JPH09297348A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera equipped with two photographing parts and performing rapid photographing in a consecutive photographing mode. SOLUTION: Light transmitted through a photographing lens L is divided by a half mirror C04, one divided light is guided to a silver salt film C08, and the other divided light is guided to a photoelectric transducer (CCD) C21 through a relay optical system, whereby photographing is performed. The focusing condition of the image of the film C08 is detected by disposing a mirror C05 capable of retreating to an optical path from the mirror C04 to the film C08, and using the reflected light with a phase difference detection system. The focusing condition of the image of the CCD is detected by a contrast detection system. A single photographing mode and the consecutive photographing mode are provided on the photographing by means of the film C08, the first photographing in the consecutive mode is performed after the focusing condition of the image of the film C08 is detected and the focusing position of the lens L is adjusted based on the detection result. In the case of the second and succeeding photographing in the consecutive mode, the mirror C05 is held on the retreating position without detecting the focusing condition of the image of the film C08.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera that splits light transmitted through a photographing lens to photograph a still image with a silver salt film and a video with a photoelectric conversion element.
In particular, it relates to detection of an in-focus state when continuously shooting with a silver salt film.

[0002]

2. Description of the Related Art In addition to a single shooting mode in which one frame is shot each time the shutter release button is pressed, a camera which shoots with a silver halide film has a function of continuously shooting a plurality of frames while the shutter release button is held down. Some have a continuous shooting mode for shooting. The continuous shooting mode is suitable for recording the movement of the shooting target as a series of still images.

Since it is not possible to detect the in-focus state of an image to be photographed by exposing the silver salt film to light, the light from the photographing lens is branched so that the branched light is equivalent to the surface of the silver salt film. It is performed indirectly by forming an image and detecting the focused state. It is common to split the light by placing a mirror on the optical path from the shooting lens to the silver salt film, but this mirror creates a shadow on the silver salt film when it is resident in the optical path. Sometimes they are evacuated outside the optical path.

In the conventional continuous shooting mode of the camera, the focus state is detected and the focus position of the photographing lens is adjusted before the first frame is photographed, and then the mirror for detecting the focus state is used. The film is repeatedly fed and the shutter is opened / closed while the first frame is held in the retracted position. That is, the detection of the in-focus state and the adjustment of the focal position of the photographing lens are performed only in the photographing of the first frame.

By the way, in recent years, the light from the object to be photographed that has passed through the photographing lens and is incident is divided into two, and one of the divided lights is guided to a silver salt film and the other is guided to a photoelectric conversion element (CCD) to perform photography. Cameras that shoot video have been proposed. This camera is used for still image shooting with silver halide film and C
It is possible to perform moving image shooting with a CD individually or both in parallel and at the same time. Since the still image and the moving image are formed by forming the same light that has passed through the photographing lens, the photographing angles are the same. If shooting is performed with a silver salt film during shooting of a moving image, this still image is obtained by extracting one frame of a continuous moving image. Moreover, due to the high resolution peculiar to the silver salt film, it is possible to obtain a high-quality image that is different from the image obtained by simply stopping the moving image by the CCD.

In such a camera as well, it is desirable to provide a single shooting mode and a continuous shooting mode for shooting with a silver salt film so that shooting can be performed by appropriately switching the modes. If shooting with a silver salt film is performed in continuous shooting mode during shooting with a CCD, a continuous moving image and a series of still images such as decomposed photographs of the moving image can be obtained with high resolution.

[0007]

However, as in the conventional case, when the object to be photographed moves unless the focus state is detected and the focus position of the photographing lens is adjusted in the second and subsequent frames in the continuous photographing mode, The images taken after the second frame are unclear images that are out of focus. In this case, the feature of the high-resolution silver salt film is not utilized.

In the second and subsequent frames, as in the case of the first frame, the focus state detection mirror is positioned on the optical path to the silver halide film, and the focus state is detected and the focus position based on the result is detected. With adjustment, it is possible to capture a clear image. However, the mirror operation of returning from the retracted position to the optical path and re-evacuating from the optical path is required, and the shooting of each frame is delayed by the time required for this mirror operation. The main purpose of the continuous shooting mode is to satisfy the quick shooting property. Therefore, if it takes too much time from the shooting of one frame to the shooting of the next frame, the significance itself of the continuous shooting mode will be impaired.

SUMMARY OF THE INVENTION It is an object of the present invention to avoid a delay in continuous shooting caused by the retracting and returning operations of the focus state detecting mirror in a camera having two shooting units and a continuous shooting mode.

[0010]

In order to achieve the above object, according to the present invention, a light splitting means for splitting light from an object to be photographed into first light and second light, and a first light receiving means. A first photographing means for photographing an image of the lever light, a second photographing means for photographing the image of the light by receiving the second light, and a focus position adjustable so that light from an object to be photographed is emitted. A first optical system that guides the splitting means, a second optical system that guides the second light from the light splitting means to the second photographing means, and an in-focus state of the image of the first light in the first photographing means. And a first detection means for detecting the focus state of the first optical image detected by the first detection means, and the focus position of the first optical system is detected according to the detected focus state. Is adjusted to perform the first photographing by the first photographing means, and the first detecting means can detect the in-focus state of the image of the first light. Without the first photographing means provided continuous shooting mode for shooting the second and subsequent.

