JPS63172132A - Depth of field priority controller - Google Patents

Abstract

PURPOSE:To automatically determine the aperture by providing a defocus extent storage means where the extent of defocus is stored and a forcibly setting means which forcibly sets the auto-focusing control mode to the one shot mode in case of the depth of field priority photographing mode. CONSTITUTION:A lens is moved to the intermediate position by a lens driving means. An operating means which calculates such aperture on the basis of the extent of defocus that first and second objects are put within the depth of field, a lens position storage means where the lens position is stored, a defocus extent storage means where the extent defocus is stored, and the forcibly setting means which forcibly sets the auto-focusing mode to the one shot mode in case of the depth of field priority photographing mode are provided. Consequently, the aperture corresponding to the extent of defocus between first and second objects is calculated, and the servo mode is automatically switched to the one shot mode though the servo mode is selected in the auto- focusing control mode. Thus, the aperture which ensures simultaneous in-focus states of plural objects is automatically determined, and the conformability to the auto-focusing control function is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a depth of field priority control device that determines the aperture of a photographic lens in consideration of the depth of field.

(Background of the Invention) Conventionally, methods for photographing a plurality of subjects at different positions with each subject in focus are as follows:
The camera was set to aperture mode, and while checking the condition of each subject, the aperture that covered each subject was determined based on the field brightness.

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

(Objective of the Invention) An object of the present invention is to solve the above-mentioned problems, to be able to automatically determine an aperture that ensures that multiple subjects are in focus, and to be able to automatically determine an aperture that ensures that multiple subjects are in focus. It is an object of the present invention to provide a depth-of-field priority control bag that can improve consistency.

(Features of the Invention) In order to achieve the above object, the present invention provides a mode selection means for selecting a depth-of-field priority shooting mode, and a distance-measuring means for detecting a first subject in the depth-of-field priority shooting mode. A distance measurement is performed, and the lens is moved to an in-focus position with respect to the first subject by a lens driving means, and the lens position is memorized.A second subject is ranged by the distance measurement means, and the amount of defocus is memorized. The intermediate position is calculated by internally dividing the lens moving distance corresponding to the defocus amount at a predetermined rate, the lens is moved to the intermediate position by the lens driving means, and the first position is calculated from the defocus amount. and a calculation means for calculating an aperture at which the second subject falls within the depth of field, a lens position storage means for storing the lens position, a defocus amount storage means for storing the defocus amount, and a field of view. The depth-priority shooting mode includes a forced setting means for forcibly setting the automatic focus control mode to the one-shot mode, so that the aperture is calculated according to the amount of defocus between the first and second subjects. In addition, even if the automatic focus control mode is selected as the servo mode, it is characterized in that the automatic focus control mode is automatically switched to the one-shot mode.

(Embodiment of the Invention) FIG. 1(A) is a block diagram showing the basic configuration of an embodiment of the present invention, and FIG. 1(B) is a diagram showing its sequential processing.

The depth mode selection means 1 is a means for selecting depth-of-field priority shooting (hereinafter simply referred to as depth) mode. selected. When the depth mode is selected, a low level signal is sent from the depth mode selection means 1 to the calculation means 2, and when the normal mode is selected, a high level signal is sent. In the normal mode, the program AE mode and aperture priority AE selected by an AE mode selection means (not shown) are selected.
mode or another AE mode such as shutter priority AE mode.

The AF mode selection means 3 has two modes: a servo mode that follows the movement of the subject and always moves the photographing lens to the in-focus position; A one-shot mode that does not move the tonneau is selected. When the servo mode is selected, a high-level signal is output, and when the one-shot mode is selected, a low-level signal is output.

The AND gate G constitutes the forced setting means 4 of the present invention, and even if the AF mode is selected as the servo mode by the AF mode selection means 3, if the AF mode is the depth mode,
By inverting the output to a low level and transmitting it to the calculation means 2, the AF mode is forcibly set to the one-shot mode.

After selecting the depth mode, the photographer first turns on the metering switch SWl with the first stroke of the near point button.
Perform the first depth operation. Thereby, the calculating means 2 causes the distance measuring means 5 to measure the distance of the subject a on the near point side, obtains the in-focus position, and causes the lens driving means 6 to move the photographing lens of the camera to the in-focus position. Then, the lens position is stored in the lens position storage means 7, and the fact that this is the first depth measurement is stored in the counter means 8.

