JPH10206929A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a composite type camera capable of using an optical finder in rational form by providing an optical path switching means by which 2nd divided light is made incident on a finder means when a 1st image pickup means does not pick up an image and it is made incident on a 2nd image pickup means when the 1st image pickup means picks up the image. SOLUTION: A main operation lever 301 turns centering around a shaft 301a. It is prevented from turning in the direction of an arrow A by making a driving lever 312 abut on a 1st arm part 301b at the time of observing an object image. At the time of picking up the image, the lever 301 turns in the direction of the arrow A with the movement of the lever 312 in the direction of an arrow C. A focus detection system mirror driving lever 303, a finder system mirror driving lever 302 and an eyepiece shutter driving lever 304 are actuated interlocked with the turning of the lever 301, so that they perform specified action. Then, the optical path of the divided light is switched between the finder means side and the 2nd image pickup means side by the levers 301 and 302 which are an optical path changing means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compound camera having a plurality of image pickup means such as a photographic film and a solid-state image pickup device.

[0002]

2. Description of the Related Art Conventionally, as this type of camera, there are those proposed in Japanese Patent Application Laid-Open Nos. 3-233543, 2-61626 and 8-65615. For example, in Japanese Patent Application Laid-Open No. Hei 3-233543 (hereinafter referred to as Japanese Unexamined Patent Application Publication No. Hei 3-233543), a video camera is mounted on a finder system of a single-lens reflex camera, and a light beam is provided according to the position of a mirror provided on an optical path of the finder system. Is switched between the viewfinder and the video camera.

[0003] Further, in the one proposed in Japanese Patent Application Laid-Open No. 2-61626 (hereinafter referred to as "Publication 2"), an image pickup system using a photographic film and a solid-state image pickup device (CCD area sensor) is provided in a binocular camera. They are formed as separate optical paths. Further, in the one proposed in Japanese Patent Application Laid-Open No. Hei 8-65615 (hereinafter referred to as Japanese Patent Application Publication No. 8-65615), in a single-lens camera, object light (subject light) incident from a photographing lens (objective lens) is divided into two by a half mirror. The light is divided, one of the divided lights is guided to a photographic film, and the other is guided to a solid-state imaging device to form two imaging systems.

[0004] Since all of these compound cameras can record an image and an electronic image on a photographic film, it is possible to confirm an object image on the electronic image before developing or printing the photographic film. .

[0005] Incidentally, the solid-state imaging device is used not only for imaging but also for measuring the brightness of a subject. For example, in a camera proposed in Japanese Patent Application Laid-Open No. H7-295026 (hereinafter referred to as "Publication 4"), a solid-state image sensor is used as a photometric element of a single-lens reflex camera, and a solid-state image sensor located at a light emitting portion of a pentaprism. The object image projected on the matte surface of the focusing screen is re-imaged via the imaging optical system. The exposure condition for the photographic film is determined based on the output signal of the solid-state imaging device and the sensitivity of the film, and the shutter speed for providing the proper exposure and the aperture value of the objective lens are calculated.

In addition, a camera which superimposes a display on a finder so that the displayed content can be confirmed without taking an eye from an object image to effectively display a camera control value or a warning which changes according to a subject condition. Have been proposed. The superimposed display is performed by disposing a light-shielding or light-emitting display element near a focusing screen on which an object image is projected. As a light shielding type display element, a TN liquid crystal display element and an electrochromic display element are widely known, and a display pattern is formed by shielding an object image at an arbitrary segment. As a light emitting display element, an electroluminescence display element is known. Further, as a method for performing display having both the light-shielding type and the light-emitting type, a method has been proposed in which a liquid crystal display element having a diffraction function is illuminated to partially emit light (Japanese Patent Laid-Open No. 6-130481). Reference).

[0007]

SUMMARY OF THE INVENTION In the above-mentioned combined camera, 1. There is no difference in the range of images captured between a plurality of imaging systems (no parallax between the imaging systems). 2. Simultaneous imaging of multiple imaging systems. If the viewfinder image meets the three conditions of high definition, composition, lighting, exposure,
It is extremely easy to check for blurring and focus, and further improvement in convenience can be expected.

[0008] 4. If the output of the solid-state imaging device for image recording can also be used for subject brightness measurement for photographic film imaging, image recording and subject brightness measurement can be performed with one solid-state imaging device. Becomes easier.

[0009] Here, since the cameras proposed in the publications 1 and 3 are single-lens systems, there is no parallax between the respective imaging systems, and the image areas recorded on different recording media can be made the same. Condition 1 is satisfied. Further, since the camera proposed in Japanese Unexamined Patent Publication (Kokai) No. 2 is a binocular camera, the output of the solid-state imaging device for image recording can be used for subject brightness measurement, and satisfies condition 4.

