JPS63172250A - Camera with focusing device - Google Patents

Abstract

PURPOSE:To always photograph both objects under respectively focused states by executing round-up processing when a calculated stop value indiates a value between the unit number of stages and the multiple of integer. CONSTITUTION:A microcomputer PRS converts a calculated stop value into a value at every unit of stages corresponding to the multiple of integer of the minimum accuracy unit of a diaphragm control mechanism, and when the stop value indicates a value between the unit of stages and the multiple of integer, executes the round-up processing and shifts the stop value to the diaphragm side. At the time of executing practical diaphragm control based upon the calculated stop value, an error is absorbed by the round-up processing and the generation of a trouble setting up a practical control stop to the open side from the calculated stop by the accuracy of the number of control stages in a diaphragm control mechanism and disabling required photographing can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a camera having an automatic focus adjustment device that allows photographing two subjects located at different positions to be in focus.

[Prior art]

When subjects A and B are located at different positions, find the intermediate position between the lens position that focuses on subject A and the lens position that focuses on subject B, and move the lens to this intermediate position. At the same time, the aperture is determined by dividing the amount of defocus between each lens position for subjects A and B by the circle of least confusion, and with this aperture, both subjects A and B are within that depth, and subject A at a different position is determined. The applicant of the present application has proposed a camera having an automatic focus adjustment device that guarantees that both .

According to this proposal, both wave objects A and B can be brought into focus with the aperture value obtained as described above, but on the other hand, the aperture value obtained with the above method is is greatly influenced by the accuracy of the defocus amount between the lens positions that are in focus for subjects A and B, and if this defocus amount itself contains an error, the calculated aperture will not be accurate either. , it becomes impossible to shoot with both wave objects A and B in focus.

On the other hand, when moving the lens to the intermediate position, move the lens to the lens position where the autofocus device focuses on subject A, calculate the defocus amount for subject B in this state, and calculate the defocus amount for subject B. The lens is moved 6 times to a position where the amount is internally divided, and the focus detection error in the focus detection operation in the defocus detection described above and the position control error in the lens drive mechanism that moves the lens to the intermediate position are the above aperture. Affects calculations.

Furthermore, even if the lens is moved exactly 6 times to the internal intermediate signal position without the above defocus amount and position control error, the diaphragm control mechanism will not be able to actually control it due to the relationship with the minimum number of aperture control stages of the diaphragm control mechanism. There will be a difference between the aperture value calculated and the aperture value calculated above, and this difference may cause the possibility that it will not be possible to obtain an aperture value that makes both wave objects fall within the a range.

That is, the accuracy of the aperture control mechanism is such that, for example, in the apex aperture control mechanism, the aperture can only be controlled to either 1 or 1-, and if the aperture is controlled to 1, the depth will be shallower than the desired depth, and the depth described above will be shallower than the desired depth. It becomes impossible to achieve the purpose of shooting.

〔the purpose〕

The present invention has been made in view of the above-mentioned matters, and it converts the calculated aperture value into a value for each stage unit that is an integral multiple of the minimum accuracy unit of the aperture control mechanism, and also converts the aperture value into a value between stages that are an integral multiple of the minimum precision unit of the aperture control mechanism. When indicated, round-up processing is performed to shift the aperture value to a value on the aperture side. During actual aperture control based on the calculated aperture value, the above-mentioned round-up processing absorbs the above-mentioned error and improves the accuracy of the control stage number of the aperture control mechanism. This prevents the actual control aperture from becoming a value on the open side than the calculated aperture, which prevents the desired photographing from being achieved.

(Embodiment) FIG. 1 is a circuit diagram showing an embodiment of a camera equipped with an autofocus device according to the present invention.

In the figure, PRS is a camera control device, for example, a one-chip microcomputer with internal ROM, RAM, and A/D conversion functions. Performs camera operations such as focus detection function and film winding/rewinding.

Microcomputer PR3 has communication signals So, S
I, 5CLK is used to communicate with peripheral circuits and lenses, and to control the operation of each circuit and lens.

So is the data signal output from PRS, ST is PRS
The data signal 5CLK input to is a synchronization signal of the signals So and Sl.

LCM is a lens communication buffer circuit, and when the camera is in operation, the lens power supply VL is applied to the lens, and the signal CLCM from the microcomputer PR3 is at a high potential level (hereinafter abbreviated as H°, and a low potential is L°). ), it serves as a buffer for communication between the camera and lens.

Microcomputer PR3 sets signal CLCM to H°
When the predetermined data is multiplied by the SO signal and sent out in synchronization with the 5CLK signal, the circuit LCM is specified and the buffered signals LCK and DCL of the 5CLK signal and the SO signal are sent to the lens through the camera-lens interface. Output to.

At the same time, the buffered signal of the signal DLC from the lens (the part surrounded by the dashed line) is output as an SI signal, and the computer PR3 manually inputs the data of the lens as an SI signal in synchronization with the 5CLK signal. .

SDR is a drive circuit for the line sensor device SNS for focus detection, and is selected when the signal C3DR from the computer PR5 is H°, and the SO.

It is controlled by the computer PR3 by the Sl and 5CLK signals.

The SNS is, for example, a pair of CCD line sensors CCD, C
This is a sensor device including CD2.

φ1. φ2 is clock CK from computer PR3
SH is a signal for transferring the charges accumulated in the line sensors CCDI and CCD2 to the transfer section, and CLR clears the accumulated charges in the line sensors CCD and CCD2. These signals are clear signals for computer P.
It is formed by a drive circuit SDR controlled by RS.

The output signal O8 of the sensor device SNS is clock φ1. φ2
Sensors CCDI and CC output in chronological order in synchronization with
There are image signals accumulated in each picture element of D2, CCDI,
Each bit is output to the CCD2, amplified by the amplifier circuit in the circuit SDR, and then manually inputted to the computer PR3 as an AO3 signal. The computer PR3 inputs the AO3 signal from the analog input terminal, synchronizes with the CK signal, and uses its internal A/D conversion function to sequentially store it at a predetermined address in the RAM after A/D conversion.

The AGC signal, which is also an output signal of the SNS, is the output signal of the device SN.
This is the output of the storage control sensor in S, and is manually input to the circuit SDR, and then sent to the sensor CCD.

It is used to control the accumulation time of CCD2.

SPC is a photometric sensor that receives light through a photographic lens, and its output 5spc is input to an analog input terminal of computer PR3, and after A/D conversion is used for automatic exposure control (AE).

DDR is a switch sense and display circuit, which is selected when the signal CDDR from the computer PR3 is "Ho", and communication control with the computer PR3 is performed by the So, Sl, and 5CLK signals. That is, the computer PR3 It changes the camera display based on the data sent from , and informs the computer PR3 of the switch status of the switch group sws, which is turned on and off in conjunction with various operating members, including the switches SW+ and SH2, which are linked to the release button. .

MDRI and MDR2 are drive circuits for film feeding and shutter charging motors MTRI and MTR2, and signals MIF, MIR, and M2F.

Execute forward/reverse rotation of the motor with M2R.

MGI and MG2 are magnets for starting the movement of the shutter front curtain and rear curtain, respectively, and are energized by the signals SMGI and 5MG2, and the amplification transistors TRI and TR2, and are connected to the computer PR3.
Shutter control is performed by.

Note that the switch sense and display circuit DDR, motor drive circuit MDRI, and MDR2° shutter control are not directly related to the present invention, so detailed explanations thereof will be omitted.

A signal DCL input to the in-lens control circuit LPRS in synchronization with the synchronization signal LCK is data of a command from the camera to the lens, and the operation of the lens in response to the command is determined in advance.

