JPH10171011A - Camera used for both of silver-salt photographing and electronic image pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the exposure level of a subject imprinted on a silver-salt film and the blurring state of a background to be confirmed on a liquid crystal monitor and to inform a photographer of the proper exposure level and a proper stop value. SOLUTION: This camera is provided with an electronic image pickup device including an area sensor 15, a monitor display device 23 consisting of liquid crystal and a photographing device including a shutter 6 exposing the silver-salt film 7. Besides, it is constituted so that the state of a picture exposed on the film 7 can be confirmed on the display device 23 in advance by executing an image pickup action by correcting the luminance of the picture being a subject image outputted from the image pickup device or changing a diaphragm arranged in light inputted to the image pickup device to several stages.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has both functions of an electronic image pickup device having an electronic image pickup device for converting a subject image into an electric signal and a silver halide photographing device for imprinting the subject image on a silver halide film. , A silver halide photography and an electronic imaging camera.

[0002]

2. Description of the Related Art Conventionally, a camera for both silver halide photography and electronic imaging that exposes a subject image to a silver halide film and stores the subject image photoelectrically converted by an electronic image pickup device in a memory is known. For example, Japanese Unexamined Patent Publication No. 1-1330
No. 38 discloses a configuration in which a light beam is branched to a finder optical system by a half mirror when a shutter is closed, and the light beam is branched to an image sensor and a photosensitive material by rotating the half mirror when the shutter is opened. It is shown. Here, the image signal of the subject image obtained by the image sensor is displayed on a monitor provided in the camera in advance, so that the camera operator can immediately confirm the subject image at the time of shooting.

[0003]

In a silver halide camera, it is generally impossible to determine at the time of photographing whether or not an image photographed on a film is photographed as intended by the photographer. . That is, the camera operator cannot accurately determine whether or not the exposure level of the subject image projected on the film and the degree of blurring of the background are appropriate at the time of shooting. For this reason, in the recent silver halide camera market, cameras having a so-called auto bracket mode are sold. In the auto bracket mode, it is not possible to accurately determine whether or not the exposure level is at an appropriate level according to the operator's intention at the time of shooting, so that, for example, the exposure level is set to -1, ± 0, +1.
The photographing is automatically performed continuously for three frames while switching to the three stages. In other words, if you change the exposure level and shoot multiple frames, any of the shot frames
This is a mode in which photographing is performed with the expectation that the exposure level will be as intended by the camera operator.

On the other hand, in the configuration of Japanese Patent Laid-Open Publication No. Hei 1-133038, it is possible to check the composition at the time of photographing in advance, but the exposure level and the degree of blurring of the background when imprinted on the film are appropriate. There is no mention of prior confirmation as to whether or not this is the case. In a camera having the auto bracket mode, a plurality of frames must be shot, so that the film is wasted.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object to provide an electronic image pickup apparatus having an electronic image pickup device for converting a subject image into an electric signal; With a simple configuration, it is possible to check in advance the exposure level of the subject to be projected on the film and the degree of blurring of the background in a camera that combines the functions of a silver halide photography device and a silver halide photography device. Another object of the present invention is to provide a camera that can notify a photographer of an appropriate exposure level and aperture value.

[0006]

According to a first aspect of the present invention, there is provided a camera for both silver halide photography and electronic imaging.
An electronic imaging device that converts a subject image into an electric signal, a monitor that displays an image corresponding to the subject image based on the image signal output from the electronic imaging device, and an imaging device that exposes the subject image to a silver halide film. Means for performing a predetermined correction on the image signal output from the electronic image pickup apparatus, and an image on which the correction is not performed and an image corrected by the correction means are displayed on the monitor means. ing.

According to a second aspect of the present invention, there is provided a camera for both silver halide photography and electronic imaging, wherein a photographing device for exposing a subject image to a silver halide film, and at least the subject image is converted into an electric signal at the time of the photographing. An electronic imaging device,
Monitor means for displaying an image corresponding to the subject image based on the image signal output from the electronic imaging device; and diaphragm means for continuously setting a different number of apertures by a predetermined number of apertures. In this way, a plurality of images are taken out continuously from the image pickup device according to different aperture values in the above-mentioned plurality of stages, and the images are displayed on the monitor. Has become.