The photographer once turns off the photometry switch swl, selects the subject on the far point side as the distance measurement target, and performs the second depth operation by turning on the photometry switch swl again.

As a result, the calculating means 2 causes the distance measuring means 5 to measure the distance of the object on the far point side, obtains the amount of defocus on the image plane, stores it in the defocus amount storage means 9, and sets the depth at the second time. A certain fact is stored in the counter means 8.

After turning off the metering switch swl, the photographer places the near-point subject a and the far-point subject A within the shooting screen.
The photometry switch swl is turned on, and the depth operation is performed for the third time in step 1. As a result, the calculation means 2 reads out the defocus amount stored in the defocus amount storage means 9, and calculates the defocus amount. The intermediate position 21c is calculated by internally dividing the lens moving distance corresponding to the amount by a predetermined ratio, for example 7:10, and the lens is moved to the intermediate position C by the lens driving means 6. At the same time, by dividing 7/17 of the defocus amount (which corresponds to the defocus amount at the intermediate position 1c) by the circle of least confusion, 354 m, both the near-point side subject a and the far-point side subject a are brought within the depth of field. The aperture to be entered is calculated and displayed on the display means 10. Further, the aperture determination operation based on depth is completed by operating the photometry switch swl 0 or more times to cause the counter means 8 to store that it is the 23rd time of digitalization.

The calculating means 2 may take in the photometric value from the photometric means 11 for each depth measurement, or may take in the photometric value only for the 23rd digital measurement. The shutter speed is calculated from the calculated aperture, and the shutter speed is also displayed on the display means 10 together with the aperture.

When the photographer turns on the release switch sw2 at the same time as the 23rd digital shot or after that, the calculation means 2 outputs the aperture and shutter speed to the exposure control means 12, and causes the exposure operation to be performed. As a result, it is possible to take a photograph in which the near-point side subject a, the far-point side subject A, and all the subjects between them are in focus.

According to this embodiment, the subject a is closer to the near point than the defocus amount.
Since the aperture is calculated so that both the subject and the subject on the far point side fall within the depth of field, it is possible to automatically determine the aperture that ensures that both the subjects are in focus. Furthermore, even if the AF mode is selected as the servo mode, it is automatically switched to the one-shot mode, which improves the compatibility with the AF function.

In the IF diagram, the lens is not driven at the second time of depth, but it may be possible to drive the lens at the second time of depth. The photographer can clearly see the image, making the operation easier to understand.

It goes without saying that it is also possible to measure the distance to the far-point side object A in the first depth measurement, and to measure the distance to the near-point object A in the second depth measurement.

The predetermined ratio for internally dividing the defocus amount is not limited to 7:10, but may be, for example, 1:1.Also, to calculate the aperture, the defocus amount at the intermediate lie is divided by the circle of least confusion. However, the defocus amount may be converted into an aperture using a table.

In the above explanation, the lens is driven to the intermediate position C and the aperture is calculated based on the depth at the 23rd time of digital measurement, but these may be performed at the second time of depth measurement, that is, when the photometry switch swl is turned on twice. The operation may end the driving of the lens to the intermediate position Mc and the aperture determining operation based on the depth.

In FIG. 1, a photometric switch SW1 that is turned on by the first stroke of the shutter button is used as the operating means, but a separately provided photometric switch may also be used.
An operation means dedicated to depth may be provided.

A specific configuration of the embodiment shown in FIG. 1 is shown in FIG. 2.

SPC is a light-receiving element for TTL open photometry, DI is a diode for logarithmic compression, and AMPI is an operational amplifier, which constitute a photometry means and determine the open brightness Bv.

Output (apex value). VRl is a variable resistor for setting film sensitivity and outputs film sensitivity Sv. VH2
is the maximum aperture Av of the attached lens.

