JP2020030402A - interchangeable lens - Google Patents

Abstract

To transmit information from an interchangeable lens to a camera body appropriately.SOLUTION: An interchangeable lens removably attachable to a camera body includes: a first clock receiving unit that receives a first clock from the camera body; a second clock transmitting unit that transmits a second clock to the camera body; a lens driven by receiving a driving force from a first driving member; a diaphragm member driven by receiving a driving force from a second driving member; a receiving unit that receives from the camera body an instruction synchronized with the first clock; a first transmitting unit that periodically transmits, to the camera body, positional information on the lens in synchronization with the second clock; and a second transmitting unit that transmits to the camera body a state of the diaphragm member on the basis of the instruction in synchronization with the first clock.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an interchangeable lens.

  There is known a technique for transmitting information indicating the state of an interchangeable lens to a camera body (see Patent Document 1). Conventionally, it has been necessary to send information appropriately.

JP 2000-105402 A

  An interchangeable lens according to a first aspect of the present invention is an interchangeable lens that is detachable from a camera body, and includes a first clock receiving unit that receives a first clock from the camera body, and a second clock that transmits a second clock to the camera body. A two-clock transmitting unit, a lens driven by receiving a driving force from the first driving member, an aperture member driven by receiving a driving force from the second driving member, and an instruction synchronized with the first clock from the camera body. A receiving unit for receiving, a first transmitting unit for periodically transmitting the position information of the lens to the camera body in synchronization with the second clock, and synchronizing the state of the aperture member with the first clock based on an instruction to the camera body And a second transmission unit that transmits the data.

It is a perspective view which illustrates a camera system. FIG. 2 is a block diagram illustrating a main configuration of the camera system. FIG. 3 is a circuit diagram schematically illustrating an electrical connection between a camera body and an interchangeable lens. 6 is a timing chart illustrating command data communication and hot line communication. FIG. 5 is a diagram illustrating timing of command data communication. FIG. 3 is a diagram illustrating timing of hotline communication. FIG. 4 is a diagram illustrating information included in hotline data. FIG. 3 is a diagram illustrating a relationship between a focusing lens position, a focal length, and a shooting distance. FIG. 4 is a diagram illustrating information included in hotline data. FIG. 3 is a diagram illustrating timing of automatic focus adjustment. It is a figure which illustrates the timing of an image stabilization operation. FIG. 12A is a diagram exemplifying the movement trajectories of a plurality of focusing lenses, and FIG. 12B is a diagram illustrating a case where the movement trajectory when priority is given to optical performance partially coincides with the movement trajectory when speed is prioritized. FIG.

Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a camera system 1 before an interchangeable lens 3 is mounted on a camera body 2 according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a main configuration of the camera system 1. The coupling between the camera body 2 and the interchangeable lens 3 is performed by a bayonet structure of the body-side mount 210 and the lens-side mount 310. When the camera body 2 and the interchangeable lens 3 are coupled, the terminals provided on the body-side mount and the terminals provided on the lens-side mount are in physical contact with each other and are electrically connected. 1, the optical axis O of the interchangeable lens 3 and the X-axis direction and the Y-axis direction in a plane intersecting the optical axis O are indicated by arrows.

<Camera body>
The camera body 2 includes a body-side mount 210, a body-side control unit 230, a body-side communication unit 240, a power supply unit 250, an image sensor 260, a sensor driving unit 265, a signal processing unit 270, an operation member 280, a display unit 285, and a shake. It has a sensor 290.

  An annular body-side mount 210 is provided with a body-side terminal holding portion 220 (FIG. 3). The body-side terminal holding section 220 has a plurality of body-side terminals. The plurality of body-side terminals are, for example, an attachment detection terminal that transmits a signal indicating that the interchangeable lens 3 is attached to the camera body 2 to the camera body 2, and are used for communication between the camera body 2 and the interchangeable lens 3. Communication terminal, a power supply terminal for supplying power from the camera body 2 to the interchangeable lens 3, and a ground terminal.

The body-side control unit 230 includes a microcomputer and its peripheral circuits. The body-side control unit 230 executes a control program stored in the storage unit 235 to control each unit in the camera body 2. The body-side control unit 230 includes a body-side communication unit 240, a power supply unit 250, an image sensor 260, a sensor driving unit 265, a signal processing unit 270, an operation member 280, a display unit 285, a shake sensor 290, and the above-described attachment detection terminals. Connected.
The body-side control unit 230 includes a storage unit 235. Recording and reading of data in the storage unit 235 are controlled by the body-side control unit 230. The storage unit 235 stores a control program executed by the body-side control unit 230 and the like.
The body-side control unit 230 includes a body-side first control unit 230a and a body-side second control unit 230b. The body-side first control unit 230a controls the entire camera body 2 such as image processing and creates an instruction for a moving member included in the interchangeable lens 3, and the body-side second control unit 230b controls the shake sensor 290 and the sensor drive. It is connected to the section 265 and mainly controls a shake correction operation in the camera body 2. Since the body-side second control section 230b mainly controls the sensor driving section 265, control relating to shake correction can be performed quickly. The first body-side control unit 230a transmits an instruction relating to shake correction such as the start of shake correction to the second body-side control unit 230b. Between the body-side first control unit 230a and the body-side second control unit 230b, mutually necessary data and instructions are appropriately transmitted and received.

The body-side communication section 240 performs predetermined communication with the lens-side communication section 340. The body-side communication unit 240 is connected to the communication terminal described above, and transmits a signal to the body-side control unit 230. The body side communication section 240 includes a body side first communication section 240a and a body side second communication section 240b. The body-side first communication unit 240a is connected to a terminal for performing command data communication described later, and the body-side second communication unit 240b is connected to a terminal for performing hotline communication described later.
The body-side first communication unit 240a is connected to the body-side first control unit 230a, and information transmitted from the camera body 2 to the interchangeable lens 3 by command data communication is created by the body-side first control unit 230a. The body-side second communication unit 240b is connected to the body-side first control unit 230a and the body-side second control unit 230b. This is transmitted to the unit 230a and the second body-side control unit 230b.

  The power supply unit 250 converts a voltage of a battery (not shown) into a voltage used in each unit of the camera system 1 and supplies the voltage to each unit of the camera body 2 and the interchangeable lens 3. The power supply unit 250 can switch on and off power supply for each power supply destination according to an instruction from the body-side control unit 230. The power supply unit 250 is connected to the above-described power supply terminal.

The image sensor 260 is a solid-state image sensor such as a CMOS image sensor or a CCD image sensor. The imaging element 260 photoelectrically converts the subject image on the imaging surface 260S according to a control signal from the body-side control unit 230 and outputs a signal.
The imaging element 260 has a photoelectric conversion unit for generating an image and a photoelectric conversion unit for focus detection. The imaging pixel signal generated by the image generation photoelectric conversion unit is used by the signal processing unit 270 to generate image data. The pixel signal for detection generated by the photoelectric conversion unit for focus detection is used by the signal processing unit 270 for focus detection processing for detecting the image formation state of the interchangeable lens 3, in other words, the focus of the interchangeable lens 3.

  The signal processing unit 270 performs predetermined image processing on the imaging pixel signal output from the imaging element 260 to generate image data. The generated image data is recorded on a storage medium (not shown) in a predetermined file format, or used for image display by the display unit 285. In addition, the signal processing unit 270 performs a predetermined focus detection process on the detection pixel signal output from the image sensor 260 to calculate a defocus amount. The signal processing unit 270 is connected to the body-side control unit 230, the image sensor 260, and the display unit 285.

The shake sensor 290 detects shake of the camera body 2 due to hand shake or the like. The shake sensor 290 includes an angular velocity sensor 290a and an acceleration sensor 290b. The shake sensor 290 detects angular shake and translational shake separately for an X-axis direction component and a Y-axis direction component. The angular velocity sensor 290a also detects a rotation (roll) component around the optical axis O.
The angular velocity sensor 290a detects an angular velocity generated by the rotational movement of the camera body 2. The angular velocity sensor 290a detects rotation about each of an axis parallel to the X axis, an axis parallel to the Y axis, and an axis parallel to the optical axis O, for example, and detects a detection signal in the X axis direction and a detection signal in the Y axis direction. The signal and the rotation signal about the optical axis O are output to the second body-side control unit 230b.
Further, the acceleration sensor 290b detects an acceleration generated by the translation movement of the camera body 2. The acceleration sensor 290b detects, for example, an acceleration in an axis parallel to the X-axis and an acceleration in an axis parallel to the Y-axis, and outputs a detection signal in the X-axis direction and a detection signal in the Y-axis direction to the body-side second control unit 230b. Output.
Each of the angular velocity sensor 290a and the acceleration sensor 290b can periodically output a detection signal at a cycle shorter than the cycle of the hot line communication.

  The sensor driving unit 265 includes, for example, an actuator and a driving mechanism. The sensor driving unit 265 moves the image sensor 260 in a plane that intersects the optical axis O based on an instruction output from the second body-side control unit 230b. By moving the image sensor 260 in a plane that intersects the optical axis O, the shake (image shake) of the subject image on the image pickup surface 260S of the image sensor 260 is suppressed. The sensor driving section 265 also includes a Hall element for detecting the position of the image sensor 260 in a direction intersecting with the optical axis O.

An operation member 280 including a release button, an operation switch, and the like is provided on an exterior surface of the camera body 2. By operating the operation member 280, the user issues a shooting instruction, a shooting condition setting instruction, and the like. The operation member 280 sends an operation signal according to a user's operation to the body-side control unit 230.
The display unit 285 is configured by, for example, a liquid crystal display panel. The display unit 285 displays an image based on the image data processed by the signal processing unit 270, an operation menu screen, and the like according to an instruction from the body-side control unit 230.

<Interchangeable lens>
The interchangeable lens 3 includes a lens-side mount 310, a lens-side control unit 330, a lens-side communication unit 340, a lens-side storage unit 350, an imaging optical system 360, a lens drive unit 370, a zoom operation ring 375, an aperture drive unit 380, and shake. It has a sensor 390.

  An annular lens-side mount 310 is provided with a lens-side terminal holding section 320 (FIG. 3). The lens-side terminal holding section 320 has a plurality of lens-side terminals in an arc shape centered on the optical axis O. As shown in FIG. 3, the plurality of lens-side terminals include an attachment detection terminal for transmitting a signal indicating that the interchangeable lens 3 is attached to the camera body 2 to the camera body 2, and a connection between the interchangeable lens 3 and the camera body 2. , A power supply terminal for supplying power from the camera body 2 to the interchangeable lens 3, and a ground terminal.

  The lens-side controller 330 includes a microcomputer and its peripheral circuits. The lens-side control unit 330 controls each unit of the interchangeable lens 3 by executing a control program stored in the lens-side storage unit 350. The lens-side control unit 330 is directly or indirectly connected to the lens-side communication unit 340, the lens-side storage unit 350, the lens drive unit 370, the zoom operation ring 375, the aperture drive unit 380, and the shake sensor 390.

