JPS6391644A - Camera with diaphragm display device - Google Patents

Abstract

PURPOSE:To enable even a beginner to easily take a picture which is securely in focus by automatically calculating a diaphragm value for putting a different subject in focus in the operation of an operating member. CONSTITUTION:This camera is equipped with a lens driving circuit and a 1st diaphragm calculating circuit which finds a diaphragm value or placing each subject within depth when the operating member is operated on the basis of the quantity of defocusing between subjects. Further, a control circuit finds the current quantity of defocusing of a subject by operating a focus detecting circuit repeatedly when the opening member is not in operation, a 2nd diaphragm calculating circuit finds a diaphragm value for putting the current subject in focus on the basis of the quantity of defocusing of the current subject, and a display circuit displays the relation between the diaphragm value calculated by the 1st diaphragm calculating circuit and the diaphragm value calculated by the 2nd diaphragm calculating circuit. For example, the diaphragm value and diaphragm value at the time of the operating the operating member are displayed on a display device DISP2.

Description

[Detailed Description of the Invention] <Prior Art> Conventionally, as a method of photographing a plurality of subjects at different positions with each subject in focus, the camera is set in an aperture state, and the state of each subject is While checking the depth of field, I determined the aperture that would cover each subject.

For this reason, photography under the above conditions is influenced by the photographer's experience, is not suitable for amateurs, and has a high probability of failure.

Purpose of the Invention The present invention was made in view of the above-mentioned matters, and it moves the lens to a position that internally divides the amount of defocus between each subject when operating the operating member, and adjusts the operating member based on the amount of defocus. In addition to calculating the aperture value that allows each subject to be within the depth of field when operated, the above-mentioned problem is solved, and an indicator is provided to display the aperture value, and when the operating member is in a non-operating state. By repeatedly determining the defocus amount for the subject, determining the aperture value at which the current subject is in focus from this defocus amount, and displaying the aperture value on the display unit as well. It is also designed to display whether or not the current subject is in focus with the subject at the time of operation of the operating member.

<Example> Before explaining the present invention in detail, the principle of the present invention will be explained.

When considering objects A and B in two different positions,
In order to bring both wave objects into focus, the lens is first focused at approximately the center of both wave objects, that is, at a position where the defocus amounts for both wave objects match. In this state, subject A.

Since the amount of defocus of B is approximately the same, if the aperture at this time is set so that it is within the depth of field for both wave objects, both wave objects A and B will be in focus. .

Further, since the depth of field is determined by dividing the amount of defocus from the focal plane by the circle of least confusion, the aperture value at this time is determined.

In the present invention, the above aperture value is determined by determining the defocus amount for subjects A and B so that the defocus for both wave objects coincides with each other using an autofocus device, and dividing this by the circle of least confusion. The aim is to obtain a state in which both waves are in focus.

Next, examples of the present invention will be described.

FIG. 1 is a circuit diagram showing an embodiment of a camera having a display device according to the present invention.

In the figure, SPC is the photodetector for TTL open photometry, DI
is a diode, AMPI is an operational amplifier, and is a well-known photometric circuit, which outputs BVO of Apex as its output. V
RI is a variable resistor for setting film sensitivity and is Apex's SO.
Send out. VH2 is the maximum aperture value of the attached lens (
The outputs of these variable resistors VRI and VR2 as well as the output of the photometry circuit are input to the amplifier ADDI that constitutes an adder,
From DDI, BVO1SV+AVO=BV+5V=EV
Send out.

ADl is the output of the above amplifier ADDI (EV of Apex)
), and its output is input to the PE port of a microcomputer (hereinafter referred to as microcomputer).

AD2 is an AD conversion circuit that performs AD conversion on the output of the variable resistor VR2 and transmits it to the PE port of the microcomputer UCOM.

VH3 is a variable resistor that sets the minimum aperture value (minimum aperture value on the aperture side) AVL of the attached lens, and the resistor VR
The output of No. 3 transmits AVL as a digital value to the PG port of the microcomputer UCOM via the AD conversion circuit AD3.

SWMD is a mode setting operation member for setting information on the camera's shooting mode (shutter priority, aperture priority, program), and transmits mode information according to the setting mode to the PA port of the microcomputer UCOM. 5WTV is a shutter time setting member that sets shutter time information, 5WA
V is an aperture setting member for setting aperture value information, and the TV and AV values set by these members are input to the PC and PE ports of the microcomputer UCOM.