According to the third aspect of the present invention, there is provided a camera for both silver halide photography and electronic imaging.
Alternatively, in the camera for both silver halide photography and electronic imaging according to claim 2, the display on the monitor means is such that the plurality of images are simultaneously displayed in a state of being divided on the same monitor screen.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating a system according to the present embodiment. A photographic lens for forming a subject image includes a positive lens 1 and a negative lens 3,
An aperture mechanism 2 is disposed in the photographing lens, and the aperture mechanism 2 is driven and controlled by an aperture drive circuit 12. A half mirror 4 is provided behind the negative lens 3, and a part of the subject light reflected by the half mirror 4 forms an image on an area sensor 15 through an imaging lens system 14.

An area sensor 15 as an electronic image element is controlled by an area sensor drive circuit 13 to convert the formed subject image into an analog video signal and output it to a signal processing circuit 22. The signal processing circuit 22 performs predetermined signal processing required for a known camera including conversion of the analog video into a digital signal. The signal processing circuit 22 is connected to a video memory 21 and a liquid crystal (LCD) monitor 23, and is also connected to a nonvolatile memory 26 and the like via a data bus 24.

The signal processing circuit 22 transfers the processed signal to the video memory 21 and the non-volatile memory 26, and the electronic image stored in the video memory 21
3 is displayed. The non-volatile memory 26 is attachable to the camera body, can be electrically rewritten, and retains the storage of the electronic image even when the power of the camera body is turned off, and is used for recording the electronic image. Further, the luminance of the subject is measured using the analog signal of the area sensor 15,
This analog signal is digitized by the signal processing circuit 22 and then transmitted to the CPU 27 via the data bus 24.

Further, behind the half mirror 4, there is provided a movable mirror 5 whose central part is a half mirror. It is provided to reflect. A separator optical system 16 for separating two images, which is composed of two optical systems, is arranged in the direction of the reflection optical axis of the sub-mirror 32 and in the direction perpendicular to the drawing. A line sensor 17 is disposed at the position where the subject image is formed by the separator optical system 16, and the line sensor 17 is connected to a line sensor drive circuit 19. The sub-mirror 32, the separator optical system 16, the line sensor 17, and the like constitute a focus detection device based on a known phase difference method. The CPU 27 outputs two images based on a signal input via the line sensor drive circuit 19. The distance is obtained, and the driving amount of the photographing lens for driving to the focusing position is calculated.

Each of the lenses 1 and 3 of the photographing lens is provided with a zoom / focus drive circuit 11 for controlling a drive source for a focus adjustment operation and a zooming operation. The zoom / focus drive circuit 11 has an encoder (not shown) that generates a signal in accordance with the movement of each of the lenses 1 and 3, and the CPU 27 calculates the signal based on the calculated drive amount and the encoder output. Performs zoom adjustment and focus adjustment. On the reflected light path of the movable mirror 5, a focusing plate 29, a pentaprism 30, and a finder eyepiece optical system 31 are arranged. The reason why the optical finder is provided in addition to the LCD monitor 23 for monitoring the subject is that the camera operator takes a picture while looking through the optical finder rather than taking a picture while looking at the LCD monitor 23. , The holding performance of the camera has been improved,
This is because camera shake is unlikely to occur.

The movable mirror 5 is provided with a mirror driving circuit 18
, And the shutter 6 is driven by a shutter drive circuit 20. When the movable mirror 5 is raised and the shutter 6 is opened, a subject image is formed on the silver halide film 7 and is exposed. The CPU 27 calculates the aperture value and the shutter speed of the aperture 2 for obtaining the proper exposure based on the subject luminance value output from the signal processing circuit 22 and the film sensitivity detected by a film sensitivity detection circuit (not shown). 6 is drive-controlled at the calculated shutter speed.

A magnetic recording layer is formed on the silver halide film 7, and a magnetic head 8 is arranged so as to be in contact with the magnetic recording layer. The magnetic head 8 has a function of magnetically recording various kinds of information and a function of reading out information magnetically recorded on the film, and the magnetic head drive circuit 9 controls writing and reading. Further, a film drive circuit 10 is provided in the camera body, and the film 7 is wound up for cueing when the film 7 is loaded into the camera, and the film 7 is wound up when one frame is shot. Then, after the film 7 has been photographed for all the frames, or when a forced rewind button (not shown) is operated, the entire feeding related to the rewinding operation is controlled. The magnetic recording by the magnetic head 8 is performed during this feeding operation.
The camera is provided with a strobe circuit 25 for illuminating the subject, and when the subject brightness is lower than a predetermined brightness, the CPU 27
, The light emission operation is performed as auxiliary light. The switch input block 28 includes a plurality of switches such as an operation switch (not shown) and a switch for detecting the operation of a mechanical mechanism.