VH2 is the variable resistor for setting the maximum aperture of the attached lens, VH2 is the variable resistor for setting the minimum aperture of the attached lens (minimum aperture on the stop-down side), ADD is Bvo+S
Adder that calculates v+Avo=By+5v=Ev, AD
I and AD2 are A/D conversion circuits, DAI is a D/A conversion circuit that converts the aperture Av output from the PH board of the microcomputer COM into an analog voltage, and AMP2 is a subtracter that calculates the number of aperture stages ΔAv = Av - Avo. ,DRAV
is an aperture control circuit that has a start magnet MG1 and a stop magnet MG2 for aperture control and controls the aperture based on the number of aperture stages ΔAv, and EXP is a shutter speed T output from the PJ boat of the microcomputer COM.
The real-time expansion circuit DRTV has a leading curtain magnet MG3 and a trailing curtain magnet MG4, which expands v into real time, and controls the running of the leading curtain and trailing curtain based on the shutter speed output from the real-time expanding circuit EXP. shutter control circuit to control,
DISP is the calculated aperture, shutter speed and depth 1
The display device COM that performs the second and second displays is a microcomputer having an FA port to a PP port.

swAF is an AF mode selection switch that selects the AF mode between servo mode and one-shot mode.
wEV is a photometric value selection switch that selects the photometric value Ev in depth mode to either the average value of the first and second depth measurements or the latest value of the third depth measurement, and swDEP selects either depth mode or normal mode. Depth mode selection switch, swl is a photometry switch that is turned on by the first stroke of the shutter button, sw2 is a release switch that is turned on by the second stroke of the shutter button, swCHG is turned on when charging is completed, and turned off when shutter travel is completed. The charge switch, MTI is a charge motor that drives a charge mechanism such as a shutter and a film winding mechanism, DRI is a motor drive circuit that energizes the charge motor MTI, and AFS is an AF that receives a subject image incident through the photographic lens L1. Sensor and AFD are A
This is a focus detection circuit that calculates the defocus amount d up to the in-focus position on the image plane based on the signal from the F sensor AFS.

Each of the above-mentioned elements except for the photographic lens L1 is provided on the camera side, and each element described below is arranged on the lens side attached to the camera, and information is communicated between the camera and the lens via the communication controller CC. will be done.

BRI is a brush that is linked to the movement of the lens position of the photographic lens L1, C0DI is a code pattern plate that works together with the brush BRI to detect the position (range ring position) of the photographic lens L1, and ENCI is a code that encodes the lens position into a digital signal. BH3 is a brush that is linked to changes in focal length due to zooming, C0D2 is a brush BR2
A code pattern plate that works together with E to detect the focal length.
NC2 is a zoom encoder that encodes the focal length into a digital signal.

CM is a motor drive circuit DR2 in response to a lens drive amount signal and a lens drive direction signal input from the PP port of the microcomputer COM via the communication controller CG.
a motor control circuit that controls the displacement pulse counter CNT and determines an up mode or a down mode of the displacement pulse counter CNT;
MT2 is a lens drive motor that is energized by the motor drive circuit DR2 in a direction corresponding to the lens drive direction to move the photographic lens L1 in the optical axis direction, and LPI is a lens drive motor that moves the photographic lens L1 in the optical axis direction.
A comb-like pattern linked to the movement of , LP2 is <L*f
Culture pattern LPI 1. The contact piece CNT, which sends out a displacement pulse every unit length movement of the expansion lens L1, is set by the lens drive amount signal input from the communication controller CC, and counts the displacement pulse input from the contact piece LP2.
When the counted value matches the set value, motor control circuit C
Displacement that commands M to stop lens drive motor MT2, <
is a counter.

Next, the operation of the microcomputer COM will be explained with reference to the flowcharts of FIGS. 3 and 4.

[Step 1] When a power source (not shown) is turned on, a power-up clear is performed.

[Step 2] How many times is the depth (photometry switch swl
n register indicating whether the aperture determination operation based on depth has been completed, and n register indicating whether distance measurement and lens driving in one-shot mode have completed, respectively. Reset to .

[Step 3] Various modes are selected by the photographer. Now, assume that the depth mode is selected by the depth mode selection switch swDEP, the first subject is the object of distance measurement, and the photometry switch swl is turned on for the first time.

[Step 4] Detect the state of the photometry switch swl,
Since it is on, proceed to step 5.

[Step 5] Start the timer. This timer sets the aperture determined by the depth to the metering switch swl.
This is to measure a predetermined period of time (for example, 8 seconds) that is maintained after the switch is turned off.

[Step 6] Set the l register, which indicates that the photometry switch swl is turned on, to 1.

[Step 7] Detect whether a charging completion signal is input to the FD boat from the strobe device attached to the camera. If not, proceed to step 8. If it is, proceed to step 9. , this routine will be described later.

[Step 8] Determine whether it is depth mode. Since we are currently in depth mode, step 10
Proceed to.

