JPH0713697B2 - Image magnification control device for camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an image formed by a photographing lens of another camera such as a single-lens reflex camera, a video still camera, etc., which is controlled by a zoom driving means. The present invention relates to a camera image magnification control device for automatically controlling a magnification to a set magnification.

(Prior Art) As an image magnification control device for this type of camera, for example, there is an interlocking mechanism for a zoom lens device as disclosed in Japanese Patent Publication No. 60-1602.

This zoom lens device interlocking mechanism controls the zoom amount of the zoom lens by a cam mechanism provided in the zoom lens and an electric circuit linked to the cam mechanism so that the ratio between the actual target distance and the actual focal length becomes constant. It was made to let you.

On the other hand, some cameras have a CPU for autofocus control and program control. In such a camera, it is conceivable that the zoom lens can be driven by a motor and that the above-described image magnification control is performed.

(Problems to be Solved by the Invention) In the case of performing this image magnification control, in continuous shooting mode, if the subject moves after focusing and releasing until the next release processing, the release is not in focus. In some cases, the processing may be performed, resulting in out-of-focus photography.

In this case, in this case, that is, in the continuous shooting mode, the focus is released, the focus is re-focused, and the release process is performed. An object of the present invention is to provide an image magnification control device for a camera, which is capable of taking a photograph in focus even if a subject moves before processing.

(Means for Solving the Problem) In order to achieve the above object, the image magnification control device for a camera according to the present invention includes a zooming lens driven by a zoom driving means and a focusing lens driven by a focus driving means. The taking lens, the focal length detecting means for detecting the focal length of the taking lens, the focus detecting means for detecting the defocus amount dx of the taking lens with respect to the subject by using the light flux incident on the taking lens, and the extension amount of the focusing lens And a means for calculating the distance xo between the rear focus and the focus position based on the focus driving means for controlling the focus driving means so that the photographing lens is in focus when defocus is detected by the focus detecting means. The image magnification set by the magnification setting means
The zoom drive amount is calculated from xo and dx to control the zoom drive unit so as to maintain the set image magnification, and at the latest, the drive of the zoom lens by the zoom drive unit is completed before the drive of the focus lens by the focus drive unit is completed. Select either the drive control means to start, the shooting mode in which the release operation is continuously performed while the release switch is turned on, or the single shooting mode in which the release operation is performed only once when the release switch is turned on. The drive control means controls the image magnification to be kept constant for each release when the continuous shooting mode is selected by the mode selection means.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic explanatory view of a camera provided with a function of keeping the image magnification constant regardless of the movement of the subject. In FIG. 1, 1 is a camera body, 2 is a lens mount of the camera body 1, 3 is a taking lens detachably attached to the lens mount 2, and the taking lens 3 is an autofocus mechanism (focus driving means). It has an AF mechanism) and a power zoom mechanism (PZ mechanism) which is a zoom driving means.
Note that, here, AF is an abbreviation for autofocus, and PZ is an abbreviation for power zoom.

The camera body 1 has a camera control circuit 4 as shown in FIG.
And the lens control circuit 5 shown in FIG. 3 is provided in the taking lens 3.

[Camera Control Circuit 4] The camera control circuit 4 has a main CPU 6 and a display CPU 7. The serial output terminal SO of the display CPU 7 is connected to the serial input terminal SI of the main CPU 6, and the serial output terminal SO of the display CPU 7 is connected to the serial output terminal SO of the main CPU 6.
SI is connected, and the clock terminal SCK of the display CPU 7 is connected to the clock terminal SCK of the main CPU 6.

In addition, the DX circuit 8 for film ISO sensitivity detection (DX code detection) is connected to the terminal PF of the main CPU 6, and the main CP
To the terminal P20 of U6, the switch SWAF A / M for auto / manual switching on the camera body side is connected, and the terminal of the main CPU6
The switch SWAF S / C for focus / release priority switching is connected to 21.

A wiring 9 is connected to the DX circuit 8, the switch SWAF A / M, and the switch SWAF S / C. Between this wiring 9 and the terminals P2 to P9 of the display CPU 7, the photometric switch SWS, the release switch SWR, the power ON / OFF lock switch SWLOCK, the mode switch SWMODE, the drive switch SWDRIVE, the exposure compensation switch SWXV, and the up switch. A switch SWUP and a down switch SWDOWN are provided respectively. And these constitute the operation switch group sw-I. This mode switch SWMODE
By operating the and switches SWUP and SWDOWN in combination, program shooting, automatic shooting, manual shooting, etc. can be selected. Moreover, the switches SWUP, SWDOW
By operating N in combination with the drive switch SWDRIVE, you can switch between continuous shooting (continuous shooting), single shooting (one shot), self-timer, etc.
The exposure value can be corrected by operating in combination with SWUP and SWDOWN and the exposure correction switch SWXV. still,
The metering switch SWS and the release switch SWR are two-step operation buttons that can be operated sequentially in this order.

Main CPU6 has terminals PA, PB, PC, PD, PE, VDD, G
Is input to the output of the light receiving element 10 for subject brightness photometry that enters through the taking lens 3 through the A / D conversion circuit 11,
The exposure compensation signal is output from the terminal PB and the exposure control circuit 12
Entered in. Further, an AF CCD, that is, a focusing CCD 14 is connected to the terminal PC via a CCD processing circuit 13 as a defocus amount detecting means. This CCD14 is a taking lens 3
The light beam from the subject is received and used for focus detection and the like. A motor control signal is input to the AF motor control circuit 15 from the terminal PD, and the AF motor control circuit 15 is connected to the camera body 1
It controls the drive of the AF motor 16 inside.

The AF motor 16 rotationally drives a coupler 18 via a reduction gear 17. When the lens-side coupler that interlocks with the focusing lens group is provided at the end of the lens barrel, the coupler 18 is engaged with the lens-side coupler when the taking lens 3 is mounted on the lens mount 2. Then, the AF motor 16 and the focusing lens group of the taking lens 3 are interlocked with each other, so that the focusing lens group can be focus-driven by the AF motor 16. Since the lens of this embodiment has no lens-side coupler that engages with the coupler 18, the focusing lens group is not driven by the AF motor 16. A pulsar 19 is linked to the reduction gear 17, and the output of the pulsar 19 is input to the terminal PE of the main CPU 6.

The display LCD 20 is connected to the terminal P _SEG of the display CPU 7. The terminals P10 to P17 of the display CPU7 are connected to information transmission connection terminals Fmax1 to Fmax3, Fmin1, Fmin2, connection terminals A / MT for auto / manual information, common connection terminal Cont, and connection terminal Vdd for power supply. -T is connected respectively. Display CPU
An ON / OFF signal is input to the switch circuit 21 from the terminal P18 of 7, and the switch circuit 21 has a connection terminal VBat-T for power supply.
Are connected.

Further, on the positive side of the battery 22, Vdd1 of the display CPU 7 and the grounded capacitor 24 via the regulator 23.
, The power supply terminal VDD of the main CPU 6 is connected via the DC / DC converter 6 ′, and the switch circuit
21 is connected. Then, an ON-OFF control signal is input to the DC / DC converter 6'from the terminal P1 of the display CPU 7.

On the other hand, on the negative side of the battery 22, the ground terminal Gnd of the main CPU 6, the ground terminal Gnd of the display CPU 7, the wiring 9 of the operation switch group SW-I, and the connection terminal Gnd-T for grounding are connected.

Connection terminals Fmax1 to Fmax3, Fmin1, Fmin2, Cont, Vdd-T,
The VBatt and Gnd-T are arranged on the end surface of the lens mount 2 and constitute a connection terminal group TI of the camera body.

In such a configuration, when the main switch, that is, the lock switch SWSLOCK is in the OFF state, no operation signal is input from the terminal P1 of the display CPU 7 to the DC / DC converter 6 ′, so that the main CPU 6 receives power from the battery 22. Not supplied, this main CPU6 is in the OFF state.

On the other hand, since the voltage of the battery 22 is applied to the terminal VDD of the display CPU 7 via the regulator 23, the display CPU 7
Is operating even when the lock switch SWLOCK is OFF.
In this state, the display on the display LCD 20 is off.

When the lock switch SWLOCK is turned on, this ON signal is input to the terminal P4 of the display CPU 7, the display signal is input from the terminal P _SEG of the display CPU 7 to the display CPU 20, and the display LCD 20 lights up. At the same time, an operation signal is input from the terminal P1 of the display CPU to the DC / DC converter 6 ', and the voltage of the battery 22 is transmitted via the DC / DC converter 6'to the main CPU.
Applied to pin 6 VDD. This causes the main CPU 6 to operate.

[Powers focus structure of taking lens 3] This taking lens 3 has a power zoom mechanism for driving the zoom lens groups 25 and 26 shown in FIG.
It has a focus drive mechanism for driving a focus lens (not shown).

The power zoom mechanism includes a cylindrical fixed frame 27, a lens frame 28 fitted in the fixed frame 27 so as to be movable back and forth in the axial direction, and a fixed frame.
A first cam barrel 29 rotatably fitted to the outer periphery of 27, a second cam barrel 30 rotatably fitted to the outer periphery of the first cam barrel 29 and movable in the axial direction, and a cam. It has a lens frame 31 fixed to a cylinder 30. The lens groups 25 and 26 are attached to the lens frames 27 and 31.

A guide hole 32 parallel to the axis is formed in the fixed frame 27, slit cams 33 and 34 are formed in the cam cylinder 29, a slit cam 35 and a guide hole 36 parallel to the axis are formed in the cam cylinder 30. Has been done. Moreover, the guide roller 37 mounted on the outer periphery of the lens frame 28 is insert-engaged with the guide hole 32 and the slit cam 33, and the guide roller 37 mounted on the outer periphery of the fixed frame 27 is insert-engaged with the slit cam 34 and the guide hole 36. Cam tube
A guide roller 39 mounted on the outer circumference of 29 is inserted and engaged with the slit cam 35.

The focus drive mechanism described above has an AF motor M1 that drives a focus lens group (not shown), and the power zoom mechanism has a PZ motor M2 that drives a cam barrel 29. A variable diaphragm (not shown) arranged in the optical path of the taking lens 3
Is controlled by the AE motor M3. The motor M1 and the focus lens group, and the motor M2 and the zoom lens group are linked via a friction clutch.

A zoom position reading means is interposed between the base of the cam barrel 29 and a code plate mounting member (not shown) on the fixed frame 27 side as one of focal length detecting means. The zoom position reading means includes a zoom code plate 40 held by a code plate support member and arranged concentrically around the cam barrel 29, and an inner peripheral surface bullet of the zoom code plate 40 attached to the base of the cam barrel 29. It has a brush 41 in contact therewith (see FIG. 5). Moreover, a plurality of pattern contact points are provided intermittently in the circumferential direction on the inner peripheral surface of the zoom code plate 40.
By cooperating with each other, a zoom position signal is output from the zoom code plate 40.

Similarly, a focus position reading means, that is, a distance reading means (not shown) is also provided on the focus lens side as one of the focus position detecting means. This distance reading means also has a structure similar to that of the zoom position reading means and is similar to the zoom code plate 40.
The distance signal can be obtained from FIG.

[Lens Control Circuit 5] On the end surface of the connection portion of the taking lens 3 to the lens mount 2,
Connection terminals Fmax1 '~ Fmax3', Fmin1 ', Fmin2', Cont ', Vd
dT ′, VBatt ′, Gnd-T ′ are arranged. This connection terminal Fmax1 '~ Fmax3', Fmin1 ', Fmin2', Cont ', Vdd-T',
VBatt 'and Gnd-T' have connection terminals Fmax1 to Fma when the taking lens 3 is mounted on the lens mount 2 of the camera body 1.
x3, Fmin1, Fmin2, Cont, Vdd-T, VBatt, Gnd-T are respectively connected to form a connection terminal group T-II. This connection terminal group
T-II and TI form the connection TC. Data is transmitted between the camera control circuit 4 and the lens control circuit via the connection portion TC.

In the taking lens 3, a lens ROM 43 for storing information peculiar to the lens and a lens CPU 44 used for controlling the lens are built in. The information peculiar to the lens includes, for example, the maximum number of pulses of the focus lens group and the zoom lens group, whether power zoom is possible, whether power focus is possible, whether it is a varifocal lens, focus correction value by zoom, etc. There is information on. This lens
The output signal of the zoom code plate 40 is input to the terminal PL of the ROM 43 and the terminal PK of the lens CPU 44, and the distance signal from the distance code plate 42 is input to the terminal PM of the lens ROM 40.

The motor control signals output from the terminals PH, PI, and PJ of the lens CPU44 are AF motor drive unit (AF motor control circuit) 45, PZ motor drive unit (PZ motor control circuit) 46, AE motor drive unit (A
E motor control circuit) 47. And
The motor drive units 45, 46, 47 drive and control the motors M1, M2, M3, respectively. The rotation of the motors M1, M2 and M3 is controlled by the AF pulser 48 (one of focus position detection means) and the PZ pulser 4
9 (zoom position detection means, that is, one of the focal length detection means), AE pulsar 50 detects this pulsar 48, 4
The output signals of 9,50 are input to the terminals P20 to P22 of the lens CPU 44, respectively.

The connection terminal VBat-T 'is connected to the power supply input section of the motor drive units 45 to 47, and the connection terminal Vdd-T' is the power supply terminal Vd of the lens CPU44.
It is connected to d and has one end of resistor 51 and diode 5
The other end of the resistor 51 and the anode side of the diode 52 are connected to the cathode side of 2 and the reset terminal of the lens CPU44
It is connected to ▼ and is also connected to the ground wire 53 through a condenser 54. In this ground wire 53,
Connection terminal Gnd-T ′, lens ROM43 ground terminal Gnd, lens
The ground terminal Gnd of CPU44 is connected. In addition, this ground wire 53 has a switch for automatic manual switching.
SWAF (A / M), switch for power zoom mode SWPZ (A
/ M), image magnification constant mode switch SWPZC that keeps the image magnification of the zoom lens constant, zoom switch SWPZT that drives the zoom lens to the Tele end (telephoto end) side, the zoom lens
The zoom switch SWPZW that drives to the Wide end (wide-angle end) is connected. These switches SWAF (A / M), SWPZ (A / M
M), SWPZC, SWPZT, and SWPZW are connected to the terminals P23 to P27 of the lens CPU 44, respectively.

