JPS63172131A - Depth of field priority controller - Google Patents

Abstract

PURPOSE:To automatically stop depth of field priority photographing in case of strobe photographing unsuitable for the field depth-priority photographing mode by providing an operating means which calculates the aperture, a lens position storage means, a defocus extent storage means where the extent of defocus is stored, and a stopping means which stops the depth of field priority photographing mode in accordance with input of charge completion signal from a strobe device CONSTITUTION:A lens is moved to the intermediate position by a lens driving means. An operating means 2 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 5 where the lens position is stored, a defocus extent storage means 7 where the extent of defocus is stored, and a stopping means 12 which stops the depth of field priority photographing mode in accordance with input of the charge completion signal from the strobe device are provided. Consequently, the aperture corresponding to the extent of defocus between first and second objects is calculated, and the depth of field priority photographing mode is stopped at the time of completion of charging of the strobe device 11. Thus, the field depth-priority photographing is automatically stopped in case of strobe photographing unsuitable for the depth of field priority photographing mode.

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.

(Object 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 have a depth-of-field priority shooting mode. To provide a depth of field priority control device that can automatically stop depth of field priority photography in strobe photography that is unsuitable for photography.

(Features of the Invention) In order to achieve the above object, the present invention includes a mode selection means for selecting a depth-of-field priority shooting mode, and a 3I-distance means for selecting a first subject in the depth-of-field priority shooting mode. The lens is moved by the lens driving means to the in-focus position with respect to the first subject, the lens position is memorized, and the second subject is measured by the distance measuring means to determine the defocus amount. The intermediate position is calculated by internally dividing the lens movement distance corresponding to the defocus amount at a predetermined rate, and the lens is moved to the intermediate position by the lens driving means, and the lens movement distance corresponding to the defocus amount is calculated by internally dividing the lens movement distance corresponding to the defocus amount. a calculation means for calculating an aperture that allows the first and second objects to fall within the depth of field; a lens position storage means for storing the lens position; a defocus amount recording tα means for storing the defocus amount; and a strobe. and a canceling means for canceling the depth-of-field priority shooting mode upon input of a charging completion signal from the device, so that the aperture is calculated according to the amount of defocus between the first and second subjects. At the same time,
The present invention is characterized in that the depth-of-field priority shooting mode is canceled when charging of the strobe device is completed.

(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 selects a depth-of-field priority shooting (hereinafter simply referred to as depth) mode.

The depth mode is selected when you want to take pictures with multiple subjects located at different distances all in focus. When the depth mode is selected, a low level signal is transmitted from the depth mode selection means l to the OR gate G1.
The signal is sent to the arithmetic means 2 via , and if the normal mode is selected, a high level signal is sent. In the normal mode, the AE mode is set to another AE mode such as a program AE mode, an aperture priority AE mode, or a shutter priority AE mode selected by an AE mode selection means (not shown).

After selecting the depth mode, the photographer first selects the subject a on the near point side as the distance measurement target, turns on the metering switch and switch SWl with the first stroke of the shutter button (not shown), and performs the 21st digital operation. Thereby, the calculating means 2 causes the distance measuring means 3 to measure the distance of the subject a on the near point side, obtains the in-focus position, and causes the lens driving means 4 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 5, and the fact that it is the 21st digital digital camera is stored in the counter means 6.

After turning off the metering switch swl, the photographer selects the subject on the far point side as the distance measurement target, and then turns on the metering switch swl again to perform the second depth operation.
As a result, the calculating means 2 causes the distance measuring means 3 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 7, and sets the depth at the second time. A certain fact is stored in the counter means 6.