[Stage 2B 10] Determine how many times the depth is,
Since this is the first depth test, proceed to step 11.

[Step 11] Determine the m register indicating whether or not the lens is driven in depth mode. Since the lens has not been driven yet, proceed to step 12.

[Step 12] The focus detection circuit AFD is operated, and the first light incident on the AF sensor AFS via the photographic lens L1
The defocus ID of the image of the subject is taken in through the PN port.

[Step 13] Calculate the lens drive amount and lens drive direction from the defocus amount d obtained in step 12,
These are output from the PP boat. As a result, the lens drive amount is set in the displacement pulse counter CNT, and the up mode or down mode is set depending on the lens drive direction. The motor control circuit CM determines the forward and reverse rotation direction of the lens drive motor MT2 according to the lens drive direction. Furthermore, the motor control circuit CM is a motor drive circuit DR2.
is operated, and the photographing lens L1 is moved in the optical axis direction by the lens drive motor MT2. This movement in the optical axis direction is converted into a displacement pulse by the comb pattern LPI and the contact piece LP2, and counted by the displacement pulse counter CNT. When this count value matches the set lens drive amount, a match signal is output from the displacement pulse counter CNT to the motor control circuit CM, which causes the motor control circuit CM to stop driving the lens drive motor MT2 by the motor drive circuit DR2. The photographing lens L1 is moved by the lens drive amount by a movement of 0 or more, and reaches the in-focus position.

[Step 14] Store 1 in the m register.

m=1 means that lens driving has already been performed.

[Step 15] Determine whether the n register is 0 (whether this is the first time of depth).

Since this is the first depth test, proceed to step 16.

[Step 16] Store the lens position of the first depth measurement in the built-in memory.

[Step 17] The photometric value Ev, which is the output of the A/D conversion circuit AD1, is taken in through the PP boat.

[Step 18] The photometric value taken in step 17 is stored in the built-in memory as EvO.

[Step 19] Determine whether it is depth mode.

[Step 20] This is a step to correct the aperture A vdep due to depth according to the change in focal length due to zooming.
has not been determined yet, so it will be passed as is.

[Step 21] This is the step of comparing the aperture A vdep based on the depth with the minimum aperture A1 on the aperture side, but since this is the first depth and the aperture A vdep has not been determined yet, it is passed through as is.

[Step 22] Aperture A vdep based on depth causes display to be performed further on the aperture side than the minimum aperture A1 on the aperture side, but for now it passes through as is.

[Step 23] It is determined whether the K register is 1 (whether the aperture A vdep based on depth has been determined). Since it has not been determined yet, proceed to step 24.

[Step 24] Detect whether a charge completion signal is input from the strobe device. If no input is currently made, the process advances to step 25.

[Step 25] Determine the depth mode.

[Step 26 Determine whether this is the first depth (n=0). This is the first time for depth, so step 27
Proceed to.

[Step 27] Make the display device DISP display the depth for the first time.

[Step 28] If the photometry switch swl continues to be on, return to step 3 and perform steps 3 to 8.10.
Since the m register is set to 1 in step 11, that is, lens driving has already been performed, the process proceeds to step 29.

[Step 29] The photometric value, which is the output of the A/D conversion circuit ADZ, is taken in through the Evt-PF port.

[Step 30] The photometric value taken in step 29 is stored in the built-in memory as Evl. Thereafter, the process returns to step 3 through steps 19 to 28, and the above routine is repeated as long as the photometry switch swl is on. When the photometry switch SW1 is turned off, step 2
8, the process branches to step 31.

[Step 31] Even if the photometry switch swl is turned off, if the timer has not expired, the process returns to step 3 and branches from step 4 to step 32.

[Step 32] Determine the l register. Step 6
Since 1=1, proceed to step 33.

[Step 33] Reset the m register and l register to O.

[Step 34] Add 1 to the n register.

As a result, the n register becomes 1, indicating that the next depth is the second time.

The metering switch Swl is set to 2 when the second subject is the distance measurement target.
When turned on for the second time, the second depth operation starts. The steps up to step 14 proceed in the same manner as the first depth measurement, step 12 measures the distance to the second object, and step 13 moves the photographing lens L1 to the in-focus position. Step 1
In step 5, since this is the second depth (n=1), the process advances to step 35.