The connection terminal Fmax1 ′ is connected to the reset terminal RESET of the lens ROM43, the INT terminal (interruption terminal) Int of the lens CPU44 and the emitter of the transistor 55, and the connection terminal Fmax2 ′ is the clock terminal SCK of the lens ROM43, the clock terminal SCK of the lens CPU44 and Connected to the emitter of the transistor 56, the connection terminal Fmax3 'is the serial output terminal SO of the lens ROM43, the serial input / output terminal SI / SO of the lens CPU44 and the transistor 57.
Connected to the emitter. Also, the connection terminal Fmin1 ′
Is connected to the terminal ▲ ▼ of the lens CPU 44 and the emitter of the transistor 58, the connection terminal Fmin2 ′ is connected to the ground wire 53 via the fuse 59 for setting information, and the connection terminal A /
MT 'is connected to the ground wire 53 through a switch SW A / M used for switching between auto or program operated by a diaphragm ring, and the ground of the connection terminal Cont' and the bases of the transistors 55 to 58 are the power source of the lens ROM43. It is connected to the input terminal VC. Moreover, the collectors of the transistors 55 to 58 are connected to the ground line 53.

[Principle of Constant Image Magnification] In FIG. 6, F ₁ is the front (object side or subject side) focal position of the taking lens 3, F ₂ is the rear (image side) focal position of the taking lens 3, and y ₁ Is an object (subject) in front of the taking lens 3
, Y ₂ is the size of the image formed behind the taking lens 3 by the light flux from infinity, a is the distance from the front focus position F ₁ to the object, and x is the image from the rear focus position F _2. Distance to
f is the focal length of the taking lens 3. Then, the position where the image of y ₂ is formed becomes the focus position.

The image formation formula in FIG. 6 is as follows: a · x = f ² ...... A Is.

Here, when the image magnification is calculated from the equations A and B based on the distance a on the object side, the image magnification m is Becomes

Further, when the image magnification is calculated from the A and B expressions with the distance x on the image side as the reference, the image magnification m is Becomes

X and f in this equation are expressed by x ₀ and f as shown in FIG.
If the image magnification when f ₀ is m ₀ , the image magnification m ₀ is Becomes Here, in the case where the object y ₁ moves to cause a defocus dx as shown in FIG. 7B,
Assuming that the distance from the front focus position F ₁ to the object (subject) y ₁ is a ₁ , the formula A is a ₁ (x ₀ + dx) = f ₀ ² ……, and the distance a ₁ is Becomes Here, if a new focal length for constant image magnification (m ₀ ; constant) is f, the formula is Becomes If this equation is transformed with respect to f and the equation is substituted into this transformed equation, Becomes When the zoom ratio is calculated from this formula, the zoom ratio f /
f ₀ is Becomes

Therefore, if the zoom ring is driven so as to change by this zoom ratio, the image magnification is constant (m ₀ =
f / a ₁ = x ₀ / f ₀ ).

By the way, the focal length f of the taking lens 3 depends on the zoom position and the focus position, and the focal curved surface 60 shown in FIG.
It changes three-dimensionally like. As a result, the distance x ₀ to the image plane described above also changes three-dimensionally as the curved surface 61 shown in FIG. 9 depending on the zoom position and the focus position.

Also, depending on the zoom position of the taking lens 3, K value Kv
al (lens extension amount and focus shift ratio) changes. The relationship between the zoom position by the zoom code plate 40 and Kval changes stepwise as shown by the correction coefficient line 62 shown by the solid line in FIG. 10, and the relationship between the zoom position and the focal length at this time is also the first.
It changes stepwise as shown by the correction coefficient line 63 in FIG. In the case of FIG. 10 and FIG. 11, the correction coefficient lines 62 and 63 are broken lines 62 ′,
It is desirable for zoom control and focus control to obtain a smooth change as indicated by 63 '. Therefore, information for correction shown in Table 1 is stored in the lens ROM 43 in advance, and f and x ₀ are calculated by the lens CPU 44.

Table 1. [Information for correction] 01 Number of head pulses in encoder on zoom code plate
P _h 02 Zoom pulse code head pulse width in encoder
P _w 03 Start Kval K _h 04 Start Kval correction coefficient K _c 05 Start focal length f _h 06 Start focal length correction coefficient f _c 07 Focus lens position, focal length primary correction coefficient f _fc1 08 Focus lens position, focal length Secondary correction coefficient f _fc2 09 Delivering amount x ₀ Calculation coefficient Q, R, S, T 10 Image magnification ratio → Zoom drive pulse conversion coefficient A, B, C where the first Kval, that is, the first K value, is the 10th Kval on either the left or right side of the step K _i (I = 0, 1, 2, 3, ... N) of the correction coefficient line 62 in the figure. That is, L
When going from the (Tel) side to the S (wide) side, the right end of the stepped portion K _i , and when going in the opposite direction, the left end of the stepped portion K _i is set to Kval.
And

For the correction coefficient Kc of the head Kval, the value corresponding to the curve 62 '
It is a coefficient for calculating the slope of a straight line appropriately in K _i . Further, the head focal length f _h is one of the left and right ends of the correction coefficient line f _i (I = 0,1,2,3, ... N) as in the head Kval, and the head focal length correction coefficient fc Correction curve 63 '
Is a coefficient for approximately calculating the value corresponding to as the slope of the straight line in the step portion f _i . Obtained in this way
Kval and focal length are correction curves 62 ″, 6 in FIGS. 12 and 13.
3 ". The focus lens position focal length primary correction coefficient f _fc1 is obtained from the curve 64 determined by the zoom position and the focal length shown in FIG. The distance quadratic correction coefficient f _fc2 is determined by the three-dimensional focus curved surface 60 in which the focus amount is considered in the above f _fc1 .

The focal curved surface 60 is a curved surface that is determined by the optical design and mechanical design of the taking lens 3, and is not a curved surface that cannot be exactly and proportionally represented by a simple formula. The amount of extension of the focus lens defined by the curved surface may be almost proportional to the zoom amount of the zoom lens, but it is not completely proportional even in this case. Therefore, it is necessary to correct the amount of extension of the focus lens. The correction factors for this are Q, R,
S, T, and these correction factors Q, R, S, T vary depending on the optical design and mechanical design of the lens.
The formula using Q, R, S, and T also changes depending on the optical design and mechanical design of the taking lens. Further, the zoom lens drive pulse number Pz used for controlling the image magnification constant is also determined by the optical design and mechanical design of the taking lens. Therefore this
The correction coefficients A, B, C of the equation for calculating Pz are values determined by optical design and mechanical design.

Let Ps be the absolute position pulse number of the current zoom ring of the taking lens 3, and Pi be the absolute position pulse number of the current focus lens.
If nf, the focal length f and the amount of extension x ₀ are f = f _h + fc × (Ps-P _h ) + f _fc1 × Pinf + f _fc2 × (Pinf) ² ...
... x ₀ = Q (Pinf) ³ + R (Pinf) ² + S (Pinf) + Pinf × T (P _h
-Ps) ... can be obtained as. In this case, Pinf should be kept small in consideration of the overshoot of the feed amount toward the infinite side. Also,
When the control image magnification is γ, the zoom drive pulse number Pz is obtained as Pz = Aγ ³ + Bγ ² + Cγ.

The data as shown in Table 1 and the above-described calculation formulas are stored in the lens ROM 43 of the taking lens 3 in advance.

The main terms used in the flowchart for explaining the control operation of the camera control device having such a configuration will be described.

In this flowchart, AFSTOP indicates a process of stopping the focusing lens group.

FL is an abbreviation for Far Limit and indicates a flag for detecting the far end of the focusing lens group. When FL = 1, it means that the control circuit detects that the focusing lens group is at the Far end, and when FL = 0, the Far end is not detected.

NL is an abbreviation for Near Limit and indicates a Near end detection flag of the focusing lens group. When NL = 1, it means that the control circuit detects that the focusing lens group is at the Near end, and NL =
When it is 0, it indicates that the Far end is not detected.

Pinf is the number of drive pulses from the Far end side to the Near end side of the focusing lens group, and when Pinf = 0, it means that the focusing lens group is at the Far end. This pulse number is detected by the AF pulser 48.

WL is an abbreviation for Wide Limit and represents a Wide end detection flag of the zooming lens group. When the flag WL is WL = 1, it means that the control circuit detects that the zooming lens group is at the wide end (Wide end), and when WL = 0, the Wide end is not detected. Means that.

TL is an abbreviation for Tele Limit, which is a Tele end detection flag of the zooming lens group. When this flag TL is TL = 1, the zooming lens group is Tele
It means that the control circuit detects that it is at the end,
When TL = 0, it means that the tele end is not detected.

MFL is an abbreviation for Macro Far Limit, and indicates a Far end detection flag of a focusing lens unit by zoom driving in a macro region, that is, a Far end detection flag by driving a zooming lens unit in a macro region. When the flag MFL is MFL = 1, it is determined from the signal output from the zoom code plate 40 that the zooming lens group is in the tele macro mode, and the Far at focusing is set.
It means that the control circuit detects that it is at the end. When MFL = 0, it means that the Far end is not detected.

MNL is an abbreviation for Macro Near Limit, and indicates a Near end detection flag of a focusing lens unit by zoom driving in a macro region, that is, a Near end detection flag by driving a zooming lens unit in a macro region. When this flag MNL is MNL = 1, the zoom code plate
This means that the control circuit detects from the signal output from 40 that the zooming lens group is in the tele macro state and is at the Near end during focusing. Also,
When NFL = 0, it means that the Near end is not detected.

SWREN is a release permission flag, and the flag SWREN is SWREN =
When 1, release is enabled and flag SWREN is SWREN = 0
Indicates that release is not allowed.

MF is an abbreviation for manual focus (Manual Focus) and indicates a flag during manual focus. This flag MF is MF
When = 1, it indicates that manual focus is in progress, and when MF = 0, it indicates that manual focus is not in progress.

AF is an abbreviation for auto focus and indicates a flag during auto focus. When the flag AF is AF = 1, it indicates that autofocus is in progress, and when AF = 0, it indicates that autofocus is not in progress.

PZMACRO is a flag indicating whether or not the zoom lens group is in the macro area by the power zoom mechanism. When this flag PZMACRO is PZMACRO = 1, it means that the zooming lens group is in the macro area. When PZMACRO = 0, it means that the focusing lens group is not in the macro area.

AFGO indicates a focusing lens group drive flag. When the flag AFGO is AFGO = 1, it means that the AF motor M1 is operating and the focusing lens group is driven.
When it is 0, it means that the focusing lens group is not driven by the AF motor M1.

PZGO indicates the zooming lens group drive flag, and the flag PZ
When GO is PZGO = 1, it means that the PZ motor M2 is operating and the zooming lens group is being driven, and when PZ = 0, it means that the zooming lens group is not being driven by the PZ motor M2. .

PZMGO indicates a flag indicating whether the zooming lens group is driven by the PZ motor M2 in the macro area. When the flag PZMGO is PZMGO = 1, it means that the zooming lens group is driving, and when PZMGO = 0. Means not driving.

PZMODE is a flag indicating whether or not the zooming lens group can be driven by the power zoom mechanism. When PZMODE = 1, driving is possible, and when PZMODE = 0, driving is not possible.

MAGIMG is a flag for starting constant image magnification control, and MAGIMG = 1
When, the image magnification constant control is started, and when MAGIMG = 0, the image magnification constant control is not performed. ONIMG is a flag indicating whether or not constant image magnification control is being performed. When ONIMG = 1, it means that constant image magnification control is being performed, and when ONIMG = 0, it means that constant image magnification control is not being performed.

AFFARGO indicates a process of driving the focusing lens group in the Far direction, and AFNEARGO indicates a process of driving the focusing lens group in the Near direction. AFDRVF is a flag indicating which direction the focusing lens group is driven in this process. When AFDRVF = 1, the driving direction is Far, and when AFDRVF = 0, the driving direction is Far. It means not in the Near direction.

PZTELGO indicates a process for driving the zooming lens group in the Tele direction, and PZWIDEGO indicates a process for driving the zooming lens group in the Wide direction. In addition, PZDRVF is a flag that indicates which drive direction of the zooming lens group is in this process. When PZDRVF = 1, the drive direction is the Tele direction, and PZDRVF is
When DRVF = 0, it means that the driving direction is not the Tele direction but the Wide direction.

MCRFARGO shows the driving process of the zooming lens group for the focusing lens group in the macro area.
RGO represents the driving process of the zooming lens group for the focusing lens group in the macro area. And MC
RDRVF is a flag that indicates which direction the zooming lens group is driven in this process. When MCRDRVF = 1, the driving direction is the Far direction, and when MCRDRVF = 0, the driving direction is not the Far direction but the Near direction. Means that.

AFS is a focusing priority mode flag, which means that focusing priority is given when AFS = 1 and release priority is given instead of focusing priority when AFS = 0.

AFCORR is an abbreviation for AF CORRECT, and when a zoom operation is performed on the zooming lens group while focusing is in focus, there is a shooting lens (for example, a varifocal lens) that is out of focus. It is a flag for making it. When AFCORR = 1, it means that the focus shift is corrected, and when AFCORR = 0, this correction is not performed.

ON / OFF of the macro switch means, in the information from the zoom code plate 40, whether or not the zooming lens group is in the macro area.

Next, the control operation of the camera control device having such a configuration will be described using a flowchart.

When the lock switch SWLOCK is turned on, the camera control circuit 4
The operation of the control device including the lens control circuit 5 and the lens control circuit 5 starts as shown in FIG. 14, and is initialized in S1.

In this initialization, as shown in Fig. 33, first, S1
With -1, the AF mode SW (AF mode switch), that is, the switch SWAF A / M, SWAF (A / M) for auto / manual switching
It is judged whether or not it is ON, and if it is ON, YES (AF)
Then shift to S1-2, and if it is not ON, NO (manual)
Move to S1-26. In S1-2, the focusing lens, that is, the focusing lens group is driven to the Far end (far end).

This drive processing is performed by the subroutine shown in FIG. In the S-AFG1 of FIG. 34, the focusing motor group 45 is driven to drive the focusing lens group to the Far end side by operating the AF motor M1. And S-AFG2
Set the Far direction drive flag AFDRVF = 1 at, and set the flag AFGO = 1 when the focusing lens group is not driven at S-AFG3.
Near Limit (near limit) of focusing lens group with S-AFG4
(Limit end), that is, Near end detection flag NL is set to NL = 0, and Far Limit (Far limit), that is, Far end detection flag FL is set to FL = 0, the process returns to FIG. 33 and proceeds to S1-3.