However, the camera proposed in Japanese Unexamined Patent Application Publication No. 2002-207,101 is basically parallax because it is of the two-lens type as described above. Although parallax can be apparently eliminated by shifting the effective pixel area on the solid-state imaging device according to the distance of the object to be imaged, the parallax correction by this method does It is only possible to align the positions in the two imaging screens with respect to the subject at a certain distance, and it is impossible to correct the parallax up to the part that is out of focus. Can only be satisfied.

Further, the cameras proposed in Japanese Patent Laid-Open Nos. 2 and 3 can capture an electronic image at the same timing as recording on a photographic film, and satisfy Condition 2.

However, in the camera proposed in Japanese Patent Laid-Open Publication No. H11-207, the image of the moment recorded on the photographic film is captured by a video camera because the object image on the focusing screen disappears when the photographic film is exposed. Can not. Moreover, since the optical path switching between the viewfinder and the video camera is performed by manual operation using a lever, there is a disadvantage that the electronic image capturing and the optical path switching are not linked.

Further, the cameras proposed in Japanese Patent Laid-Open Publications Nos. 1 and 2 use an optical finder, and can provide a high-definition, high-definition finder image at low cost, and satisfy Condition 3. Further, in the camera proposed in Japanese Patent Laid-Open Publication No. H07-27139, since the optical path is divided by using a half mirror, it is possible to use the output of the solid-state imaging device for image recording for measuring the luminance of the subject. Meets

However, the camera proposed in Japanese Patent Publication No. 3 uses an electronic finder, which requires a complicated and expensive configuration to obtain a high-quality, high-definition finder image. In other words, it is not realistic to display with the finer pixels than the resolution of the human eye using the electronic finder over the entire finder field of view, and it is almost impossible to obtain a finder image at the same level as the optical finder with the electronic finder It is. In the camera disclosed in Japanese Unexamined Patent Application Publication No. 2003-163, if a reflecting mirror is arranged in the photographing optical path of the photographic film to deflect the light beam, it is not impossible to add an optical finder. When the mirrors for viewing and finder observation are arranged, the layout of the photographing lens is greatly restricted, which leads to an increase in the size of the photographing optical system and a decrease in performance, which is not desirable.

Further, in the camera proposed in Japanese Patent Laid-Open Publication No. H11-207, the light beam diffused on the matting surface of the focusing screen enters the solid-state imaging device, and the straight-line component is emitted from the eyepiece window of the finder. If this is applied to a composite camera as it is, there is a problem that a high-quality image for recording cannot be captured.

Further, when the superimpose function is applied to the compound camera, a serious problem occurs in that the superimpose display is reflected during image recording.

Therefore, the present invention provides a complex camera which can perform imaging with the two imaging systems at the same timing without parallax between the imaging screens of the two imaging systems, and can use an optical viewfinder. It is intended to be realized in form.

Another object of the present invention is to provide a camera which can be used both as an image sensor for recording an electronic image and an element for measuring the luminance of a subject when taking an image on a photographic film.

It is a further object of the present invention to provide a camera capable of obtaining an electronic image without reflection of superimposed display.

[0020]

In order to achieve the above object, according to the first aspect of the present invention, an object light is made to enter a first divided light which enters a first image pickup means and to a second image pickup means and a finder means. Light splitting means for splitting the light into second split light, and optical path switching means for causing the second split light to enter the finder means when the first imaging means does not image and to enter the second imaging means when imaging by the first imaging means And a synchronizing means for synchronizing the imaging timing of the first imaging means and the timing of incidence of the second split light on the second imaging means by the optical path switching means.

That is, according to the present invention, the present invention is applied to a single-lens camera in which object light incident from an objective lens is divided into a first image pickup means side, a second image pickup means and a finder means side by a half mirror or the like. After preventing parallax from occurring between the imaging screens of the two imaging units, the optical path switching unit switches the optical path between the finder unit side and the second imaging unit side. A high-definition finder image can be obtained. Further, by switching the optical path from the finder to the second imaging unit in synchronization with the imaging timing of the first imaging unit, the first imaging unit and the second imaging unit can take an image at the same timing. In addition, the finder image can be prevented from disappearing before the image capturing.

Here, the second divided light is made incident on both the finder means and the second image pickup means when the first image pickup means does not pick up an image. It is desirable to perform object (subject) luminance measurement.

Specifically, when the first imaging means captures an image, the straight component on the mat surface of the second divided light is made incident on the second imaging means, and when the first imaging means does not capture an image, the straight component is removed. The image is recorded on the basis of the image data of the first effective imaging area, and the image is recorded on the basis of the image data of the second effective imaging area so that the light is incident on the finder means and the diffusion component on the mat surface is incident on the second imaging means. In this case, the subject brightness may be measured.

According to the second aspect of the present invention, an optical path is set so that the straight component of the object light on the mat surface is incident on the image pickup means, and the diffuse component on the mat surface is imaged while the straight component is incident on the finder means. In a camera having an optical path switching means for selectively setting an optical path to be incident on the means, the imaging means includes a first effective imaging area for receiving the linear component and a second effective imaging area for receiving the diffuse component. Provided.