The signal processing circuit 22, the strobe circuit 25, the non-volatile memory 26, the video memory 21,
Signal processing circuit 22, CPU 27, magnetic head drive circuit 9, film drive circuit 10, shutter drive circuit 20,
The line sensor drive circuit 19, the mirror drive circuit 18, the aperture drive circuit 12, and the zoom / focus drive circuit 11 are connected by a data bus 24 to exchange data. The operation of these drive circuits is controlled by the CPU 27.

FIG. 2 is a perspective view of a camera according to the present invention. In the figure, reference numeral 33 denotes a camera body 33; 35, a photographing lens barrel including positive and negative lenses 1, 3 and an aperture 2; 34, a zoom up / down operation button; 37, a strobe housed in the body; A release button, 36 is a power switch, 40 is a color LCD panel (2 in FIG. 1) for monitoring an electronic image captured by the electronic imaging device.
3). Press buttons 42, 43, 44
The electronic dial 41 is an operation member for setting camera information. The push button 42 is a switching button for switching the exposure mode, and for example, switches among a program mode, an aperture priority mode, a shutter speed priority mode, and the like. The push button 43 is a switching button for switching a photographing mode, and switches between a mode in which the silver halide photographing device and the electronic imaging device are simultaneously operated and a mode in which only the electronic imaging device is operated. The push button 44 is a button for setting a bracket mode.
And bracket mode 2 are switched. The electronic dial 41 is
This is for manually setting an exposure correction value, an aperture value, a shutter speed value, and the like.

Next, FIGS. 3 and 4 show examples of electronic images obtained by applying the present invention. FIG. 3 shows a plurality of electronic signals obtained by subjecting an image signal of a subject obtained by the electronic imaging apparatus of the present invention to the luminance correction of the present invention in addition to the conversion characteristics of the imaging apparatus, the silver halide film, and the monitor. An image is shown. The conversion characteristics are disclosed by the present applicant in Japanese Patent Application No. 8-250361, and the description is omitted. First, a mode is set in which only the electronic imaging device is operated by operating the push button 43,
To set the camera to bracket mode 1. Next, when the release button 38 is pressed, a standard image (A) as an appropriate exposure based on the calculation of the CPU 27, and an under-image (B) displayed darker by a predetermined amount from the image (A) based on the exposure correction value. And an over image (C) displayed brighter by a predetermined amount than this image (A)
It is displayed on the monitor 23. The camera operator may select (A)
Obtaining an image according to the intention by selecting an image that matches the user's intention with reference to the images of (B) and (C) and determining the amount of exposure correction in the subsequent silver halide photography Can be.

FIG. 4 is a graph showing the change in the depth of field.
FIG. 5 shows a plurality of electronic images obtained by changing the aperture 2 and capturing images at three levels of aperture values. In the same manner as above, the camera operator first operates the push button 43 to set the mode to operate only the electronic image pickup device.
4 is operated to set the camera to the bracket mode 2.
Next, when the release button 38 is pressed, an image (A ′) obtained by capturing an image at a standard aperture value is recorded in the first image capturing operation, and a predetermined amount of aperture (A ′) is recorded in the next image capturing operation. (B) obtained by closing and taking an image
'), And further, images (C') obtained by opening the aperture by a predetermined amount from the standardly set aperture in the next imaging operation are recorded, and these are displayed on the LCD monitor 23. Is done. The camera operator is (A ')
By looking at the images (B ′) and (C ′), an image suitable for the photographing intention is selected, and the aperture value for the subsequent silver halide photographing is determined. In the present embodiment, three imagings are performed by changing the aperture value. However, an image signal obtained by one imaging can be displayed by adjusting the degree of blurring by image processing. It is.

Next, the operation of the embodiment of the present invention configured as described above will be described with reference to the flowchart shown in FIG. First, when the first release (not shown) is pressed, the process proceeds to step S2. Here, the release switch of this camera is a two-stage push button, and
The release is called the second release. Next, focus adjustment is performed in step S2. In this focus adjustment, the drive amount from the interval between two images to the focus position of the photographing lens is calculated based on the output signal of the line sensor 17 to drive the photographing lens, as is known. At this time, the absolute distance to the subject is also calculated based on the number of encoder pulse signals from the reference position (for example, the position at infinity) of the taking lens. Next, in step S3, the luminance of the subject is measured based on the output from the area sensor 15, and the measured photometric value and the sensitivity of the area sensor 15 determine the imaging time and aperture for obtaining an appropriate exposure with the electronic imaging device. Calculate the value (step S
4).

