JPH09211648A - Lens interchangeable camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption and prevent deviation of a defocus quantity from generating by transmitting data for prohibiting projection of an auxiliary light from the lens side to a microcomputer on the body side. SOLUTION: When an appropriate defocus quantity is not obtained by low contrast and the like, it is discriminated whether a lens is a LED auxiliary light allowance lens or a prohibition lens, and in the case of the allowance lens, an auxiliary light is ON. For letting the lens low-contrast-scan, a target drive quantity is set to be the maximum value by a focus lens drive command so as to drive the lens, and distance measuring operation is repeated again. The lens judges whether the auxiliary light is allowed to project toward a subject or not, according to assortment of the lens, and when the light projection is meaningless, data for prohibiting projection of the auxiliary light are transmitted to a microcomputer 10 on the body side. Consequently, useless auxiliary light is not projected, and hence power consumption can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens-replaceable camera, and more particularly to a lens-replaceable camera capable of reducing power consumption.

[0002]

2. Description of the Related Art A camera system has been proposed in which a microcomputer is mounted on a lens, and the operation of the camera is controlled while the microcomputer on the body side communicates with the microcomputer on the lens side. In such a camera, desired operation is performed by performing communication between various body-lens (hereinafter referred to as BL communication).

The conventional phase-difference-based distance measurement cannot be performed when the subject has low brightness or low contrast. In such a case, distance measurement can be performed by projecting light having contrast with the subject by means of the LED.
However, the wavelength of LED light is in the near infrared region.

Generally, the taking lens of a camera is designed so as to eliminate the focal shift due to the difference in the wavelength of light in the visible light region, but with respect to the light in the infrared region, the focal shift with respect to the visible light. Occurs. Therefore, usually, the data regarding the deviation amount is stored in advance for each lens, and the accurate defocus amount is calculated using the data.

[0005]

There are various types of taking lenses such as macro dedicated lenses and super telephoto lenses.
Since the macro dedicated lens only shoots at a very short distance, even if the LED auxiliary light is projected, the auxiliary light does not reach the subject in the focus area due to parallax. Therefore, projecting the AF auxiliary light is meaningless and wastes current consumption. Furthermore, when distance measurement is possible due to an increase in ambient light when the auxiliary light is projected, the distance measuring device determines that distance measurement is possible with the auxiliary light, and uses the above deviation amount data. Then, the defocus amount is calculated. However, since the distance measurement is not actually made possible by the auxiliary light but the distance measurement is performed by the increase of the ambient light (visible light), the defocus amount deviates by the amount of the shift amount.

Further, the super-telephoto lens is for photographing a subject at a long distance. However, the effective distance of the auxiliary light from the LED is generally about 10 m at most, and it is difficult to consider that the auxiliary light reaches a sufficient amount for most subjects. In that case, if the distance can be measured at the same timing as the above-described auxiliary light projection, the defocus amount is distorted as in the above case.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lens-replaceable camera capable of reducing power consumption and causing no defocus amount deviation. And

[0008]

A camera with interchangeable lenses according to the present invention is provided on the body side, and a body side microcomputer for controlling the operation of the camera and a lens side for controlling the operation of the lens side. Including the lens side microcomputer. On the body side, a projection means for projecting auxiliary light to the subject when distance measurement of the subject is impossible, a discrimination means for discriminating the type of the lens, and an auxiliary device according to the discrimination result by the discrimination means. It has a prohibition means for prohibiting the projection of light, and the lens side includes means for transmitting data for prohibiting the projection of auxiliary light to the body side microcomputer.

The lens determines whether or not the auxiliary light may be projected toward the subject according to the type of the lens, and when the projection is meaningless, the data for prohibiting the auxiliary light projection To the body side. Therefore, unnecessary auxiliary light is not projected, so that it is possible to reduce current consumption. Further, it is possible to prevent the defocus amount from being corrected when the distance measurement is performed with the infrared light even though the distance measurement is performed with the visible light.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the essential parts of a camera with interchangeable lenses to which the present invention is applied. Referring to FIG. 1, the interchangeable lens camera is composed of a body side and a lens side, and is controlled by a body side microcomputer 10 and a lens side microcomputer 30, respectively.

The body side microcomputer 10 has a photometric circuit 11
The distance measuring circuit 12, the auxiliary light output circuit 13, the dimming circuit 14, the flash 15, and the exposure circuit 16 are connected.

The photometry circuit 11 is capable of multi-division photometry and average photometry, and performs average photometry when a signal indicating that open photometry is not possible is received from the lens. The distance measuring circuit 12 measures the distance from the subject.

The auxiliary light output circuit 13 is an AF using an LED.
Emits auxiliary light. During low contrast or low light (hereinafter abbreviated as low contrast), light with contrast is projected onto the subject. When the subject is very close, the auxiliary light does not strike the subject in the AF area because of parallax.

The flash 15 is usually flashmatically (FM) controlled based on the subject distance. However, if an FM disable signal comes from the lens, TTL dimming control is performed.

The exposure circuit 16 controls the exposure according to the operation of the release switch described later.

A power supply voltage V _DD is applied to the body microcomputer 10 from a battery BAT via a DC / DC converter.

ON when the lens is attached to the body microcomputer 10.
The lens mounting switch SL that turns off when not attached, the main switch S0, the photometric distance measuring switch S1 that turns on by pressing the release button halfway and drives the photometric circuit 11 and the distance measuring circuit 12, and the full press of the release button turn it on. There are provided a release switch S2 for turning on and a program reset switch SP for initializing the operation mode of the camera when turned on.

The body side microcomputer 10 is provided with a power transistor PTR through which the lens actuator drive power supplies VP and PGND are supplied to the lens side.

The body side microcomputer 10 further includes a MOS
MOS field effect transistor F through the FET control terminal
ET is connected, and the power supplies VDD and DGND for the microcomputer and the logic circuit are supplied via this.

The body side microcomputer 10 and the lens side microcomputer 30 are mutually connected by a chip select signal line CSL, a serial clock line SCK, a serial in line SIN, and a serial out line SOUT, and their respective serial bus lines are connected. The body side microcomputer 10 and the lens side microcomputer 30 communicate with each other.

The in-body microcomputer 10 is connected to the data bag 20 on the body side via the signal lines SCK, SIN, SOUT and the signal line CSLDB from the body side microcomputer 10.

Next, the lens side microcomputer 30 will be described. The lens side microcomputer 30 includes a stepping motor STM connected via an aperture control circuit 31, a focal length detection circuit 32 for detecting the focal length of the lens, an aperture opening switch SAV for setting the origin at the aperture opening position, As will be described later, a speed detection circuit 40 for feeding back the lens so that it is in the correct position, and a focus drive control circuit 50 are provided. Focus lens motor 3 via focus drive control circuit 50
3 and the focus lens 34 are connected.

The speed detecting circuit 40 inputs a pulse generated according to the movement of the lens and measures the pulse interval.
If the previous and current measurement results are the same, "H",
If they are different, "L" is output. It is also possible to output the speed stabilization result for an arbitrary period. When the start of the measurement period is instructed, "H" is first output. Then, the pulse interval is measured in the same manner as described above, the measurement is repeated from the previous time, and the output is dropped to "L" at the time when the time is different. After that, the time is not set to "H" even if the time is the same until the measurement start instruction is given again. Further, it is possible to output data regarding the pulse interval (corresponding to the driving speed). Details will be described later.

At the time of manual focusing, the lens side microcomputer 30 has a power focus switch SPFN for performing power focusing in the near direction and a power focus switch SPF for performing power focusing in the far direction.
F, a focus hold switch SFH for holding the lens position when turned on, a mode selection switch SAF / MF for selecting each mode of auto focus / manual focus (AF / MF), and a macro switch SMACRO which is turned on in the switching macro mode are provided. Has been. The lens side microcomputer 30 performs a desired operation by operating each of these switches.

The lens side microcomputer 30 is further equipped with lens end switches SLI and SLN for detecting both ends of the lens movable range so as not to mechanically hit the ends during focus detection.
Is provided. The switch SLN is turned on at the near side, and the switch SLI is turned on at the far side.

The lens side microcomputer 30 uses the signal lines SCK,
In-lens E2P on the lens side via SIN, SOUT and a signal line SCLE connected to the lens side microcomputer 30
It is connected to the ROM 21. E2PROM2 in the lens
Reference numeral 1 stores lens adjustment data.

The data back 22 of the camera stores data for imprinting data such as date on a film.

Referring to connection signal lines SCK, SIN, and SOUT connecting the body side microcomputer 10 and the lens side microcomputer 30, these are communication between the body side microcomputer 10 and the lens side microcomputer 30, and the body side microcomputer 10 on the body side.
And the data bag 20, and the lens side microcomputer 30 on the lens side and the E2PROM 21 are connected so as to communicate with each other. Therefore, in order to determine which part communicates with which part using these signal lines. The chip select signal CSL is used for. Note that all of these signals are low active.

FIG. 2 is a diagram showing the internal structure of the speed detection circuit 40 shown in FIG. With reference to FIG. 2, the speed detection circuit 40 receives a pulse train provided from the lens side microcomputer 30 and measures a pulse interval, and a pulse interval measurement unit 41.
A first memory 42 that is connected to the pulse interval measuring unit 41 and stores the latest pulse; and a second memory 43 that is connected to the first memory 42 and that stores the latest previous signal;
It includes a comparator 44 connected to the first memory 42 and the second memory 43 and comparing the pulses stored therein, and a flip-flop circuit 45 connected to the input pulse train and the comparator 44. The pulse train input here is
This is an output from a photo interrupter (not shown) that detects the movement of the focus lens 34.

The comparator 44 checks, based on the data stored in the first memory 42 and the second memory 43, whether the lens is driven at a constant speed or is accelerated.

The flip-flop circuit 45 receives a period start signal for determining a predetermined time for speed detection from the lens side microcomputer 30, and accordingly outputs a signal indicating whether or not the speed within the period is stable. It The comparison circuit 44 outputs a signal indicating whether or not the speed is stable by comparing the pulse numbers of the first memory 42 and the second memory 43 as described above. From the first memory 42,
Pulse interval data representing lens movement (speed) is output.