That is, according to the present invention, even if the incident positions of the object light (straight component and diffuse component) on the image pickup means differ according to the optical path switching, the image recording for image recording is performed in the effective image pickup area corresponding to each incident position. By performing the subject luminance measurement imaging, both the image recording and the subject luminance measurement can be performed without parallax by one imaging unit.

In this case, the size of the image pickup pixels in the second effective image pickup area is made larger than the size of the image pickup pixels in the first effective image pickup area, so that the noise level of the photometric output is lowered, and more accurate. The measurement of the subject brightness may be possible.

According to a third aspect of the present invention, there is provided a camera having display means disposed in an optical path of object light incident on an image pickup means and a finder means, wherein the display means performs a display in the finder by blocking the object light or by illuminating light. In addition, at the time of imaging by the imaging means, the display in the viewfinder by the display means is regulated.

That is, according to the present invention, the display in the viewfinder is not reflected in the photographed image by blocking the object light or applying illumination light to the object light in order to perform the display in the viewfinder at the time of imaging by the imaging means. Like that.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 and 2 show a composite camera according to a first embodiment of the present invention. The composite camera includes a first imaging system that records an image on a photographic film,
And a second imaging system that photoelectrically converts an image with a CCD area sensor and records the image as an electrical signal in a memory built in the camera. 1 shows an imaging state, and FIG. 2 shows an object image observation state.

In these figures, 1 is a camera body, 2
Denotes a camera-side mount for mounting various objective lenses (not shown); 101, an optical axis of the objective lens; 102, a photographic film serving as an imaging surface of a first imaging system; 3, a focal plane shutter; This is a magnetic head for writing and reading magnetic information. This first
Is known as a single-lens reflex camera technology.

Reference numeral 103 denotes a main mirror (pellicle mirror) made of a semi-transmissive film fixedly arranged on the optical axis 101 of the objective lens, and transmits the object light incident from the objective lens 103 to the first image pickup system. Incident light (first split light in the claims) and a finder system and a second
And a light splitter for splitting the light into an incident light (second split light in the claims) into the imaging system.

Next, the focus detection system will be described. 10
Reference numeral 4 denotes a first reflecting mirror obliquely arranged on the optical axis 1 of the objective lens, 105 denotes a paraxial imaging surface conjugated to the imaging surface 102 folded by the first reflecting mirror 104, and 106 denotes a plane mirror. A certain second reflecting mirror, 109 is a re-imaging lens block having a reflecting mirror in which aluminum or the like is locally deposited on two concave surfaces arranged in the depth direction of the paper, 107 is an infrared cut filter, 111 is a pair of 2 This is a focus detection area sensor having a two-dimensional light receiving area.

Each light receiving area is composed of a plurality of sensor rows composed of a large number of pixels having the same aperture, and the sensor rows also form a pair. The image formation state of the objective lens can be known by comparing the phases between the outputs of the pair of sensor arrays.

The first reflecting mirror 104 is an elliptical mirror, and the two focal points defining the ellipse move the optical path after the ray on the optical axis 101 of the objective lens is refracted by the main mirror 103 to the objective lens side in reverse. On the extended line and the light beam
4 are respectively located on the extended lines of the optical path after being reflected. The pair of reflecting mirrors of the re-imaging lens block 109 are also elliptical mirrors. The first reflecting mirror 104 also functions as a field mask that limits the focus detection area, so that only the necessary area reflects light. In addition,
The optically functioning portions of these components are all configured symmetrically with respect to the paper.

Next, the finder system will be described.
Reference numeral 11 denotes a focusing screen having a flat light incident surface and a matte surface 11a, and 13 a liquid crystal display for superimposing and displaying a focus point, a photographing range, and the like in a viewfinder view. A display lens 15; a condenser lens 15 made of glass having a high refractive index; 12, a penta roof mirror; 16, a movable mirror (optical path switching means); and 14, an eyepiece. The exit surface side of the eyepiece 14 serves as an eyepiece window.

An object image is formed on the mat surface 11a of the focusing screen 11 by the reflected light from the main mirror 103. The luminous flux transmitted through the focusing screen 11 passes through the liquid crystal display 13 and the condenser lens 15 and enters the inside of the penta roof mirror 12, and the roof surfaces 12b and 12 provided on the front and back of the paper with 12g as a ridge line.
After being reflected once each at c, the light reaches the movable mirror 16, where it is reflected again and heads toward the eyepiece 14. The position of the movable mirror 16 is controlled by a mirror driving mechanism to be described later, and can selectively take a position shown in FIG. 2 (hereinafter, referred to as an observation position) and a position shown in FIG. 1 (hereinafter, referred to as an imaging position). In the observation position of FIG.
When the mat surface 11a of the focusing screen is viewed through the camera, the object image can be observed as an erect erect image.