  The lens-side storage unit 350 is configured by a nonvolatile storage medium. Recording and reading of data in the lens side storage unit 350 are controlled by the lens side control unit 330. The lens-side storage unit 350 stores data indicating the model name of the interchangeable lens 3, data indicating the optical characteristics of the imaging optical system 360, and the like, in addition to storing a control program and the like executed by the lens-side control unit 330. Can be. Examples of the optical characteristics include a vibration reduction coefficient according to the focal length and the shooting distance, a position of the focusing lens 361a in the optical axis O direction according to the focal length and the shooting distance, and the like.

The imaging optical system 360 forms a subject image on an imaging surface (imaging surface 260S). The optical axis O of the imaging optical system 360 substantially coincides with the center position of the lens-side mount 310, the body-side mount 210, and the imaging surface 260S. At least a part of the imaging optical system 360 is configured to be movable as a movable member in the interchangeable lens 3.
The imaging optical system 360 includes, for example, a focusing lens 361a as a moving member, a shake correction lens 361b as a moving member, a zoom lens 361c as a moving member, and a diaphragm member 362. These members may be called driven members.
The lens driving section 370 moves each moving member, and includes lens driving sections 370a, 370b, and 370c. Each of the lens driving units 370 includes an actuator, a driving mechanism, and a position detecting unit of a moving member. In the present embodiment, the position information of each moving member is periodically created by the lens-side control unit 330 based on signals from the position detection unit of the lens driving unit 370 and the actuator. In addition, based on signals from the position detection unit and the actuator of the lens driving unit 370, the lens-side control unit 330 determines whether or not the moving member is being moved, the moving direction of the moving member, and whether the moving member is stopped. A moving state such as “no” is periodically recognized. The period in which the position information of the moving member is created and the period in which the moving state of the moving member is recognized can be shorter than the period of the hot line communication.

The focusing lens 361a is configured to be able to move forward and backward in the direction of the optical axis O by a lens driving unit 370a. By moving the focusing lens 361a, the focal position of the imaging optical system 360 is adjusted. The driving instruction such as the moving direction, the moving amount, and the moving speed of the focusing lens 361a may be based on an instruction from the body-side control unit 230, and the lens-side control unit 330 considers the instruction from the body-side control unit 230. It may be instructed. When a stepping motor and an origin detection unit are used for the lens driving unit 370a, the position of the focusing lens 361a is configured to be able to detect a relative position based on the pulse number (movement amount) of the stepping motor and the detection result of the origin detection unit. ing. Alternatively, an encoder may be provided instead of the origin detection unit to detect the position of the focusing lens.
In FIG. 2, the number of the focusing lens 361a is one. However, as shown in FIG. 12A, the focus position of the imaging optical system 360 may be adjusted by moving a plurality of focusing lenses 363 and 364. In that case, a plurality of lens driving units 370a that drive each of the focusing lenses 363 and 364 in the optical axis O direction may be provided. In FIG. 12A, the positions of the focusing lenses 363 and 364 when the shooting distance from the short focal length W to the long focal length T (focal lengths W to M (W <M <T)) is infinity are shown. Show. In FIG. 12A, the positions of the focusing lenses 363 and 364 are indicated by coordinates of P (a numerical value corresponding to the shooting distance, a symbol corresponding to the focal length).

  The shake correction lens 361b is configured to be movable in a direction intersecting with the optical axis O by the lens driving unit 370b. The movement of the shake correction lens 361b suppresses the swing (image shake) of the subject image on the imaging surface 260S of the image sensor 260. A driving instruction such as a moving direction, a moving amount, and a moving speed of the shake correction lens 361b may be instructed from the lens-side control unit 330. It may be instructed. The position of the shake correction lens 361b is configured to be detectable by a detection element such as a Hall element provided in the lens driving section 370b. As the position information of the shake correction lens 361b, the lens driving unit 370b detects, for example, the position of the optical axis O ′ of the shake correction lens 361b in a plane that intersects with the optical axis O. That is, the coordinate value in the X-axis direction and the coordinate value in the Y-axis direction of the optical axis O ′ of the shake correction lens 361b having the optical axis O as the origin position are detected. Therefore, the position information of the shake correction lens 361b is represented by a position in the X-axis direction and a position in the Y-axis direction. The interchangeable lens 3 does not need to include the shake correction lens 361b. In addition, the interchangeable lens 3 can control the image stabilization function to be off by controlling a position in a plane intersecting the optical axis of the image stabilization lens 361b so as not to operate the image stabilization function.

  The zoom lens 361c is configured to be able to move forward and backward in the optical axis O direction by the lens driving unit 370c or the zoom operation ring 375. As the zoom lens 361c moves, the focal length of the imaging optical system 360 changes between the short focal end W and the long focal end T. The moving direction, the moving amount, the moving speed, and the like of the zoom lens 361c depend on the driving force instructed by the lens-side control unit 330 or mechanically transmitted from the zoom operation ring 375. The position of the zoom lens 361c is configured to be detectable by an encoder or the like of the lens driving unit 370c.

  The diaphragm member 362 has a plurality of diaphragm blades as moving members, and enters the imaging element 260 by changing the size (opening diameter, diaphragm value) of an opening formed using the plurality of diaphragm blades. Adjust the light intensity. The aperture drive unit 380 is configured by a motor and an aperture drive mechanism, and the aperture member 362 is configured to be able to change the aperture diameter (aperture value) by the aperture drive unit 380 and manual operation. The aperture diameter of the aperture member 362 is configured to be detectable by an encoder or the like of the aperture drive unit 380. Alternatively, the relative position of the aperture blades may be detected by providing an origin detection unit (photo interrupter PI) using a stepping motor in the aperture drive unit 380. The position information of the diaphragm blade as the moving member is created as an aperture diameter by the diaphragm driving unit 380 and the lens-side control unit 330.

  The zoom operation ring 375 is provided, for example, on the outer cylinder of the interchangeable lens 3. The user performs a zoom operation to change the focal length of the interchangeable lens 3 with the zoom operation ring 375. An operation signal corresponding to the user's zoom operation is transmitted from the zoom operation ring 375 to the lens-side control unit 330.

The shake sensor 390 detects shake of the interchangeable lens 3 due to hand shake or the like. The shake sensor 390 includes an angular velocity sensor 390a and an acceleration sensor 390b. The shake sensor 390 detects angular shake and translational shake separately for an X-axis direction component and a Y-axis direction component.
The angular velocity sensor 390a detects an angular velocity generated by the rotational movement of the interchangeable lens 3. The angular velocity sensor 390a detects, for example, rotation about each of an axis parallel to the X axis and an axis parallel to the Y axis, and outputs a detection signal regarding the X axis direction and a detection signal regarding the Y axis direction to the lens side control unit 330. Output each.
Further, the acceleration sensor 390b detects the acceleration generated by the translational movement of the interchangeable lens 3. The acceleration sensor 390b detects, for example, an acceleration in an axis parallel to the X axis and an acceleration in an axis parallel to the Y axis, and outputs a detection signal in the X axis direction and a detection signal in the Y axis direction to the lens-side control unit 330, respectively. .
Each of the angular velocity sensor 390a and the acceleration sensor 390b can periodically output a detection signal at a cycle shorter than the cycle of the hot line communication. The interchangeable lens 3 does not need to include the shake sensor 390.

The lens-side communication unit 340 performs predetermined communication with the body-side communication unit 240. The lens-side communication unit 340 is connected to the lens-side control unit 330 and the above-described communication terminal. The lens side communication section 340 includes a lens side first communication section 340a and a lens side second communication section 340b. The lens-side first communication unit 340a is connected to a body-side terminal that performs command data communication described later, and the lens-side second communication unit 340b is connected to a body-side terminal that performs hotline communication described later.
The lens-side first communication unit 340a is connected to the lens-side control unit 330, and information transmitted from the interchangeable lens 3 to the camera body 2 by command data communication is created by the lens-side control unit 330. The lens-side second communication unit 340b is also connected to the lens-side control unit 330, and information transmitted from the interchangeable lens 3 to the camera body 2 by hot line communication is transmitted to the lens-side control unit 330 and the lens-side second communication unit 340b. Created.

<Details of terminals>
FIG. 3 is a circuit diagram schematically showing an electrical connection between the camera body 2 and the interchangeable lens 3. Arrows indicate the signal flow.
The body-side terminal holding section 220 of the body-side mount 210 includes, as the body-side terminals, an LDET (B) terminal, a VBAT (B) terminal, a PGND (B) terminal, a V33 (B) terminal, a GND (B) terminal, and an RDY. (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal. These 11 body-side terminals are collectively referred to as a body-side terminal group. The terminals of the body-side terminal group are arranged in the body-side terminal holding portion 220 in an arc shape centered on the central axis of the body-side mount portion 210 in the order shown in FIG.

  The lens-side terminal holding section 320 of the lens-side mount 310 includes an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, an RDY (L) terminal, and a DATAB. It has an (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and a HDATA (L) terminal. These 11 lens-side terminals are collectively referred to as a lens-side terminal group. The terminals of the lens-side terminal group are arranged in the lens-side terminal holding section 320 in an arc shape centered on the optical axis O in the order shown in FIG.

  The RDY (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal Terminal for command data communication. The HCLK (B) terminal, HDATA (B) terminal, HCLK (L) terminal, and HDATA (L) terminal are communication terminals and are used for hot line communication.

  The RDY (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal are respectively connected to the body-side control unit via the body-side communication unit 240. Connected to 230. The RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal are respectively connected to the lens-side control unit via the lens-side communication unit 340. Connected to 330.

  The RDY (B) terminal is an input terminal to which a signal (hereinafter, an RDY signal) indicating whether or not the interchangeable lens 3 can perform command data communication is input from the RDY (L) terminal. When the command data communication is possible, the lens-side control unit 330 changes the potential of the RDY signal from the L level to the L level once via the H level. When detecting that the potential of the input RDY signal has changed from L level → H level → L level, the body side control section 230 determines that the interchangeable lens 3 is capable of command data communication.

  The DATAB (B) terminal is an output terminal that outputs a data signal (hereinafter, DATAB signal) toward the DATAB (L) terminal of the interchangeable lens 3. In the command data communication, the DATAB signal from the body-side first communication unit 240a is input to the lens-side first communication unit 340a.

  The DATAL (B) terminal is an input terminal to which a data signal (hereinafter, a DATAL signal) from the DATAL (L) terminal is input. In the command data communication, a DATA signal from the lens-side first communication unit 340a is input to the body-side first communication unit 240a.

  The CLK (B) terminal is an output terminal that outputs a clock signal for command data communication (hereinafter, CLK signal) toward the CLK (L) terminal. The CLK signal from the body-side first communication unit 240a is input to the lens-side first communication unit 340a. The command data communication is a bidirectional data communication performed between the camera body 2 and the interchangeable lens 3, and the DATAB signal and the DATAL signal are transmitted and received in synchronization with the CLK signal.

The HCLK (B) terminal is an input terminal to which a clock signal for hot line communication (hereinafter, HCLK signal) from the HCLK (L) terminal is input.
The HDATA (B) terminal is an input terminal to which a data signal of hot line communication (hereinafter, an HDATA signal) from the HDATA (L) terminal is input.
The hot line communication is one-way data communication from the interchangeable lens 3 to the camera body 2, and the second body-side communication unit 240b receives the HDATA signal from the second lens-side communication unit 340b in synchronization with the HCLK signal. I do.