The focal position of the first optical system is the first position after division.
Influences the focused state of the second light and the focused state of the second light. First
A continuous shooting mode is provided for shooting by the shooting means, and the focus state of the image is detected and the focus position of the first optical system is adjusted prior to the first shooting in the continuous shooting mode. The detection of the in-focus state at this time is performed on the first light image on the first imaging unit by the first detection unit. The first detecting means has, for example, a mirror movable between a position on the optical path of the first light and a position outside the optical path, and detects the in-focus state by the mirror reflected light. You can In this case, the mirror is positioned on the optical path during the detection of the focused state, and is positioned outside the optical path after the detection of the focused state.

In the second and subsequent photographings in the continuous photographing mode, the first detecting means does not detect the in-focus state of the image of the first photographing section. Therefore, when the first detecting means has the mirror, the mirror can be held outside the optical path after the first photographing. The focus position of the first optical system may or may not be adjusted in the second and subsequent shootings.

The first shooting in the continuous shooting mode is performed after detecting the in-focus state and adjusting the focus position accordingly, so that the image is in focus. Images captured after the second time are in focus when there is no change in the relative position between the subject and the camera. Also, focusing can be achieved when adjusting the focus position of the first optical system. If the focus position of the first optical system is not adjusted and the relative position between the object to be photographed and the camera changes, the images photographed after the second time will be out of focus.

The camera having the above structure further includes second detecting means for detecting the in-focus state of the image of the second light in the second photographing means, and in the continuous shooting mode, the second detecting means detects the second state. The in-focus state of the image of the second light is detected, and the focus position of the first optical system is adjusted according to the detected in-focus state.
The second and subsequent photographing operations may be performed by this photographing means.

As described above, the focus position of the first optical system affects the in-focus state of the first light and the in-focus state of the second light. The focused state of the image of the first light in the first photographing means can be indirectly detected from the focused state of the image. Therefore, by adjusting the focus position of the first optical system according to the focus state detected by the second detection means, it is possible to bring the image of the first imaging unit into focus. When the second and subsequent shootings are performed in this manner, not only the first image but also the first image is focused in the continuous shooting mode.

When the first detecting means has the above-mentioned mirror, in the second and subsequent photographing operations,
The in-focus state of the image of the first imaging unit can be detected with the mirror held outside the optical path.

Specifically, it is assumed that the first photographing means performs photographing by exposing a silver salt film to light.
The detecting means is provided with a mirror movable between the position on the optical path of the first light and the position outside the optical path. The first detecting means detects the in-focus state of the image of the first light in the first photographing means by the light reflected by the mirror. In the continuous shooting mode, after detecting the in-focus state of the image of the first light, the mirror is held at a position outside the optical path of the first light.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a camera of the present invention is shown in FIG. In this camera, the camera body C and the taking lens L are separately configured, and various interchangeable lenses can be attached to the camera body C. Here, as an example, a case where a zoom lens is mounted as the taking lens L is shown.

The camera splits the light that has passed through the taking lens L and is incident into two light fluxes, guides one light flux to the silver salt film to expose the silver salt film for recording, and records the other light flux. This is a configuration in which a video signal is recorded by being led to a photoelectric conversion element (CCD). The camera body C is provided with a display device, and displays the video signal generated from the output of the CCD, so that the CCD and the display device also function as a finder. Before explaining each component of the camera, an outline of the function and operation of the camera will be described.

<Photographing Mode> The camera photographs in any of the following four modes. PH mode: Only shooting with a silver salt film is performed. MV mode: Only moving image video recording by CCD is performed. PM mode: Simultaneous shooting with silver halide film and moving picture video with CCD. SV mode: Capture and record still video. Furthermore, in shooting with a silver salt film in the PH mode and the PM mode, there are a single shooting mode in which only one frame is shot, and a continuous shooting mode in which a plurality of frames are shot continuously.

<Exposure control mode> Silver salt film and C
CD exposure is controlled in the following four modes. A mode: Priority is given to the set aperture value, and the shutter speed is adjusted. S mode: The set shutter speed is prioritized and the aperture value is adjusted. P mode: Adjust the aperture value and shutter speed according to a predetermined program line. M mode: Uses the set aperture value and shutter speed.

<Focus control mode> Silver salt film and C
The adjustment of the image forming position in photographing with a CD, that is, the focus adjustment is performed in the following two modes. AF mode: Automatic focus adjustment. MF mode: manual focus adjustment.

<Video Playback Mode> The video signal is played back in the following modes. V mode: A recorded video signal is played back as an image.