FIG. 3 is a block diagram showing the internal structure of the focus drive control circuit 50 shown in FIG. Referring to FIG. 3, the focus drive control circuit 50 includes a lens position counter 51 that receives a counter reset signal and a lens movement pulse given from the outside, an up / down determination circuit 52 connected to the lens position counter 51, and a lens. It is connected to a position counter 51 and an up / down determination circuit 52, and is connected to a drive remaining pulse counter 53 and a drive remaining pulse counter 53 which receive a lens movement pulse and a remaining pulse number set signal indicating how far the lens can move. The motor drive direction determination circuit 54 and the drive necessity determination circuit 55, and the motor drive circuit 56 connected to the motor drive direction determination circuit 54 and the drive necessity determination circuit 55 are included. The output of the motor drive circuit 56 is input to the motor 33.

The remaining drive pulse number is represented by MSB in the drive direction, and the bits below the MSB represent the remaining drive pulse number, which approaches zero when the focus lens 34 is driven. The MSB of the data input to the remaining drive pulse counter 53 is set to 1 when the focus lens 34 is driven to the near side, and is set to 0 when the focus lens 34 is driven to the far side. The motor drive direction determination circuit 54 determines the drive direction of the motor. Bits other than the highest bit are connected to the drive necessity determination circuit 55, and the motor 33 is driven when the counter value is other than 0. The drive necessity determination circuit 55 outputs a drive / non-drive signal for determining whether to drive or not drive by referring to the value of the drive remaining pulse counter. The output from the remaining driving pulse counter 53 is also fed back to the up / down determination circuit 52. The lens position counter is reset when the position of the focus lens 34 is initialized or set to infinity. As a result, the counter value becomes 0 when the lens is located at the infinite position. When there is no particular target position for power focus, low contrast scan, etc., and when moving in a predetermined direction, the remaining drive amount is set to the maximum value. Then, when it is desired to stop, the remaining drive amount is set to 0.

Next, BL communication will be described. 4 to 7 are diagrams showing respective signals communicated during BL communication. The left column shows signals sent from the body side to the lens side, and the right column shows signals sent from the lens side to the body side. When performing BL communication, a communication header (HEB), which will be described later, is first transmitted from the body side to the lens side, and a communication header (HEL) is returned from the lens side. Subsequently, a communication mode signal is transmitted from the body side according to the state of the camera at that time, and a signal according to the communication mode is communicated between the body and the lens. The contents of each communication signal will be described below. The specific content of communication will be described later with reference to a flowchart.

The communication header HEB is a signal transmitted from the body to the lens at the start of BL communication. The discrimination signal ICPB for discriminating normal / abnormal communication is a signal for checking whether or not the BL signal serial line is normally connected. When the ICPB is other than "10", the lens transmits a signal (described later) for prohibiting the release to the body as an abnormality of the signal line.

The dedicated converter arrival determination signal MCP is a signal for detecting attachment of a dedicated intermediate accessory (teleconverter or the like). The intermediate accessory adds 1 to the communication header output from the body. When multiple intermediate accessories are mounted in series, the ICPB changes to a value other than "10" due to a digit overflow, so that the release is prohibited as described above. The details will be described later.

The signal EXTRING is a signal for detecting attachment of a general purpose intermediate accessory (bellows, etc.).
The intermediate accessory ORs 1 to the communication header from the body. By detecting this bit on the lens side,
When the attachment of general-purpose accessories is detected, the functions such as photometry are restricted. Details will be described later.

The dedicated converter type discrimination signal CNVID is a signal for detecting the type of the dedicated intermediate accessory. It is rewritten to the value peculiar to the accessory in the exclusive intermediate accessory. The lens discriminates the type of accessory from this signal and performs signal processing according to each accessory. General-purpose accessory arrival discrimination signal EXTRNG = 1
When the dedicated converter type determination signal CNVID ≠ 000, it is determined that the general-purpose intermediate accessory and the dedicated accessory are mixed and connected, and a release prohibition signal (described later) is transmitted to the body.

The communication header signal HEL on the lens side is BL
It is a signal transmitted from the lens to the body in response to the communication header HEB on the body side when communication is started. The communication normal / abnormal signal ICPL is a signal for checking whether or not the BL signal serial line is normally connected. When the signal ICPB is other than "10", the body determines that the signal line is abnormal (no lens) and performs the subsequent operation.

The release enable / disable signal REN is a signal indicating whether or not the lens side is in a shootable state. When the body side signal REN is 0, release is prohibited. However, if the signal ICPL is other than abnormal (≠ 10), it is ignored.

The reset start determination signal RRST is a signal indicating that the lens side has been reset and started. 1 is set at the time of communication after reset start, and 0 at the communication after the body / lens identification communication described later.
Becomes

Next, the body / lens identification signal will be described.
This signal is communicated so that the body side and the lens side can identify each other. The body identification signal BIDC is a signal for identifying the body type (model code).
The signal is represented by OOH.

The BL communication version (body) is a signal indicating the version of BL communication supported by the body side. The signal EXTRING is a signal for detecting attachment of a general-purpose intermediate accessory (bellows or the like) as described above. The signal EXTRNG input by the lens side is output as it is. The body side can detect that the general-purpose intermediate ACC is mounted by this signal.

The signal CNVID is a signal for detecting the type of dedicated intermediate accessory. The signal CNVID input by the lens side is output as it is. The body side can detect that the dedicated intermediate accessory is attached and the type of the intermediate accessory by this signal.

The lens identification signal LIDC is a signal for identifying the lens type (model code). The BL communication version (lens) signal VERL is a signal representing the BL communication version supported by the lens side.

The signal NOTINF is the focus lens 34.
Is a signal indicating whether or not the reference of the position of is in agreement with the optical ∞. It is 0 when they match and 1 when they do not match. The power focus lens signal PFLENZ is a signal indicating whether or not there is a lens having a power focus function. The signal AVUNIT is the resolution of the lens diaphragm (1 /
8 Ev, 1/4 Ev, 1/2 Ev, binary variable). The resolution of the lens diaphragm will be described later.

Next, a BL request acquisition signal indicating communication for transmitting various requests and states of the lens to the body will be described. This signal is represented by 01H.

AF / MF signal AFM is the AF / M of the lens
This is a signal for notifying the body of the state of the F selection switch. When this switch is a push switch,
AF / MF is switched each time it is turned on. When the lens is a switchable zoom macro, it is treated as MF. AF return possible /
The disable signal RAFEN is a signal for informing the body of the state of the AF / MF selection switch of the lens. RAFEN = 1 when this switch is a push switch
Becomes

The focus drive enable / disable signal FDEN is a signal indicating whether or not the actuator of the focus lens 34 can be driven.

The direct PF inhibit signal LMFSW is a signal for informing the body of the state of the switch for inhibiting direct power focus. In this embodiment, the AF / M switch is also used as this switch. The body switches prohibition / permission of direct power focus when the AF / MF selection switch SAF is turned on when the main switch is turned on. Here, the direct power focus refers to an operation that enables power focus without switching to the manual focus mode when the metering / distance measuring switch S1 is turned on to perform AF.

The power supply request signal REQPWR is a signal for requesting the body to supply power supply. This is a signal for requesting a power supply from the lens side when a function that is not currently used (such as image stabilization) is installed in the lens in the future.

The power supply use signal USEPWR is a signal indicating that the power supply is being used.

The serial bus use request signal REQBUS is a signal for requesting the body to open the serial bus line when it is desired to use the serial bus in the lens.
It is used when the lens side microcomputer 30 communicates with the E2PROM 21 in the lens.

The mechanical initialization request signal REQRES is a signal requesting initialization of a mechanical portion in the lens. When the lens mechanism initialization command is sent from the body side, "1" is maintained until the initialization is completed.

The LED auxiliary light prohibition / permission signal AFLEN is a signal for permitting / prohibiting the auxiliary light projection by the LED when distance measurement cannot be performed due to low contrast, low luminance, or the like. With a macro lens or the like, since parallax does not allow auxiliary light to enter the subject in the AF area, light projection is prohibited. For the focus hold request signal REQFA1, the focus hold button is operated and the focus hold switch S
This is a signal for notifying the body side that the FH has been turned on.

The PF operation request signal REQPF is a signal for informing the body side that the power focus switches SPFN and SPFF are operated.

The switching macro signal MACRO is a signal for notifying the body side that the lens side is set to the switching macro state.

Next, a lens storage command, which is a command for setting the focus lens 34 to the shortest state, will be described.
When the lens side receives this signal, the focus lens 34
Focus drive, zoom drive (for power zoom lens), and collapsible (electrically retractable lens) are performed so that This signal is represented by 02H.

Next, a lens mechanism initialization command RSETL which is a signal for initializing the mechanical portion on the lens side.
Will be described. This signal is represented by 03H. When the lens side receives this command, the focus lens 34,
Initialize the aperture.

Next, the low power consumption mode transition command STADYBY for instructing the activation condition from the lens side when the body side microcomputer 10 sleeps will be described. This signal is represented by O4H.

The PF operation permission / prohibition signal PFWEN is a signal for permitting / prohibiting the activation from the lens side to the body side by the power focus operation. The lens side microcomputer 30 does not need to respond to the power focus operation, and power consumption can be reduced.

The activation factor permission rank signal SRANK is data for permitting / prohibiting the activation factor from the lens side to the body side when the body side is in the sleep state, and is divided into three ranks, which is determined by the operation state of the body side. To be done. Rank 1 corresponds to flash charging when the switch S1 is on. Basically, activation from the lens side is not possible, and activation is performed only when the lens is abnormal. Rank 2 corresponds to flash charging when the switch S1 is off. The activation is permitted by the switching operation of the switch SAF / MF. Rank 3 corresponds to a sleep mode other than the above. Responds to all operation switches.

Low power consumption shift enable / disable switch STBYEN
Is a signal indicating whether or not it is possible to shift to the low power consumption mode. After this communication, the body goes to sleep.

Next, the serial bus use permission signal BUSFREE which permits the use of the serial bus on the lens side will be described. This signal is represented by 05H. The body side opens the serial bus line after this communication is completed.
Upon receipt of this signal, the lens side communicates with the local device (E2PROM 21 etc.) in the lens. After the end of communication, the lens side informs the body side of the end of communication by setting the signal CSLNS to "A".

Next, the photometric data acquisition signal GETED for communicating data relating to photometry will be described. This signal is represented by 06H.

The environmental temperature signal TEMP represents temperature data measured on the body side. Shooting maximum F number signal AVM
AX represents the maximum F number of the lens. The shooting open F-number signal AV0 indicates the open F-number based on the optical design document of the lens.

The photometric open F-number signal AVE indicates the maximum optical F-number determined by the light beam passing through the lens when the diaphragm is at the maximum aperture position.

The mechanical open F number AVM is the maximum F number determined by the position (diameter) of the blade when the diaphragm is at the maximum hole diameter position.