Next, in step S5, it is determined whether or not the second release switch has been pressed, and if not, step S5 is repeated. On the other hand, if the second release switch has been pressed, the flow shifts to the imaging sequence of the electronic imaging device from step S6. Next, an electronic image is fetched from the area sensor 15 (step S6), a bracketing process described later is performed (step S7), and stored in the nonvolatile memory 26 (step S8). Next, the stored electronic image is displayed on the LCD monitor 23 (Step S).
9).

Next, the subroutine for taking in the area sensor image in step S6 will be described with reference to the flowchart in FIG. First, the bracket mode is determined in step S11. In the case of the bracket mode 1, the counter N is set to 1 (step S12), and in the case of the bracket mode 2, the counter N is set to 3 (step S13). That is, it is set so that one imaging operation is performed in the bracket mode 1 and three imaging operations are performed in the bracket mode 3.

Next, the diaphragm drive circuit 12 drives the diaphragm 2 so as to have the set aperture value (step S1).
4). In driving the aperture, the bracket mode 2
Is set to “aperture value at which the aperture is set as a standard” and “aperture that is reduced by a predetermined amount (for example, one stop of the aperture) from the aperture value set at a standard value” for each of the three imaging operations. The aperture value is changed and set in the order of “value” and “aperture value opened by a predetermined amount (for example, one stop of aperture) from the standardly set aperture value”. Next, an electronic image is captured by the area sensor 15 (Step S).
15). The signal processing circuit 22 performs predetermined signal processing on the fetched image (step S16), converts the fetched image into an electronic image that has been converted into digital data, stores it in the video memory 21 (step S17), and decrements the counter N. Then, it is determined whether or not the counter N is 0 (step S19), and if it is 0, the subroutine ends (step S20). In step S19,
If the counter N is not 0, the mode is the bracket mode 2, so that the aperture value is reset to a different value as described above, and the sequence from step S14 is executed again.
An image signal corresponding to (B ′) · (C ′) is captured.

Next, a subroutine of the bracketing process in step S7 will be described with reference to the flowchart of FIG.
explain. First, in step S21, it is determined whether the mode is the bracket mode 1 or the bracket mode 2, and if the mode is the bracket mode 1, the process proceeds to step S22.
The following flow is executed. If the mode is the bracket mode 2, the flow from step S25 is executed. In the case of the bracket mode 1, the conversion characteristics corresponding to the film 7 loaded in the camera, the conversion characteristics of the area sensor 15,
A conversion formula is created in consideration of the conversion characteristics of the LCD monitor 23 (step S22). At this time, images (A), (B),
(C) Correction for giving a predetermined luminance difference (for example, image (A) has a luminance difference of ± 0 with respect to appropriate luminance, image (B) has a luminance difference of -1 step, and image (C) has a luminance difference of +1 step). Add coefficient.
Thereby, the images (A), (B), and (C) of FIG. 3 having different luminances are generated from one image data stored in the video memory 21 according to the conversion formula (step S2).
3) These images (A), (B) and (C) are combined and displayed on the LCD monitor 23 as shown in FIG. 8 (step S2)
4).

In the case of the bracket mode 2, similarly to the bracket mode 1, the film 7 loaded in the camera is used.
A conversion formula is created in consideration of the conversion characteristics corresponding to the above, the conversion characteristics of the area sensor 15, and the conversion characteristics of the LCD monitor 23 (step S25). By performing the imaging operation three times with the different aperture values described above, the image data of three images stored in the video memory 21 in accordance with the above-described conversion formula is converted into an image having a different degree of blur according to the aperture value in FIG. (A '), (B'), and (C ') are generated (step S26), and the images (A'), (B '), and (C') are combined to form the LCD monitor 23 as shown in FIG. (Step S27).

That is, when the camera operator wants to determine an appropriate exposure level, he or she can determine the exposure correction amount by looking at the images in bracket mode 1 ((A), (B), and (C) in FIG. 3). If it is desired to determine an appropriate aperture value, an image of the bracket mode 2 ((A ′), (B ′), (C
It is only necessary to determine the aperture value by looking at (1)).