The control circuit LPR5 analyzes the manual command according to a predetermined procedure, and performs focus adjustment and aperture control operations, as well as various lens parameters from the output DLC (opening F number, focal length, coefficient of defocus amount vs. extension amount, etc.). Outputs.

The example shows an example of a single lens that is fully extended, and when a focus adjustment command is sent from the camera, a signal is sent to the focus adjustment motor LMTR according to the drive amount and direction sent at the same time. The LMF and LMR are sent out and the motor LMTR is driven to move the optical system in the optical axis direction and perform focus adjustment. The amount of movement of the optical system is controlled by the signal 5ENC from the encoder circuit ENC, and when the predetermined movement is completed, the signals LMF and LMR are set to L to brake the motor LMTR.

When an aperture control command is sent from the camera, a known stepping motor DMTR linked to the aperture mechanism is driven in accordance with the number of aperture stages sent at the same time. still,
Stepper motors can be oven controlled, so
Does not require an encoder to monitor operation.

Note that the circuit LPRS has focal length information of the lens (in the case of a zoom lens, focal length information according to the zoom state).
A memory is provided which stores the above-mentioned barometers such as, etc., at a predetermined address. Further, the circuit LPR3 is provided with a counter that counts pulses as the monitor signal 5ENC, and further counts the number of pulses corresponding to a value according to the amount of defocus when driving the lens, which will be described later. When the count value changes by a signal corresponding to the defocus amount by counting the number of pulses, that is, when the count value changed by lens driving matches the value corresponding to the defocus amount, the signals LMF and LMR are set to L. It has a control circuit that stops the motor LMTR. In addition, the circuit generates a lens stop signal when the motor control stops when the count values match, as described above, and also generates a lens stop signal before the change in the count value due to lens driving reaches a value corresponding to the amount of defocus. A signal forming circuit is further provided that detects that the driving is stopped and forms a lens drive disabling signal at this time. The lens drive failure signal is generated by determining whether or not the monitor signal 5ENC has not been generated for a predetermined period of time or longer in a state where the change in the count value does not correspond to the defocus amount. A lens drive disabling signal is generated when the lens is not generated for a predetermined period of time under various conditions.

In addition, the above display is for displaying focus and focus detection failure or NG.
A display LDE, and further a DEP, which will be described later.

It is assumed that the device has a display element such as a segment that performs DEP2 display.

The operation of the camera configured as above will be explained using FIG. 2.

When the power switch (not shown) is turned on, power is supplied to the microcomputer PR3, and the computer PR
3 executes the stored program.

FIG. 2(a) is a flowchart showing the entire flow of the above program. When execution of the stored program is started, each step is executed sequentially from step 1.

Step 1: It is determined whether it is depth mode.

This determination is made by setting the signal CDDR to H from the computer PR5, designating the circuit DDR, inputting the setting state of the mode selection switch provided in the input switch group SWS as an SI signal to the computer PR3, and inputting the setting state of the mode selection switch provided in the input switch group SWS to the computer PR3. This is done by determining the setting state.

If the mode is set to normal mode, step 2
Move to.

Step 2: Detect the state of the switch SW1, which is turned on when the shutter button is pressed in the first stage.

The state determination operation of the switch SW1 is performed in the same manner as the switch group SWS.

When the switch SW1 is on, step 3.4 is executed and then the process returns to step 1. When the switch SW1 is off, all flags are set to 0 in step 5, and step 6
After issuing a lens stop command at step 1, the process returns to step 1.

Therefore, if the mode is set to normal mode and the shutter button is not operated, steps 1 → 2 →
5 → 6 will be repeated.

Suppose now that the mode is set to Dave's mode with the shutter button not being operated.

In this case, it is detected in step 1 during the repetition of steps 1→2→5→6 that the mode has shifted to depth, so the step shifts to step 7.

Step 7: Prohibit release operation.

Step 8: Set all flags except flag DEP to 0, and set flag DEP+ to 1.

Step 9: Determine the state of the switch SW1, and if the switch SW1 is off, proceed to step 10 and subsequent steps, and if the switch SW1 is on, proceed to step 17.

Assume that switch SW1 is now off.

In this case, a lens stop command is issued in step 10,
In step 12, the setting state of the flag DEPDN is determined.

Since the flags other than the flag DEP are set to O in step 8, the process moves to step 13, and the flags DEPJF and DEPOK are set to 0. In step 14, the setting mode is determined again, and the mode remains in Dave's mode. If it is held, the process goes to step 15, and if Dave Smoot is released, the process goes to step 16. In step 15, it is determined whether the elapsed time of the internal timer exceeds a predetermined value. It is assumed that this timer starts its timekeeping operation after the Dave's mode is set.

If the time measured by the timer has not exceeded the predetermined time, the process goes to step 9 again, and if the time has exceeded the predetermined time, the process goes to step 16.

Unless the predetermined time has elapsed after the depth mode is set in steps 9 to 16 above, steps 9 to 16
Step 15 is repeated, and if the switch SW1 is turned on within this predetermined time, the step moves to step 17. If the switch SW1 is not turned on within the predetermined time, or if the depth mode is canceled, the process proceeds to step 16, where all flags are set to O, and the process returns to step 1 again.

Therefore, even if the depth mode is set once, if the shutter button is not operated within a predetermined time, the depth mode is canceled and the mode returns to the normal mode.

Assume that the shutter button is pressed in the first step within a predetermined time after the Dave's mode is set.

In this case, as described above, the process moves to step 17 and the photometry subroutine is executed.

In this photometry subroutine, the output 5spc of the photometry sensor SPC that measures light through the photographic lens is sent to the computer P.
The signal is input to R3, digitized by the internal A/D conversion function, and the digital value is stored in memory.

After the photometry subroutine is performed, the process moves to steps 18 and subsequent steps.

Step 182: Reset the above-mentioned timer and restart the timing operation from the initial state.

Step 19: Detect the set state of flag DEPJF.

Now, in step 8, flags other than the flag DEP are set to 0, so the process moves to step 20.

The AF control subroutine of step 20 is shown in FIG. 2(b).
It is described after step 100.

The first operation of the AF control subroutine under Dave's mode will be described below.

Step 200: Detect the set state of flag PRMV. Since this flag is also set to O, the process moves to step 201.

Step 201: Detect the set state of the flag DEPMV. This flag is also set to O, and the step moves to 204, where it is determined whether the mode is Dave's mode or not. Since the current mode is Dave's mode as described above, the step moves to 205.

Step 205: Detect the set state of the flag DEP. Since the flag DEP was set to 1 in step 8, the step moves to 206.

Step 206 is a focus detection subroutine, which is described after step 300 shown in FIG. 2(c). Next, the subroutine will be described.

Step 300: Execute the image signal manual subroutine.

In the image signal input subroutine, first the computer PR
3, set C3DR to H, select drive circuit SDR, and set S
The flaw signal is transmitted to the drive circuit SDR. This is the SO flaw signal accumulation start command at this time, and in response to this command, the drive circuit SD
R transmits the CLR signal to the line sensor device SNS and the CCD
The image accumulation signal of the line sensor is cleared, and then an accumulation operation is performed on the image. CC of line sensor device SNS
Image light beams entering the D-line sensors CCDI and CCD2 through the photographic lenses are respectively incident, and the image position on each sensor CCD and CCD2 is determined according to the focal state.

