JPH06308567A - Camera provided with depth confirming function - Google Patents

Abstract

PURPOSE:To make it possible to confirm an image having a depth which is close to that of an actually finished photograph by performing the diaphragming of a lens based on a diaphragm value corresponding to the kind of a loaded focusing screen. CONSTITUTION:The camera is provided with a diaphragm controlling means for correcting the diaphragm value which is obtained from diaphragm setting means 1 and 2 and for outputting the value to a depth confirming means 1 as the set diaphragm value when a control member for depth confirmation SW6 is operated. Also, the camera is provided with a detecting means for detecting the kind of the loaded focusing screen, and also a correction value varying means for varying the value for correcting the diaphragm value which is obtained from the diaphragm setting means 1 and 2 in accordance with the kind of the focusing screen detected by the detecting means. In the case of performing the diaphragming of the lens by the depth confirming means 1, the diaphragming of the lens is performed based on the value which is obtained by correcting the diaphragm value used for exposure, so that the image which is close to that of the actually finished photograph is confirmed in a finder in advance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera with a depth confirmation function which has a function of confirming the depth at the time of exposure.

[0002]

2. Description of the Related Art Conventionally, the lens is narrowed down by the same amount as that at the time of exposure (the aperture value at this time is the value set by the aperture setting means or the value calculated from the photometric value). , A camera capable of confirming the depth at the time of exposure in advance has been proposed.

[0003]

However, in recent years,
In single-lens reflex cameras, the use of AF (autofocus) has progressed, and the amount of light flux that reaches the viewfinder is reduced by the amount of light that is split into the AF optical system. Therefore, the focussing screen is more transparent and bright. However, when the aperture is narrowed down by the depth confirmation means by the same amount as during exposure, there is a disadvantage that the image that can be confirmed by the finder is confirmed to be shallower than the actual finish.

Further, when the soft focus lens is attached, the blur is confirmed to be less than the actual blur.

(Object of the Invention) A first object of the present invention is to provide a camera with a depth confirmation function capable of confirming an image having a depth close to the finish of an actual photograph.

A second object of the present invention is to provide a camera with a depth confirmation function capable of confirming an image having a depth close to that of an actual photograph and a soft focus blur.

[0007]

According to the present invention, when the operation member for depth confirmation is operated, the aperture value obtained by the aperture setting means is corrected and the depth confirmation is performed with this value as the set aperture value. A diaphragm control means for outputting to the means and a detection means for detecting the type of the focusing screen to be mounted are provided, and the diaphragm control means is provided with a diaphragm according to the type of the focusing screen detected by the detection means. The correction value varying means for varying the value for correcting the aperture value obtained by the setting means is provided, and when confirming the depth, the aperture value is different from the aperture value at the time of exposure, that is, the aperture value according to the type of the focusing screen to be mounted. I try to narrow down the lens.

Further, a detection means for detecting the type of the focusing screen to be mounted and a judgment means for judging whether or not the soft focus lens is mounted are provided, and the detection by the detection means is provided in the aperture control means. Depending on the result and the discrimination result by the discriminating means, correction value varying means for varying the value for compensating the aperture value obtained by the aperture setting means is provided, and the depth is different from the amount to be narrowed down during exposure, that is, The lens is narrowed down according to the aperture value according to the type of focusing screen to be attached and whether the soft focus lens is attached.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on the illustrated embodiments.

FIG. 1 is a block diagram showing a main configuration of a camera with a depth confirmation function according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 is a microcomputer for controlling the movement of each part of the camera.

Reference numeral 2 denotes a lens control circuit, which is a focus adjusting motor for the taking lens (not shown) and a diaphragm blade controlling motor 11
Drive control. The lens control circuit 2 performs serial communication via the data bus DBUS while receiving the LCOM signal from the microcomputer 1, receives motor drive information by this serial communication, and controls the drive of the motor based on the information. Also, it receives the narrowing down amount by serial communication and narrows down the narrowing down amount by that amount. At the same time, various information (focal length, etc.) of the lens is sent to the microcomputer 1 by serial communication.

Reference numeral 3 denotes a liquid crystal display circuit, which is a circuit for driving a liquid crystal display (not shown) for notifying the photographer of various photographing information of the camera, for example, shutter speed, aperture value, ISO sensitivity, number of films and the like. is there. The liquid crystal display circuit 3 performs serial communication via the data bus DBUS while receiving the DPCOM signal from the microcomputer 1, receives display data by this serial communication, and drives the liquid crystal display according to the data.