[Step 35] Defocus amount d detected by the second distance measurement and zoom encoder ENC at that time
The focal length input from step 2 is stored in the built-in memory. Thereafter, in steps 29 and 30, photometry is performed and the photometry value Evl is updated. Further, from step 26, the process proceeds to step 36.

[Step 36] Determine whether or not it is the second time of depth.

Since this is the second depth measurement, the process advances to step 37.

[Step 37] Make the display device DISP display the depth for the second time.

1111 Hikari Swee) 4- S W T -A (+ -
717# S) --! -, -/Reset the m register and l register to O by the routines 32 to 34, set the n register to 2, and wait for the third turn on of the fllll light switch swl.

When the first and second subjects are placed within the photographing screen and the photometry switch swl is turned on for the third time, the third depth operation is started. Up to step 8, the process proceeds in the same manner as in the first and second depth measurements, and at step 10, the process branches to step 38.

[Step 38] Determine the K register. Since the aperture A vdep due to depth has not yet been determined, K=
Since the answer is O, the process advances to step 39.

[Step 39] Step 16 in the first depth
The lens position stored in is read out, and the difference X between it and the current lens position, which is the second depth focusing position, is calculated.

[Step 401 If X=O1, that is, the first depth focus position and the second depth focus position are equal, any value of aperture can be used, so it is necessary to determine the aperture based on depth. There is no such thing, so step 48 hejumps. If x=0, the process proceeds to step 41.

[Step 41] If the distance of the object on the far point side is measured in the first depth measurement, and the distance of the subject on the near point side is measured in the 22nd depth measurement, the difference X will be positive, so proceed to step 42, and depth 1
If the near-point side subject is measured for the 22nd digital shot, and the far-point side subject is measured for the 22nd digital shot, the difference X becomes negative, so the process proceeds to step 43.

[Step 42] The lens movement amount and lens driving direction from the current lens position to the intermediate position C (FIG. 1(B)) are calculated by calculating XX7/17.

[Step 43] Calculate the lens movement amount and lens drive direction from the current lens position to the intermediate position 1ic by calculating XXl0/17.

[Step 44] Output the lens drive amount and lens drive direction calculated in steps 42 and 43 from the PP boat, drive the lens drive motor MT2, and drive the photographic lens L1.
is moved to intermediate position C.

[Step 45] Read the defocus amount d stored in Step 35, and calculate the aperture Avdep based on the depth using the formula: Avdep=dX (7/17)+35pm.

[Step 46] Load the photometric value.

[Step 47] The photometric value taken in step 46 is stored in the built-in memory as Ev2.

[Step 48] Since the determination of the aperture A vdep based on the depth has been completed, 1 is stored in the K register.

If zooming is performed after determining the aperture A vdep based on the depth, the depth of field changes due to a change in focal length, so the aperture A vdep must also be changed. Therefore, when it is detected in step 20 that the focal length has changed due to zooming from the focal length of the 22nd digital digital camera stored in step 35, Ama depX (current focal length) 2 ÷ (22 digital digital focal pressure #) The aperture Avdep is corrected according to the formula. If the aperture Avdep is further on the aperture side than the minimum aperture Amar on the aperture side, a warning is displayed by blinking the display DISP in step 22. In step 23, Aperture A v by depth
Since the dep determination operation is completed and K=1, the process advances to step 49.

[Step 49] Determine whether the release switch sw2 is on or off. Assuming that the release switch sw2 is now off, the process proceeds to step 36, and from there to step 50.

[Step 50] It is determined whether the photometric value selection switch swEV is selecting the average value or the latest value.

[Step 51] If the latest value is selected as the photometric value, the latest value E measured in step 46 of the third depth measurement is selected.
Store v2 in the Ev register. By using the latest value, it is possible to obtain an exposure that matches the actual composition.

[Step 52] If the average value is selected as the photometric value, the average value of the photometric values of the first and second depth measurements = (E
vO+Evl)/2 is stored in EVL/register. By using the average value, it is possible to reduce exposure failures even when there is a difference in exposure between a subject on the near point side and a subject on the far point side, for example, in the case of white and black subjects.

[Step 53] Aperture A by depth A vdep
Store in v register.

[Step 54] Calculate the shutter speed Tv from the formula Tv=Ev-Av.

[Step 55] Based on the apex values Av and Tv, the display device DISP displays the aperture in F-number units and the shutter speed in seconds.