DAI is D for converting the control aperture value information sent from the PH board of the microcomputer UCOM into analog (voltage).
In the A conversion circuit, the output from the circuit DAI is input to the amplifier AMP2 constituting the subtraction circuit, and the amplifier AMP2 performs an operation with the AVO set in the resistor VR2. ΔAV) is calculated.

DRAV has a start magnet MG1 and a stop magnet MG2 for aperture control, and the above amplifier AM
This is an aperture control circuit that controls the aperture based on AV to the output of P2. EXP A N D E R is microcomputer U
Expands the control shutter second time information TV output from the PJ port of COM and transmits it to the shutter control circuit DRTV,
This is a real time expansion circuit for controlling shutter time. The shutter control circuit includes a front curtain magnet M.
It has a magnet G3 and a trailing curtain magnet MG4, and by operating each magnet, the front curtain and rear curtain (not shown) of the shutter are moved.

The above control circuits DRAV and DRTV are microcomputer U CO
It is activated by a signal from the PI port of M and starts controlling the aperture and shutter.

displ is a display device that digitally displays the shutter time value and aperture value output from the PK port of the microcomputer UCOM on, for example, a 7-segment liquid crystal display.
The aperture display value blinks based on the signal from the port.

disp2 is the array display shown in FIG. In the array display, CPI to CP24 are microcomputer UCO.
Depth information disp (K
) is a comparator array that selectively generates an output based on the LDA is comparator CPI-CP24
This is a display driver array that selectively lights up the LEDs DI to D24 by the output of the LED. The LEDD1
~D24 indicates the scale 5CALE arranged on the display board and attached with the FNo of the aperture, and displays the aperture value according to the depth information.

SWI is a switch that is turned on when the shutter button (not shown) is in the first operation state, SW2 is a switch that is turned on when the button is in the second operation state, and SW dep is a switch that is turned on when the first operation button (not shown) is pressed. A switch that is turned on at 5
WCLK is a switch that is turned on by pressing a second operation button (not shown), and these switches are input to the PD port of the microcomputer UCOM.

The DRI is a motor driver that is connected to the PN port of the microcomputer UCOM and operates the motor MTI in response to a signal from the port to drive the shutter charge and film winding mechanism.

5WCHG is a detection switch that is linked to the above mechanism and is turned on when the mechanical charge is completed and turned off when the shutter movement is completed, and this switch is connected to the PM port of the microcomputer UCOM. AFS is a focus detection circuit that calculates the amount of defocus until focusing based on a signal from an autofocus sensor that receives a light flux image incident through the photographic lens L1, and the output of this circuit is output from P of the microcomputer UCOM.
It is transmitted to the P port.

Each of the circuit elements described above is provided on the camera side, and the elements described later are provided on the lens side attached to the camera, so that information communication is performed between the camera and the lens.

On the lens side, a zoom information forming circuit is provided, which consists of a zoom brush ZMBI and a code pattern plate C0DI, and forms a digital value according to the lens zoom position 1.
The zoom information from the circuit is the zoom encoder ZOOM.
After being converted, it is transmitted to the PQ port of the camera side microcomputer UCOM via the communication controller 〇〇NC0M.

CNT is an up-down counter in which the lens drive amount information input from the PQ port of the microcomputer UCOM via the communication controller C0NC0M is set, and CONMT is the lens drive direction (positive The motor control circuit determines the direction (or reverse direction), and the circuit transmits the direction signal to the counter CNT to determine the up or down mode of the counter. DR2 is a motor drive circuit that drives the motor MT2 in a direction determined by the motor control circuits CON to IT, and the lens Ll is moved in the optical axis direction by a mechanism that is linked to the motor MT2. LPI is a comb-like pattern that moves in conjunction with the movement of the lens L1, and this pattern turns on and off the contact piece LP2 as it moves, and the contact piece LP2
A pulse is sent out every time the lens moves unit length.

Next, the operation of the embodiment shown in FIG. 1 will be explained based on the program flowcharts shown in FIGS. 3 and 4.

The program is run on the RO built in the microcomputer UCOM.
M, and each number indicates a program step.

First, when a power source (not shown) is turned on and power is supplied to the microcomputer U COM, a power-up clear is performed in step 1, and thereafter operations are performed in the following order of steps.

Step 2: Signals for turning off the display circuits displ and disp2 are sent from the PK and PL ports of the microcomputer UCOM, and the display circuits displ and disp2 are turned off.