Reference numeral 4 denotes a switch sense circuit, which reads the state of a switch for the photographer to set each photographing condition and the state of the camera, and the microcomputer 1
It is a circuit to send to. Then, while receiving the SWCOM signal from the microcomputer 1, the data bus DBUS
The microcomputer 1 by serial communication via the
Send switch data to. The switch sense circuit 4 detects which type of focusing screen is attached and which soft focus lens is attached.

Reference numeral 5 denotes a strobe light emission dimming control circuit, which controls a strobe light emission and a light emission stop function by TTL dimming. This strobe light emission control circuit 5 is
While receiving the RCOM signal, serial communication is performed with the microcomputer 1 via the data bus DBUS, and data relating to strobe control is received to perform various controls.

Reference numeral 6 denotes a focus detection circuit in which a line sensor for performing AF by the existing phase difference detection method and a circuit for storing and reading the line sensor are unitized.
AF control is performed according to an instruction from the microcomputer 1.

Reference numeral 7 denotes a photometric circuit, which performs photometry of an object and sends a photometric output to the microcomputer 1 under the control of the microcomputer 1. The microcomputer 1 which receives this converts the sent photometric output from A / D and uses it for setting exposure conditions (aperture, shutter speed).

Reference numeral 8 denotes a shutter control circuit, which controls traveling of a front curtain and a rear curtain of a shutter (not shown) according to a control signal from the microcomputer 1.

Reference numeral 9 is a feeding circuit, which feeds (winds up, winds, or feeds the film in accordance with a control signal from the microcomputer 1.
Rewind).

SW1 is a switch for starting the photographing preparation operation of the camera. When the microcomputer 1 recognizes that the switch SW1 is turned on, it starts photometry, distance measurement and display.

SW2 is a switch for starting the photographing operation of the camera, and when the microcomputer 1 recognizes that the switch SW2 is turned on, the exposure operation is started.

The X contact is turned on at the timing when the front curtain of the shutter is completely driven, and serves to inform the strobe light emission control circuit 5 of the strobe light emission timing.

SW3 is a screen detection switch, SW4 is a switch for switching camera modes (Tv priority, Av priority, manual, program, etc.), SW5 is a screen detection switch, and SW6.
Is a depth confirmation switch.

Reference numeral 10 is an electronic dial for changing the Tv value, Av value mode and the like. When the electronic dial 10 is rotated while the mode switching switch SW4 is ON, Tv priority → Av priority → manual → Program → T
It is changed to v priority → Av priority → manual → program ... and can be set to the mode intended by the photographer. Also, when the electronic dial 10 is rotated in the reverse direction, the program → manual → Av priority → Tv priority → program →
... and the mode is changed. Further, when Tv priority is set as a mode by the mode switching switch SW4 and the electronic dial 10, the electronic dial 10 is rotated to set the Tv desired by the photographer.
You can set the value. When Av priority is set as the mode by the switch SW4 for mode switching and the electronic dial 10, the Av value desired by the photographer can be set by rotating the electronic dial 10. .

Here, it is assumed that the camera of this embodiment can be equipped with, for example, two types of focusing screens A and B (hereinafter simply referred to as screens in the description of the embodiments).

Next, a method of determining which of the two types of screens A and B is attached to the camera will be described with reference to FIG.

When the screen A (401) is attached to the camera, the screen detection switch 402 indicating that the screen A is attached is turned on, and the screen detection indicating that the screen B is attached is detected. Switch 403 is off. Also, screen B
When (404) is attached to the camera, conversely to the above, the screen detection switch 402 indicating that the screen A is attached is OFF and indicates that the screen B is attached. The screen detection switch 403 is turned on.

The screen detection switches 402, 4
O of 03 (corresponding to the switches SW3 and SW4 in FIG. 1)
N and OFF are read by the switch sense circuit 4, and the microcomputer 1 determines which screen is attached.

