the silver halide film sensitivity read by the silver halide film sensitivity reading unit 9, a diaphragm / shutter for silver halide film is used. Reference numeral 6 is controlled by an aperture / shutter drive unit 7.

The digital camera section B includes a CCD lens 3
Having. The light from the photographing object passing through the lens 3 is received by a CCD (Charge Coupled Device) that converts the received light into an electric signal. CCD15 is CCD
Driven by the drive unit 16. Then, the output of the CCD 15 is input to the amplification and A / D conversion circuit 17, where the gain is controlled and converted into a digital signal. Further, the digital signal is processed as image data in the image processing unit 18 and stored in the storage unit 19.

The image data processed by the image processing section 18 is converted into an analog signal by a D / A conversion circuit 20. The analog signal is supplied to a display drive unit 21 that drives a display unit 22 such as a liquid crystal monitor.
Is displayed as an image via.

The flash light emitting section C comprises a flash light emitting device 4 such as a speedlight.

The control section D has a microcomputer 12. The microcomputer 12 performs calculations such as a shooting distance and an exposure based on an operation signal input from the camera operation unit 13 by the operator, and performs shooting control.

In the camera having such a configuration, the photographing distance measured by the autofocus mechanism, the luminance of the position on the surface of the silver halide film 8 measured by a photometric sensor (not shown), and the film sensitivity read by the sensitivity reading section 9. Therefore, when the microcomputer 12 determines that sufficient exposure for photographing with the silver halide film 8 cannot be obtained, the microcomputer 12 controls the flash light emitting device 4 to emit light.

In such a case, when the light emitting method of the flash light emitting device 4 is the above-described flashmatic method, the light emission amount of the flash light emitting device 4 is determined. Therefore, the aperture value of the silver halide film lens 2 is determined from the amount of light emission and the distance to the obtained subject. Then, the aperture / shutter driving unit 7 opens the aperture / shutter 6 so that the aperture value becomes the determined aperture value. When the aperture value is reached, the flash light emitting device 4 emits light, and the silver halide film is exposed.

As described above, in the photographing of the silver halide film, the photographing with the proper exposure is performed as described above. However, when the silver halide film shooting and the CCD shooting (hereinafter referred to as CCD shooting) are performed simultaneously, if the exposure is adjusted according to the silver halide film shooting as described above, the light emission time of the flash light emitting device 4 is extremely short. In CCD imaging, the exposure control cannot be adjusted by the charge accumulation time. Therefore, in the embodiment of the present invention, in such a case, the proper exposure for photographing by the CCD 15 is
It is obtained by adjusting the gain of the output signal from the CCD 15 (hereinafter simply referred to as gain). Hereinafter, a method of adjusting the gain will be described.

FIG. 3 is a diagram showing the relationship between the aperture value and the gain of the silver halide film lens 2 corresponding to the shooting distance and the film sensitivity when the guide number (GN) of the flash light emitting device is 12. In FIG. 3, when the film sensitivity is ISO100 and the shooting distance is 3 m, the aperture value at which a proper exposure can be obtained is f / 4. Furthermore, the shooting distance is √
When it is doubled, the aperture value becomes f / 2.8 which is one step brighter. Further, when the film sensitivity becomes ISO 200, the aperture value is one step darker f / even when the shooting distance is 3 m.
5.6.

The sensitivity of the CCD 15 of the digital camera section B is fixed, and in this embodiment, the sensitivity is equivalent to ISO100. Further, the aperture value of the CCD lens 3 is also fixed, and the aperture value is f / 4. Therefore, in photographing with the CCD 15, an appropriate exposure can be obtained when photographing at a photographing distance of 3 m. The gain at this time is, for example, “1”.

The sensitivity of the silver halide film 8 is ISO10
If the shooting distance is increased by a factor of で 2 at 0, it is necessary to set the aperture value of the silver halide film lens 2 to f / 2.8, which is one step brighter, and to double the gain.

On the other hand, when the sensitivity of the silver halide film 8 becomes ISO50 with the shooting distance kept at 3 m, the aperture value of the silver halide film lens 2 is reduced to half the sensitivity of the silver halide film. It is necessary to make f / 2.8 one step brighter.
However, in the digital camera section B, the CCD 1
Since the sensitivity of No. 5 is the same, an appropriate exposure can be obtained while the gain remains "1".

Therefore, the gain is a value that depends on the shooting distance, that is, the amount of light received by the CCD. That is, when the photographing distance becomes √2 times, the amount of light from the subject image becomes １ ／, so that the gain becomes 2. Also, when the shooting distance becomes 1 / √2, the light quantity doubles, so that the gain becomes １ ／.