The effective F number deviation signal ΔAV is data of the change in the effective F number when the focus lens 34 is extended.

The photographing magnification signal β is photographing magnification data.
It is obtained from the focal length of the lens and the payout position of the focus lens 34.

The shooting distance DV represents shooting distance data.
It is obtained from the delivery position of the focus lens 34.

The focal length signal FV represents focal length data. Exit pupil position 1 signal PZ1 and exit pupil position 2 signal P
Z2 is an image height of 5 m when the aperture is in the open position.
Represents exit pupil position data corresponding to m and 14 mm.

The vignetting amount 1 signal RLO1 and the vignetting amount 2 signal RLO2 are respectively image heights of 5 mm and 14 corresponding to an image height of 0 mm when the aperture is at the open position.
The data of the illuminance change amount in mm is shown.

The peripheral illuminance ratio change rate signal ΔPRE is data representing the difference between the illuminance reduction amount when the image height is 14 mm at the aperture open position and the image height is 0 mm, and the illuminance reduction amount when the aperture is narrowed down to 1 Ev. Normally, the illuminance of a lens is improved by narrowing it down. On the body side, the above signals PZ1, PZ2,
A peripheral illuminance reduction amount at an arbitrary aperture is calculated based on RL01 and RL02 and this information.

The open metering enable / disable signal MEOK is data indicating whether or not open metering is possible. If the aperture is not open, metering is disabled.

Multi-division / SPOT photometric enable / disable signal SAM
EN is data indicating whether multi-division photometry or SPOT photometry is possible. When a general-purpose intermediate accessory is attached, multi-segment / SPOT metering is prohibited. In that case, the body performs average photometry.

The DV / β usable / unavailable signal DVEN is data representing whether or not the photographing magnification information β and the photographing distance information DV can be used.

FM control enable / disable signal FMEN is data indicating whether flashmatic control is possible.

The open correction cam use signal AVSHIFT is data representing whether or not the open correction cam is used. When the opening correction cam is not used, the diaphragm can be set in increments of diaphragm resolution based on the mechanical opening F number. When using the correction cam, the aperture resolution is doubled by one step from the mechanical open F number AVM.
Details will be described later.

Next, the current aperture value acquisition signal GTAV for performing communication for obtaining data relating to the current aperture value will be described. This is represented by O7H. The current aperture value signal AVNOW indicates current aperture position data. The diaphragm drive / stop signal AVMV is data representing whether or not the diaphragm is being driven. Normal aperture drive is lens time lag RT
It is prepared for the purpose of detecting that the diaphragm drive is not completed due to an abnormality, etc.

The diaphragm energization / non-energization signal AVHLD is data representing whether or not the diaphragm energization is being held.

Aperture drive command response completion / incompletion signal FINM
VA is an aperture drive command MOVAV and an aperture stop command S, which will be described later.
It is data indicating whether or not the processing on the lens side has responded to TOPAV. It becomes 0 when a command is issued and becomes 1 after the processing response is completed.

The diaphragm abnormality / normal signal AVERR is data indicating that an error has occurred in driving the diaphragm.

Next, the diaphragm drive command MOVAV for causing the lens to drive the diaphragm will be described. This is represented by 08H. The target aperture value signal AVT is data representing the target F number.

Communication for releasing the holding of the energization of the diaphragm motor is performed by the diaphragm stop command signal STOPAV. This is represented by 09H.

Next, the distance measurement data acquisition signal GETAD for performing communication for acquiring data relating to distance measurement will be described. This signal is represented by 0AH.

The feed amount conversion coefficient KP is data representing the relationship between the defocus amount and the feed amount.

The focal length signal FVLAT during distance measurement represents the focal length information during distance measurement integration designated by the distance measurement integration time lag.

Focus lens position signal DVPL during distance measurement
AT represents the position information of the focus lens 34 at the time of distance measurement integration designated by the distance measurement integration time lag.

The distance operation ring direction signal FADIR is data representing the relationship between the rotation direction of the distance operation ring and the moving direction of the focus position. In the normal focus operation ring and the switching type zoom macro, the operation direction of the zoom operation ring and the moving direction of the focus are associated with each other.

Speed stable / unstable (result) signal LS during distance measurement
TAB1 is data representing whether or not the drive speed of the focus lens 34 is stable during the distance measuring component. It is considered to be unstable when there is a change in the drive speed between the distance measurement synchronization LAT communication and the main communication.

Next, the distance measurement synchronization signal LAT that informs the lens side of the timing of distance measurement will be described. The distance measurement integration time lag signal DELAY represents time lag information from the end of this communication to the center of integration for distance measurement which starts next. The lens side stores the lens position after the designated time has elapsed.

The lens speed stable (speed stable / unstable) signal LSTABO is information indicating whether the drive speed of the focus lens 34 is changing (unstable) or stable (including stop).

Next, the focus lens drive state acquisition signal GETLST for performing communication for acquiring each state of the focus lens 34 will be described. This signal is 0CH
Is represented by The focus lens position signal DVP represents current position information of the focus lens 34. Based on the optical ∞ position, the near side is positive and the over ∞ side is negative.

Focus lens drive direction signal FLDIR
Represents drive direction information of the focus lens 34. The focus lens drive speed signal LSPEED represents information on the drive speed of the focus lens 34. The focus lens end / non-end signal FLEND is the focus lens 3
4 represents the information as to whether or not it is at the end position.

Focus lens driving / stopping signal FL
MV represents information as to whether the focus lens 34 is being driven.

The focus lens drive command response completion / incompletion signal FINMVL represents information indicating whether or not the response to the drive command of the focus lens 34 is completed. It becomes 0 when the focus lens drive command is received, and becomes 1 when the processing response is completed.

Next, the focus lens drive command MOVL for driving the focus lens will be described.
This signal is represented by 0DH.

Focus lens target drive amount signal TDVP
Represents drive amount information of the focus lens 34. The rotation direction is distinguished by the sign of the data.

The automatic inversion processing presence / absence signal AREV is a signal for instructing whether or not to perform the automatic inversion processing.

The moving amount correction presence / absence signal MCEV is a signal for instructing whether or not the moving amount correction is performed.

A focus lens stop command STOPL is used to stop the drive of the focus lens 34. This is represented by 0EH.

In a lens capable of switching AF / MF, A
An AF / M switching command is used to instruct switching of F / MF. This is represented by 0FH.

The PF drive permission signal MOVPF is used to permit the power focus drive to the lens. This signal is represented by 10H.

An infinite set command MOVINF is used to drive the lens to the optical ∞ position. This signal is 11H
Is represented by

The power supply signal PWRSPL is used to notify the lens side of the start of power supply. This is represented by 12H.

To stop using the power supply,
The power supply use prohibition signal PWRSTP is used. This is represented by 13H.

The dummy communication that does nothing is represented by the NOP signal as no operation. This signal is represented by 14H.

In addition to the above, the power supply PWRSPL for notifying the lens side of the start of the power supply and the power supply stop PWS for stopping the use of the power supply
There is a TP signal.

FIG. 8 is a perspective view showing the external appearance of the body side of a camera to which the present invention is applied. Referring to FIG. 8, the body 5 is a shutter button 6 provided on the upper portion of the body 5.
1, an internal flash 62, and an accessory shoe 63 for attaching an accessory. On the front of the body 5, a self-timer / remote control operation indicator 64
And a remote control receiver 65 for receiving a remote control signal.
And a lens removal button 66 for removing a lens (not shown), and a lens index 69 for attaching a lens (not shown) at a predetermined position. A diopter adjustment dial 67 for adjusting the diopter of the finder and a film chamber 68 for loading a film are provided on the side portion of the body 5.

FIG. 9 is a sectional view of the lens 7 of the camera to which the present invention is applied. Referring to FIG. 9, the lens 7 is attached to the body 5 via a signal contact 81 provided on the lens mount 80. A focus lens 34 is moved to the lens 7 along the photometric axis in the arrow direction in the figure. The focus lens 34 is engaged with a focus drive force transmission mechanism 78 via a focus lens ball frame 79, and this is driven by a focus drive motor 77. Lens 7
The optical axis of the aperture is 8 on the body side of the focus lens 34.
Is provided. The diaphragm 8 is composed of a plurality of parts assembled in the housing 73. This will be described later. Stepping motor 7 for driving diaphragm 8
1, the motor base plate 7 of the stepping motor 71 is provided.
The diaphragm drive plate 74 is driven via the diaphragm 2, and the diaphragm blades 75 are provided between the diaphragm drive plate 74 and the cam plate 76.

FIG. 10 is a diagram showing the structure of the diaphragm 8. With reference to FIG. 10, various components are assembled to the housing 73 to form the diaphragm 8 as described above. A pin 84 and a pin 85 project in the vertical direction from the aperture blade 75, the pin 84 engages with the hole portion 86 of the aperture blade 75, and the pin 85 engages with the hole portion 87 of the cam plate 76. When the stepping motor 71 is driven, the diaphragm drive plate 7 is accordingly driven.
4 is rotated and its movement causes hole 86 and pin 84
The aperture blade 75 is moved in the direction of arrow a through the pin 85, and the pin 85 on the other side is moved along the groove 87 formed in the cam plate 76, thereby controlling the size of the opening 88.

Next, the specific contents of the BL communication will be described with reference to the flowchart. First, the flow on the body side will be described.

FIG. 11 is a flow chart showing the processing on the body side during BL communication. With reference to FIG. 11, when the lens is in the sleep state (when the low power consumption mode transition command is output to the lens and the body is activated from the sleep state other than when the lens is activated), the chip select signal CS
After L is dropped to “L” for 50 μSEC, the startup lens is activated. Wait until the lens can communicate (5
Communication is started from 0 mSEC (steps S101 to S101).
S104, the following steps are omitted).

The signal SCL is set to "L" (S105), the communication header HEB is output (S106), and then HEL is input from the lens (S107). When the signal HEL is checked and the signal HEL is not input, it is determined that the lens is not mounted and the power to the lens is turned off (S
108, NO, S116, S117).

When the signal HEL is input (S108
If the lens is reset-started by looking at the signal RRST, "GETTYP" is exchanged to exchange the other identification signals and the like, and a mechanical reset is instructed (S1).
09-S111). If the microcomputer on the lens side is reset when the lens is attached, the identification data is sent from the body side to the lens side by sending a signal indicating that the lens side microcomputer has been reset to the body side microcomputer. It becomes possible to perform a reset. As a result, it is possible to prevent the lens from malfunctioning.

