JPH06350883A - Camera - Google Patents

Abstract

PURPOSE:To easily and surely photograph an artistic photograph, especially, without failure. CONSTITUTION:A photographing optical system 3 which forms an object image on a silver salt film 5, a photographing state changing means 12 which changes the photographing state of an object and a finder means are provided in a camera where the finder means is provided with an electric image pickup means 6 converting the object image into an electric signal, a correcting means 7 correcting the electric signal obtained by the electric image pickup means 6 in accordance with the change of the photographing state by the photographing state changing means 12 and a display means 8 displaying the object image based on the electric signal corrected by the correcting means 7. Moreover, the photographing state changing means 12 indicates that at least one of a diaphragm value, shutter speed, a filter characteristic and a film photosensitive characteristic is changed. Thus, the image which is extremely close to the image which is actually obtained by photographing can be observed through the finder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera capable of observing an image which is very close to an image actually obtained by photographing in a finder before photographing.

[0002]

2. Description of the Related Art Photographs of ancient times are "copying the truth"
As seen in news photographs and various recorded photographs, its main function is to accurately and faithfully depict the subject, but in recent years, with the advancement of technologies such as camera equipment, photographs are simply It is widely practiced to express the individuality and subjectivity of the photographer not only by faithfully depicting the facts, but by means of photographs. That is, photography already occupies one area of art, and many photographers provide works (photos) that are artistically excellent.

[0003]

However, when taking a picture with a conventional camera, especially when taking an artistic picture as described above, the conventional camera has a great disadvantage. That is, when taking a picture, the subject is observed by the viewfinder, but in the conventional camera, the viewfinder simply presents the shooting range.
This means that the image displayed in the viewfinder is different from the image of the photograph actually taken.

For example, when it is desired to take a photograph darker than it actually is, the aperture should be further narrowed down from the proper exposure state.
Alternatively, it is necessary to increase the shutter speed, but in such a case, with a conventional camera, how much the image obtained by shooting becomes darker and what kind of image can be obtained are taken by actually shooting and developing. You can not know unless you try.

Further, by setting a sensitivity setting different from the display sensitivity of the film, the color balance may be intentionally disturbed to perform shooting for a special effect. Even in such a case, the conventional camera is used. It was not possible to know how much such an effect would occur without actually photographing and developing.

[0006] Conventionally, for example, when shooting artistic photographs or commercial photographs in the studio or outdoors, many shots of the same subject with the same composition are taken, and the best photograph is taken. The reason why is generally selected is that there is a big problem that the image actually obtained cannot be observed in the viewfinder, as described above.

The present invention solves the problem of such a conventional camera, and an object of the present invention is to provide a camera capable of observing an image which is very close to an image actually obtained by photographing before photographing.

[0008]

[Means for Solving the Problems] To achieve the above object,
The invention according to claim 1 of the present application comprises a photographing optical system for forming a subject image on a silver salt film, a photographing state changing means for changing a photographing state of the subject, and a finder means for displaying the subject image. In the camera, the finder means includes an electric imaging means for converting a subject image into an electric signal,
Correction means for correcting the electric signal obtained by the electric imaging means in response to the change of the photographing state by the photographing state changing means, and display for displaying a subject image based on the electric signal corrected by the correcting means And an electric finder means having means.

According to the invention of claim 2, in the invention of claim 1, the photographing state changing means changes at least one of an aperture value, a shutter speed, a filter characteristic, and a photosensitive characteristic of a film. It is characterized by being a thing.

Further, the invention of claim 3 is the same as claim 1
In the invention of 2 or 2, the finder means includes an optical finder means, and a switching means for selectively operating the optical finder means and the electrical finder means is provided.

[0011]

In the camera of the present invention constructed as described above, the photographing condition of the subject is changed by the photographing condition changing means. That is, the photographer can change the aperture value, the shutter speed, the filter characteristics, especially the optical filter characteristics, the film photosensitive characteristics, and the like by using this photographing state changing means to take a desired photograph.

On the other hand, a subject image is formed on the electric image pickup means provided in the finder means. The subject image is converted into an electric signal to be an image signal, and after being corrected as will be described later, The image (subject image) output to the display means and based on the signal is displayed by the display means.

