JP2973437B2 - Camera with varifocal lens - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a camera provided with a varifocal lens as a photographing lens.

[Prior Art] Conventionally, a varifocal lens which has a first lens driven at the time of zooming and a second lens driven at the time of focus adjustment, and is out of focus by driving the first lens is known. I have. In general, a varifocal lens has advantages such as being smaller and lighter at the same zoom ratio as compared with a normal zoom lens, and being able to shorten a minimum photographing distance. However, this lens has a drawback that when the focal length is changed, the focus shifts, and the usability is not good. Therefore, it has been conventionally proposed to automatically correct defocus caused by zooming of a varifocal lens in a camera with a built-in lens. Further, it has been proposed that a predetermined amount of zoom and correction of defocus caused by the zoom are alternately performed during zoom driving. However, it has not been proposed to perform a predetermined amount of zoom even when the zoom operation is stopped. Rather, the prior art employs a method in which the zoom lens is immediately stopped when the zoom operation is stopped, and then the focus adjustment lens is driven to the in-focus position (Japanese Patent Laid-Open No. 63-289516). Reference).

[Problems to be Solved by the Invention] In a camera equipped with a varifocal lens, a focal length after a predetermined amount of zoom driving is detected in order to automatically correct a focal shift caused by zooming, and a focal point with respect to the focal length at that time is detected. If the shift amount is calculated and corrected, if the zoom drive is continued even when the focus shift amount is corrected, the focus adjustment operation will be delayed more than the zoom drive, and the focus will not be adjusted during the zoom drive. There is a problem that the shift state continues (follow-up correction). In addition, since it is not known when the zoom operation according to the photographer's will is stopped, the zoom drive and the focus adjustment operation are not necessarily linked. Therefore, if the zoom drive is immediately stopped when the zoom operation is stopped, there is a problem that the focus adjustment operation does not interlock with the stop of the zoom drive and a state where the focus is shifted occurs.

The present invention has been made in view of such a point,
The purpose is to prevent a delay in the focus adjustment operation with respect to zoom driving when performing automatic correction of defocus due to zooming in a camera having a varifocal lens as a photographing lens, and it is unlikely that a defocused state occurs. Is to do.

In the present invention [Means for Solving the Problems] In order to solve the above problem, as shown in FIG. 1, it has a lens L _Z and the focusing lens L _F zoom, the zoom a camera with a use lens L _Z varifocal lens out of focus by driving the photographing lens, a zoom operation unit 1 to be operated from the outside,
Zoom driving means 2 for driving the lens L _Z zoom in response to the operation of the zoom operation unit 1, the focusing means 3 for driving the lens L _F for focusing, the focal length detection means for detecting the focal length of the taking lens 4 and a zoom amount for calculating a target focal length as a target of zoom driving by adding or subtracting a predetermined amount to or from a current focal length detected by the focal length detecting unit 4 when the zoom operating unit 1 is operated. Calculation means 5
And the target focal length calculated by the zoom amount calculating means 5 is periodically inputted to calculate the amount of defocus that occurs when the target focal length is reached, and focus so as to eliminate the calculated defocus amount. a first control means 6 for controlling the adjusting means, controls the zoom drive unit 2 to drive the lens L _Z zoom until the target focal distance calculated by the zoom amount calculation unit 5 during operation releasing the zoom operation unit 1 Second
And the control means 7 described above.

However, FIG. 1 is an explanatory diagram showing the configuration of the present invention in a functional block, and in the following embodiments, all or a part of the units 1 to 7 are realized by software of a microcomputer. I have. The zoom amount calculating means 5 which is a main part of the present invention corresponds to # L517 and # L527 in FIG. 39 in the embodiment described below.

[Operation] Hereinafter, the operation of the present invention will be described with reference to FIG. Taking lens includes a lens L _Z and the focusing lens L _F zoom lens L _Z zoom changes the focal length of the drive has been taking lens during zoom, lens L _F for focusing at the time of focus adjustment Driven to change the shooting distance of the shooting lens. The zoom operation means 1 is externally operated by the photographer to instruct zooming in the tele direction or the wide direction.
Zoom driving means 2 drives the lens L _Z zoom in response to the operation of the zoom operation unit 1. Moreover, focusing means 3 drives the lens L _F for focus adjustment. In this system, the focal shifts by the driving of the zoom lens L _Z, by driving the focusing lens L _F every time the zoom, it is necessary to correct the deviation of the focal point. Therefore, in the present invention, by driving the lens L _Z zoom by a zoom driving unit 2 drives the lens L _F for focusing by the focus adjusting unit 3 each time of changing the focal length by a predetermined amount, The focus shift due to the zoom drive is corrected. For this, the focal length of the taking lens from the position of the zoom lens L _Z detected by the focal length detection unit 4, the addition or subtraction to zoom drive a predetermined amount of predetermined on the detected current focal length Is calculated by the zoom amount calculating means 5. Then, the first control means 6 predictively calculates the amount of defocus generated when the target focal length is reached by periodically inputting the target focal length, and adjusts the focus so as to eliminate the calculated defocus amount. Control means 3. As a result, the focus adjustment unit 3 can predict the amount of defocus generated as a result of the zoom driving, so as to perform the focus adjustment in parallel with the zoom driving so as to eliminate the defocus amount. Defocus is reduced. Therefore, in a camera such as a single-lens reflex camera or a camera with an electronic viewfinder that can observe the focus state of the shooting screen, it is possible to suppress the focus state of the shooting screen from being blurred during zoom driving. The zoom driving unit 2 as at the time the operation releasing a zoom operation unit 1 drives the lens L _Z zoom until the target focal distance calculated by the zoom amount calculation unit 5
Is controlled by the second control means 7. That is, in the present invention, the zoom lens _LZ is driven to the target focal length instead of immediately stopping the zoom drive even when the operation of the zoom operation means 1 is released. Therefore, the first control means 6 controls the zoom amount calculation means 5 regardless of the cancellation of the zoom operation by the zoom operation means 1.
By calculating the amount of defocus that occurs when the target focal length is input from the camera and controlling the focus adjustment unit 3 based on the calculation result, the defocus caused by the zoom drive can be corrected.

In the case of a lens-interchangeable camera, when the focus adjustment means 3 and the first control means 6 are provided on the camera body, the camera body cannot immediately detect that the zoom operation has been stopped on the lens side. Therefore, as in the present invention, the lens is driven to zoom to the target focal length, and the camera body side performs a focus adjustment operation so that focusing is performed at the target focal length. Can be prevented.

The more detailed structure and operation of the present invention will become more apparent in the following description of the embodiments.

Example Hereinafter, a single-lens reflex camera system including a varifocal lens will be described as an example of the present invention.
FIG. 2A shows an external configuration of the camera body BD to which the present invention is applied, and FIG. 2B shows the camera body BD.
1 shows an external configuration of an interchangeable lens LE which is interchangeably mounted on a lens. Hereinafter, the names and functions of the respective units will be briefly described.

Reference numeral 11 denotes a slider for turning on the main switch. When the slider 11 is in the ON position, the camera body
The BD is operable, and when in the OFF position, the camera body BD is inoperable.

Reference numeral 12 denotes a release button. When the first step is depressed, a shooting preparation switch S1 described later is turned on, and photometry, exposure calculation, AF
Each operation starts. In addition, the release switch S2, which will be described later, is turned on by pressing the second stage, and the exposure control operation starts.

Reference numeral 13 denotes an IC card insertion portion. By inserting an IC card containing a microcomputer into the insertion portion 13, the function of the camera body BD can be added.

Reference numeral 14 denotes a body display section, which includes a shutter speed, an aperture value,
Displays IC card information, battery warning mark, etc. Also,
A display section (not shown) in the viewfinder displays a shutter speed, an aperture value, a zoom mode, and the like.

Reference numeral 15 denotes a mount lock pin. Interchangeable lens LE is mounted, if the mount lock state, lens mounting switch S _LE is turned OFF later, lens mounting switch S _LE when the other is ON.

Reference numeral 16 denotes an AF coupler, which is rotationally driven based on the rotation of an AF motor in the camera body BD.

Reference numeral 17 denotes a stop lever, which is used to stop down the stop of the interchangeable lens LE by the number of stop steps determined by the camera body BD.

Reference numeral 18 denotes a card key, which is used to turn on / off an IC card function.

Next, the names and functions of the components of the interchangeable lens LE will be described.

A mode key 22 is used to select various zoom modes described later. When the mode key 22 is pressed, a mode switch _SMD described later is turned on.

Reference numeral 23 denotes a lens key, which is used for performing a storage operation or an automatic return operation (to be described later in detail) in a certain zoom mode. When the lens key 23 is pressed, the lens switch S _Q will be described later, is ON.

Reference numeral 24 denotes a memory key, which is used to permit the above-mentioned storage operation. When the memory key 24 is slid, the memory switch S _R described later is ON.

25 is a mount lock groove, 26 is an AF coupler, and 27 is a focusing lever. When the interchangeable lens LE is mounted on the camera body BD, the mount lock pin 15 of the camera body engages with the mount lock groove 25, and the convex portion of the AF coupler 16 on the body engages with the concave portion of the AF coupler 26 on the lens side. , On the body side
The rotation of the AF motor is transmitted to the lens side through the AF couplers 16 and 26, and the focus adjustment lens group moves to adjust the shooting distance. Further terminals J ₁ through J ₈ on the lens side is connected to the terminal J ₁₁ through J ₁₈ of the body side. Also, the refinement lever 17
Engages the aperture lever 27 on the lens side, and moves the aperture lever 17 on the body by the amount of movement of the aperture lever 17 on the lens side.
27 moves following, and the aperture opening is
Is controlled to a value corresponding to the movement amount of.

Reference numeral 28 denotes a lens display unit that displays a focal length f, a shooting distance D, and the like.

Reference numeral 80 denotes an operation ring which is rotated to specify the direction and speed of the power zoom.

Next, a circuit configuration of the camera system will be described.

FIG. 3 is a circuit diagram of an internal circuit built in the camera body BD.

μC1 is an in-body microcomputer (hereinafter, referred to as “in-body microcomputer”) that controls the entire camera and performs various calculations.

AF _CT is a focus detection light receiving circuit, and a focus detection CCD
And a circuit for driving the CCD, and a circuit for processing the output of the CCD, performing A / D conversion, and supplying it to the microcomputer μC1 in the body.
It is connected to the microcomputer μC1 in the body via the data bus. The focus detection light receiving circuit AF _CT, information on the defocus amount of an object located in the ranging area is obtained.

LM is a photometric circuit provided in the finder optical path, and A / D converts the photometric value and supplies the result to the microcomputer μC1 in the body as luminance information.

DX is a film sensitivity reading circuit which reads the film sensitivity data provided in the film container and serially outputs the data to the microcomputer μC1 in the body.

DISPC inputs display data and display control signals from the microcomputer μC1 in the body, and displays the display section DISP _{I on the} top of the camera body.
(Display unit 14 in FIG. 2) and display unit DISP in the viewfinder
A display control circuit that causes the _II to perform a predetermined display.

This is an IC card to be inserted into the CD card insertion unit 13, and includes the microcomputer μC3 in the card. IC card CD in this embodiment
Has a function of performing an inter-exposure zoom for driving a zoom lens during exposure. This IC card CD will be described later in detail.

LE _CT is a lens in the circuit built in the interchangeable lens LE, supplies interchangeable lens specific information body microcomputer .mu.C1. This lens circuit LE _CT will also be described later in detail.

M1 is an AF motor that drives a lens group for focus adjustment in the interchangeable lens via AF couplers 16 and 26.

MD1 is a motor drive circuit that drives the AF motor M1 based on the focus detection information, and normal rotation, reverse rotation, and stop are controlled by a command from the microcomputer μC1 in the body.

ENC is an encoder for monitoring the rotation of the AF motor M1, and outputs a pulse to the counter input terminal CNT of the microcomputer μC1 in the body at every predetermined rotation angle. The microcomputer μC1 in the body counts these pulses, detects the amount of extension from the infinity position to the current lens position, and detects the shooting distance of the subject from the amount of extension (number of extension pulses CT).

TV _CT is a shutter control circuit that controls the shutter based on a control signal from the microcomputer μC1 in the body.

AV _CT is an aperture control circuit for controlling the iris based on the control signal from the body microcomputer .mu.C1.

M2 is a motor for winding and rewinding the film and charging the exposure control mechanism. MD2 is motor M
2 is a motor drive circuit for driving the microcomputer 2 based on a command from the microcomputer μC1 in the body.

 Next, the configuration related to the power supply will be described.

 E1 is a battery serving as a power supply for the camera body BD.

Tr ₁ is a first power supply transistor that supplies power to a part of the circuit described above. Tr ₂ is a second power supply transistor for supplying power for driving the zoom motor in the lens, and has a MOS configuration.

DD is a DC / DC converter for stabilizing the voltage V _DD supplied to the microcomputer μC1 in the body, and a power control signal PWO
Operates when the signal is at the “High” level. V _DD is the microcomputer μC1 in the body and the circuit LE _{CT in} the lens, the microcomputer μC3 in the card,
This is the operating power supply voltage of the film sensitivity reading circuit DX and the display control circuit DISPC. V _CC1 focus detection circuit AF _CT, an operation power supply voltage of the light measuring circuit LM, is supplied through the feed transistor Tr ₁ from the power source battery E1 under control of the power supply control signal PW1. V _CC2 is the operating power supply voltage of the zoom motor in the lens, is supplied via the power supply transistor Tr ₂ from the power source battery E1 under control of the power supply control signal PW2. V _CC0 is the motor drive circuit MD1, shutter control circuit TV _CT , aperture control circuit A
V _{CT is} an operation power supply voltage of the motor drive circuit MD2, and is directly supplied from the power supply battery E1.

D ₁ to D ₃ are DC / when DC converter DD has stopped operating, the microcomputer in the body a voltage lower than the voltage V _DD .mu.C1
And a diode group for reducing power consumption. This low voltage is set to the lowest voltage at which the microcomputer μC1 in the body can operate. When the DC / DC converter DD stops operating, only the microcomputer μC1 in the body can operate.

BC1 is a battery check circuit that detects the voltage V _CC0 of the battery E1 and informs the microcomputer μC1 of the detection result.

GND1 is a ground line of low-power unit, between the lens and the body are connected through the terminal J _17, J _7. In the body, the analog section and the digital section need to be on separate ground lines, but are shown as a single line in the drawing.

GND2 is ground line of the large power unit, between the lens and the body are connected through the terminal J _18, J _8.

 Next, switches will be described.

The S _CD is a normally-open push switch for switching the function of the IC card CD between valid / invalid when the IC card CD is mounted, and is turned ON when the above-mentioned card key 18 is pressed. Is done.

S1 is a shooting preparation switch which is turned on when the release button 12 is depressed at the first stage. When the switch S1 is turned on, an interrupt signal is input to an interrupt terminal INT1 of the microcomputer μC1 in the body, and a preparatory operation necessary for influences such as photometry and AF operation is performed.

S _M slide 11 for enabling operation of the camera is ON
This is a main switch that is turned on when in the position and turned off when in the off position.

PG1 is a pulse generator for outputting a "Low" level of the pulse for each switch S _M is varying from OFF to ON to or OFF from ON. The output of the pulse generator PG1 is input as an interrupt signal to an interrupt terminal INT2 of the microcomputer μC1 in the body.

S2 is a release switch that is turned on when the release button 12 is pressed down in the second stage. When the switch S2 is turned on, a shooting operation is performed.

S3 is a mirror up switch that is turned on when the mirror up is completed, and is turned off when the shutter mechanism is charged and the mirror is down.

S _RE1 turns off when battery E1 is attached to camera body BD.
This is a battery attachment detection switch that is F. When the battery E1 is mounted and the battery mounting detection switch S _RE1 is turned off, the resistance R
1, the capacitor C1 is charged, and the reset terminal RE1 of the microcomputer μC1 in the body changes from “Low” level to “High” level. Then, the microcomputer μC1 in the body executes a reset routine described later.

