JP7172806B2 - camera body and camera system - Google Patents

Description

The present invention relates to camera bodies and camera systems .

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

JP-A-2000-105402

An interchangeable lens according to a first aspect of the present invention is a camera body communicable with the interchangeable lens , comprising: a first clock transmitting section for outputting a first clock signal to the interchangeable lens; and a second clock signal from the interchangeable lens . a transmission unit for transmitting instructions to the interchangeable lens in synchronization with the first clock signal; and position information of the lens included in the interchangeable lens in synchronization with the second clock signal and repeated. and a first receiver for receiving.
A camera system according to a second aspect of the present invention comprises a first clock transmitting section that outputs a first clock signal, a second clock receiving section that receives a second clock signal, and an instruction in synchronization with the first clock signal. and a first receiver for repeatedly receiving signals in synchronization with the second clock signal, a moving member, and a first clock receiver for receiving the first clock signal. a second clock transmitting unit that transmits the second clock signal; a receiving unit that receives the instruction in synchronization with the first clock signal; and an interchangeable lens having a first transmission section that repeatedly transmits in synchronization with a clock signal.

1 is a perspective view illustrating a camera system; FIG. It is a block diagram explaining the principal part structure of a camera system. 4 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens; FIG. 4 is a timing chart illustrating command data communication and hotline communication; FIG. 4 is a diagram illustrating timing of command data communication; FIG. 4 is a diagram illustrating the timing of hotline communication; It is a figure which illustrates the information contained in hotline data. FIG. 5 is a diagram illustrating the relationship between a focusing lens position, a focal length, and a photographing distance; It is a figure which illustrates the information contained in hotline data. FIG. 5 is a diagram illustrating timing of automatic focus adjustment; FIG. 5 is a diagram illustrating timings of anti-vibration operation; FIG. 12(a) is a diagram illustrating movement trajectories of a plurality of focusing lenses, and FIG. 12(b) illustrates a case where the movement trajectory when giving priority to optical performance and the movement trajectory when giving priority to speed partially match. It is a figure to do.

BEST MODE FOR CARRYING OUT THE INVENTION 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 attached to a camera body 2 according to one embodiment of the invention. FIG. 2 is a block diagram for explaining the main configuration of the camera system 1. As shown in FIG. The coupling between the camera body 2 and the interchangeable lens 3 is performed by a bayonet structure of a body-side mount 210 and a 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 physically contact each other and are electrically connected. In FIG. 1, the optical axis O of the interchangeable lens 3 and the X-axis direction and Y-axis direction in the plane intersecting the optical axis O are indicated by arrow lines.

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

A body-side terminal holding portion 220 ( FIG. 3 ) is provided on the annular body-side mount 210 . The body-side terminal holding portion 220 has a plurality of body-side terminals. The plurality of body-side terminals include, for example, an attachment detection terminal that transmits a signal to the camera body 2 indicating that the interchangeable lens 3 is attached to the camera body 2, and an attachment detection terminal that is 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 grounding terminal.