The LDET (B) terminal is the above-described attachment detection terminal. In the camera body 2, the LDET (B) terminal is connected to the body-side control unit 230 via the resistor R2. The power supply V33 supplied from the power supply unit 250 is connected to the resistor R2 and the body-side control unit 230 via the resistor R1.
On the other hand, in the interchangeable lens 3, the LDET (L) terminal is connected (grounded) to the GND potential via the resistor R3. With such a configuration, the LDET (B) terminal is pulled up in the camera body 2 and has the potential of the power supply V33 when the interchangeable lens 3 is not mounted. When the interchangeable lens 3 is mounted, the LDET (L) terminal of the ground potential is connected to the LDET (B) terminal that has been pulled up, and the potential of the LDET (B) terminal decreases. From this, the camera body 2 can detect that the interchangeable lens 3 is attached.

The VBAT (B) terminal and the V33 (B) terminal are power supply terminals for supplying power to the interchangeable lens 3. The VBAT (B) terminal supplies drive system power toward the VBAT (L) terminal. The V33 (B) terminal supplies circuit power to the V33 (L) terminal. The driving system power is supplied to a lens driving unit 370 and an aperture driving unit 380 including an actuator such as a motor. The circuit power is supplied to the lens-side control unit 330 and the lens-side communication unit 340. In the present embodiment, the driving system power is higher than the circuit system power.
The PGND (B) terminal is a ground terminal corresponding to the VBAT (B) terminal. The PGND (B) terminal is connected to the PGND (L) terminal. The GND (B) terminal is a ground terminal corresponding to the V33 (B) terminal. The GND (B) terminal is connected to the GND (L) terminal.
Note that, in FIG. 3, directions in which power is supplied and directions in which signals are transmitted are indicated by arrows.

<Details of communication>
As described above, the body-side first communication unit 240a, the RDY (B) terminal, the DATAB (B) terminal, the CLK (B) terminal, the DATA (B) terminal, and the lens-side first communication unit 340a, RDY (L) Command data communication using the terminal, DATAB (L) terminal, CLK (L) terminal, and DATAL (L) terminal is bidirectional communication between the camera body 2 and the interchangeable lens 3, For example, an instruction for driving the movable member 3 or an instruction for initialization (command data) or transmission of data requested by the body 2 from the interchangeable lens 3 is performed.
Also, a hot line performed using the body-side second communication unit 240b, the HCLK (B) terminal, the HDATA (B) terminal, and the lens-side second communication unit 340b, the HCLK (L) terminal, and the HDATA (L) terminal. The communication is one-way communication from the interchangeable lens 3 to the camera body 2, and the state of the moving member in the interchangeable lens 3 is transmitted from the interchangeable lens 3 to the camera body 2.
Since the camera system 1 has two independent communication systems for command data communication and hot line communication, each communication can be performed in parallel. That is, the camera body 2 and the interchangeable lens 3 can start and end hotline communication while performing command data communication. Also, it is possible to perform command data communication while performing hotline communication. Therefore, the interchangeable lens 3 can continuously transmit data to the camera body 2 by hot line communication even during command data communication. For example, even if the time required for command data communication increases due to an increase in the amount of data, hotline communication can be performed at the required timing.
Further, the camera body 2 can transmit various instructions and requests to the interchangeable lens 3 at any timing by command data communication even while receiving data by hot line communication, Data can be received from the interchangeable lens 3 at an arbitrary timing.

FIG. 4 is a timing chart illustrating command data communication and hot line communication.
After instructing the start of hot line communication by command data communication, the camera body 2 periodically receives data from the interchangeable lens 3 by hot line communication after time t1, for example.
The camera body 2 transmits and receives data to and from the interchangeable lens 3 by command data communication. More specifically, the camera body 2 receives from the interchangeable lens 3 various data instructed by the camera body 2 to transmit to the interchangeable lens 3 from time t2 to t3 and from time t9 to t10. Then, from time t5 to t6, and from time t12 to t13, the camera body 2 transmits various data to the interchangeable lens 3, and at times t4, t7, t8, and t11 between them, a shake correction start instruction, An instruction (command) relating to movement control of the movable member, such as an aperture drive instruction and a focus drive instruction, is transmitted to the interchangeable lens 3.

  In the present embodiment, in the command data communication, there are many types of data to be transmitted and received, and the instruction frequency to the interchangeable lens 3 is high. Further, the time required for transmission / reception becomes longer depending on the type of data. The time for transmitting / receiving various data from time t2 to t3, time t5 to t6, time t9 to t10, and time t12 to t13 is time t4, It is longer than the time for transmitting the instruction at t7, t8 and t11.

  The interchangeable lens 3 transmits, for example, data indicating information (focal length, shooting distance, aperture value, AV value, etc.) of the interchangeable lens 3 in response to an information request instruction from the camera body 2 sent by command data communication. It is transmitted to the camera body 2 by communication. The interchangeable lens 3 further receives data indicating information of the camera body 2 transmitted from the camera body 2 (frame rate, setting of the camera body 2, whether or not a moving image is being recorded, and the like).

The command data communication requires a long time for one transmission / reception, and the frequency of the transmission / reception is high. Therefore, it is difficult to continuously perform the data communication in a short cycle.
On the other hand, the hot line communication uses a communication terminal different from the communication terminal used for command data communication, so that data communication from the interchangeable lens 3 to the camera body 2 can be continuously performed in a short cycle. For example, the hot line communication can be performed in a desired period from the end of the activation processing of the camera body 2 to the interruption processing including during the exposure.
The start instruction and the end instruction of the hot line communication are transmitted from the camera body 2 to the interchangeable lens 3 by the command data communication, but are not limited thereto.

<Description of command data communication>
Next, command data communication will be described with reference to FIG. FIG. 5 illustrates the timings of the RDY signal, the CLK signal, the DATAB signal, and the DATA signal.
In one command data communication, one command packet 402 is transmitted from the camera body 2 to the interchangeable lens 3, and then one data packet 406 and 407 is transmitted and received between the camera body 2 and the interchangeable lens 3. Is done.

At the start of the command data communication (t21), the lens-side first communication unit 340a sets the potential of the RDY signal to the L level. When the RDY signal is at the L level, the body-side first communication unit 240a starts outputting the CLK signal 401. The frequency of the CLK signal 401 is, for example, 8 MHz. The body-side first communication unit 240a outputs a DATAB signal including a command packet 402 of a predetermined length in synchronization with the clock signal 401. The command packet 402 is indicated by switching between H level and L level. After outputting the CLK signal 401 for a period corresponding to the data length of the command packet 402, the body-side first communication unit 240a thereafter ends the output of the CLK signal (t22).
The command packet 402 includes, for example, synchronization data, data for identifying the order of command data communication, data indicating an instruction from the camera body 2, data indicating the data length of the subsequent data packet 406, communication Includes data for error checking. The instructions included in the command packet 402 include, for example, an initialization instruction and a driving instruction of a moving member from the camera body 2 to the interchangeable lens 3, an instruction to transmit data from the camera body 2 to the interchangeable lens 3, and the like.
The interchangeable lens 3 may determine the presence or absence of a communication error based on whether or not the value calculated from the received command packet 402 matches the communication error check data included in the command packet 402.
When the reception of the command packet 402 is completed, the first lens-side communication unit 340a sets the RDY signal to the H level, and the lens-side control unit 330 starts the first control process 404 based on the command packet 402 (t22).

  When the first control process 404 by the lens-side control unit 330 is completed, the lens-side first communication unit 340a can set the RDY signal to the L level (t23). When the input RDY signal goes low, the body-side first communication unit 240a outputs a CLK signal 405.

The body-side first communication unit 240a outputs a DATAB signal including the data packet 406 in synchronization with the CLK signal 405. Further, the lens-side first communication unit 340 a outputs a DATA signal including a data packet 407 of a predetermined length in synchronization with the CLK signal 405. Data packets 406 and 407 are shown by switching between H level and L level. After outputting the CLK signal 405 for a period corresponding to the data length of the data packet 406, the body-side first communication unit 240a thereafter ends the output of the CLK signal (t24).
The data packets 406 and 407 are m-byte variable length data having the number of data indicated by the command packet 402. The data packets 406 and 407 include data for synchronization, data indicating information on the camera body 2, data indicating information on the interchangeable lens 3, data for checking a communication error, and the like.
The data packet 406 transmitted from the camera body 2 to the interchangeable lens 3 includes data indicating a driving amount of the moving member, data for transmitting settings and an operation state in the camera body 2, and the like.
The data packet 407 transmitted from the interchangeable lens 3 to the camera body 2 includes data indicating model name information of the interchangeable lens 3, data indicating a moving state of a moving member in the interchangeable lens 3, a focal length of the interchangeable lens 3, and the like. And data on optical characteristics.
The receiving device (the interchangeable lens 3 or the camera body 2) determines whether or not the value calculated from the received data packets 406 and 407 matches the communication error check data included in the data packets 406 and 407. It is sufficient to determine the presence or absence of a communication error.
When the transmission and reception of the data packets 406 and 407 are completed, the first lens-side communication unit 340a sets the RDY signal to the H level, and the lens-side control unit 330 starts the second control processing 408 based on the data packets 406 and 407. (T24).

(Description of First and Second Control Processes)
Next, an example of the first control processing 404 and the second control processing 408 of the command data communication will be described.
For example, it is assumed that the command packet 402 includes a driving instruction for the focusing lens 361a. The lens-side control unit 330 generates a data packet 407 indicating that a driving instruction for the focusing lens 361a has been received, as a first control process 404.

  Next, as a second control process 408, the lens-side control unit 330 issues an instruction to the lens driving unit 370a to move the focusing lens 361a by the movement amount indicated by the data packet 406. Thereby, the movement of the focusing lens 361a in the optical axis O direction is started. When an instruction to move the focusing lens 361a is issued from the lens-side control unit 330 to the lens driving unit 370a, the lens-side first communication unit 340a determines that the second control process 408 has been completed and sets the RDY signal to the L level (t25). .

  Further, for example, it is assumed that the command packet 402 includes an instruction to start hot line communication. The lens-side control unit 330 generates a data packet 407 indicating that the instruction to start the hot line communication has been received as the first control processing 404. Next, as the second control process 408, the lens-side control unit 330 causes the lens-side second communication unit 340b to start hotline communication. When instructing the start of the hot line communication, the lens-side controller 330 determines that the second control process 408 has been completed, and sets the RDY signal to the L level (t25).

<Explanation of hotline communication>
Next, the hot line communication will be described with reference to FIG. FIG. 6 illustrates the timing of the HCLK signal and the HDATA signal. In one hotline communication, one HDATA signal 503 is transmitted from the interchangeable lens 3 to the camera body 2 in synchronization with one HCLK signal 502.

