JPS6385722A - Diaphragm determining device - Google Patents

Abstract

PURPOSE:To constitute the titled device so that even a beginner can execute easily focused photographing with respect to different objects, by calculating automatically a diaphragm for forming a focused state with respect to both the different objects. CONSTITUTION:The titled device is provided with a focus detecting circuit for deriving a defocus quantity for setting an object, to a focused state, and a diaphragm calculating circuit for calculating a diaphragm value corresponding to a defocus quantity between different objects, which has been detected by the detecting circuit, by which a photographing diaphragm is determined. For instance, with respect to the objects A, B, a defocus quantity which coincides with defocusing both the objects is derived by an auto focus device, and by dividing it by the minimum circle of confusion, a diaphragm value is derived. In this way, with respect to the objects, being in plural different positions, photographing can be executed in a state that the focus has been adjusted to each object.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to an aperture determining device.

<Prior art> Conventionally, the method of photographing multiple subjects in different positions with each subject in focus is to set the camera to a stop-down state and adjust the subject while checking the condition of each subject. The aperture that covers each subject was determined based on the brightness.

For this reason, photographing under the above circumstances is greatly influenced by the experience of the photographer, making it unsuitable for amateurs and having a high probability of failure.

Purpose The present invention was made in view of the above-mentioned matters, and it is an object of the present invention to provide an aperture control device that solves the above-mentioned problems by automatically determining an aperture value that ensures that a plurality of subjects are in focus. It is something.

To be more specific, in the present invention, the lens is moved to a position so that the defocus for multiple subjects is approximately halved, the aperture value that allows each subject to be within the depth of field is determined from the above defocus amount, and this is used as the photographing aperture. In this way, we aim to achieve the above objectives.

<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-mentioned aperture value is determined by determining the amount of defocus that matches the defocus for both wave objects using an autofocus device for subjects A and H, 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 an aperture determining device according to the present invention.

In the figure, SPC is an optical element for TTL opening, 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
Rl 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: BVO+SV+AVO/=BV+5V=E
Send V.

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

AD2 is an AD conversion circuit that transmits the output of the variable resistor VR2 to the PF port of the microcomputer UCOM for AD conversion. VH2 is a variable resistor that sets the minimum aperture value (minimum aperture value on the aperture side) AVL of the attached lens, and the output of this resistor VR3 is sent to the PG port of the microcomputer UCOM as a digital value via the AD conversion circuit AD3. tell.

SWMD is a mode setting operation member for setting the camera's maneuvering mode (shutter priority, aperture priority, program) information.
Inform the OM's PA port. 5WTV is a shutter speed setting member for setting shutter speed information, and 5WAV is an aperture setting member for setting aperture value information.
Input to PE port.

DAI is D for converting the control aperture value information sent from the PE port 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 MCI and a stop magnet MG2 for aperture control, and the above amplifier AMP2.
This is an aperture control circuit that controls the aperture based on the output ΔAV. EXPANDER is a real time expansion circuit for expanding the control shutter time information TV output from the PE port of the microcomputer UCOM and transmitting it to the shutter control circuit DRTV to control the shutter time. The shutter control circuit has a front curtain magnet MG3 and a rear curtain magnet MG4, and operates the shutter front curtain and rear curtain (not shown) by operating each magnet.

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

DISPI is a display device that digitally displays the shutter speed value and aperture value output from the PK port of the microcomputer UCOM on, for example, a 7-segment liquid crystal display. F: 7 UCOM (DAVB
The aperture display value blinks using the signal from the LINK 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 LED DI-D24 using the output of the LED DI-D24. The LEDD1
~D24 indicates the scale 5CALE arranged on the display board and marked with the FNO of the aperture, and displays the aperture value according to the depth information.

SW1 is a switch that is turned on when the shutter button (not shown) is in the first operating state, SW2 is a switch that is turned on when the button is in the second operating state, and 5Wdep is the first switch (not shown).
Switch that turns on when the operation button is pressed, 5WCLK
are switches that are turned on by pressing a second operation button (not shown), and these switches are input to the PD board 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. SWCMG is a detection/output 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 boat of the microcomputer UCOM. AFS is a focus detection circuit that calculates the amount of defocus until focusing based on the signal from the autofocus sensor that receives the light beam image incident through the photographic lens Ll, and the output of this circuit is sent to the PP port of the microcomputer UCOM. Reportedly.

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 ZMB and a code pattern board C0DI, and forms a digital value according to the lens zoom position.
The zoom information from the circuit is the zoom encoder ZOOM.
After being converted, it is transmitted to the PQ boat of the camera side microcomputer UCOM via the communication controller 〇〇NC0M.

CNT is an up/down counter to which lens drive amount information input from the PQ port of the microcomputer UCOM via the communication controller C0NC0M is set.
T is a motor control circuit that determines the lens drive direction (forward or reverse direction) based on the drive direction signal output together with the lens drive amount information. This circuit transmits the direction signal to the counter CNT and sets the counter in up or down mode. Determine. DR2 is a motor drive circuit that drives the motor MT2 in a direction determined by the motor control circuit CONMT, and the lens Ll is moved in the optical axis direction by a mechanism that is linked to the motor MT2. The LPI is a comb-like pattern that moves in conjunction with the movement of the lens L1, and the pattern turns on and off the contact piece LP2 as it moves, and a pulse is sent from the contact piece LP2 every time the lens moves by a 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 the microcomputer UCOM is powered on, 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 DISPI and DISP2 are sent from the PK and PL boats of the microcomputer UCOM, and the display circuits DISPI and DISP2 are turned off.