The body-side control section 230 is composed of a microcomputer, its peripheral circuits, and the like. The body-side control section 230 executes control programs stored in the storage section 235 to control each section within the camera body 2 . The body-side control unit 230 includes a body-side communication unit 240, a power supply unit 250, an imaging device 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 attachment detection terminal described above. Connected.
Body-side control unit 230 includes storage unit 235 . The storage unit 235 is controlled to record and read data by the body-side control unit 230 . The storage unit 235 stores control programs and the like executed by the body-side control unit 230 .
Body-side control section 230 includes a first body-side control section 230a and a second body-side control section 230b. The first body-side control unit 230a controls the entire camera body 2, such as image processing, and creates instructions to moving members included in the interchangeable lens 3. The second body-side control unit 230b controls the vibration sensor 290 and sensor driving. It is connected to the unit 265 and mainly controls the shake correction operation in the camera body 2 . Since the body-side second control section 230b mainly controls the sensor driving section 265, it is possible to quickly perform control related to shake correction. The first body-side control unit 230a transmits an instruction regarding shake correction, such as start of shake correction, to the second body-side control unit 230b. Between the first body-side control section 230a and the second body-side control section 230b, mutual 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 . Body side communication section 240 is connected to the communication terminal described above and transmits a signal to body side control section 230 . Body side communication section 240 includes a first body side communication section 240a and a second body side communication section 240b. The first body-side communication section 240a is connected to a terminal for command data communication, which will be described later, and the second body-side communication section 240b is connected to a terminal for hotline communication, which will be described later.
The first body-side communication section 240a is connected to the first body-side control section 230a, and information transmitted from the camera body 2 to the interchangeable lens 3 by command data communication is created by the first body-side control section 230a. The second body-side communication section 240b is connected to the first body-side control section 230a and the second body-side control section 230b. It is transmitted to the unit 230a and the second body-side control unit 230b.

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

The imaging device 260 is a solid-state imaging device such as a CMOS image sensor or a CCD image sensor. The imaging device 260 photoelectrically converts the subject image on the imaging surface 260S according to the control signal from the body-side control section 230 and outputs a signal.
The imaging device 260 has a photoelectric conversion unit for image generation and a photoelectric conversion unit for focus detection. The imaging pixel signals generated by the photoelectric conversion unit for image generation are used by the signal processing unit 270 to generate image data. The detection pixel signal generated by the photoelectric conversion unit for focus detection is used by the signal processing unit 270 for focus detection processing for detecting the imaging 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 signals output from the imaging device 260 to generate image data. The generated image data is recorded in a predetermined file format in a storage medium (not shown) or used for image display by the display unit 285 . Further, the signal processing unit 270 performs predetermined focus detection processing on the detection pixel signal output from the image sensor 260 to calculate the defocus amount. The signal processing section 270 is connected to the body side control section 230 , the imaging element 260 and the display section 285 .

The shake sensor 290 detects shake of the camera body 2 due to camera shake or the like. Shake sensor 290 includes an angular velocity sensor 290a and an acceleration sensor 290b. Shake sensor 290 detects angular shake and translational shake by dividing it into 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. FIG.
Angular velocity sensor 290 a detects angular velocity generated by rotational motion of camera body 2 . The angular velocity sensor 290a detects, for example, rotations around each of the axes parallel to the X-axis, the axis parallel to the Y-axis, and the axis parallel to the optical axis O, and generates a detection signal in the X-axis direction and a detection signal in the Y-axis direction. A signal and a rotation signal about the optical axis O are output to the body-side second control section 230b.
Also, the acceleration sensor 290b detects the acceleration generated by the translational motion of the camera body 2 . The acceleration sensor 290b detects, for example, accelerations in directions parallel to the X-axis and in directions parallel to the Y-axis, respectively, 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 section 230b. Output.
Angular velocity sensor 290a and acceleration sensor 290b can each periodically output a detection signal at a period shorter than the period of hotline communication.

Sensor driver 265 includes, for example, an actuator and a drive mechanism. The sensor driving section 265 moves the imaging device 260 within a plane intersecting the optical axis O based on instructions output from the second body-side control section 230b. By moving the imaging device 260 within the plane intersecting the optical axis O, the blurring of the subject image on the imaging surface 260S of the imaging device 260 is suppressed. The sensor driving section 265 also includes a Hall element for detecting the position of the imaging device 260 in the direction intersecting the optical axis O. FIG.

An operation member 280 including a release button, operation switches, etc. is provided on the exterior surface of the camera body 2 . By operating the operation member 280, the user issues a photographing instruction, a photographing condition setting instruction, and the like. Operation member 280 sends an operation signal according to the user's operation to body-side control section 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, etc., according to an instruction from the body-side control unit 230. FIG.