Here, the correction for the image signal obtained by the electric image pickup means is as follows. That is, in the past, instead of simply recording the subject,
When taking so-called artistic photographs that express one's individuality or assertion, the photographer should actively change the aperture value and shutter speed from appropriate values, or use various filters. However, when the photographing state is changed as described above, the correction unit applies a correction according to the change to the image signal obtained by the electrical image pickup unit.

For example, when the diaphragm is narrowed down or the shutter speed is set higher, the correction means sets the diaphragm or shutter speed for the image signal output from the electrical image pickup means. The correction is performed so that the subject image becomes darker according to the change amount of. Therefore, when such a change is made, the image displayed on the display means becomes darker than the photograph actually obtained.

Further, when a sensitivity different from the appropriate sensitivity instructed on the film is set in order to perform the photographing aiming at the special effect by positively disturbing the color balance, the correction means sets the film sensitivity to this film sensitivity. The image signal obtained by the electrical imaging means is subjected to the considered correction and output to the display means. As a result, the image displayed on the display means becomes the same as the photograph actually taken with the sensitivity setting.

For example, when the photographing state changing means sets a sensitivity n times the standard sensitivity instructed on the film, the correcting means corrects the image signal according to the sensitivity setting, An image sensitized to n times the standard sensitivity is displayed on the display means. As described above, in this camera, since images obtained by various sensitivity settings can be confirmed by the display means before shooting, it is possible to easily perform shooting with changed sensitivity settings and increase the degree of freedom in development. You can also let it.

As described above, in the camera according to the present invention, it is possible to observe almost the same image as the photograph obtained by the photographing state by the finder means in response to various changes of the photographing state before the actual photographing. By confirming the image created by changing the shooting state in various ways with the finder means, the photographer can perform more free artistic creative expression by photography.

Incidentally, the photographing state changing means is not limited to the means for changing the aperture, shutter speed, filter and film sensitivity as described above, and is not limited to the light from the subject imaged on the film surface. It includes all means for performing some control, and also includes means for changing the development state (developing method).

For example, in astrophotography and night scene photography, sensitized development for increasing the inherent sensitivity of the film by development, pre-exposure, high-temperature treatment, or hydrogen gas bath (hydrogen) under vacuum for the film before photography. In some cases, sensitization processing such as sensitization processing) is performed.

In such a case, as the photographing state changing means, the camera is provided with means for designating various developing modes (developing state such as developing time and used chemicals), and the correcting means is designated by the means. Depending on the developing mode, correction corresponding to, for example, the case where sensitized development is performed is applied to the image signal output from the electric image pickup means. As a result, the same image as the photograph when the designated development is performed is displayed on the display unit provided in the finder.

Further, the photographing state changing means may include means for switching whether or not a strobe is used. In this case, it is assumed that preliminary light emission is performed by the strobe, and the correction unit corrects the image signal output from the electric image pickup unit based on the result. As a result, it becomes possible to confirm the same image as the photograph obtained by the stroboscopic photography with the finder means before the actual photographing.

Further, in the camera according to the invention of claim 2,
It is possible to change at least one of the aperture value, the shutter speed, the filter characteristic, and the photosensitivity characteristic of the film by the photographing state changing means, and the image signal is corrected in accordance with the change. The corrected image is displayed on the display means.

Further, in the camera according to the third aspect of the present invention, the optical finder and the electrical finder can be selectively operated by the switching means. Therefore, in the case where various kinds of unusual photographing are not performed by the photographing state changing means as described above, for example, when simply recording is performed, only the optical viewfinder is selected and operated, and the electrical The power required for the finder means can be saved and the power consumption can be suppressed.

[0024]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a main part of a camera according to a first embodiment of the present invention. As shown in the figure, in the camera according to the present embodiment, a lens barrel 2 is attached to a camera body 1, and a photographing lens 3 for forming a subject image on a film surface 5 is provided in the lens barrel 2. A diaphragm 11 that is housed and that controls the amount of subject light is provided.