  When the camera body 2 according to the present embodiment receives the initialization completion signals of all the moving members, the camera body 2 sends a hot line communication start instruction to the interchangeable lens 3. In other words, the camera body 2 does not send a hot line communication start instruction until all the moving members have been initialized. The interchangeable lens 3 also does not transmit the data of the hot line communication until all the moving members have been initialized and the start instruction of the hot line communication is received. The instruction to start the hot line communication includes information that has been previously determined between the interchangeable lens 3 and the camera body 2 regarding the hot line communication. Regarding the hot line communication, for example, the data length (the number of bytes) of the HDATA signal transmitted by one hot line communication, the data to be included in the HDATA signal and its order, the clock frequency and the cycle of the HCLK signal (Tinterval in FIG. 6) And a communication time in one cycle (Ttransmit in FIG. 6). This information is called generation information of the hot line communication. In this embodiment, the frequency of the HCLK signal is 2.5 MHz, the data length of one hot line communication is longer than the command packet 402, the cycle of one hot line communication is 1 millisecond, and the communication time in one cycle is transmission. Less than 75% of the interval, but not limited to. Also, position information on the moving member is sent as data to be included in the HDATA signal. For example, position information of the focusing lens 361a and position information of the shake correction lens 361b are sent. Note that one hot line communication refers to data transmission performed in one cycle of the hot line communication, and from a hot line communication start instruction to a hot line communication end instruction by command data communication from the camera body 2. different. As described above, the state of the optical system of the interchangeable lens 3 such as the focal length, the photographing distance, the aperture value, and the AV value and the state of the aperture member 362 in the interchangeable lens 3 are transmitted from the interchangeable lens 3 to the camera body 2 by command data communication. Sent.

  First, the operation of the lens-side second communication unit 340b in hotline communication will be described. When receiving an instruction to start hot line communication by command data communication before time t31, the lens-side second communication unit 340b starts outputting the HCLK signal to the camera body 2 (t31). The HCLK signal is periodically output from the interchangeable lens 3, and is shown as HCLK signals 502, 502 ',... In FIG.

The lens-side second communication unit 340b outputs an HDATA signal in synchronization with the HCLK signal. The HDATA signal is indicated by switching between H level and L level. One HDATA signal has a predetermined data length, and is shown in FIG. 6 as having N 1-byte data including 8 bits D0 to D7. One HDATA signal may include an unused bit area or an unused byte area in order to have a fixed length. A predetermined initial value is input to an unused bit area and an unused byte area. The HDATA signal is periodically output from the interchangeable lens 3 in synchronization with the HCLK signals 502, 502 ',..., And is represented as HDATA signals 503, 503',.
When transmission of the HDATA signal is completed (t32), the lens-side second communication unit 340b stops outputting the HCLK signal until time t34 when transmission of the next HDATA signal starts. One hot line communication is performed from time t31 to t32, and one cycle of hot line communication is performed from time t31 to t34. As described above, in the present embodiment, one hot line communication cycle (t31 to t34) is 1 millisecond, and one hot line communication time (t31 to t32) is less than 75% of one cycle. It is. The lens-side second communication unit 340b starts the second hotline communication from time t34.
The lens-side second communication unit 340b continues the hot-line communication periodically until a command to end the hot-line communication is transmitted from the camera body 2 by the command data communication.

  The lens-side second communication unit 340b transmits the HDATA signals 503, 503 ',... To the body-side second communication unit 240b by a built-in serial communication unit. The lens-side second communication unit 340b efficiently transfers data stored in a data area of a memory (not shown) as an HDATA signal using, for example, a DMA (Direct Memory Access) function. The DMA function is a function for automatically accessing data on a memory without the intervention of a CPU.

Next, the operation of the body-side second communication unit 240b in hotline communication will be described. In the present embodiment, when the body-side second communication unit 240b completes the initialization process at the time of power-on, or determines to transmit a command for starting hotline communication by command data communication, the body-side second communication unit 240b connects to the HDATA (B) terminal. The HCLK (B) terminal is put on standby in a receivable state.
Here, the initialization processing will be described. The initialization processing includes initialization of the lens-side first communication unit 340a and the lens-side second communication unit 340b, which are communication units, and initialization of the diaphragm member 362, the focusing lens 361a, and the shake correction lens 361b, which are moving members. Processing is included.
The description of the initialization process of the moving member of the interchangeable lens 3 (the lens or the aperture member 362, which is a driven member driven by receiving a driving force) will be continued. In the initialization process of the moving member of the interchangeable lens 3, first, an initialization instruction (initialization start command) of each moving member is transmitted from the camera body 2 to the interchangeable lens 3 by command data communication. Upon receiving the initialization instruction, the interchangeable lens 3 starts initialization of each moving member (the focusing lens 361a, the shake correction lens 361b, and the aperture member 362). The initialization of each moving member is performed by driving each driving unit to drive the moving member so as to pass through each origin position. After transmitting the initialization instruction (initialization start command), the camera body 2 transmits an instruction (status request command) for requesting the initialization status to the interchangeable lens 3. When the interchangeable lens 3 receives the command packet including the status request command, the interchangeable lens 3 transmits a data packet including the initialization status of each moving member to the camera body 2 by a command signal. The interchangeable lens 3 uses a single command signal to indicate the initialization status of each moving member (the focusing lens 361a, the shake correction lens 361b, and the aperture member 362) (a status indicating whether initialization is in progress or has been completed). Each is transmitted in an identifiable manner. The moving member for which initialization has been completed is transmitted with an identification signal indicating completion. During the initialization, that is, for a moving member whose initialization is not completed, the moving member is transmitted with an identification signal indicating that it is not completed. The camera body 2 repeats the status request command at a predetermined cycle until the identification signals indicating the completion of the initialization are transmitted from all the movable members from the interchangeable lens 3. After the initialization of all the moving members is completed, the camera body 2 transmits a drive instruction (command) to each moving member. Based on the driving instruction received from the camera body 2, the interchangeable lens 3 drives the instructed moving member, and transmits the driving state of the moving member to the camera body 2 by hotline communication.

  Returning to the description of the hot line communication with reference to FIG. When the transmission of the HDATA signal is started from the interchangeable lens 3 and the reception of the data of the predetermined length is completed (time t33) after a lapse of a predetermined time Terror0 from the start time t31 (time t33), the body-side second communication unit 240b The received data is determined as having been successfully communicated. The predetermined time Terror0 is a time that allows a margin for the communication time Ttransmit in one cycle, and is, for example, 80% of one cycle. Even after receiving the HDATA signal once, the body-side second communication unit 240b keeps the HDATA (B) terminal and the HCLK (B) terminal in a receivable state, and when one cycle has elapsed from time t31, the next HDATA signal is output. Signal reception is started (t34).

If the reception of data of a predetermined length is not completed within a predetermined time Terror0 from the start of transmission of the HDATA signal by the lens-side second communication unit 340b, the body-side second communication unit 240b cannot perform normal communication. (Communication error) and discard the received data.
In the hot line communication, it is preferable that the communication time (Ttransmit) in one cycle does not exceed 75% so that communication error processing or the like can be performed in each cycle (between time t33 and time t34). is not.

<Hotline data>
In one hotline communication, one hotline data 90 is transmitted from the interchangeable lens 3 to the camera body 2.
The hotline data 90 includes, for each moving member, at least two types of information, that is, position information of the moving member (hereinafter, first information) and information (hereinafter, second information) that can be used to calculate the driving amount of the moving member. Can be included. In the case of the present embodiment, the hot line data 90 includes first data 91 including first information indicating a position of the focusing lens 361a and second information that can be used for calculating a driving amount of the focusing lens 361a, and a shake correction lens 361b. , And second data 92 including second information that can be used for calculating the drive amount of the shake correction lens 361b. The information included in the first data 91 and the information included in the second data 92 may be the same or may be partially different. Further, the camera body 2 may calculate the drive amount using the second information, or may calculate the drive amount without using the second information. When the interchangeable lens 3 does not have the shake correction lens 361b or does not operate the shake correction function with the interchangeable lens 3, the hotline data 90 may include the first data 91 and do not include the second data 92. The second data 92 may include predetermined dummy data. When dummy data is included, the data length of the hot line data 90 can be fixed regardless of the presence or absence of the shake correction function.
The second information can be set for each moving member. For example, the reliability of the position information (information indicating the reliability of the position information, information indicating the validity of the position information being valid or invalid, an identifier, and the like), the moving state of the moving member, and the operating members such as the zoom operation ring 375 At least one of the operation states is included. The above-described information, status, and the like are represented in the form of numerical values and identifiers by the lens-side control unit 330, the lens-side second communication unit 340b, and the like, and are included in the hotline data 90. As the first data 91 of the focusing lens 361a, the first information indicating the position of the focusing lens 361a and the reliability of the position information as second information that can be used for calculating the driving amount of the focusing lens 361a (indicating the reliability of the position information). (Information or identifiers whose information or position information is valid or invalid).
Since the hot run data 90 transmitted in one hot line communication includes at least one of the first information and the second information, the camera body 2 transmits the first information and the second information in one hot line communication. Can be obtained with Here, for example, when the first information and the second information are received by separate communications, it is necessary to match the timing at which the camera body 2 creates the first information with the timing at which the second information is created. However, according to the present embodiment, since a plurality of pieces of information are transmitted by one hot line communication, the plurality of pieces of information can be easily considered in the camera body 2.
In the present embodiment, among the moving members of the interchangeable lens 3, the position information of the aperture member 362 is transmitted to the camera body 2 by command data communication instead of hot line communication. That is, information on the aperture value or the AV value of the aperture member 362 is transmitted from the interchangeable lens 3 to the camera body 2 by a DATA signal of command data communication. Since the focusing lens 361a and the shake correction lens 361b move a large amount and move finely and frequently, it is preferable to periodically send them by hot-line communication. An interval is sufficient. By transmitting the position information of the aperture member 362 by command data communication, the data amount of hot line communication transmitted at one time can be reduced. Thereby, the speed of the hot line communication can be increased. In addition, from the viewpoint of the data amount, the command data communication may not include information indicating whether the position information of the aperture member 362 is valid or invalid.

(Description of First Data 91)
FIG. 7 is a diagram illustrating information included in the first data 91.
The first data 91 includes data 91a relating to the position of the focusing lens 361a as first information. The first data 91 includes, as second information, data 91b relating to the reliability of the data 91a, data 91c relating to the moving state of the focusing lens 361a, data 91d relating to whether the focusing lens 361a is at a designed position, and operation. The data includes at least one of data 91e relating to the operation state of the member and data 91f relating to the operation state in response to the focusing drive instruction. Here, the second information is information that can be considered when creating a focus drive instruction in the camera body 2. The second information may be any information that can affect the calculation of the driving amount of the focusing lens 361a, and can be changed as appropriate.

  The data 91a includes a numerical value indicating position information of the focusing lens 361a in the optical axis O direction detected by the lens driving unit 370a. The position information may be an absolute position of the focusing lens 361a in the direction of the optical axis O, a relative position such as a movement amount of the focusing lens 361a from the origin in the direction of the optical axis O, or a position of the focusing lens 361a. The photographing distance determined from the distance may be used. The data 91a may include, for example, a value indicating the current position of the focusing lens 361a by associating a value from 0 to 255 with each position from infinity to the closest end of the focusing lens 361a at each focal length. The data 91a can also be represented by the number of pulses output from the lens driving unit 370a, and in that case, the data 91a can be easily created, which is preferable. In the case where a plurality of focusing lenses 363 and 364 are provided, the data 91 a of the present embodiment is position information of one focusing lens selected from the plurality of focusing lenses 363 and 364. , 364 may be considered as the position information of one virtual lens. Even when a plurality of focusing lenses 363 and 364 are provided, the data length of the hot line data 90 can be fixed regardless of the number of focusing lenses by using the position information (data 91a) of one moving member. Further, there is no need to transmit the number of focusing lenses to the camera body 2, and there is an effect that the camera body 2 does not need to change the control according to the number of focusing lenses.