Step 3: Switch S to the memory inside the microcomputer.
Zero is set as the number of presses information n of W d e p, and the aperture value A V d e in depth priority, which will be described later.
Set zero as p. In step 3, the number n of presses of the switch SW dep and the aperture value AVdep in depth priority are initialized.

Step 4: The state of switches SWI and SW2 is detected at the P■ port of the microcomputer UCOM, and if the detection result is that switch SWI or SW2 is on, step 5
If SWI and SW2 are off, proceed to step 12.
Proceed to.

Now, the shutter button is operated and the switch SWI or S
Assuming that W2 is on, step 5 is executed.

In step 5, the distance measurement subroutine of steps 67 to 69 is called, and the distance measurement subroutine is executed.

In the distance measurement subroutine, steps starting from step 67 are executed.

Step 68: Drive the focus detection circuit AFD and
The defocus amount Xnow determined by the focus detection circuit AFD based on the image incident on the sensor AFS via the PP port of the microcomputer UCOM is input.

Also, zoom information from the zoom information forming circuit is input to the PQ port of the microcomputer UCOM via the controllers C0NC and OM.

Step 69: End the ranging subroutine and return to the main routine. Therefore, the process moves to step 6.

Step 6: Find the lens drive JJiMV from the defocus amount Xnow found in the distance measurement subroutine. Note that the lens drive amount MV is determined based on the defocus amount Xnow and zoom information.

Step 7: Read the lens drive routine of steps 70-72. As a result, steps 70-72 are executed.

Step 71: Send lens drive amount signal MV from PQ port of microcomputer UCOM to communication controller C0NC
The lens drive amount signal MY is transmitted to the pulse counter CNT via 0M. At this time, a signal representing the drive direction is also sent from the PQ port together with the drive amount signal MV, and the motor control circuit CONMT determines forward/reverse rotation of the motor based on this signal.

Further, the up or down mode for the counter CNT is determined by this signal. Also, the motor control circuit CONM
T transmits a drive signal to the motor drive circuit DR2, and the motor MT2 rotates in the direction determined by the above drive direction signal to move the lens L1 in the optical axis direction. This movement in the optical axis direction is converted into pulses by the comb-like pattern linked to the lens L1 and the contact piece LP2, and the counter CNT
is transmitted, a counting operation is performed, and when the count value matches the set lens drive amount Mv, the counter C
A coincidence signal is sent from NT, and the motor control circuit CONMT stops driving the motor MT2 by the motor drive circuit DR2. With the above operation, the lens is driven by the above drive amount MV and brought into focus.

Further, the coincidence signal is transmitted to the microcomputer UCOM via the communication controller C0NC0M, and the process returns to the main routine at step 72, where step 8 is executed.

Step 8 calls the photometry routine of steps 64-66, and steps 64-66 are executed.

In steps 64 to 66, the output of the AD conversion circuit ADI,
That is, the EV value is input from the PE port of the microcomputer UCOM, and the process moves to the main routine, ie, step 9.

In step 9, the calculation display 1 routine of steps 44-56 is called, and steps 44-56 are executed.

Step 45: It is determined whether the number n of presses of the switch SW dep is n≧2. Now switch SW
If d e p has not been pressed even once, n=o, so the step moves to 48.

Step 48: Read the mode information to the PA port of the microcomputer UCOM, and if the mode set with the mode setting operation member SWMD is aperture priority, step 47
If the shutter priority is selected, step 50 is executed, and if the program mode is selected, step 49 is executed.

In step 47, the AV value (A
VSET) is read, and in step 51, the EV value obtained in the photometry routine and the AVSET value are calculated EV-A
VSET=TV is made. Also, in step 49, A according to the program diagram built in the microcomputer UCOM.
Based on the V value table, an AV value that uniquely corresponds to the EV value obtained in the photometry routine is selected, and in step 51, the selected AV value and the EV value are calculated to obtain the TV value. It will be done.

Further, in step 50, the TV value (TVSET) set in the shutter time setting member 5WTV input to the PC port of the microcomputer UCOM is read, and in step 52, the calculation EV- is performed with the EV value obtained in the photometry routine. TVS
ET=AV is made.