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

A ring-shaped lens side mount 310 is provided with a lens side terminal holding portion 320 (FIG. 3). The lens-side terminal holding portion 320 has a plurality of lens-side terminals arranged in an arc with the optical axis O as the center. 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 an attachment detection terminal 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 grounding terminal.

The lens-side control section 330 is composed of a microcomputer, its peripheral circuits, and the like. The lens side control section 330 executes control programs stored in the lens side storage section 350 to control each section of the interchangeable lens 3 . The lens side control section 330 is directly or indirectly connected to the lens side communication section 340 , the lens side storage section 350 , the lens drive section 370 , the zoom operation ring 375 , the aperture drive section 380 and the shake sensor 390 .

The lens side storage unit 350 is configured by a nonvolatile storage medium. The lens-side storage unit 350 is controlled by the lens-side control unit 330 to record and read data. The lens-side storage unit 350 stores control programs and the like executed by the lens-side control unit 330, as well as data indicating the model name of the interchangeable lens 3, data indicating the optical characteristics of the imaging optical system 360, and the like. can be done. Examples of the optical characteristics include a vibration reduction coefficient according to the focal length and the photographing distance, and the position of the focusing lens 361a in the direction of the optical axis O according to the focal length and the photographing distance.

The imaging optical system 360 forms a subject image on an imaging plane (imaging plane 260S). The optical axis O of the imaging optical system 360 substantially coincides with the center positions of the lens-side mount 310, the body-side mount 210, and the imaging surface 260S. At least part of the imaging optical system 360 is configured to be movable within the interchangeable lens 3 as a moving member.
The imaging optical system 360 includes, for example, a focusing lens 361a as a moving member, a vibration correction lens 361b as a moving member, a zoom lens 361c as a moving member, and an aperture member 362. FIG. 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. The lens drive units 370 each include an actuator, a drive mechanism, and a position detection unit for the moving member. In this embodiment, position information of each moving member is periodically created by the lens-side control section 330 based on signals from the position detection section and the actuator of the lens driving section 370 . 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 the moving member is being driven to move, the moving direction of the moving member, and whether the moving member is stopped. A movement state, such as whether or not, is periodically recognized. It is possible to make the cycle of generating the position information of the moving member and the cycle of recognizing the moving state of the moving member shorter than the cycle of the hotline communication.

The focusing lens 361a is configured to be movable forward and backward in the direction of the optical axis O by a lens driving section 370a. The focus position of the imaging optical system 360 is adjusted by moving the focusing lens 361a. Driving instructions such as the movement direction, movement amount, and movement speed of the focusing lens 361a may be based on instructions from the body side control section 230. You can also give instructions. When a stepping motor and an origin detector are used for the lens drive unit 370a, the position of the focusing lens 361a can be detected relative to the pulse number (movement amount) of the stepping motor and the detection result of the origin detector. ing. Alternatively, an encoder may be provided instead of the origin detector to detect the position of the focusing lens.
Although one focusing lens 361a is provided in FIG. 2, the focal position of the imaging optical system 360 may be adjusted by moving a plurality of focusing lenses 363 and 364 as shown in FIG. 12(a). In that case, a plurality of lens driving units 370a that drive the focusing lenses 363 and 364 in the optical axis O direction may be provided. In FIG. 12(a), the positions of the focusing lenses 363 and 364 when the photographing distance is infinite from the short focal end W to the long focal end T (focal length W~M~T (W<M<T)) of the zoom are shown as follows. show. In FIG. 12A, the positions of the focusing lenses 363 and 364 are indicated by coordinates of P (numerical value corresponding to the photographing distance, 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 a lens driving section 370b. By moving the shake correction lens 361b, the fluctuation (image blur) of the subject image on the image pickup surface 260S of the image sensor 260 is suppressed. Driving instructions such as the movement direction, movement amount, and movement speed of the shake correction lens 361b may be given from the lens side control section 330. You can also give instructions. 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 drive 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 the plane intersecting 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 positional information of the shake correction lens 361b is represented by the position in the X-axis direction and the position in the Y-axis direction. Note that the interchangeable lens 3 does not have to include the shake correction lens 361b. Also, the interchangeable lens 3 can be controlled so that the position in the plane intersecting the optical axis of the shake correction lens 361b is fixed and the shake correction function is not operated, thereby turning off the shake correction function.