Also, while the focusing lens group is being driven to the Far end side,
A drive pulse is output from the F pulsar 48, and this drive pulse is input to the lens CPU 44. Whether or not this drive pulse is output from the AF pulser 48 is determined in S1-3 of FIG. This determination is made when the pulse interval is 100 msec or less, and if NO (less than 100 msecM) is output, the determination is repeated by looping until YES (100 msec or more). When this pulse interval exceeds 100 msec, the focusing lens group is driven to the Far end and stopped, and the AF motor M
The friction clutch that links 1 and the focusing lens group is slipping. Therefore,
When the pulse interval is 100 msec or more, YES (100 mse
After c), shift to S1-4 and AF STOP. In this AF STOP, as shown in FIG. 40, the S-AS1 determines whether or not the focusing lens group is being driven (AFGO = 1), and if not, it is NO and S1 in FIG. 33 is selected. Move to -4. Also, S-AS
YES if the focusing lens group is driven according to judgment 1
In S-AS2, the driving of the focusing lens group is stopped by stopping the operation of the AF motor M1 in S-AS2, and the process proceeds to S-AS3. In this S-AS3, the focusing lens group driving flag AFGO is set to the non-driving flag AFGO.
= 0, and the process proceeds to S1-5 in FIG. In S1-5, the Far end detection flag FL of the focusing lens group is set to FL = 1. At this time, since the focusing lens group is not at the Near end, the process proceeds to S1-6, the Near end detection flag NL of the focusing lens group is set to NL = 0, and the process proceeds to S1-7.

In addition, if the AF switch SW of S1-1, that is, the switch SWAF A / M for automatic / manual switching is ON, it is NO (manual), which position is the focusing lens group. Since it is not known whether or not the Far end detection flag FL is set to FL = 0 in S1-26, the Near end detection flag NL is set to NL = 0 in S1-27 and the process proceeds to S1-7.

At the stage of S1-7, since the focusing lens group is at the Far end and the driving pulse number Pinf from the Far end of the focusing lens group is 0, Pinf = 0. After this, S1-8
Then, the Wide end detection flag WL of the zooming lens, that is, the zooming lens group is set to WL = 0, and the zooming lens group of the zooming lens group is set at S1-9.
The Tele edge detection flag TL is set to TL = 0, and in S1-10, the focusing lens group is driven by the zoom ring drive in the macro area.
The far end detection flag MFL is set to MFL = 0, and the focusing lens group by the zoom ring drive in the macro area is set in S1-11.
Near end detection flag MNL is set to MNL = 0, release permission flag SWREN is set to SWREN = 0 in S1-12, manual focus flag MF is set to MF = 0 in S1-13, and auto focus flag is set in S1-14. The AF is set to AF = 0, and the process proceeds to S1-15.

In S1-15, it is judged whether or not the macro switch is turned on and it is in the macro area. If YES (ON), the process moves to S1-16 to set the macro area flag PZMACRO to PZMACRO = 1 and NO (OFF).
If so, move to S1-17 and set the macro area flag PZMACRO.
Set PZMACRO = 0 and move to S1-18.

In S1-18, the focusing lens group drive flag AFGO is set to AFG.
O = 0, and in S1-19, zooming lens group drive flag PZ
GO is set to PZGO = 0, and in S1-20, the AF drive flag PZMGO by the PZ mechanism (power zoom mechanism) in the macro area is set to PZMGO = 0.
In S1-21, set the flag PZMODE during power zoom drive to P
ZMODE = 0, the flag MAGIMG for starting the constant image magnification control is set to MAGIMG = 0 in S1-22, the ONIMG constant control flag ONIMG is set to ONIMG = 0 in S1-23, and in S1-24, for example, 5 msec. Start the timer, enable the timer interrupt in S1-25, and move to S2 in Fig.14.

In this S2, it is judged whether or not the AF mode switch, that is, the switch SWAF A / M for automatic / manual switching is ON. If it is ON, YES (AF) is followed by S3, and if it is not ON. If NO (manual), move to M in Fig. 21.

With the S-M1 in Fig. 21, the AF mode switch (switch SWAF A
/ M) is turned on and it is determined whether or not the AF operation is in progress (AF = 1).
If YES (AF operation is in progress), the process moves to K in FIG. 29, and if NO, S-M2 is in the manual focus flag MF.
Is set to MF = 1, the process shifts to S-M3, and the defocus amount dx of the focusing lens group is obtained by this S-M3, and then it is determined whether or not the contrast is low in S-M4. In this determination, if the contrast is low, YES is selected and the focus display is turned off by shifting to S-M7. If NO, the process is shifted to S-M5 and it is determined whether or not focus is achieved. If NO in S-M5, the process moves to S-M7 to turn off the focus display, and if YES to S-M6, the focus display lights up, and the process returns to A of FIG. , S2, the ON (input) of the AF mode SW (switch SWAF A / M) is judged, and if it is manual, the loop between M of FIG. 21 and A of FIG. 14 is repeated until it is turned ON.

If YES (AF operation is being performed) in S-M1 in FIG. 21 and the process moves to K in FIG. 29, the timer interrupt is disabled in S-K1 and S-K2
Move to AF STOP processing. In this AF STOP processing, the focusing lens group is being driven by the S-AS1 (see A in Fig. 40).
It is determined whether or not FGO = 1), and if it is not driven, the process proceeds to NO at S-K3 in FIG. 29 and proceeds to the ZOOM STOP process. Also,
If YES, the driving of the focusing lens group is stopped by stopping the operation of the AF mode M1, and the process moves to S-K3 to set the focusing lens group driving flag AFGO = 1 to AF.
After setting GO = 0, the process proceeds to the ZOOM STOP process of S-K3 in FIG.

In this ZOOM STOP processing, as shown in FIG. 41, it is determined in S-Z1 whether the zooming lens group is being driven (PZGO = 1). If NO, the process moves to S-Z2 and the "macro It is judged whether AF drive (auto focus drive) is performed by the power zoom mechanism (PZ mechanism) in the area. If it is not being AF driven by the PZ mechanism (PZMGO = 1), the result is NO in S in FIG. 29.
-Move to K4. If the zoom lens group is being driven by S-Z1 or the AF drive is being performed by S-Z2 (PZMGO = 1), then YES is selected and the operation of PZ motor M2 is stopped. By doing so, the driving of the zooming lens group is stopped, and the zooming lens group driving flag PZGO is set to PZGO with the S-Z4.
= 0, the flag PZMGO is set to PZMGO = 0 in S-Z5, and the process proceeds to S-K4 in FIG.

In this S-K4, the focus indicator is turned off and the process moves to S-K5. this
In S-K5, it is judged whether or not the AF mode switch (switch SWAF A / M) is input (ON). If NO, the process moves to S-K6. If YES (AF), S-K7 Move to AFFARGO processing. Then, in S-K6, the focusing lens group Far end detection flag FL and the focusing lens group Near end detection flag NL are set to FL = NL = 0, and the process proceeds to S-K12.

In the S-K7 AFFARGO, the focusing lens group is driven in the Far direction by the subroutine shown in FIG. 34 in the same manner as described above, and each AFDRVF = 1, AFGO = 1, NL = 1, FL = 1 Set the flag of and shift to S-K8 in Fig. 29.

Then, while the focusing lens group is being driven in the Far direction, a drive pulse is output from the AF pulsar 48, and this drive pulse is input to the lens CPU 44. The S-K8 determines whether this drive pulse is output from the AF pulser 48.
To do. This judgment is made when the pulse interval is 100 msec or less, and if NO (less than 100 msec) appears YES (100 msec
The above is repeated and the judgment is repeated. When this pulse interval becomes 100 msec or more, the focusing lens group is driven to the Far end and stopped, and the friction clutch that links the AF motor M1 and the focusing lens group slips. It will be awake. Therefore, when the pulse interval becomes 100 msec or more, YES (above) is entered and the AFSTO process is performed in S-K9. In this AF STOP processing, as shown in FIG. 40, the S-AS1 determines whether or not the focusing lens group is being driven (AFGO = 1). If not, NO is selected as shown in FIG. If it is YES, the operation of the AF motor M1 is stopped to stop the driving of the focusing lens group and the S-AS
Moving to 3 Focusing lens group driving flag AFGO
AFGO = 0 and shift to S-K10. In this S-K10, the Far end detection flag FL of the focusing lens group is set to FL = 1. At this time, since the focusing lens group is not at the Near end, the process proceeds to S-K11, the Near end detection flag NL of the focusing lens unit is set to NL = 0, and the process proceeds to S-K12.

At the stage of S-K12, since the focusing lens group is at the Far end, the driving pulse number Pinf from the Far end of the focusing lens group is 0, so Pinf = 0. After this,
In S-K13, the Wide end detection flag WL of the zooming lens, that is, the Tele end detection flag TL of the zooming lens group is set to WL = TL = 0. Also, with the S-K14,
Then, the far end detection flag MFL of the focusing lens group by zoom ring driving in the macro region and the near end detection flag MNL of the focusing lens group by zoom ring driving in the macro region are set to MFL = MNL = 0. In the S-K15, the image magnification constant control flag ONIMG is set to ONIMG = 0, and in the S-K16, the flag MAGIMG for starting the image magnification constant control is set to MAGIMG.
= 0, and the S-K17 sets the flag M during manual focus.
F and flag AF during autofocus are set to MF = AF = 0, and S-K18 sets autofocus correction flag AFCORR to AFC.
ORR = 0, S-K19 allows timer interrupt,
Return to S2 in the figure.

In this determination of S2, if the switch SWAF A / M for automatic / manual switching is ON and ON, YES (AF) is selected and the process proceeds to S3. In this S3, the manual focus flag MF is
It is determined whether or not MF = 1. If in focus, the process proceeds to YES with K and to NO with S4.

In this S4, it is judged whether or not the photometric switch SWS is ON, and if it is not ON, S is kept until the photometric switch SWS is turned ON.
Return to 2 and repeat the above operation. If it is ON, S
Go to 5 and set AF during autofocus to AF = 1, and then defocus amount of focusing lens group in S6.
Calculate dx and move to S7. In S7, it is determined whether or not the subject has low contrast from the amount of light from the subject incident on the light receiving element 10. If the contrast is low, YES is returned to S2 and the above-described operation is repeated until the contrast is increased.
If NO, that is, if the contrast is not low, the process proceeds to S8. In S8, it is determined whether or not the focus is achieved, and if NO (non-focus), the process proceeds to S9, and if YES (focus), the process proceeds to S21. In this S21, the image magnification constant mode switch SWPZC
Is entered (turned on) to determine whether the flag MAGIMG for starting the constant image magnification control is set, that is, whether or not MAGIMG = 1. And if the flag MAGIMG is standing, YE
At S25, the focus display is turned off at S25, and the flow shifts to B in FIG. 15. If the flag MAGIMG is not set, NO shifts to S22 and the focus display is turned on, and then the release permission flag SWREN is set to SWREN = 1.
And move to S24. In this S24, it is determined whether or not AFS = 1, that is, the switch SWAF S / C for focus / release priority switching.
Enters the S side (focus priority side) and the focus priority flag AFS = 1
Judge whether is standing or not. If YES, it loops to focus lock, and if NO, that is, AFC side (release priority side), returns to S2.

Further, if it is determined whether the focus is in S8 or not (NO in focus), the process proceeds to S9. In this S9, the release permission flag SWREN is set to SWREN =
It shifts to S10 as 0. Then, in S10, the focus display is turned off and the process proceeds to S11. In S11, the driving amount dp of the focusing lens group is calculated from the defocus amount dx obtained in S6, and the process proceeds to S12. In S12, it is determined whether or not the driving direction of the focusing lens group is the Near direction. If YES (Near direction), the process proceeds to S13, and if NO (Far direction), S18.
Move to.

At S13, whether or not the focusing lens group Near end detection flag NL is NL = 1, that is, the focusing lens group is Ne
Judge whether it is in ar Limit (Near end). When the focusing lens group is at the near limit (Near Limit) and NL = 1, the process shifts to I in FIG. 20, and when the focusing lens group is not at the near end (Near Limit) and is NO, Is S1
Move to 4. Further, in S18, it is determined whether or not the focusing lens group Far end detection flag FL is FL = 1, that is, whether or not the focusing lens group is at the Far end. When the focusing lens group is at the Far limit and FL = 1, the process moves to I in FIG. 20, and when the focusing lens group is at the Far end (Far Limit) and is NO. Shifts to S19.

Here, if the flow shifts to I in FIG. 20, in S-I1, it is judged whether or not the power zoom drivable flag PZMODE is PZMODE = 1, and NO.
If so, loop back by returning to S2 in Fig. 14 until YES.
If ES, shift to S-I2. In S-I2, it is determined whether the macro switch is turned on and the macro area flag PZMACRO is PZMACRO = 1. If NO, the process returns to S2 in FIG. 14 to loop, and if YES, the process proceeds to S-I3. In this S-I3, the focusing driving amount zdpx by the zooming lens group is calculated from the defocus amount dx described above, and the process proceeds to S-I4.
The S-I4 determines whether the focusing direction by the zooming lens group is the Far direction or the Near direction. If YES (Near direction), the process moves to S-I5. If NO (Far direction), the process moves to S-I12. To do. Then, in S-I5, the Near edge detection flag of the focusing lens group by the zoom ring drive in the macro area.
Whether MNL is MNL = 1 or not, and if YES, S2 in FIG. 14
It loops back to and if NO, shifts to MCRNEARGO processing of S-I6. Further, in S-I12, it is determined whether or not the Far end detection flag MFL of the focusing lens group by the zoom ring drive in the macro area is MFL = 1, and if YES, S in FIG.
It loops back to 2, and if NO, shifts to the MCRFARGO process of S-I13.

Then, the processing of S-I6 drives the zooming lens group in the Near direction as shown in FIG. 39, and the processing of S-I13 drives the zooming lens group in the Far direction as shown in FIG.

That is, in the process shown in Fig. 39, the PZ motor is operated by S-MNG1.
The M2 is operated to drive the zooming lens group in the Near direction, and the S-MNG2 sets the Far direction drive flag MCRDRVF of the zooming lens group in the macro area to MCRDRVF = 0 (Nea
(r direction) and set the PZMGO flag for driving the zooming lens group for focusing in the macro area with S-MNG3 to PZMGO.
= 1 (during driving), use the S-MNG4 to
Tele end detection flag TL is set to TL = 0, S-MNG5 sets the wide end detection flag WL of the zooming lens group to WL = 0, and S-MNG6 sets Ne by driving the zooming lens group in the macro area.
The ar edge detection flag MNL is set to MNL = 0, the Far edge detection flag MFL by the zooming lens group drive in the macro area is set to MFL = 0 in S-MNG7, and the process proceeds to S-I7 in FIG.