Step 3: Switch SW to the memory inside the microcomputer
Zero is set as the number-of-presses information n of d e p, and zero is set as the aperture value Avdep in depth priority, which will be described later. In this step 3 switch 5Wde
Number of presses n of p and aperture value AVdep in depth priority
is initialized.

Step 4: The states of switches SWI and SW2 are detected at the PD port of the microcomputer UCOM, and if the detection result is that switches SWI or SW2 are 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 ADF and input the defocus amount Xnow obtained by the focus detection circuit AFD based on the image incident on the sensor AFS via the lens Ll through the PP port of the microcomputer UCOM.

Also, the zoom information from the zoom information forming circuit is manually input to the PQ boat of the microcomputer UCOM via the controller C0NC0M.

Step 69: Narrow down the distance measurement subroutine and return to the main routine. Therefore, the process moves to step 6.

Step 6: Calculate the lens drive amount MV from the defocus amount Xnow determined 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 〇〇NC
The lens drive amount signal MV is transmitted to the pulse counter CNT via 0M. At this time, a signal representing the drive direction is also sent from the PQ boat 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 a direction determined by the above drive direction signal to move the lens Ll in the axial direction. This movement in the optical axis direction is linked to the lens Ll (converted into a pulse by the toothed pattern and the contact piece LP2, transmitted to the counter CNT, and counted, and the count value is the set lens drive amount MV. Counter CN when matched
A coincidence signal is sent from T, and this causes the motor control circuit CONMT to control the motor M by the motor drive circuit DR2.
Stop driving T2. 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.

Step 9 calls the arithmetic display routine of steps 44-56, 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), and in step 51, calculate Ev-A between the Ev value obtained in the photometry routine and the AVSET value.
VSET=Tv is made. Also, in step 49, A is selected 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 UCOM to the display DISPI, and the control is performed. 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.
PANDER, and in step 56 the process returns to the X-in routine, ie, step 10.

Step IO: The state of the switch SW2 in the PD board of the microcomputer UCOM is detected, and if the switch SW2 is on, the process moves to step 11, and if 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.

When the shutter button is moved to the second operation state during the above process, this is detected in step IO and step 11
is executed and the sequence routine of steps 57 to 63 is called.

In this routine, in step 5B, P of the microcomputer UCOM is
A signal is sent from the I port and the aperture control circuit DRAV is activated. The aperture control circuit DRAV operates the magnet MCI 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, it operates the magnet MG2 to drive the aperture regulating member. stop.

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, so the output of the amplifier AMP2 shows the ΔAV value according to the control aperture value AV). With the above operation, the aperture becomes the control AV value.

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. Also, in step 59, the state of the switch 5WCHG is detected,
Step 60 is performed by turning off the switch 5WCHG.
Allow transition to .

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. As a result, the drive circuit DRI is activated, and the motor MTI drives the mechanical charging mechanism to perform shutter charging and aperture charging 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 UCO is activated in step 62.
A stop signal is sent from the PN boat of M, and the drive circuit DRI
becomes inoperative, the drive of the motor MTI is stopped, and the process returns to the X-in routine at step 63. Step 1 above
At step 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 SW de p is read by the Pv board of the microcomputer UCOM, and when the switch SW 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 O.

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 DISP (n) each time the switch 5WDISP is pressed.
Display on P2.

n=1 is set in step 16, and DISP(0
) and DISP (1) are set to O, so D
ISP (n) becomes DISP (1), and DISP
(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.
), DISP (1) = O is detected by the comparator array, and based on the detection result (selects the driver and lights up the corresponding dot. Now the information DISP (0) and DIS
Since P (1) is 0, the comparator CP12 generates a detection output and the dot DI2 corresponding to the scale F1
lights up.

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 described above (in steps 13 to 15, switch the lens 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, the defocus amount Xnow based on the distance measurement result is divided by the minimum circle of confusion=35 μm.

Depth of field is calculated by dividing the amount of defocus by the circle of least confusion, so by this calculation, switch the lens to S.
Depth information necessary to bring the current subject position into focus while maintaining focus on the subject position when W d e p was pressed is obtained, and the current depth state 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) has been obtained in step 20 above and DISP (1) is 0, the dot on the display DISP2 indicates the FNO corresponding to the depth information obtained in step 20 above. Light up the dot and the dot Fl.

Now, suppose that the subject position is 2 m when the switch SW dep is turned on for the first time, and that the subject is 3 m at the time of distance measurement in subsequent step 19, and the defocus amount at this time is 450 μm. The depth information is DISP (0)'q12.8. 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. The FNO required to achieve this condition is 16
.

Thereafter, in steps 22 and 23, the photometry and calculation display 1 routine is executed, and the aperture and shutter speed are displayed based on the photometry values at that time.