Since K=O until the operation of determining the aperture Avdep based on the depth is not completed, even if the release switch SW2 is turned on, the process jumps from step 23 to step 49 and proceeds to step 24. As a result, the shirt release operation is prohibited until the third depth.

Since the depth becomes 1 after the third time, if the release switch sw2 is on, the process proceeds from step 49 to step 56.

[Step 56] The timer started in Step 5 is forcibly terminated even before the timer time elapses.

[Step 57] Determine whether a charging completion signal has been input. If there is no input now, the process advances to step 58.

[Steps 58 to 64] Similarly to steps 25 and 50 to 55, calculate the aperture A vdep in which both the first and second subjects enter the depth of field, and calculate the shutter speed Tv based on it, and display it. display on the device DISP.

[Step 65] From the PH boat to the D/A conversion circuit D
Output aperture Ay to AI. This allows the subtractor AMP
2 is a control circuit DR that controls the voltage corresponding to the number of aperture stages ΔAy.
Enter in AW.

[Step 66] From PJ boat to real time expansion circuit E
Outputs the shutter time Tv to XP.

[Step 67] The sequence subroutine shown in FIG. 4 is called.

[Step 68] A trigger signal is output from the PI boat to the aperture control circuit DRAY and the shutter control circuit DRTV to start the operation of both circuits. Aperture control circuit DRA
(V is a start magnet) By operating the MGI, an aperture regulating member (not shown) is driven, and the number of aperture stages ΔA is
When the aperture regulating member has narrowed the aperture by y, the stop magnet MG2 is activated to stop the aperture regulating member from driving. Thereby, the aperture is controlled to a value corresponding to A vdep. After this, the shutter control circuit DRT
V operates the leading curtain magnet MG3 to start running the leading curtain. When the front curtain is running, the real time extension circuit EXP starts timing operation, and when the time obtained by extending the shutter shutter second time Tv is counted, it sends a signal to the shutter control circuit DRTV, activates the rear curtain magnet (MG4), and Run the curtain.

This completes the exposure operation.

[Step 69: Since the charge switch swCHG is turned off upon completion of trailing curtain travel, this is determined.

[Step 70] The motor drive circuit DRI energizes the charge motor MTI to charge the shutter, diaphragm, etc., and to feed the film.

[Step 711: Detect completion of the charging operation by determining whether the charging switch swCHG is on.

[Step 72] The motor drive circuit DRI stops energizing the charge motor MTI. After this, the process returns to step 28.

When performing quick shooting in depth mode, when returning to step 28 after the first release operation, the metering switch swl and the release switch sw2 are still on, so step 28 to step 3 and does not return to step 2. Therefore, n=2. to=1
is held, jumps from step 38 to step 19, and sets the aperture A vdep and photometric value E at the first release.
vO.

Evl and Ev2 are held during continuous shooting.

In addition, not only in the case of quick shooting, but also when only the metering switch swl continues to be on after the release operation is completed, the process returns from step 28 to step 3, so that the aperture A vdep and the metering values Evo, Evl at the time of release are , Ev2
is retained. Furthermore, even if the photometry switch swl is turned on for a while and then released, the process returns from step 28 and step 31 to step 3 until the timer time elapses, so that the aperture A vdep and photometry value E at the time of release are changed.
vO.

Evl and Ev2 are held. This is because in the depth mode, it is necessary to turn on the photometry switch swl three times, which takes time to prepare for shooting, so it is desirable to be able to use as much of the once determined aperture A vdep as possible.

Note that if the photometry switch swl is turned off and the timer time has elapsed, or if the photometry switch swl is turned off immediately after the release operation, the process returns from step 31 to step 2, so that n=0. = 0, and the aperture A vdeP and photometric values EvO, Evl, Ev at the time of release.
2 will not be used for subsequent shooting.

During depth operation, if the main capacitor of the strobe device attached to the camera is fully charged and a charge completion signal is input to the FD port of the microcomputer COM, the process branches from step 7 to step 9, and the n register and Since the register is reset to O, the depth operation is canceled. This is because when photographing with a strobe, if the first and second subjects are separated by a distance gI (distance that makes you want to use depth mode), it is often not possible to obtain proper exposure for both near and far. In this case, it will automatically switch to normal mode and step 9 to step 73
Proceed to.

[Step 73] The photometric value Ev is taken in from the A/D conversion circuit ADI.

[Step 74] AF momo selection switch 5WAP
Determine the selection state of.