Next, the second image pickup system will be described. The second imaging system is configured so as to partially share the optical path with the above-described finder system. Reference numeral 4 denotes a stop having a circular opening, 5 denotes a convex lens, 6 denotes a reflecting mirror, 7 denotes a concave lens, and 8 denotes an area sensor such as a CCD which is a solid-state image sensor. Convex lens 5
And the concave lens 7 constitute an imaging optical system. These are optical axes 101 when the movable mirror 16 is at the imaging position shown in FIG.
And coaxial.

The luminous flux of the object image formed on the focusing screen 11 is diffused on the mat surface 11a and enters the penta roof mirror 12. The light beam passing through the aperture of the stop 4 is converged by the convex lens 5 and enters the concave lens 7 via the reflecting mirror 6. The concave lens 7 is provided to correct the curvature of the image plane, and an object image on the focusing screen 11 is favorably reduced and formed on the area sensor 8 of the second imaging system. Condenser lens 1
Instead of using a glass with a high refractive index for 5, the light incident surface of the focusing screen 11 is a flat surface and there is no Fresnel lens here, so that moire does not occur when the area sensor 8 samples an object image.

As described above, the focusing screen 11
When the movable mirror 16 is at either the imaging position or the observation position, the state of the object image can be known as the output of the area sensor 8 by re-imaging the light beam that has passed through. When the movable mirror 16 is at the observation position, the output of the area sensor 8 is used for detecting the object luminance, and when the movable mirror 16 is at the imaging position, it is used for capturing an image.

Further, when the movable mirror 16 is at the image pickup position, the image forming optical system of the convex lens 5 and the concave lens 7 is
Coaxially, the degree of blurring of the object image on the focusing screen viewed through the viewfinder is reproduced on the area sensor 8 almost as it is. At this time, due to the diffusion effect of the mat surface 11a, even if the exit pupil position is different between the various types of objective lenses, it is difficult for the light amount to drop at the peripheral portion of the screen.

If the intensity of the light deflecting action that causes light diffusion on the mat surface 11a is not uniform on the mat surface 11a, the object image of the finder appears rough to the naked eye. This phenomenon is remarkable when the taking lens is narrowed down or when a dark taking lens is attached. In a specific area where a large number of discrete elements exist on the matte surface 11a, most of the diffused rays cannot pass through the eyepiece window. It is a phenomenon that occurs. However, if the structure of the mat 11a of the focusing screen is made sufficiently smaller than the sampling pitch of the area sensor 8, no problem occurs for the second imaging system. The image picked up by the second image pickup system can be observed on the liquid crystal display device 10 in the display unit 9 provided on the back side of the camera body 1. The display unit 9 rotates around the rotation axis 20 and can be stored at a position indicated by a dotted line 9 'when observation with the liquid crystal display device 10 is not required.

Next, the mirror driving mechanism will be described with reference to FIGS. This mirror driving mechanism is a movable mirror 1
6. The positions of the first reflecting mirror 104, the second reflecting mirror 106, and the eyepiece shutter 305 are shown in FIGS. 3A and 3B when photographing with the second imaging system shown in FIG. 4 (when photographing with the first imaging system). FIG. 3 shows a configuration for switching between observation of an object image by a finder system (non-imaging by a first imaging system).

Reference numeral 301 denotes a main operating lever urged in the direction of arrow A by a spring (not shown), and 303 denotes a first reflecting mirror 1.
A focus detection mirror driving lever holding the mirror 04 and the second reflecting mirror 106, a finder mirror driving lever 302 holding the movable mirror 16, an eyepiece shutter driving lever 304 supporting the eyepiece shutter 305, and a camera driving lever 312 Pressing the release button (S described later)
W2) is an activation lever (part of which is shown in the figure) that is activated in conjunction with W2).

The main operating lever 301 is rotatable about a shaft 301a, and is used when observing an object image.
2 and the first arm 301b come into contact with each other so that the arrow A
The rotation in the direction indicated by arrow A is accompanied by the movement of the activation lever 312 in the direction indicated by arrow C during imaging. Note that the activation lever 312 and the main operation lever 301 correspond to a synchronizing means described in claims.

When the main operation lever 301 rotates, the focus detection system mirror drive lever 303, the finder system mirror drive lever 302, and the eyepiece shutter drive lever 304 operate in conjunction with each other to perform predetermined operations. The main operating lever 301 and the finder mirror driving lever 302
Constitutes an optical path changing means referred to in the claims. First, the operation of the focus detection system mirror drive lever 303 will be described. The focus detection system mirror drive lever 303 is
It is rotatable around 03a and is urged in the direction of arrow B by a spring (not shown). A pin 301d is provided on the second arm 301c of the main operating lever 301, and the U-shaped arm 30 of the focus detection mirror driving lever 303 is provided.
3b.