To explain in detail, when the subject is in focus, each sensor CC
The same image pattern is projected at the same position on D and CCD 2, and in the front bin or rear bin state, the image pattern on CCD and CCD 2 is projected at a symmetrically shifted position depending on the direction and amount of focus shift. be done. Therefore, the above CCDI
By detecting the amount and direction of positional deviation between the image pattern on the CCD 2 and the image pattern on the CCD 2, the direction and amount of out-of-focus are detected.

After clearing the image signal, the image pattern projected at a position according to the focus state as described above is accumulated in each CCDI and CCD2 for a predetermined time, and then a signal S is sent from the drive circuit SDR.
H and clock φ1. φ2 is supplied to the sensor device SNS.

Note that the accumulation time of the image pattern is determined based on the output AGC of the accumulation control sensor within the SNS.

As described above, the signal SH and the clock φ1. When φ2 is supplied, each sensor CCD+ is output from the sensor device SNS and the output end.

The image signals accumulated in each picture element of the CCD 2 are sequentially sent out in time series as an output OS, amplified by an amplification circuit in the drive circuit SDR, and sequentially input to the computer PR5 as a signal AOS. The computer PRS sequentially converts the signal AOS into digital values using an internal A/D conversion function and stores them in a predetermined RAM.

With the above operation, the image signal or digital value of each sensor according to the image pattern on the sensor CCD, CCD2 is
The image signal input subroutine is stored in AM and the process moves to step 301.

Step 301: Execute the defocus amount calculation subroutine. In this subroutine, the amount and direction of deviation up to in-focus are calculated as the defocus amount DEF based on the digital values corresponding to the image pattern on the sensor CCD and CCD 2 obtained in the image signal input subroutine.

Since the specific method of calculating the defocus amount is not directly related to the present application, a detailed explanation thereof will be omitted, but as mentioned above, the degree of coincidence between the image patterns of the sensor CCD and CCD 2 is determined by the focus state. The digital values of the respective sensors corresponding to the pattern are compared and processed, and the degree of coincidence of the data is determined to determine the amount and direction of deviation from the in-focus state, that is, the defocus amount DEF.

Also, in this subroutine, the sensor CCD.

The contrast CNT is also determined from the digital value corresponding to the image pattern of the CCD 2, and this contrast detection is also known. A detailed explanation thereof will be omitted.

Step 302: Set flags JF and AFNG to 0.

Step 303: Contrast CNT and constant value LCLV
When CNT<LCLVC, that is, when the contrast is low, the flag AFNG is set to 1 in step 304, the focus detection subroutine is ended, and the process proceeds to step 207.

Further, when CNT>LCLVC, that is, when the contrast is sufficient, the process moves to step 305, and the calculated defocus amount DEF is a constant defocus amount JF that can be regarded as in-focus.
It is determined whether or not it is within FLD, and DEF<JFFLD
In this case, the flag JF is set to 1 in step 306, the focus detection subroutine is ended, and the process proceeds to step 207. Further, when the above judgment shows that DEF>JFFLD, the focus detection subroutine is ended without setting the flag JF to 1, and the process proceeds to step 207.

In the above focus detection subroutine, the flag AFNG is set to 1 when the contrast is low, and the flag JF is set to 1 when the contrast is sufficient and the amount of defocus is considered to be in focus, and the flag JF is set to 1 when the amount of defocus is considered to be in focus. If it is a dog in a range that can be considered to be hot, return without setting flag JF to 1.

After the focus state is detected and determined in the focus detection subroutine, a flow routine to be displayed in step 207 is executed. When flag AFNG is set to 1 in the word display blue routine, computer PR3 specifies CDDR without signal, circuit DDR is specified, and SO
The display signal as a flaw signal is transmitted to the circuit DDR, and the display device DS
The LED provided at P for indicating that focus cannot be detected is turned on. Further, when the flag JF is set to 1, the focus display LED is lit in the same manner.

After the focus state is displayed in the display blue routine, the step moves to 208.

Step 208: Determine the set state of flag JF.

Step 2 when flag JF is set to 1
At 09, the set state of the flag DEP is determined.

Since D E P 1 is now set to 1, the program executes step 210, sets the flag DEPJF to 1, returns, and moves to step 9 again.

Further, when the flag JF is O, the set state of the flag AFNG is determined in step 211, and when AFNG is set to 1, the process returns to step 9 again.

Further, when flags JF and AFNG are both 0, steps after step 212 are executed.

Step 212: Lens drive amount calculation subroutine (F
This is called the P calculation subroutine. )Execute. This subroutine is described after step 400 shown in FIG. 2(d).

Step 400: Manually calculate "coefficient S of defocus amount vs. projection amount" from the lens. This manual operation sets the signal CLCM to H in the computer PR3, designates the circuit LCM, and designates the circuit LPR3 in the lens via the circuit LCM.

Further, the signal SD is transmitted to the circuit LPRS as DCL via the circuit LCM. The signal SO at this time is a command to read the coefficient S, and the circuit LPR3 transmits the coefficient S stored in the internal RAM as a signal DLC to the circuit LCM by the signal SO, and the circuit LCM transmits the signal DLC to the SI. Other signals are input manually to the computer PRS, and the coefficient S
is entered into the computer.

Step 401: Manually input the amount of output PTMJ per encoder pulse from the lens. The input operation of the PTH is performed in the same manner as the above coefficient S.

Step 402: Calculation D of the coefficient S and PTH input in each read operation above and the calculated defocus amount DEF
Perform EF*S/FPH.

As mentioned above, FPH is the amount of output per encoder pulse, and the encoder ENC is composed of, for example, a pulse plate that detects the amount of movement of the lens LNS and outputs one pulse for each unit of movement. ing.

Further, the coefficient S is a coefficient of the amount of defocus versus the amount of projection,
DEF*S indicates the amount of protrusion depending on the amount of defocus, that is, the amount of movement of the lens depending on the amount of defocus. Therefore,
DEF*S/FPH indicates the number of pulses from the encoder ENC according to the amount of defocus, and by moving the lens by the number of pulses FP, the lens is driven by the amount of the calculated defocus. .

After determining the number of pulses FP according to the defocus amount in the FP calculation subroutine, the process moves to step 213.

In step 213, a lens drive subroutine is executed. In this subroutine, C
The LCM signal is set to H, and the circuit L P R is set as above.
' S is specified and the number of pulses FP is transmitted to the circuit LPR3 as a signal SO. In circuit LPR3, the above FP
Accordingly, the signal LMF or LMR is set to H, and the motor L
Drive MTR.

Note that the above FP is determined according to the amount of defocus, and also includes information on the direction of deviation until focusing, that is, the driving direction of the lens, and depending on this driving direction information, the signal LMF or L M Rh<H is set and the lens is driven in the focusing direction.

After starting to drive the lens in step 213, the step moves to 214, sets the flag PRMV to 1, ends the AF subroutine, and returns to step 9.

Now, when the above-mentioned focus judgment is made in the above-mentioned first AF control subroutine when the switch SWl is turned on for the first time in the daisy mode, the process returns to step 9 after the focus is displayed as described above. . If switch SW1 is kept on in this state, step 1 is performed again.
In step 7, a photometry subroutine is performed, and in step 18, the timer is reset, and in step 19, it is determined whether the flag DEPJF is set.

At this time, since the flag DEPJF is set to 1, the step moves to 21 and the set state of the flag DEPOK is determined. Since the flag DEPOK is set to O in the initial state, the process proceeds to step 22 and subsequent steps.

Therefore, when the focus is suddenly determined in the AF control subroutine during the initial ON operation of the depth mode switch SW1, the focus display is displayed and then step 2 is performed.
Move to 2.