S _RE3 is a card attachment detection switch that is turned off when an IC card CD is attached. IC card CD is mounted,
When the switch S _RE3 is turned off, the reset terminal RE3 of the microcomputer μC3 in the card is changed from the “Low” level to the “High” level as before.
Level, and the microcomputer μC3 in the card is reset.

Next, a configuration for serial data communication will be described.

Photometry circuit LM, film sensitivity reading circuit DX, display control circuit
DISPC and microcomputer μC3 in the card are serial input SIN,
Data communication is performed serially with the microcomputer μC1 in the body via each signal line of the serial output SOUT and serial clock SCK. The communication target with the microcomputer μC1 in the body is selected by the chip select terminals CSLM, CSDX, CSDISP, and CSCD. That is, when the terminal CSLM is at the “Low” level, the photometric circuit LM is selected, when the terminal CSDX is at the “Low” level, the film sensitivity reading circuit DX is selected, and when the terminal CSDISP is at the “Low” level, the display control is performed. Circuit DISP
When C is selected and the terminal CSCD is at the “Low” level, the microcomputer μC3 in the card is selected. Further, three serial communication signal lines SIN, SOUT, and SCK are connected to terminals J ₁₅ and J ₅ ;
_{J 14, J 4; J 16} , is connected to the lens circuit LE _CT via J _6, when selecting a lens in the circuit LE _CT as communication target is for the terminal CSLE "Low" level this signal is transmitted to the lens circuit LE _CT via the terminal J _3, J _13.

Next, FIG. 4 is a circuit diagram of the lens in the circuit LE _CT incorporated in the interchangeable lens LE. In the drawing, μC2 denotes a microcomputer in the lens for controlling a zoom motor built in the interchangeable lens LE, data communication with the camera body BD, and control of mode setting.

Here, to describe the group of terminals J ₁ through J ₈ connected to the camera body BD, J ₁ is the power supply voltage for driving the zoom mode
A power supply terminal for supplying V _CC2 from the body side to the lens side, J ₂ is a power supply terminal for supplying a power supply voltage V _DD other than the above for driving the zoom motor from the body side to the lens side, and J ₃ is a data communication request terminals for input and output of signals indicating, J ₄ denotes a clock terminal for inputting a clock for data communication from the body side, the serial input terminal J ₅ is for inputting data from the body side, J ₆ is the data to the body side output for serial output terminal, J ₇ is a ground terminal of the circuit other than the circuit for the drive motor,
J ₈ is a ground terminal of the circuit for driving the motor.

The signal line for the terminal CSLE transmitted via the terminals J ₃ and J ₁₃ between the interchangeable lens and the body is a bidirectional signal line. When a signal is transmitted from the microcomputer μC1 in the body to the microcomputer μC2 in the lens via this line,
An interrupt occurs in the microcomputer μC2 in the lens, the microcomputer μC2 in the lens is activated, and the interchangeable lens is designated as a communication target with the body. On the other hand, when a signal is transmitted from the microcomputer μC2 in the lens to the microcomputer μC1 in the body via this line, an interrupt signal is input to the lens interrupt terminal LEINT of the microcomputer μC1 in the body by the pulse generator PG2,
The microcomputer μC1 in the body is activated. When data is transmitted from the microcomputer μC1 in the body to the microcomputer μC2 in the lens, the microcomputer μC1 in the body does not accept the interrupt LEINT.

The RSIC is a reset IC for resetting the microcomputer μC2 in the lens when the voltage _VDD supplied from the body becomes lower than the normal operating voltage of the microcomputer μC2 in the lens. R2 and C2 are a reset resistor and a capacitor for resetting the microcomputer μC2 in the lens.

RE2 is a reset terminal of the microcomputer μC2 in the lens,
The voltage V _DD for driving the circuit inside the lens is supplied from the body, and the terminal RE2 is set to “Lo” by the resistor R2 and the capacitor C2.
When the level changes from the “w” level to the “High” level, the microcomputer μC2 in the lens performs a reset operation.

ZVEN is a zoom speed encoder linked to the operation ring 80 described above, and sets the speed and direction of the power zoom at the time of power zoom.

ZMEN is a coarse zoom encoder for indicating an absolute position of a zoom ring to be described later. The lens of the present embodiment is a lens having a focal length of 28 to 200 mm, and the zoom encoder ZMEN
Is composed of a code plate representing 12 focal length ranges by 4-bit data and a brush slidably contacting the code plate. 28 to 34 mm is detected as one focal length range, and 34 mm or more is detected as one focal length range every 15 mm increase.

M3 is a zoom motor for driving a zoom ring described later.

MD3 is a motor drive circuit for driving the zoom motor M3, and controls the rotation of the zoom motor M3 according to a control signal indicating the motor drive direction and drive speed given from the microcomputer μC2 in the lens. The microcomputer μC2 in the lens
In response to the motor stop signal or the motor stop signal given from the controller, short-circuiting of both ends of the zoom motor M3 and stop of voltage application are performed.

ENC3 is an encoder for detecting the rotation amount of the zoom motor M3, and detects the coarse focal length range detected by the zoom encoder ZMEN more finely. The reason why the zoom encoder ZMEN and the encoder ENC3 are used together will be described later.

DSP is an in-lens display control circuit that performs display on the lens display unit 28 based on data from the in-lens microcomputer μC2. The display contents will be described later in the description of FIG. 58.

 Next, switches will be described.

S _LE is a lens attachment detection switch.
Is turned off when mounted on the camera body BD and the mount is locked. In other words, the interchangeable lens LE is the camera body B
When removed from D, switch S _LE is turned ON and capacitor C2 is short-circuited. As a result, the charge stored in the capacitor C2 is discharged, and the terminal RE2 of the microcomputer μC2 is discharged.
Goes to the “Low” level. Thereafter, when the interchangeable lens LE is mounted on the camera body BD, the switch S _LE is turned off, the capacitor C2 is charged by the power supply line V _DD , and after a predetermined time determined by the resistance R2 and the capacitance of the capacitor C2, the terminal RE2 Changes to the “High” level, and the microcomputer μC
2 performs a reset operation.

_SMD is a mode switch that is turned on when the mode key 23 is pressed. Each time this switch is turned ON, the first auto-zoom program mode (AZP1 mode), the two-point auto-zoom program mode (AZP2 mode), the reset mode (RST mode), and the manual zoom mode (MZ
Mode) are selected in the same order. Here, AZP1 mode is
In this mode, the shooting magnification is automatically determined according to the subject distance. The AZP2 mode is a mode in which zooming is performed by directly connecting a photographing magnification corresponding to a distance between two points selected by a photographer to a distance between the two points. The reset mode is a mode for automatically returning to the shooting distance and the focal length stored at a certain point in time. The manual zoom mode is a mode in which no operation other than the power zoom is performed. In the reset mode, simply setting the shooting distance and the focal length, the automatic return operation to the set shooting distance and the focal length is performed when the lens switch _SQ is operated in the manual zoom mode. Done.

S _Q denotes a lens switch, storage of two points when the AZP2 mode, storing a point when the reset mode, and is a normally open push switch operated during automatic recovery after storage.

S _R is a memory switch the memory key 24 is turned ON when being slid, when performing storage in AZP1 mode or AZP2 mode described above, or a switch is operated to release the memory.

FIG. 59 shows a cross-sectional structure of the interchangeable lens LE and a schematic configuration of a camera body BD to which the lens is attached. The interchangeable lens LE is a varifocal lens including first to fourth lens groups LE to L4. FIG. 60 is a diagram for explaining the drive amounts of the first to fourth lens units L1 to L4 in the present varifocal lens. In the figure, curves Z1 to Z4 indicate the movement trajectories of the first to fourth lens units L1 to L4 during zooming, respectively. The horizontal direction indicates the direction of the optical axis of the lens, and the vertical direction indicates the change in the focal length due to zooming.
The upper diagram shows the arrangement of the first to fourth lens units L1 to L4 at the wide-angle end focal length (shortest focal length), and the lower diagram shows the arrangement at the telephoto end focal length (longest focal length). The arrangement of the first to fourth lens units L1 to L4 is shown. At an arbitrary zoom position between each of the focal lengths at the wide end and the tele end, the first to fourth lens units L1 to L4 are arranged at intersections between the curves Z1 to Z4 and an arbitrary horizontal line. The first to fourth lens groups L1 to L4 are driven in conjunction with each other. As described above, zooming (magnification) is performed by the first to fourth lens units L1 to L4 independently moving between the short focal length end and the long focal length end. Further, the third and fourth lens units L
Focusing (focus adjustment) is performed by moving back and forth in the optical axis direction as a unit with L3.

The present optical system is a vari-focal system that is out of focus when zooming is performed, and performs focus compensation by moving the lens units L3 and L4 for focusing each time the magnification is changed. Generally, the varifocal system can be smaller and lighter with the same zoom ratio compared to a normal zoom lens that does not lose focus even if zooming is performed.
There are advantages such as the shortest shooting distance can be shortened. Therefore, if the configuration is made such that the focus compensation for each zooming as described above can be automatically performed, the usability is the same as that of a conventional zoom lens, and a lens superior in specifications can be provided.

 Hereinafter, the configuration and operation of the interchangeable lens LE will be described.

In FIG. 59, W1 to W4 are moving frames for holding the first to fourth lens units L1 to L4, respectively. The pins P1 to P4 erected on the respective moving frames W1 to W4 are connected to the fixed cam ring 30 and the moving cam ring 40.
The movement is regulated at the intersection of the cams for the moving frames cut in the above manner. The exploded view of the cam rings 30, 40
Shown in the figure. In the figure, reference numerals 31 to 33 indicated by solid lines denote cams on the fixed cam ring 30, and 31 for the first group, 32 for the second group, and third and fourth cams.
The group uses a common straight groove, which is 33. Reference numerals 41 to 44 indicated by broken lines indicate cams on the movable cam ring 40,
The numbers for the fourth group are 41 to 44 in order. The illustrated state is the wide end state, and when the movable cam ring 40 is rotated, the cam group indicated by the broken line moves in the direction of arrow Tele, and the first and second lens groups L1 and L2 rotate. The third and fourth lens units L3 and L4 are separately extended according to the cam shape without rotation, and reach the telephoto end. On the other hand, at the time of focusing, the movable cam ring 40 is driven in the optical axis direction (the direction of the arrow Focus), and the first and second lens units L1 and L2 do not move because the cam 4142 is in the rectilinear groove.
The lens units L3 and L4 both move back and forth in the cams 43 and 44.

In FIG. 59, reference numeral 80 denotes a rotary operation ring for power zoom.When the photographer rotates the operation ring 80 around the optical axis, power zoom is started, and focusing or focusing is performed according to the amount of rotation. When the zooming speed is variable and the photographer releases his hand, the operating ring 80 is
Automatically returns to the original position, and the power zoom ends. The direction of the power zoom is determined according to the rotation direction of the operation ring 80.

Next, the focusing mechanism will be described. Numeral 35 is a straightening ring for focusing, and a helicoid screw is provided on the outer peripheral surface thereof. The helicoid screw meshes with a helicoid screw provided on the inner peripheral surface of the focus ring. A rectilinear transmission pin P5 is bored from the inner surface of the rectilinear ring 35, and the rectilinear transmission pin P5 is movably rectilinear along a rectilinear guide groove 37 provided in the fixed cam ring 30. Therefore, the rectilinear ring 35 is movable in the optical axis direction, but does not rotate with respect to the fixed cam ring 30. On the other hand, although the focus ring 34 is rotatable with respect to the fixed cam ring 30, the focus ring 34 is fitted in a concave streak provided on the inner peripheral surface of the fixed cylinder 70 so that the focus ring 34 is moved in the optical axis direction. Not to move. Therefore, when the focus ring 34 is rotationally driven, the rectilinear ring 35 moves straight in the optical axis direction. That is, when the focus ring 34 is rotated in one direction, the rectilinear ring 35 moves forward, and when the focus ring 34 is rotated in the opposite direction, the rectilinear ring 35 moves backward. The focus ring 34 can be driven to rotate by power transmitted from the body BD via the AF couplers 26 and 16. The AF coupler 26 on the lens side has a pinion 38 at the front end,
An inner gear 39 that meshes with the pinion 38 is provided on the inner peripheral surface at the rear end of the focus ring 34. A concave groove is provided on the rear end face of the AF coupler 26, and the concave groove is provided on the body side.
By fitting with a ridge provided on the front end surface of the AF coupler 16, the rotational force from the body BD can be transmitted. The rotation of the AF coupler 16 on the body side is controlled by the AF motor M1. This AF motor M1 is under the control of the microcomputer μC1 in the body.

The subject light that has passed through the lens is guided by a main mirror MR1 to a finder optical system (not shown) arranged above the body BD, passes through the center of the main mirror MR1, and is reflected by a sub-mirror MR2. Te, is guided to the light receiving circuit AF _CT for focus detection arranged on the lower mirror box. FP
Is a film surface, and a focal plane shutter (not shown) is disposed immediately before the film surface. Focus detection light receiving circuit AF _CT is arranged in the vicinity of the film surface FP equivalent appointment plane to detect the focus state of the photographing lens based on subject light, the body a signal indicating the defocus amount and defocus direction To the microcomputer μC1. The microcomputer μC1 in the body controls the rotation of the AF motor M1 based on this signal.

Next, the mechanism of the power zoom will be described. The rotation of the movable cam ring 40, that is, zooming, is performed by rotating the operation ring 80, and the operation signal is transmitted to the microcomputer μ in the lens.
It is transmitted to C2 and is performed by rotating the zoom motor M3. The rotation of the zoom motor M3 is transmitted to the zoom ring 46 via the gear 45. A rotation transmission pin P6 protrudes from the inner surface of the rear end of the zoom ring 46. The rotation transmitting pin P6 is movable in the circumferential direction along a circumferential guide groove 36 provided along the circumferential direction of the fixed cam ring 30. Therefore, the zoom ring 46 is rotatable but does not move in the optical axis direction. On the other hand, the tip of the rotation transmitting pin P6 is fitted in a straight guide groove 47 provided in the movable cam ring 40. When you rotate the zoom ring 46,
The rotational force is transmitted to the moving cam ring 40 via the rotation transmitting pin P6 and the linear guide groove 47, and the movable cam ring 40 rotates, but the rotation transmitting pin P6 is movable in the longitudinal direction of the linear guide groove 47. The moving cam ring 40 is not restricted from moving straight by the rotation transmitting pin P6. A circumferential guide groove 48 is provided on the outer peripheral surface of the rear end portion of the movable cam ring 40.
The straight transmission pin P5 of the focus ring 35 described above is fitted to the. Therefore, the moving cam ring 40 is
The straight transmission pin P5 is generated by the straight movement of the straight ring 35 with the rotation of
And the linear movement through the circumferential guide groove 48, and the rotation of the zoom ring 46 causes the rotation around the optical axis through the rotation transmission pin P6 and the linear guide groove 47.

By the way, in the vari-focal system, when the focal length is changed by zooming, the shooting distance also changes. Therefore, in order to focus on the original shooting distance even after zooming, it is necessary to perform focus correction, and it is necessary to know the current focal length. Since the rotation angle of the movable cam ring 40 from the reference position (for example, the wide end) corresponds to the focal length, the current focal length can be known by knowing the rotation angle of the movable cam ring 40. Therefore, as described above, 2
The rotation angle of the movable cam ring 40 is known by two encoders 50 (encoder ENC3 in FIG. 4) and 60 (zoom encoder ZMEN in FIG. 4). Information from the encoders 50 and 60 is sent to the microcomputer μC2 in the lens, and a correction value corresponding to the focal length is transmitted to the microcomputer μC1 in the body via the group of electric contacts J. The microcomputer μC1 in the body rotates the AF motor M1 to move the lens groups L3 and L4 for focus adjustment, and corrects the focus instantly so that the focus is not shifted even by zooming.