On the other hand, in the camera body 1, a shutter 10,
Further, a quick return mirror 4 for guiding the subject light to the finder device before photographing is provided. Further, the photographing state changing means 12 shown outside the camera is a means for changing various photographing states, and is attached when, for example, a dial for changing a shutter speed or an aperture value or various filters are attached. It includes means for specifying a filter, means for inputting film sensitivity, and the like. In addition,
The photographing state changing means 12 is actually provided in the camera body 1 or the lens barrel 2.

Further, the present camera, as a finder device, includes a solid-state image pickup device 6 for converting subject light into an electric signal,
Image signal (electrical signal) obtained by the solid-state imaging device 6
An image processing device 7 for correcting the image, a liquid crystal display 8 for displaying a subject image based on the image signal corrected by the image processing device 7, and an eyepiece 9.

The operation of the camera having the above structure will be described with reference to the block diagram of FIG. As shown in the figure, the subject light that has passed through the photographing lens 203 in the photographing standby state is imaged by the quick return mirror 204 on the image sensor surface of the solid-state image sensor (CCD camera) 206, and photoelectrically converted by the image sensor. It is output to the image processing device 207 as an image signal. Image processing device 207
Includes a memory and a CPU, and the image signal is stored in the memory.

In the image processing device 207, the information regarding the photographing state set by the photographing state changing means 212 is taken in, and the image signal is corrected based on the information. For example, when the photographer manually increases the aperture value, information about the aperture value is imported into the image processing apparatus 207 so that the image becomes darker with respect to the image signal according to the aperture change amount. Can be corrected.

Further, when the photographer manually sets the shutter speed to be high, the information about the shutter speed is taken into the image processing device 207, and the image signal is changed according to the change amount of the shutter speed. Correction is applied so that the image becomes dark.

As the correction relating to the shutter speed, the image accumulation time in the solid-state image pickup device 6 may be changed in accordance with the shutter speed. That is, when a fast shutter speed is set, the image storage time is shortened accordingly. On the contrary, when a slow shutter speed is set, the image storage time is lengthened accordingly. Constitute.

The corrected image signal is output to the display device (liquid crystal display) 208, and the liquid crystal display 208 displays the image in the set photographing state. Therefore, the photographer can look at the image displayed on the liquid crystal display 208 and determine whether the image is an image that the photographer wants to take. Then, when the displayed image is not the desired one, the photographing state changing means 212 changes the photographing state again.

When the shooting state is changed, the information is input to the image processing apparatus 207, and the image processing apparatus 207 again corrects the image signal stored in the memory according to the changed shooting state. It is performed and output to the display 208. Then, an image according to the changed shooting state is displayed on the display 208.

As described above, the photographer is required to display the display 20.
While confirming 8, the shooting state is changed until a desired image is obtained. Then, when a desired image is obtained, the shutter release is pressed to perform photographing. The shutter release operation retracts the quick return mirror 4 from the photographing optical path, and the shutter 10 travels to the film 5. Exposure is performed.

Further, at the time of photographing, the film speed is the standard speed instructed by the film (for example, ISO = 100).
If the sensitivity is changed to a different sensitivity (for example, ISO = 1600), information on the changed setting sensitivity (ISO =
1600) is input to the image processing apparatus 7, and the image processing apparatus 7 corrects the image signal based on the information and outputs it to the display 8. This allows the photographer to check the effect of various sensitivity settings before shooting, even when intentionally breaking the color balance as a sensitivity setting different from the film display sensitivity and shooting for special effects. Becomes

Further, the image processing device 7 may be adapted to apply correction to the image signal in consideration of the type of film. That is, although it is known that the film characteristics (photosensitive characteristics, development characteristics, etc.) differ depending on the manufacturer even if the film sensitivity is the same, the image processing device 7 relates to the type of the film loaded in the camera. The information is taken in and the image signal is corrected according to the type of film. This makes it possible to observe an image in consideration of the type of film with a finder before shooting.

In this case, as a means for inputting the information on the type of film to the image processing device 7, a means for detecting the pattern of the cartridge is provided, and the information is input by this means, or the film surface or the cartridge surface. It is conceivable that a dedicated information recording portion is provided on the disk and the information of the recording portion is read to specify the type of film. Also,
The camera body 1 may be provided with a switch so that the photographer himself / herself inputs the type of film.