In addition to the above, a next-generation silver halide film in which a magnetic medium is applied to record photographing information on the magnetic medium is targeted, and an E mode for editing recorded photographing information is also provided. There is. The focal length of the zoom lens is adjusted by a power zoom system in which a zoom lens group is driven by a motor.

Each constituent element of the camera will be described below with reference to FIG. 1. Members provided in the camera body C are denoted by reference symbols beginning with C, and members provided in the taking lens L are denoted by L. Numbers starting with.

On the outer surface of the fixed lens barrel L13 of the taking lens L, operating rings L01 and L03 rotating in the circumferential direction are provided. These are operated and rotated by the user. An encoder L02 for detecting rotation of the operation ring L01 is provided inside the operation ring L01, and an encoder L0 for detecting rotation of the operation ring L03 is provided inside the operation ring 03.
4 are provided. The operation ring L01 is for adjusting the focal position of the photographing lens L, and the operation ring L03 is for adjusting the focal length.

Reference numeral L05 is a focal length detector for detecting the set focal length of the taking lens L. L07 is a zoom motor for changing the focal length of the taking lens, L08
Is a zoom motor monitor that detects the rotation state of the zoom motor L07. L09 is a focus motor for adjusting the focus position, L11 is a diaphragm, L12 is a diaphragm L
Aperture controller for opening and closing 11, AF for focus adjustment by L10
It is an AF / MF changeover switch operated by the user to switch between the mode and the MF mode. Reference numeral L06 denotes an arithmetic control unit for controlling the focal length, focal position, and aperture adjustment of the photographing lens L, which is constituted by a microcomputer (hereinafter, also referred to as a lens microcomputer).

When the operation ring L01 for adjusting the focus position is operated while the AF / MF selector switch L10 is set to the MF mode side, its rotation is caused by the encoder L02.
Detected and transmitted to the calculation control unit L06. The arithmetic control unit L06 arithmetically processes the detection output of the encoder L02, and drives the focus motor L09 based on the result to perform focus adjustment. When the operation ring L03 for adjusting the focal length is operated, the rotation thereof is reflected by the encoder L0.
4 and is transmitted to the arithmetic control unit L06. The arithmetic control unit L06 arithmetically processes the output of the encoder L04 and drives the zoom motor L07 on the basis of the result to perform zoom adjustment. The arithmetic control unit L06 also applies a control signal to the diaphragm control unit L12 to control the opening / closing of the diaphragm L11 and regulates the light flux passing through the taking lens L. Information for controlling the aperture is provided from the camera body C to the arithmetic control unit L.
06.

A flash & light F can be mounted on the upper part of the camera body C. Flash & Light F
Can emit flash light and continuously emit quantitative light, and irradiate a subject for a short time or a long time. Both are used for the purpose of compensating for the insufficient light quantity of the subject, but mainly flash light is used for photographing with a silver halide film and quantitative light is used for photographing with a CCD. The light emission of the flash & light F is controlled by a built-in control unit F01.

The camera body C is provided with an arithmetic and control unit (hereinafter, also referred to as a main microcomputer) C01 composed of a microcomputer for controlling the camera body. As will be described later, the main microcomputer C01 has a non-volatile memory C40 that stores information necessary for focusing the image of the silver salt film and the image of the CCD at the same time. The main microcomputer C01 not only controls the main unit,
The lens microcomputer L06 is communicated via the communication contact C30, and the flash & light control unit F01 is communicated via the communication contact C20 to obtain information necessary for the photographing operation and to provide a control command.

Specifically, from the lens microcomputer L06,
The lens obtains fixed information specific to the taking lens L, such as the open aperture value and the longest and shortest focal lengths, and information on the current setting conditions such as an AF / MF switch, focal length, and focal position. Microcomputer L06
, Information on conditions to be set in photographing, such as an aperture value and a focus position, is provided. Flash & light control unit F
In addition to the fixed information including the maximum and minimum irradiation angles, information necessary for controlling the operation of each light emission such as completion of light emission preparation is obtained from the control unit F01. And a signal instructing start and stop of light emission.

In the camera body C, C04 is a half mirror, which splits the light passing through the taking lens L into transmitted light and reflected light, and uses a silver halide film as the first photographing section and a CCD as the first photographing section. 2 lead to the shooting department. C07 is a shutter, C06 is a drive unit of the shutter C07, C09
Is a film supply unit that supplies the silver salt film C08, and these constitute a first photographing unit.

C05 is a movable total reflection mirror provided behind the half mirror C04 (hereinafter, also referred to as a sub mirror), and reflects the light transmitted through the half mirror C04 downward. The sub-mirror C05 is operated by a mechanism (not shown) when the first imaging unit performs imaging.
The light flux from 04 to the film C08 is retracted to a position that does not block it.

Below the sub-mirror C05, there is provided a focus state detection section (hereinafter also referred to as an AF module) C02 including a line sensor. The distance from the sub mirror C05 to the AF module C02 is set to be substantially equal to the distance from the sub mirror C05 to the film C08, and the light receiving surface of the AF module C02 is on a surface substantially equivalent to the film C08. The AF module C02 detects the in-focus state in the first imaging unit.