  The data 91c relates to the moving state of the focusing lens 361a, an identifier indicating whether the focusing lens 361a is moving, an identifier indicating whether the focusing lens 361a is movable, and a moving direction of the focusing lens 361a. , And the like.

The data 91d relates to whether or not the focusing lens 361a is at a designed position, for example, an identifier indicating whether or not zoom tracking is being performed, and priority is given to speed over a designed movement locus (movement locus when optical performance is prioritized). It includes an identifier indicating whether or not it is moving along the movement trajectory. The designed position of the focusing lens 361 is, for example, a position in the optical axis O direction uniquely obtained from the focal length and the shooting distance. Generally, the interchangeable lens 3 is designed so that the position of the focusing lens 361a in the direction of the optical axis O according to the focal length and the photographing distance is set, and desired optical performance is achieved. However, when giving priority to the moving speed of the focusing lens 361a over the optical performance, such as zoom tracking and initialization operation, the focusing lens 361a moves via a position different from the originally set position, and moves along with the designed movement trajectory. May have different trajectories. In this case, for example, when the focusing lens 361a is not within the designed movement range (for example, a region below L0 in the graph of FIG. 8), the optical performance of the interchangeable lens 3 may be reduced. Therefore, during zoom tracking, an identifier indicating that the focusing lens 361a is not at the designed position may be uniformly selected to easily select the identifier.
The interchangeable lens 3 can transmit by hotline communication whether or not the focusing lens 361a is at the designed position based on the data 91d. The camera body 2 is not at the designed position of the focusing lens 361a. That is, it is possible to perform processing in consideration of the possibility that the optical performance is reduced.

The data 91b includes an identifier indicating whether or not the data 91a is valid with respect to the reliability of the data 91a that is the position information. The body-side control unit 230 can know the reliability of the data 91a (position information) from the data 91b.
When adjusting the focal position with a plurality of focusing lenses 363 and 364, if the relative positions of the focusing lenses 363 and 364 in the direction of the optical axis O are different from the designed positions, the lens-side control unit 330 defines the shooting distance. The reliability of the data 91a is reduced. That is, in FIG. 12A, when the zoom operation is performed from the focal length W to the focal length T via the focal length M, the focusing lens 363 has a moving locus when the optical performance is prioritized and a moving locus when the speed is prioritized. Since they coincide with each other, they move from P (0, W) to P (0, T) via P (0, M), and the numerical value indicating the position in the optical axis O direction remains unchanged at 0. On the other hand, the focusing lens 364 moves from P ′ (0, W) to P ′ (191, M) when the movement trajectory at the time of optical performance priority and the movement trajectory at the time of speed priority do not coincide with each other and moves with speed priority such as zoom tracking. ), And moves to P ′ (0, T), and the numerical value indicating the position in the optical axis O direction changes from 0 to 191. Then, the numerical values indicating the positions in the optical axis O direction do not match between the focusing lens 363 and the focusing lens 364, and the shooting distance cannot be defined. In such a case, the lens-side control unit 330 determines the data 91a to be the upper and lower limits of the limit range, uses the data 91d as an identifier that includes a plurality of focusing lenses 363 and 364, and indicates that zoom tracking is being performed, and uses the data 91b as the position. This is an identifier indicating that the information (data 91a) is invalid. In the present embodiment, when a plurality of focusing lenses 363 and 364 are provided, an identifier indicating invalid position information is selected uniformly in the data 91b during zoom tracking, and the identifier is easily selected. is not. For example, as illustrated in FIG. 12B, when the focusing 364 partially matches the movement trajectory when the optical performance is prioritized and the movement trajectory when the speed is prioritized, the lens-side control unit 330 controls the focusing lens 363. The identifier of the data 91b may be selected according to whether the numerical value indicating the position in the optical axis O direction and the numerical value indicating the position of the focusing lens 364 in the optical axis O direction match. In this case, the number of hotline communications in which the data 91a is determined to be invalid by the data 91b can be reduced. When the number of focusing lenses 361a is one, the data 91b may indicate that the data 91a is always valid regardless of the reliability of the data 91a. That is, the data 91b may indicate the reliability of the position information when the focusing lenses 363 and 364 are plural.

The data 91e relates to an operation state of an operation member such as the zoom operation ring 375. The operation state of the operation member is represented by an identifier indicating whether the operation member is being operated, an identifier indicating the operation direction of the operation member, an identifier indicating the operation speed of the operation member, and the like. When the zoom operation ring 375 is rotated and the zoom operation is performed, the lens-side control unit 330 selects an identifier indicating that the operation member is being operated in the data 91e, and moves the zoom lens 361c in the optical axis O direction. Then, it is recognized that the focal length of the imaging optical system 360 has changed. The focal length recognized by the lens-side control unit 330 is also transmitted based on a transmission instruction from the camera body 2 in command data communication.
Here, when a zoom operation is performed, so-called zoom tracking needs to be performed so as not to change the shooting distance while changing the focal length. FIG. 8 shows the focal length (wide corresponds to 0, tele corresponds to 5), shooting distance (infinity corresponds to L0, close proximity corresponds to L4), and the position of the focusing lens 361a in the optical axis O direction ( (Design value). The lens-side storage unit 350 stores a table indicating the relationship between the shooting distance and the position of the focusing lens 361a in the optical axis O direction for each of the focal lengths 0 to 5. In the present embodiment, the position of the focusing lens 361a in the optical axis O direction is represented by a numerical value corresponding to the number of pulses of the lens driving unit 370a. For example, if the focusing lens 361a is at P (0,1) in FIG. 8 before the zoom operation, the lens driving unit 370a moves the focusing lens 361a to P (0,2), P ( 0, 3),... As described above, when performing the zoom tracking accompanying the zoom operation, there is a possibility that the focusing lens 361a is moved with speed priority during the zoom tracking. In this case, for example, if the focusing lens 361a is moved along a straight line connecting P (0,1) and P (0,5) in FIG. 8, it does not pass through the designed position on the curve L0, The optical performance of the imaging optical system 360 may be reduced. However, according to the present embodiment, the camera body 2 can recognize that the zoom operation is being performed by hotline communication, and can recognize that the focusing lens 361a may not be at the designed position.

The data 91f is related to an operation state with respect to the focusing drive instruction, an identifier indicating whether the interchangeable lens 3 is executing the drive instruction, an identifier indicating whether the interchangeable lens 3 is in a state capable of receiving the drive instruction, It is represented by an identifier indicating whether or not the interchangeable lens 3 has completed the drive instruction. In the present embodiment, the identifier indicating the reception disabled state in which the drive instruction cannot be executed uniformly during zoom tracking is selected, but the present invention is not limited to this. According to the present embodiment, the camera body 2 can recognize that the execution of the driving instruction has been completed by the hot line communication of a quick cycle, and can quickly perform the processing after the execution is completed. The processing after completion of execution includes, for example, in the case of a focus drive instruction, a process of notifying the user that the subject is in focus after the drive instruction, and the user recognizes that the subject is in focus quickly and performs shutter release. You can prevent missing a chance.
The data 91 may include an ID number or the like for recognizing the drive instruction transmitted by the camera body 2. When the drive of the interchangeable lens 3 is controlled based on a drive instruction from the camera body 2, an ID number or the like included in the command packet 402 of the drive instruction may be included in the data 91. Even when the same type of drive instruction is periodically transmitted from the camera body 2 such as a focus drive instruction, the timing at which the interchangeable lens 3 is operating is transmitted to the camera body 2 based on the output drive instruction. It is possible.

(Explanation of the second data 92)
FIG. 9 is a diagram illustrating information included in the second data 92.
The second data 92 is, for example, data 92 h to 92 k relating to the amount of shake correction in the interchangeable lens 3, data 92 l and 92 m relating to the amount of shake of the subject image on the imaging surface 260 S calculated by the interchangeable lens 3, and is detected by the shake sensor 390. Data 92n and 92o regarding the residual shake amount obtained from the detected signal and the position of the shake correction lens 361b, data 92a to 92d regarding the shake state detected by the shake sensor 390, the reliability of the shake correction amount or the calculated shake amount. At least one of data 92e and 92f relating to the movement of the shake correction lens 361b.

The data 92 a to 92 d include an identifier related to the shake state detected by the shake sensor 390 and selected by the lens-side control unit 330 based on a detection signal from the shake sensor 390. The lens-side control unit 330 determines the shake state from the detection signal of the shake sensor 390. In the present embodiment, as the shake state, a state in which the composition is being changed, a state in which the composition is stable, a state in which the composition is fixed to a tripod, and the like are determined. The lens-side control unit 330 selects an identifier indicating whether the composition is being changed, an identifier indicating whether the composition is in the stable state, and an identifier indicating whether the tripod is in the fixed state. Send. The lens-side control unit 330 performs shake correction control suitable for each shake state, such as changing the cutoff frequency of the detection signal.
The data 92a indicates a shake state related to the angular shake in the X-axis direction output by the shake sensor 390. For example, based on the X-axis direction angular shake detection signal, the lens-side control unit 330 may determine whether the composition is being changed, an identifier indicating whether the composition is stable, an identifier indicating whether the tripod is in a fixed state, Are selected and set as data 92a.
The data 92b differs from the data 92a in that the above determination is made in the Y-axis direction.
The data 92c differs from the data 92a in that the above determination is made on translational shake.
The data 92d is different from the data 92a in that the above determination is made on the translational shake in the Y-axis direction.
The body-side control unit 230 can know the determination result of the shake state of the interchangeable lens 3 from the data 92a to 92d. Therefore, the body-side control unit 230 can perform shake correction control in which the shake state is adjusted according to the determination result of the interchangeable lens 3. Note that the body-side control unit 230 may determine the shake state based on the detection result of the shake sensor 290, and the body-side control unit 230 does not determine the shake state based on the detection result of the shake sensor 290. Is also good.

The data 92g includes an identifier related to the movement state of the shake correction lens 361b and selected by the lens-side control unit 330 based on the shake control state of the interchangeable lens 3. In the present embodiment, the shake control state includes, for example, during still image stabilization, during moving image stabilization, and during non-shake correction. The state during non-vibration correction means a state in which the lens driving unit 370b is not driven and no vibration correction is performed. “Still image stabilization in progress” refers to a state in which shake correction suitable for capturing a still image is being performed based on a still image stabilization start instruction transmitted from the camera body 2 by command data communication. Moving image stabilization is a state in which shake correction suitable for capturing a moving image or a live view image is performed based on a moving image stabilization start instruction transmitted from the camera body 2 by command data communication. In general, it is set so that the effect of shake correction is stronger during moving image stabilization than during still image stabilization.
The body-side control unit 230 can know the movement state of the shake correction lens 361b from the data 92g, and can reflect the movement state on the shake correction control by the body-side control unit 230.