Further, in the present camera, a dial for specifying the developing method is provided as the photographing state changing means, and the image processing device 7 displays an image obtained when the developing method designated by the dial is performed. It is also possible to correct the image signal so that According to this structure, even when a special developing method is used, an image obtained by the developing method can be observed with a finder before photographing.

As described above, according to the camera of the present embodiment, when various settings are manually made regarding the shooting state,
Since the photographer can check the photograph (image) obtained by the setting with the viewfinder before shooting, for example, the sun at sunset, the night view, and various other objects can be manually set with the aperture and shutter speed. For example, in the case of setting and taking an art photograph, it is possible to easily and surely take a desired photograph without fail.

FIG. 3 is a block diagram showing the structure of the main part of a camera according to the second embodiment of the present invention. As shown in the figure, the camera according to the present embodiment is provided with a photographing state changing means 312 like the camera according to the first embodiment, and includes a solid-state imaging device 306, an image processing device 307, and a liquid crystal display 308. The liquid crystal display 308 is provided with a camera body 301.
The camera is provided with a known optical finder provided at the center of the back surface of the camera and further including an eyepiece lens 309, a correction lens 313, and a mirror 314.

The optical finder and the electric finder device are selectively operated. That is, the mirror 315 provided above the quick return mirror 304 is capable of advancing into and retracting from the optical path from the quick return mirror 304 to the solid-state imaging device 306, and is in a state of advancing into the optical path. In the state shown by the solid line in the figure, the subject light reflected by the quick return mirror 304 is guided to the optical finder by the mirror 315. On the other hand, the state in which the mirror 315 is retracted from the optical path (state shown by a chain double-dashed line in the figure)
Then, the subject light is the solid-state imaging device 30 of the electrical viewfinder.
Guided to 6.

The switching of the finder is performed by a switch (not shown). When the optical finder is selected by the switch, the mirror 315 is in the optical path from the quick return mirror 304 to the solid-state image pickup device 306. Entered the correction lens 313 and mirror 314
As a result, the subject light is guided to the eyepiece lens 309, and the electric power supplied to the electric finder device is cut off to stop its operation.

Therefore, in the present camera, when the electric viewfinder device is not used, for example, when the recording is simply performed, the optical viewfinder can be used for the photography. In this case, since the electric finder device is not operated as described above, power saving is achieved.

The operation of the electric finder device is the same as that of the camera according to the first embodiment.

[0044]

As described above, according to the present invention,
Since it is possible to observe an image that is very close to the image actually obtained by photographing before photographing, it is possible to easily and surely photograph the photograph desired by the photographer without failure.

[Brief description of drawings]

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

FIG. 2 is a flowchart showing an operation of the camera of the first embodiment.

FIG. 3 is a block diagram showing a configuration of a main part of a camera according to a second embodiment of the present invention.

[Explanation of symbols]

 1,301 Camera body 2,302 Lens barrel 3,303 Photographing lens 4,304 Quick return mirror 5,305 Film surface 6,306 Solid-state imaging device (CCD camera) 7,307 Image processing device 8,308 Display device (liquid crystal display) ) 9,309 Eyepiece 10,310 Shutter 11,311 Aperture 12,312 Imaging state changing means 315 Mirror

Claims (3)

[Claims] 1. A camera comprising a photographing optical system for forming a subject image on a silver halide film, a photographing state changing means for changing a photographing state of the subject, and a finder means for displaying the subject image. The finder means includes an electric image pickup means for converting a subject image into an electric signal, and a correction means for correcting the electric signal obtained by the electric image pickup means in response to the change of the photographing state by the photographing state changing means, A camera comprising: an electric finder means having a display means for displaying a subject image based on the electric signal corrected by the correction means. 2. The camera according to claim 1, wherein the photographing state changing unit changes at least one of an aperture value, a shutter speed, a filter characteristic, and a film photosensitive characteristic. . 3. The finder means includes an optical finder means, and switching means for selectively operating the optical finder means and the electrical finder means is provided. The camera described in.