JPS6391614A - Lens driving device - Google Patents

Abstract

PURPOSE:To speedily move a lens to the position where respective objects are in focus by moving the lens to the position where the object is in focus by a 1st operation of an operating member and moving the lens to the position where the quantity of defocusing of the object is divided internally by the next operation of the operating member. CONSTITUTION:A lens side consists of a zoom brush ZMB and a code pattern plate COD 1 and is provided with a zoom information forming circuit which generates a digital value corresponding to the lens zoom position, and zoom information from the circuit is converted by a zoom encoder ZOOM and then sent to the PQ port of a camera-side microcomputer UCOM through a communication controller CONCOM. In this case, an autofocus device finds the coincident quantity of defocusing of objects A and B and the lens is moved to the position; and the coincident defocusing quantity is divided by the value of the circle of the least confusion to find an aperture value, thereby putting both objects in focus.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a lens driving device that drives a lens according to the amount of defocus to a subject.

<Prior art> Conventionally, the method of photographing multiple subjects at different positions with each subject in focus is to bring the lens into focus at a position between the multiple subjects, and then move the camera. was used as the aperture condition, and while checking the condition of each subject, the aperture that covered each subject was determined based on the depth of field.

For this reason, shooting under the above conditions is based on the photographer's experience.

etc., making it unsuitable for amateurs and having a high probability of failure.

Purpose> The present invention was made in view of the above matters, and it moves the lens to a position that internally divides the amount of defocus between multiple subjects, and adjusts the aperture so that each subject falls within the depth of field from the defocus n. In addition to calculating the value and solving the above problem, when defocus is detected for the first subject, the lens is moved by the above defocus amount to focus on the subject, and the defocus amount is adjusted for the next time when defocus is detected. In this case, the lens is driven to the internal division point where the internal division process has been performed.

By doing this, you can quickly move the lens to the internal position of multiple subjects, and also check that each subject is in focus by looking through the viewfinder before shooting. It is something that can be done.

<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 defocus amount for subjects A and B is determined using an autofocus device so that the defocus for both wave objects coincides, the lens is moved to this position, and this coincident defocus amount is further calculated. The above aperture value is obtained by dividing by the circle of least confusion, and a state in which both wave objects are in focus is obtained.

Next, examples of the present invention will be described.

FIG. 1 is a circuit diagram showing an embodiment of a camera having a lens driving 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.

ADI is the output of the above amplifier ADDI (EV of Apex)
), and its output is the P of the microcomputer UCOM (hereinafter referred to as microcomputer).
It is input to the E port.

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. 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 PC 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 shooting mode (shutter priority, aperture priority, program) information, and the mode information according to the setting mode is sent to the microcontroller UC.
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 PB port.

DAI is D for converting the control aperture value information sent from the PH port of the microcomputer UCOM into analog (voltage).
In the A conversion circuit, the output from the circuit DAI is input to the amplifier A M P 2 constituting the subtraction circuit;
At P2, calculation is performed with the AVO set in the resistor VR2, and the output is the number of aperture stages (△A of the apex).
V) is required.

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 PJ 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 MG 3 and a rear curtain magnet MG 4, and operates the shutter front curtain and rear curtain (not shown) by operating each magnet.

The above control circuits DRAV and DRTV are microcontroller UCOM.
It is activated by a signal from the PI port of the camera and starts controlling the aperture and shutter.

displ 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.
The aperture display value blinks using the signal from the INK 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 5Wdep is a switch that is turned on when the first operation button (not shown) is pressed. Switch that turns on, 5WC
LK is a switch that is turned on by pressing a second operation button (not shown), and these switches are connected to the PD of the microcomputer UCOM.
input to the port.

DRI is a motor driver that is connected to the PN port of the microcomputer UCOM and operates the motor MTl 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 the signal from the autofocus sensor that receives the light flux image incident through the photographic lens L1, 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 port of the camera side microcomputer UCOM via the communication controller 〇〇NC0M.