FIG. 62 is an enlarged perspective view of an encoder 50 that detects the number of rotations of the zoom motor M3. The encoder 50 includes a photo interrupter 51 and an encoder plate 52. The photo-interrupter 51 has a light-emitting element and a light-receiving element arranged opposite to each other. When there is no obstacle in the optical path from the light-emitting element to the light-receiving element, an optical signal from the light-emitting element is transmitted to the light-receiving element. When an obstacle is present in the optical path, an optical signal from the light emitting element is not received by the light receiving element, and no light receiving output is generated. Encoder plate 52 is a zoom motor
The disk mounted on the rotating shaft of M3 is made up of blades provided with cuts at equal angular intervals. With respect to the rotation of the zoom motor M3, the blades and cuts are alternately positioned in the optical path of the photo interrupter 51. , The relative position with respect to the photo interrupter 51 is set. Therefore, each time the zoom motor M3 rotates by a certain angle, a pulse signal is obtained from the light receiving element of the photo-interrupter 51. By counting the number of pulse signals, it is possible to detect the rotation angle of the zoom motor M3. Can be.

FIG. 63 is an enlarged perspective view of a coarse encoder 60 that detects the rotation angle of the zoom ring 46. The encoder 60 includes a code plate 61 and a brush 62. The code plate 61 is formed of a flexible printed board fixed along the outer peripheral surface of the zoom ring 46, and five code patterns are printed along the circumferential direction of the zoom ring 46. The brush 62 is made of an elastic conductive plate fixed to the inner peripheral surface of the fixed lens barrel 70, and has five contacts in this embodiment. Each contact is slidably in contact with each of the five code patterns printed on the code plate 62. Each code pattern has a conductive portion and a non-conductive portion along the circumferential direction of the zoom ring 46. Since the logical value “1” or “0” is obtained by each contact contacting the conductive portion or the non-conductive portion, 5-bit digital data is transmitted from the code plate 61 according to the rotation angle of the zoom ring 46. can get.

Next, the reason why such two types of encoders 50 and 60 are used together will be described. Since the present lens system is a vari-focal optical system, it has already been described that the focusing state changes when the focal length changes due to zooming. In the present lens system, the change in the photographing distance is to be corrected by calculation in the lens. For this purpose, it is necessary to first inform the microcomputer μC2 in the lens of the current focal length. In order to accurately perform the correction operation, the focal length must be detected with high resolution. In the conventional zoom lens, not so high precision was required, and therefore the focal length was roughly detected by a coarse encoder 60 as shown in FIG. However, this time, the accuracy required by the present lens system cannot be achieved only by making the code pattern of the code plate 61 in the encoder 60 finer. Therefore, by mounting a photo-interrupter, which is conventionally widely used for detecting the driving amount of the AF motor M1 in the camera body, on a lens, and knowing the number of revolutions of the zoom motor M3 from the number of output pulses of the photo-interrupter, the The rotation angle of the ring 46 is strictly detected. Assuming that the focal length is already known in a one-to-one correspondence with the rotation angle of the zoom ring 46, the focal length can be accurately detected. By the way, if an encoder for detecting the focal length is formed by using only the encoder 50 shown in FIG. 62, the resolution is improved as compared with the encoder 60 shown in FIG. 63, but the following disadvantages occur. That is, although the encoder 60 reads the rotation amount of the zoom ring 46 almost directly, the encoder 50 increases the rotation angle of the zoom ring 46 to a position close to the shaft rotation angle of the zoom motor M3 via the reduction mechanism. Since the rotation amount is read, error factors such as backlash are likely to occur. In addition, since the encoder 50 reads the focal length with the total number of pulses from the telephoto end or the wide end, for example, when the number of pulses reaches 1,000 between the wide end and the telephoto end, errors due to backlash and the like accumulate, and the focal length It is difficult to know the absolute value of. Therefore, by using the encoders 50 and 60 together, the absolute position of the zoom ring 46 is detected by the encoder 60, and the section within which the code output from the encoder 60 is the same is further subdivided by the encoder 50 to read the exact focal length. , Increase the resolution. That is, each time the read value of the code board 61 changes, the counter of the number of output pulses of the photo interrupter 51 is reset to 0, and the number of output pulses of the photo interrupter 51 is counted within the section where the read value of the code board 61 is the same. I do. For each of the read values by the code plate 61, it is possible to store in advance how many millimeters of the focal length change corresponds to one pulse of the photointerrupter 51 in that section, so that an encoder with a high resolution as a whole can be obtained. Can be configured.

FIG. 64 is an exploded perspective view for explaining the configuration of the operation ring 80 of the automatic return type, and FIG. 65 is a development view of the operation ring 80 along the circumferential direction. FIGS. 66 (a) and (b) are operating rings.
It is the top view and sectional drawing for demonstrating the structure of 80 electric switch parts. In the figure, 70 is a fixed lens barrel, 80 is an operation ring, 80a,
80b is an inner diameter projection, 81a and 81b are U-shaped members, 82 is a coil spring for automatic return, 83 is a brush, and 84 is a code plate.

The U-shaped members 81a and 81b are located at the small diameter portions 70a and 70b of the fixed lens barrel 70, respectively, and are pulled together by a coil spring 82 arranged along the guide groove 70g, and the large diameter portion 70d of the fixed lens barrel 70 is It is stopped by the end face of it. The inner circumference of the operation ring 80 is fitted to the large diameter portions 70d, 70e, 70f of the fixed lens barrel 70,
The inner diameter projections 80a and 80b are loosely fitted in the U-shaped gaps in the U-shaped members 81a and 81b, respectively. As shown in FIG. 65, both of the inner diameter projections 80a and 80b substantially come into contact with the outer end face of the gap. The operation ring 80 is prevented from falling off by an annular member 85 screwed to the fixed lens barrel 70 as shown in FIG.

When holding the operating ring 80 from the state shown in FIG. 65 and rotating it in the direction shown by the arrow, it is engaged with the inner diameter projection 80a, and the U-shaped member 81a resists the tensile force of the coil spring 82,
The upper small-diameter portion 70a in the direction indicated by arrow to rotate until it abuts against the end face of the large diameter portion 70e, the rotation angle theta ₁ of the rotation is made. At this time, at the same time, the inner diameter protrusion 80b moves in the U-shaped gap of the U-shaped member 81b, but is designed so that θ ₂ > θ ₁ , so that the distance between the inner diameter protrusion 80b and the U-shaped member 81b is increased. Does not have any restrictions. Next, when the photographer releases his / her hand from the operation ring 80, the operation ring 80 is instantaneously rotated reversely by the restoring force of the coil spring 82 and returns to the original state. Holds that same applies to the direction opposite to the direction indicated by the arrow, the operation ring 80 is capable of respectively rotating angle theta ₁ of the rotation for the left and right directions, also when released, automatically returns.

In order for the operating ring 80 to function as an electric switch, a brush 83 is fixed to the inner peripheral surface of the operating ring 80 by means such as caulking as shown in FIGS. Torso 70
A code plate 84 made of a flexible printed board is arranged on the small-diameter portion 70c. Now, in the normal position shown in FIG. 65, the brush contact is in the range of “V0” shown in FIG. 66 (a), and the electric switch is in the OFF state. From this state,
When the operating ring 80 is rotated in the direction indicated by the arrow, the brush 83 moves on the code plate 84 to enter the range of "V1" and further enters the range of "V2". As a result, the code plate 8
As the output signal from 4, two types of information are input to the microcomputer μC2 in the lens. Based on this information, the microcomputer μC2 in the lens controls the zoom motor M3 at the first speed in the range “V1” and at the second speed in the range “V2”. Similarly, for the operation in the reverse direction, the rotation direction is reversed at the first speed in the range of “−V1”, and the rotation direction is reversed at the second speed in the range of “−V2”. In addition, the same information is transmitted from the microcomputer μC2 in the lens to the microcomputer μC1 in the body, and the AF motor M1 is controlled.

In the electric switch of the embodiment, two directions are used in one direction.
Although an example has been described in which the gears can be shifted in stages, the gears in three or more stages may be enabled by setting the number of feet of the brush 83 and the pattern of the code plate 84.

Having described the hardware of the present embodiment, the software will now be described. First, the software of the microcomputer μC1 in the body will be described.

When the battery E1 is mounted on the camera body BD, the battery mounting detection switch S _RE1 (see FIG. 3) is turned off, the reset capacitor C1 is charged via the resistor R1, and the microcomputer in the body that controls the entire camera. μC1 reset pin RE1
, A reset signal that changes from a “Low” level to a “High” level is input. By inputting this reset signal,
The microcomputer μC1 in the body starts the clock generation by the internal hardware, operates the DC / DC converter DD, is supplied with the drivable voltage V _DD , and executes the reset routine shown in FIG. It is. In a stop state (a halt state) described later, the clock of the microcomputer μC1 in the body is stopped, and the operation of the DC / DC converter DD is also stopped. In the same manner as when the battery is mounted, the generation of the clock and the operation of the DC / DC converter DD are started by hardware inside the microcomputer μC1 in the body.

In the reset routine of FIG. 5, first, all interrupts are prohibited, various ports and registers are reset, and a flag RSTF indicating that the reset routine has been passed is set (# 5 to # 15). Then, it is determined whether or not the main switch _SM is ON (# 20). Main switch S _M is
When changing from ON to OFF or from OFF to ON, the interrupt SMINT by the operation of the main switch is executed from # 20. When the main switch _SM is ON at # 20,
Allow all interrupts, to reset the flag RSTF indicating that through the reset routine, turning ON the transistor Tr _1, Tr ₂ for feeding current to each circuit and the lens-side, power control terminals PW1, PW2 (output port) is set to “High” level (# 25 to # 35).

Then, a subroutine for AF lens retraction is executed (# 40). This subroutine is shown in FIG. When this subroutine is called, first, the subroutine of lens communication II is executed (# 150).

The lens communication II is a communication mode for inputting data from a new-type lens (hereinafter, referred to as a “new lens”) described in the present embodiment in the communication mode with the lens. This subroutine is shown in FIG. When this subroutine is called, first, data indicating that the communication mode is mode II is set, the terminal CSLE is set to "Low" level, and the lens is informed that data communication is to be performed (# 400, # 40).
2). Then, 2-byte serial communication is performed (# 40
Five). At this time, the body and the lens simultaneously input data transmitted from the other party serially while outputting data serially to the other party. The first byte outputs data indicating the type of the body from the body. At this time,
The lens outputs meaningless data FF _H (the subscript _H indicates a hexadecimal number), and the lens and the body input data sent from the other party. The second byte outputs data indicating the type of lens (new lens / old lens, etc.) from the lens. At this time, data meaningless from the body
FF _H is output, and the lens and body each input data sent from the other party. Then, in order to indicate that the communication mode with the lens is mode II, 1-byte data of the communication mode set above is output to the lens, and after a short wait, it is determined whether or not the lens is an old lens. If so, 6-byte data is input from the lens, the terminal CSLE is set to the "High" level, and the routine returns (# 416 to # 418).
In # 416, if it is a new lens, input 12 bytes of data from the lens, set the terminal CSLE to “High” level,
Return (# 410 to # 425).

Here, the contents of the communication data between the body and the lens in the present embodiment will be described.

First, in lens communication with the old lens, lens-specific data is sent from the lens to the body, and the contents include (i) the maximum aperture value AVo, (ii) the maximum aperture value AVmax,
(Iii) Defocus amount-drive amount conversion coefficient K _L , (iv) focal length f, (v) lens attachment signal, (vi) extension amount-
This is the distance conversion coefficient K _N.

Lens communication with a new lens includes lens communication in modes I to V. Hereinafter, each mode will be described.

In the mode I lens communication, data indicating the zoom rewind mode is sent from the body to the lens.

In the mode II lens communication, the above data (i) to (vi) are sent from the lens to the body as lens-specific data, and (vi)
i) a lens switch S _Q state, auto zoom program mode, ON / OFF of the zoom switch, (viii) the shortest focal length fmin, (ix) the longest focal length fmax, the target focal length fc in (x) AZP mode, ( xi) As data for display in the viewfinder, data (1 bit) indicating whether or not the setting when the zoom mode is the reset mode is completed, AZ
Data indicating the presence / absence of warning data in P1 mode (1
Bit), data (2 bits) indicating the set state of the AZP2 mode (non-set, 1-point set, 2-point set), (xi
i) The amount of focus lens correction (M
f) is sent.

In mode III lens communication, from the body to the lens,
(Xiii) Zoom enable / disable, reset Yes / No, Yes / No focusing, (xiv) feed amount N from the infinity position N _F, (x
v) Data indicating the focal length f is sent.

In the mode IV lens communication, a signal for changing the terminal CSLE to the “Low” level is transmitted from the body to the lens in the control of the during-exposure zoom.

In mode V lens communication, from lens to body,
(Xvi) Data indicating sleep permission / prohibition is transmitted.

Each of the above data (i) to (xvi) is input and output as 1-byte data.

Returning to the flow of FIG. 6, the value of the counter N indicating the driving amount of the focus adjustment lens group (hereinafter, referred to as “AF lens”) is set to −N _LG (a negative value having a large absolute value. Is determined according to 0 or 1), and a motor driving subroutine for AF is executed (# 152, # 155).

Here, a lens driving subroutine is shown in FIG.
When this subroutine is called, it is determined whether or not the sign of the lens drive amount N is positive (whether or not the first bit is 1) so as to detect that the lens has reached the end. If it is positive, the extension direction is set as the driving direction of the lens. If not, the respective signals are output to the motor drive circuit MD1 and the process returns (# 1197 to # 119).
9).

In this embodiment, the driving of the AF lens is controlled by a counter interrupt and a timer interrupt. Here, the counter interrupt is executed when a pulse indicating the driving of the AF lens from the encoder ENC is input, and the timer interrupt is performed when there is no next counter interrupt within a predetermined time after the counter interrupt is performed. Is executed. Then, it detects that the lens has reached the terminal end (infinity end or closest end) by this timer interruption. The reason for setting N = −N _{LG in} # 152 is to prevent the lens from being stopped due to N = 0 due to the counter interruption. This is, in other words, N = −N
_This means that there is no lens having a drive amount that causes _LG . Then, the timer interruption is permitted, and the control waits until the flag LEEDF indicating that the lens has reached the end by the timer interruption is set (# 160, # 165). The flag LEEDF is set, the lens though renormalized to infinity position, resets the movement amount N _F of counting counter (described later) from infinity position of the lens, the flag LEEDF
Is reset (# 170, # 175). Then, a flag RSTF indicating that the operation has shifted to the AF lens retraction by mounting the battery.
It is determined whether or not is set, and if the flag RSTF is set, the process returns with the AF lens retracted to the infinite position (# 180). When the flag RSTF is not set, AF by OFF of the main switch S _M
It is determined whether or not the flag SMOFF indicating that the lens shift has been set is set. If the flag SMOFF is set, the process returns with the AF lens set to the infinity position (# 185). When the flag SMOFF is not set, so it is that the transition to the retraction AF lens by ON of the main switch S _M, calculates the movement amount N _K for feeding the AF lens to a specific position (# 190). The feeding amount N _K is the imaging magnification beta = 1/6
0, the shooting distance when the focal length is f = 80 mm is D = f /
β = 60 × 80mm = 4.8m, this shooting distance D = 4.8m
Is divided by the extension amount input from the lens and the distance conversion coefficient K _N to calculate as N _K = D / K _N. AF this extension amount N _K
The value is substituted into a counter N indicating the lens driving amount, the lens is driven, and the process returns (# 195, # 200).