In the processing of S-I13, as shown in Fig. 38, S-MFG1
By operating the Z motor M2, the zooming lens group is driven to the Far end side, and the S-MFG2 sets the Far direction drive flag MCRDRVF of the zooming lens group in the macro area to MCRDRVF.
= 1 (Far direction), and the S-MFG3 zooming lens group driving flag PZMG for focusing in the macro area.
O is set to PZMGO = 1 (during driving), S-MFG4 sets the Tele end detection flag TL of the zooming lens group to TL = 0, and S-MNG5 sets the Wide end detection flag WL of the zooming lens group to WL = 0,
In S-MFG6, the near edge detection flag MNL by the zoom lens group drive in the macro area is set to MNL = 0, and in the S-MFG7 the far edge detection flag MFL by the zoom lens group drive in the macro area is set to MFL = 0. Move to S-I7. Incidentally, while the zooming lens group is being driven, a drive pulse is output from the PZ pulsar 49, and this drive pulse is input to the lens CPU 44.

In S-I7, it is determined whether or not the focusing driving amount zdpx by the zooming lens group obtained in S-I3, that is, whether or not the zooming lens group is zdpx-driven. Then, if it is driven, the process proceeds to S-I14 with YES, performs the ZOOM STOP processing of FIG. 46, and returns to S2 of FIG. If NO, the process proceeds to S-I8.

In S-I8, it is determined whether or not the drive pulse is output from the PZ pulsar 49. This judgment has a pulse interval of 100 m
It is performed for more than or less than sec, and if NO (less than) appears, it loops until YES (more than) and repeats the judgment. When this pulse interval becomes 100 msec or more, the zooming lens group is driven to the Far end or the Near end and stopped.
The friction clutch that links the Z motor M2 and the zooming lens group is slipping. Therefore, when the pulse interval becomes 100 msec or more, YES (or more) is selected and the process moves to S-I9 to perform the ZOOM STOP process shown in Fig. 41 and S-I1.
Move to 0. In this S-I10, it is judged whether or not the driving direction is the Near direction. If NO (Near direction), the process proceeds to S-I11 to set the Near end detection flag MNL by the zooming lens group drive in the macro area. Return to S2 in FIG. 14 with MNL = 1, and if YES (Far direction), move to S-I15 and set the Far end detection flag MFL by the zooming lens group drive in the macro area to MFL = 1 and set in FIG. Return to S2.

In addition, when shifting from S13 to S14 in FIG. 14, the focusing lens group is driven in the Near direction as shown in FIG. 35, and when shifting from S18 to S19, the focusing lens group is moved. Is driven in the Far direction as shown in FIG.

In the processing of FIG. 34, the S-AFG1 drives the focusing lens group in the Far direction, and the S-AFG2 drives the focusing lens group in the Far direction. The flag AFDRVF is set to AFDRVF =
1 (Far direction), S-AFG3 sets the flag AFGO during focusing lens group driving to AFGO = 1 (driving), and S-AFG4
Focusing lens group Near edge detection flag NL = NL
0, the focusing lens group Far end detection flag FL is set to FL = 0 in S-AFG5, and the process proceeds to S15 in FIG.

Further, in the processing of FIG. 35, the focusing lens group is driven in the Near direction by S-ANG1 to shift to S-ANG2. This S-ANG2
Then, since the driving direction of the focusing lens group is not the Far direction but the Near direction, the flag AFDRVF in which the driving direction of the focusing lens group is the Far direction is set to AFDRVF = 0 (Nea
(r direction), S-ANG3 sets the focusing AF group driving flag AFGO to AFGO = 1, S-ANG4 sets the focusing lens group Near edge detection flag NL to NL = 0, and S-ANG5 sets Focusing lens group FAr End detection flag FL is FL = 0
Then, the process proceeds to S15 in FIG.

In this S15, it is determined whether or not the focusing lens group is driven by the defocus amount dp obtained in S6. If dp is driven and YES is determined, the process proceeds to S20 and the focusing lens group AF is performed. After the drive stop processing, the focusing lens group is stopped, and the process returns to S2 and loops. If NO, the process proceeds to S16 to determine whether the drive pulse interval output from the AF pulser 48 is 100 msec or more or less, and NO (100
If less than (msec), it loops until YES (100 msec or more) and repeats the judgment. This pulse interval is 100 msec
When the above is reached, the driving of the focusing lens group is stopped, and the friction clutch that links the AF motor M1 and the focusing lens group is slipping. Therefore, when the pulse interval becomes 100 mses or more, the process proceeds to S17, AF end point processing is performed, and the process proceeds to S2.
Loop.

[AF end point processing (Fig. 23)] The end point processing of S17 is performed as shown in Fig. 23. In this process, the AF-STOP process of FIG. 40 is performed in S-AFE1 as described above to stop the driving of the focusing lens group, and the process proceeds to S-AFE2. In this S-AFE2, the number of pulses dpx driven until the focusing lens group is stopped is counted from the output of the AF pulser 48, and the process proceeds to S-AFE3. In this S-AFE3, it is judged whether the driving direction of the focusing lens group is the Far direction or not, and if it is the Far direction, YES is selected and the process proceeds to S-AFE12.
If the direction is NO, move to S-AFE4 with NO.

In this S-AFE4, the driving pulse number Pinf of the focusing lens group is calculated as the driving pulse number Pinf of the focusing lens group which is fed from the Far end by the S-AFE2.
Replace it with the value obtained by adding dpx and move to S-AFE5.

In this S-AFE5, the absolute value of the number of pulses Pnear from the number of pulses Pinf to the near end of the focusing lens group obtained in S-AFE4 to the distance from the far end to the near end of the focusing lens group Pnear | Pinf- The value obtained by calculating Pnear | is set as Plmt, and the process proceeds to S-AFE6.

In addition, in the case of end point detection, the number of pulses from the Far end to the Near end is known, so this can be set as the number of drive pulses for the focusing lens group on the Near end side. Since the lens group may stop without being driven to the Near end, it is necessary to consider this case.

On the other hand, the pulse number Pnear is a value known in advance to the lens, so if the focusing lens group hits the Near end, the result of subtracting Pinf-Pnear and taking the absolute value is obtained. Should be "0". Therefore, if the focusing lens group hits the Near end, the result of this subtraction must be "0". However, considering that some error occurs, the result of the subtraction is If is within the allowable value, it is assumed that the focusing lens group hits the end point. The pulse number Pnear is a value that is known in advance by the lens, and is stored in the lens ROM as fixed data in advance.

Therefore, in S-AFE6, it is judged whether the number of pulses at the end point is within the allowable value ε, that is, if | Pinf-Pnear | is within the allowable value ε, YES is selected and the S-AFE10 is selected. If it is outside of ε, NO is entered and S-AFE7 is entered. Here, the allowable value ε is, for example,
Like 10 pulses, within this range, it means a pulse within a range in which the focusing lens group can be driven with almost no error.
Then, in S-AFE7, processing for driving the focusing lens group in FIG. 35 to the Near end side is performed, and the process proceeds to S-AFE8.

Here, while the focusing lens group is being driven in the Near direction, a drive pulse is output from the AF pulsar 48, and this drive pulse is input to the lens CPU 44. Whether or not this drive pulse is output from the AF pulser 48 is determined by the S-AFE8. This determination is made when the pulse interval is 100 msec or more or less, and if NO (less than), the determination is repeated by looping until YES (more than), that is, until the end point is detected. When this pulse interval becomes 100 msec or more, the focusing lens group is driven to the Near end and stops, and the friction clutch that links the AF motor M1 and the focusing lens group slips. It will be in the state of being. Therefore, when the pulse interval becomes 100 msec or more, YES (or more) is selected and the S-AFE9 shifts to AFS shown in Fig. 40.
Perform TOP processing and move to S-AFE10. In this S-AFE10, the near end detection flag NL of the focusing lens group is set to NL = 1, and the process moves to S-AFE11. In this S-AFE11, Pinf = Pnear is set, and the process moves to S2 in FIG.

If YES (Far direction) is selected in the determination as to whether the driving direction of the S-AFE3 is the Far direction, the S-AFE12
Then, the focusing pulse number Pinf of the focusing lens group
Is replaced with a value obtained by subtracting the driving pulse number dpx obtained by S-AFE2 from the pulse number Pinf extended from the Far end by the focusing lens group, and the process proceeds to S-AFE13.

In this S-AFE13, the absolute value | Pinf-dpx | of the pulse number Pinf up to the Far end of the focusing lens group obtained in S-AFE12 is calculated, and the process proceeds to S-AFE14. Here, the focusing lens group may stop without being driven to the Far end for some reason, so it is necessary to detect this case.
On the other hand, if the focusing lens group hits the Far end, the value when the absolute value of Pinf, that is, the absolute value of Pinf-dPx of S-AFE12 is taken [that is, the result of subtraction of S-AFE12] is It should be "0". Therefore, if the focusing lens group hits the Far end, the result of this subtraction is "0".
However, considering some error, if this error is within the allowable value, it is assumed that the focusing lens group hits the end point.

In this S-AFE14, it is judged whether the number of pulses at the end point is within the allowable value ε, that is, if | Pinf | is within the allowable value ε, YES is selected and the process moves to S-AFE18. If there is NO,
Move to S-AFE15. Then, in the S-AFE 15, the processing for driving the focusing lens group to the Far end side in FIG. 34 is performed as described above.

Here, while the focusing lens group is being driven to the Far end side, a drive pulse is output from the AF pulsar 48, and this drive pulse is input to the lens CPU 44. Whether or not this drive pulse is output from the AF pulser 48 is determined by the S-AFE 16. This judgment is made when the pulse interval is 100 msec or more or less, and if NO (less than) appears, it loops until YES (more than), that is, until the end point is detected. When this pulse interval exceeds 100 msec,
The focusing lens group is driven to the Far end and stopped, and the friction clutch that links the AF motor M1 and the focusing lens group is slipping. Therefore, when the pulse interval becomes 100 msec or more, YES (or more) is selected and the AF-S shown in FIG.
Perform STOP processing, shift to S-AFE18, set Far end detection flag FL of focusing lens group to FL = 1, and pin Sinf in S-AFE19.
= 0, the process proceeds to S2 in FIG.

[AF drive stop (Fig. 22)] The AF drive stop processing of S20 is performed as shown in Fig. 22.
In this process, the S-AFS1 performs the AF STOP process of FIG. 40 as described above to stop the driving of the focusing lens group, and the S-AF
Move to S2. In this S-AFS2, the number of pulses dpx driven until the focusing lens group is stopped is calculated by the AF pulser 48.
It is calculated by counting from the output of, and the process moves to S-AFS3. This S-AF
In S3, it is determined whether or not the driving direction is the Far direction. If YES (Far direction), the process proceeds to S-AFS11, and if NO (Near direction), the process proceeds to S-AFS4.

In this S-AFS4, the driving pulse number Pinf of the focusing lens group is calculated by the S-AFS2 to the pulse number Pinf of the focusing lens group extended from the Far end.
Replace with the value that dpx (equivalent to dp) is added, and move to S-AFS5.

In S-AFS5, it is judged whether the number of pulses at the end point is larger (outside the range) or smaller (inside the range) than Pnear. If YES (inside the range), the process moves to S2 in FIG. If so, move to S-AFS6. Then, in the S-AFS6, as shown in FIG. 35, a process of driving the focusing lens unit in the Near direction is performed.

Here, while the focusing lens group is being driven in the Near direction, a drive pulse is output from the AF pulsar 48, and this drive pulse is input to the lens CPU 44. Whether or not this drive pulse is output from the AF pulser 48 is determined by the S-AFS7. This judgment is made when the pulse interval is 100 msec or more or less, and if NO (less than) appears, it loops until YES (more than), that is, until the end point is detected. When this pulse interval becomes 100 msec or more, the focusing lens group is driven to the Near end and stops, and the friction clutch that links the AF motor M1 and the focusing lens group slips. It will be awake. Therefore, when the pulse interval becomes 100 msec or more, YES (or more) is selected and the process moves to S-AFS8 and A
Perform FSTOP processing, move to S-AFS9, set Near end detection flag NL of focusing lens group to NL = 1, and pin on S-AFS10
With f = Pnear, the process proceeds to S2 in FIG.

In addition, if the drive direction of the S-AFS3 is the Far direction and YES (Far direction) is selected and the process moves to the S-AFS11, this S
-In AFS11, the drive pulse number Pinf of the focusing lens group is calculated by the S-AFS2 from the pulse number Pinf of the focusing lens group extended from the Far end.
Replace x with the subtracted value and move to S-AFS12.

In this S-AFS12, it is determined whether the pulse number Pinf at the end point is larger (in the range) or smaller than 0 (out of the range), and YES
If it is (in range), move to S2 in Fig. 14 and NO (outside range)
If so, move to S-AFS13. Then, in the S-AFS13, the processing for driving the focusing lens group in the Far direction of FIG. 34 is performed as described above.

Here, while the focusing lens group is being driven in the Far direction, a drive pulse is output from the AF pulsar 48, and this drive pulse is input to the lens CPU 44. Whether or not this drive pulse is output from the AF pulser 48 is determined by the S-AFS 14. This judgment is made when the pulse interval is 100 msec or more or less, and if NO (less than) appears, it loops until YES (more than), that is, until the end point is detected. When this pulse interval exceeds 100 msec,
The focusing lens group is driven to the Far end and stopped, and the friction clutch that links the AF motor M1 and the focusing lens group is slipping. Therefore, when the pulse interval is 100 msec or more, YES (or more) is selected and the process proceeds to S-AFS15. And S-AFS1
At 5, the AF STOP processing shown in FIG. 40 is performed and the process proceeds to S-AFS16. In this S-AFS16, the Far end detection flag FL of the focusing lens group is set to FL = 1, and in the S-AFS17, Pinf = 0 is set,
The process moves to S2 in FIG.

[Image magnification constant control] In S21 of FIG. 14, whether the image magnification constant mode switch SWPZC is turned on (turned on) to start the image magnification constant control as described above, that is, whether or not a flag MAGIMG is set, that is, MAGIMG
= 1 is determined. And the flag MAGIMG is MAGI
If MG = 1 and YES, the process proceeds to S25, in which the focus display is turned off and the process proceeds to B in FIG. In FIG. 15, the image magnification is controlled to be constant.

In S-B1 in FIG. 15, the ONIMG flag during constant image magnification control is on.
ONIMG = 1 (during control) and shifts to S-B2. This SB
At 2, the amount of extension of the focusing lens group from the infinite end x ₀
Is calculated and the process proceeds to S-B3. In this S-B3, the current focal length information f ₀ of the zooming lens group is input and the process proceeds to S-B4. In the S-B4, the feeding amount of x ₀ is determined whether f ₀ / 0.99 or smaller. In this determination, that whether the feeding amount x ₀ is f ₀ / 0.99 or less will become the determination whether the image magnification is not too small for the image magnification constant control, when the image magnification is too more small It becomes impossible to accurately detect a change in the image magnification due to the movement of the subject. Therefore, in such a case, YES moves to S-B18 to turn off the focus display,
S-B19 generates a control disable signal to notify that constant image magnification control is not possible, S-B20 sets the release permission flag SWREN to SWREN = 0, and S-B21 sets the image magnification constant control flag ONIMG Is set to ONIMG = 0 (during non-control), and the flab MAGIMG for starting the constant image magnification control in S-B22 is MAGIMG =
The value shifts to S2 in FIG. 14 as 0.