Thereafter, the communication mode data is transmitted (S11
2), data communication is performed according to the communication mode (S1
13, S114). When performing data communication in multiple modes, CSL remains "L" for a predetermined time (1 mSE
C) Wait for the next communication (S115). In the following flow charts, the repetitive communication described above is performed when the communication is continuous. Signal CS when communication is completed
The communication is ended by setting L to "H" (S118). The above operation is executed at the time of various communications described below. In the following flow charts, only the communication mode name is described.

FIG. 12 is a flow chart showing the processing after the battery mounting. Referring to FIG. 12, when the battery is installed, the operation starts to "START". First, the switch SL is used to check whether or not a lens is mounted (S121), and if the lens is mounted, lens communication (described later) is performed (S122). The flow after "main" is the flow during normal operation.

If the lens is removed (N in S123,
O), supply of the lens power supply LVDD and power supply is stopped (S124, S125).

When the lens is mounted, lens communication described later is performed (S127). First, the switch state is input (S128). If the switch S0 is turned off, "S0OF"
F processing "(described later) is performed (S130, S14).
0).

When the switch S0 is turned on, the "S0
"ON processing" is performed (YES in S130, S140).
If the switch S0 is on, "BL request acquisition" described later is performed (S131). When the switch S1 is turned on, "S1ON" described later is performed (YES in S132, S14).
1). If the switch SP is turned on, "reset" described later
Is performed (YES in S133, S142).

If the switch SINF is turned on, DV
It is determined whether the P reference is infinite, and if it is infinite, the infinity mode (MF & infinity fixed) is set. If the DVP standard is not infinite, setting to infinity mode is prohibited (S1).
34, S143, S144). If the switch SINF is off, the normal mode (AF OR MF) is set (S13).
4, S135).

When the switch operation on the body and the lens is not performed for the predetermined time (1 minute) (YES in S136),
In order to put the lens side microcomputer 30 into a sleep state, a "power saving mode transition command" is transmitted to the lens, and when a signal of transition OK is received from the lens, the sleep state is entered (S137-
S139). The activation from the sleep state is performed by changing the switch state and the activation signal from the lens (CSL =
"L").

FIG. 13 is a flowchart showing the BL request acquisition subroutine. Referring to FIG. 13, various information on the lens side is input by the “BL request acquisition” communication (S1
51). When there is a serial bus use request, a "serial bus request" described later is performed (S152, S153). If there is a power supply request, a "power supply request" described later is performed (S154, S155). When there is a mechanical initialization request, "mechanical reset" described later is performed (S156, S
157). When there is a power focus operation request, power power is supplied to perform "power focus drive permission" communication (S158 to S160). FIG. 14 is a flowchart showing the program reset process. Referring to FIG. 14, since the lens may be moving, the “focus lens stop command” is transmitted (S171), and the lens stop is confirmed by the “focus lens drive state acquisition” communication (S172 to S174). .

If "lens request acquisition" communication is performed and the lens is capable of returning to AF and is in MF mode, "AF / M switching command" is transmitted, and the "lens request acquisition" communication is used to switch to AF mode. If confirmed, "mechanical reset" described later is performed (S174 to S180). After that, various setting positions (exposure mode, exposure correction, etc.) set on the body side are set to predetermined positions and the process returns to "main" (S1).
81, S182).

By transmitting data indicating whether or not the focus mode can be switched in response to a request from the body side,
On the body side, in a lens in which the focus mode can be switched, the lens can be returned to the AF mode in a predetermined sequence. Further, it is possible to prevent the focus mode change instruction from being issued to the lens whose focus mode cannot be switched, so that the focus modes do not differ between the body and the lens. As a result, a lens-replaceable camera that is easy to use can be provided.

FIG. 15 is a flow chart showing the contents of the S0OFF process. Referring to FIG. 15, since there is a possibility that the lens is moving, a “focus lens stop command” is transmitted, and the stop of the lens is confirmed by “focus lens drive state acquisition” communication (S191 to S193). Turn on the power supply and send a "lens storage command" to bring the lens to the shortest position (S194, S195), and turn off the power supply after confirming that the storage is completed by the "lens request acquisition" communication. (S196, S197). Then, in order to put the lens side microcomputer 30 into the sleep state, a "power saving mode transition command" is transmitted to the lens, and when the signal of the transition OK is received from the lens, the sleep state is started (S204-).
S206). The activation from the sleep state is performed by changing the switch state and the activation signal from the lens (CSL =
"L").

FIG. 16 is a flow chart showing the contents of the S0 ON process. Referring to FIG. 16, first, "lens request acquisition" communication is performed (S211), and if the LMFSW data is "1", the direct PF prohibit mode and the permission mode are switched (S212 to S215). In this embodiment, the LMFSW data is AF / M on the lens side.
It is set / reset in conjunction with the on / off state of the F selection switch. When the main switch S0 on the body side is turned on, if the switch is turned on, the mode is switched. You may provide the switch for switching independently.

If the lens is a lens capable of returning to the MF mode and the AF mode, an "AF / M switching command" is transmitted, and after confirming that the AF mode has been switched by the "lens request acquisition" communication, it will be described later. Perform "mechanical reset" (S
216-S221).

Next, flash charging is performed. First, it is determined whether or not charging is completed (S222), and if not completed, a "low power consumption mode transition command" is transmitted to put the lens in a sleep state (S223). At this time, the power focus is prohibited and the activation factor permission rank is set to 2 based on PFWEN and SRANK data, that is, AF / MF.
Allows activation from the lens only when the selection switch is operated. Then, charging is started, and the device itself enters the sleep state (S225, S226). The activation from the sleep state is performed by the change of the switch state on the body side and the activation signal (CSL = “L”) from the lens.

17 and 18 are flowcharts showing the processing when the switch S1 is on. The flow when the switch S1 is on will be described with reference to FIGS. 17 and 18. First, turn on the power supply (S2
31). "Infinite set command" to the lens in infinity mode
Is transmitted, the lens set to the infinity position is confirmed by the “focus lens drive state acquisition” communication, and the flow advances to a photometry sequence (the same flow will be described later) (YES in S232, S233, S254 to S257).

In the MF mode, the lens may have been moved by power focus. Therefore, a "focus lens stop command" is sent, and the "focus lens drive state acquisition" communication confirms that the lens is stopped and metering is performed. Proceed to the sequence (described later) (NO in S233, YE in S234).
S, S251-S253).

Since it is necessary to stop the lens even when the focus hold switch is operated, the above operation is performed (YES in S235, S251 to S253). Further, when the information that the switching macro is set is obtained from the lens, the same operation is performed in the infinity mode (S2).
36, YES, S254 to S257).

Since the lens side microcomputer 30 transmits data indicating whether the lens having the switching macro mechanism is in the switching macro state to the body side microcomputer, the body side microcomputer indicates that the lens is in the switching macro state. I can know. Therefore, the AF operation can be prohibited during the switching macro, and useless current consumption can be prevented. Further, by fixing the focus lens 34 to an infinite optical position, it is possible to provide photography with good optical characteristics.

In other cases than the above, first, "distance measurement synchronization" communication is performed to output an integration time lag, and data of whether or not the lens speed is stable (stable when the lens is stopped) is input (NO in S236, S238). , S239). If the lens speed is stable, CCD integration is performed (S2
40). Data indicating whether or not the moving speed of the focus lens 34 is stable from the start of integration to the end of integration is transmitted to the body side. Therefore, if the lens speed becomes unstable during the integration period, the body side performs integration. It becomes possible to discard the distance measurement data by and immediately start the next distance measurement, so that the correct distance measurement value can always be obtained. As a result, it is possible to provide a camera with a replaceable lens that does not cause a distance measurement error.

During low contrast scanning, CCD integration is unconditionally performed (YES in S242, S244). Then, perform “distance measurement data acquisition” communication, input the data required for distance measurement, and input the data as to whether the lens speed remained stable during CCD integration. If not, the distance measurement data Therefore, the distance measuring operation is repeated again (NO in S242, NO in S243). During low-con scan, proceed to the following regardless of speed stability.

Here, the lens speed is ignored during the low-con scan because the distance measurement during the low-con scan cannot be expected to be highly reliable even if the defocus amount is obtained. This is to prioritize the determination as to whether or not it is within the area, and to improve the usability.

Next, if the auxiliary light is projected, the auxiliary light is turned off and the data in the CCD is dumped (S244, S2).
45). Then, input the lens status in the "Focus lens drive status acquisition" communication, and use the distance measurement data to perform AF.
Calculation is performed (S246, S247).

If in focus, "STOPL" is transmitted to stop the lens (NO in S248, S249,
(S250), it is confirmed that the lens is stopped, and the process proceeds to a photometry sequence described later.

When an appropriate defocus amount is obtained, the lens drive amount obtained as a result of the calculation is set and the "focus lens drive command" is transmitted. Automatic reversal processing and movement correction are assumed.

If an appropriate defocus amount cannot be obtained due to low contrast (YES in S248), the lens is LE.
D Auxiliary light permission lens or prohibited lens is discriminated ("GETR
EQ "according to the communication result" (S260), if the lens is permitted, the auxiliary light is turned on (S261), and the target drive amount is set to the maximum value by the "focus lens drive command" in order to cause the lens to perform low contrast scanning. Lens drive to repeat the distance measuring operation (S262, S
263: YES). Depending on the type of lens, the lens determines whether or not it is possible to project the auxiliary light toward the subject, and if it does not make sense to project the auxiliary light, the data for prohibiting the auxiliary light is sent to the body side. Send to. Therefore, unnecessary auxiliary light is not projected, so that it is possible to reduce current consumption. Further, it is possible to prevent the defocus amount from being corrected when the distance measurement is performed with the infrared light even though the distance measurement is performed with the visible light.

The automatic reversal processing and the movement amount correction are omitted because the reliability of the distance measurement data is low. The scanning direction is appropriately determined according to the relationship between the current lens position and the lens end position, the current lens movement direction, and the like.

When the switch S1 is prohibited from being turned off after the "focus lens drive command", the auxiliary light is turned off, the lens is stopped, and the power source is turned off to return to "main".

When performing photometry, various photometry data are first input from the lens by "photometry data output" communication. Then, photometry is performed by the photometry circuit 11, and exposure calculation is performed using the above data and the like (S258). As a result of the exposure calculation, if it is determined that the flash emission is necessary, it is determined whether or not the charging is completed (YES in S259).
(S, S279), if completed, sends a "low power consumption mode transition command" to put the lens into a sleep state (S
280-S283). At this time, PFWEN, SRANK
According to the data, the power focus is prohibited and the activation factor permission rank is 1, that is, the activation from the lens is prohibited. Then, charging is started, and the self enters the sleep state (S28
2, S283). The activation from the sleep state is performed by changing the body side switch state and the activation signal (CSL from the lens).
= “L”).