(Appendix) According to the embodiment of the present invention described in detail above, the following configuration can be obtained. That is,

(1) An electronic image pickup device having an electronic image pickup device for converting a subject image into an electric signal, monitor means for displaying based on an image signal output from the electronic image pickup device, and a silver halide A silver halide photographing device that exposes the film; and a correction unit that performs predetermined luminance correction on an image signal output from the electronic imaging device. The correction unit has a plurality of correction amounts having different correction amounts. A camera for both silver halide photography and electronic imaging, wherein the image signal output from the electronic imaging device is corrected and the plurality of images are displayed on the monitor means.

(2) An electronic image pickup device having an electronic image pickup device for converting a subject image into an electric signal, monitor means for displaying based on the image signal output from the electronic image pickup device, and a silver halide A silver halide photographing device that exposes the film, and a variable aperture unit that limits subject light passing through the electronic imaging device and the imaging lens of the silver halide imaging device. A camera for both silver halide photography and electronic imaging, characterized in that the electronic imaging device performs imaging plural times while changing the image to a plurality of stages, and displays a plurality of images obtained from the imaging device on the monitor.

(3) In the above (1) or (2),
A camera for both silver halide photography and electronic imaging, wherein the display on the monitor means combines and displays the plurality of images. (4) An electronic imaging device having an electronic imaging device for converting a subject image into an electric signal, monitor means for displaying based on the image signal output from the electronic imaging device, and exposing the subject image to a silver halide film A silver halide photographing apparatus, the imaging apparatus, the silver halide film, and signal conversion means for converting and outputting an image signal output from the electronic imaging apparatus in accordance with the conversion characteristics of the monitor means; Correction means for performing predetermined luminance correction on the output of the means, the correction means having a plurality of correction amounts having different correction amounts, and applying the correction to the signal output from the signal conversion means. A camera for both silver halide photography and electronic imaging, wherein a plurality of images are displayed on the monitor means.

[0031]

As described above, the present invention relates to an electronic imaging device having an electronic imaging device for converting a subject image into an electric signal and a silver halide photographing device for projecting the subject image on a silver halide film. In a camera for both silver halide photography and electronic imaging that has both functions, with a simple configuration, it is possible to determine whether the exposure level of the subject to be photographed on the film and the degree of blurring of the background are photographed as intended by the photographer. Can be determined at the time of shooting. Further, since the film is not wastefully consumed, an economical camera can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the appearance of the camera in the embodiment.

FIGS. 3A and 3B are views showing a first display state in the embodiment, wherein FIG. 3A is an appropriate state, FIG. 3B is an exposure under state, and FIG. 3C is an exposure over state; It shows.

FIGS. 4A and 4B are diagrams showing a second display state in the embodiment, where FIG. 4A shows a case where the depth of field is normal and FIG.
Shows a case where the depth of field is deep, and (C) shows a case where the depth of field is shallow.

FIG. 5 is a flowchart showing the entire sequence in the embodiment.

FIG. 6 is a flowchart showing an image capturing portion in the embodiment.

FIG. 7 is a flowchart showing a bracket processing portion in the embodiment.

FIG. 8 is a diagram showing a first display state on a monitor screen in the embodiment.

FIG. 9 is a diagram showing a second display state on the monitor screen in the embodiment.

[Explanation of symbols]

 2 Aperture mechanism 13 Area sensor drive circuit 15 Area sensor 21 Video memory 22 Signal processing circuit 23 LCD monitor 40 LCD panel 41 Electronic dial 44 Bracket mode setting button

Claims (3)

[Claims] An electronic imaging device for converting a subject image into an electric signal; a monitor means for displaying an image corresponding to the subject image based on an image signal output from the electronic imaging device; A photographing device for exposing, and a unit for performing a predetermined luminance correction on an image signal output from the electronic imaging device, wherein a plurality of images of the uncorrected image and the corrected image are A camera for both silver halide photography and electronic imaging, characterized in that it is displayed on monitor means. 2. An imaging device for exposing a subject image to a silver halide film, an electronic imaging device for converting the subject image into an electric signal, and an image corresponding to the subject image based on an image signal output from the electronic imaging device. Monitor means for displaying, and aperture means for setting different aperture values, and by continuously changing the aperture value in a plurality of stages, performing a plurality of imaging operations continuously, A camera for both silver halide photography and electronic imaging, wherein a plurality of images corresponding to different aperture values are taken out from an imaging device and the images are displayed on the monitor. 3. The silver halide photography according to claim 1, wherein the plurality of images are simultaneously displayed in a state of being divided on the same monitor screen. And electronic imaging camera.