The TV and AV values for control according to the shooting mode set in steps 48 to 52 above are obtained, and in step 53, these TV and AV values are transmitted from the PK port of the UCOM to the display device displ for control. The shutter speed and aperture value for the camera are displayed. Also, in step 54, the control AV value is transferred to the DA via the PH port of the microcomputer UCOM.
The voltage is transmitted to the conversion circuit DAI, and a voltage corresponding to the AV value is output. Furthermore, in step 55, the control TV value is sent to the real time expansion circuit EX via the PJ port of the microcomputer UCOM.
The information is transmitted to PANDER, and in step 56 the process returns to the main routine, ie, step 10.

Step 10: The state of the switch SW2 at the PD port of the microcomputer U COM is detected, and when the switch SW2 is on, the process moves to step 11, and when it is off, the process moves to step 3.

As a result of the above, the shutter button is in the first operation state,
If SW1 is on and SW2 is off, follow steps 3 to 1 above.
0 is repeatedly executed, and the lens always moves to the in-focus position based on the distance measurement results, and the shutter speed and aperture value in the selected mode are displayed.

During the above process, when the shutter button is moved to the second operation state, this is detected in step 10, and step 1
1 is executed and the sequence routine of steps 57 to 63 is called.

In this routine, in step 58, a signal is sent from the PI port of the microcomputer UCOM, and the aperture control circuit DRAV is activated. The aperture control circuit DRAV is a magnet MCI.
is activated to drive an aperture regulating member (not shown), and when the aperture regulating member has narrowed the aperture by the output ΔAV of the amplifier AMP2, the magnet MG2 is activated to stop driving the aperture regulating member.

As mentioned above (the DA conversion circuit DAI outputs a voltage corresponding to the control aperture value AV, and this is transmitted to the amplifier AMP2, the output of the amplifier AMP2 changes to the ΔAV value corresponding to the control aperture value AV). The aperture becomes the control AV value in the above operation.

Also, after this, the magnet M of the shutter control circuit DRTV
G3 is activated and the shutter front curtain starts running, and as the front curtain is running, the real time expansion circuit EXPANDER is activated and a time measurement operation is started. The control TV value is inputted to the circuit EXPANDER as described above, and the circuit generates an output after measuring the time when the TV value is expanded, and operates the magnet MG4 to cause the shutter trailing curtain to run. The aperture and shutter speed are controlled in the above manner. Further, in step 59, the state of the switch 5WCHG is detected, and the switch 5WCHG is turned off, allowing a transition to step 60.

Since the switch 5WCHG is configured to be turned off when the shutter trailing curtain completes travel, the process moves to step 60 after the exposure operation is completed. In step 60, a drive signal is sent from the PN port of the microcomputer UCOM. This causes the drive circuit DRI to operate, and the motor MTI to drive the mechanical charging mechanism to perform shutter charging, aperture charging, and film feeding operations. When the charging operation is completed, the switch 5WCHG is turned on, so
The completion of the charging operation is detected in step 61, and when the charging operation is completed, the microcomputer UC is detected in step 62.
Send a stop signal from the PN port of OM, and drive circuit DR
I becomes inactive, driving of the motor MTI is stopped, and the process returns to the main routine in step 63. Above step 1
In steps 1 to 11, a series of normal camera operations are controlled.

Next, the operation when the switch SW dep is pressed will be described.

If the shutter button is not operated after the power to the camera is turned on, the process proceeds from step 4 to step 12, and the steps after step 12 are executed.

Step 12: The state of the switch S W de p is read by the PV port of the microcomputer UCOM, and when the switch S W de p is on, the process moves to Step 13.

Now, suppose that the first operation button is pressed while the distance measurement field of view is aligned with the subject A in Fig. 5, then the switch S W d
Since e p is turned on, steps 13 to 15 are executed. These steps 13 to 15 are the steps 5 to 15 described above.
7, and the lens moves to the in-focus position based on the distance measurement result.

Step 16: Set the number n of presses of the switch SW de p to 1, and set the current depth information disp (0) and the depth information disp (0) at the subject distance obtained by pressing the switch SW de p for the first time. 1) Set to 0.

Step 17: Call the display 2 routine of steps 73-75 and execute steps 73-75.

In steps 73 to 75, the current depth information disp (0
) and the depth information corresponding to the depth information disp (n) at the time of each press of the switch 5Wdisp.
It is displayed on p2.

n = 1 in step 16, and disp
Since disp (0) and disp (1) are set to 0, disp (n) becomes disp (1) and disp
p (0), disp (1) =O is displayed.

This information disp (0) and disp (1) are transmitted to the display device disp2 via the PL port of the microcomputer UCOM.