If the switch S2 is turned on, "NO"
P "communication is performed to determine whether release is possible (S
If YES, S272, S273), and if possible, the process proceeds to "S2ON" described later (S274). If the switch S1 is off, the lens is stopped (NO in S266, S2
67), the power source is turned off and the operation returns to "main" (S268 to S271).

If the switch S1 is turned on (S26
If YES in step 6), "lens request acquisition" communication is performed, and if there is a power focus request and direct power focus permission mode, "PF drive permission" communication is performed, and the processes after the determination in S2 are repeated (S275 to S278).

Next, the processing when S2 is on will be described with reference to FIG. In the direct power focus enable mode, the lens may be moving, so send "STOPL" to stop the lens and then "GETLS".
T "communication confirms that the lens is stopped and the mirror is raised (S291 to S295). Then, the target aperture value is transmitted by the" aperture drive command "and the release time lag time obtained by" body / lens identification "is set. After waiting, “current aperture value acquisition” communication is carried out (S297, S298) If aperture driving is not completed, it is determined that some abnormality has occurred in the lens, a “aperture stop command” is transmitted to stop the aperture driving, and error processing is performed. (Abnormality display, operation stop, etc.) are performed (S29
9: NO, S300: YES, S319, S320).
Further, similar processing is performed when aperture-shaped data (AVERR) is transmitted (YES in S300).

If the diaphragm drive is completed, it is determined whether or not the shutter speed is 4 seconds or less (NO in S300, S30
1) When the time exceeds 4 seconds, a "diaphragm stop command" is transmitted to stop diaphragm drive (stop energization). Then, the shutter is driven, and the mirror is lowered after the exposure is completed (S303, S
304). Then, use the "aperture drive command" to drive to the mechanical open aperture value, monitor the aperture value with the "get current aperture value" communication, and stop the aperture drive with the "aperture stop command" when the mechanical aperture value is reached (energize Stop) (S303 to S31
0). Then, GTREQ communication is performed to check whether or not the lens uses the power source (S311,
S312). If it is used, the use of the power source is prohibited by STPPWR communication, and if the use of the power source is stopped, the power source supply is stopped (S313 to S316). Next, the film is wound up to return to the "main" (S317,
S318). AVERR is also checked when the aperture is opened, and if abnormal aperture data is sent, the abnormality processing is performed. Aperture drive to the photometric aperture value is performed for a predetermined time (100
If it does not end within mSEC), it is determined that there is an abnormality in the lens and the diaphragm drive is stopped to perform abnormality processing.

Next, the processing when the serial bus is released will be described with reference to FIG. First, the data back 20 is made to open the serial bus (it is instructed not to perform communication by the serial bus until there is a serial communication request (CSL = “L”) from the body side microcomputer 10). Then, send "Serial bus use permission" to the lens, and CSL =
"L", that is, wait for the end of the local communication of the lens (S
331-S333). When CSL = "L", the release of the serial bus release command is notified to the data back 20 and the process returns (S334).

When the lens-side microcomputer performs data communication with other circuits in the lens, the body-side microcomputer sharing the signal line is prohibited from data communication in the body. As a result, even if the signal line is shared, it is not necessary to provide a gate circuit, and the cost can be reduced.

Next, the "power supply" flow will be described with reference to FIG. Power supply (PWRSP
L) After communication, turn on the power supply (S33)
5 to S337).

Next, the mechanical reset flow will be described with reference to FIG. The power supply is turned on, the "lens initialization command" is transmitted, the GETREQ communication confirms that the reset is completed, the power supply is turned off, and the process returns (S341 to S345).

Next, a communication flow when the lens is attached will be described with reference to FIG. First, LVDD is supplied to the lens (S351). Then enter the CSL status and
It waits until L becomes “H” → “L” → “H”, that is, the preparation for communication on the lens side is completed (S352 to S35).
4). After the microcomputer 30 on the lens side resets and starts, by outputting a communication enable signal from the lens side,
The time from mounting the lens to the start of communication can be shortened. Then, the communication is started with CSL = "L" (S354).
First, the communication header HEB is transmitted (S355). Then, the communication header HEL is input to determine whether the communication is normally performed (S356, S357). If there is an abnormality, it is determined that there is no lens, LVDDOFF, the power supply is turned off, and C
The communication ends with SL = "H" (S360 to S36).
2). If normal communication is made (YES in S357),
"Body / lens identification" communication is performed, and mutual identification signals are communicated. Then, the above-mentioned "mechanical reset" is performed, CSL = "H" is set, and the communication ends (S358,
S359, S362).

Next, the flow chart on the lens side will be described. FIG. 24 is a flowchart showing the processing when the power is turned on (when the lens is attached). Referring to FIG. 24, first, R
Make initial settings such as AM initialization, then set CSL to 1
"L" between mSEC is notified to the body that communication is possible (S401, S402). It waits for the body to set CSL to "L" (S403), and when it becomes "L", the communication header HEB is input from the body and predetermined processing described later is performed (S404). Then, the communication normality / abnormality is discriminated, the attachment of the intermediate accessory is detected, and the result is sent to the body by the communication header HEL (S405). Then, mutual identification data are exchanged by "body / lens identification" communication (S406). After that, each switch (S
The input of PF, SPN, SFH) is repeated (S407).
At this time, CSL = “L”, and the interrupt by turning on the AF / MF selection switch is permitted.

Next, the HEB routine described in S404 of FIG. 24 will be described with reference to FIG. After the HEB communication, the ICPB is checked to determine whether the communication is normally performed (S501, S502).
If it is abnormal, REN is set to 0 to inform the body that release is impossible due to communication error (S5).
21).

During normal operation (NO in S502), it is determined whether or not the MCP has a dedicated teleconverter (one of the plurality of interchangeable lenses usable in the camera) (S504), and the teleconverter is attached. At this time, it is further determined whether or not a general-purpose accessory is attached (S50
6). If a general-purpose accessory is attached, set REN = 0 (S521).

When the general-purpose accessory is not attached, the type of teleconverter is determined (S507), and it is determined whether the teleconverter is a dedicated teleconverter for the lens (S50).
8). If it is not for that lens, REN = 0. If it is a dedicated teleconverter, the type of teleconverter is stored (S50
9). In addition to various data (opening / closing aperture value, etc.) for the lens alone, the body also stores in advance the various data when the teleconverter dedicated to the lens is mounted. Therefore, thereafter, data such as the aperture value and K value according to the stored teleconverter type is sent to the body.

When the dedicated teleconverter is not attached, it is determined whether or not a general-purpose intermediate accessory is attached (S5).
10). If a general-purpose accessory is attached, it is memorized that the accessory is attached, and SAMEN = 0 is set to prohibit multi-division / spot photometry (S51).
2, S513). Also, Dv value cannot be used, and DVEN = 0, FMEN = 0 to notify the body that FM control is impossible.
(S514, S515).

S when general-purpose accessories are not included
AMEN, DVEN, FMEN = 1 (S516-
S518). These data are sent to the body during the "photometric data acquisition" communication. After the above operation, this communication is reset and started to determine whether it is the first communication (S519). If it is the first communication, in order to request the body to perform "body lens identification communication", RR
ST = 1 is set (S520). RRST is cleared to 0 at the end of the "body lens identification" communication.

Next, in the case of a lens that can be retracted, it is determined whether or not it is in a retracted state (S521). In the collapsed state, REN = 0 is set to prohibit the release (S522). If not, REN = 1 is set (S523). Whether or not it is in the collapsed state is detected by a zoom encoder (not shown). Here, the collapsing means shortening the overall length of the lens by making the lens interval shorter than the normal use distance when the lens is used. In this case, shooting is not possible.

After performing the above processing, "HEL" communication with the body is performed in synchronization with the serial clock from the body (S405).

Next, with reference to FIG. 26, the flow when an interrupt occurs will be described. If the AF / MF selection switch is turned from OFF to ON, the AF / MF mode is switched (S4).
11-S414). A changeover macro switch is input, and if it is on, MACRO = 1, and if it is off, MACRO = 0 (S415 to S418). And if CSL = "L",
Since there is a communication request from the body, communication is started (S4
19). Input the communication header HEB from the body (S5
20). This routine is as described in FIG. Then, the communication normality / abnormality is discriminated, the attachment of the intermediate accessory is detected, and the result is sent to the body by the communication header HEL (S421). Communication mode data is input (S422), and communication is carried out according to a predetermined rule according to each communication mode (S423, S42).
4). While CSL = "L", a plurality of communication modes can be continuously communicated (S425). When the communication is completed, the operation described later is performed according to the received communication mode (S42).
6). When communicating in multiple modes, the operations are performed in the order received.

In the following flow, if there is no description of the operation, it is assumed that there is no operation according to the communication mode.

FIG. 27 is a diagram showing the contents of body / lens identification communication. Data communication such as identification behavior is performed mutually (S531, S532).

FIG. 28 is a flow chart for obtaining a BL request. This is also a communication only. Referring to FIG. 28, signals such as AFM and RAFEN are output from the lens side (S541).

Next, the lens storage command will be described. FIG. 29A shows the contents of communication, and FIG. 29B shows the operation.

Referring to FIG. 29A, in the lens storage command, ISCMPT (BL request acquisition communication data) is set to 1 and the process returns (S551).

Regarding the operation in the lens storage command, FIG.
This will be described with reference to 9 (b). The drive of the focus lens 34 in the retracting direction is started (S561). When the shortest position (SLI ON) position is reached, the lens driving is stopped (S562, S563), ISCMPT is set to 1, and the process returns (S564). FST during lens retraction operation
When PL (memory for storing the input of the focus lens stop command) becomes 1, the subsequent lenses set FSTPL to 0 and return (S565, S5).
66).

FIG. 30 is a flow chart showing the contents of the lens mechanism initialization command. (A) shows the contents of communication,
(B) shows the operation. Referring to FIG. 30 (a), in communication, first, ISCMPT (BL request communication) is set to 0 and the process returns (S570).

The operation of the lens mechanism initialization command will be described with reference to FIG. First, ISCMPTL (memory for storing that the focus lens has been initialized) is set to 0 (S571). Focus lens 34
When the drive in the rewinding direction is started and SL1 is turned on, the remaining drive pulse "-5" is set in the focus drive control circuit 50 to let out 5 pulses (S5).
74). When the lens stops, ISCMPTL is set to 1 (S578). The lens calculates the distance based on the lens extension amount with reference to this position. When FSTPL (memory for storing the input of the focus lens stop command) becomes 1 during lens driving, subsequent lens driving is unnecessary, so FSTPL is set to 0 and driving of the focus lens 34 is stopped (S575). NO and S
576, S577).