Also, if it is determined that focus cannot be detected when the switch SW1 is turned on for the first time in the depth mode, steps 9→17 are performed.
→18 →19 →20 are repeatedly executed as long as the switch SW1 is on, and the focus detection operation is repeated.

Furthermore, even if a lens drive instruction is given based on the amount of defocus until focusing in the AF control subroutine when the switch SW is turned on for the first time in depth mode, the switch SW is turned on after the first AF control subroutine is executed. If it is kept on, repeat steps 9 → 17 → 18 → 19 →
20 is repeated. In the AF control subroutine at step 20 during the repetition of the above steps, since 1 is detected in the flag PRMV detection at step 200, step 202 is executed and it is determined whether the lens has stopped.

The operation for determining whether the lens has stopped will be described.

In this embodiment, when driving the lens, the number of pulses FP representing the amount of movement of the lens is input to the circuit LPRS as described above,
In addition, pulses are sent from the encoder ENC according to the heart movement of the lens LMS, and the number of pulses from the encoder is counted by a counter in the circuit LPR3. When the number of pulses matches the input pulse number FP, the circuit LPR3 outputs the signal L.
Control is performed by setting MF and LMR to L and stopping motor LHTR.

It is assumed that the pulses from the encoder are counted up or down depending on the driving direction of the lens. Since lens drive control is performed in this way, the circuit LPR3 can determine that the number of input pulses FP and the pulses from the encoder match, and that the motor Ll (TR) has been stopped. A lens stop signal is generated when the lens drive control described above is not performed.

Therefore, the computer PR5 connects the circuit L as described above.
By specifying PR5 and reading this lens stop signal, it is determined in step 202 whether or not the lens has stopped.

If the lens hits the infinite end position and stops during lens driving, the number of pulses from the encoder ENC counted by the counter will be the number of pulses F.
P does not match, and the lens comes to a halt. Therefore, in such a case, even if the counter and the number of pulses FP do not match, the encoder ENC will not generate pulses, and the circuit LPRS will not generate pulses from the encoder ENC for more than a predetermined time under the above conditions. When it detects that the lens is not being driven, the signals LMF and LMR are set to L, the motor is stopped, and a lens drive disabling signal is generated, which is stored in the internal RAM of the circuit. This is used to determine whether the lens has stopped.

If the lens stop signal cannot be detected in step 202, that is, if it is determined that the lens is still being driven, the AF control subroutine is immediately terminated and the process returns to step 9.

Therefore, while the lens is being driven in accordance with the defocus amount, steps 9→17→18→19→2 degrees (200→202) are repeated as the above-mentioned repeating steps.

In the process of lens driving as described above, the lens driving amount, that is, the number of pulses from the encoder ENC is the number of pulses FP calculated in the above FP calculation subroutine.
When they match, the outputs LMF and LMR are set to L in the circuit LPR3 which detects the coincidence of these pulse numbers, the motor LMTR is stopped, and the lens is driven by the defocus amount. Therefore, if the lens is driven by the amount of defocus while repeating the above steps, it is determined in step 202 that the lens has stopped, so the flag PRMV is set to 0 in step 203, and from then on, in step 204 in the same manner as described above. →205→206 are executed.

At this time, since the lens has been driven by the amount of defocus as described above, when the focus detection operation is performed in step 206, it is determined that the focus is in focus, and henceforth step 2
Transition from 08 → 209 → 210.

Therefore, when the lens is driven by turning on the switch SWl for the first time in depth mode, the lens moves until it is in focus on the subject, and once it is in focus, the above focus judgment is made. Step 2 in the same way as the operation
Move to 2 and 3.

Furthermore, since the AF control subroutine described above is repeated even when the focus cannot be detected, when the focus is no longer detected, the lens is driven to the in-focus position, and the process then proceeds to step 22.

To summarize the dibs processing operation when the switch sw1 is turned on for the first time in dibs mode, the subject is once brought into focus and then the process moves to step 22.

After bringing the subject into focus as described above, the process moves to step 22, where the flag DEP,
The set state of is determined.

Since the flag DEP has been set to 1 as described above, the process moves to step 23.

Step 23: Perform DEP and display.

This display is displayed when the signal CDDR is set to H on the computer PR3.
, specify the circuit DDR, and DEP as a signal multiplied by sO.
, the display signal is transmitted to the circuit DDR, and the circuit DDR causes the DEP and display to be performed in the segment in the display device DSP. This will notify the photographer that the first dibs process has been completed.

After this, the step moves to 24, and the flag DEP is set to 0.
is set, and DEP2 is set to 1. Thereafter, in step 25, the flag DEPOK is set to 1, and the process returns to step 9.

After this, if the switch SWl is kept on, the steps proceed from 17 to 18 to 19 to 21. At this time, the flag DEPOK has been set to 1 in step 25, so after step 21, the process returns to step 9. After the first dibs process is completed, steps 9→17→18→19→21 are repeated as long as the switch sw1 is on, and the lens continues to be held at the initially focused position. When the shutter button is released from this state and the switch sw1 is turned off, steps 9→17→18
→19→21 The steps change to 12 and onwards. In the processing after step 12, as described above, the flags DEPJF and DEPOK are set to O, and the mode is held at deep, or after the first deep processing is completed, the switch SW is turned on.

It is determined whether a predetermined time has elapsed since the switch was turned off, and if the mode is returned to the normal mode or if the switch sw1 remains off until the predetermined time elapses, the process proceeds to step 1 via step 16. Returns and Dibsmote is canceled.

If the mode is held in dibs and the release button is operated again within the above-mentioned time and the switch SW1 is turned on, the step shifts to step 17 again and the second dibs process is started.

The second dibs process will be explained below.

As described above, the process moves to step 17, where the photometry subroutine is executed, and at step 18, the timer is reset to restart time measurement, and the process moves to step 19. At this point, since the flag DEPJF has been set to 0 in step 13 while the switch SW1 is off, the AF control subroutine of step 20 is executed following step 19.

In the AF subroutine, step 200 is performed as described above.

At this point, the flag PRMV is set to 0, and the step moves from 200 to 201. At this time, since the flag DEPMV is also set to O, the step moves to 204, where it is determined whether the mote is dibs, and since the mode is currently set to dabs, the step moves to 205. Before the start of the second dibs process, the flag DEP is set to 0 in step 24 as described above.
is set, the step moves to 215.

Step 215: Determine whether the flag DEP2 is set. At this time, since the flag DEP was set to 1 in step 24, the step moves to step 216 in FIG.゛inch S
The focus state for the subject at the time when W1 is turned on is determined.

When the flag AFNG is set to 1 as a result of this focus state determination, that is, when the contrast is low and focus cannot be detected, this is detected in step 217 and the process moves to step 218.

Step 218: Execute the NG display blue routine. In this subroutine, the AF control subroutine is ended after the LED for indicating that focus detection is not possible is turned on in the same manner as the display routine described above.

Further, if the flag AFNG is not set to 1 in the focus detection subroutine in step 216, that is, if it is determined that there is sufficient contrast, step 217 is performed.
Next, the process advances to step 219.

Step 219: It is determined whether the defocus amount DEF obtained in the focus detection subroutine is larger than a constant value dc. If the result of this determination is IDEFl>dC, the process goes to step 218 for 8 lines, a focus detection failure display is displayed, and the AF control subroutine is ended.

Therefore, in the second dibs process, when it is detected that the contrast is low or that the defocus amount is dog, the AF control subroutine is immediately terminated and the process returns to step 9.

If the switch SW1 is kept on in this state, the steps will shift again from 9 to 17 to 18-19-20, and this step will be repeated until the above focus detection result becomes different. The detection subroutine checks that the contrast is sufficiently high and the amount of defocus is lD
If it is determined that EF 1 < d c, the process moves to step 220 .