At the time of observing the object image shown in FIG. 3, the focus detection system mirror drive lever 303 is urged in the direction of arrow B so that the focus detection system mirror stopper 308 and the focus detection system mirror drive lever 303 come into contact with each other. 1 reflector 104
And the position of the second reflector 106 for focus detection is accurately determined, and a gap is generated between the pin 301d of the main operation lever 301 and the U-shaped arm 303b of the focus detection mirror drive lever 303. Therefore, if the focus detection system mirror stopper 308 is constituted by an eccentric pin as shown in the figure, the position of the first reflection mirror 104 and the second reflection mirror 106 can be adjusted extremely precisely by the rotation of the focus detection system mirror stopper 308. It is possible to do.

On the other hand, at the time of the image pickup shown in FIG.
The focus detection system mirror driving lever 303 comes into contact with the pin 301 d to rotate in the direction indicated by arrow B in FIG.
Rotate in the opposite direction. As a result, the first reflecting mirror 1
04 and the second reflecting mirror 106 are retracted outside the imaging optical path of the first imaging system.

Next, the finder mirror driving lever 3
02 and the operation of the eyepiece shutter drive lever 304 will be described. Finder mirror drive lever 30
Reference numeral 2 denotes a main operating lever 3 which is rotatable about a shaft 302a.
01 and the U-shaped arm 30 of the finder mirror driving lever 302
2b is loosely engaged.

At this time, a pedestal 311 supporting the leaf springs 309 and 310 is fixed on the finder mirror driving lever 302. The leaf springs 309 and 310 abut on the pin 301f according to the state of the main operation lever 301,
The bias in the direction to pinch the pin 301f urges the viewfinder mirror driving lever 302 to rotate in an appropriate direction.

At the time of observing an object image, the leaf spring 309 comes into contact with the spring stopper 302c provided on the finder mirror driving lever 302 and does not come into contact with the pin 301f. On the other hand, the leaf spring 310 is
1f and the viewfinder mirror drive lever 302
, A rotational force in the direction of arrow D is generated. Further, since the first finder mirror stopper 306 is located in the rotation direction of the arrow D of the finder mirror drive lever 302, the movable mirror 16 is positioned in the closing direction.

At the time of imaging, the leaf spring 310 contacts the spring stopper 302c provided on the finder mirror driving lever 302, and does not contact the pin 301f.
On the other hand, the leaf spring 309 comes into contact with the pin 301f to generate a rotational force in the direction of arrow E on the finder mirror driving lever 302. Since the second finder mirror stopper 307 is located in the rotation direction of the arrow E of the finder mirror driving lever 302, the movable mirror 16 is positioned in the opening direction. The first and second finder mirror stoppers 30
Reference numerals 6 and 307 denote eccentric pins as shown in the figure, and the rotation of the movable mirror 16 enables precise position adjustment.

An eyepiece shutter driving lever 304 is further connected to the finder mirror driving lever 302 so as to be driven. The eyepiece shutter drive lever 304 rotates about a shaft 304a, and the U-shaped arm 3
04b engages with a pin 302d provided near the tip of the finder mirror driving lever 302. At the same time as the movable mirror 16 moves to the position shown in FIG. 4, the eyepiece shutter 305 fixed to the tip of the eyepiece shutter drive lever 304 is inserted between the eyepiece 14 and the penta roof mirror 12, and the eyepiece shutter 30
5 closes. Thereby, it is possible to prevent harmful light (reverse incident light) from entering the camera through the eyepiece lens 14 in reverse.

The camera configured as described above is driven and controlled by the control unit shown in FIG. In FIG. 5, S
W1 and SW2 are switches which are turned on by half-pressing and full-pressing a release button (not shown), respectively.
1 is an area sensor drive circuit for driving and controlling the area sensor 8; 204 is an LCD drive circuit for driving the liquid crystal display device 10; 208 is a focus detection circuit having a number of focus points; A display circuit 203 for displaying a focus point, a photographing screen range, and the like in the viewfinder, and a film sensitivity information input circuit 203 for taking in photographic film sensitivity information

A motor drive circuit 208 drives each mirror and winds up the photographic film.
3 is a motor connected to the motor drive circuit 208, 2
Reference numeral 09 denotes a shutter drive circuit that drives the focal plane shutter 3, reference numeral 210 denotes an aperture drive circuit that controls the aperture of the attached objective lens, and reference numeral 207 denotes the photographic film 102.
A magnetic data recording / reading circuit for writing / reproducing magnetic data to / from the magnetic disk; a signal processing circuit 214 for signal-processing the output of the area sensor 8; a memory 206 for recording image data of the second imaging system; This is a system controller that controls each circuit. The system controller 205 is a CPU, RAM, ROM, EE
It is composed of a PROM or the like. The above-described focus detection area sensor 111 is a component of the focus detection circuit 208, and the magnetic head 21 is a component of the magnetic data recording / reading circuit 207.