Next, the diaphragm is driven toward the mechanical open value (S581). If FSTAV (memory for storing the input of the stop stop command) becomes 1 during lens driving, the subsequent lens driving is not necessary and FSTAV is set to 0.
Then, the diaphragm drive is stopped (S579, S580). If the aperture drive completion path IPCMPTL is 1, initialization is completed and IPCMPPT is set to 1 to end the initialization operation (S5).
84, S585).

FIG. 31 is a flow chart showing a low power consumption mode transition instruction. (A) shows the contents of communication,
(B) shows the operation. Referring to FIG. 31A, if the aperture is being driven or the focus lens is being driven, STBYEN
(Low power consumption mode transition command communication data) is set to 1 (YES in S591 and S592, S594). STBYE if neither aperture drive nor focus lens drive
N = 0 (NO in S591 and S592, S59
3). Then, PFWEN, SRAMK, and STBYEN are communicated with and the process returns (S595).

The operation of the low power consumption mode transition instruction will be described with reference to FIG. When STBYEN is 1, stop the focus lens 34 and stop the STB
YEN = 0 is set (S601 to S604). Then, in accordance with PFWEN and SRANK from the body, an activation condition from sleep is set as an interrupt condition and the device enters sleep (S6).
05-S608). It should be noted that here, if it is activated, it exits from sleep, and if an interrupt is made, it exits from sleep and an interrupt occurs and an interrupt processing routine is executed.

If an interrupt occurs due to CSL = "L" and it is activated (YES in S609), it is not necessary to activate the body, and the process directly returns (YE in S609).
S). When interrupted or activated due to other conditions, it is necessary to activate the body, so after CSL is dropped to "L" for 1 mSEC, the routine returns and waits for a communication request from the body in a normal routine (NO in S609). . Next, the interrupt rank will be described. Rank 1 is a state in which the switch S1 of the body is on and charging, and the main switch S0 is off. An interrupt is generated only by CSL. Therefore, basically, the body is not activated by the lens. However, this does not apply when the lens is reset and started due to some abnormality.

Rank 2 is a state where the body is being charged except when the switch S1 is on. An interrupt is generated by the CSL and the AF / MF selection switch SAF / MF.

Rank 3 corresponds to a body sleep other than the above. An interrupt is generated by the CSL and AF / MF selection switches, and the other switches are activated.

Next, the serial bus use permission processing will be described with reference to FIG. (A) shows the communication contents of serial bus use permission, and (b) is a flow of the operation when the serial bus use permission is given.

Referring to FIG. 32 (a), when the use of the serial bus is permitted, the process returns without doing anything.

Referring to FIG. 32 (b), when the serial bus use is permitted, if the body permits use of the serial communication, serial communication is performed with the E2PROM 21 using the serial bus (S702). . When the communication is completed, CSL is set to "L" for 1 mSEC and the process returns to wait for a communication request from the body (S703).

FIG. 33 is a flow chart showing the contents of communication for obtaining photometric data. Referring to FIG. 33, the aperture open switch SAV is input, and MEOK is issued depending on whether it is on or off.
Is set to 0 or 1 (S711 to S714). After that, the photometry-related data is input and the temperature-related data is input (S715). There is no corresponding action for this.

Next, acquisition of current aperture value data will be described. This is also communication only. With reference to FIG. 34, data relating to the aperture value is output (S721).

Next, the diaphragm drive command will be described with reference to FIG. (A) shows the contents of communication, (b) shows an operation. Referring to FIG. 35 (a), FINMVA = 0 is set and AVT is input (S731, S732).

Next, the operation will be described with reference to FIG. First, it is set that AVMV = 1 (both data is current aperture value acquisition communication data) (S741). The diaphragm drive is started (S742). When the target aperture value is reached, it is determined whether the SAV is changing (from ON to OFF). If not, there is an abnormality in the diaphragm drive mechanism.
Set (Aperture value acquisition / communication data) to 1 (Y in S743)
ES, NO in S744, S745, S746).

If the SAV has changed, it is determined that the diaphragm is operating normally, AVMV = 0 and FINMVA = 1, and the diaphragm operation ends (YES in S745, S748,
S749).

If FSTAV becomes 1 during aperture driving (YES in S750), the aperture driving command is issued from the body and the aperture driving is stopped. Therefore, FSTPAV = 0 is set and the aperture driving operation is ended (S751). ). The normality / abnormality detection of the diaphragm by the SAV is performed only when the diaphragm is narrowed down from the mechanical open position or when the mechanical open position is driven from the narrowed position.

Next, the stop stop command will be described. FIG.
FIG. 6A is a diagram showing the contents of communication of the stop stop command. Referring to FIG. 36 (a), the process directly returns.

Next, the operation of the stop stop command will be described with reference to FIG.
This will be described with reference to FIG. FSTPAV = 1 is set so that the diaphragm drive is stopped (the energization is also stopped) and the diaphragm drive is not performed again after the return (S771, S772). Further, since the driving is stopped, AVMV = 0 is set and the process returns (S773).

Acquisition of distance measurement data will be described below.
This is also a communication only. With reference to FIG. 37, information as to whether or not the lens speed during distance measurement is stable is input from the speed detection circuit 40, and is transmitted to the body together with other distance measurement related data (S781, S782).

Next, distance measurement synchronization will be described with reference to FIG. (A) shows the contents of communication, (b) shows an operation. With reference to FIG. 38A, it is determined whether or not the speed detection circuit 40 and the current lens speed are stable (S7).
91), if it is stable, the speed detection circuit 40 is instructed to start the measurement period, and the distance measurement integration time lag is input.
Send LSTAB0 = 1 to the body (S792 to S7
94). Then, the input time lag is set in the timer and the process returns (S795).

The distance measuring synchronization operation will be described with reference to FIG. When the time lag has elapsed, the focal length and focus lens position at the center of the distance measurement period are stored (S801 to S803).

Next, the focus lens drive state acquisition will be described. This is also a communication only. Referring to FIG. 39, data regarding the focus lens driving state is output to the body (S811).

Next, the focus lens drive command will be described with reference to FIG. (A) shows the contents of communication,
(B) shows the operation. Referring to FIG. 40 (a), the FIN
MVL (focus lens drive status acquisition communication data)
= 0, and data regarding lens driving is input (S8).
21, S822).

Next, the operation of the focus lens drive command will be described with reference to FIG. When the lens is not being driven, the drive direction is determined from the input drive amount, and if it is not the end on the drive direction side, the remaining drive amount is set (NO in S831, S843, S844). Also FLE
ND = 0 is set (S845). If it is the end, the remaining drive amount is set to 0 (S847, S848). FLEND =
Let it be 1.

When the movement amount is corrected, the drive amount is corrected by the lens position at the center of the distance measuring period and the current lens position (YES in S831, S832, S833). Next, it is determined whether the target position of the lens is on the opposite side of the current lens driving direction, that is, it is necessary to reverse the motor (S8).
34). If it is not in the reverse direction, the distance to the target position is set as the remaining drive amount unless it is the end on the drive direction side that determines the drive amount and drive direction (S834, S843-).
S846). Set FLEND = 0. At the end, the remaining drive amount is set to 0. Further, FLEND = 0 is set (S84
7, S848).

If it is on the side opposite to the driving direction, it is determined whether or not automatic reversal processing is performed (S835). When it is not present, the remaining drive amount is set to 0 (S842), and when it is present, the distance to the target is set as the remaining drive amount (S836 to S84).
1). After performing the above processing, FINMVL = 1 is set (S849).

Next, the focus lens stop command will be described. This is also a communication only. Referring to FIG. 41, the lens drive is stopped by setting the remaining drive amount to 0, and FS
TPL = 0 and FLMV = 0 (S851 to S85)
3).

Next, the AF / M switching instruction will be described with reference to FIG. This is also a communication only. FIG.
With reference to, the AF instruction / MF instruction is switched (S8
54-S856).

Next, the PF drive permission will be described with reference to FIG. (A) shows communication contents, (b) shows operation contents.

Referring to FIG. 43 (a), in communication, the process directly returns. The operation will be described with reference to FIG. First, the states of SPFN and SPFF are input, and the focus lens 34 is driven to the far side or the near side in each data (S871, S880, S).
881). When the terminal end is reached or FSTPL becomes 1, driving is stopped (S882-S888). FLMV = 1 while the lens is being driven, and FLMV = 0 after the lens is stopped. FLEND = 0 except at the end of the lens, FLE at the end
Let ND = 1. If no PF operation is performed for 5 seconds or more, the process returns. This is to prevent frequent communication of PF requests for small PF operations (S889, S).
890).

Next, the infinite set instruction will be described with reference to FIG. (A) shows the contents of communication, (b) shows an operation. Referring to FIG. 44A, FINMVL (focus lens drive state acquisition communication data) = 0 is set (S891).

Next, the operation of the infinite set instruction will be described with reference to FIG. Set FLMV = 1 (S90
1), drive the lens to the far end (SL1 ON) (S902 to S903). When turned on, it returns 5 pulses (S
904). When the lens stops, FMLV = 0, FINM
VL = 1 is set (S905 to S907). If FSTPL = 1 while driving the lens, the infinite set is interrupted (S
908-S911).

Next, the no-operation will be described with reference to FIG. Referring to FIG. 45, nothing is particularly performed in communication.

Next, power supply (PWRSPL) will be described with reference to FIG. (A) shows communication contents, (b) shows operation contents. Referring to FIG. 46 (a), the communication returns without doing anything.

Referring to FIG. 46 (b), in the operation, the signal indicating that the power supply is in use is first set to 1, a predetermined operation is performed, and the operation is reset after the operation is completed (S931 to S933).

Next, with reference to FIG. 47, power supply use prohibition (PWSTP) will be described. (A) shows the contents of communication, (b) shows an operation. Referring to FIG. 47 (a),
The communication returns without doing anything.

Referring to FIG. 47 (b), in the operation, the predetermined operation is stopped (S941), the diaphragm is stopped similarly to the low power consumption mode, and the driving of the focus lens is stopped (S94).
2) Reset the signal indicating that the power supply is in use (S943).