The zoom lens 361c is configured to be movable back and forth in the direction of the optical axis O by means of a lens drive section 370c or a zoom operation ring 375. As shown in FIG. As the zoom lens 361c moves, the focal length of the imaging optical system 360 changes from the short focal point W to the long focal point T. The movement direction, movement amount, movement speed, and the like of the zoom lens 361 c depend on the driving force instructed by the lens-side control section 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 section 370c.

The diaphragm member 362 has a plurality of diaphragm blades as moving members, and the light enters the imaging element 260 by changing the size of the opening formed using the plurality of diaphragm blades (aperture diameter, aperture value). Adjust the amount of light. The aperture drive unit 380 is composed of a motor and an aperture drive mechanism, and the aperture member 362 is configured so that the aperture diameter (aperture value) can be changed by the aperture drive unit 380 or manual operation. The aperture diameter of the diaphragm member 362 is configured to be detectable by an encoder or the like of the diaphragm driving section 380 . Alternatively, the aperture drive unit 380 may be provided with an origin detection unit (photo interrupter PI) using a stepping motor to detect the relative position of the aperture blades. The positional information of the aperture blades as moving members is created as aperture diameters by the aperture drive section 380 and the lens side control section 330 .

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

The shake sensor 390 detects shake of the interchangeable lens 3 due to camera shake or the like. The shake sensor 390 includes an angular velocity sensor 390a and an acceleration sensor 390b. Shake sensor 390 detects angular shake and translational shake by dividing it into an X-axis direction component and a Y-axis direction component.
The angular velocity sensor 390 a detects angular velocity generated by the rotational motion of the interchangeable lens 3 . The angular velocity sensor 390a detects, for example, rotations around the axes parallel to the X-axis and the axes parallel to the Y-axis, respectively, 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.
Also, the acceleration sensor 390b detects acceleration generated by the translational motion of the interchangeable lens 3 . The acceleration sensor 390b detects, for example, acceleration in directions parallel to the X-axis and in directions 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. .
Angular velocity sensor 390a and acceleration sensor 390b can each periodically output a detection signal at a period shorter than the period of hotline communication. Note that the interchangeable lens 3 does not have to include the shake sensor 390 .

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

<Terminal details>
FIG. 3 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3. As shown in FIG. Arrows indicate signal flow.
The body-side terminal holding portion 220 of the body-side mount 210 holds the LDET (B) terminal, the VBAT (B) terminal, the PGND (B) terminal, the V33 (B) terminal, the GND (B) terminal, and the RDY terminal as the body-side terminals. (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal. These eleven 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 order shown in FIG.

A lens-side terminal holding portion 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 terminal. (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal. These eleven lens-side terminals are collectively referred to as a lens-side terminal group. Each terminal of the lens side terminal group is arranged 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, and DATA(L) terminal are used for communication. This terminal is used for command data communication. The HCLK(B) terminal, the HDATA(B) terminal, the HCLK(L) terminal, and the HDATA(L) terminal are communication terminals and are used for hotline communication.

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

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

The DATAB (B) terminal is an output terminal for outputting a data signal (hereinafter referred to as DATAB signal) to the DATAB (L) terminal of the interchangeable lens 3 . In the command data communication, the DATAB signal from the first body side communication section 240a is input to the first lens side communication section 340a.