If the image magnification is not too small in the judgment of S-B4, NO
To move to S-B5. In this S-B5, the image magnification m ₀ = x ₀ / f ₀ is calculated, and the process proceeds to S-B6. In S-B6, the defocus amount dx is calculated and the process proceeds to S-B7. In S-B7, it is determined whether or not the subject has low contrast. If YES (low contrast), the process proceeds to S-B23 and the release permission flag SWREN is set.
Is set to SWREN = 0, the focus display is turned off in S-B24, the process proceeds to S2 in FIG. 14, and the process is looped until the contrast is not low. This is for convenience of use by continuing the constant image magnification control when the subject returns to a predetermined position on the screen again, for example, even when the subject disappears from the screen or when the contrast is shifted laterally and the contrast is lowered. This is because.

On the other hand, if NO, the flow shifts to S-B8 to determine whether or not focus is achieved. If YES (focus), it means that the contrast is correct and the subject has not moved compared to the previous time. Therefore, the process proceeds to S-B16 and the release permission flag SWR is set.
Set EN to SWREN = 1 (release enabled), move to S-B17, light the focus indicator, and return to S-B1 to loop. On the other hand, S-
If the result of B8 is NO (out of focus), the lens must be moved, so the process moves to S-B9 and the drive amount dp of the focusing lens group is calculated from the defocus amount dx to calculate S-B10.
Move to. In this S-B10, the focal length when the defocus amount dx is generated is obtained from the formula, and the process proceeds to S-B11. Here, the focal length f of the equation is f1. Here, the focal length at the Wide end of the focusing lens group is fW and TL
If the focal length at the edge is ft, f1 must be within the range of fW <f1 <ft in order to perform constant image magnification control. Therefore, in S-B11, this judgment is made. If f1 is not within the range of fW <f1 <ft, NO is selected and the flow shifts to S-B25 where the release permission flag SWREN is set to SWREN = 0 and the focus is obtained in S-B26. The display is turned off and the process moves to E in FIG. In this processing of E, f1 is fW <f1
It is a process waiting for entering <ft range.

If f1 is within the range of fW <f1 <ft according to the judgment of S-B11, Y
After moving to S-B13 in ES and obtaining the control image magnification γ = f1 / f ₀
Move to S-B13. In S-B13, constants A, B, and C for calculating the driving amount Pz of the zooming lens group are input from the lens ROM 43 to the lens CPU 44 or the main CPU 6, and the process proceeds to S-B14. In this S-B14, using the constants A, B, and C, the drive amount Pz
And calculate S-B15. And in S-B15, dp = Pz
If it is NO instead of 0, it shifts to N in FIG. If both are 0 and YES, the flow shifts to S-B16, the release permission flag SWREN is set to SWREN = 1 (release permission), the flow shifts to S-B17, the focus display is turned on and S-B1 is set.
Loop back to.

If one of dp and Pz is not 0 in the judgment of S-B15, when shifting to N in FIG. 16, first the focus display is turned off in S-N1 and then S-N2.
Then, the release permission flag SWREN is set to SWREN = 0, and the process proceeds to S-N3. In this S-N3, the driving amount of the focusing lens group
If dp is 0, it is determined to be YES, and the process proceeds to S-N9. In S-N9, it is determined whether or not the driving amount Pz of the zooming lens group is 0, and if 0, YES is selected and the process proceeds to D in FIG.

If the driving amount dp is not 0 in S-N3, the process proceeds to S-N4 with NO, and in S-N4, the driving direction of the focusing lens group is Far.
Judge whether it is the direction. And if it is Near direction, NO
Move to S-N5, and if it is Far direction, move to S-N7 with YES.
In this S-N5, it is judged whether or not the Near end detection flag NL of the focusing lens group is NL = 1, and the end point is detected and NL = 1.
If YES, the process returns to B in FIG. 15 and loops, and if NO, the process proceeds to S-N6. In S-N7, Far end detection flag FL
Determines whether FL = 1, detects the end point, and if FL = 1, returns YES to B in FIG. 15 and loops, and if NO, S-N8
Move to. Then, in this S-N6, AFFARGO processing for driving the focusing lens group in FIG. 34 in the Far direction is performed,
In S-N8, AFNEARGO processing for driving the focusing lens group in FIG. 34 in the Near direction is performed, and the process proceeds to S-N9. this
In the determination of S-N9, it is determined whether or not the drive amount Pz is 0, and if not 0, the process proceeds to S-N10 with NO. In S-N10, it is determined whether or not the driving direction of the zooming lens group is the Tele direction. If YES in the Tele direction, the process moves to S-N11 with YES to drive the zooming lens group in the Tele direction.
GO processing. Also, if it is Wide in the judgment of S-N10, N
When O is selected, the process shifts to S-N12, and the PZWIDEGO processing shown in FIG. 37 for driving the zooming lens group in the Wide direction is performed.

In the PZTELEGO processing of FIG. 36, the S-PTG1 drives the zooming lens group in the Tele direction and the S-PTG2 drives the zooming lens group.
Tele direction drive flag PZDRVF is PZDRVF = 1 (Tele direction)
And set the flag PZGO during zooming lens group drive with S-PTG3.
Set PZGO = 1 (during driving). Then, in S-PTG4 to S-PTG7, Tele edge detection flag TL, Wide edge detection flag WL, Near edge detection flag MNL by driving the zooming lens group in the macro area, Far edge detection by driving the zooming lens group in the macro area The flag MFL is set to 0, and the process proceeds to D in FIG.

Further, in the PZWIDEGO processing of FIG. 37, S-PWG1 drives the zooming lens group in the Wide direction, S-PWG2 sets the Tele direction drive flag PZDRVF to PZDRVF = 0 (Wide direction), and S-PWG3 sets the zooming lens group. The driving flag PZGO is set to PZGO = 1 (driving). In S-PWG4 to S-PWG7, Tele edge detection flag TL, Wide edge detection flag WL, Near edge detection flag MNL by driving zooming lens group in macro area, Far edge detection by driving zooming lens group in macro area The flag MFL is set to 0, and the process proceeds to D in FIG.

In the processing of FIG. 17D, since the focusing lens group is within the zoom area, the end point is not detected and it always stops somewhere. Then, only the end point detection of only the focusing lens group is determined. In the processing of FIG. 17D, "(a) both the focusing lens group and the zooming lens group are not moving, (b) only the zooming lens group is moving and the focusing lens is not moving" , (C) When the zooming lens group is stopped and only the focusing lens group is moving, (d) Both the focusing lens group and the zooming lens group are moving, and the focusing lens group comes first. And the case where (e) both the focusing lens group and the zooming lens group are moving and the zooming lens group stops first ". Hereinafter, each of these cases will be described.

[(A) Both Focusing Lens Group and Zooming Lens Group Are Not Moving] In S-D1 in FIG. 17, whether or not the focusing lens group drive flag AFGO is 1 (while driving) If YES, the process proceeds to S-D2, and if NO, the process proceeds to S-D13. With this S-D13, the zooming lens group drive flag PZGO is set to PZG.
It is determined whether O = 1 (during driving). If NO, the process proceeds to S-D16. Then, in S-D16, the focus display flag SWREN is set to 0, and in S-D17, the drive stopping process of the focusing lens group in FIG. 22 is performed, and the process proceeds to S-D18.

In this S-D18, it is determined whether or not the Far end detection flag FL of the focusing lens group is FL = 1 (end point detection), and if the end point is detected and YES, the process moves to B in FIG. Loops and moves to S-D19 if no endpoint is detected and NO. In S-D19,
Near end detection flag NL of focusing lens group is NL = 1
(End point detection) is judged, and if YES, B in FIG.
If it is NO without detecting the end point, S-D20
Move to.

In this way, if the S-D18, S-D19 is NO or NO, the image magnification has become constant, so the S-D20 will turn on the focus indicator, and the SD
In 21, the release permission flag SWREN is set to SWREN = 1 and the 15th
Return to B in the figure and loop. If YES in S-D18 and S-D19, the process returns to B in FIG. 15 and loops until the image magnification becomes constant.

[(B) When only the zooming lens group is moving but the focusing lens group is not moving] In FIG. 17, whether the focusing lens group drive flag AFGO is AFGO = 1 (driving) in S-D1 Whether YES or not is determined, the process proceeds to S-D2 if YES, and proceeds to S-D13 if NO. With this S-D13, the zooming lens group drive flag PZGO is set to PZG.
It is determined whether O = 1 (during driving). If YES, the process proceeds to S-D14. In S-D14, it is judged whether the zooming lens group is driven by the driving pulse number Pz and the driving is finished,
If NO, the process returns to S-D1 and loops until the zooming lens group is driven by the driving pulse number Pz. In this way, when the zooming lens group is driven by the number of drive pulses Pz,
If it is YES in the judgment of S-D14 (driving end), the process proceeds to S-D15. In this S-D15, the processing for stopping the zooming lens group shown in FIG. 41 is performed, and the flow shifts to S-D16. After this, S described above
-Perform the processing of D16 to S-D21, return to B of FIG. 15 and loop.

[(C) When the zooming lens group is stopped and only the focusing lens group is moving] In this case, the focusing lens group driving flag AFGO in the S-D1 is AFGO = 1 (driving) In determining whether or not
If YES (while driving), move to S-D2. In this S-D2, the zooming lens group driving flag PZGO is PZGO = 1 (driving)
It is determined whether or not, and if NO (not driving), the process proceeds to S-D4. In this S-D4, it is judged whether or not the focusing lens group has been driven by the number of pulses dp. If YES, the flow shifts to S-D12 and the AF STOP processing of FIG. Stop the Casing lens group and loop back to S-D1.

If NO in the determination of S-D4, the process proceeds to S-D5. This S-
The D5 determines whether the AF pulse output interval output from the AF pulser 48 is 100 msec or longer, and if NO (less than 100 msec), loops back to S-D1 until 100 msec or longer, then YES
If it is (100 msec or more), move to S-D6 and set AFSTO in Fig. 40.
The focusing lens group is stopped by performing the P process, and the process proceeds to S-D7.

With this S-D7, the zoom lens group driving flag PZGO is
Judge whether PZGO = 1 (during driving). If it is NO during driving, the process proceeds to S-D10, the end point process of FIG. 23 is performed, and then the process returns to B of FIG. 15 to loop.

[(D) When both the focusing lens group and the zooming lens group move and the focusing lens group stops first] In this case, in S-D1, the focusing lens group driving flag AFGO is set to AFGO. = 1 (during driving)
If YES (while driving), move to S-D2. In this S-D2, the zooming lens group driving flag PZGO is PZGO = 1 (driving)
If YES (during driving), the process proceeds to S-D3. In this S-D3, it is determined whether or not the zooming lens group has been driven by the number of drive pulses Pz and the drive has ended,
If NO, move to S-D4. In this S-D4, it is determined whether or not the focusing lens group has been driven by the number of pulses dp. If YES, then the flow shifts to S-D12 and the AF in FIG.
The focusing lens group is stopped by performing the STOP processing, and after returning to S-D1, the processing of S-D13 to S-D19 is performed.

If NO in the determination of S-D4, the process proceeds to S-D5. This S-
The D5 determines whether the AF pulse output interval output from the AF pulser 48 is 100 msec or longer, and if NO (less than 100 msec), loops back to S-D1 until 100 msec or longer, then YES
If it is (100 msec or more), move to S-D6 and set AFSTO in Fig. 40.
The focusing lens group is stopped by performing the P process, and the process proceeds to S-D7.

With this S-D7, the zoom lens group driving flag PZGO is
Judge whether PZGO = 1 (during driving). Then, if YES during driving, the process proceeds to S-D8. In this S-D8, based on the pulse output from the PZ pulsar 49, it is determined whether or not the zooming lens group has been driven by the drive pulse number Pz and the drive has ended, and if NO, until the drive ends. If looped and YES, the flow shifts to S-D9, the zooming lens group stop process shown in FIG. 40 is performed, and the flow shifts to S-D10. In S-D10, the end point processing shown in FIG. 23 is performed, and then the processing returns to B in FIG. 15 and loops.

[(E) When both the focusing lens group and the zooming lens group move and the zooming lens group stops first] In this case, the focusing lens group driving flag AFGO of S-D1 is AFGO = 1. In determining whether (driving) or not,
If YES (while driving), move to S-D2. In this S-D2, the zooming lens group driving flag PZGO is PZGO = 1 (driving)
If YES (during driving), the process proceeds to S-D3. In this S-D3, it is determined whether or not the zooming lens group has been driven by the number of drive pulses Pz and the drive has ended,
If YES, the flow shifts to S-D11, the zooming lens group stop process of FIG. 41 is performed, and the flow shifts to S-D4.

In this S-D4, it is determined whether or not the focusing lens group has been driven by the number of pulses dp. If YES, the process proceeds to S-D12 and the AF STOP processing shown in FIG. 40 is performed to perform the focusing lens. Stop group and return to S-D1. When this AF STOP processing is performed, the focusing lens group drive flag AFGO becomes 0.
Therefore, the judgment of S-D1 is NO and the above-mentioned S-D13
~ Perform the processing of S-D21.

If NO in the determination of S-D4, the process proceeds to S-D5. This S-
The D5 determines whether the AF pulse output interval output from the AF pulser 48 is 100 msec or longer, and if NO (less than 100 msec), loops back to S-D1 until 100 msec or longer, then YES
If it is (100 msec or more), move to S-D6 and set AFSTO in Fig. 40.
The focusing lens group is stopped by performing the P process, and the process proceeds to S-D7.

With this S-D7, the zoom lens group driving flag PZGO is
Judge whether PZGO = 1 (during driving). If it is NO during driving, the process proceeds to S-D10, the end point process of FIG. 23 is performed, and then the process returns to B of FIG. 15 to loop.

In the determination of S-B11 in the process of B of FIG. 15 described above, if the process shifts to S-B25 and S-B26, then the process shifts to E of FIG. In this E, when the constant image magnification control is out of the zoom area, "it is preferable for the next processing to move the zooming lens group to the end point rather than in the middle", so this determination is made.

And first, whether the zooming lens group is the wide end or the Tele end
Determined using f1. Moreover, since f1 is smaller than fw when f1 is smaller than ft, the magnitude relationship between f1 and ft and f1 and fw
It is possible to determine the magnitude relationship between f1 and fw at the same time by determining only the magnitude relationship between f1 and ft, without determining both magnitude relationships of.