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.
Depth 3 by turning on the photometry switch swl
The calculation means 2 reads out the defocus amount stored in the defocus amount storage means 7, and calculates the lens movement distance corresponding to this defocus amount by a predetermined ratio 1, for example 7:10. The intermediate position 11c is calculated by internally dividing the position C, and the lens is moved to the intermediate position C by the lens driving means 4. At the same time, by dividing 7/17 of the defocus amount (which is the defocus amount at the intermediate position C) by the circle of least confusion 35g, m, the depth of field for both the near-point side subject a and the far-point side subject a is reduced. The aperture that falls within is calculated and displayed on display means 8. Further, the aperture determining operation based on depth is completed by operating the photometry switch swl 0 or more times to cause the counter means 6 to store that it is the third depth measurement.

The calculation means 2 may take in the J-light value from the photometry means 9 for each depth measurement, or may take in the photometry value only for the defuco measurement. The shutter speed is calculated from the calculated aperture, and the shutter speed is also displayed on the display means 8 together with the aperture.

When the photographer turns on the release switch sw2 at the same time as or after the first deflation, the calculation means 2 outputs the aperture and shutter speed to the exposure control means 10, 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 subjects between them are in focus.

During the above series of operations in depth mode, if the strobe device 11 attached to the camera completes charging of the main capacitor and sends a high-level charging completion signal to the camera, this charging completion signal will cause Since the OR gate G1 constituting the aborting means 12 of the present invention makes its output high level, the operator stage 2 aborts the depth mode and automatically switches to normal mode operation. This is because when shooting with a strobe, if the near-point subject a and the far-point subject are far enough apart (the distance that you would want to use depth mode), it is often not possible to obtain the correct exposure for both distance and distance. be. Note that when the charging completion signal is no longer input, the OR gate G1 of the canceling means 12 automatically returns the calculating means 2 to the depth mode.

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, since the depth mode is canceled when the strobe device is fully charged, depth photography can be automatically stopped when the strobe is unsuitable for the depth mode.

In Figure 1, the lens is not driven on the 22nd digital shot, but the lens may be driven on the 22nd digital shot as well.In this case, the subject is in focus on both the first and second depth shots. 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 object on the far point side in the first depth measurement, and to measure the distance to the near point object A in the 22nd depth measurement.

The predetermined ratio for internally dividing the amount of defocus is not limited to 7:10, but may be 1:1, for example.Also, to calculate the aperture, the amount of defocus at intermediate position C 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 diaphragm is calculated based on the depth at the 2nd time of the digital camera, but these may be performed at the 22nd time, that is, the photometry switch swl is operated twice. Accordingly, driving the lens to the intermediate position aC and determining the aperture based on the depth may be completed.

Although the photometry switch SW1 that is turned on by the first stroke is used, a separately provided photometry switch may be used, or an operating 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 AMP1 is an operational amplifier, which constitute a photometric means and output an open brightness Bma0 (apex value). VRl is a variable resistor for setting film sensitivity and outputs film sensitivity Sv. VH2 is the open aperture Av of the attached lens.

VH2 is the variable resistor for setting the maximum aperture, VH2 is the variable resistor for setting the minimum aperture, which sets the minimum aperture Avl (minimum aperture on the narrowing side) of the attached lens, and ADD is the variable resistor for setting the minimum aperture.
An adder that calculates o+Sv+Avo=By+5v=Ev, ADI and AD2 are A/D conversion circuits, and DAI is an aperture A output from the PH port of the microcomputer COM.
A subtracter that calculates Av=Av-Avo with y as an analog voltage, D RA V If an aperture control circuit that has a start magnet MGl and a stop magnet MG2 for aperture control and controls the aperture based on the number of aperture stages ΔAy, EX
P has a real time expansion circuit that expands the shutter speed Tv output from the PJ boat of the microcomputer COM into real time, and DRTV has a front curtain magnet MG3 and a rear curtain magnet MG4, and is output from the real time expansion circuit EXP. A shutter control circuit that controls the running of the leading and trailing curtains based on the shutter speed that is calculated, DISP is a display that displays the calculated aperture and shutter speed, and the 11th and 2nd digital times, and COM is the FA boat~ It is a microcomputer with a PP board.