The data 92h to 92k represent a numerical value indicating the position of the shake correction lens 361b by the lens driving unit 370b or the shake correction lens by the lens side control unit 330 regarding the shake amount (shake correction amount) corrected in the interchangeable lens 3. A numerical value indicating the amount of movement of the shake correction lens 361b calculated from the position of 361b is shown.
Data 92h indicates the current position of the optical axis O 'of the shake correction lens 361b in the X-axis direction. In the present embodiment, the data 92h indicates a coordinate value in the X-axis direction detected in the interchangeable lens 3 converted into a coordinate value (image plane conversion value) on the imaging surface 260S of the imaging element 260. The image plane conversion value is calculated by multiplying the coordinate value of the shake correction lens 361b detected by the interchangeable lens 3 by the image stabilization coefficient. The image stabilization coefficient indicates a movement amount of the image plane on the imaging surface 260S with respect to a unit movement amount of the shake correction lens 361b, and varies depending on a focal length and a photographing distance of the imaging optical system 360. And so on. The lens-side control unit 330 reads from the lens-side storage unit 350 an anti-vibration coefficient corresponding to a focal length and a shooting distance when the coordinate value of the shake correction lens 361b is detected, and calculates an image plane conversion value.
Calculating the image plane conversion value with the interchangeable lens 3 has the effect of eliminating the need to transmit an image stabilization coefficient according to the focal length and the shooting distance to the camera body 2, but the value before the image plane conversion is converted to a hot line. It may be transmitted by communication.
The data 92i differs from the data 92h in that the above determination is made in the Y-axis direction.
The data 92j differs from the data 94h in that the data 92j is a shake correction amount obtained from the position of the shake correction lens 361b by the lens-side control unit 330. For example, the lens-side control unit may use the same value as the data 92h as the data 92j, or may use the coordinate value representing the position of the shake correction lens 361b as the data 92j without converting it into an image plane, and the position of the shake correction lens 361b. The movement amount of the shake correction lens 361b calculated from may be used as the data 92j.
The data 92k differs from the data 92j in that the above determination is made on the Y axis.
The body-side control unit 230 can know the shake amount (shake correction amount) corrected by the interchangeable lens 3 from the data 92h to 92k.

The data 92l and 92m relate to the shake amount (total shake amount) of the subject image on the imaging surface 260S calculated by the interchangeable lens 3, and are controlled on the lens side based on the detection signal of the shake sensor 390 and the image stabilization coefficient when the detection signal is output. It is represented by a numerical value calculated by the unit 330.
Data 92l indicates the total amount of shake in the X-axis direction detected by the interchangeable lens 3 in terms of image plane. The image plane conversion is as described above.
The data 92m differs from the data 92l in that the above determination is made on the Y axis.
The body-side control unit 230 can know the total shake amount calculated by the interchangeable lens 3 from the data 92l and 92m, and can confirm whether the total shake amount has been completely corrected.

The data 92n and 92o are values calculated by the lens-side control unit 330 regarding the residual shake amount obtained from the detection signal detected by the shake sensor 390 and the position of the shake correction lens 361b. Here, the residual shake amount may be a value obtained by subtracting the shake correction amount represented by the data 92j and 92k from the total shake amount represented by the data 92l and 92m. Since the residual shake amount can also be calculated by the camera body 2, when sending at least one of the shake correction amount or the current position of the shake correction lens 361b and the total shake amount, it may be omitted from the hot line data 90.
The data 92n indicates the amount of residual shake in the X-axis direction that could not be corrected by the interchangeable lens 3 in terms of the image pickup surface 260S of the image sensor 260. The image plane conversion is as described above.
The data 92o differs from the data 92n in that the above determination is made on the Y axis.
The body-side control unit 230 can know the amount of shake remaining after performing shake correction control with the interchangeable lens 3 based on the data 92n and 92o. The shake that could not be corrected by the interchangeable lens 3 can be corrected without performing the calculation.

The data 92e and 92f relate to the reliability (effectiveness) of the position information of the shake correction lens 361b and the reliability (effectiveness) of the calculated shake amount and the shake correction amount. Contains the identifier selected based on reliability (validity). In the present embodiment, the data 92e and 92f indicate whether the data 92h to 92o are valid, respectively, but are not limited thereto.
The body-side control unit 230 can know the reliability of the data 92h to 92o from the data 92e and 92f.

<Explanation of automatic focus adjustment>
Hereinafter, an example of automatic focusing with zoom tracking will be described with reference to FIG. FIG. 10 is a timing chart illustrating the timing of the automatic focus adjustment. FIG. 10 shows an example in which the operation of capturing a monitor image called a live view image is repeated at a frame rate of, for example, 1/60 second.
Before the timing chart in FIG. 10, it is assumed that the hot line communication has been started and the hot line data 90 is periodically transmitted from the interchangeable lens 3 to the camera body 2 at times t61, 62,. It is also assumed that the interchangeable lens 3 is executing the focus drive instruction of the operation ID 2 at time t61 in FIG. 10 and the user operates the zoom operation ring 375. From time t61, the zoom operation ring 375 continues to be rotated and the shooting distance continues to change, and at times t65 and t71, an operation signal of the zoom operation ring 375 is output, and the focal length recognized by the lens-side control unit 330 changes stepwise. Change. In FIG. 10, the distance between the subject and the camera body 2 does not change, and the position of the focusing lens 361a in the optical axis O direction is adjusted by zoom tracking accompanying the operation of the zoom operation ring 375. In FIG. 10, the position information of the data 91 a is represented in a numerical range from the closest end to the infinite end 255 at each focal length, so that the focal length recognized by the lens-side control unit 330 changes stepwise. At time t65, the numerical value of the data 91a greatly changes even if the position of the focusing lens 361a in the optical axis O direction has not changed.

Hereinafter, the reason why the data 91a changes at time t65 in FIG. 10 will be described with reference to FIG. In FIG. 8, the position of the focusing lens 361a in the direction of the optical axis O is indicated by associating a value from 0 to 255 with each position from infinity to the closest end of the focusing lens 361a at each focal length. Therefore, in P (0,0), P (0,1),..., P (0,5) in FIG. 8, the numerical value included in the data 91a is 0. Similarly, in P (4,0), P (4,1),..., P (4,5) in FIG. 8, the numerical value included in the data 91a is 255.
Until time t64, assuming that the focusing lens 361a is located at the position indicated by P (0, 2) in FIG. 8 with the focal length 2 and the photographing distance L0, the value of the data 91a as the positional information of the focusing lens 361a Becomes 0. Therefore, the value of the data 91a is 0 until time t64.
Next, when the focal length changes to 1 at time t65 without changing the position of the focusing lens 361a, the value of the data 91a becomes 0 corresponding to P (0, 2) in FIG. To 63 corresponding to P (1,1). That is, the lens-side controller 330 refers to the table of the focal length 1 and recognizes that the shooting distance has changed to L1. Then, the lens-side control unit 330 moves the focusing lens 361a to P (0,1) in which the value of the data 91a is equal to 0 in order to return to the shooting distance L0 before the zoom operation by zoom tracking. Zoom tracking is performed between time t65 'and t66, and the value of the data 91a changes from 63 to 0.

The signal processing unit 270 performs predetermined image processing on the imaging pixel signal output from the imaging element 260 each time one accumulation is completed, and generates a live view image. Further, the signal processing unit 270 calculates the defocus amount based on the focus detection pixel signal output from the image sensor 260 each time one accumulation is completed. Further, the body-side first control unit 230a calculates the driving amount of the focusing lens 361a based on the calculated defocus amount and the position information (current position) of the focusing lens 361a transmitted by hot line communication.
Here, in the present embodiment, when the drive amount is calculated based on the focus detection pixel signal output in the accumulation up to time t63, transmission is performed by hot line communication indicated by times t61, t62,... Included in the accumulation time. At least one piece of position information of the focusing lens 361a is used (preferably by calculating an average of a plurality of pieces of position information). As described above, since the driving amount of the focusing lens 361a can be calculated using the position information of the focusing lens 361a at the time included in the accumulation time, the accuracy of the focus adjustment is improved. The body-side first control unit 230a calculates the drive amount based on the focus detection pixel signal output in the accumulation up to time t63 and the hot line data 90 between times t61 and t63 by the command data communication at time t64 using operation ID4. Is transmitted as a focus drive instruction. According to the present embodiment, as indicated by times t63, t64, t67, t68, t70, and t73, the body-side first control unit 230a transmits a focus drive instruction with an operation ID for each accumulation. The interchangeable lens 3 starts driving the focusing lens 361a based on the focus drive instruction of the new operation ID, and transmits the operation ID being executed by hot line communication. Although not shown in FIG. 10, the camera body 2 may perform command data communication for each accumulation and acquire information such as the focal length necessary for the focus detection process from the interchangeable lens 3. Further, the operation ID and the operation status may be transmitted to the camera body 2 by both the command data communication and the hot line communication.

When the operation signal of the zoom operation ring 375 is output at time t65, the lens-side control unit 330 changes the identifier of the data 91e and transmits to the camera body 2 by hotline communication that the zoom operation has been performed. Also, at times t65 ′ to t66 during zoom tracking, the lens-side control unit 330 changes the identifiers of the data 91d and data 91f, and determines that zoom tracking is in progress and that a focus drive instruction cannot be executed. The data is transmitted to the camera body 2 by line communication.
When calculating the drive amount of the focusing lens 361a based on the focus detection pixel signals accumulated from time t64 to t67, the body-side first control unit 230a includes hot line data including data 91d and 91f indicating that zoom tracking is being performed. The drive amount may be calculated without using the 90 position information (data 91a). That is, the body-side first control unit 230a may calculate the drive amount using the highly reliable position information transmitted between times t64 to t65 and t66 to t67. Alternatively, the body-side first control unit 230a determines that the focus drive instruction based on the focus detection pixel signals accumulated from time t64 to t67 is a focus drive instruction created including low-reliability position information. The information shown (“unsuitable” in FIG. 10) may be added to the output to the interchangeable lens 3. In this case, the interchangeable lens 3 may discard the received focus drive instruction, and may indicate that the operation ID has been completed at the time t69 while the operation ID remains the previous operation ID5.

  In general, in the automatic focus adjustment processing, if zoom tracking is performed during accumulation, the position of the focusing lens 361a changes, so that the accuracy of the calculation result of the driving amount (particularly, the defocus amount) may decrease. However, according to the present embodiment, the camera body 2 includes information related to the reliability of the position information in the hot line data 90. For example, the camera body 2 does not use low-reliability position information when calculating the drive amount. Does not output a focus drive instruction based on the focus detection pixel signal accumulated when receiving the hot line data 90 indicating that the focus detection data accumulated when receiving the hot line data 90 indicating a decrease in reliability is received. Appropriate measures can be taken, such as outputting a focus drive instruction with information indicating that the focus drive is created based on the pixel signal.