Therefore, in S-E1 in FIG. 18, it is determined whether f1 is equal to ft or f1 is greater than ft. If f1 is equal to ft or f1 is greater than ft, the Tele end side is selected. Yes, so move to S-E2 with YES, and if f1 is smaller than ft, Wide
Since it is on the edge side, NO moves to S-E13.

On the S-E2, the Tele edge detection flag TL of the zooming lens group
Whether or not TL = 1 (end point detection) is determined. If the end point is detected, the process proceeds to S-E7 with YES, and to S-E3 if NO.
In this S-E3, the processing for driving the zooming lens group shown in FIG. 36 to the Tele direction is performed, and the process proceeds to S-E4. This S-E4 is a process of continuously waiting for the end point detection of the zooming lens group. Then, if NO (less than 100 msec), the drive ends and loops until YES, and if YES (100 msec or more), the process proceeds to S-E5 to perform the ZOOM STOP processing of FIG. 41 to perform the zooming lens. Stop the group drive and press S-
Move to E6. In this S-E6, the zoom lens Tele
The edge detection flag TL is set to TL = 1 and the process proceeds to S-E7.

Then, when S-E2 or S-E6 is transferred to S-E7, this S-E7
Then, the defocus amount dx of the focusing lens group is calculated and the process proceeds to S-E8. In S-E8, it is determined whether or not the subject has low contrast. If YES in low contrast, the process loops until there is contrast, and if there is contrast, NO is selected and the process proceeds to S-E9. In this S-E9, the amount of extension X ₀ of the focusing lens group is calculated and the process proceeds to S-E10.
At 10, Xf = ft · m ₀ is calculated and the process moves to S-E11.

In S-E11, it is determined whether or not the subject is within the focal length of the image magnification m ₀ previously obtained, depending on whether dx + X ₀ is larger than Xf obtained in S-E10. Then, if it is within this focal length as a result of this determination, the process proceeds to S-E12 with YES, f ₀ is replaced with ft in S-E12, and then the process proceeds to S-B9 in FIG. 15 to start driving.
If the subject is farther than the focal length as determined by S-E11, NO is selected and the process shifts to P in FIG.

On the other hand, in the judgment of S-E1, if f1 is smaller than ft and is on the WL end side and the process shifts to S-E13 with NO, first, in S-E13, the wide end detection flag WL of the zooming lens group is WL = 1. (End point detection) is determined. In this determination, if the end point is detected, the process proceeds to S-E18 with YES, and to S-E14 if NO. In this S-E14, the processing for driving the zooming lens group in FIG. 37 in the Wide direction is performed, and the flow shifts to S-E15.
This S-E15 is a process of continuously waiting for the zooming lens group to detect an end point. If NO (less than 100 msec), loop until the driving ends and becomes YES, YES
If it is (100 msec or more), move to S-E16 and move to ZOOM in Fig. 41.
By performing the STOP processing, the driving of the zooming lens group is stopped and the process proceeds to S-E17. With this S-E17, the Wide end detection flag WL of the zooming lens group is set to WL = 1, and the S-E1
Go to 8.

Then, when S-E13 or S-E17 is moved to S-E18, this S
-At E7, the defocus amount dx of the focusing lens group is calculated, and the process proceeds to S-E19. In S-E19, it is determined whether or not the subject has low contrast. If the low contrast is YES, the process loops until there is contrast, and if there is contrast, the process proceeds to S-E20 with NO. In this S-E20, the amount of extension X ₀ of the focusing lens group is calculated, and the flow shifts to S-E21.
-At E21, Xn = fw · m ₀ is calculated, and the process proceeds to S-E22.

In this S-E22, depending on whether dx + X ₀ is smaller than Xn,
It is determined whether or not the subject is within the focal length of the image magnification m ₀ obtained last time. If the focal length is within this focal length as determined by this S-E22, YES is selected, and then S-E23 is used to replace f ₀ with fw, then S-B9 shown in Fig. 15 is started and driving is started. To do. If the subject is closer than the focal length in the determination of S-E22, NO is selected and the flow shifts to P in FIG.

In S-P1 in FIG. 19, the driving amount dp of the focusing lens group is calculated from the defocus amount dx, and the process proceeds to S-P2.
In this S-P2, the driving direction of the focusing lens group is Fa
Whether it is the r direction or not is determined. If NO (Near direction), the process proceeds to S-P3, and if YES (Far direction), the process proceeds to S-P9. this
On the S-P3, the near edge detection flag NL of the focusing lens group
Determines whether NL = 1, and if the end point is detected, YES with S
-Move to P8, and if NO, move to S-P4. Also, S-P9
Then, the Far end detection flag FL of the focusing lens group is FL
= 1 is judged, and if the end point is detected, YES is selected and S-P10
If NO, S-P4. Then, in S-P4, processing for driving the focusing lens group in FIG. 35 in the Near direction is performed, and in S-P10, processing for driving the focusing lens group in FIG. 34 in the Far direction is performed, and S -Move to P5.

In this S-P5, it is determined whether or not the focusing lens group has been driven by the driving amount dp. If the driving is completed, the process proceeds to S-P11 with YES, and to S-P6 with NO. Transition. With this S-P6, the pulse interval output from the AF pulser 48 is
Whether it is 100 msec or more is determined. If NO (less than 100 msec), the process returns to S-P5 to loop, and if YES (100 msec or more), the process proceeds to S-P7. In this S-P7, the AF end point process of FIG. 23 is performed and the process proceeds to S-P8. In S-P11, the AF drive stop process of FIG. 22 is performed and the process proceeds to S-P8. Then, in S-P8, it is determined whether or not the zoom lens group Tele end detection flag TL is TL = 1. If the end point is detected, YES is selected and the process proceeds to S-E7 in FIG. 18, and NO is selected. Move to G in FIG. 18 and repeat the same.

[Timer interrupt processing (Fig. 24)] Disable the timer interrupt in S-T1 in Fig. 24 and proceed to S-T2. For S-T2, AF mode switch (switch SWAF A / M)
Is input (ON) and it is determined whether or not it is in AF mode, and YES (AF
If it is mode), it shifts to S-T3, and if it is NO (manual), it shifts to S-T15. In S-T15, it is determined whether or not the power zoom mode switch SWPZ is ON. If it is ON, YES is selected and the process proceeds to S-T16, and if OFF, the process is NO to S-T19. Then, in S-T16, the power zoom drivable flag PZMODE is set to PZMODE = 1 (drivable), and in S-T19, the power zoom drivable flag PZMODE is set to PZMODE = 0 (drivable), and the process proceeds to S-T17. In S-T17, it is determined whether or not the auto-focusing flag AF is AF = 1 (during auto-focusing). If YES, the process proceeds to K in FIG. 29, and if NO, the process proceeds to S-T18. At S-T18, the power zoom drive check of FIG. 27 is performed, and the flow shifts to H of FIG. 25.

In S-H1 in Fig. 25, it is judged whether or not the release switch SWR is ON, and if it is ON, YES is selected and the process moves to S-H2 and ON.
If not, move to S-H12 with NO. Then, the S-H12 performs the lens storage check process of FIG. 31 and shifts to the S-H13, the S-H13 performs the power zoom drive check of FIG. 27 and shifts to the S-H14, and the S-H14 Allow the timer interrupt and finish the timer interrupt process.

Also, when it is determined that the release switch SWR is ON in S-H1 and the process moves to S-H2, the manual focus flag MF is MF = 1 (in manual focus) in this S-H2.
It is determined whether or not. Then, if the manual focus is in progress, YES is selected and the process moves to S-H5, and if NO is selected, the process moves to S-H3. In this S-H3, it is determined whether or not the focus / release priority switch SWF S / C is in focus priority (AFS), and if it is in focus priority (AFS), YES is selected and the process moves to S-H4. , Release priority (AF
If it is C), move to S-H11 with NO. In this S-H11, it is judged whether or not the image magnification constant flag ONIMG is ONIMG = 1 (while the image magnification is constant). If the image magnification is constant, YES is selected and the process proceeds to S-H4. -Move to H5. Further, in S-H4, it is determined whether or not the release permission flag SWREN is SWREN = 1 (release permission). If YES, the process proceeds to S-H5 with YES, and if NO, S-H12 to S-H14. Then, the timer interrupt processing is ended.

Then, in the S-H5, the focusing lens group driving flag
It is determined whether AFGO is AFGO = 1 (during driving). If the driving is in progress, YES is selected and the process proceeds to S-H6. If NO, the process proceeds to S-H10.
In this S-H6, the AF STOP processing shown in Fig. 40 is performed to stop the driving of the focusing lens group and shift to S-H7. In the S-H7, the focusing lens group is driven until it is stopped. The pulse number dpx is counted from the output from the AF pulser 48, and the process proceeds to S-H8. With this S-H8, the Far direction drive flag AFDRVF of the focusing lens group is AFDRVF.
= 1 (Far direction), if YES, YES
Then, S-H15 is entered, and if NO, S-H9 is entered. Then Pinf is replaced with Pinf-dpx in S-H15 and Pin in S-H9.
Replace f with Pinf + dpx and move to S-H10. This sh
In 10, the drive of the zooming lens group is stopped by performing the ZOOM STOP processing of FIG. 41, and the processing shifts to the release processing of Q ′ in FIG.

[Release process Q '(Fig. 26)] In the release process of Fig. 26, when the drive mode is the continuous release mode (drive C) and the focus priority mode is set, the release switch SWR is turned on / off. Instead, the re-AF and constant image magnification control are performed before the release is permitted. That is, AF is performed by the processing of SQ'5 and SQ'6.
The release process is performed by determining the mode, focus priority mode, or the like.

In SQ'1 of FIG. 26, the release process is performed to release the shutter of the camera to shift to SQ'2. In SQ'2, the lens accommodation check process of FIG. 31 is performed to shift to SQ'3. In this SQ'3, the up switch SWUP or the down switch SWDO is operated while operating the drive switch SWDRIVE.
The drive mode can be changed to drive C by operating WN.
That is, either the continuous release mode (the mode in which the release process is continuously performed) or the drive S, that is, the single release mode (the mode in which the release process is performed only once) is input to shift to SQ'4. In this SQ'4,
Whether the drive mode is the drive S or not is determined. If the drive mode is the drive C, the process proceeds to NO to SQ'5, and if the drive mode is YES to the SQ'7.

In this SQ'7, it is judged whether or not the release switch SWR is ON, and if it is ON, YES is returned to SQ'2 and turned OFF.
It loops until it does, and if it is OFF, it will shift to SQ'9 with NO.

In SQ'5, the AF mode switch (switch SWAF
It is determined whether or not (A / M) is input (ON). If it is ON, YES (AF mode) is used to move to SQ'6. If it is OFF, NO (manual) is used to SQ'8. Transition. SQ'6
Then, determine whether the switch SWF S / C for focus / release priority switching is in focus priority (AFS). If focus priority is set, YES
Then, the process proceeds to SQ'9, and if NO, the process proceeds to SQ'8.

Then, in SQ'8, it is judged whether or not the release switch SWR is ON, and if it is ON, the answer is YES to SQ'1.
It loops until it is turned off and the release process is performed continuously.
If it is FF, NO is selected and the process proceeds to SQ'9.

In this SQ'9, the release permission flag SWREN is set to SWREN = 0
And shift to SQ'10. In SQ'10, it is determined whether or not the autofocus flag AF is AF = 1 (autofocus is in progress). If autofocus is in progress, YE
If S, SQ'11 is entered, and if NO, SQ'13 is entered.
In SQ'11, the constant image magnification control flag ONIMG is turned on.
It is determined whether or not IMG = 1 (during constant image magnification control). If not under control, the process proceeds to SQ'12 with NO, and if under control YES
Then shift to SQ'13. Then, in SQ'12, the timer interrupt is permitted and the process returns to B in FIG. In SQ'13, the timer interrupt is enabled and the process returns to S2 in FIG.

In this way, in the case of manual judgment by S-T2 in Fig. 24,
S-T15 to S-T18 and K in Fig. 29, H in Fig. 25, Q'in Fig. 26
Process. Also, if the AF mode switch (switch SWAF A / M) is OFF in the judgment of S-T2, S will be NO (AF).
-Move to T3.

In this S-T3, it is determined whether or not the focus priority mode is set, and if it is the focus priority mode, the process proceeds to S-T20. And this ST
At 20, the focus priority mode flag AFS is set to AFS = 1 (focus priority) and the process proceeds to S-T7. On the other hand, if it is determined in S-T3 that the focus priority mode is not set, the process proceeds to S-T4 with NO. In this S-T4, the focus priority mode flag AFS is set to AFS = 0 and S-
Move to T5. In this case, since release is possible at any time, the release permission flag SWREN is set to SWREN = 0 in S-T5, and then the process proceeds to S-T6. This SWREN = 0 is set so that AF processing is performed again even if the focus is moved midway after focusing. That is, even if the focus is once obtained in the focus priority mode, the focus state cannot always be detected, and if the mode is changed to another mode, the AF process needs to be performed again.

In addition, there is a photographing lens that is out of focus when the zoom lens group is driven to zoom after focusing. There is a varifocal lens as this photographing lens. With this varifocal lens, when the zooming lens group is driven to zoom, the focus shifts, so it is necessary to correct this focus shift. For this reason, in the focus priority mode, it is necessary to set this flag AFCORR to AFCORR = 1 and perform AF again. However, since the focus priority mode is not set here, the focus shift correction flag AFCORR is 0 in S-T6.
Then shift to S-T7.

In this S-T7, it is judged whether or not the metering switch SWS is ON, and if it is ON, YES is selected and the AF bit is not checked before ST.
Go to 9 and if not ON, go to S-T8 with NO and check the AF bit. In this S-T8, it is determined whether or not the auto-focusing flag AF is AF = 1 (during auto-focusing). If auto-focusing is in progress, YES is selected and control proceeds to L in FIG. Move to T9.

In S-L1 in Fig. 30, first disable the timer interrupt and
The process shifts to L2, and in S-L2, the focusing lens group is stopped by performing the AF STOP process of FIG. 40, and the process shifts to S-L3. In this S-L3, the constant image magnification control flag ONIMG is ONI
It is determined whether MG = 1 (during constant image magnification control). If not under control, the process proceeds to S-L7 with NO. If it is under control, YES with SL.
Move to 4. In this S-L4, the zooming lens group is stopped by performing the ZOOM STOP process shown in FIG. 41, and the process proceeds to S-L5. Further, in S-L5, the flag MAGIMG for starting the constant image magnification control is set to MAGIMG = 1 (control start), and S-L5
Move to L6, and in S-L6, set the image magnification constant control flag ONIMG to O
Set NIMG to 1 (during constant image magnification control) and move to S-L7.
In this S-L7, the release permission flag SWREN is set to SWREN = 0 (non-permission) and the process proceeds to S-L8. In the S-L8, the AF correction flag AFCO
Set RR to AFCORR = 0 and move to S-L9.
The AF drive processing is performed and the process proceeds to S-L10. In S-L10, the timer interrupt is enabled and the process returns to S2 in FIG.