Next, the above counter interrupt is shown in FIG. Encoder
When a pulse from the ENC is input, the counter interrupt shown in FIG. 7 is executed. First, 1 is subtracted from the absolute value ABS (N) of the counter N indicating the driving amount of the AF lens to newly set the value of the counter N, and the timer T1 for timer interruption is reset and started (# 250, # 255). ). And
It is determined whether or not the value of the counter N has become 0. If N = 0, it is determined that a predetermined amount of lens driving has been completed, the AF lens stop subroutine is executed, and the routine returns. Return without stopping (# 26
0, # 265).

Next, the timer interruption is shown in FIG. When the timer T1 reset and started by the above counter interrupt reaches a predetermined value, the timer interrupt shown in FIG. 8 is executed.
First, assuming that the AF lens has reached the terminal end (infinity end or nearest end), the AF lens stop subroutine is executed, a flag LEEDF indicating that this flow has been passed is set, and timer interruption is prohibited (# 300 to # 310). Then, it is determined whether or not the flag (LSF) indicating that the low contrast scan is being performed is set. If not, the process returns (# 311). If it is set, it is determined whether or not the drive during low-con scan is advanced. If it is advanced (FMF = 0), this flag FMF is set and the process returns (# 311 to # 313). As a result, renormalization control is performed next. If the flag (FMF) is not set, the low contrast scan is prohibited, a flag (LSINF) indicating this is set, and the routine returns (# 314).

FIG. 9 shows a subroutine for stopping the AF lens called at step # 265 or # 300. When this subroutine is called, first, to stop the AF motor M1, the AF
Motor drive circuit sends control signal to short-circuit both ends of motor M1
Output 10 ms to MD1 (# 350). Then, a control signal for turning off the power supply to the AF motor M1 is output to the motor drive circuit MD1, the lens driving flag LMVF is reset, and the process returns (# 355, # 356).

Returning to the flow of FIG. 5, it is determined whether or not the lens is an old lens. If the lens is not an old lens, a reentrant mode II is designated as a mode for initially setting the zoom lens to a specific position. (# 41, # 4
2, # 45), proceed to # 50. FIG. 10 shows a subroutine for this zoom lens retraction. When this subroutine is called, first, the interrupt CSLEINT by the lens select signal CSLE from the lens is prohibited, the subroutine of lens communication I is executed, the data of the repetition mode is output, and the lens is connected to the terminal CSLE of the camera. Wait for the signal of the "1" to become "Low" level (# 370 to # 385). This “Low” level signal is output from the lens when the zoom lens is set at a specific position. When the signal from the lens to the terminal CSLE of the camera goes to the “Low” level, an interrupt from the lens CSLEINT
And return (# 390).

Next, the subroutine of lens communication I is shown in FIG.
When this subroutine is called, first, data indicating the communication mode I is set, the terminal CSLE is set to the “Low” level, and two-byte data communication is performed to mutually inform the types of the camera and the lens. Next, in order to indicate the communication mode (here, mode I), one-byte data communication is performed, the terminal CSLE is set to the “High” level, and the process returns (# 430 to # 445).

Returning to the flow of FIG. 5, if it is an old lens in # 41, #
Go to 50. In # 50, it is determined whether or not the shooting preparation switch S1 is ON. If the shooting preparation switch S1 is not turned on in # 50, the flow proceeds to # 65 and the power supply transistor Tr ₁ ,
In order to turn OFF the tr _2, respectively the power control terminals PW1, PW2 "Low"
And the power supply control terminal PW0 is set to the “Low” level in order to stop the operation of the DC / DC converter DD (# 65, # 7
0). If the shooting preparation switch S1 is ON in # 50, # 5
Proceed to 2 and flag indicating low contrast scan prohibition (LSINF)
Is reset, and the subroutine of S1ON is executed in # 55.
After that, it is determined whether or not the flag S1ONF, which is set for 5 seconds while the shooting preparation switch S1 is ON or OFF, is set.
If it is not set, proceed to # 65 (# 60). In an interrupt S1INT executed when the shooting preparation switch S1 is turned from OFF to ON, processing from # 55 is executed. In the lens interrupt CSLEINT executed when an interrupt signal is input from the lens to the interrupt terminal LEINT, the flag CSLEF indicating that an interrupt has been made from the lens is set in # 75, and # 5
Execute the process from 5.

The S1ON subroutine is shown in FIG. When this subroutine is called, first, a flag S1ONF indicating that this flow has been passed is set, the interrupt S1INT is disabled, and the power supply control terminal PW is turned on to turn on the power supply transistors Tr ₁ and Tr _2.
1, PW2 is set to "High" level, and a lens control subroutine is executed (# 500 to # 515).

Here, the lens control subroutine is shown in FIG.
When this subroutine is called, first, data of zoom permission is set, the subroutine of lens communication II is executed, and predetermined data is input from the lens (# 700, # 70).
Five). Next, a subroutine of battery check BC is executed (# 715). FIG. 17 shows this battery check subroutine. When the subroutine is called, first, data is input from the battery check circuit BC1 (# 855). From the battery check circuit BC1,
Data indicating whether or not the battery voltage is at a level sufficient to control the camera (is equal to or higher than level LV1) is input. From this data, it is determined whether or not the battery voltage is equal to or higher than the level LV1. If the battery voltage is equal to or higher than the level LV1, the data indicating the battery voltage level is set to BCLV = 1 and the process returns (# 85).
5, # 885). If the battery voltage is lower than the level LV1 in # 855, the data indicating the battery voltage level is set to BCLV = 0 and the process returns (# 860, # 880).

Returning to the flow of FIG. 14, when the battery check subroutine (# 715) is completed, it is determined at # 720 whether or not the lens is an old lens. It is determined whether or not BCLV = 0.
If BCLV = 0 in # 810, a warning display indicating that the battery voltage is insufficient is performed, other displays are erased, and an interrupt is awaited (# 815 to # 820). The display state at this time is
It is shown in FIG. In this state, the battery mark is blinking. If BCLV is not 0 in # 810, the flow proceeds to # 825, the above-mentioned warning display is deleted, and the routine returns. FIG. 55 (a) shows a state of full display. In the figure, "CD" is displayed when the card function is working, and is erased when the card function is not working. As will be described later, when the card function does not work well and the release lock is established, the display of "CD" flashes as shown in FIG. 55 (b). In the figure, the value “1000” indicates that the shutter speed is 1/1
000 seconds, and the numerical value “5.6” indicates that the aperture value is F5.6.

If the lens is not the old lens in # 720, it is determined whether or not the data indicating the battery voltage level is BCLV ≠ 0. If BCLV = 0 in # 725, the data of the zoom inhibition is set in # 730, and the process proceeds to # 800, where the subroutine of the lens communication III for outputting this data to the lens is executed, and # 8 is executed.
Go to 10.

The subroutine of this lens communication III is shown in FIG.
When this subroutine is called, first, data indicating that the communication mode is mode III is set, and terminal CSL is set.
With E set to “Low” level, 2-byte data communication is performed to mutually inform the camera and lens type.
Next, to indicate the communication mode (here, mode III),
One-byte data communication is performed, and after a short wait, 3-byte data is output to the lens, the terminal CSLE is set to the “High” level, and the process returns (# 900 to # 925).

Returning to the flow of FIG. 14, when the data indicating the battery voltage is BCLV ≠ 0 in # 725, the process proceeds to # 734 and thereafter,
Determine the zoom mode. First, in # 734, it is determined whether or not the camera is in the OFF mode (manual zoom mode). # 734
If it is determined that the mode is the OFF mode, OFF at # 736
The mode subroutine is executed, and the routine proceeds to # 800. # 7
If it is determined in 34 that the mode is not the OFF mode, it is determined whether or not the mode is the reset mode in # 738. If it is determined in # 738 that the current mode is the reset mode, the subroutine of the reset mode is executed in # 740, and the process proceeds to # 800. If it is determined in step # 738 that the camera is not in the reset mode, the camera is in the auto-zoom program (AZP) mode and the camera does not need to control anything.

Next, the OFF mode subroutine is shown in FIG. First, it is determined whether or not a zoom switch (abbreviated as “Z · SW” in the figure) is ON based on data input from the lens (# 742). If the zoom switch has not been turned on, it is determined whether or not the flag ZMF indicating that the zoom switch has been once turned on has been set, and if so, the zoom switch has changed from ON to OFF. The flag ZMF is reset, the flag AFOMF indicating that the focus detection is performed again is set, and the process proceeds to # 750 (# 744 to # 748). If the flag ZMF is not set at # 744, it is determined that the zoom switch remains OFF, and the process proceeds to # 750. # In 750, it is determined whether the focal length f, which is set in the reset mode, the lens switch S _Q which is operated in order to return to the photographing distance D is ON, when the lens switch S _Q is not ON Will return immediately. If the lens switch _SQ is ON, the process proceeds to step # 752, where it is determined whether or not the setting of the focal length f and the photographing distance D is completed based on data input from the lens, and the setting is completed. If not, return immediately. If # set at 752 is completed, the feeding amount N _F from the infinity position to the current lens position, is subtracted from the reset value N _R of the feed amount at the time of setting the photographing distance D between the focal length f Then, the lens drive amount N1 is calculated, the in-focus display is erased, and the lens is driven by the above-described lens drive amount N1 (see FIG. 24). When the drive is completed (LMVF = 0), the process returns (# 754 to # 760).

Next, FIG. 16 shows a reset mode subroutine. When the subroutine is called, first, it is determined whether or not a flag AFEF indicating that the object is in focus at # 770 is set. # (If not in focus) when 770 flag AFEF is not set, as not to set the reset value N _R of the feed amount, and immediately return. # The 770 when the flag AFEF is set in (when focused), data input whether the setting of the reset value N _R of the amount feeding at # 772 has been completed from the lens (the ( xi)), and if the setting is completed, return. If the setting is not completed in # 772, the lens switch S _Q is set in # 774.
It is determined whether or not is turned on. If the lens switch S _Q is ON in # 774, it is determined whether the flag SQONF indicating that lens switch S _Q has been once ON in # 776 is set, the flag SQONF is set If you are as set reset value S _Q is completed, the process returns. When the flag SQONF is not set in # 776, and sets the feeding amount N _F from the infinity position to the current lens position as a reset value N _R, flag SQ
Set ONF and return (# 778, # 780). # 774
If the lens switch _SQ is not turned on at # 782
To determine whether or not the flag SQONF is set. When the flag SQONF is set in # 782, the lens switch S _Q is as turned OFF from ON, the flow returns to the reset flag SQONF (# 784). Further, when the flag SQONF in # 782 is not set, the switch S _Q is continuing the state OFF, the routine returns.

Returning to the flow of FIG. 13, when the execution of the lens control subroutine is completed, the card communication I subroutine is executed (# 520). This card communication I subroutine is the first
Figure 9 shows. When this subroutine is called,
In order to notify the card that data communication is performed with the card, the terminal CSCD is set to the "Low" level, and data indicating mode I card communication is set. Then, the mode is set to the output mode, serial data communication is performed once, and the card side is notified of the mode I card communication (# 930 to # 936). Then, the card waits for the time required for the predetermined processing to be performed, performs serial data communication once, sets the terminal CSCD to the “High” level to notify the card of the end of the data communication, and returns (# 938- # 942). The data exchanged at # 940
Shows the ON / OFF state of the card switch S _CD on the camera side.

Returning to the flow of FIG. 13, the microcomputer μC1 in the body
After waiting for the time required for control performed by the card side upon receiving the above data, the card communication II subroutine is executed (# 52).
5, # 530). The card communication II subroutine is shown in FIG. When this subroutine is called, first, the terminal CSCD is set to the "Low" level to set the card as a data communication target, and data indicating the mode II card communication is set. Then, the mode is set to the output mode, the serial input / output is executed once, and the card side is notified of the mode II card communication (# 944 to # 950). Next, the mode is changed to the input mode, the time required for control on the card side is waited, serial input / output is performed once, and data regarding the presence or absence of card control (card control means that the exposure of the camera and the like are set by the card side). Input based on the data) and return the terminal CSCD to the “High” level in order to indicate the end of data communication with the card (# 9).
55 to # 970).

Returning to the flow of FIG. 13, when the subroutine of the card communication II is completed, the photographing preparation switch S1 is turned on at # 535.
It is determined whether or not the photographing preparation switch S1 is ON, and the subroutine of the AF control is executed (# 540).

FIG. 23 shows a subroutine of this AF control. When this subroutine is called, first, the microcomputer μC1 resets the warning display and sets a flag LS indicating low-con scan prohibition.
It is determined whether or not INF is set (# 1100, # 11
01). If the flag LSINF has been set, the process proceeds to # 1116, and only focus correction by power zoom is performed (described later). If the flag LSINF has not been set, it is determined whether or not the flag AFEF indicating focus has been set. If the flag AFINF has been set, the process proceeds to # 1125 with N1 = 0 (# 1102, # 1112). If the flag AFEF is not set, a subroutine for correlation calculation is executed (# 110
Four).

This subroutine is shown in FIG. When this subroutine is called, the microcomputer μC1
Let the CCD in the _CT perform integration (charge accumulation).
The data converted into a digital signal is input (data dump), a correlation operation is performed from this data, and the process returns (# 1230 to # 1235). The specific calculation method of the correlation calculation is
For example, JP-A-62-150310, U.S. Pat.
No. 4 discloses this.

Returning to the flow of FIG. 23, when the subroutine of the correlation calculation is completed in # 1104, it is determined whether or not the focus can not be detected from the calculation result, and if not, the defocus amount DF is calculated. obtains the defocus amount DF lens drive amount N1 = DF × K _L from flag LS that indicates the low contrast scan
F is reset, and the process proceeds to # 1125 (# 1106 to # 1110).
In # 1125, it is determined whether the flag ZMF is set. When # 1125 flag ZMF is set, using a lens corrected driving data M _F inputted from the lens, in order to correct the deviation of focus by the focal length change,
Calculating a driving amount N2 = M _F -N _F of the AF lens. And
In step # 1140, the driving amount N is obtained by N = N1 + N2, and the process proceeds to step # 1185 in order to erase the in-focus display during zooming. In # 1125,
When the flag ZMF is not set, that is, when the zoom operation is not performed, the process proceeds to # 1142, and it is determined whether the flag AFEF indicating the focus is set. Flag AF
When EF is set, the process proceeds to # 1145, and it is determined whether or not the mode is the reset mode. If it is the reset mode in # 1145, the process returns without doing anything. When not in the reset mode, proceed to # 1146 to execute the AZP mode (AZP1
Mode or AZP2 mode).
If it is the mode, the process proceeds to # 1135 to correct the focus shift due to zooming. If the mode is not the AZP mode, the process proceeds to # 1147, and it is determined whether or not the flag AFOMF for performing the AF again is set. If the flag AFOMF is set in # 1147, the flag AFOMF is reset and the defocus amount is calculated (# 1150, # 1155). as a result,
If the defocus amount DF exceeds the predetermined value K, focus determination and lens driving are not performed, and warning display data is set.
Proceed to # 1194 (# 1161). On the other hand, if the defocus amount DF is equal to or smaller than the predetermined value K, the process proceeds to # 1165 to correct the amount of defocus due to zoom driving, and the AF operation is performed again (# 1147 to # 1165). In # 1165, it is determined whether or not focusing is performed based on the obtained defocus amount DF. If the camera is in focus at # 1165, the focus is displayed and the focus flag AFEF is set.
Proceed to 1194 (# 1168, # 1169). If it is not in focus at # 1165, the drive amount N1 obtained at # 1110 is set as the lens drive amount, and the process proceeds to # 1185 (# 1166). If the flag AFEF indicating in-focus is not set in # 1142, the steps from # 1165 are executed. In step # 1147, if the flag AFOMF indicating that the above-described AF is to be performed again is not set, the flow shifts to step # 1194. After # 1185, the focus indication is turned off, the timer interrupt is allowed,
The lens is driven, and the process proceeds to # 1194 (# 1185 to # 11
92). In # 1194, it is determined whether there is warning data,
If the warning data has been set, a warning display is performed at # 1196. If no warning data has been set, the warning display is deleted at # 1198, and the routine returns.