CNT is an up-down counter, CONMT, in which lens drive amount information input from the PQ port of the microcomputer U COM via the communication controller C0NC0M is set.
is a motor control circuit that determines the driving direction (forward or reverse direction) of the lens based on the driving direction signal output together with the lens driving amount information, and this circuit transmits the above direction signal to the counter CNT to set the counter in up or down mode. decide. DR2 is a motor drive circuit that drives the motor MT2 in a direction determined by the motor control circuit CON MT, and the lens L1 is moved in the optical axis direction by a mechanism linked to the motor MT2. LPI is lens L
The pattern is a comb-like pattern that moves in conjunction with the movement of the contact piece L.
A pulse is sent from P2 every time the lens moves by 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 power to the microcomputer UCOM is turned on, a power-up clear is performed in step 1, and thereafter operations are performed in the following order of steps.

Step 2: A signal to turn off each display circuit displ, disp2 is sent from the main UCOM (DPK, PL port).
sp2 goes out.

Step 3: Switch SW to the memory inside the microcomputer
Set zero as the number of presses information n of d e p,
In addition, the aperture value 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 states of switches SWI and SW2 are detected at the Pv port of the microcomputer U COM. If the detection result is that switch SWI or SW2 is on, proceed to step 5; if SW1 and SW2 are off, proceed to step 1.
Proceed to step 2.

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 U COM via the controller C0NC0M.

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 fiMV 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 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 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 a direction determined by the above drive direction signal to move the lens LL in the optical axis direction. This movement in the optical axis direction is linked to the lens Ll (converted into a pulse by the tooth-shaped pattern and the contact piece LP2, and the counter CNT
A count 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 drive fiMV and becomes in 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 U COM, 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=0, so the step moves to 48.

Step 48: Read the mode information to the PA port of the microcomputer UCOM, and use the mode setting operation member S W M D
If the mode set is aperture priority, step 47 is executed, if shutter priority is selected, step 50 is executed, and if the program mode is set, step 4 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 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 by the shutter speed setting member 5WTV input to the PC port of the microcomputer UCOM is read, and in step 52, the calculation EV is calculated with the EV value obtained in the photometry routine. -TV
SET=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 desired shutter speed and aperture value will be displayed. Also, in step 54, the control AV value is input to D via the PH port of the microcomputer UCOM.
The signal is transmitted to the A' conversion circuit DAI, and a voltage corresponding to the AV value is output. Further, in step 55, the control TV value is transmitted to the real time expansion circuit EXPANDER via the PJ port of the microcomputer UCOM, and in step 56, the process returns to the main routine, that is, step 10.

Step IO=The state of the switch SW2 at the PD port of the microcomputer UCOM 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.
O 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.

If the shutter button is moved to the second operation state during the above process, this is detected in step 10 and step 11
is executed and the sequence routine of steps 57 to 63 is called.

In this routine, in step 58, 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 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 U is activated in step 62.
Send a stop signal from the PN port of COM, and drive circuit D
The PI becomes inactive, the driving of the motor MTI is stopped, and the process returns to the main routine in step 63. In steps 1 to 11 above, a series of camera operations are controlled during normal operation.

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 at the Pv port of the microcomputer UCOM, and when the switch SW de p is on, the process moves to step S13.

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 dfsp (0
) and the depth information corresponding to the depth information disp (n) at the time of each press of the switch S W di S p is displayed on the display device disp2.

In step 16, n=1 is set, and disp(0
) and disp (1) are set to 0, so d
isp (n) becomes disp (1), and disp
(0), disp(1) =O is displayed.

This information disp (0) and disp (L) 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) = 0 is detected by the comparator array, a driver is selected based on the detection result, and the corresponding dot is lit. Now information disp (0) and di
Since sp (1) is 0, comparator CP12
generates a detection output and the dot D1 corresponds to the scale Fl.
Turn on 2.

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-mentioned photometry routine is executed in step 19 to determine the defocus fi X n ov.

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, a calculation is performed to divide the defocus it Xnow based on the distance measurement result by the circle of least 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 is pressed 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 0, the dot on the display disp2 is the dot of the 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) = 12.8. 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 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.
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 SW de p is turned on, the switch SW de p and the switch SW2.5WCLR
is off and the zoom ratio is not changed,
Steps 18 to 26 are repeatedly executed to maintain the focus state on the subject at the time when the switch SW dep was pressed for the first time, and to bring the current subject position into focus as well. FN.

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 determined in step 22. immediately before the shutter button is placed in the second operation state. The control is performed based on the shutter and aperture information obtained in step 23.

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 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. Defocus fi X n
ow 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 is n; XT: Defocus amount that is uniform for each subject) Since XT is currently set to O in step 16 , above, the calculation result is X(2)=Xnow.