Next, the photometric subroutine will be described with reference to FIG. First, "GETED" communication is performed (S
951), various information for photometry is input from the lens. Then, five photometric data (center, peripheral areas 1 to 4, see FIG. 49) are input from the photometric circuit (S952). This photometric data is the output data itself of the photometric element. When the open metering is possible (the lens diaphragm is open), the brightness data of each of the above five metering data is obtained using the metering open diaphragm value input from the lens (S9).
53, S954).

When the open metering is impossible (the state where the aperture of the lens is narrowed due to a preview, a lens aperture failure, etc.), GETAV communication is performed with the lens and the current aperture value information is input (S955, S956). Using the input aperture value, each brightness data is obtained from the above photometric data.

Next, it is determined whether or not multi-division / spot photometry is possible (S957), and if multi-division / spot photometry is not possible, addition is performed according to each weighting of the brightness data, and averaged to obtain control brightness data. Yes (average photometry) (S961).
When multi-division / spot photometry is possible, it is determined whether or not the spot photometry mode is selected by the photometry mode selection means (not shown) (S958). In the spot metering mode, the brightness data in the central portion is set as normal brightness data (spot metering) (S960).

If it is not the spot metering mode, the weighting of each luminance data is appropriately determined according to the value of each luminance data, the luminance distribution, etc., added, and averaged to obtain the control luminance data (multi-division metering) ( S959).

When the general-purpose intermediate accessory is attached, the lens-side microcomputer divides the photographic screen into a plurality of parts for photometric measurement, determines the weighting of the photometric value of each part according to the photographic scene, and performs photographic Shooting is prohibited in the metering mode that calculates the data related to the exposure. Therefore,
When a general-purpose intermediate accessory is attached, photometric FNO, multi-segment photometry with large photometric error sensitivity to the lens pupil position,
Since exposure by the mode by spot metering can be prohibited, it is possible to prohibit shooting with a large exposure error when a general-purpose intermediate accessory is attached.

Next, returning to the flow, if the result of the photometric calculation is that flash is required at low brightness, TV and AV are determined from the program line for flash (when unnecessary, TV and AV are determined from the program line for natural light. Do)
(S962). Then, it is determined from the FMEN data of the GETED communication whether or not the flash control by the FM is possible (S962, S964).

If FM is possible, the flash guide number is calculated from the subject distance and the aperture value (AV), and the guide number data is sent to the flash unit (S96).
5, S966). When the flash receives an issuing signal at the time of shooting, the flash is issued with GNo.

If FM is not possible, data indicating that the issuance amount control is performed by light adjustment is transmitted to the flash unit (S968). The flash starts emitting light when it receives a light emitting signal during shooting, and stops emitting light in response to a stop signal from the dimming circuit.

When the lens determines that the exposure by the flashmatic cannot be performed normally due to the reason that the accurate subject distance cannot be obtained because the general-purpose intermediate ACC is attached, the flashmatic control disable signal is sent to the body. By transmitting, it becomes possible to prevent an exposure defect due to flashmatic control.

AF calculation will be described below with reference to FIG. When performing the AF calculation, it is determined whether or not the DVP reference of the mounted lens is ∞ (S971), and if it is ∞, the AF calculation is performed under the condition that there is a moving body determination (S9).
72). If it is not ∞, AF calculation is performed without performing moving object determination (S973).

Here, the DVP standard is a point serving as a standard for lens extension. Normally, it is set to the infinity position, but in the case of a macro lens, there is no infinity position, so a specific distance is the reference for extension. In the body, the focus lens performs a predetermined calculation based on the amount of extension from the DVP reference (∞ position) to obtain the subject distance. However, this calculation is performed when the DVP reference is at the infinity position, and D
When the VP reference is not ∞, the subject distance cannot be obtained even if the above calculation is performed.

Next, the moving body determination will be described. It is to detect the movement of the subject by the change of the subject distance at the time of the last distance measurement and the subject distance at the time of the current distance measurement. When it is determined that the subject is moving, the previous distance, the current distance,
The subject distance of the patent at the time of exposure is predicted by the time until the last distance measurement and the current distance measurement, and the time until the exposure, and the lens is driven toward that position.

The microcomputer on the lens side transmits to the body side whether or not the reference position for feeding the lens is the optical infinity position. Therefore, if the body side is not at the optical infinity position, the moving body determination is prohibited so that the wrong predicted distance is obtained. It is possible to prevent the shooting from being performed. As a result, it is possible to prevent erroneous operation due to the difference in the lens feeding reference points. In addition, in the case of a macro dedicated lens whose lens reference position is not an optical infinity position, most of the time, a still object is photographed, and there is very little need to make a motion determination, so there is no need to make a motion determination. It does not become.

FIG. 51 is a schematic view showing the opening correction cam. 10A is an enlarged view of a portion of the cam plate 76 shown in FIG. 10, and FIG. 9B is an enlarged view of the groove 87.

With reference to FIG. 51 (a), a correction area 91 is provided in the groove 87 in the vicinity of the mechanical open position 90 opposite to the narrowed position 89, whereby the diaphragm can be controlled more finely. . That is, in the normal region, 1/4 Ev for each step of the stepping motor
While the aperture value changes only by this, in the correction area 91, control of 1/8 Ev is possible. This state will be described with reference to FIG.

FIG. 52 is a diagram showing an AVSFSHIFT signal when the open correction cam 83 is used and the state of the diaphragm at that time. Referring to FIG. 52, the left side is the wide end and the right side is the tele end. Now, let's consider a case where a lens with different aperture resolutions is attached when energized and not energized. When the shutter speed exceeds 4 seconds, the aperture value is determined so that the aperture stays at a stable point when not energized.
Whether or not it is a stable point in a normal lens can be determined by whether or not the difference from the shooting aperture value sent from the lens by the lens is a multiple of the resolution when no current is applied. Opening correction cam 83
By using, the aperture value at the point where the difference between the shooting open aperture value and the shooting open aperture value is not a multiple of the resolution of the non-energized value can be set as a stable point during non-energized.

In the figure, black circles are energized points, and white circles are non-energized points. By using the opening correction cam 83, stable points that are normally taken at 1/4 Ev intervals can be taken in 1/8 Ev steps as shown by the solid line in the figure.

Next, the intermediate accessory will be described.
FIG. 53 is a diagram showing a state in which the intermediate accessory 6 is provided between the lens 7 and the body 5. Intermediate accessory 6
Is provided with a data processing circuit 101 connected to the serial bus line SOUT.
It operates according to the signals of L and SCK.

FIG. 54 shows a specific circuit example (a) of the data processing circuit 101 and an output signal (b) of the serial bus line.
FIG. Referring to FIG. 54 (a), data processing circuit 101 includes counter 102 that receives signals CSL and SCK, flip-flop circuit 103 that receives the signal from counter 102 and CSL, and P / S that inputs signals CSL and SCK. It includes a circuit 104, an AND circuit 105 connected to the flip-flop 103 and the P / S circuit 104, and an OR circuit 106 which inputs the AND circuit 105 and SOUT and outputs an output signal.

Referring to (b), the output of the P / S circuit is ORed with the data at the time of a plurality of falling edges (x in the figure) of signal SOUT. The P / S circuit 104 outputs 00 according to the input signal.
Set 010000.

Next, the operation will be described. Counter 10
2 outputs "L" while CCK is "L" and SCK outputs 8 pulses, and thereafter outputs "H". The flip-flop 103 is set by "L" of CSL and reset by "H" of the output of the counter 102. When both terminals S and R are "H", reset is prioritized.

The P / S circuit serially outputs 1-byte data set in parallel in synchronization with the SCK pulse when CSL is "L". The AND gate 105 outputs the output of the flip-flop 103 and P /
The output of the S circuit 104 is input. Therefore, the AND gate 105 operates SC after CSL changes from “H” to “L”.
P / S data is serially output for K8 pulses (1 byte). The OR gate ORs the output and outputs it to SOUT.

FIG. 55 is a diagram showing a circuit example of data processing of the dedicated teleconverter. Other than the broken line portion in the figure, the circuit example of the data processing of the general-purpose intermediate accessory shown in FIG. 54 is the same. Referring to FIG. 55, the data from P / S circuit 104 and the data of SOUT are added by full adder 107. The carry data is delayed by one pulse in the delay circuit 108 and added to the data of the next bit.

FIG. 56 is a diagram showing the specific contents of the intermediate accessory detection by the communication header. (A) shows how the body side microcomputer 10 is processed by the above data processing.
FIG. 3 is a schematic diagram showing whether data is transferred from the lens microcomputer 30 to the lens side microcomputer 30, and FIG. 6B is a diagram showing specific contents of the data.

Referring to FIG. 56 (a), body side microcomputer 10 sends 10000000 data as HEB. On the other hand, when the intermediate accessory 6 is not provided, the data is directly input to the lens side microcomputer 30 without being processed. When a dedicated teleconverter is provided as an intermediate accessory, the data of 00100001 is added, and as a result, 10100001 is input as input data to the lens side microcomputer 30.

[0233] When two dedicated teleconverters are installed,
The above-mentioned 00100001 is added twice. As a result, the data 11000010 is given to the lens side microcomputer 30.
Is input to

As shown in FIG. 56 (b), the lens side is judged to be normal if the values of the 7th bit and the 6th bit are 10, and is judged to be abnormal except 10. Considering this, when two dedicated teleconverters are connected in this way, the seventh bit and the sixth bit are represented as 11, and it is determined that there is an abnormality. This determination is made because two dedicated teleconverters are optically deteriorated.

Next, when a general-purpose teleconverter (for example, an intermediate ring) is provided as the intermediate accessory 6, the data 00010000 is ORed. As a result, the data 10010000 is input to the lens side microcomputer 30. Similarly, when a dedicated teleconverter and a general-purpose teleconverter are added, the data 00100001 is added and the data 0010000 is ORed. As a result, the data 10110001 is input to the lens side microcomputer 30. In this case, the signal ICPB is determined to be normal, but it is determined to be abnormal due to the mixed load of the general-purpose intermediate accessory and the dedicated teleconverter. In response to these abnormalities, the lens instructs the body to prohibit release by the REN signal.

Next, electronic correction of the diaphragm aperture diameter linked with zoom in BL communication will be described. In many zoom lenses, in order to cut flare (aberration) and adjust the F number, it is necessary to change the aperture diameter of the diaphragm according to zooming. Changing the aperture opening diameter in accordance with this zooming is called “aperture aperture diameter correction”. In the past, this aperture diameter correction was performed mechanically.