On the other hand, when shifting from S-T8 to S-T9, in this S-T9, it is judged whether or not the power zoom switch SWPZ is ON,
When it is OFF, it shifts to S-T21 with NO, and when it is ON, it shifts to S-T10 with YES. Then, in S-T10, the power zoom driving flag PZMODE is set to PZMODE = 1 (during driving), and the flow shifts to S-T11. In S-T21, the power zoom driving flag is set.
Set PZMODE to PZMODE = 0 and move to S-T22. This S-T22
Then, the ZOOM STOP process shown in Fig. 41 is performed and the process moves to S-T23.

Here, regardless of whether the zoom switch SWPZ is ON or OFF, there is a possibility that the zooming lens group is manually moved and is in the macro area. Moreover, the zooming lens group is drive-controlled regardless of whether the zooming lens group is in the zoom region or in the macro region, but the drive control method differs depending on the region. Therefore, in S-T11 and S-T23, the macro switch is ON.
Make them judge whether they are doing or not.

In this judgment of S-T23, if the macro switch SWPZC is ON, YES is selected and the process moves to S-T24. If not, S-T25 is NO.
Move to. In this S-T24, set the macro area flag PZMACRO
Set PZMACRO = 1 (macro area), and in the S-T25, set the macro area flag PZMACRO to PZMACRO = 0 (zoom area).
Process H in FIG. 25 is performed.

Also, if the macro switch is ON in the judgment of S-T11, YES
Press to move to S-T26, and if not ON, move to S-T12 with NO. In S-T26, the previous macro area flag PZMACRO is set to PZMA.
If CRO = 1 (macro area), determine if it is a macro area, move to S-T30 with YES, and if it is outside the macro area
NO transfers to S-T27. With this S-T27, set the Near edge detection flag MNL by driving the zooming lens group in the macro area to M.
After setting NL = 0, the process proceeds to S-T28, and in S-T28, the far end detection flag MFL by the zooming lens group drive in the macro area is set.
To S-T29 with MFL = 1, and in S-T29, set macro area flag PZMACRO to PZMACRO = 1 (macro area) to S-T3.
Move to 0. Since the image magnification constant control cannot be performed in this macro area, the flag MAGIMG for starting the image magnification constant control is set in S-T30 to S-T31 with MAGIMG = 0. In this S-T31, the constant image magnification control flag ONIMG is turned on.
Judges whether IMG = 1 (during control), and YES if control is in progress
Then, the process proceeds to L in FIG. 30 to stop the constant image magnification control, and if not under control, the process proceeds to S-T32 with NO. In this S-T32,
The power zoom drive check in FIG. 27 is performed, and the flow shifts to H in FIG. 25 to perform the release process.

Also, when the S-T11 is shifted to the S-T12, the previous macro area flag PZMACRO is PZMACRO = 1 (macro area) in the S-T12 as well.
If it is in the macro area, YES in S-T33.
If it is outside the macro area, NO is selected and the process moves to S-T13. Then, in the S-T33, the macro area flag PZMACRO is set to PZMA.
CRO = 0 (outside the macro area, that is, the zoom area), and the processing shifts to K in FIG.

When the operation shifts from S-T12 to S-T13, it is determined in this S-T13 whether the image magnification constant mode switch SWPZC is ON. If it is not turned on, the answer is NO with the above-mentioned S-T30, S-T31.
Processing is performed to shift to L in FIG. 30 and the constant image magnification control is stopped. If it is ON and YES, the process moves to S-T14, and in this S-T14, the macro area flag PZMACRO is set to PZMACR.
Set O = 1 and proceed to H in FIG. 25 to perform release processing.

[Power zoom drive check (Fig. 28)] With the S-PD1 in Fig. 27, the power zoom mode switch SWPZ
Is turned on and the power zoom drivable flag PZMODE is PZMODE =
It is determined whether it is 1 (drivable), and if drivable, YES
Then, the operation shifts to S-PD2, and if it cannot be driven, the operation shifts to S-PD7 with NO. In this S-PD7, it is determined whether or not the zooming lens group is driven by the power zoom mechanism, that is, whether or not the zooming lens group drive flag PZGO is PZGO = 1 (driving), and if it is not driving. The process proceeds to the step next to the step in which the power zoom drive check process is performed, and if it is being driven, YES is selected and the process proceeds to S-PD8. this
In S-PD8, the ZOOM STOP processing of FIG. 41 is performed to stop the zooming lens group, and the flow proceeds to S-PD17.

Also, depending on the judgment of S-PD1, the power zoom drivable flag PZM
If ODE is PZMODE = 1 (drivable), the result is YES and the process proceeds to S-PD2. In this S-PD2, the ONIMG flag during constant image magnification control
Is ONIMG = 1 (during control), and if it is under control, the result is YES and the process proceeds to the step next to the step where the power zoom drive check process is being performed, and if NO, S-
Move to PD3. In this S-PD3, it is determined whether or not the AF drive flag PZMGO by the power zoom mechanism in the macro area is PZMGO = 1 (during driving), and if it is during driving, the power zoom driving check process is performed with YES. The process proceeds to the step next to the step. If NO, the process proceeds to S-PD4.

With this S-PD4, it is determined whether the zoom switch SWPZW that drives the zooming lens group in the Wide direction is ON, and if it is ON, the operation proceeds to S-PD5 with YES, and if NO with S-PD
Go to 9. In this S-PD9, the zooming lens group
Determine whether the zoom switch SWPZT that drives in the le direction is ON. If it is ON, move to S-PD10 with YES and NO.
If so, move to S-PD7. In S-PD5, it is judged whether the zooming lens group driving flag PZGO is PZGO = 1 (driving). If it is not driving, NO moves to S-PD22. If it is driving, YES is selected. -Move to PD6. In the S-PD10 as well, the zooming lens group driving flag PZGO is PZGO = 1 (driving).
If it is not driven, the process proceeds to S-PD22 with NO, and if it is driven with YES, the process proceeds to S-PD11.

Then, when the zoom switch SWPZW for driving the zooming lens group in the Wide direction is turned on and the zooming lens group is driven, it is inconsistent with the zooming lens group moving to the Tele side. Therefore, S-PD
In 6, the zooming lens group Tele side driving flag PZDRV
It is judged whether T is PZDRVT = 1 (driving to Tele side). If it is driving to Tele side, it is inconsistent. In this case, YES is selected and S-PD8 is entered, and the zooming lens group is selected. ZOOM STOP processing to stop.

Further, when the zoom switch SWPZT for driving the zooming lens group in the Tele direction is turned on and the zooming lens group is driven, it is inconsistent with the zooming lens group moving to the Wide side. Therefore, even in the S-PD11, the Tele side driving flag PZDRVT of the zooming lens group is PZDRVT.
= 1 (driving to Tele side) is judged, and if driving to Wide side, it is inconsistent. In this case, NO in this case S-PD
Move to 8 and stop the zooming lens group ZOOMSTO
Let P process.

On the other hand, if it is not driven to the Tele side according to the judgment of S-PD6, there is no contradiction, so in this case NO transfers to S-PD12 or S-PD12.
If it is not driving to the Wide side according to the judgment of 11, that is, if Tele is driving immediately, there is no contradiction. Therefore, also in this case, YES is selected and S-PD12
Move to. This S-PD12 judges whether the pulse interval output from the PZ pulsar 49 is 100 msec or more,
If it is less than ec, NO is selected and the process proceeds to the step next to the step in which the power zoom drive check processing is being performed, and 100 m
If sec or more, YES is selected and the process proceeds to S-PD13. In this S-PD13, the zooming lens group is stopped by performing the ZOOM STOP process of FIG. 41, and the process proceeds to S-PD14. This S-PD14
Then, the Tele side driving flag PZDRVT of the zooming lens group
Is PZDRVT = 1 (driving to Tele side), and if it is driving to Tele side, the process proceeds to S-PD16 with YES, and Tel
If it is driving to the Wide side instead of the e side, move to S-PD15 with NO. Then, in the S-PD15, the Wide end detection flag WL of the zooming lens group is set to WL = 1, and in the S-PD16, the Tele end detection flag TL of the zooming lens group is set to TL = 1, and the process proceeds to S-PD17.

Also, when S-PD5, S-PD10 is moved to S-PD22, this S-PD5
At 22, the AF correction flag AFCORR is set to AFCORR = 0 and the process proceeds to S-PD23. In this S-PD23, the power zoom drive switch, that is, the zoom switch SWPZT or SWPZW
Judging whether it is driven in the e side or the Wide side, and if the zoom switch SWPZT is ON, S-PD26
If the zoom switch SWPZW is ON, the S-PD24
Move to.

Then, the S-PD24 determines whether the Wide end detection flag WL of the zooming lens group is WL = 1, and the S-PD26 determines whether the Tele end detection flag TL of the zooming lens group is TL = 1. If YES, the process proceeds to the step next to the step in which the power zoom drive check process is performed. If NO in the judgment of S-PD24 and S-PD26, S-PD24 and S-PD26 respectively
Move to PD25 and S-PD27.

Then, in the S-PD25, the zoom lens group is driven in the Wide direction by performing the PZWIDEGO processing shown in FIG.
The PZTELEGO process shown in the figure is performed to drive the zooming lens group in the Tele direction, and the process proceeds to S-PD28.

With this S-PD28, the autofocus flag AF is AF = 1.
It is determined whether or not (during autofocus), and if it is during autofocus, the process proceeds to YES with S-PD29. Then, in this S-PD29, it is judged whether or not the switch SWF S / C for focus / release priority switching is in focus priority (AFS), and if it is in focus priority, the process proceeds to S-PD30 with YES. Further, in this S-PD30, it is determined whether or not the release permission flag SWREN is SWREN = 1 (release permission), and if release is permitted, S-PD
Go to 31. Moreover, in this S-PD31, the lens ROM43
It is determined whether the taking lens 3 is a varifocal lens based on the information stored in
If YES, move to S-PD32. On the other hand, if the result of the determination in S-PD28 to S-PD31 is NO, the process proceeds to the step next to the step in which the power zoom drive check process is performed.

When shifting from S-PD31 to S-PD32, this S-PD32 stores the focal length PZSTARTF at the start of driving the zooming lens group and shifts to S-PD33.
N is set to SWREN = 0 (release not allowed) and the process proceeds to the S-PD35. In this S-PD35, the AF correction flag AFCORR is set to AFCORR = 1, and the step next to the step in which the power zoom drive check process is performed is performed. Transition.

Also, when the S-PD8 or S-PD15, S-PD16 shifts to S-PD17, in this S-PD17, the auto-focusing flag AF is AF =
It is determined whether or not it is 1 (during autofocus), and if it is during autofocus, the process proceeds to S-PD18 with YES. Then, in this S-PD18, it is judged whether or not the switch SWF S / C for focus / release priority switching is in focus priority (AFS), and if it is in focus priority, the process proceeds to S-PD19 with YES. Also, with the S-PD19, AF
It is determined whether the correction flag AFCORR is 1 or not, and if YES, the process proceeds to S-PD20. In this S-PD20, the focal length PZENDF at the time of stopping the driving of the zooming lens group is memorized
Go to R in the figure or S2 in FIG. On the other hand, S-PD17 to S-PD
If NO in the determination in 19, the process proceeds to the step following the step in which the power zoom drive check process is performed.

In the S-R1 of FIG. 28, the correction value PSTRT corresponding to the focal length PZSTART at the time of driving the zoom lens group is set to the lens ROM43.
Read from the S-R2, and in the S-R2, the correction value PE corresponding to the focal length PZENDF when the zooming lens group is stopped
Read ND from the lens ROM43 and move to S-R3. This correction value is the amount of focusing deviation due to driving of the zooming lens group when a varifocal lens is used as the taking lens. That is, the deviation amount (correction value) is, for example, as shown in Table 2 below.

Such a correction pulse (correction value n) can be changed by the lens design, and also changes depending on which of the reference values 0 is set to n _{1 to} n ₁₁ .

Then, when shifting from S-R2 to S-R3, in S-R3, the correction value PSTRT when the zooming lens group is driven and the correction value PE when the zooming lens group is stopped after this driving
In order to see how much it is different from ND, the correction value PSTR
Calculate the subtraction result AFCR by subtracting the correction value PEND from T, and enter SR
Move to 4. In this S-R4, it is judged whether or not the subtraction result AFCR is "0", and if it is 0, it means that the subject is in focus, so YES is selected.
If it is not 0, then it is not in focus, so it moves to S-R5. Then, in S-R15, set the release permission flag SWREN.
SWREN = 1 is set and the flow shifts to S-R16. In S-R16, the focus display is turned on and the flow shifts to the step next to the step where the power zoom drive check process is performed.

If the subtraction result AFCR shifts to S-R5 instead of 0 in the judgment of S-R4, the subtraction result AFCR is set to dp as the focusing lens group drive amount in S-R5. In this case, since the drive amount is an absolute value, dp = | AFCR | and S-R6 is entered. This S-
R6 determines whether the subtraction result AFCR is positive or negative.
If YES, move to S-R8, and if NO, move to S-R7.
Then, in the S-R7, the AF NEARGO process is performed in Fig. 35 to drive the focusing lens group to the Near side, and in the S-R8, the AF is performed in Fig. 34.
FARGO processing is performed to drive the focusing lens group to the Far end side, and the process proceeds to S-R9.

In this S-R9, it is judged whether or not the focusing lens group is driven by the driving amount dp, and if the driving is not completed and NO is selected, the process proceeds to S-R10, and if YES is selected in S-R12. Move to. Then, in this S-R10, it is determined whether the interval of the pulse output from the AF pulser 48 is 100 msec or more, and 100 ms
If it is less than ec, NO is returned to S-R9 to loop. And
If the pulse interval is 100 msec or more as judged by S-R10, S-R1
Move to 1. This S-R11 performs the end point processing shown in Fig. 23,
At R12, the AF drive stop process shown in FIG. 22 is performed, and the process proceeds to S-R13.

In this S-R13, it is determined whether or not the Near end detection flag NL of the focusing lens group is NL = 1. If NO, the process proceeds to S-R14. With this S-R14, the focusing lens group Near
It is determined whether the end flag NL is NL = 1. If NO, S-R15
Move to. Then, in the S-R15, the release permission flag SWR
Set EN to SWREN = 1 and move to S-R16. In S-R16, the focus display is turned on and the process proceeds to the step next to the step in which the power zoom drive check process is performed. Also,
If YES in the determinations in S-R13 and S-R14, the processes in S-R15 and S-R16 are similarly performed, and the process proceeds to the next step in which the power zoom drive check process is performed.