Step 24: The state of the switch 5WCLR is detected, and it is detected whether or not the second operation button is pressed.
If the operation button 5WCLR is pressed and the switch 5WCLR is turned 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. Also second
If the 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, as described above, the zoom ratio change is detected 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 5WDEP is turned on, the switch 5WD
If EP and switch SW2.5WCLR are off and the zoom ratio has not been changed, steps 18 to 2
6 is executed repeatedly and the FNO to bring the current subject position into focus is displayed on the display DISP2 while maintaining the focus state on the subject at the time when the switch 5WDEP was pressed for the first time. It will be displayed repeatedly.

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 SW dep is once pressed and then released, and the switch 5WDEP is pressed again.

In this case, in the process of repeating steps 18 to 26 described above, pressing of the switch 5WDEP is detected in step 18, so the step moves to 27 and thereafter, and step 2
Steps 4 and subsequent steps 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 was set in step 16 by pressing ep, n=2.

Step 28: 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. The defocus amount Xnow is determined.

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)]/n.

k=1 Now, n=2, so the above xp is (X (1)
(2)) /2, and since (1) is set to 0 in step 16, XPltX (2)/2=
It becomes 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 to bring it into focus with respect to the subject position when the switch SW dep 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 initial switch S W d
If subject A is at a distance of 2 m when e p is pressed, and subject B at 5 m is brought into the distance measurement field when the switch S W de p is pressed next time, subject A will be in focus in step 29. The defocus amount Xnow=X (2) until subject B is brought into focus is determined from the state, and step 3
0, half of this defocus amount, that is, subject A,
A defocus amount xP to a position between H and where subjects A and B have a uniform defocus amount is determined.

Now, in the above case, the defocus amount for subject B is
If v=X (2) is 805 μm, xp becomes 805/2=403 μm.

Step 31: Perform XP-XT and drive lens, II
Find the MV. Since XT is set to 0, the lens drive amount information MV is XP, and in the above case, MV is 40.
It becomes 3 μm. In this case, depending on the zoom information,
The driving amount MV for T is determined.

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)−X
T)/35 w m (k = i, n). Since n=2 now, the depth information DISP is used to bring the current lens position into focus even at the nth subject position of the switch S W d a p.
(1) =X (1) -XP/35μm5DISP
(2)=X (2)-XP35umG is calculated.

As above, < X (1) is zero, X (2) is 805, x
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 36: The maximum absolute value of the depth information DISP (k) for the subject each time obtained in step 34 is set as the control aperture FNOdep for this mode.

In the above case, DISP (2) = 11.5 is the aperture FNO
It becomes dep.

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
Compared with L (apex), when AVdep>AVL,
That is, when AVdep is a smaller aperture than AVL, the value of AVdep is set to the minimum aperture AVL in step 40.

Moreover, when AVL≧AVdep, the process moves to step 39 and AVdep<AVO (D judgment is made, and AVdep<A
At the time of VO, that is, when AVdep is more 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 5WDEP is off, steps 19 to 23 are executed again. With this, the depth information DISP each time the switch SW dep is pressed
(1) DISP (2) and depth information DISP (0) corresponding to the defocus amount for the current subject position determined in step E9 are displayed on the display device DISP2 in the display 2 routine. As above < DISP
(1) Since DISP(2) is +, -11,5, dot D4. D21 lights up, subject A,
FNO=F to bring B into focus
NOdep is displayed, and the current subject is also brought into focus based on the defocus amount for focusing the current subject position from the lens located at a position where the amount of defocus is uniform for both subjects A and H. A dot indicating the FNO corresponding to the depth information DISP (0) for achieving a state of alignment is lit.

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, regardless of the setting mode, the above AVdep is displayed as the aperture value on the display 1, and the TV value obtained by (7) EV value is used as the shutter seconds. Sometimes displayed.

At this time, when AVdep is > AVL, the displayed value corresponds to AVL, and since the terminal AVBLINK was turned on in step 41, the aperture value is displayed blinking.
Warns that both subjects A and B will not be photographed in focus. Also, when AVdep<AVO, AVd
ep is set as AVO, but in this case, since AVO has a deeper depth, the aperture value is not configured to blink.

After framing subjects A and B with the aperture value AVdep displayed to bring both subjects A and H into focus as described above, move the shutter button to the second operating state. Step 2
This is determined in step 6, and the process moves to step 11, where the above sequence routine is executed, and the aperture is adjusted to the above A.
Control is performed based on Vdep, and photography is performed with subjects A and H both 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.

As described above, in the present invention, the aperture that brings different subjects into focus is automatically calculated, so even beginners can easily shoot different subjects in focus. It is possible if you do it.

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. 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 FIGS. UCOM...Microcomputer AFD...Focus detection circuit DISP2...-Display diagram CC) Zetsufuzu (5)

Claims (1)

[Claims] It has a focus detection circuit that calculates the amount of defocus to bring the subject into focus, and an aperture calculation circuit that calculates the aperture value according to the amount of defocus between different subjects detected by the detection circuit. An aperture determining device characterized by determining.