Next, the operation of the control unit will be described with reference to FIG. The flow program of FIG. 6 is stored in the ROM in the system controller 205. In step # 401, it is determined whether or not the release button has been pressed at least halfway to turn on the switch SW1. If the button has not been pressed, the same step is repeated. If the button has been pressed, the process proceeds to step # 402.

In step # 402, the ISO sensitivity of the photographic film loaded in the camera is obtained from the film sensitivity information input circuit 203.

In step # 403, the amplifier gain for the output of the area sensor 8 is set based on the ISO sensitivity of the photographic film so that the shutter speeds of the first and second image pickup systems are substantially the same, and the area sensor drive is performed. An amplifier gain is instructed to the circuit 201. At this time, if the ISO sensitivity of the photographic film is extremely low or extremely high and an ideal amplifier gain cannot be set, the finder display circuit 21 will be described later.
1 indicates that fact.

FIG. 7 is a flowchart for explaining the processing in step # 403 in more detail. This flow program is also stored in the ROM in the system controller 205.
Is stored in

In step # 501, an amplifier gain is set according to the ISO sensitivity of the photographic film in order to make the shutter speed of the first imaging system close to the shutter speed of the second imaging system. When a high sensitivity photographic film is loaded, the amplifier gain is increased, and when a low sensitivity photographic film is loaded, the amplifier gain is decreased. At this time, since the settable range of the amplifier gain is narrower than the width of the ISO sensitivity of the photographic film, an ideal amplifier gain cannot always be set.

In step # 502, the difference between the amplifier gain set in the previous step and the ideal amplifier gain is calculated.

In Step # 503, Step # 502
It is determined whether the value calculated in step 2 is equal to or less than two steps. If it is not two or less, the process proceeds to step # 504, and if it is two or less, the subroutine is terminated.

In step # 504, the warning mark 135 shown in FIG.
Is displayed on the liquid crystal display device 13 and the subroutine ends. Returning to the main flow, in step # 404, the area sensor 8 is driven to photoelectrically convert the object image, and the subject brightness is calculated based on a predetermined calculation. At the time of observing the object image shown in FIG. 2, a straight component of light transmitted through the mat surface 11 a is guided to the eyepiece 14, and a diffuse component is guided to the diaphragm 4 instead. At this time, the second imaging system and the objective lens are not coaxial. This means that the position of the object image on the area sensor 8 varies depending on the position of the movable mirror 16. Therefore, FIG. 8 (at the time of imaging) and FIG.
As shown in (observation of object image = at the time of photometry), the effective pixel range on the area sensor 8 is changed, and an image without parallax is captured at the time of photometry and at the time of imaging while using a single area sensor. Can be realized.

In FIG. 8, reference numeral 150 denotes the area sensor 8.
A light receiving area 151 as a whole as a whole is an effective pixel range (first effective imaging area in claims) at the time of imaging. This effective pixel range 151 is made to coincide with the range of the object image indicated by oblique lines. On the other hand, in FIG. 9, reference numeral 152 denotes a range of an object image at the time of observing the object image, and 153 denotes an effective pixel range (a second effective imaging area in the claims). Effective pixel range 1
Numeral 53 not only has a different position from the effective pixel range 151, but also has a poor imaging performance due to a light beam obliquely passing through the imaging optical system when observing an object image.
The setting is slightly smaller than the range 152 of the object image.

In step # 405, the photographic film I
An appropriate aperture value and shutter speed of the objective lens are calculated from the information on the SO sensitivity and the subject brightness. The calculated aperture value and shutter speed are displayed on the liquid crystal display 13 via the display circuit 211 in the finder, and are displayed as a superimposed display in the finder.

FIG. 10 shows a state where the display contents displayed on the liquid crystal display device 13 are observed through a finder optical system. In this figure, 130 is a finder field of view, 132 is a shading display indicating that the shooting screen is set to the panorama screen mode, 136 is an aperture value, 133 is a shutter speed of the first imaging system, and 134 is a second imaging mode. The system shutter speed 135 is a warning mark indicating that there is a difference of a predetermined amount or more between the shutter speed 133 of the first imaging system and the shutter speed 134 of the second imaging system.

In step # 406, the focus detection circuit 20
The second focus detection area sensor 111 is driven, and the focus state of the objective lens is detected based on the output. As a result, if there is a defocus, the position of the objective lens on the optical axis 101 is adjusted.

The main subject area in focus with the focus point is displayed on the liquid crystal display 13 via the display circuit 211 in the finder, and is displayed as a superimposed display in the finder. Of the focus points 131 shown in FIG.
Reference numeral 7 denotes a focused main subject area.

At step # 407, it is checked whether or not the shutter button is completely depressed and the switch SW2 is turned on. If it has not been pushed, the process returns to step # 401. If it has been pushed, step # 4 follows.
The process proceeds to 08 to enter the imaging operation.

In step # 408, the aperture driving circuit 21
For 0, an instruction is issued to narrow the aperture of the objective lens to the value calculated in step # 405.