In # 1106, if it is determined that the focus cannot be detected, # 11
Proceed to 14 to determine whether or not a zoom operation has been performed. If the zoom operation has been performed (ZMF = 1), low-con scan (focus detection is performed while moving the AF lens, and a focus detectable area (lens position) ), And zooming is prioritized. This is to reflect the photographer's intention (manual operation) with the highest priority. In # 1116, in correcting only the amount shifted by the zooming, and calculates N2 = M _F -N _F, by substituting N2 to drive quantity N proceeds to # 1185. If there is no zoom operation in # 1114 (ZMF = 0), a low-con scan subroutine is executed in # 1120 and the routine returns.

The low contrast scan subroutine is shown in FIG. When this subroutine is called, first, a timer interrupt is enabled, a flag LSF indicating low-con scan is set, and if the flag FMF is not set, the lens drive amount is set to N = N _LG as the extension direction, and a flag is set. If FMF is set, the lens drive amount is set to N
= −N _LG , the lens driving subroutine is executed, and the process returns (# 1171 to # 1176).

Since the old lens does not have the function of the new lens, the conventional AF operation is performed when the old lens is used.

Returning to the flow of FIG. 13, the AF control subroutine (#
After execution of step 540), the process proceeds to step # 560. If the shooting preparation switch S1 is not turned on in # 535, it is determined whether or not the flag LMVE indicating that the AF lens is being driven is set (# 545). When the flag LMVF is set, execute the AF lens stop subroutine at # 550,
If the flag LMLF is not set, the process skips step # 550 and proceeds to step # 555. In # 555, the flag (LSINF) indicating low-con scan prohibition is reset, and the flow proceeds to # 560. In step # 560, the film sensitivity SV is input from the film sensitivity reading circuit DX, and the luminance BVo of the subject at the full aperture is input from the photometric circuit LM. Explaining this data input, first, the terminal CSDX or CSLM is set to the “Low” level, and a circuit (DX or LM) for inputting data is selected. Then, data is input from the terminal SIN. When the data input is completed, the terminal CSDX or CSLM is set to the “High” level, and the data input ends. Subsequently, a card communication III subroutine is executed to send the input data and the like to the card (# 560 to # 570). The subroutine of this card communication III is shown in FIG. When this subroutine is called, first, the terminal CSCD is set to the "Low" level to indicate a data communication request to the card, and data indicating mode III card communication is set (# 975, # 980). Then, the output mode is set, the serial data communication is performed once, the card waits for a time for performing necessary calculations, the serial communication is performed seven times, the terminal CSCD is set to the “High” level, and the data communication is performed to the card. The process returns to indicate the end (# 985 to # 1010). The data communicated in # 1005 of this subroutine are the current focal length fp, the minimum focal length fmin, the maximum focal length fmax, the photometric value BVo, the film sensitivity SV, the open aperture value AVo, and the maximum aperture value AVmax. is there.

Returning to the flow of FIG. 13, the microcomputer μC1 in the body is # 57
In step 5, the exposure calculation subroutine (FIG. 27) is executed. When this subroutine is called, first, the exposure value EV, EV =
Calculate with BVo + AVo + SV. BVo is the subject luminance value measured by open metering, AVo is the open aperture value, and SV is the film sensitivity. A shutter speed TV and an aperture value AV are calculated from the exposure value EV based on a predetermined AE program chart, and the process returns (# 1285, # 1290). A specific example of this AE program diagram is disclosed in, for example, Japanese Patent Application Laid-Open No. 1-129238.
After executing the exposure calculation subroutine, the microcomputer μC1 in the body executes the card communication IV subroutine (the 22nd) in order to input the exposure value calculated by the card and other information.
(Figure 580). This subroutine is almost the same as the card communication II subroutine (Fig. 20), except that the communication mode set in # 1020 is mode IV and the serial communication of # 1045 is performed three times. Detailed description is omitted. The data input from the card side to the body in the card communication IV are the card measurement calculation shutter speed TV _CD , the card side calculation aperture value AV _CD , and the presence or absence of the release lock.

After executing this card communication IV subroutine, the microcomputer μC1 in the body determines whether or not to perform exposure control based on the data on the card based on the data obtained in the card communication IV subroutine and the data before that. A determination is made based on this (# 585). FIG. 28 shows a subroutine for this card control determination. When the subroutine is called, it is determined whether or not to perform card control based on the data on the presence or absence of card control input from the card to the body by the card communication II (# 1305). When performing card control, the shutter speed TV _CD and the aperture value AV _CD calculated on the card side are set as the control shutter speed TVc and the control aperture value AVc, respectively (# 1310, # 1315). On the other hand, when performing camera-side control, the control shutter speed TVc,
The control aperture value AVc is calculated on the camera side (# 57).
5) The set shutter speed TV and aperture value AV are set, and the process returns (# 1320, # 1325).

Returning to the flow of FIG. 13, when the microcomputer μC1 in the body finishes the card control determination, the control shutter speed TVc,
Data such as the control aperture value AVc, the presence or absence of a card function (the presence or absence of card control), the presence or absence of a release lock, and the result of a battery check are serially output to the display control circuit DISPC. Then, display is performed by the display unit DISP _I on the body and the display unit DISP _II in the viewfinder (# 590). Fig. 55 (a)
(C) shows the display contents of the display unit DISP _I on the body. Since the display contents have been described earlier,
Here, it is omitted. FIGS. 56 (a) to 56 (i) show the display contents of the display unit DISP _II in the viewfinder. In FIG. 56 (a), in the numerical display, the shutter speed is displayed in four digits from the left, and the aperture value is displayed in the next two digits. These values are displayed based on data serially output from the microcomputer μC1 in the body to the display control circuit DISPC. Display control circuit DISPC from microcomputer μC1 in body
In addition to the shutter speed and aperture value data, there are data for zoom mode display, and the display control circuit DI based on this data.
SPC displays zoom mode. In the case of the auto zoom program mode I, as shown in FIG.
"I" is displayed, and in the case of the auto zoom program mode II, "AZP II" is displayed as shown in FIG. 4D, and in the case of the manual zoom mode, as shown in FIG. In the reset mode, “MZ” is displayed, and in the reset mode, “RST” is displayed, as shown in Fig. 11 (h). If the warning data set when the data is included in the data for displaying the zoom mode, the display of "AZP I" blinks as shown in FIG. If the photographing magnification β of the point is set, “AZP II ⁰ ” is displayed as shown in FIG. 11E, and if the second photographing magnification β is set, the image is displayed as shown in FIG. as shown, the display of "AZP II _{⁰ 0",} further, if finished configuring the reset mode, as shown in FIG. (i) , "RS
T ₀ "is displayed.

In the flow of FIG. 13, when the above display is finished in # 590, it is determined in # 595 whether or not the release switch S2 is ON. If the release switch S2 is ON, it is determined at # 600 whether or not the zoom is being performed by the flag LMVF. If the zoom is being performed (LMVF = 1), the process proceeds to step # 635 to prohibit the release. . If zooming is not being performed at # 600 (LMVF = 0), it is determined at step # 610 whether or not the lens is focused by the flag AFEF, and the lens is focused (AFEF = 1)
In this case, the process proceeds to step # 612. If the subject is out of focus (AFEF = 0), the process proceeds to step # 635 to prohibit the release. At # 612, it is determined whether or not release lock data input from the card exists. If release lock data exists, the process proceeds to step # 635 to prohibit release. On the other hand, if the release lock data does not exist, the process proceeds to # 617, all interrupts are prohibited, exposure control is performed, and after the exposure control is completed, the film is wound up by one frame (# 617 to # 625). Then, in order to indicate that the subroutine of S1ON has been completed, the flag S1ONF is reset, the interruption S1INT by turning on the photographing preparation switch S1 and the interruption CSLEINT from the lens are permitted, and the routine returns (# 630, # 632). .

In the flow of FIG. 13, the release switch S is set at # 595.
Even if 2 is not ON, proceed to # 635. In # 635, it is determined whether or not the shooting preparation switch S1 is ON. If the shooting preparation switch S1 is ON, the timer T2 for holding the power is reset and started in # 640, and the process returns. On the other hand, when the shooting preparation switch S1 is not turned on, it is determined in step # 650 whether or not the zoom is being performed by the flag LMVF. If zooming is being performed at # 650 (LMVF = 1), the process proceeds to # 640, where the timer T2 is reset and started, and the power holding time is extended. Also, if you are not zooming in # 650,
At # 655, it is determined whether or not the timer T2 for holding power has counted 5 seconds. If 5 seconds have not elapsed, the process returns. If 5 seconds have elapsed, the process proceeds to step # 630, where the control for terminating the photographing by turning off the photographing preparation switch S1 is performed.

Next, the exposure control subroutine (# 620) executed in # 620 is shown in FIG. When the subroutine is called, first, a predetermined control signal is output to control the release (# 1330). As a result, the locking portion (not shown) is released, and a release operation such as a mirror-up operation is performed. Next, the aperture is narrowed down to the aperture indicated by the control aperture value AVc (# 1332). Then, a subroutine of lens communication IV is executed to output a signal indicating the release to the lens side (# 1335).

This subroutine is shown in FIG. When this subroutine is called, first, data indicating the communication IV is set, the terminal CSLE is set to the “Low” level, and the lens circuit is selected as the communication partner. Then, two-byte serial communication is performed in order to mutually inform the types of the camera and the lens. Next, 1-byte serial communication is performed to indicate the communication mode (here, mode IV). When the above data communication is completed, the terminal CSLE is set to “High” level,
Return (# 1400 to # 1415).

Next, the microcomputer μC1 in the body waits for the mirror-up to be completed. When the mirror-up is completed, the microcomputer μC1 runs one curtain. Then, the timer T3 for counting the actual exposure time Ts according to the shutter speed TVc is reset and started (# 1340 to # 1350). Next, in # 1355, it is determined whether or not card control is performed. In the case of card control, that is, in the case where zooming between exposures is possible, the above exposure time Ts
(1/3) elapses, and when (1/3) Ts elapses, the terminal CSLE is momentarily set to the “Low” level, and the exposure time Ts elapses (# 1340 to # 1370). In step # 1365, the terminal CSLE is momentarily set to the “Low” level, so that the lens side starts driving the zoom lens. If it is not card control in # 1355, skip # 1360 and # 1365 and proceed to # 1370 to wait for the exposure time Ts to elapse. If the exposure time Ts elapses, the second curtain is driven, the second curtain is waited for the time to complete, the terminal CSLE is momentarily set to the “Low” level again, and the end of the release is returned (# 1375 to # 1380). . #
By setting the terminal CSEL to the “Low” level for a moment at 1380,
The lens stops driving the zoom lens.

 This concludes the description of step # 55 in FIG.

Returning to the flow of FIG. 5, the main switch S _M is turned on at # 20.
Otherwise, the process proceeds to # 80, and prohibits an interrupt other than the interrupt SMINT by ON of the main switch S _M, determines whether the chill is set flag RSTF of a battery mounted in a # 85. flag
When RSTF is not set, the main switch S _M
As a result, this flow is executed, and a flag SMOFF indicating this is set, and a subroutine for AF lens retraction is executed (# 87, # 90). In this case, the AF lens is retracted to the most retracted position. Since this point has already been described, detailed description is omitted. next,#
At 92, it is determined whether or not the lens to be used is an old lens. If not, the retraction mode is set to mode I, and the zoom lens retraction subroutine is executed (# 95, # 1).
00). When the retraction mode is set to mode I, by executing the zoom lens retraction subroutine, the AF lens and the zoom lens are moved to the most retracted position, and the size of the entire camera including the lens ( Length) is the smallest. And lens communication V
Is executed, and it is determined whether or not the camera can enter the sleep mode based on the data input from the lens (# 105, # 110). When the camera enters the sleep mode, power supply to the zoom motor on the lens is cut off. Therefore, when the zoom retraction control is being executed on the lens side, the sleep mode must not be entered, so wait for 50 msec to elapse at # 115, return to # 105, and execute the lens communication V subroutine, Repeat the judgment of 110. When the zoom retraction control ends on the lens side, it is determined that the sleep mode may be entered in # 110, and the transistors Tr ₁ and Tr ₂ that supply power to the camera side circuit and the lens zoom motor are turned off. Terminals PW1 and PW2 are set to “Low” level, and DC / DC converter
In order to turn OFF the DD, the terminal PW0 as "Low" level, and stops prohibit an interrupt other than the interrupt SMINT by ON of the main switch S _M (in sleep mode) (# 120 to # 13
0). If the flag RSTF is set in # 85, or if it is determined in # 92 that the lens to be used is an old lens, the process proceeds to # 93, and a flag indicating that a battery is installed is set.
Reset RSTF. Then, the process proceeds to # 120 and thereafter, and enters the sleep mode.

Here, the operation of the lens communication V will be described with reference to FIG.

When this subroutine is called, first, data indicating that the communication mode is mode V is set,
The CSLE is set to the “Low” level to notify the lens that data communication will be performed (# 1420, # 1422). Then, serial communication of 2 bytes is performed (# 1425), and the type of the lens and the body are transmitted to the body and the lens. Then, in order to indicate that the communication mode is mode V, data (1 byte) indicating the communication mode is output to the lens (# 1430), and a short wait is made (# 1435). Thereafter, 1-byte data (including data indicating sleep permission / prohibition) is input from the lens (# 1440), and the terminal CSLE is set to the “High” level (# 144).
5), return.

Next, a control operation by the microcomputer μC2 in the lens will be described. Lens when not attached to the camera body, the lens mounting detecting switch S _LE is turned ON, the reset terminal RE2 in the lens microcomputer μC2 is maintained at "Low" level, the circuit of the lens is not driven at all. When the lens is attached to the camera body, the lens attachment detection switch S _LE is turned off and “Lo” is applied to the reset terminal RE2.
A signal that changes from "w" level to "High" level is input.
Thereby, the microcomputer μC2 in the lens executes the reset routine shown in FIG. First, the microcomputer μ in the lens
C2 resets ports and registers. At this time, AZ
P1 mode and sleep enabled state. Then, the zoom lens retracting mode is set to mode II (mode for retracting to the predetermined position f = 80 mm), and the zoom lens retracting subroutine is executed (# L5 to # L15).

FIG. 32 shows a subroutine for this zoom lens retraction. When the subroutine is called, first, a flag ZIF indicating the zoom lens retraction mode is set, and a signal for setting the zoom lens retraction speed to the highest speed V3 is output to the motor drive circuit MD3. And the control focal length f
c is set to a small value that cannot be obtained, the drive I subroutine is executed, and the zoom lens is driven (# L30 to # L4
0). The drive I subroutine will be described later.
Then, a flag TINT indicating that a timer interrupt has occurred
Wait for F to be set (# L45). This timer interrupt is an interrupt that occurs after the zoom lens reaches the end.

Here, a process until the flag TINTF is set will be described. First, FIG. 33 shows a counter interrupt routine executed when a pulse is input from the encoder ENC3 for detecting the amount of rotation of the zoom motor M3. When this interrupt occurs, the microcomputer μC2 in the lens permits a timer interrupt for detecting that the zoom lens has reached the end, and resets and starts the timer (# L100, # L10
Five). Then, it is determined whether or not the flag ZIF indicating that the zooming is being performed is set. If the flag ZIF is set, the process returns (# L110). Note that the flag ZI
The operation when F is reset will be described later. When the zoom lens is retracted and reaches the end, this counter interrupt is not executed, and the timer reset and started in # L105 continues to count time, and when a certain time is reached, a timer interrupt occurs.