<Explanation of shake correction>
The camera system 1 according to the present embodiment can perform lens-side shake correction by driving the shake correction lens 361b by the lens driving unit 370b and body-side shake correction by driving the imaging element 260 by the sensor drive unit 265. Is configured. Therefore, for example, it is possible to improve the shake correction effect by performing lens-side shake correction for driving the shake correction lens 361b and performing body-side shake correction for the amount of shake remaining after the lens-side shake correction. In addition, it is possible to improve the shake correction effect by cooperating the lens-side shake correction and the body-side shake correction. When the lens-side shake correction and the body-side shake correction cooperate, the shake state determined by the interchangeable lens 3 is transmitted to the camera body 2 by hot line communication. The matched control can be performed.

As described above, the lens-side control unit 330 determines the tripod fixed state, the composition change state, and the composition stable state as the shake state based on the detection signal of the shake sensor 390. Further, the lens control unit 330 and the body-side second control unit 230b can adjust the effect of the shake correction by appropriately changing the threshold and the coefficient according to the shake state.
For example, the movable range of the shake correction lens 361b or the image sensor 260 (hereinafter, referred to as a movable portion) and the frequency band of the shake to be corrected can be changed according to the shake state. In the tripod fixed state, a shake detection signal in a frequency band of several tens of Hz, which is likely to occur when the tripod is fixed, may be extracted and corrected. In the composition change state, the frequency band may be limited to a specific range or the movable range may be reduced so as not to correct the shake of the interchangeable lens 3 intended by the user accompanying the composition change. In the composition stable state, the range of the frequency band may be wider than in the composition change state, and the movable range may be made larger by making the movable range coincide with the mechanical movable range.

The lens-side controller 330 calculates the total shake amount detected on the interchangeable lens 3 side based on the detection signal of the shake sensor 390. The lens-side controller 330 calculates the amount of angular shake based on the detection signal of the angular velocity sensor 390a, calculates the amount of translational shake based on the detection signal of the acceleration sensor 390b, and calculates the total amount of shake using the amount of angular shake and the amount of translational shake. calculate.
The lens-side control unit 330 further reads the image stabilization coefficient at the time when the detection signal is output, and calculates an image plane conversion value based on the total shake amount and the image stabilization coefficient. At this time, the lens-side controller 330 calculates the image plane converted value without considering the drive range (mechanical movable range and control movable range) of the shake correction lens 361b. Here, the mechanical movable range refers to a movable range based on the holding mechanism of the shake correction lens 361b, and the control movable range refers to a movable range limited by user settings and shooting conditions.
The lens-side controller 330 also calculates the amount of movement of the shake correction lens 361b in the X-axis direction and the Y-axis direction in consideration of the mechanical movable range and the control movable range. The movement amount may be calculated as a target coordinate value (target position) in the X-axis direction and the Y-axis direction.
The lens-side control unit 330 that has calculated the movement amount or the target position of the shake correction lens 361b outputs a drive signal to the lens drive unit 370b to drive the shake correction lens 361b. The lens driving unit 370b that has received the drive signal moves the shake correction lens 361b in the X-axis and Y-axis directions intersecting the optical axis O, respectively. Further, the lens driving section 370b periodically detects the position of the shake correction lens 361b in the X-axis direction and the Y-axis direction, and outputs the current position to the lens-side control section 330. The lens-side control unit 330 may use the value output from the lens driving unit 370b as it is as the data 92h and 92i, or may use a value obtained by performing an operation such as image plane conversion as the data 92h and 92i.
Further, the lens-side controller 330 calculates the residual shake amount in the X-axis direction and the Y-axis direction based on the difference between the detected current position and the target position of the shake correction lens 361b. The residual shake amount may be calculated based on a difference between the movement amount to the target position calculated by the lens-side control unit 330 and the movement amount calculated from the current position of the shake correction lens 361b. The lens-side control unit 330 calculates an image plane converted value of the residual shake amount using the image stabilization coefficient when the current position of the shake correction lens 361b is detected.

  The body-side second control unit 230b outputs the positional information of the shake correction lens 361b received by the hot line communication, the total shake amount received by the hot line communication, the residual shake amount received by the hot line communication, and the shake sensor 290. A drive signal is generated based on at least one of the detection signals, and output to the sensor drive unit 265. Upon receiving the drive signal, the sensor drive unit 265 moves the image sensor 260 in the X-axis and Y-axis directions intersecting the optical axis O, respectively. The drive amount of the image sensor 260 may be the residual shake amount received by the hot line communication, or may be the drive amount necessary for shake correction calculated by the second body-side control unit 230b. The calculation of the drive amount in the second body-side control unit 230b may be based on the difference between the total shake amount and the shake correction amount received by the hot line communication, or may be based on the output result of the shake sensor 290, It may be based on the output result of the sensor 290 and the information received by the hot line communication. When calculating the drive amount in the second body-side control unit 230b, it is preferable to consider the shake state determined by the interchangeable lens 3 received by the hot line communication.

Hereinafter, an example of the anti-shake operation will be described with reference to FIG. FIG. 11 is a timing chart illustrating the timing during the motion image stabilization. FIG. 11 shows an example in which shake correction is performed while repeatedly performing an operation of capturing a monitor image called a live view image, for example, every 1/60 second.
Before the timing chart of FIG. 11, hot line communication has been started, an instruction to start moving image stabilization has been transmitted from the camera body 2 to the interchangeable lens 3 by command data communication, and driving by the lens driving unit 370b has started. It is assumed that

The camera body 2, for example, performs command data communication with the interchangeable lens 3 each time one accumulation by the image sensor 260 is completed. The body-side first control unit 230a periodically performs command data communication based on the frame rate as indicated by times t43, t44, t47,.... Here, the command data communication performed at times t43, t44, t47,... Is for transmitting and receiving information relating to each storage. For example, the imaging conditions are transmitted from the camera body 2 to the interchangeable lens 3. Then, the focal length and the like are transmitted from the interchangeable lens 3 to the camera body 2. Note that the information transmitted and received by the command data communication and the information transmitted and received by the hotline data communication may partially overlap. Therefore, information (for example, position information of the shake correction lens 361b) used by both the body-side first control unit 230a and the body-side second control unit 230b must be transmitted by both hotline communication and command data communication. It may be. In this case, in the hotline communication, a coordinate value is sent as position information of the shake correction lens 361b, and in the command data communication, a numerical value (difference in coordinate value) indicating the movement amount of the shake correction lens 361b is sent from the viewpoint of the data amount. preferable.
Further, command data communication (for example, a focus drive instruction or the like) not based on the frame rate may be performed between the command data communication at times t43, t44, t47,.

  The lens-side control unit 330 creates hotline data 90 each time based on the cycle of the hotline communication, as indicated by times t41, t42,..., And sends the hotline data 90 to the camera body 2 from the lens-side second communication unit 340b. Send. The body-side second communication unit 240b outputs the hotline data 90 received at times t41, t42,... To the body-side first control unit 230a and the body-side second control unit 230b, respectively.

FIG. 11 shows data 92a to 92d, 92g, and 92l to 92o as an example of the second data 92. In the curves indicating the data 92a to 92d and 92l to 92o, the timing of command data notification is indicated by an arrow, and the timing of hot line communication is indicated by a circle.
Although not shown in FIG. 11, it is assumed that the lens-side controller 330 sets an identifier indicating that each of the data 92h to 92o is valid in the data 92e and 92f. In addition, it is assumed that the lens-side control unit 330 sets an identifier indicating “moving image stabilizing” in the data 92g in FIG.

In FIG. 11, the curves indicating the data 92l to 92o are illustrated with respect to, for example, one axis of the X axis or the Y axis. The residual shake amount indicates the difference between the total shake amount and the shake correction amount in an exaggerated manner (by changing the scale).
When trying to send information of the interchangeable lens 3 to the camera body 2 only by command data communication without using hot line communication, only information at the time point indicated by an arrow can be transmitted. Therefore, even if the total shake amount exceeds the upper limit of the shake correction range from time t48 to t49, the residual shake amount cannot be transmitted to the camera body 2 until time t50 of the next command data communication.
However, in the present embodiment, the information of the interchangeable lens 3 is sent to the camera body 2 by hot line communication. be able to. Therefore, the residual shake amount can be transmitted to the camera body 2 during a period (time t48 to t49) in which the total shake amount exceeds the upper limit of the shake correction range.
With this configuration, the camera body 2 further enhances the shake correction effect by, for example, correcting the remaining shake amount that could not be corrected by the interchangeable lens 3 by the body-side second control unit 230b. Becomes possible.
Further, the body-side second control unit 230b can continuously recognize the shake correction amount or the total shake amount of the interchangeable lens 3 in a short cycle by the hot line communication. Shake correction control can be performed according to the shake amount. For example, the body-side second control unit 230b may perform control to correct the amount obtained by subtracting the shake correction amount of the interchangeable lens 3 from the total body-side shake amount calculated from the detection signal of the shake sensor 290. Control for correcting the amount obtained by subtracting the shake correction amount from the total shake amount in 3 may be performed. Further, the second body-side control unit 230b may determine whether or not the total shake amount of the interchangeable lens 3 matches the total body shake amount calculated from the detection signal of the shake sensor 290. Here, if the camera body 2 does not recognize the shake correction amount of the interchangeable lens 3, the shake correction effect of the interchangeable lens 3 and the shake correction effect of the camera body 2 cancel each other or are excessively corrected. There is also a possibility. However, according to the present embodiment, since the shake correction amount and the total shake amount are transmitted by hot line communication, the camera body 2 and the interchangeable lens 3 can cooperate to enhance the shake correction effect.

Based on the detection signal of the shake sensor 390, the lens-side control unit 330 identifies the identifier indicating the “tripod fixed state” between times t41 and t44, and “the composition stable state” between times t45 and t46 and after time t51. Is set in the data 92a to 92d during the time t47 to t51.
Here, when the shake state is transmitted by the command data communication without being transmitted by the hot line communication, the next command data communication is performed even if the lens-side control unit 30 recognizes the composition stable state as at times t51 to t52. Until time t52, the shake state cannot be transmitted to the camera body 2. Further, even when the lens-side control unit 30 recognizes the composition stable state as at times t45 to t46, the shake state may have changed at the time t47 of the next command data communication. However, in the present embodiment, since the shake state is transmitted by hot line communication, the shake state can be periodically transmitted to the camera body 2 at each time indicated by a circle. Therefore, the change of the shake state detected by the interchangeable lens 3 can be transmitted to the camera body 2 quickly.
With this configuration, the camera body 2 can quickly recognize the shake state detected by the interchangeable lens 3, and a time period during which the shake correction control of the camera body 2 does not match the shake correction control of the interchangeable lens 3 can be shortened. It is possible to reduce it. If the shake correction control of the interchangeable lens 3 does not match the shake correction control of the camera body 2, the shake correction effect of the interchangeable lens 3 does not match the shake correction effect of the camera body 2, and a live view image or the like looks unnatural. There is. However, according to the present embodiment, the effect of the shake correction can be enhanced as described below by matching the shake correction control with the camera body 2 and the interchangeable lens 3.