In step # 409, the motor 212 is controlled via the motor drive circuit 208 to move the activation lever 312 shown in FIG. Following this, the first reflecting mirror 104 and the second reflecting mirror 106 for focus detection are retracted out of the imaging optical path, the movable mirror 16 is moved from the observation position to the imaging position, and the eyepiece shutter 305 is closed. Movement to the eye is performed.

In step # 410, the area sensor 8
In order to prevent the superimposed display in the viewfinder from appearing in the image captured by the camera, all the contents displayed on the liquid crystal display 13 of the display circuit 211 in the viewfinder are temporarily turned off as shown in FIG. However, at this time, since the eyepiece shutter 305 has already been operated, this state cannot be seen through the viewfinder.

In step # 411, the shutter drive circuit 209 is driven to operate the focal plane shutter 3 at the shutter speed calculated in the previous step # 405.
Is operated to perform imaging of the first imaging system.

In step # 412, the CCD 8 is driven via the area sensor drive circuit 201, photoelectrically converts the object image formed on the focusing screen 11, and picks up the image by the second image pickup system. This step # 412 and the previous step # 411 operate at timings that can be regarded as substantially simultaneous, and simultaneous imaging by two imaging systems is performed. As a result, it is possible to prevent the finder image from disappearing before imaging.

In step # 413, the area sensor 8
After processing the output of the memory 2 by the signal processing circuit 214,
06.

In step # 414, the motor 212 connected to the motor drive circuit 208 is controlled to return the position of the actuation lever 312 to the position shown in FIG. 3, and the first reflection mirror 104 for focus detection and the second The reflecting mirror 106, the movable mirror 16, and the eyepiece shutter 305 are returned to the positions at the time of observing the object image.

At step # 415, the motor drive circuit 208 is instructed to feed the photographic film, and the motor drive circuit 208 controls the motor 213 to prepare for the next frame.

In step # 416, a magnetic recording instruction is issued to the magnetic data recording / reading circuit 207, and photographing data and identification information of the scene are recorded on the magnetic recording layer on the photographic film during the film feeding. The shooting data includes shooting screen information such as panorama, aperture value, shutter speed of the first imaging system, shutter speed of the second imaging system, and the like.

When the image recorded on the photographic film by the first image pickup system is read by a film scanner and converted into digital data, the identification information corresponds to the image data picked up by the second image pickup system. It is effective for

In step # 417, the LCD driving circuit 2
04, the image information recorded in the memory 206 is displayed on the display unit 9
Is displayed on the liquid crystal display device 10.

(Second Embodiment) FIGS. 12 and 13 show a second embodiment of the compound camera according to the second embodiment of the present invention.
The area sensor 160 of the imaging system is shown. FIG. 12 shows the time of imaging, and FIG. 13 shows the time of object image observation, that is, the time of photometry. The configuration of the camera according to the present embodiment other than the area sensor 160 is the same as that of the first embodiment.

As in the first embodiment, when observing an object image, the second image pickup system and the objective lens are not coaxial, and the straight component of the light transmitted through the matte surface 11a is
, And a diffusion component is guided to the diaphragm 4. On the other hand, during imaging, the second imaging system and the objective lens are coaxial, and
The straight component of the light transmitted through the matte surface 11 a is guided to the diaphragm 4, and the diffuse component is guided to the eyepiece 14.

This means that the position of the object image on the area sensor 160 differs depending on the position of the movable mirror 16. At the time of observing an object image, the luminance of the subject is measured in order to determine the aperture value and shutter speed of the taking lens prior to exposure to the photographic film. In order to appropriately measure the light of the imaging range of the second imaging system, the pixel area used at this time may be switched. 161 and 162 are light receiving areas on the area sensor 160. The light receiving region (first effective imaging region in the claims) 161 is divided into an extremely large number of pixels, and the light receiving region (second effective imaging region in the claims) 162 is divided into, for example, seven regions.

At the time of imaging shown in FIG. 12, the object image is formed in the effective pixel range 161, and the range of the object image indicated by oblique lines coincides with the light receiving area 161. On the other hand, at the time of observing the object image shown in FIG. 13, the range of the object image is set at a position centered on the position of the light receiving region 162, so that mainly the central portion of the object image can be measured.

As described above, if the effective pixel range on the area sensor 160 is changed between the time of imaging and the time of observing an object, an appropriate range is obtained for each of the time of imaging and the time of observing an object using a single area sensor. An image can be captured. Moreover, in the present embodiment, since the size of the photometric pixel is set to be larger than the size of the imaging pixel, the noise level of the photometric output becomes lower,
More accurate measurement of the subject brightness becomes possible.