Reference numeral C03 denotes a light receiving element which constitutes a photometric / light adjusting section for detecting the brightness of the normal subject and the brightness of the subject illuminated by the emission of the flash & light F (hereinafter also referred to as an AE sensor). The shutter C07 or the film C08 is arranged so as to detect reflected light. The outputs of the AF module C02 and the AE sensor C03 are given to the main microcomputer C01 and used for focus control and exposure control, respectively.

When the shutter release button (not shown) is operated when the shooting mode is set to the single shooting mode of PH or PM mode for shooting with a silver halide film,
The main microcomputer C01 retracts the sub-mirror C05 after the focusing control described later, and the shutter drive unit C
A control signal is given to 06 to open the shutter C07. When the time corresponding to the set shutter speed has elapsed, the main microcomputer C01 gives a control signal to the shutter drive unit C06 to close the shutter C07 and restore the sub-mirror C05. During this time, the silver salt film C08 is exposed to light by the light transmitted through the photographing lens L and the half mirror C04, and photographing is performed. After closing the shutter, the main microcomputer C01 is connected to the film supply unit C09.
To supply the silver salt film C08 for one frame to prepare for the next shooting.

In the PH or PM continuous shooting mode, the sub-mirror C05 is retracted, and then the shutter C0 is released.
The opening and closing of 7 and the feeding of the film C08 are repeated until the shutter release button is released, and then the sub mirror C05 is returned. The continuous shooting mode will be described in detail later.

A condenser lens C10 and a total reflection mirror C11 are provided above the half mirror C04. The light reflected by the half mirror C04 is thinned by the condenser lens C10, and then the mirror C1.
1 is guided to the rear side of the camera body. C13 is ND
It is a filter and is configured so that the light transmittance can be changed from total transmission to several steps. This light transmittance is set by the ND filter control unit C15.

C14 is a relay optical system having a movable lens and a diaphragm C18. The first imaging unit and the later-described second
Although the photographing areas of the photographing units are different, the photographing angle of view of both photographing units is made substantially equal by the relay optical system C14.
C19 is a control unit of the relay optical system C14, and includes a drive unit that moves the movable lens of the relay optical system and sets the diaphragm C18, and a detection unit that detects the position of the movable lens and the size of the diaphragm that is set. Become. The focus position of the relay optical system C14 is adjusted by the control unit C19 moving the movable lens along the optical axis.

C16 is an optical low pass filter, C17
Is an IR (infrared) cut filter, C21 is a CCD that is an image sensor, and C23 is a CCD that drives the image sensor C21.
The drive unit, C22 is an image pickup processing unit (hereinafter, also referred to as an A / D converter) that samples the analog output of the image pickup element C21 and further converts it into a digital signal, and C24 is an A / D converter.
An image processing unit that processes the output of the D converter C22 and converts it into an image signal, and these constitute a second imaging unit.

The ND filter C13 and the aperture C18 of the relay optical system C14 are the difference in sensitivity between the silver salt film as the image pickup device and the CCD, and the condenser lens C10 for the light guided to the second photographing section and the relay optical system. C14
This is provided to correct the increase in the amount of light per unit area due to In any case, it is possible to reduce the amount of light guided to the second imaging unit. When the light flux is regulated by the diaphragm C18 to reduce the light amount, the depth of field of the second photographing unit becomes deep. On the other hand, when the ND filter C13 absorbs and attenuates light, the depth of field of the second imaging unit is not affected. In consideration of the effect on the image due to such a difference in characteristics, the ND filter C
13 and the aperture C18 can be appropriately selected or both can be used in combination.

As a medium for recording the image of the second photographing section, a magnetic medium such as a magnetic tape or a magnetic disc, an optical medium such as a digital video disc (DVD) or a mini disc (MD), or a flash memory or the like. Various things such as a semiconductor storage medium can be used. Here, a magnetic tape C28 is used as a recording medium so that a home VTR device can easily view and view an image.

C26 is a magnetic head for writing and reading the magnetic tape C28, C36 is a drive unit for the magnetic tape C28, and C25 is a recording / reproducing unit for encoding and decoding image signals. The image signal of the image processing section C24 is recorded on the magnetic tape C28 via the magnetic head C26 by the recording / reproducing section C25, and the image signal recorded on the magnetic tape C28 is read by the magnetic head C26 and reproduced by the recording / reproducing section C25. Is done. C27 is a display unit that displays an image (hereinafter, also referred to as EVF), and is composed of a color liquid crystal display device (LCD). The display unit C27 functions as a finder monitor when the second imaging unit is performing imaging, and the display unit C27 functions as a reproduction monitor when an image on the magnetic tape C28 is being reproduced.