[Step 75] If the servo mode is selected, the distance to the subject is constantly measured.

[Step 76] If the subject moves according to the distance measurement results,
The lens follows this and always moves to the in-focus position.

[Step 77] If the one-shot mode is selected, determine the n register. a=1 indicates that the lens has been moved once to the in-focus position. In that case,
The process proceeds to step 49 without performing distance measurement or lens driving.

[Steps 78, 79] Measure the distance to the subject and move the lens to the in-focus position.

[Step 80] Store 1 in the n register.

In step 49, it is determined whether the release switch sw2 is on or off, and if it is off, it is determined in step 24 whether a charge completion signal has been input, and if there is an input, the process proceeds to step 81.

[Step 811 Reset the n register and the
Proceed to step 2.

[Step 82] According to the selected AE mode, an aperture Av and a shutter speed Tv are calculated from the photometric value Ev measured in Step 73, and are displayed on the display DISP in Step 55.

If it is determined in step 49 that the release switch sw2 is on, the process proceeds to steps 56 and 57.In step 57, it is determined whether a charging completion signal has been input, and if there is an input, step 83
Proceed to.

[Step 83] Reset the n register and the 2 register to 0, and step 84 of the non-depth mode routine.
Proceed to.

[Step 84] According to the selected AE mode, an aperture Av and a shutter speed Tv are calculated from the photometric value Ev measured in Step 73. Thereafter, display operations and release operations are performed in steps 64 to 67.

When the depth mode is selected, the m register limits the depth mode and the second lens drive to one each. Therefore, in the depth mode, the AF mode is automatically selected as the one-shot mode.

(Effects of the Invention) As explained above, according to the present invention, the mode selection means for selecting the depth-of-field priority shooting mode and the depth-of-field priority shooting mode detect the first subject using the distance measuring means. measuring the distance, moving the lens to a focusing position for the first subject by the lens driving means, storing the lens position, and measuring the distance of the second subject by the distance measuring means,
An intermediate position is calculated by storing the defocus amount and internally dividing the lens moving distance corresponding to the defocus amount at a predetermined rate, and moving the lens to the intermediate position by the lens driving means, and calculation means for calculating an aperture within which the first and second objects fall within the depth of field, lens position storage means for storing the lens position, and defocus amount storage means for storing the defocus amount. and a forced setting means for forcibly setting the automatic focus control mode to the one-shot mode in the depth-of-field priority shooting mode, so that the aperture is adjusted according to the amount of defocus between the first and second subjects. In addition, even if the automatic focus control mode is set to servo mode, it will automatically switch to one-shot mode, so the aperture can be automatically adjusted to ensure that multiple subjects are in focus. In addition, it is possible to improve consistency with the automatic focus control function.

[Brief explanation of the drawing]

FIG. 1(A) is a block diagram showing the basic configuration of an embodiment of the present invention, FIG. 1(B) is a diagram showing sequential processing of an embodiment of the present invention, and FIG. 2 is a block diagram showing the basic configuration of an embodiment of the present invention. A block diagram showing the specific configuration of the embodiment, and FIGS. 3 and 4 are flowcharts showing the operation of the microcomputer shown in FIG. 2. ■... Depth mode selection means, 2...
Calculating means, 3...AF mode selection means, 4...
... Forced setting means, 5... Distance measuring means, 6.
... Lens drive means, 7 ... Lens position storage means, 8 ... Counter means, 9 ...
・Defocus amount storage means, 10...Display means, swl...Photometering switch 2, sw2...
・・Release switch, a ・・・・ Near point side subject,
b...Far point side subject, C...Intermediate position, swDEP...Depth mode selection switch,
swAF・・・AF momo selection switch, COM
・・・・・・Microcomputer.

Claims (1)

[Claims] (1) A mode selection means for selecting a depth-of-field priority shooting mode; and a mode selection means for selecting a depth-of-field priority shooting mode; The lens is moved by the lens driving means, the lens position is memorized, the distance of the second object is measured by the distance measuring means, the defocus amount is memorized, and the lens movement distance corresponding to the defocus amount is determined. An intermediate position is calculated by internally dividing the lens at a rate of a calculation means for calculating the lens position; a lens position storage means for storing the lens position; and a defocus amount storage means for storing the defocus amount; A depth of field priority control device comprising: a force setting means for forcibly setting a depth of field;