[0085]

As described above, according to the first aspect of the present invention, a single-lens type camera that divides object light incident from an objective lens into a first imaging means side, a second imaging means, and a finder means side. Therefore, it is possible to reliably prevent the occurrence of parallax between the imaging screens of both imaging units. In addition, since the optical path of the divided light is switched between the finder means side and the second imaging means side by the optical path switching means, a high-definition finder image can be obtained at low cost using the optical finder. Further, since the optical path is switched from the finder to the second imaging unit in synchronization with the imaging start timing of the first imaging unit, the first imaging unit and the second imaging unit perform imaging at the same timing. Can be started, and the disappearance of the finder image before imaging can be prevented.

Further, according to the second aspect of the present invention, even if the incident positions of the object light (straight component and diffusion component) on the image pickup means differ according to the optical path switching, the effective image pickup areas corresponding to the respective incident positions can be obtained. Since imaging for image recording and imaging for subject brightness measurement can be performed, both image recording and subject brightness measurement can be performed without parallax by one imaging unit.

In this case, if the size of the image pickup pixel in the second area is made larger than the size of the image pickup pixel in the first area, the noise level of the photometric output becomes lower.
More accurate measurement of subject luminance can be performed.

Further, according to the third aspect of the present invention, at the time of imaging by the imaging means, the object light is not blocked or illumination light is not added to the object light in order to perform display in the viewfinder. It is possible to reliably prevent the display in the viewfinder from being reflected.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a compound camera (at the time of imaging) according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the composite camera (at the time of observing an object image).

FIG. 3 is an explanatory diagram of an optical path switching mechanism in the compound camera (at the time of observing an object image).

FIG. 4 is an explanatory diagram of an optical path switching mechanism in the composite camera (at the time of imaging).

FIG. 5 is a block diagram of a control unit of the camera.

FIG. 6 is a flowchart showing the operation of the control unit.

FIG. 7 is a flowchart showing an operation (gain setting operation) of the control unit.

FIG. 8 is an explanatory diagram of an area sensor of the camera (at the time of imaging).

FIG. 9 is an explanatory diagram of an area sensor of the camera (at the time of observing an object image = at the time of photometry).

FIG. 10 is an explanatory diagram of a display in a viewfinder of the camera.

FIG. 11 is an explanatory diagram of a display in a finder of the camera.

FIG. 12 is an explanatory diagram of an area sensor of a compound camera (at the time of imaging) according to a second embodiment of the present invention.

FIG. 13 is an explanatory diagram of an area sensor of the compound camera (at the time of observing an object image = at the time of photometry) according to the second embodiment.

[Explanation of symbols]

 Reference Signs List 1 camera body 3 focal plane shutter 8 imaging area sensor (second imaging means) 10 liquid crystal display device 11 focusing screen 13 liquid crystal display device for display in viewfinder 14 eyepiece lens 15 condenser lens 16 movable mirror 102 photographic film (first imaging means) ) 103 Main mirror 111 Focus detection area sensor 301 Main operating lever 302 Finder mirror driving lever 304 Eyepiece shutter driving lever 305 Eyepiece shutter 151, 161 Effective pixel range (first effective imaging area) 152, 162 Effective pixel range (Second) Effective imaging area)

Claims (7)

[Claims] A light splitting means for splitting the object light into a first split light incident on a first image pickup means and a second split light incident on a second image pickup means and a finder means; An optical path switching unit that causes the light to enter the finder unit when the first imaging unit does not capture an image, and causes the second imaging unit to enter the image when the first imaging unit captures an image; an imaging timing of the first imaging unit; And a synchronizing means for synchronizing the timing at which the second split light is incident on the second imaging means by the means. 2. The apparatus according to claim 1, wherein the optical path switching unit causes the second divided light to enter both the finder unit and the second imaging unit when the first imaging unit does not capture an image. The described camera. 3. The optical path switching means, when imaging by the first imaging means, causes a straight component on the mat surface of the second divided light to enter the second imaging means, and causes the first imaging means to perform a non-lighting operation. At the time of imaging, the linear component is made incident on the finder means, and the diffuse component on the mat surface is converted into the second component.
The camera according to claim 2, wherein the light is incident on an imaging unit. 4. An optical path for setting a straight component on the mat surface of the object light to be incident on the image pickup means, and an optical path for setting the straight component to be incident on the finder means and causing the diffuse component on the mat surface to be incident on the image pickup means. A camera having an optical path switching means for selectively performing setting, wherein the imaging means is provided with a first effective imaging area for receiving the linear component and a second effective imaging area for receiving the diffuse component. Features camera. 5. The camera according to claim 4, wherein image recording is performed by imaging in the first effective imaging area, and object luminance measurement is performed by imaging in the second effective imaging area. 6. The imaging device according to claim 4, wherein the size of the imaging pixel in the second effective imaging region is larger than the size of the imaging pixel in the first effective imaging region.
Or the camera according to 5. 7. A camera having display means disposed in an optical path of object light incident on an image pickup means and a viewfinder means for blocking the object light or performing display in the viewfinder by illumination light, wherein at the time of image pickup by the image pickup means, A camera for regulating display in the viewfinder by the display means.