C31 is a voice processing unit for processing the voice collected by the microphone C34 provided at the front of the camera body. The audio signal output from the audio processing unit C31 is supplied to the recording / reproducing unit C25, and is recorded on the magnetic tape C28 together with the image signal from the image processing unit C24. C33
Is a speaker, which outputs a reproduced sound when the image on the magnetic tape C28 is reproduced. A power supply unit C29 supplies power to the camera body C, the taking lens L, and the flash & light F.

The COP is an operation unit and is composed of operation members such as buttons, levers, and switches. The user operates the members of the operation unit COP to input the setting of the shooting mode and the exposure control mode and information necessary for shooting in the set mode, for example, the shutter speed when the exposure control is the S mode. I do. The shutter release button provided on the operation unit COP outputs a signal S1ON for starting automatic focus adjustment in the first stroke, and a signal S2ON for starting shooting by the first shooting unit in a deeper second stroke. Is output. C35 is a display for displaying the status of the camera, and is composed of an LCD. The display portion C35 is
Information about the camera such as the set mode and the remaining power of the power supply unit C29 is displayed.

C32 is a connector section for connecting to an external device, and includes a main microcomputer C01 and an image processing section C2.
4, and the audio processing unit C31 is connected to another electronic device. It is possible to externally supply control information to the main microcomputer C01 through the connector section C32 to control the operation of the camera, and supply image signals and audio signals to external devices. In addition, the audio processing unit C31 can record the audio signal given from the external device on the magnetic tape C28 instead of or superimposed on the audio signal from the microphone C34. The connector C32 is also used to connect with an adjusting device when adjusting the camera after assembling.

When the main switch provided in the operation section COP is operated and power supply is started, the main microcomputer C01
Sends a control signal to the CCD drive unit C23 to cause the image sensor C
The light reception by 21 is started. This output signal is provided to an image processing unit C24 via an A / D converter C22 and is converted into an image signal. The output signal of the image processing unit C24 is supplied to the image display unit C27, and the image is displayed in color.

Light reception by the image pickup device C21 and image display portion C
The image display by 27 is always performed while the power is supplied regardless of the setting of the photographing mode. Therefore, the user must take a still image on a silver salt film or a CCD.
In shooting a moving image by, the shooting angle can be set while observing the image displayed on the image display unit C27. When the shooting mode is set to the MV or PM mode, the output signal of the image processing unit C24 is the operation unit C.
In response to a recording operation from the OP, it is also given to the recording / reproducing section C25 and recorded on the magnetic tape C28.

When the PM mode is set in which the silver salt film and the CCD are simultaneously shot, as described above, the first shutter release button is operated in response to the operation.
Photographing is performed by the photographing unit of. During this period, the recording of the moving image on the magnetic tape C28 by the second photographing unit is continued regardless of the operation of the shutter release button. Therefore,
A part of the continuous image recorded on the magnetic tape is recorded on the silver salt film as a still image.

The detection of the in-focus state of the first photographing section by the AF module C02 is performed by the phase difference detection method which is a well-known technique. For this purpose, the AF module C0
2 includes at least one pair of sensors including a line sensor and an imaging lens (not shown). Main microcomputer C
01 determines the defocus amount by comparing the distance between the two images formed on these line sensors with the reference distance at the time of perfect focusing, and determines whether the defocus amount is within the allowable range. Then, it is determined whether or not it is in focus.

The detection of the in-focus state in the second photographing section is performed by the well-known contrast detection method. That is, the movable lens of the relay optical system C14 is moved back and forth from the set position, and the image processing unit C2
The image signal from 4 is monitored, and its contrast change is detected. Full focus is achieved when the contrast is maximized. The main microcomputer C01 determines the defocus amount from the amount of change in the contrast value, and determines whether or not it is in focus depending on whether or not the defocus amount is within the allowable range.

The change in the focal position of the taking lens L affects the in-focus state of the images of the first and second photographing sections,
The change in the focus position of the relay optical system C14 affects the in-focus state of the image of the second imaging unit. Therefore, the focus adjustment for the silver salt film C08 of the first photographing unit can be performed by the photographing lens L, and the focus adjustment for the image pickup device C21 of the second photographing unit can be performed by the photographing lens L and the relay optical system C14. Focal position of taking lens L and relay optical system C
The focal positions of 14 can be set independently of each other, but in the above-mentioned camera, the focus adjustment is performed in response to a request from using the second image pickup section as a finder and an inevitable request from the shooting mode. Like.

In the PH mode in which only the silver salt film is used for photographing, the focus position of the photographing lens L is naturally adjusted.
At this time, the focus position of the relay optical system C14 is fixed to a predetermined position in order to focus the finder image. CC
In the PM mode in which shooting is performed with the silver salt film during shooting with D, it is necessary to focus the subject on both the CCD and the silver salt film at the same time, so the focus position of the shooting lens L and the relay optical system C14. The focus position is adjusted in conjunction, or the focus of the relay optical system is fixed at a predetermined position as in the PH mode, and only the taking lens L is used for adjustment.