Normally (during open metering other than during release / preview, etc.), the maximum aperture remains unchanged and mechanical correction is not performed. Therefore, depending on the zooming state, the F number may be brighter than the originally designed F number of the optical design. This will be described with reference to FIG. FIG. 57 is a schematic diagram showing a schematic configuration of a diaphragm portion of a lens. Fig. 57
Referring to, the diaphragm blade 75 is provided in front of the lens 110, and the light shielding plate 111 is provided behind it. The relationship among the mechanical open F number, the open photometry F number, and the shooting open F number in this state is shown. The mechanical opening position corresponding to the mechanical opening F number is represented by m in the figure. On the other hand, at the time of shooting, it is necessary to narrow down to the part of n in the drawing corresponding to the shooting open F number. Conventionally, the values of these three F numbers are the same, and the diaphragm has been mechanically adjusted.

On the other hand, in the camera to which the present invention is applied, the diaphragm is electronically stopped only at the time of shooting, and otherwise the mechanical open F number is held. In the camera to which the present invention is applied, the diaphragm actuator is provided directly on the diaphragm block in terms of the configuration, and therefore there is no component for providing a cam mechanism for diaphragm correction unlike the related art. Therefore, in order to mechanically correct the aperture diameter, unlike the conventional method, it is necessary to make the correction mechanism at high cost. On the other hand, by adopting the electronic correction system, it is possible to prevent cost increase.

Next, FIG. 5 shows the movement correction in AF.
8 will be described. FIG. 58 is a diagram showing the image plane position in the case where the time is taken in the x-axis direction and the image plane position where the lens is connected is taken in the y-axis direction. Further, below the x-axis, the respective operations on the body side and the lens side are shown. In the figure, I represents the integral, D represents the data dump, and ALG represents the operation of the algorithm.

First, the procedure of distance measurement will be described. The body performs distance measurement synchronization prior to distance measurement. Notify the lens of the start of distance measurement by communication. After the elapse of the specified distance measurement integration time lag (DELAY), the lens stores the lens position and starts calculation of distance measurement data (ΔSB, K value, etc.). Here, ΔSB represents the sensor back, and represents the difference between the AFDF and the true DF.

After completion of the distance measurement integration on the body side, the distance measurement data is fetched by the distance measurement data acquisition (GETAD) communication.
After the ALG is completed, the body sends a drive amount (≈detection DF) to the focus lens 34 by a drive command (MOVL) communication. When the movement correction is instructed, the lens is driven by calculating the actual drive amount (≈remaining DF) from the position () of the storage lens corresponding to I1 and the target drive amount (TDVP) of the focus lens that has been sent. . Where I, D, A
The lens corrects the drive amount that moved during the time required for LG.
On the other hand, when the movement amount correction is not instructed, the lens is driven relative to the lens position at time point.

FIG. 59 shows the lens-side microcomputer 3 shown in FIG.
It is a figure which shows other embodiment around 0. Referring to FIG. 59, in this embodiment, voltage VP applied from the body side through power transistor PTR is sent to lens side microcomputer 30 and diaphragm drive circuit 31 via constant voltage circuit 120. The voltage VP is directly applied to the motor drive circuit 56.

By using the constant voltage circuit in this way, the stepping motor STM is driven by controlling the supply voltage to a predetermined value (lower limit fluctuation value) in a range in which the diaphragm driving voltage fluctuates. It is possible to prevent out-of-step due to fluctuations in power supply voltage. Further, heat generation of the actuator can be prevented, and the size can be reduced.

As such a regulator,
It goes without saying that the same effect can be obtained by providing a constant current circuit as well as the constant voltage circuit.

In this embodiment, the voltage VP is directly applied to the focus drive control circuit, but this is because it is a closed loop. Also in this case, like the diaphragm, an open loop may be used to apply a predetermined voltage via a constant voltage circuit.

Next, the reason why step out occurs in the stepping motor for driving the diaphragm will be described. FIG. 60 is a diagram showing the relationship between pulse speed and torque. a1 shows a curve at the time of movement when the voltage is large (for example, 6 V · 5 gcm), and a2 shows a relationship between states when the vehicle starts moving from a stopped state. a3 is a diagram corresponding to a1 when the voltage is small (for example, 2 V · 3 gcm), and a4 is a curve corresponding to a2 at that time. Referring to FIG. 60, when the diaphragm is driven by the voltage of a1, for example, if the voltage drops to a3, the torque may decrease and the diaphragm may not move as shown in the figure. In contrast,
It is considered that the lens side microcomputer 30 that is controlling is driving the diaphragm. As a result, the control value of the microcomputer and the position of the diaphragm do not match and open loop control becomes impossible. Such a state is called step out.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a control unit of a camera to which the present invention is applied.

FIG. 2 is a block diagram showing the contents of a speed detection circuit.

FIG. 3 is a block diagram showing the contents of a focus drive control circuit.

FIG. 4 is a diagram showing signals exchanged between a body side and a lens side.

FIG. 5 is a diagram showing signals exchanged between the body side and the lens side.

FIG. 6 is a diagram showing signals exchanged between the body side and the lens side.

FIG. 7 is a diagram showing signals exchanged between the body side and the lens side.

FIG. 8 is a diagram showing a main part on the body side.

FIG. 9 is a sectional view of a lens.

FIG. 10 is a schematic diagram showing a configuration of a diaphragm.

FIG. 11 is a flowchart showing BL communication contents.

FIG. 12 is a flowchart showing processing on the body side.

FIG. 13 is a flowchart showing a BL request acquisition routine.

FIG. 14 is a flowchart showing the contents of a P reset routine.

FIG. 15 is a flowchart showing the contents of S0 off processing.

FIG. 16 is a flowchart showing S0 ON processing content.

FIG. 17 is a flowchart showing the contents of S1 ON processing.

FIG. 18 is a flowchart showing the contents of S1 ON processing.

FIG. 19 is a flowchart showing the contents of S2 ON processing.

FIG. 20 is a flowchart showing the contents of serial bus release processing.

FIG. 21 is a flowchart showing the contents of a power supply process.

FIG. 22 is a flowchart showing the contents of mechanical reset processing.

FIG. 23 is a flowchart showing the contents of lens contact communication.

FIG. 24 is a flowchart showing processing details on the lens side.

FIG. 25 is a flowchart showing the contents of a HEB routine.

FIG. 26 is a flowchart showing interrupt processing contents.

FIG. 27 is a flowchart showing the contents of body lens identification processing.

FIG. 28 is a flowchart showing the contents of a BL request acquisition process.

FIG. 29 is a flowchart showing the details of lens storage command processing.

FIG. 30 is a flowchart showing the processing contents of a lens mechanism initialization command.

FIG. 31 is a flowchart showing the contents of a low power consumption mode transition command.

FIG. 32 is a flowchart showing the contents of permission to use the serial bus.

FIG. 33 is a flowchart showing the details of photometric data acquisition processing.

FIG. 34 is a flowchart showing the contents of a current aperture value data acquisition process.

FIG. 35 is a flowchart showing the details of aperture drive command processing.

FIG. 36 is a flowchart showing the processing contents of a stop stop command.

FIG. 37 is a flowchart showing the contents of distance measurement data acquisition processing.

FIG. 38 is a flowchart showing the contents of distance measurement synchronization processing.

FIG. 39 is a flowchart showing the contents of focus lens drive state acquisition processing.

FIG. 40 is a flowchart showing the contents of focus lens drive command processing.

FIG. 41 is a flowchart showing the contents of focus lens stop command processing.

FIG. 42 is a flowchart showing the contents of AF / M switching command processing.

FIG. 43 is a flowchart showing the contents of a PF drive permission process.

FIG. 44 is a flowchart showing the contents of infinite set command processing.

FIG. 45 is a flowchart showing the contents of NOP processing.

FIG. 46 is a flowchart showing the contents of a power supply process.

FIG. 47 is a flowchart showing the contents of a power supply use prohibition process.

FIG. 48 is a flowchart showing the details of photometric processing.

FIG. 49 is a diagram showing an arrangement of photometric elements on a shooting screen.

FIG. 50 is a flowchart showing the contents of AF calculation processing.

FIG. 51 is a view showing an opening correction cam.

FIG. 52 is a diagram showing a relationship between an AVSHIFT signal and an aperture value.

FIG. 53 is a diagram showing a connection state of intermediate accessories.

FIG. 54 is a diagram showing an example of a data processing circuit of a general-purpose intermediate accessory.

[Fig. 55] Fig. 55 is a diagram illustrating a circuit example of data processing of a dedicated teleconverter.

FIG. 56 is a diagram showing a method of detecting an intermediate accessory using a communication header.

FIG. 57 is a diagram for explaining electronic correction of a diaphragm aperture diameter associated with zooming.

FIG. 58 is a diagram for explaining movement amount correction in AF.

FIG. 59 is a diagram showing another embodiment around a lens side microcomputer.

FIG. 60 is a diagram showing the reason why step out occurs in a stepping motor.

[Explanation of symbols]

 5 Body 6 Intermediate Accessories 7 Lens 8 Aperture 10 Body Side Microcomputer 11 Photometry Circuit 12 Distance Measuring Circuit 13 Auxiliary Light Output Circuit 14 Light Control Circuit 15 Flash 16 Exposure Circuit 17 DC / DC Converter 20 Data Back 21 E2PROM 30 Lens Side Microcomputer 31 Aperture Control circuit 32 Focal length detection circuit 33 Motor 34 Focus lens 40 Speed detection circuit 41 Pulse interval measurement circuit 50 Focus drive control circuit 51 Lens position counter 52 Up-down determination circuit 53 Drive remaining pulse counter 54 Motor drive direction determination circuit 55 Drive required Rejection determination circuit 56 Motor drive circuit 61 Shutter button 62 Built-in flash 63 Accessory shoe 64 Self-timer / remote control operation indicator lamp 65 Remote control receiver 66 Lens removal button 67 Diopter adjustment dial 68 Film chamber 69 Lens index

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G03B 15/05 G03B 3/00 A

Claims (1)

[Claims] 1. A camera in which a lens is interchangeable with respect to a body, the body-side microcomputer provided on the body side for controlling operation of the camera, and the lens side provided on the lens side for controlling operation on the lens side. The microcomputer includes a microcomputer, the body side includes a distance measuring unit for measuring a subject distance, a light projecting unit for projecting auxiliary light toward the subject when the distance measurement is impossible, and the lens of the lens. A determining means for determining the type, and a prohibiting means for prohibiting the projection of the auxiliary light in accordance with the result of the determination by the determining means, and the lens side prohibits the projection of the auxiliary light. Including a transmitting means for transmitting the data of the above to the body side microcomputer,
A camera with interchangeable lenses.