The display device disp2 is configured as shown in FIG. 2, and receives information disp(0
), disp (1) =O is detected by the comparator array, and based on the detection result (selects the driver and lights up the corresponding dot; current information disp (0) and d
Since isp (1) is O, comparator CP1
2 generates a detection output and corresponds to the scale Fl.
Turn on 12.

When this display 2 routine ends, the process moves to step 18.

Step 18: In this step the switch S W d
e p is detected again and the switch SW de
When p is off, the process moves to step 19, and when p is on, the process moves to step 27.

Now, it is assumed that the switch S W de p is held in the off state after the switch S W de p is turned on for the first time.

In this state, the above-described photometry routine is executed in step 19 to determine the defocus amount Xnow.

As mentioned above, in steps 13 to 15, the lens is switched to S.
When the W d e p is pressed, the camera moves to the position corresponding to the subject in the distance measurement field of view, so the defocus amount here is the in-focus state for the subject when the switch SW d e p is pressed for the first time. This is the amount of defocus up to the subject currently being framed for the lens position at . After the defocus amount for the current subject is determined in this manner, step 20 is executed.

Step 20. Here, based on the distance measurement results described above, a calculation is performed to divide the defocus mXnow by the minimum circle of confusion=35 μm.

The depth of field is calculated by dividing the defocus amount and the circle of least confusion, so this calculation allows you to
Depth information necessary to maintain focus on the subject position when pressing W d e o G up to the current subject position is obtained, and the current depth information disp ( This calculation result is set as 0).

Step 21: Execute the display 2 routine described above.

With this, depth information disp (0) and disp (1)
is displayed.

Since the depth information disp (0) is obtained in step 20 above, and disp (1) is O, the dot on the display disp2 is the dot of FNo. corresponding to the depth information obtained in step 20 above. and Fl dots are lit.

Now, suppose that the subject position when the switch SW dep is turned on for the first time is 2 m, and that the subject during subsequent distance measurement in step 19 is at a position of 3 m, and the defocus amount at this time is 450 μm. The depth information is disp (0) 412.8. Therefore, in this case, the comparator CP4 in Fig. 2 generates a detection output, lights up the dot D4, and maintains the lens position that is in focus for the 2m object, while also focusing on the 3m object. It is displayed that the FNo. required to achieve the desired state is 16.

Thereafter, in steps 22 and 23, a photometry and calculation display l routine is executed, and the aperture and shutter speed based on the photometry values at that time are displayed.

Step 24: The state of the switch 5WCLR is detected, and it is detected whether or not the second operation button is pressed.
．． The operation button is pressed and the switch SW CL
If R is on, the process moves to step 2, and the above-described operations after step 2 are executed again. This second operation button is a clear button, and when this button is pressed, depth display is prohibited and the normal operation mode is returned to. Further, if the second operation button is not pressed, the process moves to step 25.

Step 25: The current zoom information from the zoom information forming circuit is transmitted to the PQ port of the microcomputer UCOM via the communication controller C0NC0M, and the current zoom information is
It is detected whether the zoom information matches the previous zoom information detected before that. When it is determined that there is no mismatch as a result of this detection, that is, when the zoom ratio has been changed in the above operation process, the process moves to step 2 and returns to the normal operation mode.

Since the depth of field changes depending on the zoom ratio, if the zoom ratio changes during the process of obtaining depth information through the above series of operations, the depth information displayed by the display device disp2 will not be appropriate. Therefore, in the present invention, the zoom ratio change is detected as described above and the mode is shifted to the normal mode.

Further, when the zoom ratio has not been changed, the operating state of switch SW2 is detected in step 26, and switch SW2 is changed.
2 is off, the process returns to step 18 again. Therefore, once the switch SW de p is turned on, the switch SW de p and the switch: PSW2.5WCL
When R is off and the zoom ratio has not been changed, steps 18 to 26 are repeatedly executed and the focus state is maintained on the subject at the time when the switch S'Wdep was pressed for the first time. FN to keep even the current subject position in focus.

will be repeatedly displayed on the display device disp2.

If the shutter button is set to the second operation state in this state, the process moves to step 11, and photographing is performed according to the sequence routine described above. Note that the exposure at this time is controlled based on the shutter and aperture information obtained in steps 22 and 23 immediately before setting the shutter button to the second operation state.

Next, a case will be described in which the switch S W de p is once pressed, released, and then the switch S W de p is pressed again.