In the MV mode in which only the CCD is used for photographing, the focus of the relay optical system is fixed at a predetermined position and adjusted only by the photographing lens L as in the PH mode, or the photographing lens L is fixed at a predetermined focal position. Relay optical system C1
Only the focus position of 4 is adjusted. The relay optical system C14 is
Since the image circle of CCD is small, the shooting lens L
Compared to the above, the configuration is simple, the driving unit is lightweight, and the power required for driving is small.

When both the image of the first photographing section and the image of the second photographing section are focused, the focal position of the photographing lens L for focusing the light from the subject on the first photographing section is It changes depending on the distance to the subject. In order for the first photographing unit to focus on the subject and the second photographing unit to focus, the focal position of the relay optical system C14 is uniquely determined to a fixed point. On the other hand, when focusing only the image of the second imaging unit, the focus position of the relay optical system C14 changes depending on the distance to the subject and the focus position of the taking lens L.

In the above-mentioned camera, the focal position of the photographing lens L is such that the image of the first photographing section is changed from the non-focused state to the focused state while at the same time the image of the second photographing section is kept in the focused state. And the focal position of the relay optical system C14 are stored in the non-volatile memory C40. When the focus position of the taking lens L is adjusted so that the image of the first image capturing unit is in focus, the image of the second image capturing unit is kept in focus from the stored positional relationship with the focus position. Relay optical system C to leave
The 14 focal positions are calculated.

The focal position of the relay optical system C14 for focusing both the image of the first photographing section and the image of the second photographing section is determined when the camera is designed according to the distance to the subject. However, considering that a slight error may occur at the time of assembling the camera, it is preferable to make an adjustment so as to correct the assembling error, rather than simply determining the relationship between the focal positions by design calculation. Therefore, the relationship between the focal position of the photographing lens L and the focal position of the relay optical system C14 that simultaneously focuses the image of the first photographing unit and the image of the second photographing unit is measured after manufacturing as follows. .

After the camera is assembled, a detecting device having an extremely high resolution is arranged at the position of the silver salt film C08, and the camera is connected to an external adjusting device via the connector C32. The shooting lens L is controlled by an external adjustment device.
With the stop L11 of the photographing lens L opened, the image of the measuring object is observed by the detecting device while changing the focal position of the photographing lens L, and the focal position of the photographing lens L forming the sharpest image of the measuring object is obtained. . Next, with the focus position of the taking lens L held at this position, the relay optical system C14
The CCD receives light while moving the movable lens. During this period, the position of the movable lens that gives the image with the highest contrast is obtained from the data output from the A / D converter C22 and stored in the memory C40.

Focus adjustment is in AF mode, shooting is PM
In the normal mode, when the focus position of the relay optical system C14 is normally changed to keep the image of the second image pickup section in focus, the image of the first image pickup section is changed from out of focus. The focus position of the taking lens L is changed while the AF module C02 detects the in-focus state of the first imaging unit until the in-focus state. At this time, at an arbitrary shooting distance for infinity of the focusing surface corresponding to the shooting lens L and the focal length f of the shooting lens L and the focal length f of the shooting lens L and the shooting lens L stored in the memory C40. The focus position of the taking lens L and the focus position of the relay optical system C14 are controlled based on the moving amount of the focusing surface, the moving amount of the movable lens, and the detection signal of the AF module C02 to bring the image of the second photographing unit into the focused state. The image of the first imaging unit is focused while keeping the same.

The initial operation of the camera at the start of power supply will be described. When the supply of electric power is started by operating the main switch, the main microcomputer C01 tries to communicate with the lens microcomputer L06 and determines whether or not the taking lens L is attached. When the taking lens L is not attached, a warning to that effect is displayed on the display section C35. When the taking lens L is attached, the following processing is performed.

Information specific to the taking lens L, that is, the type of the taking lens L, the maximum aperture value, the minimum aperture value, the maximum focal length, and the minimum focal length is acquired from the lens microcomputer L06. The type of the taking lens L and the focal length are necessary for correctly reading the relationship between the distance to the subject and the focal position of the relay optical system C14 from the memory C40. Then A
The setting status of the F / MF changeover switch L10 is obtained. A control signal for instructing initialization is given to the lens microcomputer L06 to set the taking lens L to the initial state. In response to this command, the lens microcomputer L06 responds to the zoom motor L0.
7 to set the focal length to the minimum or maximum, to drive the focus motor L09 to set the focus position to infinity or the closest end corresponding to the shortest possible shooting distance, and the aperture L11 via the aperture controller L12. Open up. The ND filter C13 is set to full transmission through the ND filter control unit C15. Relay optical system C1 via relay optical system controller C19
The movable lens of No. 4 is driven to set the focal position of the relay optical system C14 to a predetermined position, infinity, or the closest end. Relay optical system C1 via relay optical system controller C19
The diaphragm C18 of 4 is opened. The image pickup device C21 is driven via the CCD drive unit C23, and the light reception and image signal generation in the second image pickup unit are started. The settings of various operation members of the operation unit COP and the stored default values are read out and displayed on the display unit C35.