swAF is an AF mode selection switch that selects the AF mode between servo mode and one-shot mode.
wEV is photometry in depth mode (photometry value selection switch that selects 4Ev as either the average value of the 11th and 2nd digital or the latest value of the 13th digital), swDEP selects either depth mode or normal mode 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, and swCHG is turned on when charging is completed and turned off when shutter travel is completed. MTI is a charge motor that drives a charging mechanism such as a shutter and a film winding mechanism, DRl is a motor drive circuit that energizes the charge motor MTI, and AFS receives a subject image incident through a photographic lens Ll. The AF sensor AFD is a focus detection circuit that calculates the defocus amount d to the in-focus position on the image plane based on the signal from the AF sensor AFS.

Each of the above-mentioned elements except the photographic lens LL 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 LL, C0DI is a code pattern plate that works together with the brush BRI to detect the position of the photographic lens LL (range ring position), and ENCl 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 operates a motor drive circuit DR2 in response to a lens drive signal and a lens drive direction signal input from the PP port of the microcomputer COM via the communication controller CC.
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 LL in the optical axis direction, and LPI is the photographic lens L1.
CNT is set by the lens drive amount signal input from the communication controller CC, and is input from the contact piece LP2. This is a displacement pulse counter that counts displacement pulses and instructs the motor control circuit CM to stop the lens drive motor MT2 when the counted value matches a set value.

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 been completed, respectively. Reset to O.

[Step 3] It is assumed that the depth mode is selected by the photographer through the selection EP of various modes, and the photometry switch swl is turned on for the first time with the first subject as the object of distance measurement.

[Step 4] The state of the photometry switch s w l is detected and is on, so 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] A1 - Set the register indicating that the optical switch swl is turned on to 1.

[Step 7] Detect whether a charging completion signal is input to the PD boat from the strobe device attached to the camera. If it is not input, proceed to step 8. If it is input, the process branches 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.

[Step 10] Determine how many times the depth is applied,
Now, since the depth is 1 [1], 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] Operate the focus detection circuit AFD,
The defocus Yd of the first subject image incident on the AF sensor AFS via the photographic lens Ll is captured through the PN boat.

[Step 13] Calculate the lens drive amount and lens drive direction from d for the defocus 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 LL 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 photographic lens Ll is moved by the amount of lens drive by the 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 set to O (whether this is the first time of depth).

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

[Step 2 16] The lens position (distance ring position) of the first depth measurement is stored in the built-in memory of the microcomputer COM.

[Step 17] Photometry f! which is the output of the A/D conversion circuit ADZ. Take in 1'iEv 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 203 This is a step to correct the aperture A vdep due to the 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 Avl on the aperture side, but since this is the first time of depth and the aperture A vdep has not been determined yet, it is passed through as is.

[Step 22] If the depth-based aperture A vdep is further on the aperture side than the minimum aperture Avl on the aperture side, the display DISP is blinked to display a warning, 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] It is detected whether a charge completion signal is input from the strobe device. Assuming that there is no manual labor at this time, proceed to step 25.

[Step 25] Determine the depth mode.

[Step 26] Determine whether it is the first time depth (n=O). 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] I optical switch swl is turned on *b
c, return to step 3, step 3-B,
As shown in Lotl-1, since the m register is set to 1 in step 11, that is, the lens drive has already been performed, the process proceeds to step 29.

[Step 29] The h-light (4Ev) which is the output of the A/D conversion circuit ADZ is taken in through the PF boat.

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

Step 31] Even if the photometry switch swl is 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 t=t, the process advances 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 photometry switch SW1 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. Up to step 14, the process proceeds in the same manner as the first depth measurement, and in step 12, the distance to the second object is measured, and in step 13, the photographing lens Ll is moved 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 ID detected by 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] The display device DISP is made to display depth 2 times 1.