FIG. 35 shows this timer interrupt routine. When this interrupt occurs, first, the count value Zc of the zoom counter ZC
Is reset (# L200). This zoom counter ZC
The pulse from the encoder ENC3 is counted. When the zoom lens is moved in, the pulse is counted down by the pulse from the encoder ENC3, and when the zoom lens is moved out, the pulse is counted up by the pulse from the encoder ENC3. After resetting the count value Zc of the zoom counter, the zoom lens is stopped, the timer interrupt is prohibited, the flag TINTF is set, and the process returns (# L205 to # L215).

Here, the subroutine for stopping the zoom lens is shown in FIG. When this subroutine is called, first, a stop signal is output to the motor drive circuit MD3 for 10 msec, then a drive OFF signal is output, sleep is enabled, the flag ZMVF indicating that zoom driving is being performed is reset, and the process returns ( # L180
~ # L187).

As described above, the flag TINTF indicating the timer interrupt
Is set, the microcomputer μC2 in the lens proceeds from # L45 to # L50 in FIG. 32 to reset the flag TINTF. Then, it is determined whether or not the mode I is a zoom lens retraction based on data input from the body or data set in the reset mode (# L55).
In # L55, when it is determined that the renormalization zoom lens mode I (when OFF the main switch S _M of the body), the process proceeds to # L90, and then returns resets the flag ZIF indicating that the renormalization zoom lens. On the other hand, if the zoom lens is not in the mode I, the drive speed of the zoom motor M3 is set to the highest speed V3, and the control focal length is
fc = 80 mm, the drive I is controlled, and it is waited that the flag ZMVF indicating that the zoom drive is being performed is reset (# L60 to # L8
0). If the focal length of the lens reaches the control focal length fc (80 mm) and the flag ZMVF is reset in # L80, the flag ZIF indicating that zooming is being performed is reset in # L90 and the process returns.

Referring back to FIG. 31, when the retraction of the zoom lens as described above is completed, a display routine for displaying lens information is executed, the timer T for holding power is reset and started, and 10 seconds elapse. Wait, after 10 seconds,
The display is deleted and stopped (# L20 to # L24).

Next, the display routine will be described. Before that,
The display patterns will be described with reference to FIGS. 58 (a) to 58 (e).
FIG. 58 (a) shows all display patterns. The character “MACRO” is displayed to notify the photographer that the photographing magnification is (1/10) or more when the photographing magnification is the macro photographing area. The bar display below that indicates the range of the distance from the shortest shooting distance to the subject at each focal length. In the figure, the left end of the bar indicates the shortest shooting distance, and the right end of the bar indicates the distance to the subject. The number string described in two columns below the bar display is
The distance [m] indicated by the bar is shown. When one of the upper row and the lower row is selected, all the numeric strings in the one row are displayed, and the other is erased. The bar display can be discretely displayed for each scale on which a numeric string is displayed. The display example is shown in Fig. 58 (b)
To (e). For example, if the focal length is 28 mm and the distance is 2 m, the shortest photographing distance is 0.3 m, and the upper row (0.3 m to ∞) is used as a numeric string indicating the distance range, and the bar display is 0.3 m.
To 2 m (see FIG. 58 (b)). At a focal length of 50 mm and a distance of 2 m, the shortest photographing distance is 0.5 m, and the upper row (0.3 m to ∞) is used as a numeric string indicating the distance range, and the bar display shows 0.5 m to 2 m (No. (See FIG. 58 (c)). The upper numeral sequence and the lower numeral sequence are switched at a focal length of 80 mm. If the focal length is 100 mm and the distance is 2 m, the shortest shooting distance is 0.8 m, and the lower row (0.6 m to ∞) is used as a numeric string indicating the distance range, and the bar display is
The range from 0.8m to 2m is displayed (see Fig. 58 (d)). With a focal length of 200mm and a distance of 2m, the shortest shooting distance is 1m,
The lower row (0.6 m to ∞) is used as a numeric string indicating the distance range, and the bar display indicates 1 m to 2 m (see FIG. 58 (e)).

The lower left three-digit numerical display portion of the display pattern indicates the current focal length [mm], and the left and right marks indicate the direction in which the focal length changes. The mark on the left is displayed when zooming in the wide direction. The mark on the right is displayed during zooming in the telephoto direction.

In addition, “OFF”, “RST”, Is displayed when each mode is selected. Also, When the AZP2 mode based on the image magnification between the two points is selected, if one point is stored, the upper point is Once stored, both points are displayed.

FIG. 36 shows a display subroutine for controlling the above display patterns. When this subroutine is called,
Data of the current focal length range from the zoom encoder ZMEN
read the f _1. Further, it reads the count value Zc of the zoom counter ZC that counts the pulses from the encoder ENC3. Then, an accurate focal length f is obtained from the data f ₁ and Zc, and the focal length f is first displayed (# L250 to # L26).
0).

FIG. 37 shows a subroutine for obtaining the focal length f from the data f ₁ and Zc. When this subroutine is called, first, it is determined whether or not a flag WDF indicating zooming of the zoom lens in the wide direction is set (# L37).
Five). If the flag WDF is set at # L375,
As zoomed to the wide side, reads the longest focal length f _B at the focal length range f ₁ from the ROM table, and the longest focal length f _B, of the zoom counter ZC showing the zooming amount in the focal length range f ₁ The correct focal length f is read from the count value Zc based on the ROM table, and the process returns (# L380, # L385). On the other hand, if the flag WDF is not set, it is determined that the zoom has been made to the telephoto side, and the shortest focal length f _A in the focal length range f ₁ is read from the ROM table, and the shortest focal length f _A and the focal length range f Count value of the zoom counter ZC indicating the zooming amount in ₁
The correct focal length f is read from Zc based on the ROM table, and the process returns (# L390, # L395). The relationship between the focal length range f ₁ and the shortest focal length f _A and the longest focal length f _B are as shown in Table 1.

Returning to the flow of FIG. 36, in # L262, it is determined whether or not the obtained focal length f is 80 mm or more.
The upper numeral string (0.3 m to ∞) is selected from the upper and lower numeral strings indicating the distance range, and if f> 80 mm, the lower numeral string (0.6 m to ∞) is selected. Next, the distance Dv is calculated and displayed from the focal length f and the feeding amount N input from the camera (# L270). In addition, regarding the calculation method of the distance Dv,
For example, it is disclosed in Japanese Patent Application No. 63-28512. And
Judges the zoom mode, displays the character “OFF” in the OFF mode, displays the character “AZP1” in the AZP1 mode.
In the ZP2 mode, the characters "AZP2" are displayed, and in the reset mode, the characters "RST" are displayed (# L280 to # L280).
L295). If the mode is AZP1 mode, the warning data
It is determined whether or not WNG is set, and if it is set, the character “AZP1” is displayed blinking (# L287, # L28
8).

Next, in # L300, it is determined whether or not the mode is the AZP2 mode.
If it is the mode, the process proceeds to # L305, and it is determined whether or not the flag SC1F indicating that the first setting has been completed is set. In # L305, if the flag SC1F has been set, perform the display of the willing "AZP2 ^0" in # L310, flag
If SC1F is not set, proceed to # L315
It is determined whether the flag SCF indicating that the first setting has been completed is set. In # L315, if the flag SCF has been set, performs a display of "AZP _{⁰ 0"} in # L320, in the case where both flags SC1F, SCF has not been set together is, of "AZP2" in # L325 Display only characters. # L310
Alternatively, from # L320 or # L325, proceed to # L331, and # L3
When it is determined that the mode is not the AZP2 mode in 00, the process also proceeds to # L331, the encoder ZVEN indicating the speed and direction of zooming is read, and the zoom switch (abbreviated as "ZSW" in the figure) for zoom drive is turned on. Judge whether or not
If not, the process proceeds to # L350, only the focal length is displayed, and the process proceeds to # L355 (# L331, # L332). When the zoom switch is ON, the zoom direction is determined. When the zoom is in the telephoto direction, an arrow pointing right in the figure is displayed. When the zoom is in the wide direction, an arrow pointing left in the figure is displayed. # L335 to # 345). In # L355, a photographing magnification β is calculated from the focal length f and the photographing distance Dv. Then, the photographing magnification beta is equal to or a predetermined value β _{K (=} 1/10) or more, equal to or greater than a predetermined value β _K, "MACRO" to display, if it is less than the predetermined value beta _K The “MACRO” display is deleted, and the routine returns (# L360 to # L370).

Next, when the microcomputer μC1 in the body is stopped and the microcomputer μC2 in the lens is stopped, or when the old body (conventional body) is used and the microcomputer μC2 in the lens is stopped, the operation is performed. When the operation of the ring 80 is performed, an F / ZINT interrupt routine (FIG. 38) for performing the power zoom PZ is executed. When this F / ZINT interrupt occurs, the microcomputer μC2 in the lens first sets the terminal CSLE to the “Low” level for a moment, and performs an interrupt to the body (# L400).
The shift amount Δf (described later) in the AZP2 mode is set to 0.
And then, the timer T _A reset, and start, Tataima
T _A waits for the measuring the time _{t 1 (# L405~ # L415)} . Here, perform waiting time t ₁ by the timer T _A, the lens is to determine whether the old type with body side. If the lens is not the old type, after the interrupt to the above body, the body sets the terminal CSLE to “Low” level in order to update the data, and the lens responds to this by executing the CS interrupt described later. We, executes another flow before the timer T _a finishes counting the time t _1. However, if the main switch S _M of the body side is OFF, the data communication is not performed. Therefore, # L400 CS interrupt is not performed even if the terminal CSLE instantly "Low" level, finishes counting the timer T at _A time t _1. If the timer T _A at # 415 Oere measures the time t _1, the timer T _A stop, interrupt by the operation of the operation ring 80 F /
Permit ZINT and stop (# L417 to # L420).

Next, when a signal that changes from “High” level to “Low” level is transmitted from the body to the lens terminal CSLE, the microcomputer μC2 in the lens executes a CS interrupt routine shown in FIG. In this routine, first, the F / ZINT interrupt by the operation of the operation ring 80 is prohibited, and it is determined whether or not the flag RUSF indicating that the release is being performed is set (# L55).
0, # L555). When the flag RLSF is not set, that is, when the shutter is not being released, 2-byte serial communication is performed in response to the clock from the camera (# L56
0). From this data, it is determined whether or not the body is the old body. If the body is the old body, serial communication of 6 bytes is performed, lens data is sent to the body, and the signal to the terminal CSLE is set to the “High” level. Wait, and when it becomes “High” level, enable the interrupt F / ZINT and return (# L565 ~
# L580). In # L565, if it is not the old body, data indicating the communication mode and the repetition mode is subsequently input from the body by one-byte serial communication, and the communication mode is determined (# L585, # L590).

In the communication mode I, it waits for the signal to the terminal CSLE to change from the “Low” level to the “High” level, and when the signal goes to the “High” level, executes the zoom lens subroutine subroutine. In this case, since the renormalization mode is set to mode II, move the zoom lens to a position where a predetermined shooting magnification can be obtained, and after reaching the position, temporarily connect the terminal CSLE to indicate that zooming has been completed. As the “Low” level, proceed to the PZ subroutine (# L610) (# L5
95 to # L605). # L6 after executing PZ subroutine
Execute the subroutine shown in step 12, subroutine of PZ,
Repeat the display subroutine. And this display is
Body side microcomputer μC1 to stop power supply to the lens circuit LE _CT (main switch S _M is OFF or photographing preparation switch S1 is turned OFF or 5 seconds) is continued until.

Here, the PZ subroutine (# L610) is shown in FIG. When the subroutine is called, first, the microcomputer μC2 in the lens determines whether or not the flag MD3F indicating that the mode III data communication has been completed is set (# L702), and the flag MD3F is set. If not, return and prohibit mode setting. When the flag MD3F is set, the process proceeds to # L705. The processing after # L705 will be described later.

Returning to the flow of FIG. 41, when the communication mode is determined in # L590, if the data communication is mode II, 12-byte data is output to the body side, and the terminal CSLE is changed from the “Low” level to the “High” level. Changes are detected and the terminal CSLE
Goes to the "High" level, the flow proceeds to the PZ subroutine (# L620, # L625).

In the case of mode III data communication, 3-byte data is input from the body side, and the terminal CSLE waits for a change from the “Low” level to the “High” level.
When the level reaches the "igh" level, the flag MD3F indicating the end of mode III data communication is set, and the flow proceeds to the subroutine of PZ (# L630 to # L637).

Returning to FIG. 42, the processing after # L705 in the PZ subroutine will be described. As mentioned above, Mode III
Is performed even once, the flag MD3F is set, and the process proceeds from # L702 to # L705. In # L705, it is determined whether zoom driving is possible based on input data from the camera. If zoom driving is not possible, the process returns immediately. #
In L705, if zoom drive is possible, focal length range
f ₁ and obtains the count value Zc from the focal length f of the zoom counter ZC, transferred the focal length fx obtained last time in fy, the focal length f obtained above and fx, the process proceeds to # L717 (# L710~ # L714) .
In # L717, it is determined whether or not a reset mode (abbreviated as "RST" in the figure) is present. If the mode is the reset mode, the subroutine of the reset mode is executed in # L718 and the process returns.
If it is not the reset mode at # L717, it is determined at # 720 whether or not the AZP2 mode is set.
Execute the subroutine and return. #AZ with L720
If the mode is not the P2 mode, it is determined whether or not the mode is the AZP1 mode in # 725. If the mode is the AZP1 mode, the subroutine of the AZP1 is executed in # L727 and the process returns. If the mode is not the AZP1 mode in # L725, that is, if the mode is the OFF mode, the # L730 manual zoom (abbreviated as "MZ" in the figure) subroutine is executed and the routine returns.

Hereinafter, each of the above subroutines RST, AZP2, AZP1, MZ will be described. First, if it is determined in # L717 that the current mode is the reset mode, a reset mode subroutine shown in FIG. 44 is executed. When the subroutine is called, it is determined whether or not the lens switch S _Q is ON, if it is ON, the memory switch S _R which is operated to store the current state is ON It is determined whether or not there is (# L900, # L905). If the memory switch S _R is ON, the process proceeds to # L907, based on the data inputted from the body, it determines whether or not the focus. #
If the focus is not achieved in L907, the routine returns. If the focus is achieved, the flag ZMRS indicating that the state storage in the reset mode is completed.
Set F (# L910). And the lens switch S _Q
Is determined whether or not the flag SQONF indicating that has been turned ON once is set. If the flag SQONF is set, it is determined that the flag has already been set and the process returns (# L915). If the flag SQONF is not set, this flag SQO
Set the NF, stores the focal length f obtained above as a zoom reset value f _ZR, the process returns (# L920, # L935).

On the other hand, if the memory switch S _R is OFF in # L905, when # proceeds to L940, the flag indicates that the set of the reset mode has ended ZMRSF it is determined whether it is set, is set , Resets the flag SQONF and returns (# L940, # L945). Also,
In # L900, when the lens switch S _Q is not ON, # proceeds to L955, determines whether the memory switch S _R is ON, the memory switch S _R is not ON (Nothing is operated If not, return. When memory switch S _R is ON, # proceeds to L960, the flag indicating that the lens switch S _Q is ON SQON
Determine whether F is set. When the flag SQONF is set, after completing the set in the reset mode, it is determined that the lens switch S _Q is OFF, the flow returns. In # L960, when the flag SQONF is not set, it is determined that the memory switch S _R is turned ON to reset the set value in the reset mode resets the flags ZMRSF indicating a setting completion of the reset mode, the return Yes (# L96
Five).

In the flow of FIG. 42, if it is not the reset mode in # L717, it is determined whether or not the AZP2 mode is in # 720. If it is in the AZP2 mode, the subroutine of AZP2 is executed in # L722. This subroutine is shown in FIG. When the subroutine is called, first, it is determined whether the focus, if not focus is to return, if focus, determines whether the memory switch S _R is ON ( # L1000, #
L1002). If the memory switch S _R is not ON, the process proceeds to # L1005, determines whether the flag AZP2F is set. This flag AZP2F is a flag indicating that the setting in the AZP2 mode has been completed and the control in the AZP2 mode can be performed. When the flag AZP2F is set in # L1005, the three flags SCF, SC1F and SQONF are reset (# L1020 to # L1030). Then, the process proceeds to # L1035, where the control focal length fc is calculated from the feeding amount N by the following equation.