By this initial setting, preparations for recording a still image on the silver salt film by the first photographing section and recording a moving image by the second photographing section are completed. Hereinafter, the setting is changed according to the input from the operation unit COP or the setting change of the AF / MF changeover switch L10, and the image is taken by the first photographing unit, the second photographing unit, or both.

The control processing performed by the main microcomputer C01 when photographing with a silver halide film in the AF mode will be described with reference to the flowcharts of FIGS. FIG. 2 shows the flow of processing in the single-shot mode in which only one frame is shot. After the control is started, the main microcomputer C01 turns on the signal S1ON for instructing to start the focus adjustment issued by the first stroke of the shutter release button.
(Step # 5), first the AF module C02
The defocus amount of the image of the first imaging unit is detected from the output of # (# 10). Next, the detected defocus amount is compared with a predetermined value to determine whether or not it is in focus (# 15).

When the defocus amount exceeds the predetermined value, it is determined that the lens is out of focus, and the driving amount of the focus motor L09 of the photographing lens L is determined from the focal length of the photographing lens L at that time and the detected defocus amount. The focus position is calculated (# 20), the focus motor L09 is driven by the calculated amount to change the focus position of the taking lens L (# 25), and the process returns to # 10.

When it is determined in # 15 that the detected defocus amount is equal to or less than the predetermined value, it is determined to be in focus, and the signal S2O issued by the second stroke of the shutter release button is determined.
The presence or absence of N is determined (# 40). When there is no signal S2ON, the process returns to step # 5, and when there is a signal S2ON, shooting with a silver salt film is performed. That is, the sub-mirror C05 is retracted (# 45), the shutter C07 is opened, and the film C08 is exposed (# 50). AE sensor C0
When it is determined from the output of 3 that the light amount of the subject is insufficient, the flash & light F is caused to emit light during exposure, and the subject is appropriately illuminated. After the film exposure, the sub-mirror is returned (# 55), the silver salt film C08 is fed by one frame (# 60), and the process is completed in preparation for the next photographing.

FIG. 3 shows a first processing procedure in the continuous shooting mode for continuously shooting a plurality of frames. After the control is started, the in-focus state of the image of the first photographing unit is detected, the focus positions of the photographing lens L and the relay optical system C14 are adjusted, and the first
After focusing the image of the image capturing section of the camera, a signal S2 for instructing exposure
The processing of steps # 105 to # 140 until waiting for ON is the same as the processing of # 5 to # 40 in FIG. 2 described above.

When the signal S2ON is issued at # 140, the main microcomputer C01 determines that the sub-mirror C0
5 is retracted (# 145), the shutter C07 is opened, and the film C08 is exposed (# 150). During exposure,
The flash & light F is emitted as needed to compensate for the insufficient light amount of the subject. After the exposure, the film is fed by one frame (# 155), and it is determined whether or not the signal S2ON is continuously issued (# 160). When the signal S2ON is received, the process returns to # 150 and the exposure and feeding of the film are repeated. Shutter release button released and signal S2 ON
When there is no more, the submirror C05 is restored (# 16
5) Then, the shooting ends.

In the above processing, the sub-mirror C is used during continuous shooting.
05 is held in the retracted position. Therefore, the silver salt film C08 can be exposed without waiting for the movement of the sub mirror C05. The time required from the shooting of one frame to the shooting of the next frame is substantially only the time required to feed the film, and the quick-shooting property is improved. However, since focus adjustment is not performed during continuous shooting, an unclear image may be taken when the subject moves during this period.

FIG. 4 shows a second processing procedure performed by the main microcomputer C01 in the continuous shooting mode. Step # 20
The processes of 5 to # 240 are the same as those of # 5 to # 40 of FIG.
Since the processing is the same as the processing of # 105 to # 140, the description thereof will be omitted.

When the exposure start is instructed by the signal S2ON in # 240, the main microcomputer C01 retracts the sub-mirror C05 (# 245), and the shutter C07.
Is opened to expose the film C08 (# 250), and after completion of the exposure, the film is fed by one frame (# 255).
The flash & light F is appropriately emitted during the exposure. After feeding the film, it is determined whether or not the signal S2ON is present (# 260),
When there is no signal S2ON, the sub-mirror C05 is returned (# 265), and the photographing is finished.

When the signal S2ON is continuously issued, the in-focus state of the image of the second photographing section is detected (# 27
0), the detected defocus amount is compared with a predetermined value to determine whether or not it is in focus (# 275). When the defocus amount is equal to or less than the predetermined value, it is determined that the focus is achieved, the process returns to step # 250, and the exposure and the feeding of the film are repeated. When the defocus amount exceeds the predetermined value, it is determined that the lens is out of focus, and the driving amount of the focus motor L09 of the photographing lens L is calculated from the focal length of the photographing lens L at that time and the detected defocus amount (# 280). Then, the focus motor L09 is driven by the calculated amount to change the focus position of the taking lens L (# 285), and the process returns to # 260.