Next, the operation of the portion according to the present invention will be described with reference to the flowchart of FIG. [Step 201] It is determined whether or not the depth confirmation switch SW6 is turned on, and the depth confirmation switch S
If W6 is turned on, the process proceeds to step 203 to perform the narrowing operation. If the depth confirmation switch SW6 is not turned on, the process proceeds to step 202 to open the aperture. [Step 202] Since the depth confirmation switch SW6 is not turned on, the aperture is opened. That is, when the aperture is not open, the aperture is driven to open.

When the depth confirmation switch SW6 is turned on, as described above, the operation is shifted to step 203 in order to stop the aperture and proceed to the depth confirmation state. [Step 203] Here, whether the screen A or B is attached to the camera is determined as described with reference to FIG. As a result, if the screen A is attached, the process proceeds to step 204, and if the screen B is attached, the process proceeds to step 205. [Step 204] Since the screen A is mounted, the calculation of the amount of narrowing down in consideration of the correction value α suitable for the screen A (“shooting Av value−lens open Av value ±)
α ”).

The correction value α is previously stored in the ROM in the microcomputer 1. [Step 205] Since the screen B is mounted, the calculation of the amount of narrowing taking into account the correction value β for the screen B (“shooting Av value−lens open Av value ±)
β ”).

The correction value β is also stored in the ROM in the microcomputer 1 in advance. [Step 206] Since the amount of narrowing down corresponding to the mounting screen is calculated in step 204 or 205, the calculated amount is communicated to the lens to the control circuit 2 to narrow down the lens.

As described above, since the depth is narrowed down for each screen by the amount that expresses the actual depth, accurate depth confirmation can be performed. Further, even if the set Av value or the calculated Av value is the lens open value, it is possible to confirm the actual depth.

(Second Embodiment) FIG. 4 is a flow chart showing the operation of a portion according to the present invention of a camera with a depth confirmation function in the second embodiment of the present invention. The circuit configuration is the same as that of the first embodiment, and will be omitted here.

In this example, when the soft focus lens is attached, the depth confirmation means is used to accurately confirm the softness of the soft focus lens with respect to the set aperture value. [Step 301] It is determined whether the depth confirmation switch SW6 is turned on, and the depth confirmation switch SW6 is turned on.
If No. 6 is turned on, the process proceeds to step 303 to proceed with the narrowing operation. If the depth confirmation switch SW6 is not turned on, the process proceeds to step 302 for opening the aperture. [Step 302] Since the depth confirmation switch SW6 is not turned on, the aperture is opened. That is, when the aperture is not open, the aperture is driven to open.

If the depth confirmation switch SW6 is turned on, as described above, step 3 is executed to proceed to the diaphragm operation.
03 The operation shifts. [Step 303] Since the depth confirmation switch SW6 is turned on, it is determined whether or not the soft focus lens is attached when the aperture is stopped to bring the depth confirmation state. As a result, when the soft focus lens is attached, the setting routine of the narrowing down amount that can accurately express the soft taste, that is, step 307.
If the soft focus lens is not attached, the routine goes to step 30 for setting the aperture amount that can express the accurate depth when the normal lens is attached, that is, step 30.
Proceed to 7. [Step 304] Here, it is determined which of the screens A and B is attached to the camera as described in FIG. As a result, if the screen A is attached, the process proceeds to step 305, and if the screen B is attached, the process proceeds to step 306. [Step 305] Here, a lens other than the soft focus lens is mounted, and the screen A
Is attached, the calculation of the amount of narrowing down is performed by adding the correction value α that can accurately express the depth on the screen A (“shooting Av value−lens open Av value ± α”). [Step 306] Here, a lens other than the soft focus lens is attached, and the screen B
Is mounted, the calculation of the amount of narrowing is performed by adding the correction value β that can accurately express the depth on the screen B (“shooting Av value−lens open Av value ± β”). [Step 307] Similar to step 304, it is determined which of the screens A and B is attached to the camera. As a result, if the screen A is attached, the process proceeds to step 308, and if the screen B is attached, the process proceeds to step 309. [Step 308] Here, since the soft focus lens is mounted and the screen A is mounted, the correction value α ′ that can express the accurate soft taste at the set aperture value is added to the screen A. Calculation of the amount of aperture (“shooting Av value−lens open Av value ±
α '").

The correction value α'is stored in advance in the ROM in the microcomputer 1. [Step 309] Here, since the soft focus lens is mounted and the screen B is mounted, the narrowing down is performed with the correction value β that can express the correct soft taste at the set aperture value on the screen B. Calculation of amount (“shooting Av value-lens open Av value ±
β ')).