■When the optical switch swl is turned off, steps 32-3
4, the m register and the l register are reset to O, the n register is set to 2, and the third turn-on of the photometry switch swl is awaited.

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=0, that is, the first depth focus position and the second depth focus position are equal, any value of aperture can be used, so determine the aperture based on depth. There is no need, so jump to step 48. If x=0, the process proceeds to step 41.

[Step 41] When the far point side subject is measured with the first depth entry, and the near point side subject is measured with the second depth entry, the difference X becomes positive, so proceed to step 42,
If the near-point side subject is measured at the second time and the distance is measured at the far point side at the depth second time, the difference X becomes negative, so the process proceeds to step 43.

[Step 42] The lens movement distance and lens driving direction from the current lens position to the intermediate position 2tc (FIG. 1(B)) are calculated by calculating XX7/17.

[Step 43] The lens moving field and lens driving direction from the current lens position to the intermediate position C are calculated by calculating XXl0/17.

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

[Step 45] Read the defocus amount d stored in Step 35, Avdep= d X (7/17) ÷ 35
Aperture A vdep based on depth is calculated using the formula Bm.

[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 will change due to the change in focal length, so the aperture A vdep must also be changed. Therefore, in step 20, the zooming When it is detected that the focal length has changed from the focal length of the second depth aperture stored in step 35, the aperture Avdep is corrected using the formula AvdepX (current focal length) 2 ÷ (focal length of the second depth aperture) 2. Aperture A vdep
If the aperture Av1 is further on the aperture side than the minimum aperture Av1 on the aperture side, a warning is displayed in step 22 by blinking the display DISP.
Since the vdeP 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 501: Determine whether the 9-light value selection switch swEV is selecting the average value or the latest value.

[Step 2 Step 51] If the latest value is selected as the photometric value, the latest value Ev2 photometrically measured in Step 46 of the third depth measurement is stored in the Ev register. By using the @new value, you can 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 for the first and second depth measurements = (E
vO+Evl)/2 is stored in EYL/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] From the formula Tv=Ev-Av, shutter second I! ? Calculate Tv.

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

Since K=O until the operation of determining the aperture A vdep 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 M+h up to the third depth opening. 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] Separate the human power of the charging chamber r signal by r1.

If there is no input now, the process advances to step 58.

[Steps 58 to 64] Similar 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, calculate the shutter speed Tv#3 based on it, Display it on the display device DISP.

[Step 65] From PH boat to 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.
Manpower for AM.

[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 DRAM and the shutter control circuit DRTV to start the operation of both circuits. Aperture control circuit DRAY
operates the start magnet MGl to drive the aperture regulating member (not shown) and to adjust the aperture stage number ΔAy.
When the aperture regulating member has narrowed down the aperture, the stop magnet MG2 is activated to stop driving the aperture regulating member. Thereby, the aperture is controlled to a value corresponding to A vdep. After this, the shutter control circuit DRTV
activates the leading curtain magnet MG3 to start the running of the leading curtain. When the leading 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 measured, it sends a signal to the shutter control circuit DRTV, activates the trailing curtain magnet MG4, and starts the time measurement operation. run. This completes the exposure operation.

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

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

[Step 71] Completion of the charging operation is detected 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, in the case of photometry, the process returns from step 28 and step 31 to step 3 until the timer time elapses, so that the aperture AvdeP and the photometry value EvO at the time of release.

Evl and Ev2 are held. This is because in the depth mode, it is necessary to turn on the metering 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 wdep 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. = O, and the aperture A vdep and photometric values EvO, Evl, E at the time of release.
v2 will not be used for subsequent shooting.