In this case, in the process of repeating steps 18 to 26 described above, depression of the switch SW dep is detected in step 18, so the step moves to 27 and subsequent steps, and the steps after step 27 are executed.

Step 27: Add 1 to the press count information n of the switch SW de p. Now, the second switch SW
d e p is pressed, and the first switch SW d
Since n=1 is set in step 16 by pressing ep, n=2.

Step 282: Execute the photometry routine described above. As a result, the lens that is in focus on the subject position when the switch SW d e p is pressed for the first time is in a focused state on the subject position when the switch SW d e p is pressed for the second time. Defocus amount X no
w is required.

Step 29: Execute X(n)=Xnow+XT.

(X (n): Defocus amount obtained when the number of times the switch SW dep is pressed xT: Defocus amount that is uniform for each subject) Since XT is currently set to 0 in step 16 , above, the calculation result is X(2)=Xnow.

Step 30: Calculate XP=(ΣX (K)l /n).

k=1 Now, n=:2, so the above XP is (X (1) +
X (2)) /2, and X (1) is step 1
6 is set to O, so xp is X (2) /
2=Xnow/2.

This calculation calculates the amount of movement of the lens to the intermediate position between the current lens position and the lens position for focusing on the subject position when the switch 3 W d e p is pressed this time. Focus amount is required. In other words, the intermediate position between the subject position when the switch SW dep is pressed for the first time and the subject position when the switch SW de p is pressed this time is determined.

Therefore, for example, as shown in FIG. 5, the first switch SW de
If object A is at a distance of 2 m when p is pressed, and object B at 5 m is placed in the distance measurement field when the switch SW de p is pressed next time, object A will be in focus in step 29. The defocus amount JIXnow =
A defocus amount XP is determined at a position between B and where subjects A and B have a uniform defocus amount. Now, in the above case, the defocus amount Xn for subject B
If ow=X (2) is 805 μm, then XP
is 805/2=403 μm.

Step 31 Perform two XP-XT to determine lens drive amount MV.
seek. Since XT is set to O, the lens drive amount information MV is XP, and in the above case, MV is 403 μm
becomes. In this case, the drive fi MV for the XP-XT is determined from the zoom information.

Step 32: The above lens driving routine is executed, and the lens changes from a state where the lens is focused on the subject A to a state where the lens is focused on the subject A,
The image moves to an intermediate position of 3.08 m, which provides a uniform defocus amount of 403 μm up to B.

Step 33: Set XT=XP.

Step 34: disp (K) = [X (K
) −XTI/ 35 w m (K = i,
n). Since n = 2 now, depth information d i sp (1) = X (1 ) -X P
735pm, disp (2)=X (2) -X
P35 μmG is determined.

As above, < X (1) is zero, X (2) is 805,
Since P is 403, disp (1) = -11,
5, disp(2)=+11.5 Step 35: The above display 2 routine is executed.

This completes the comparator CP4 in FIG. CP21 is activated and the dot D4. of the display array is activated. D21 lights up and displays the aperture FNo. at this time.

Step 362 The maximum absolute value of the depth information disp (k) for the object obtained each time in step 34 is set as the control aperture FNodep for this mode.

In the above case, disp (2) = 11.5 is the aperture FN
It becomes odep.

Step 37: Set the above aperture FNodep to A of Apex.
Convert it to a V value and set it as AVdep.

Step 38: The above AVdep and the minimum aperture AV of the lens
L (7 pixel), and when AVdep>AVL, that is, when AVdep is smaller than AVL, the value of AVdep is set to this minimum aperture AVL in step 40.

Further, when AVL≧AVdep, the process moves to step 39, where it is determined that AVdep<AVOf7), and AVdep<AVOf7).
At the time of AVO, that is, when AVdep is further open than AVO, the value of AVdep is set to the limit value AVO.

Further, when AVdep<AVO, the process moves to step 43.

Regarding steps 38 to 42 above, AVL≧AVdep
It is determined whether ≧AVO or not. In this case, the AVBLINK terminal of the microcomputer UCOM is turned off in step 43, and the process proceeds to step 18.