The correction value β'is also stored in the ROM in the microcomputer 1 in advance. [Step 310] Above Steps 305, 306, 3
Since the amount of narrowing down corresponding to the lens and the screen is calculated in 08 and 309, the calculated amount is communicated to the lens control circuit 2 to narrow down the lens.

When a lens other than the soft focus lens is attached, the depth is narrowed down for each screen by an amount representing the actual depth, so that accurate depth confirmation can be performed.

When the soft focus lens is attached,
Since each screen is narrowed down by the amount that expresses the accurate soft taste, it is possible to check the exact blur.

The confirmation of the soft focus lens attachment in step 303 may be performed by lens communication.
Alternatively, the switch sense circuit 4 may be used.

According to each of the above-described embodiments, when the lens is narrowed down by the depth confirmation means (microcomputer 1), it is arranged to narrow down the aperture value used for exposure by correcting the actual lens size. An image close to the finish can be confirmed in advance in the viewfinder.

Further, even if there is a difference in depth due to the focusing screen, the type of the attached screen is detected and the correction value corresponding to this is added, so it is determined which screen is attached. Also, it is possible to obtain the same effect as the above.

When a soft focus lens is attached, a correction value corresponding to this is further added by this detection, so that the soft focus lens It is possible to confirm the bokeh more accurately.

[0045]

As described above, according to the present invention,
When the operation member for confirming the depth is operated, the aperture value obtained by the aperture setting means is corrected, and the aperture control means for outputting this value as the set aperture value to the depth confirming means is provided. A detection unit for detecting the type of the focusing screen is provided, and a value for correcting the aperture value obtained by the aperture setting unit is provided in the aperture control unit according to the type of the focusing screen detected by the detection unit. A variable correction value varying means is provided, and when confirming the depth, the lens is narrowed down by an aperture value different from the amount of narrowing down during exposure, that is, the aperture value according to the type of the focusing screen to be mounted.

Therefore, it is possible to confirm an image having a depth close to the finish of an actual photograph.

Further, a detection means for detecting the type of the focusing screen to be mounted and a discrimination means for discriminating whether or not the soft focus lens is mounted are provided, and the detection by the detection means is provided in the aperture control means. Depending on the result and the discrimination result by the discriminating means, correction value varying means for varying the value for compensating the aperture value obtained by the aperture setting means is provided, and the depth is different from the amount to be narrowed down during exposure, that is, The lens is narrowed down according to the aperture value according to the type of focusing screen to be attached and whether the soft focus lens is attached.

Therefore, it is possible to confirm an image having a depth close to that of an actual photograph and a soft focus blur.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main configuration of a camera with a depth confirmation function according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the detection of the type of screen to be mounted in the first embodiment of the present invention.

FIG. 3 is a flowchart showing an operation of a main part of the camera shown in FIG.

FIG. 4 is a flowchart showing an operation of a main part of the camera with a depth confirmation function according to the first embodiment of the present invention.

[Explanation of symbols]

 1 Microcomputer 2 Lens Control Circuit 4 Switch Sense Circuit SW6 Depth Confirmation Switch 402, 403 Screen Detection Switch A, B Screen

Claims (3)

[Claims] 1. An aperture setting means for setting an aperture value, an operation member for confirming a depth, and a depth confirmation for confirming the depth by operating the operation member to narrow down the aperture of the lens based on the set aperture value. In the camera with a depth confirmation function including means, when the operation member is operated, the aperture value obtained by the aperture setting means is corrected, and this value is output to the depth confirmation means as a set aperture value. A camera with a depth confirmation function, which is provided with an iris control unit. 2. A detection means for detecting the type of the focusing screen to be mounted is provided, and an aperture control means is provided in the aperture control means according to the type of the focusing screen detected by the detection means. The camera with a depth confirmation function according to claim 1, further comprising a correction value changing means for changing a value for correcting the value. 3. A detection means for detecting the type of a focusing screen to be mounted and a judgment means for judging whether or not a soft focus lens is mounted, and the detection by the detection means in the aperture control means. 2. The camera with a depth confirmation function according to claim 1, further comprising correction value varying means for varying a value for correcting the aperture value obtained by the aperture setting means according to the result and the determination result by the determining means. .