Even if you try to shoot with a flash in depth mode, if the near and far objects are far enough apart, the exposure will often not be correct for both distance and distance. You can take better photos by using other AE modes or manual mode instead of depth mode. Therefore, in FIG. 3, when a charging completion signal is input from the strobe device to the microcomputer COM during the depth operation, the depth operation is stopped. More specifically, in a strobe device attached to a camera as shown in FIG. 5, when the power switch swBT is turned on, the main capacitor C is charged with the output of the DC-DC converter DD, and the voltage reaches the charging completion level. When the comparator CP detects that the charge has been reached, the AND gate G2 sends a high-level charge completion signal to the PD port of the microcomputer COM. In FIG. 5, BT is a power supply battery, CV is a constant voltage circuit that inputs a reference voltage to comparator CP, and R1, R2.
is a voltage dividing resistor, TG is a trigger circuit, and Xe is a flash discharge tube. During depth operation, the microcomputer COM
When the FD boat receives a charge completion signal from the strobe device, steps 7 to 9 are performed in the flowchart of FIG.
The program branches to and resets the n register and the second register to O, thereby interrupting the depth operation. In this case, the normal mode is automatically entered, and the process proceeds from step 9 to step 73.

[Step 73] Load the photometric value Ev 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, two-shot mode is selected, the n register is determined. 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 and 79] Measure the distance to the subject and find the focal point t
Move Helens.

[Step 80] Store 1 in the n register.

In step 49, it is determined whether the release switch 5W2 (7) 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 81] Reset the n and 2 registers to 0, and step 8 of the non-depth mode routine.
Proceed to step 2.

[Step 82] According to the selected AE mode, the aperture Ay and shutter speed Tv are calculated from the photometry (#Ev) measured in Step 73, and the display device DISP is calculated in Step 55.
to be displayed.

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 and 2 registers to O, and step 84 of the non-depth mode routine.
Proceed to.

[Step 84] Depending on the selected AE mode
Su ÷ Yu, the 71-Itshu 1 ni side hu l old p υ ← L
l Calculate boat L1Ay, shirt time Tv. below,
In steps 64 to 67, a display operation and a release operation are performed.

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

(Effects of the Invention) As described below, according to the present invention, the mode selection stage for selecting the depth-of-field priority shooting mode and the mode selection stage for selecting the depth-of-field priority shooting mode, and the mode selection stage for selecting the depth-of-field priority shooting mode, Measuring the distance with the distance measuring means, moving the lens to a focusing position l with respect to the first object using the lens driving means, storing the lens position, and measuring the distance of the second object with the distance measuring means,
By storing the defocus amount, calculating the intermediate position by internally dividing the lens movement distance corresponding to the defocus amount at a predetermined rate, and moving the lens to the intermediate position ξ by the lens driving means, the ratio becomes +ii calculation means for calculating an aperture in which the first and second objects fall within the depth of field from the amount of defocus; lens position storage means for storing the lens position; and a device for storing the amount of defocus. The focus is provided with a memory means and a canceling means for canceling the depth of field priority shooting mode upon input of a charge completion signal from the strobe device, and thereby depending on the amount of defocus between the first and second subjects. In addition, the depth-of-field priority shooting mode is canceled when the strobe device is fully charged, so the aperture is automatically set to ensure that multiple subjects are in focus. Furthermore, depth-of-field priority photography can be automatically stopped when flash photography is unsuitable for depth-of-field priority photography mode.

[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. 3 and 4 are flowcharts showing the operation of the microcomputer shown in FIG. 2, and FIG. 5 is a circuit diagram showing a general strobe device. l... Depth mode selection means, 2...
Calculating means, 3... Distance measuring means, 4... Lens driving means, 5... Lens position storage means, 6
...Counter means. 7... Defocus amount storage means, 8...
・Display means, 11...Strobe device 2t, 12.
...Cancellation means, swl...Metering switch, sw2...Release switch, a...
・Peria point side object, b...Far point side object, C...
...Intermediate position, swDEP...Depth mode 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 subject 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, a lens position storage means for storing the lens position, a defocus amount storage means for storing the defocus amount, and a depth of field priority shooting mode by inputting a charge completion signal from the strobe device. A depth of field priority control device comprising: a canceling means for canceling the process.