Incidentally, when it is determined that the focus detection result at the first step 216 has sufficient contrast and IDEFI<dc, the process immediately moves to step 220 without repeating the above focus detection operation.

In the second depth processing, the reason why the depth processing does not proceed when the defocus amount is more than a predetermined value is when the subject in the first Daves processing and the subject in the second processing are extremely far apart. This is because the depth processing itself, which brings both wave objects into focus, is not performed with high precision, and processing in Dave's mode is virtually impossible.

When the process moves to step 220 as described above, step 2
At 20, lens focal length information is input into the memory LSTFL.

The computer P inputs this focal length information.
The signal CLCM is set to H at R5, and the circuit LC is activated as described above.
This is executed by specifying the circuit LPR3 via M and reading the focal length information stored in the circuit.

Note that if the lens is a zoom lens, focal length information corresponding to its set zoom state will be read out.

After reading the focal length information in step 220 in this manner, the process moves to step 221.

Step 221. From the calculated defocus amount, an aperture value that brings both wave objects into focus when the first and second Dave's processing is performed is determined.

That is, as shown in Fig. 3, if the lens can be brought into focus when the lens is positioned at DEP for subject A in the first Dave's processing, then the lens will be at DEP, DEP in the first depth processing. The location is heo multi-line.

In this state, when the second Dave's process is performed on subject B, which will be in focus when the lens is moved to the DEP2 position, the lens will be defocused from the lens position DEP for subject B during the second depth process. DEF is detected in the focus detection operation, and this amount of defocus becomes the amount of defocus between lens positions DEP and DEP2.

As described above, depth processing in the present invention is performed at a position DE where the amount of defocus between two different subjects is internally divided into □ on the nearest side.
Move the lens 8 to P3 and at this position, DEP3 and DE
The value divided by the defocus mm between P2 is used as the control aperture.

To explain in detail, the lens is generally DEP as described above.

When the camera is positioned at
If there is a subject B that will be in focus when positioned at 2,
Position DEP, and position DEP3 that internally divides DEP2
Shift the lens to DEP
By dividing the defocus amount DFF' between , and the original focus position DEP or DEP2 for one subject by the circle of least confusion, the lens can be set at the original position DEP and DEP2 while keeping the lens at DEP3. It is possible to obtain an aperture value that satisfies the depth of field that brings both the two objects A and B into focus.

Therefore, in this application, using this principle, in the above calculation, l
o EFIX-X□, 170.
035 We are looking for an aperture that brings the closest object DEP2 into sufficient focus when the lens is shifted to DEP3. In addition, the aperture at this time is at the infinity side position D E P
+ is not covered within the depth range, but considering the characteristics of normal lenses, objects on the infinity side will be fully in focus even if the above depth does not originally cover it. In this application, the internal division point (DEP3) is set at the position of □ on the nearest side.

In this way, the aperture value 1DEFlx-x- 170,035 that brings both wave objects into focus is determined in step 221, and this is stored in the memory LSTFNO.
The process moves to step 222.

Step 222: It is determined whether flag JF is set to 1 as a result of the focus detection subroutine in step 216 above.

As a result, if flag JF is set to 1, the process moves to step 223 and flags DEPJF, DEP,
JP is set to 1 and the AF control subroutine is ended.

In step 1 blocks 222 and 223, the object for which flag JF is set to 1 is detected in the second depth processing is the object that is at almost the same position as the object in the first depth processing. In this case,
In other cases, the process moves to step 223.

It is now assumed that the subject positions in the first and second shots are different, and the process moves to step 223.

This step 223 executes the EP calculation subroutine, whereby the number of pulses FP corresponding to the amount of defocus up to the subject in the second depth processing is determined, and the process moves to steps 224 and subsequent steps.

Step 224. Set flag DEPMV to 1.

Step 225: Manually input a count value FCNT representing the current position of the lens.

As mentioned above, pulses representing the lens drive amount from the encoder ENC are input to the circuit LPRS, and when controlling the lens drive, these pulses are counted and matched with the pulse number FP according to the defocus amount as described above. We are detecting whether or not it has been done. Therefore, the pulses from the encoder ENC are counted by the circuit LPR5,
This count value is sent to the computer PR3 as a count value FCN representing the current lens position.
Man-powered as T.

Further, the above count value of this circuit LPR3 is specified by the above operation by setting the signal CLCM to H in the computer PR3, and at this time, the above count value is requested by the SD multiplication signal, and the above count value is requested. value is signal SI
It is manually operated by a computer.

Step 226: Based on the defocus amount, the lens is driven in the focusing direction in the same manner as in the lens driving subroutine described above. That is, the lens is driven by the amount of defocus determined in the second depth process from the lens position in the first depth process.

Step 227; The number of pulses FP corresponding to the defocus amount obtained in step 223 is stored in the memory DE.
Manpower PFP.

Step 228: Add the current count value FCNT of the lens manually inputted before lens driving and the number of pulses FP corresponding to the defocus amount inputted to the memory, and manually input it to the memory 5TLPO3.

With this, the position information for the lens to be moved 8 times is set in the memory 5TLPOS.

That is, as shown in Fig. 3, the lens is at the position DEP during the first Dave's IA operation, and the count value at this time is N!
Suppose it was. If the subject in the second depth processing can be brought into focus by moving the lens to position DEP2 in the second depth processing, the lens from DEP to DEP2 Drive J
It is assumed that iFP is determined in step 223 above, and that N2 is obtained as the number of pulses FP.

In this case, N2+N is stored in the memory 5TLPO3. These values N, +N2 are the counter value N1 when the lens is at DEPI, and the lens is at DEP.
It shows the count value at the time of transition from to DEP2, and is the count value at the target position where the lens should move eight times.

The above step 228 ends the execution number AF control subroutine and returns to step 9.

If the switch SW1 is kept on in this state, steps 17, 18 and 19 are performed following step 9. At this time, assuming that the focus judgment has not been made in the AF control subroutine during the second concave digit processing, step 2 is performed.
0, and the AF control subroutine is executed again.

In this AF control subroutine again, the flag PRMV is set to 0, and the flag DEPMV is set to 1 in step 224 of the previous AF control subroutine, so the steps are 200 → 201 → 2.
29, it is determined whether the lens has stopped or not in the same manner as step 202 described above, and if the lens has not stopped, the process returns.

Therefore, unless the lens is stopped, step 9 above
→17→18→19→20 (200→201→229)
is repeated to confirm whether the lens has stopped, and the step moves to 230.

Step 230: This step is the same as step 225 above, and the count value FCNT in the state where the lens is stopped after the second dibs process is input.

Therefore, step 223 in the second depth processing is now performed.
If the number of pulses FP found in is N2, the lens will normally be driven until N2 pulses are sent from the encoder ENC, so the count value in this state is the first time before the lens is driven. If the count value of the counter at the lens position fiD E P + (FIG. 3) at the end of the depth processing is N1, it becomes N, +N2.

After this step, the step moves to 231.

Step 231 Memory 5T found in step 228
The count value representing the current lens position obtained in step 230 is subtracted from the value stored in LPO3. As mentioned above, the value of the memory 5TLPO3 represents the scheduled lens position when driving the lens by the defocus amount obtained in the second Daves process after the first Dibs process, and The count value at the end is N1, and when the pulse corresponding to the amount of defocus from that position is N2, it is N, 10N2. Therefore, the subtraction result becomes zero when the lens is driven by the defocus amount.

Step 232: Detect the lens drive failure signal. This detection operation is performed in the same manner as the lens stop signal detection operation described above.