Now, since n=2, the above xp is (X (1) 1X
(2)) /2, and X (1) is step 16
Since it is set to O, xp is X (2) /2
=Xnow/2.

In this calculation, the current lens position is calculated as if the lens moves to an intermediate position between the subject position when the switch SW dep is pressed this time and the lens position to be in focus. Focus amount is required. In other words, the intermediate position between the subject position when the switches S' and V d e p are pressed for the first time and the subject position when the switch S W d e p is pressed this time is determined.

Therefore, for example, as shown in Fig. 5 (initial switch SW 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 is found at a position between B and where the defocus amount is uniform for subjects A and B. Now, in the above case, the defocus amount Xn for subject B
If ow=X (2) is 805 p m, x
p is 805/2 and 403 μm.

Step 31: Perform XP-XT and calculate 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.
It becomes μm. In this case, depending on the zoom information,
The drive amount MV is calculated for the drive amount MV.

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 μm (K=i, n). Since n=2 now, the depth information disp (1) is used to bring the current lens position into focus even at the nth subject position of the switch SW de p.
=X (1) -XP/35um, disp (
2) =X (2) -XP/35 it m is calculated.

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 36: The maximum absolute value of the depth information disp (K) for each subject obtained in step 34 above 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 Two above AVdep and lens small aperture Av
Compared with L (apex), AVdep > AVL (7)
In other words, when AVdep is smaller than AVL, in step 40 the value of AVdep is set to the minimum aperture AVL.
Set to .

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.

In addition, AVdep>AVL (when D, AVdep is set to AVL which is the limit value, and in step 41, the above-mentioned terminal AVBL
Once INK 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 d when the switch S W d e p is pressed each time
isp (1), disp (2), and depth information disp (0) corresponding to the defocus amount for the current subject position determined in step 19 are 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, and the FN is used to bring subjects A and B into focus.
o=FNodep is displayed, and the current subject is also determined based on the defocus amount for focusing the current subject position from the lens located at a position where both subjects A and B have a uniform defocus amount. F N according to depth information disp (0) to bring it into focus
A dot indicating o is lit.

Further, in the calculation display 1 routine at this time, since n = 2, step 46 is executed, the above AVdep is set as the AV value, and steps 51 to 56 are thereafter executed.

Therefore, in this case, regardless of the setting mode, the display 1 displays the above AVdep as the aperture value, and also uses the TV value obtained by (7) EV value as the shutter speed as EV-AVdep=TVl: 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, AV
dep is set to AVO. However, in this case, since AVO has a deeper depth, it is not configured to blink the aperture value.・Aperture value AV to bring both subjects A and B into focus as described above
After framing both subjects A and B while displaying dep, 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. ,
In this way, the aperture is controlled based on the above AVdep, and photography is performed with both subjects A and B 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 lens is moved to a position where the subject is in focus when the operating member is operated for the first time, and the lens is moved to the position where the subject is in focus when the operating member is operated next time). Since the defocus for the subject is moved to a position that is internally divided, the lens can be quickly moved to a position where each subject is in focus, and the focus state of each subject can be checked in advance through the viewfinder before shooting. can be confirmed.

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 can be found by dividing the amount of defocus on the closest side by the circle of least confusion, or by dividing the amount of defocus on the infinity side by the circle of least confusion.

In addition, in the example, the calculated aperture value is outside the small aperture limit (=
At certain times, the display is flashing, but instead of this, a dedicated warning element may be provided, or a sound may be used to warn the user, and of course, any form of warning may be used. be.

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 a lens driving device according to the present invention, and Fig. 2 is a display device d shown in Fig. 1.
FIG. 3 is a circuit diagram showing an embodiment of isp2. Figures 4(a) to (f) show the microcomputer U COL in Figure 1.
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 focus detection circuit that detects the amount of defocus when the operating member is operated, and a focus detection circuit that drives the photographing lens according to the amount of defocus detected by the detection circuit to bring the subject into focus when the operating member is operated. In the lens driving device, an arithmetic circuit is provided that responds to the second operation of the operating member and internally divides the amount of defocus determined by the focus detection circuit for the subject at the time of the second operation, A lens driving device, characterized in that the lens is driven to a position that is an internal division of the amount of defocus determined by the arithmetic circuit.