In the above equation, f _II1 is the focal length of the first point set in the AZP2 mode, and f _II2 is the focal length of the second point set in the AZP2 mode. Also, D ₁ is the distance first point which is set in AZP2 mode, D ₂ is the distance second point which is set in AZP2 mode. Next, in order to drive the zoom lens, a subroutine of drive I is executed in # L1040, and the process returns.

Here, the drive I subroutine will be described with reference to FIG. When the subroutine is called, first, determined as a movement amount from the infinity position deviation amount M _F focus to the focal length fc determined (infinite focus is the far point lens position) (# L485).

The following describes how to determine the focus shift amount M _F.

FIG. 57 is a graph in which the horizontal axis represents the focal length f and the vertical axis represents the amount of extension. With this lens, a certain distance (for example,
The ratio between the lens extension of 2m) and the lens extension of the detection distance (D [m]) is set to be constant regardless of the focal length. Then, the data of the extension amount of the specific distance for each focal length is stored in a memory (ROM) in the microcomputer μC2 in the lens. Now, setting the specific distance to 2 [m], after focusing on the subject of D [m] at a focal length f _3, consider a case where the zooming to the focal length f _4. The feeding amount N3 with respect to the distance 2 [m] at a focal length f _3, a focal length extension amount of the N _F to the distance D [m] at f _3, a feeding amount for the distance 2 [m] at a focal length f ₄ when the N4, feed amount N _Z with respect to the distance D [m] of the focal length f ₄ can be approximated as _{N F / N3 = N Z /} N4, N Z = N
_F (N4 / N3). Accordingly, the correction amount N2 of feeding amount caused by zooming from the focal length f ₃ to the focal length f ₄ is, N2
= Is determined as _{N Z -N F = (N4 /} N3-1) N F.

In the above concept, 2 [m] is selected as the specific distance. However, if the lens extension includes an error or the distance away from 2 [m], the distance is not always exactly proportional. Includes some errors. This is often the case when the focal length is long and the subject distance is short. Therefore, in order to reduce this error, the specific distance is set to 1 [m], 2 [m].
[M] and 5 [m] are provided.

FIG. 43 shows a flowchart of the microcomputer μC2 in the lens for performing this control. First, the current focal length fx
The distance Dx is obtained from the lens extension amount N from the infinity position input from the camera body, and when the distance Dx is 1.4 [m] or less, the current focal length fx and the previous focus from the line of the specific distance 1 [m] are obtained. Extending distance fy from infinity
Move to # L870 for Nx and Ny (# L850 to # L85
6). This is a specific distance 1 with fx, fy as the address.
What is necessary is just to read out the ROM table that stores the feeding amounts Nx and Ny in [m]. Distance Dx is greater than 1.4 [m] 4
When the distance Dx is larger than 4 [m], when the distance Dx is larger than 4 [m],
The feeding amounts Nx and Ny at a specific distance of 5 [m] are obtained in the same manner as described above, and the process proceeds to # L870 (# L860 to # L8).
68). Then, the feeding amount M _F at the time of correction in # L870 M _F =
(Nx / Ny) xN and return.

Returning to the flow 39 diagram when finishes the subroutine of M _F calculated in # L480, compares the control focal length fc and the current focal length f which is set by the reset routine, fc =
If f, it is determined whether or not the flag ZMVF indicating that the lens is being driven is set. If the flag ZMVF is not set, the process returns. If the flag ZMVF is set, the subroutine for stopping the zoom lens is executed, and the routine returns (# L480 to # L500). # L490 on f ≠
If it is fc, the process proceeds to # L492, and it is determined whether or not f> fc.
> Fc, # L5 to drive the lens to the wide side
Proceed to 20 and, if f> fc, proceed to # L530 to drive the lens to the telephoto side. Subsequent operations will be described later.

Here, in the counter interrupt routine (FIG. 33),
When the flag ZIF is not set (ZIF = # L110
Operation 0) will be described. First, it is determined at # L115 whether or not the mode is the OFF mode. # When not in OFF mode in L115, zoom encoder reads the focal length range f ₁ from the zoom encoder ZMEN, corresponding to the control focal length fc calculated in operation
Determines whether equal to the value fc ₁ of ZMEN (# L140, # L14
Five). If f ≠ fc ₁ in # L145, to return. # L145
If f ₁ = fc _1, it is determined once whether or not the flag fc ₁ F indicating that the vehicle has passed through is set, and if it is set, one count value Zn indicating the driving amount is set to one. The countdown is performed, the drive speed V is reduced to V1, and the process proceeds to # L154 (# L150 to # L152). # If the flag fc ₁ F is not set in L150, it sets a flag fc ₁ F in # L153,
Go to # L154. In # L154, the count value Zn indicating the drive amount
Is determined to be 0 or not. If Zn = 0 in # L154, the lens stop subroutine is executed, the flag fc ₁ F indicating that this flow has been passed is reset, and the routine returns (#
L155, # 156). If Zn = 0 in # L154, return immediately.

Returning to the flow of FIG. 45, when the flag AZP2F indicating that the control of the AZP2 mode is possible is not set in # L1005, it is determined by the flag SCF whether or not the storage of two points is completed, and the storage of the two points is performed. There when it has been completed (SCF = 1), it is determined that the memory switch S _R storage is completed is turned OFF, and sets a flag AZP2F showing control Friendly AZP2 mode control is returned (# L1010, # L1015 ). In addition,
The data of this flag is output to the camera as data indicating the presence / absence of the AZP2 mode set. When # L1010 flag SCF is not set, i.e., when the storage of the two points is not completed, in order to release or reset the memory, as was operated memory switch S _R or, flag SC1F, the SQONF Each is reset and returns (# L1012, # L1013).

On the other hand, in # L1002, when memory switch S _R is ON, and resets the flag AZP2F showing control Friendly AZP2 mode, lens switch S _Q determines whether it is ON (# L1045, # L1050) . When the lens switch S _Q is ON, at # L1055, flag SCF indicating a setting completion of the two points to determine whether it is set, when the flag SCF is set, the routine returns. # L10
If the flag SCF is not set at 55, it is determined whether or not the flag SC1F indicating that the storage of the first point is completed is set. When the flag SC1F is set, it is determined whether the flag SQONF is set to indicate that the lens switch S _Q is ON. When the flag SQONF is set, the lens switch S _Q after the second point is set continues to be ON, the return without performing any (# L1060, # L1065). # L1065
In, when the flag SQONF is not set, because the lens switch S _Q to set the second point is the was turned ON, the flow advances to # L1070 subsequent steps, 2
Remember the score. First, the flag SCF is set, and the focal length f is set to a second set value f _II2 . Then, the feed amount N _F of AF lens read from the body, seeking distance D from the focal length f, the distance D between the second set value D _2.
Thereafter, the flag SQON indicating that resets the flag SC1F indicating the storage completion of the first point, the lens switch S _Q is ON
Set F and return (# L1070 to # L1100).
Note that the seek distance D from the focal length f and the feed amount N _F, may be calculated each time, the ROM table for reading the distance D to the combination of the focal length f and the feed amount N _F as an address May be used. In # L1060, 1
If the flag SC1F indicating that the storage of the first point has been completed is not set, the switch S _{Q is} used to store the first point.
Indicates that has been turned on. At this time, # advances to L1105, flag SQONF indicating that the lens switch S _Q is ON, it is determined whether it is set, the set when no lens switch S _Q and is turned ON for the first time this flow And the process proceeds to # L1120. The focal length f is set to a first set value f _II1 . Then, from a feed amount N _F and the focal length f of the AF lens read from the body, the distance D
Look, the distance D to the first set value D _1, the process returns. In # L1105, when the flag SQONF is set, after completion of setting the first point also lens switch S _Q is
Since it is kept ON, it returns immediately. # L105
At 0, when the lens switch S _Q is not ON, the process proceeds to # L1127, determines whether the flag SQONF is set. When the flag SQONF is set, the lens switch S is set after the flag SQONF is set.
_When it is determined that _Q has been turned off, the process proceeds to # L1130, and it is determined whether the flag SCF indicating the completion of setting of two points has been set. If the flag SCF is not set in # L1130, the setting of the first point has been completed, so the flag SC1F is set in # 1135, and the process proceeds to # L1140. # Flag SC at L1130
When F is set, skip # L1135 and #
Proceed to L1140. In # L1140, the flag SQONF is reset and the process returns. When the # L1127 in the flag SQONF has not been set, since the OFF state of the lens switch input S _Q is followed, to return without doing anything.

In the flow of FIG. 42, if the mode is not AZP2 in # L720, it is determined whether or not the mode is AZP1 in # 725. If the mode is AZP1, the subroutine of AZP1 is executed in # L727. This subroutine is shown in FIG. When this subroutine is called, first, it is determined whether or not the subject is in focus, and if not, the process returns immediately. If the camera is in focus, it performs the process of shifting the shooting magnification when the zoom operation is performed,
Then, a control focal length fc and a feed amount N _F and the focal length f of the AF lens, in order to drive the zoom lens, by executing the subroutine of the drive I, the process returns (# L120
0 to # L1210).

Here, FIG. 48 shows a subroutine of the above-mentioned shift. When this subroutine is called, data from the encoder ZVEN indicating whether or not a zoom operation has been performed is read, and it is determined whether or not an operation has been performed. If the operation has not been performed, the process returns (# L1220, # L1220). L1225). When the zoom operation is performed, the operation direction is determined. When the operation is performed in the tele direction, the predetermined amount Δf ₁ is added to the change amount Δf. When the operation is performed in the wide direction, the predetermined amount Δf ₁ is calculated. Subtract from the change amount Δf and return (# L1230 to # L12
40). Here, only the operation direction is considered, and the operation angle of the operation ring 80 is not considered.

Next, a subroutine for obtaining the control focal length fc and a feed amount N _F and the focal length f of the AF lens 46 FIG. When this subroutine is called, first, the focal length f and AF
Seek distance D from the feed amount N _F of the lens, the focal length fa in accordance with the distance D fa = a × D + b (a, b are constants) obtained by (# L1155, # L1156). That is, the shooting magnification is determined according to the distance D. Next, data from the encoder ZVEN indicating whether or not a zoom operation has been performed is read in # 1157, and it is determined whether or not a zoom operation has been performed in # 1160. #
If it is determined in 1160 that an operation has been performed, the control focal length is set to fc = fa + Δf, and if it is determined that there is no operation, the control focal length is set to fc = fa, and the process proceeds to # L1165 (# L1162, # L1163). Then, based on the distance D, a possible maximum focal length fmax and a minimum focal length fmin are obtained, and it is determined whether the control focal length fc is larger than the maximum focal length fmax or smaller than the minimum focal length fmin, and fc> fmax
If fc = fmin, fc = fmin if fc <fmin, the warning flag WNG is set and the process returns (# L1165 to # L1195). Also, the control focal length fc is fmin
If ≤ fc ≤ fmax, the warning flag WNG is reset and the routine returns (# L1197).

In the flow of FIG. 42, if it is not the AZP1 mode in # L725, it is determined that the mode is the OFF mode (manual zoom mode), and a manual zoom (abbreviated as "MZ" in the figure) subroutine is executed in # L730. This subroutine is called
See Figure 49. When this subroutine is called,
At # L1250, an encoder ZVEN indicating whether or not a zoom operation has been performed is read, and at # L1255, it is determined whether or not an operation has been performed. If it is determined in # L1255 that an operation has been performed, a subroutine of drive II is executed to drive the zoom lens, and the process returns (# L1260).

Here, the subroutine of drive II is shown in FIG. When this subroutine is called, first, as the motor stops at the counter interrupt is not performed, it is set to a large value FF _H that can not take a driving amount Zn of the zoom lens corresponding to the count value Zc of the zoom counter ZC Then, among the data read from the encoder ZVEN, the zooming speed signal is output to the motor drive circuit MD3 (# L505, # L510). Next, among the data read from the encoder ZVEN, it is determined whether or not the driving direction is the retraction direction based on the data indicating the driving direction. If the driving direction is the retraction direction, Δf is subtracted from fy as the target focal length. And the amount of movement that is shifted by zooming
Computing the _{M F (# L505~ # L518)} . Then, it outputs a renormalization signal to the motor drive circuit MD3 and sets a flag WDF indicating zooming in the wide direction (# L515-
# L525). Then, sets the flag ZMVF indicating that the zoom lens is moving, and calculates a focal length range fc ₁ and the driving amount Zn corresponding to the control focal length fc, the process returns (# L540~ # L542).

Here, the reason for performing the predictive control by determining the target focal length is as follows.
This is because it is desired to accurately correct the focus shift caused by the zoom. With manual zoom, you don't know when to stop,
If the amount of focus shift is corrected with respect to the focal length at that time, when the zoom is stopped, the camera cannot immediately know the focal length at that time, and the correction of the shift amount may be excessive or insufficient. In addition, even if the amount of focus shift (correction amount) detected during zooming is known, the focal length of the lens is different when the correction is performed for the follow-up correction. The image seen through the viewfinder will be out of focus. However, as in the present embodiment, if the focal length when the zoom is stopped is predetermined, the correction of the shift amount is not excessive or insufficient,
In addition, since it does not become the follow-up correction, there is no disadvantage as described above.

If direction renormalization driving direction # L515, a Δf as the target focal length is added to fy, calculates the movement amount M _F deviate by zooming (# L527, # L528). Then, it outputs a feed signal to the motor drive circuit MD3, resets the flag WDF indicating that the zoom is in the wide direction, and proceeds to # L540 (# L530, # L535).

Here, the focal length range fc ₁ corresponding to the control focal length fc
FIG. 40 shows a subroutine for calculating the driving amount Zn. When this subroutine is called, first, it is determined whether or not a flag WDF indicating zooming in the wide direction is set (# L543). This and zooming to a wide direction, at the time of zooming to the telephoto direction, even for the same control focal length fc, the count value Zc of the focal length range f ₁ and the zoom counter ZC zoom encoder ZMEN is because different It is. For example, when zooming in the wide direction, a focal length range fc ₁ larger than the control focal length fc and a negative drive amount Zn are obtained. On the other hand, when zooming in the tele direction, a focal length range fc ₁ smaller than the control focal length fc is obtained. It is necessary to obtain the positive drive amount Zn. Therefore, when convolving the zoom lens to the wide direction (WDF = 1) reads a focal length range fc ₁ and the driving amount of Zn from the first ROM table control focal length fc as addresses (# L545). When feeding the zoom lens to the telephoto direction (WDF = 0), the control focal length fc from the second ROM table as an address to the focal length range fc ₁ reads the driving amount Zn (# L544). Then, the process proceeds from # L544 or # L545 to # L546, sets sleep prohibition data, and returns.

In the counter interrupts the OFF mode (manual zoom mode), is determined to be the OFF mode # L115 of Fig. 33, the process proceeds to # L120, reads the focal length range f ₁ from the zoom encoder ZMEN. Then, the focal length range f ₁ read, is not identical to the previous value Lf _1, that is, whether the changed focal length range (# L12
Five). If the focal length range is changed, and resets the count value Zc of the zoom counter ZC showing the feeding amount, and stores the focal length range f ₁ of the current as the previous value Lf _1, the process returns (# L130, # L135). This makes it possible to accurately detect the feeding amount after the focal length range is changed.
If the focal length range has not changed in # L125, # L1
Skip 30 and proceed to # L135.

As described above, the zoom lens is driven in the zoom direction and speed according to the operated direction and amount.