Now, if it is determined in step 232 that the lens is not stopped because it cannot be driven, then the step moves to 233.

Step 233: It is determined whether the absolute value of the calculation result obtained in step 231 is 4 or more. As mentioned above, if the lens is driven by the defocus amount determined in the second Daves process, the calculation result in step 231 will be zero, but if the lens is not driven by the defocus amount, or if the lens is not driven by the defocus amount. If the lens overruns due to inertia, etc. even if the motor stops after driving for a minute,
The smaller the drive amount is than the planned amount, or the larger the overrun amount, the larger the above calculation result becomes.

Therefore, in this step, when the above calculation result is 4 or less, it is assumed that the lens has been driven by the defocus amount and has been driven to the scheduled lens position determined in step 228, and the flag DEPMv is set in steps 234 and 235. o
and sets DEPJF to 1 and ends the AF control subroutine.

Further, in step 233, if the calculation result in step 231 is 4 or more, it is assumed that the lens drive has not yet moved to the scheduled lens position, and step 236
The lens drive instruction is issued again at , and after driving the lens, the process returns to end the AF control subroutine.

Now, in step 233, it is determined that the lens has not been driven to the expected lens position, and step 2
It is assumed that after the lens is driven again in step 36, the AF control subroutine ends and the process moves to step 9.

At this time, if switch SW1 is kept in the on state, steps 17→18→19→20 (200→
Steps 201→229) are executed until the lens stops, and when the lens stops, the steps 230→231→
232→233 is executed again. Therefore, as a result of re-driving, in step 233, the calculation result in step 231 is 4.
If it is determined that the lens has moved to the scheduled position determined in step 228, step 234
, 235 are executed, and in other cases, the above operations are repeatedly executed until it is determined in step 233 that the lens has moved eight times to the expected position determined in step 228. Therefore, these steps 200→201→
229→230→231→232→233→236, it is guaranteed that the lens will be reliably moved to the scheduled lens shift position determined in the second depth process. The above operation is an operation when it is determined in step 232 that the lens is not in a drive-incapable state, but in step 232, the lens moves to a limit position such as an infinite position, and the lens drive becomes disabled. If it is determined that , step 232 is followed by step 23
7 is executed.

Step 237: In this step, it is determined whether the lens has hit the infinite end position and the lens cannot be driven.

The above judgment method is based on the defocus amount DE as described above.
Since F also includes lens driving direction information, DEF
The number of pulses FP calculated based on is also given a positive or negative sign as information representing the driving direction, and by detecting this sign in this step, it can be determined whether the lens is being driven toward infinity. We are making a determination as to whether or not.

In this step, when the lens becomes unable to be driven while being driven in the infinity direction, when it is determined that the lens immediately hits the infinity end and stops, the step moves to 234, and from then on the above lens driving is performed correctly. It is treated as if

Further, when it is determined in step 237 that the lens driving direction is on the close side, that is, when it is determined that the lens is stopped at the close end, the flag DEP is set in step 238.
, 1 to DEF2°DEF3. After setting DEPDN to 0 and displaying NG on the display DSP in step 239, the AF subroutine is ended.

Therefore, if the lens hits the close end when driving the lens during the second Daves process and the lens cannot be driven, that is, if the desired image cannot be taken even after Daves process, further Daves process is necessary. Do not do the above NG
The display informs the photographer that Daves processing is not possible and instructs the photographer to restart Daves processing from the beginning.

The reason why it is assumed that the lens is driven normally in the second depth processing when the lens is stopped at the infinity end is that there is no infinite state beyond the infinity end for the lens, and Daves processing Even if you cancel Daves processing and redo Daves processing again, no further improvement can be expected. This is to allow the subsequent Daves processing to continue.

Furthermore, when driving the lens in the second Dave's process, the reason why the lens is controlled by servo (close loop) to the scheduled position is that in the Dave's mode of this application, the lens determined in the second Dave's process After moving to the position, from this position, the position where the defocus amount obtained by the second Dave's process is internally divided into □ or □ is calculated, and the process is performed to move the lens to the above internally divided position 2 This is because the lens position in the second Dave's process must be accurately driven by the above defocus amount.

Also, since the lens is servo-controlled in the second Daves process, even if the switch SWl is turned off while the lens is being driven in the second Daves process, the lens will always be moved to the correct lens position. I can do it. That is, 2
Switch S while driving the lens in the second dibs process.
When WI is turned off, the step shifts from 9 to 10, and the lens stops at that point. Also, after this switch SW1
Steps 9 to 15 are repeated while switch is off, and when switch SW1 is turned on again, steps are 7-17-18-1.
Move to 9-20.

At this time, the flag DEPMV is kept set to 1, so when the switch SW1 is turned on again, the process moves to step 20, and when the AF system control subroutine is executed, the process moves to steps 200-201→229→230. The process described above is restarted. It is assumed that the lens stop signal is also generated when the lens is stopped by the lens stop command in step 10. Therefore, after the switch SW1 is turned on again, the process proceeds to step 230, and in this step, a count value representing the lens position (SW, lens stop position when off) is manually entered as FCNT, and that position and step 228 are calculated. The lens is driven as described above by the difference from the scheduled position. Therefore, even if switch SW1 is accidentally turned off while the lens is being moved during the second depth process, if switch SW1 is turned on again, the lens driving process to the scheduled position will be restarted, and the lens will always move to the correct lens position. It happens.

When the lens moves to the scheduled position through the above operations, steps 234 and 235 are performed as described above, the AF subroutine is ended, and the process moves to step 9.

In this state, if the switch SW1 is on, the steps are 8 lines from 9 to 17 to 18 to 19.

At this time, since the flag DEPJF is set to 1 in step 235, the step proceeds from 19 to 21, and since the flag DEPOK is set to 0 at this time, the step proceeds from 21 to 22. Also, at this time, the flags DEP and DEP2 are set to DEP,=0. Since DEP2 is set to 1, the steps are 22 → 26 → 27 →
28, the display device DSP displays DEP2 indicating that the second Daves process has been completed, and the flag DE
Set P2 to 0 and DEP3 to 1, step 25
Set flag DEPOK to 1 at step 9 again.
Move to.

If the switch SW1 is kept on in this state, steps 9 → 17 → 18 → 19 → 21 → 9 will be repeated, and the lens will be held at the position found in the second dibs process. With the above, the second Daves process is completed.

Thereafter, when the switch SW1 is turned off and then turned on again, the steps shift from 9 to 17 to 18 to 19. At this time, since the switch SWl is turned off as described above, the process in step 13 is performed, and the flag DEDJF is set.

-DEDOK is set to 0. Therefore, the process moves to step 19-20, and the AF control subroutine is executed again.

Incidentally, at this point, the flag DE is set in step 234 above.
Since PMV is set to 0, the AF control subroutine moves to steps 200-201-204-205, and in step 24.28, the flag DEP,
=0°DEP2=0. Since DEP3=1 is set, the process moves from step 205 to step 240 after step 205, and step 240 is executed.

Step 240; Determine the state of flag DEP2JF. This flag is set to 1 only when step 223 is executed during the second depth processing, that is, when the subject is at approximately the same position during the first and second depth processing.

Therefore, if the first and second Dave's processes have been performed on subjects at different positions, the process moves to step 241.

It is assumed that the step has now moved to 241.