  For example, it is possible to enhance the shake correction effect by changing the frequency band for shake correction or the movable range of the shake correction movable unit according to the shake state. In addition, the shake correction effect can be further enhanced by matching the shake state between the interchangeable lens 3 and the camera body 2. Further, since the shake state is transmitted from the interchangeable lens 3 to the camera body 2 by hot line communication, the time during which the shake state between the interchangeable lens 3 and the camera body 2 is shifted can be shortened. If the shake state is not transmitted by the hotline communication but the shake state is transmitted from the interchangeable lens 3 to the camera body 2 only by the command data communication, the camera body 2 recognizes the detection result of the shake state on the lens side. The possible time is delayed, and the detection result between the interchangeable lens 3 and the camera body 2 is shifted for a long time, and the user's feeling of use of the finder image and the through image during the shake correction is deteriorated (uncomfortable feeling). However, in the present embodiment, the time during which the shake state of the interchangeable lens 3 and the camera body 2 is shifted can be reduced.

According to the above-described embodiment, the following operation and effect can be obtained.
The interchangeable lens 3 periodically transmits the first information on the position of the moving member and the second information that can be used for calculating the moving amount of the moving member to the camera body 2 by hotline communication. The accuracy of the calculated moving amount can be improved.

  Since the interchangeable lens 3 transmits the first information and the second information to the camera body 2 by one hot line communication, the camera body 2 easily considers the reliability of the first information included in the second information. be able to. Further, since the interchangeable lens 3 is represented by an identifier indicating whether the position information is valid or invalid as the reliability of the first information, the identifier can be easily selected. In addition, the interchangeable lens 3 can easily transmit the interchangeable lens 3 to the camera body 2 by hotline communication, indicating that the optical performance of the imaging optical system 360 may be reduced. The camera body 2 considers the second information together with the first information, does not use the low-reliability first information, indicates that the driving instruction signal is generated from the low-reliability first information, and the like. It is possible to take action.

  The interchangeable lens 3 can include a plurality of types of information as the second information in the hotline data 90, and can appropriately select the number and types of information that can be notified to the camera body 2 by hotline communication. Since the camera body 2 can receive a plurality of pieces of information in one hotline communication, it is not necessary to consider the timing of acquiring each piece of information as compared with a case where a plurality of pieces of information are received in a plurality of communications, and the camera body 2 can be easily moved. Control is possible.

  The interchangeable lens 3 can include information on a plurality of moving members in one hot line data 90. For example, the interchangeable lens 3 can store the position information of the focusing lens 361a and the position information of the shake correction lens 361b in one hot line. It can be transmitted to the camera body 2 by communication.

  Since the interchangeable lens 3 outputs the HCLK signal of the hot line communication together with the HDATA signal, the interchangeable lens 3 can take the initiative in performing the hot line communication. Further, since the camera body 2 outputs the CLK signal of the command data communication together with the DATAB signal, it is possible to take the initiative in the command data communication. Therefore, each of the camera body 2 and the interchangeable lens 3 can take the initiative of two independent communication systems.

  The interchangeable lens 3 periodically transmits the information on the position of the shake correction lens 361b and the information on the total shake amount calculated by the interchangeable lens 3 to the camera body 2, thereby canceling the camera body 2 and the shake correction effect. Fitting can be suppressed.

  The interchangeable lens 3 can also transmit the coordinates in the X-axis direction and the Y-axis direction intersecting with the optical axis O output from the lens driving unit 370b as information on the position of the shake correction lens 361b. Can be reduced.

The interchangeable lens 3 can also transmit at least one of information on the position of the shake correction lens 361a, the shake correction amount, the total shake amount, and the residual shake amount in terms of an image plane conversion value. Can also be suppressed.
Further, all information included in one hot line data 90 can be converted into an image plane by the interchangeable lens 3. It is possible to prevent the image plane conversion using the coefficient.

The lens-side second communication unit 340b can also periodically transmit the hot line data 90 in a shorter cycle than when receiving an instruction from the camera body 2 in command data communication. Regardless, the information used for calculating the moving amount of the moving member can be transmitted immediately.
In addition, the shake sensor 390 can also periodically output a detection signal in a cycle shorter than that of the hot line communication. Need not be considered, and the immediacy of the hot line data 90 can be improved.

  The interchangeable lens 3 can also transmit the reliability of the numerical values (information on position, shake correction amount, total shake amount, residual shake amount) included in the hot line data 90, so that the numerical value and its reliability can be transmitted in one hot line communication. Are transmitted to the camera body 2 in association with each other, so that the camera body 2 can cope with the reliability.

  The interchangeable lens 3 can also transmit the moving state of the moving member, so that the coordination between the accumulation timing of the imaging element 260 of the camera body 2 and the moving timing of the moving member of the interchangeable lens 3 can be improved.

  Since the interchangeable lens 3 periodically transmits the fixed-length hot line data 90 to the camera body 2, the transmission can be repeated at a constant cycle, unlike the case of transmitting variable-length data.

  The present invention is not limited to the contents described above. Other embodiments that can be considered within the scope of the technical concept of the present invention are also included in the scope of the present invention.

(Modification 1)
In the above description, an example in which the DMA function is used in the hot line communication has been described. Instead of using the DMA function, the hot line data 90 may be generated via a CPU. In the first modification, the transmission of the HDATA signal is performed by the lens-side second communication unit 340b, and the generation of the hot line data 90 is performed by the lens-side control unit 330. With this configuration, the hot line communication and the generation of the hot line data 90 can be performed in parallel without using the DMA function. However, the generation of the hot line data 90 is performed during a period not exceeding one cycle of the hot line communication.

(Modification 2)
In the above description, an example in which the body-side control unit 230 is divided into the body-side first control unit 230a and the body-side second control unit 230b has been described, but the body-side first control unit 230a and the body-side second control unit 230b It is also possible to configure as one body-side control unit 230 without being divided into the above. In this case, the body-side control unit 230 may directly control the sensor driving unit 265, and the communication line by the body-side second communication unit 240b may be connected to only one body-side control unit 230.

  In the example of the hot line communication shown in FIG. 14, the data transfer direction of the clock synchronous communication using only the HCLK signal line and the HDATA signal line is one direction from the interchangeable lens 3 to the camera body 2. However, another signal line may be added to enable bidirectional data transfer. Alternatively, the input / output of the HDATA signal line may be configured to be switchable, so that bidirectional data communication may be performed.

  The hot line communication is not limited to the clock synchronous type, but may use UART (start-stop synchronous type communication). Further, in addition to the clock signal line and the data signal line, a handshake signal line or a CS (chip select) signal line is added so that the lens-side control unit 330, the body-side first control unit 230a, and the body-side second control unit The unit 230b may be configured to synchronize the communication start timing.

(Modification 3)
In the camera body 2, the sensor driving unit 265 that drives the imaging element 260 in the direction intersecting the optical axis O is omitted, and the image processing performed by the signal processing unit 270 performs image processing to perform image stabilization. Good. Alternatively, in the camera body 2, the shake correction by the sensor drive unit 265 and the shake correction by the signal processing unit 270 may be performed together.

(Modification 4)
The interchangeable lens 3 and the camera body 2 may be configured to determine the share ratio and share the shake correction. For example, based on the total shake amount calculated in the interchangeable lens 3, a share ratio of shake correction performed between the interchangeable lens 3 and the camera body 2 is determined in advance. The lens-side control unit 330 moves the shake correction lens 361b so as to cancel out a shake amount obtained by multiplying the calculated total shake amount by a ratio shared by the interchangeable lens 3.
On the other hand, the body-side second control unit 230b performs shake correction control so as to cancel out a shake amount obtained by multiplying the total shake amount by a ratio shared by the camera body 2.

According to the fourth modification, by determining the share of the shake correction performed between the interchangeable lens 3 and the camera body 2, the shake correction can be appropriately shared between the interchangeable lens 3 and the camera body 2. .
The sharing of the correction between the interchangeable lens 3 and the camera body 2 may be determined as a sharing ratio, or may be determined as a predetermined correction amount. Further, it may be determined that the camera body 2 corrects a shake exceeding a drive range of the shake correction lens 361b. Further, the controllable driving range of the shake correction lens 361b may be transmitted to the camera body 2 by hot line communication.

(Modification 5)
The interchangeable lens 3 and the camera body 2 may be configured to share the shake correction by the shake component. For example, the interchangeable lens 3 shares the correction of angular shake and a predetermined amount of translational shake, and the camera body 2 shares the shake (roll component) around the optical axis O and the remaining translational shake. The translational shake of the predetermined amount is a correction amount that does not cause a bad effect on the optical performance of the imaging optical system 360. In the case of Modification Example 5, the lens-side control unit 330 may include, in the hotline data 90, data on a shake component that is not shared.

  Since the lens-side control unit 330 and the body-side second control unit 230b each control the shake correction by the shake component, the shake correction can be appropriately shared between the interchangeable lens 3 and the camera body 2.

(Modification 6)
The body-side second control unit 230b performs the shake correction control suitable for the shake state based on the shake state transmitted by the hot line data 90, but is not limited thereto. In this embodiment, since the camera body 2 is also provided with the shake sensor 290, the second body-side control unit 230b may perform shake correction control in consideration of both the hot line data 90 and the detection signal of the shake sensor 290. .

(Modification 7)
The data 91d has been described as including the identifier indicating whether or not the zoom tracking is being performed or the identifier indicating that the movement is being performed with speed priority in the above-described embodiment, but is not limited thereto. As another example when the focusing lens 361a is not at the designed position, the focusing lens 361a is driven for a reason other than the focus adjustment during initialization of the lens driving unit 370a, during an error occurring in the interchangeable lens 3, during focusing processing. While you are there.

(Modification 8)
Although the data 91b has been described in the above embodiment as including a plurality of focusing lenses and including an identifier indicating that there is no reliability during zoom tracking, the present invention is not limited to this. The data 91b may include a numerical value corresponding to the reliability of the data 91a, or may include an identifier indicating whether the position information of one focusing lens is valid or invalid. Further, the lens-side control unit 330 is not limited to the number of focusing lenses, and when the information corresponding to the photographing distance (in the present embodiment, indicated by numerical values from 0 to 255) cannot be determined, the data 91d indicates “invalid. May be included.

DESCRIPTION OF SYMBOLS 1 ... Camera system, 2 ... Camera body, 3 ... Interchangeable lens, 90 ... Hotline data, 91, 92 ... Data, 210 ... Body side mount, 230 ... Body side control part, 235 ... Storage part, 240 ... Body side communication Unit, 265: sensor drive unit, 270: signal processing unit, 310: lens side mount, 330: lens side control unit, 340: lens side communication unit, 350: lens side storage unit, 360: imaging optical system, 370: lens Drive unit, 375 ... Zoom operation ring

Claims (1)

An interchangeable lens that can be attached to and detached from the camera body,
A first clock receiving unit that receives a first clock from the camera body;
A second clock transmitting unit that transmits a second clock to the camera body;
A lens driven by receiving a driving force from the first driving member;
A diaphragm member driven by receiving a driving force from the second driving member;
A receiving unit that receives an instruction synchronized with the first clock from the camera body;
A first transmission unit that periodically transmits the position information of the lens to the camera body in synchronization with the second clock;
A second transmission unit that transmits the state of the aperture member to the camera body in synchronization with the first clock based on the instruction;
Interchangeable lens provided with.

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