[Lens storage check (Fig. 31)] In the S-LC1 of Fig. 31, it is judged whether the main switch (switch), that is, the lock switch SWLOCK is ON, and if it is ON, the power zoom drive check is made with YES. The process proceeds to the step next to the step in which the process is performed. If NO, S-LC2 prohibits timer interrupt and shifts to S-LC3. In this S-LC3, the focusing lens group is stopped by performing the AF STOP processing shown in Fig. 40, and the process moves to S-LC4.
Then, by performing the ZOOM STOP processing shown in FIG. 41, the zooming lens group is stopped and the process proceeds to S-LC5. This SL
In C5, it is judged whether the AF mode switch (switch SWAF A / M) is ON, and if it is ON and it is AF, YES is selected. S-LC6
If NO (manual), move to S-LC14. Also, in the S-LC6, it is judged from the information stored in advance in the lens ROM 43 whether or not the focusing lens group is a storable type.
Move to C8, and if NO, move to S-LC14.

In this S-LC14, it is judged whether or not the switch SWPZ for power zoom is ON, and if it is ON and YES, S-LC15
Move to. Further, in the S-LC15, it is determined whether or not the zooming lens group is a type that can be stored based on the information stored in the lens ROM 43 in advance, and if the type can be stored, YE
S to S-LC11. On the other hand, if the switch SWPZ for power zoom is OFF and NO according to the judgment of S-LC14, or S
-N, not the type that can store the zoom lens group with LC15
If it is O, the process moves from V in FIG. 32 to S-U18, and the power hold is released at S-U18, and the process ends.

When shifting from S-LC6 to S-LC7, in S-LC7 the focusing lens group is driven in the retracted direction to shift to S-LC8, and in S-LC9 the focusing lens group drive flag AFG
O is set to AFGO = 1 and the process moves to S-LC9. In this S-LC9,
It is determined whether or not the power zoom switch SWPZ is ON, and if it is ON and YES, the process proceeds to S-LC10. In this S-LC10, it is determined from the information stored in advance in the lens ROM 43 whether or not the zooming lens group is a type that can be stored, and if it is possible, the process proceeds to S-LC11 with YES. In this S-LC11, the zooming lens group is driven in the retracting direction to shift to S-LC12, and in S-LC12, the zooming lens group driving flag PZGO is set to PZGO = 1 and shifts to S-LC13.

On the other hand, the switch SWPZ for power zoom is set to O by the judgment of S-LC9.
If the result is FF and NO, or if the S-LC10 is a type in which the zooming lens group cannot be stored and is NO, the process proceeds to S-LC13. And from S-LC12 or S-LC9, S-LC10 to S-
When the process shifts to LC13, the S-LC13 activates the maximum storage time timer of the lens stored in the lens ROM 43 in advance, and shifts to U in FIG.

In FIG. 32, it is determined in S-U1 whether the focusing lens group driving flag AFGO is AFGO = 1 (driving). If not driving, the process proceeds to S-U7 with NO, and driving is in progress. Then YES and S
-Move to U2. In this S-U2, it is judged whether or not the AF mode switch (switch SWAF A / M) is ON, and if it is ON and AF is selected, the operation proceeds to S-U3 with YES, and NO (manual).
If so, move to S-U4. The S-U3 judges whether the pulse interval output from the AF pulser is 100 msec or more,
If it is less than msec, the process moves to S-U5 with NO, and if it is 100 msec or more, moves to S-U4 with YES.

When S-U3 is switched to S-U5, the pulse count value AFP of the number of pulses output from the AF pulser is counted and S
-Transfer to U6, and in S-U6, determine whether the pulse count value AFP is larger than the maximum value AFPmax that can drive the focusing lens group to the maximum. If it is smaller, move to S-U7 with YES, and if it is larger, Move to S-U4 with NO. Then, in S-U4, the focusing lens group is stopped by performing the AF STOP processing shown in FIG. 40, and the flow shifts to S-U7. This is because if the pulse output from the AF pulsar 48 during the focusing lens group drive continues to be output even if the pulse exceeds the maximum value AFPmax, the battery will be consumed so much that it is stopped in this case.

Then, in the S-U7, the zooming lens group driving flag PZGO
Determines whether or not PZGO = 1 (during driving), and if not driving, shifts to S-U13 with NO, and if driving, returns YES to S-U8. In this S-U8, it is judged whether or not the zoom switch SWPZ is ON, and if it is ON, the result is YES, the process proceeds to S-U9, and NO.
If so, move to S-U10. The S-U9 judges whether the pulse interval output from the PZ pulsar 49 is 100 msec or more.If it is less than 100 msec, NO is selected and the process moves to the S-U11 for 100 msec.
If it is above, shift to S-U10.

When S-U9 shifts to S-U11, it counts the pulse count value PZP of the number of pulses output from the PZ pulser and shifts to S-U12. In S-U12, the pulse count value PZP changes to the zooming lens group. Is determined to be larger than the maximum value PZPmax that can be maximally driven, and if it is smaller, the process proceeds to S-U13 with YES,
If it is larger, move to S-U10 with NO. And in S-U10
By performing the ZOOM STOP process in Fig. 41, the zooming lens group is stopped and the process moves to S-U13. This is the PZ Pulsar 4
This is because if the pulse output from 9 during driving the zooming lens group continues to be output even if it exceeds the maximum value PZPmax, the battery will be greatly consumed, and in this case it will be stopped.

With the S-U13, the focusing lens group driving flag AFGO
Determines if AFGO = 1, and if it is not driving, NO in S-U1
Move to 4. In this S-U14, it is determined whether the zooming lens group driving flag PZGO is PZGO = 1 or not, and if it is not driving, the process proceeds to S-U18 with NO. Then, with this S-U18, the power hold is released and the process ends.

If the focusing lens group is being driven and is YES in S-U13, or if the zooming lens group is driving and is YES in S-U14, the process proceeds to S-U15.
Then, in S-U15, it is determined whether or not the storage time has ended, and if not, the process proceeds to S-U19 with NO. And in S-U19, the main switch or lock switch SWLOC
It is judged whether K is ON or not, and if it is OFF, it is NO with S-.
It returns to U1 and loops. If it is ON, YES is selected and the process moves to K in FIG.

On the other hand, when the S-U15 shifts to the S-U16, the S-U16 stops the focusing lens group by performing the AF STOP processing of FIG. 40 and shifts to the S-U17. ZOOM ST
The OP processing stops the zooming lens group and shifts to S-U18, where the power hold is released and the process ends.

In the embodiment described above, an example has been shown in which the zoom position is detected by the zoom code plate, but the invention is not necessarily limited to this. For example, as shown in FIG. 42, a reflection plate for circumferentially extending the position detection is provided on the outer periphery of the base of the cam barrel 29.
A structure in which the reflection type photodetector 65 is arranged so as to be fixed to the reflection plate 64 so as to face the reflection plate 64 may be adopted. The photodetector 65 has a light emitting element that emits light toward the reflecting plate 64 and a light receiving element that receives the light reflected by the reflecting plate. Moreover, as the reflection plate 64, for example, a density change type in which the density changes from one end to the other end as shown in FIG. 43 (A) may be used, or in FIG. A bar code plate as shown in B) may be used.

As shown in FIGS. 44 and 45, an electrode plate 66 fixed to the base of the cam barrel 29 in the circumferential direction, and an electrode plate 67 attached to the fixed frame 27 side facing the electrode plate 66. It is also possible to provide a condenser position variable type zoom position detecting means composed of and to detect the zoom position from the change in the electrostatic capacitance.

Further, as shown in FIG. 46, a variable resistance type zoom position detecting means including a resistance plate 68 fixed to the base of the cam barrel 29 in the circumferential direction and a brush 69 elastically contacted with the resistance plate 68. May be provided to detect the zoom position from the change in resistance of the variable resistor.

Further, FIG. 47 conceptually shows the relationship between the power zoom mechanism and the pulsar used in the present invention. Here, it is assumed that this pulsar also serves as a zoom code plate and a PZ pulsar, but a zoom code plate may be provided in addition to this pulsar, and a pulsar and a PZ pulsar that replace the zoom code plate are used in combination. You can also

In FIG. 47, a gear 70 is provided at the base of the cam barrel 29, and the PZ motor M2 is linked with the gear 70 via a reduction gear mechanism 71. The reduction gear mechanism 71 includes a gear 72 that meshes with the gear 70, a pinion 73 that meshes with the gear 72, and a pinion 73.
Has an idle shaft 74 fixed thereto and a gear 75 fixed to the idle shaft 74. In addition, a transmission type PZ pulsar 49 is provided between the idle shaft 74 and the lens barrel side (not shown).
Is installed. This PZ Pulsar 49 has an idle shaft 74
It has a slit plate 76 fixed to it and a photodetector 77 arranged at the peripheral edge of this slit plate 76. As shown in FIG. 47, a large number of slits 76a extending in the radial direction are formed in the peripheral portion of the slit plate 76 at equal pitches in the circumferential direction. The photodetector 77 is a light emitting element 77a.
The light receiving element 77b and the light receiving element 77b are arranged at positions sandwiching the peripheral edge of the slit plate 76. In addition, such a PZ motor M2 and reduction gear mechanism
The arrangement of 71 is not limited to the illustrated position,
They are appropriately arranged in consideration of other parts and the like.

Further, as the PZ pulsar 49, a reflective type may be used other than the transmissive type. 49 and 50 show an example of a reflection type pulsar. In this example, a reflection plate 78 is fixed to the idle shaft 74, and reflection surfaces 78a extending in the radial direction are provided on the reflection plate 78 at equal pitches in the circumferential direction, and the reflection plate 78 has the same reflection type as the photodetector 52. The photodetector 79 faces each other.

Further, FIGS. 51 and 52 show another example of the reflection type pulsar. In this example, a multifaceted reflector 80 having a reflecting surface on the idle shaft 74 is fixed, and a reflective photodetector 81 similar to the photodetector 52 is opposed to the circumferential surface of the multifaceted reflector 80. Is.

(Effects of the Invention) As described above, according to the present invention, even when the continuous shooting mode is set, it is possible to control the image magnification and shoot at the set magnification. Therefore, unlike continuous shooting with a normal camera, even when the subject is moving between the previous releases, the focal length is changed to keep the magnification to the subject constant and the next release is performed. It is possible to obtain a photograph whose magnification is controlled.

[Brief description of drawings]

FIG. 1 is a control block circuit diagram of an image magnification control device for a camera according to the present invention. FIG. 2 is a circuit diagram showing in more detail the portion on the camera body side in the image magnification control device of the camera shown in FIG. FIG. 3 is a circuit diagram showing in more detail the part on the side of the taking lens in the image magnification control device of the camera shown in FIG. FIG. 4 is a schematic explanatory view showing an example of a movable mechanism section of the zooming lens group of the taking lens shown in FIG. FIG. 5 is an explanatory diagram of the zoom code plate of FIG. FIG. 6 is a schematic explanatory view showing the relationship between the subject and the image by the taking lens. FIG. 7 is a schematic explanatory view for explaining the principle of constant image magnification according to the present invention. FIG. 8A is a three-dimensional change coordinate diagram showing a change in the focal position of the focusing lens group by zooming. FIG. 8B is an explanatory diagram for explaining the meaning of the coordinates in FIG. FIG. 9A is a three-dimensional change coordinate diagram showing a change in the defocus amount of the focusing lens group due to zooming. FIG. 9B is an explanatory diagram for explaining the meaning of the coordinates in FIG. 9A. FIG. 10 is an explanatory diagram showing the relationship between the zoom position of the zooming lens group and the K value. FIG. 11 is an explanatory diagram showing the relationship between the zoom position of the zooming lens group and the focal length of the focusing lens group. FIG. 12 is an explanatory diagram of a correction curve in which the relationship between the zoom position and the K value of the zooming lens group shown in FIG. 10 is corrected. FIG. 13 is an explanatory diagram of a correction curve in which the relationship between the zoom position of the zooming lens group and the focal length of the focusing lens group in FIG. 11 is corrected. 14 to 41 are flowcharts for explaining the operation of the image magnification control device for a camera according to the present invention. FIG. 42 is an explanatory diagram showing another example of the zoom position detecting means for detecting the zoom position of the zooming lens group. FIG. 43 is a development view of the reflector shown in FIG. 42. FIG. 44 is an explanatory diagram showing still another example of the zoom position detection means for detecting the zoom position of the zooming lens group. FIG. 45 is an illustration of the electrode plate of FIG. 44. FIG. 46 is an explanatory diagram showing still another example of the zoom position detection means for detecting the zoom position of the zooming lens group. FIG. 47 is an explanatory view conceptually showing one example of the power zoom mechanism of the taking lens. FIG. 48 is a front view of the slit plate of FIG. 47. FIG. 49 is a front view showing another example of the PZ pulsar shown in FIG. 47. FIG. 50 is an illustration of the reflector shown in FIG. 49. FIG. 51 is an explanatory diagram showing still another example of the PZ pulsar shown in FIG. 47. FIG. 52 is a front view of the multifaceted reflector shown in FIG. 51. 1 ... Camera body 3 ... Shooting lens 4 ... Camera control circuit 5 ... Lens control circuit 48 ... AF pulsar (focus position sensor) 49 ... PZ pulsar (zoom position sensor) M ₁ ... AF motor M ₂ ... PZ motor

Continuation of the front page (56) Reference JP-A-53-113527 (JP, A) JP-A-63-131112 (JP, A) JP-A-57-165806 (JP, A) JP-A-62-116914 (JP , A) JP-A-1-307711 (JP, A)

Claims (1)

[Claims] 1. A photographing lens having a zooming lens driven by a zoom driving means and a focusing lens driven by a focus driving means, a focal length detecting means for detecting a focal length of the photographing lens, and the photographing lens. Focus detection means for detecting the defocus amount dx of the photographing lens with respect to the subject using the incident light flux, means for calculating the distance x0 between the rear focus and the focus position based on the amount of extension of the focusing lens, and the focus When defocus is detected from the detection means,
The focus driving means is controlled so that the photographing lens is in focus, and the zoom driving means is controlled so as to maintain the set image magnification from the image magnification set by the image magnification setting means and the x0 and dx. Drive control means for starting the drive of the zoom lens by the zoom drive means before the drive of the focus lens by the focus drive means is completed at the latest, and continuous release while the release switch is turned on. And a mode selection unit for selecting one of a single shooting mode in which a release operation is performed only once when the release switch is turned on. The drive control unit is continuously operated by the mode selection unit. When the shooting mode is selected, the image magnification is controlled to be kept constant for each release. Image magnification control device for a camera, wherein the door.