Step 241; At step 227, the memory DEPP is
The number of pulses FP manually applied to P, that is, the number of pulses corresponding to the defocus amount to the lens transition position obtained during the second digitization process, and the number of pulses when the lens is driven to the planned position in steps 233 to 235 above. Subtraction is performed with the number of pulses determined in step 231. That is, for example, as shown in FIG. 3, if the count value representing the lens position DEPI during the first digit processing is N1, and the number of pulses FP corresponding to the defocus amount during the second digit processing is N2, then
The count value representing the lens transition position DEP2 scheduled for the second Dave's process determined in step 228 is N, +N2.

In addition, in steps 230 to 236, as described above, the lens is driven until the scheduled lens position and the current position of the lens are within 4 pulses, so the count value representing the actual lens position DEP2 in the second depth processing is As shown in FIG. 4, <Nr +N2±α, 4≧α≧−4, and there is an error within ±α from the planned lens position.

Then, in step 231 above, the planned position (Nl +N
2') - lens transition position (N, +N.

α) is performed, and this ±α is calculated.

Therefore, in this step 241, the number of pulses N2 corresponding to the defocus amount obtained in the first Dave's process is subtracted from the above ±α, so the second time is calculated from the lens position DEPI after the first Dave's process. Actual lens movement amount N2± between the actual lens position after Daves processing
α is determined, and this is manually entered into memory 〇EP2FP.

Since the distance between the actual lens positions DEP and DEP2 is determined in this way, even when the lens is stopped at the infinite end as described above, the actual lens position DEP +
This makes it possible to detect the amount of movement between DEP2 and DEP2.

After the amount of movement of the lens position of DEP and DEP2 is determined in step 241, the DEP determined in the second depth processing is determined in step 242.

The sign of the defocus amount DEF from to DEP2 is determined. As described above, the defocus amount DEF also includes information representing its driving direction, and by determining the sign of the defocus amount DEF, the direction of movement from position DEP to position DEP2 is determined. In this embodiment, a positive sign indicates the driving direction toward the closest side, and a negative sign indicates the driving direction toward the infinite side.

Assuming that the lens positions are now in the relationship shown in FIG. 4, the lens is driven in the close-up direction when moving from DEP to DEP2, so the defocus amount DEF is positive.
At this time, the process moves to step 243.

Step 243: DEP obtained in step 241 above
The number of pulses that divides the number of pulses representing the amount of movement between , and DEP2 into one square is calculated.

Now DEP from DEP2 as shown in Figure 4.

The number of pulses corresponding to the amount of movement is determined.

Further, when it is detected in step 242 that the drive is in the infinite direction, step 2 is executed instead of step 243.
44 is executed.

In such a state, the relationship between DEP and DEP2 is as shown in FIG.

Therefore, in step 244, the number of pulses divided internally between DEP and DEP2 is determined, and this number of pulses becomes the number of pulses representing the amount of lens movement from DEP2 to DEP3.

By doing this, the lens position DEP is divided into 7 on the near side and 10 on the infinity side even if the lens is driven in either the near or infinity direction during the second Daves process.
The number of moving pulses can be found from DEP2 to +,
It becomes possible to shift to the lens position DEP3 of the present application described above.

In this way, step 243. Or at position DEP2 at 244
After determining the number of pulses from the encoder required to move eight lines from DEP3 to DEP3, the process proceeds to 224 and subsequent steps.

Therefore, after this, the lens is driven in steps 243 and 244 in the same manner as the lens driving during the second depth processing.
Steps 234 and 235 move from the position DEP2 by the number of pulses determined in Steps 234 and 235 to move to the position DEP3.
At this point, 0 is set to the flag DEPMV and 1 is set to DEPJF.

That is, in step 227 executed in the third depth processing, the above step 2 is stored in the memory DEPPP.
43,244 from position DEP2 to DEP3
In step 228, DE
The count value representing the lens position of P is stored in memory 5TL.
It will be stored in the POS.

Therefore, after performing step 244 or 243, the steps 224 to 228 described above are executed, and the process proceeds to step 9. From then on, as long as the switch SW1 is kept on, the lens drive for the second Daves process is performed. Similar steps 9 → 17 → 18 → 19 → 20 (200 → 201 → 2
29) or 20 (200→201-229→230→
231→232→233→236) or 20(200→
201 → 229 → 230 → 231 → 232 → 237) are repeatedly executed, and the lens is driven until it reaches a count position within ±4 with respect to the count value (position of DEP) stored in the memory 5TLPO5. When the lens moves to a position within the ±4 pulse range, the flag DEPMV is set at steps 234 and 235 as described above.
is set to O and DEPJF is set to 1, and lens driving in the third Daves process is completed.

It should be noted that even when driving the lens during the third Deira process, servo (close) control is performed to the scheduled lens position.
Even if the switch SWI is turned off once while the lens is being driven, the lens will be driven to the planned position, and if the lens moves to the closest ocular position and becomes unable to be driven, depth processing will not proceed and an NG display will be displayed. Further, when the lens stops at an infinite position, the lens is held at that position and the subsequent dibs processing is performed.

After completing the lens drive in the third Daves process in this way, the steps progress from 9 to 17 to 18 to 19, and 19
1 of the flag DEPJF is detected and the step proceeds to 21 and thereafter, and the flags DEPJF and D are detected.
E P + , D E P 2 .

The set state of DEP3 is detected. At this point the flags DEP OK, DEP I,
Since D E P 2 is set to 0 and D E P 3 is set to 1, steps 21-22→26
→ Proceed to 29 → 30. In step 30, the flag DEP
3 is set to 0, DEPDN is set to 1, and the process then proceeds to step 31 to execute the DAV calculation subroutine shown in FIG. 2(f).

In the DAV calculation subroutine, step 500 is first executed.

Step 500: Lens focal length information is stored in memory NW
Manpower will be provided to FL. Detection of this focal length information is performed in the same manner as step 220 described above.

Subject A that will be in focus by shifting the lens to DEP+ during the first Dave's processing determined in Step 501 and Step 221, and Subject A that will be in focus by shifting the lens to DEF2 during the second depth processing. The aperture value that guarantees the depth to bring both B and B into focus, that is, the memory LSTF in step 221.
The aperture value input to NO (referred to as LSTFNOAV), the focal length information (referred to as r) stored in the memory LSTFL, and the focal length information (referred to as fn) stored in the memory NWFL. Operation LSTF with
NOAV<f2)'
shall be.

This calculation is performed in order to be able to supply an aperture depth that keeps both wave objects in focus even if the zoom ratio of the lens is varied during the Daves process and the focal length information changes.

The above aperture value LSTFNOAV is a value calculated based on the amount of defocus when the focal length is f+, while the amount of defocus is 4 when the focal length is doubled due to the relationship with the focal length.
It has the characteristic of fold change.

In other words, if the defocus amount when the focus is detected at lens position DEP+ with the focal length f1 is DEF, then the defocus amount when this same subject is detected at the focal length @2f is 4DEF, and the above aperture value is LST
FNOAV also changes by a factor of 4 when the focal length changes by a factor of 2.

Therefore, when the focal length at which the aperture value LSTFNOAV was calculated and the focal length at the time of shooting change due to zoom operation, etc., even if the aperture is controlled using the aperture value LSTFNOAV, both waves will remain in focus. depth cannot be guaranteed.

Control the aperture value AVdep and none, focal length or LSTFN
When the aperture changes twice compared to when the OAV was calculated, the aperture is changed four times, and an aperture value that guarantees that both wave objects are always in focus regardless of zoom operation is determined.

Following this step 501, the step proceeds to 502.

Step 502: In this step, it is determined whether the lens attached to the camera is a zoom lens or a fixed focus lens.