At this time, in response to the change in the light amount, the gain for obtaining the proper exposure is set according to the ISO of the silver halide film 8.
It can be obtained from the sensitivity and the aperture value of the silver halide film 8. Generally, the value indicating the sensitivity of the silver halide film 8 is S
The v value is used. The Sv value of ISO 100 is 5,
The relationship with the ISO sensitivity is represented by ISO = 100 × 2 ^Sv-5 .

On the other hand, the Av value is generally used as a value representing the aperture value, and the relationship with the f value is represented by f = 2 ^{Av / 2} . Since the film sensitivity is ISO100 and the gain is 1 when the aperture of the silver halide film lens 2 is f / 4, the gain is set to the film I
When expressed as a function of the SO sensitivity Sv value and the aperture value Av value, it can be expressed as gain = 0.5 × 2 ^Sv-Av . By calculating the gain using this equation, it is possible to obtain a gain for obtaining an appropriate exposure in CCD photographing from an arbitrary film sensitivity and an aperture value of an arbitrary silver halide film lens.

As described above, when the light-emitting device 4 emits light to perform the silver halide film shooting and the CCD shooting simultaneously, the gain is adjusted by adjusting the sensitivity of the silver halide film 8 and the aperture value of the silver halide film lens 2. , Both of which can be performed with proper exposure.

In the embodiment of the present invention, C
Exposure control in CD shooting is performed by adjusting the gain by the amplification circuit 17.
In, the adjustment can also be performed by adjusting the brightness of the image data. That is, the gain may be adjusted when the output signal from the CCD is an analog signal, or may be adjusted after being converted into a digital signal.

In the embodiment of the present invention, the photographic lens is provided for each of the silver halide film 8 and the CCD 15, but as shown in FIG. The same control can be performed even when the optical path of the photographing light passing therethrough is branched into two. That is, when the aperture value of the aperture / shutter 6 is set in accordance with the sensitivity of the silver halide film 8, the gain of the CCD 15 is determined based on the relationship between the sensitivity of the silver halide film 8 and the aperture value of the aperture / shutter 6. By adjusting, it is possible to appropriately control the exposure for both shootings.

In the above-described embodiment of the present invention, the case where the exposure is obtained based on the flashmatic system in which the light emission amount of the flash light emitting device 4 is always constant has been described. Also, in shooting by the dimming method in which the flash amount is adjusted manually based on the aperture value to adjust the light emission amount to set an appropriate exposure, the sensitivity of the silver halide film and the From the lens aperture value, it is possible to calculate a gain for proper exposure.

In the embodiment of the present invention,
Although the adjustment of the gain when the flash light emitting device 4 emits light has been described, the exposure control in the CCD shooting is also adjusted based on the gain obtained above, instead of the charge accumulation time, even in imaging in which the flash light emitting device 4 does not emit light. It is also possible to do.

[0038]

As described above, according to the present invention, when performing silver halide film photography and CCD photography simultaneously,
Silver halide film photography and CCD with flash device 4 emitting light
When shooting is performed simultaneously, it is possible to appropriately adjust the exposure for both shootings.

[Brief description of the drawings]

FIG. 1 is a front view of a camera according to an embodiment of the present invention.

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

FIG. 3 is a diagram illustrating a relationship between an aperture value and a gain corresponding to a shooting distance and film sensitivity when a guide number (GN) of a light emitting device is 12.

FIG. 4 is a block diagram of a camera according to another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 camera body 2 lens for silver halide film 3 lens for CCD 4 flash light emitting device 8 silver halide film 9 sensitivity reading unit 12 microcomputer 15 CCD 17 amplification and A / D conversion circuit 18 image processing unit

Claims (4)

[Claims] 1. A first optical path for guiding light from an object to be photographed onto a silver halide film; and a second optical path for guiding light from the object to be photographed to a two-dimensional photoelectric conversion element for converting received light into an electric signal. A second optical path, aperture means disposed on the first optical path, and when the imaging with the silver halide film and the imaging with the photoelectric conversion element are performed simultaneously, according to the amount of light received by the photoelectric conversion element. A camera for controlling a gain of an electric signal output from the photoelectric conversion element. 2. The photoelectric conversion device according to claim 1, further comprising: a flash light emitting means for irradiating the object to be shot with a flash, and wherein the control means causes the flash light emitting means to emit light to perform shooting. A camera for controlling the gain of an electric signal output from a camera. 3. The camera according to claim 1, wherein the control unit obtains the light amount based on a relationship between a sensitivity of the silver halide film and an aperture value of the aperture unit. 4. An exposure control method according to claim 2, wherein the flash light emitting means emits light, and the exposure control method includes irradiating the object with a fixed amount of flash light.
A camera using a flashmatic system that obtains an appropriate aperture value according to a shooting distance.