In the second process, the image of the first photographing section is focused and the continuous photographing is started. During the continuous photographing, the focus state is detected and the focus position is adjusted. Therefore, not only the first frame but also all the frames can be focused. On the other hand, by detecting the in-focus state and adjusting the focus, the quick-shooting property is slightly reduced as compared with the first process described above.

The detection of the in-focus state during photographing is performed not for the image of the first photographing unit but for the image of the second photographing unit. The focus state of the second imaging unit can be detected even when the sub mirror C05 is at the retracted position. In the above process, the focus state is detected while the sub-mirror C05 is retracted, and the delay of the focus state detection due to the movement of the sub-mirror C05 is avoided. Therefore, the processing is such that the deterioration of the quick-shooting property is minimized.

The camera of this embodiment is set so that the processing in the continuous shooting mode can be selected from the first and second processing procedures. As described above, each processing procedure has a different effect when the subject moves. The user can select a processing procedure suitable for the shooting conditions in consideration of the moving speed of the subject. Although the processing in the PH mode is illustrated here, the first and second processing procedures in the continuous shooting mode can also be applied when shooting on a silver salt film in the PM mode.

[0075]

When the camera of the present invention is used, in the continuous shooting mode, the focusing state of the image of the first photographing section is not detected except for the first photographing, so that the detection of the focusing state is awaited. Therefore, the second and subsequent shootings can be performed. Even when the detection of the in-focus state of the image of the first imaging unit requires a relatively long time, for example, with the retracting and returning operations of the mirror, it is possible to quickly perform the second and subsequent imaging. it can. Therefore, many images can be taken per unit time.

According to the second aspect of the present invention, all the images taken in the continuous shooting mode can be focused. By making the time required for detecting the in-focus state by the second detecting means shorter than the time required for detecting the in-focus state by the first detecting means, the in-focus state is detected by the first detecting means every time. The time interval of shooting in the continuous shooting mode is certainly shortened as compared with the case of performing.

According to the third aspect of the present invention, the existing useful technique is used for the first photographing means and the first detecting means, and the photographing in the continuous photographing mode can be performed quickly.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a camera according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a control process when shooting on a silver salt film in a single shooting mode.

FIG. 3 is a flowchart showing a first control process when shooting on a silver salt film in continuous shooting mode.

FIG. 4 is a flowchart showing a second control process when shooting on a silver halide film in continuous shooting mode.

[Explanation of symbols]

C Camera main body C01 Calculation control unit C02 Focusing state detection unit (first detection means) C03 Light receiving element C04 Half mirror (light splitting means) C05 Sub mirror C07 Shutter C08 Silver salt film (first photographing means) C09 Film supply section C10 Condenser lens C13 ND filter C14 Relay optical system (second optical system) C18 Relay diaphragm C19 Relay optical system control unit C21 CCD (Second photographing means, second detection means) C22 Imaging processing unit C23 CCD driving unit C24 Image processing unit C25 Recording / playback unit C27 Image display unit C28 Magnetic tape C31 Audio processing unit C40 Non-volatile memory COP operation unit L Photographic lens (first optical system) L05 Focal length detection unit L06 Calculation control unit L07 Zoom motor L09 Focus motor L1 1 Aperture F Flash & Light

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display area H04N 5/232 G03B 3/00 A

Claims (3)

[Claims] 1. A light splitting means for splitting light from a subject to be photographed into first light and second light, and first photographing means for receiving the first light and photographing an image of the light. A second photographing means for receiving the second light and photographing an image of the light; and a first photographing means capable of adjusting a focus position and guiding the light from the photographing object to the light splitting means.
And an optical system for guiding the second light from the light splitting means to the second photographing means, and an in-focus state of an image of the first light in the first photographing means. First to detect
A detecting means for detecting the in-focus state of the image of the first light by the first detecting means, and adjusting the focus position of the first optical system according to the detected in-focus state. Then, the first photographing means performs the first photographing, and the first detecting means performs the first photographing.
A continuous shooting mode for performing the second and subsequent shootings by the first shooting means without detecting the in-focus state of the light image. 2. A second detection means for detecting a focus state of an image of the second light in the second photographing means, wherein the second detection means detects the second state in the continuous shooting mode. The in-focus state of the image of the light is detected, the focus position of the first optical system is adjusted according to the detected in-focus state, and the second and subsequent photographing operations are performed by the first photographing means. The camera according to claim 1. 3. The first photographing means performs photographing by exposing a silver salt film to light, and the first detecting means detects a gap between a position on the optical path of the first light and a position outside the optical path. A movable mirror, and detects the in-focus state of the image of the first light in the first photographing means by the light reflected by the mirror. 3. The mirror is held at a position outside the optical path of the first light after detecting the focused state of the light image.
The camera according to.