This discrimination operation is carried out by the circuit LPR in the computer PRS in the same way as the above-mentioned transmission of the focal length information from the lens to the camera.
5 is specified, the zoom lens information or fixed focus lens information stored in the RAM in the circuit is read out and manually entered into the computer PRS, and the above judgment is made based on this input information. Since the zoom lens or fixed focus lens information is determined for each lens, the zoom lens information is stored in the zoom lens and the fixed focus lens information is stored in the fixed focus lens in the RAM of the lens.

If it is determined in this step that the attached lens is a zoom lens, step 503 is executed and a constant value AV2M is added to the aperture value AVdep to obtain a correction control aperture value AVdep'. This constant value AVzM
By adding the aperture value, the above calculated aperture value Av
The aperture value is a little closer to the aperture value than dep, that is, the aperture value is deeper.

This addition process is for absorbing the error with respect to the calculated aperture value AVdep. That is, in determining the above-mentioned AVdep, even if there are various error factors, the above-mentioned error is corrected by setting the actual control aperture to a deeper aperture value.

Further, if it is determined in step 502 that a fixed focus lens is attached, step 504 is executed instead of step 503.

In this step 504, a constant value A V SNG is added to the aperture value AVd e p to obtain the correction control aperture value AV.
I'm looking for dep'. This addition process also has the purpose of error correction similar to that of the zoom lens described above.

Note that the constant value has a relationship of AVSNG<AVZM. AV in this relationship... The reason for setting AV and M is that since a zoom lens includes more error factors than a fixed focal length lens, the amount of correction thereof should be determined.

After determining the correction control aperture AVdep' in the above step, the step moves to 505.

Step 505: Find an integer J that satisfies.

J is twice the value of the apex value, and by determining this J, an apex aperture value that is one step more accurate than the apex value can be obtained.

That is, the above formula (1) is (2; ) J-1≦AVdep'< (2: )J
++ This is a modified formula of (2), and AVd
To find J that exactly corresponds to ep', (2'i)' = AVdep'
=-(3) to find J. In this case, J is a value that includes not only integers but also decimals, and if J is calculated using equation (1) based on equation (2) above, the decimal part of J obtained using equation (3) above is rounded up.

Therefore, the aperture value J obtained using equation (1) is AVdep'
This value is twice the apex value of , and is rounded up with one level of accuracy, indicating an aperture value on the narrower side, and further correction for error absorption is performed in this step process. After this, the step moves to 506, and the J obtained in step 506
is converted into a real number of aperture value.

In addition to the above-mentioned purpose of error absorption, the process in step 505 is to match the mechanical control stage number of the aperture of the camera, and since the aperture value of one stage of the apex is obtained, the mechanical control stage number of the camera is determined. For example, a 77 step precision such as 8'4'3' can be used.

When the DAV calculation subroutine is completed as described above, the process moves to step 32, where a DAV display routine is executed. This subroutine is a routine for displaying the real number of apertures obtained in the DAV calculation subroutine on the display device DSP, and its display operation is performed in the same manner as described above.

Moreover, when step 32 is performed, the process moves to step 33 to allow the release operation, and the process moves to step 25 to set the flag DE.
Set POK to 1 and return to step 9. Therefore, if switch SW1 is kept on in this state,
Thereafter, steps 9→17→18→19→21 are repeated. Also, even if the switch SW1 is turned off in this state, the steps 9→10→12→14→15 are repeated, and even if the switch SW1 is turned on again, the steps 9→17 are repeated.
→ 18 → 19 → 21 is repeated. Therefore, even if the switch SW1 is accidentally turned off after all depth processing is completed, the results of the Daves processing will be maintained as they are.

When the second step of the shutter button is operated in this state, the release operation process in the AE control subroutine in step 3 is performed in the interrupt process, and a signal corresponding to the aperture value J determined by the above calculation is sent to the computer PR3. S.O.
The signal is transmitted to the circuit LPR3 via the circuit LCM,
The step motor DMTR is driven, the aperture linked to the motor is narrowed down according to the above J, and the shutter release operation is performed, and the shutter time at that time is the photometric value in step 17 and the aperture value determined by the above J. The shutter value is determined based on the shutter value.

With the above operation, in Dave's mode, subjects at different positions are moved to the close side 7. The lens is set at a focus position that is divided into 10 points on the infinity side, and the aperture is set to a depth that ensures that both wave objects are in focus.

In addition, in the second and third Daves processing mentioned above, 2
The actual driving amount of the lens is determined based on the number of pulses determined according to the defocus amount determined in the second Daves processing, and the lens is driven by this actual driving amount, so the zoom ratio is changed during the defocusing process. Even if the lens reaches the infinite end, the lens can be accurately moved to the internal dividing point of the square of the double-wave object as described above.

In addition, in the Dave's mode, the release operation by turning on the switch SW2 remains unchanged until the third Dave's processing is completed.
This means that even if you accidentally press the second release button during depths mode, you can still perform the subsequent Daves processing, and if you mistakenly press the shutter button until the Daves mode ends. However, the mote is maintained.

In addition, in the embodiment, the counter that counts the pulses from the encoder ENC counts up and down the human caballus, and always shows a value that represents the lens position after the lens is driven.Furthermore, when driving the lens for the defocus amount, Although the lens drive amount is controlled to match the defocus amount by determining whether the change in the count value from the count value has become a value corresponding to the defocus amount, there are other ways to control the lens drive amount. Drive amount control may also be performed.

Further, a limit switch may be provided at each limit end as a method of detecting when the lens hits the infinite end or the closest end position.

Also, a method for determining whether or not the lens will hit the limit edge when the lens is driven based on the second defocus amount is to use the calculated defocus amount, the current lens position, and the distance to the lens limit edge. In this case, it is necessary to detect absolute value information from the lens as the current position information of the lens.

〔effect〕

As described above, in the present invention, the calculated aperture value is converted into a value in steps of an integer multiple of the minimum control step number of the aperture control mechanism, and in this conversion process, the aperture value is converted into a value in steps of an integer multiple of the minimum control step number of the aperture control mechanism. When a value in between is rounded up, the control aperture is offset to the aperture side with respect to the calculated aperture, absorbing the error included in the aperture calculation, and improving the aperture control mechanism. By controlling the number of aperture stages, it is possible to prevent the aperture value from becoming more open than the calculated aperture, and it is possible to always satisfy the desired shooting mode and to shoot with both waves in focus. be.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the camera of the present invention, and FIG.
2(a) to 2(f) are explanatory diagrams showing programs built in the computer PR5 of the embodiment in FIG. 1, FIG. 3, and FIG. 4. FIG. 5 is an explanatory diagram for explaining the operation of the embodiment shown in FIG. PR5---------Computer L RRS
-------Control circuit L CM -------M-Buffer circuit D MT
R------One stop control motor ←---------
−−−−−−−−−−−N2

Claims (1)

[Claims] The amount of defocus between subjects at different positions is determined by a focus detection calculation means, and the control value is calculated for a lens position that internally divides the amount of defocus and a control aperture value based on the amount of defocus. A camera having a focus adjustment device that moves the lens to the internal lens position and sets the aperture as a control aperture value when photographing, and photographs subjects at different positions as described above with both objects in focus. The control aperture value obtained by the control calculation means is converted into a value for each aperture stage unit that is an integral multiple of the minimum control stage number of the aperture control mechanism, and the control aperture value is converted into a value for each aperture stage unit that is an integral multiple of the minimum control stage number of the aperture control mechanism. Provide a conversion means that rounds up when it is a value,
A camera having a focus adjustment device, characterized in that the aperture control mechanism adjusts the aperture based on the aperture value in units of the number of aperture stages converted by the conversion means.