Also, when AVdep>AVL (7), AVdep is set to the limit value AVL, and in step 41 the terminal AVB is
After LINK is turned on, the process moves to step 18. At this time, if the switch SW dep is off, steps 19 to 23 are executed again. With this, the depth information disp (1) disp (2) when the switch 5 W de p is pressed each time and the depth information disp (0) corresponding to the defocus amount for the current subject position obtained in step 19 are It is displayed on the display device disp2 in the display 2 routine. As above
sp (1) disp (2) is +, -11,5
Therefore, dots D4 and D21 in Figure 2 light up, displaying FNo = FNodep to bring subjects A and B into focus, and furthermore, displaying FNodep to bring subjects A and B into focus.
Based on the defocus amount to bring the current subject position into focus from a lens located at a position where the amount of defocus is uniform for both, depth information disp is used to bring the current subject into focus F according to (0)
A dot indicating No is lit.

Therefore, it is also possible to know whether the current subject is in focus together with the subjects A-B.

Also, in the calculation display l routine at this time, since n=2, step 46 is executed, and the above AVdep becomes AV
The value is set as a value, and steps 51 to 56 are executed thereafter.

Therefore, in this case, the display 1 displays the above AVdep as the aperture value regardless of the setting mode, and the EV value at this time is EV-AVdep=TV! :: The TV value obtained is displayed as the shutter time.

At this time, when AVdep is > AVL, the displayed value is AVL.
Since the terminal AVBLINK is turned on in step 41, the aperture value is displayed blinking to warn that neither subjects A nor B will be photographed in focus. Also, when AVdep<AVO, AV
dep is set to AVO, but in this case, AVO has a deeper depth, so it is not configured to blink the aperture value.

After framing both subjects A and B while displaying the desired aperture value AVdep for both subjects A and B to be in focus as described above,
When the shutter button is moved to the second operating state, this is determined in step 26, and the process moves to step 11, where the above sequence routine is executed, and the aperture is controlled based on the above AVdep, and the Photography will be taken with both images in focus.

The above operation is the operation when the switch SW d e p is pressed twice, but even if the switch SW d e p is pressed twice or more, the same operation is performed to bring each subject into focus. AVdep is determined, and this is displayed and used for aperture control.

Effect> As described above, in the present invention, the aperture value for bringing different subjects into focus when operating the operating member is automatically determined, so even beginners can easily and reliably obtain the aperture value. It is possible to obtain photographs in which different subjects are both in focus when the operating member is operated, and the current subject is also in focus when the operating member is not operated. The aperture value for the current subject is determined and displayed together with the aperture value determined for the subject at the time of operating the operating member above. It is also possible to know whether the current subject will also be in focus depending on whether the aperture value is on the small aperture side or not.

In the embodiment, the amount of defocus for each object is uniform, but the amount of defocus may be set at a ratio of 10 for the object on the infinity side and 7 for the object on the closest side. The aperture value at this time may be determined by dividing the defocus amount on the closest side by the circle of least confusion, or by dividing the defocus amount on the infinity side by the circle of least confusion.

In addition, in the embodiment, the current aperture value and the aperture value at the time of operating the operating member are displayed, but instead of displaying the current aperture value, the aperture value for the current subject and the aperture value at the time of operating the operating member are displayed. The values may be compared in magnitude, and based on this result, a display may be made as to whether or not the current aperture is also in focus.

Further, in the embodiment, the defocus amount is divided by the circle of least confusion, but this value can be arbitrarily adjusted to make the focus state loose or severe.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a camera employing an aperture control device according to the present invention, and FIG.
FIG. 3 is a circuit diagram showing an example of sp2. 4(a) to 4(f) are flowcharts showing a program built into the microcomputer UCOM shown in FIG. 1, and FIG. 5 is an explanatory diagram showing the viewfinder field of the camera shown in FIG. 1. UCOM... Microcomputer AFD... Focus detection circuit disp2... Display

Claims (1)

[Claims] a lens drive circuit that moves a photographing lens to a position that internally divides the amount of defocus, based on the amount of defocus between each subject determined by a focus detection circuit when the operation member is operated; a first aperture calculation circuit that calculates an aperture value for bringing each subject within the depth of field when the operating member is operated based on the amount of defocus between the subjects; a control circuit that repeatedly activates the focus detection circuit to determine the amount of defocus for the current subject; and a control circuit that repeatedly operates the focus detection circuit to determine the amount of defocus for the current subject; a second aperture calculation circuit that calculates an aperture value for achieving a state in which the
1. A camera having an aperture display device, comprising: a display circuit that displays the relationship between the aperture value determined by the aperture calculation circuit and the aperture value determined by the second aperture calculation circuit.