In the flow of FIG. 49, when it is determined that there is no operation in # L1255, the process proceeds to # L1265, it is determined whether or not the flag ZMVF indicating that the zoom drive is being performed is set, and the flag ZMVF is set. Then, the focal length f is obtained from the data f ₁ and Zc read from the encoder, and the lens is driven until the focal length f reaches the target focal length fy.
If fy, the zoom lens stop subroutine is executed in # L1275, and the process proceeds to # L1276. If the flag ZMVF is not set in # 1265, # L1275 is skipped and # L1275 is skipped.
Continue to 1276. In # L1276, determines whether the lens switch S _Q is ON, unless the lens switch S _Q is ON, the routine returns. # L1276 with lens switch S _Q
If the flag ZMRSF is ON, it is determined whether or not the flag ZMRSF indicating the completion of the setting of the focal length in the reset mode is set. If the flag ZMRSF is not set, the process returns. If the flag ZMRSF is set in # 1277, the focal length f _ZR set in the reset mode
Is the control focal length fc, and in order to drive the zoom lens,
Execute the drive I subroutine and return (# L1
278, # L1279).

Returning to the flow of FIG. 41, when it is determined in the communication mode # L590 that the data communication is in the mode IV during release, the variable N is set to 0 and the flag RL indicating that release is in progress is set.
Set SF and return (# L640, # L645).

Next, when a pulse is input from the body during release (during exposure), the process proceeds from # L555 to # L665, where N = N +
In step # L670, it is determined whether the value of N is 1.
In # L670, if N = 1, the driving focal length fc is set to a large value that cannot be obtained, and the driving I
Execute the subroutine and return (# L675, # L67
7). If N ≠ 1 in # L670, the zoom lens stop subroutine is executed, the flag RLSF indicating that the shutter is released is reset, and the routine returns (# L680, # L685).

Next, in the determination of the communication mode of # L590, the mode V
(As described above, at this time, the camera body is about to enter the sleep mode), and outputs 1-byte data including a sleep enable / disable signal, and the terminal CSLE is set to “High”. Wait for the level,
If the level becomes “High”, proceed to # L655 (# L650, # L65
2). In # L655, it is determined whether or not the sleep enable signal is set. If the signal is not set, the process returns immediately. If the signal is set, the display is erased and the F /
The ZINT interrupt is permitted, the flag MD3F indicating that data communication in mode III has been performed is reset, and the process returns (# L660 to # L664).

Next, the control operation of the microcomputer μC3 in the card will be described. When the card is inserted into the body, switch S _RE3
The signal changes from the “Low” level to the “High” level to the reset terminal RE3 of the microcomputer μC3 in the card, and the microcomputer μC3 in the card executes a reset routine shown in FIG. Here, the port and the register are reset, and a sleep state is set (# C5). And the terminal
When a “Low” level signal indicating a data communication request from the microcomputer μC1 in the body is input to the CSCD, the microcomputer μC3 in the card executes an interrupt routine shown in FIG. First,
Performs 1-byte serial communication, determines the communication mode,
Steps are performed from # C20 for mode I communications, from # C40 for mode II communications, from # C55 for mode III communications, and from # C70 for mode IV communications ( # C10, # C15, # C35, # C50).

Hereinafter, the operation in each communication mode will be described. If the communication is in mode I, set to data input mode and
1-byte data is input from the microcomputer μC1 in the body by serial communication of bytes, and a mode determination subroutine is executed to enter a sleep state (# C20 to # C30).

FIG. 52 shows this mode determination subroutine. When the subroutine is called, on the basis of data input from the body, determines whether or not the card switch S _CD is turned ON, the process returns if not ON (# C8
0). If the card switch S _CD is turned ON, it is determined whether the flag SCDF showing the card control is set (# C85). In # C85, if the flag SCDF is set, it means that it was a card control before that.
The flag SCDF is reset to reset the card mode, the card mode data output to the body is reset, and the process returns (# C90, # C95). In # C85,
If no flag SCDF is set, since the card switch S _CD is operated to the state of the card control, and sets a flag SCDF, and then returns the set data of the card mode to output to the body side (# C100 , # C10
Five).

Returning to the flow of FIG. 51, in the case of communication in mode II, the mode is set to the data output mode, 1-byte data is output to the microcomputer μC1 in the body by 1-byte serial communication, and the device enters the sleep state (# C40, # C45). The 1-byte data includes card mode data.

In the case of mode III communication, the mode is set to the data input mode, 7-byte data is input from the microcomputer μC1 in the body by 7-byte serial communication, and an arithmetic routine is executed based on this data to enter a sleep state. (# C55
~ # C65).

This calculation routine is shown in FIG. In this routine,
First, the release lock flag RLKF is reset, and the exposure value EV is set to EV = BVo + A based on the data input from the body.
Calculate with Vo + SV. And this exposure value EV is the maximum aperture value
It is determined whether or not the exposure value (AVmax + 5) when the shutter speed is (1/30) seconds at AVmax (# C11)
0 to # C125). This is because (1/30) seconds is assumed as the fastest shutter speed at which the effect of the zoom during exposure can be obtained when driving the zoom lens. When the exposure value EV is larger than (AVmax + 5), it is determined that there is no effect even if the zooming during exposure is not performed, the process proceeds to # C165, the release lock flag RLKF is set, and the process returns. If the exposure value EV is equal to or smaller than (AVmax + 5), it is next determined whether or not the exposure value EV is smaller than the exposure value (AVo + 1) when the shutter speed is 1 second with the open aperture value AVo (# C13).
0). This is because the camera shake increases when the shutter speed is slower than 1 second when performing the inter-exposure zoom. If the exposure value EV is less than (AVo + 1), the release lock flag RLKF is also set. And return. If the exposure value EV is (AVo + 1) or more, the maximum aperture value A
An aperture difference ΔAV between Vmax and the open aperture value AVo is calculated, and the aperture value AV is calculated according to the following equation (# C135, # C140).

As shown in FIG. 54, the AE program diagram is a line connecting an intersection between the open aperture value AVo and the shutter speed TV = 1 and an intersection between the maximum aperture value AVmax and the shutter speed TV = 5. . Then, the shutter speed TV is calculated by TV = EV−AV (# C145). Then, it calculates the ratio f _R = fmax / fp of the current focal length fp and the maximum focal length fmax, if f _R> 1.5, the routine returns as the effect of exposure zooming (#
C150, # C155). If f _R ≦ 1.5, it is determined that there is no effect of the during-exposure zoom, the release lock flag RLKF is set, and the routine returns.

Returning to the flow of FIG. 51, if the communication is in the mode IV, the mode is set to the data output mode, 3-byte data is output to the microcomputer μC1 in the body by the 3-byte serial communication, and the sleep state is set (# C70, # C75).

Finally, the flags and variables used in the above embodiment are summarized in Tables 2 and 3.

Modification Example 1 In the above-described embodiment, even when focus detection becomes impossible during power zooming or when focus detection becomes impossible when a zoom operation is performed, zooming is performed by reflecting the photographer's intention. Although priority is given, in the following embodiments, focus is given priority. That is, when focus detection becomes impossible, the zoom operation is stopped until focus detection becomes possible,
After focus detection becomes possible, re-zoom is performed if a zoom operation is performed.

First, only the changed part of the AF subroutine shown in FIG. 23 will be described with reference to FIG. In the figure, the same steps are denoted by the same step numbers. If the focus cannot be detected in step # 1106, the process proceeds to step # 1131, and zoom inhibition data is set. Then, a subroutine of lens communication III is executed at # 1132 to stop zooming, and a subroutine of low contrast scan is executed at # 1133, and the routine returns. In step # 1106, if the focus can be detected, the defocus amount DF is calculated, the lens driving amount N1 is calculated, and the flag LSF indicating the low contrast scan is reset (# 1107 to # 1110). Then, the zoom permission data is set, the subroutine of lens communication III is executed, and the flow proceeds to # 1125 (# 1121, # 112).
2). Further, in # 1101, when the low contrast scanning inhibition flag LSINF is set, similarly to the flow of FIG. 23, the correction amount N2 by the zoom and calculates a N2 = M _F -N _F, the lens driving amount N = N2 (# 1116, # 111
8). Then, the zoom permission data is set, the subroutine of lens communication III is executed, the zoom drive is started, and the flow shifts to # 1185.

The lens control subroutine of FIG. 14 is changed as shown in FIG. Here, the same steps are denoted by the same step numbers. In the flow of Fig. 68, # 730
After setting the zoom prohibition data with, execute the lens communication III subroutine to prohibit zooming, and
Proceed to. In addition, the process proceeds from # 736, # 738, and # 740 to # 810.
This is # 540 after the lens control subroutine of # 515
This is because the subroutine of lens communication III is executed after the permission / prohibition of zoom is set in accordance with the result of focus detection in the AF subroutine executed in step (1).

Furthermore, on the lens side, the power zoom (PZ) shown in Fig. 42
Is changed as shown in FIG. 69. Here, the same steps are denoted by the same step numbers. Explaining only the changes, lens communication from camera at # L705
After inputting the data of III, if the data of the zoom inhibition is set in this data, it is determined whether or not the flag ZMVF indicating that the zoom is being driven is set in # L706,
If it is set, the zoom lens stop subroutine is executed in # L707 and the process returns. If it is not set, the process directly returns.

Modified Example 2 In Modified Example 1 described above, when focus detection is not possible, focus is given priority, and when focus detection is possible, zoom driving is permitted. In Modified Example 2, after focus detection is disabled, focus detection is performed. Even if it becomes possible, zoom drive is prohibited until focusing is achieved. In this case, the control is simple, and the zoom drive and the focusing are not performed at the same time, so that the problem of a decrease in the battery voltage does not occur.

In this modification, the same changes as in the first modification are made except that the flow shown in FIG. 67 is changed as shown in FIG. First, the focus detection possible in # 1106, and calculates a defocus amount, the driving amount is determined by N1 = DF × K _L, flag LSF indicating that the low contrast scanning determines whether or not it is reset (# 1107 to # 1109). If the flag LSF has been reset, the zoom permission data is set, the subroutine for lens communication III is executed, and the flow advances to step # 1125. If the flag LSF is set in # 1109, the drive amount is set to N = N1, zoom inhibition data is set, the lens communication III subroutine is executed, zoom drive is inhibited, and the process proceeds to # 1165 (# 1161). ~ # 1164). In step # 1102, when the focus AFEF is set, N1 is set to 0, and the low contrast scan flag LS is set.
F is reset, and the process proceeds to # 1121 (# 1112 to # 1113).

Modification 3 FIG. 71 is a modification of the flow of FIG. In this modification, when the release switch S2 is turned on during zooming, zooming is prohibited even during zooming, and a release (photographing) operation is performed. First, at # 595,
If the release switch S2 is ON, it is determined in step # 610 whether or not the flag AFEF indicating focus is set. If the flag AFEF is not set, the process proceeds to step # 635. If the flag AFEF is set, it is determined at # 612 whether or not the release lock is set. With release lock,
Proceed to # 635. If the release lock has not been established, the process proceeds to step # 613, where it is determined whether or not the zoom is being performed.
Execute the processing from step 7. If the zoom is in progress, the zoom prohibition data is set in # 614, the subroutine of lens communication III is executed in # 615, and the zoom lens is stopped.
In step 6, the AF lens stop subroutine is executed, and the flow advances to step # 617. The third modification can be applied to the embodiment and the first and second modifications.

[Effects of the Invention] According to the present invention, in a camera including a vari-focal lens as a photographing lens, a target focal length serving as a target of zoom drive is calculated by adding or subtracting a predetermined amount to a current focal length. Then, the target focal length is periodically input to predict and calculate the defocus amount that occurs when the target focal length is reached, and the focus adjustment unit is controlled so as to eliminate the calculated defocus amount. There is an effect that the focus adjustment operation can be prevented from being delayed with respect to the zoom drive. In addition, since the zoom lens is driven to the target focal length when the zoom operation is canceled, no defocus occurs when the zoom drive is stopped, and the defocus caused by a change in the focal length of the varifocal lens is reduced. There is an effect that the correction can be performed well.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention, and FIGS. 2 (a) and 2 (b) are perspective views respectively showing an external configuration of a camera body and an interchangeable lens as one embodiment of the present invention.
Fig. 4 is a block circuit diagram of the same camera body, Fig. 4 is a block circuit diagram of the same interchangeable lens, and Figs. 5 to 29, 30 (a) and 30 (b) show the operation of the same camera body. FIGS. 31 to 49 are flow charts showing the operation of the interchangeable lens of the above, FIGS. 50 to 53 are flow charts showing the operation of the IC card mounted on the camera body of the above, and FIG. 54 is the same. 55 (a) to 55 (c) are views showing display examples on the display unit on the body, and FIG. 56 (a) is a view showing a display pattern in the viewfinder. (B) to (i) are diagrams showing display examples of the above, FIG. 57 is a diagram for explaining a method of focus correction of a varifocal lens, and FIG. 58 (a) shows a display pattern of a lens display unit. (B) to (e) of FIG. FIG. 59 is a view showing a cross-sectional structure of the interchangeable lens and a schematic configuration of the camera body of the above, FIG. 60 is an explanatory diagram of an operation of an optical system used for the interchangeable lens of the same, and FIG. FIG. 62 is a perspective view of an encoder used for the interchangeable lens according to the embodiment, FIG. 63 is a perspective view of a zoom encoder used for the interchangeable lens according to the embodiment, and FIG. 65 is an exploded perspective view, FIG. 65 is a development view of a main part of the above, FIGS. 66 (a) and (b) are a plan view and a cross-sectional view of an electric switch part used for the operation ring of the above, and FIGS. It is a flowchart which shows the modification of the said Example. 1 is a zoom operation means, 2 is a zoom drive means, 3 is a focus adjustment means, 4 is a focal length detection means, 5 is a zoom amount calculation means, 6 is a first control means, and 7 is a second control means.

Continued on the front page (72) Inventor Tetsuya Arimoto 2-3-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka Prefecture Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Hiroshi Otsuka 2 Azuchicho, Chuo-ku, Osaka-shi, Osaka No. 3-13 Osaka Kokusai Building Minolta Camera Co., Ltd. Examiner Koji Kashiwazaki (56) Reference JP-A-59-140408 (JP, A) JP-A-1-79714 (JP, A) JP-A 63-291016 (JP, a) JP Akira 63-289516 (JP, a) JP flat 2-93418 (JP, a) JP flat 2-181105 (JP, a) (58 ) investigated the field (Int.Cl. ⁶ G02B 7/02-7/16 G03B 3/00

Claims (3)

(57) [Claims] 1. A camera having a zoom lens and a focus adjusting lens, and a varifocal lens whose focus is deviated by driving the zoom lens as a photographing lens. Zoom driving means for driving the zoom lens in response to operation of operation means, focus adjustment means for driving the focus adjustment lens, focal length detection means for detecting the focal length of the taking lens, and zoom operation Zoom amount calculation means for adding or subtracting a predetermined amount to or from a current focal length detected by the focal length detection means at the time of operation of the means to calculate a target focal length as a target of zoom drive;
The target focal length calculated by the zoom amount calculating means is periodically inputted to calculate the amount of defocus generated when the target focal length is reached, and the focus is adjusted so as to eliminate the calculated defocus amount. First control means for controlling an adjustment means, and controlling the zoom drive means to drive the zoom lens to the target focal length calculated by the zoom amount calculation means when the operation of the zoom operation means is released. A camera comprising a varifocal lens, comprising: a second control unit. 2. The vari-focal lens is an interchangeable photographing lens detachably mounted on a camera body, wherein the zoom operating means, the zoom driving means, the focal length detecting means, the zoom amount calculating means, and 2. A camera comprising a varifocal lens according to claim 1, wherein said second control means is provided on a lens side, and said focus adjusting means and said first control means are provided on a camera body side. 3. A camera equipped with a varifocal lens according to claim 1, further comprising a finder capable of observing a focus state of a photographing screen.