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

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

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

The LDET (B) terminal is the attachment detection terminal described above. In the camera body 2, the LDET (B) terminal is connected to the body side control section 230 via the resistor R2. The resistor R2 and the body-side control section 230 are connected via the power supply V33 supplied from the power supply section 250 and 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 inside the camera body 2 and becomes the potential of the power supply V33 when the interchangeable lens 3 is not attached. When the interchangeable lens 3 is attached, the ground potential LDET (L) terminal is connected to the pulled-up LDET (B) terminal, and the potential of the LDET (B) terminal is lowered. 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 feeding terminals for feeding electric power to the interchangeable lens 3 . The VBAT (B) terminal supplies driving power to the VBAT (L) terminal. The V33(B) terminal supplies circuit power to the V33(L) terminal. Drive system power is supplied to a lens drive section 370 and a diaphragm drive section 380 including actuators such as motors. Also, the circuit system power is supplied to the lens side control section 330 and the lens side communication section 340 . In this embodiment, the drive system power is greater 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.
In FIG. 3, arrows indicate the direction in which power is supplied and the direction in which signals are transmitted.

<Communication details>
As described above, the first body-side communication unit 240a, the RDY(B) terminal, the DATAB(B) terminal, the CLK(B) terminal, the DATAL(B) terminal, and the first lens-side communication unit 340a, the RDY(L) The command data communication performed using the terminal, DATAB(L) terminal, CLK(L) terminal, and DATA(L) terminal is two-way communication between the camera body 2 and the interchangeable lens 3. An instruction to drive the moving member 3 or an instruction to initialize (command data), or transmission of data requested by the body 2 from the interchangeable lens 3 is performed.
In addition, the hotline is performed using the second body side communication unit 240b, the HCLK (B) terminal, the HDATA (B) terminal, and the second lens side 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 information such as the state of moving members 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 hotline 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. It is also 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 hotline communication even during command data communication. For example, even if command data communication takes longer due to an increase in the amount of data, hotline communication can be performed at the required timing.
Furthermore, the camera body 2 can transmit various instructions and requests to the interchangeable lens 3 at any timing by command data communication even while data is being received by hotline communication. Data can be received from the interchangeable lens 3 at arbitrary timing.

FIG. 4 is a timing chart illustrating command data communication and hotline communication.
After instructing the start of hotline communication by command data communication, the camera body 2 periodically receives data from the interchangeable lens 3 by hotline communication after time t1, for example.
Also, the camera body 2 transmits and receives data to and from the interchangeable lens 3 by command data communication. Specifically, the camera body 2 receives from the interchangeable lens 3 various data that the camera body 2 has instructed to transmit to the interchangeable lens 3 between times t2 and t3 and between times t9 and t10. From time t5 to t6 and from time t12 to t13, the camera body 2 transmits various data to the interchangeable lens 3. Instructions (commands) relating to movement control of moving members, such as aperture driving instructions and focus driving instructions, are sent to the interchangeable lens 3 .

In the present embodiment, command data communication includes many types of data to be transmitted and received, and the frequency of instructions to the interchangeable lens 3 is also high. In addition, depending on the type of data, the time required for transmission/reception becomes long. longer than the time to send the indication at t7, t8 and t11.

The interchangeable lens 3, for example, in response to an information request instruction from the camera body 2 sent by command data communication, transmits data indicating information of the interchangeable lens 3 (focal length, shooting distance, aperture value, AV value, etc.) as command data. It is transmitted to the camera body 2 by communication. The interchangeable lens 3 further receives data indicating camera body 2 information (frame rate, camera body 2 settings, whether moving images are being recorded, etc.) transmitted from the camera body 2 .

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

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

The first lens side communication unit 340a sets the potential of the RDY signal to L level at the start of command data communication (t21). The first body-side communication unit 240a starts outputting the CLK signal 401 when the RDY signal is at L level. The frequency of CLK signal 401 is, for example, 8 MHz. The first body-side communication unit 240a outputs a DATAB signal including a command packet 402 of a predetermined length in synchronization with the clock signal 401. FIG. 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 first body-side communication unit 240a stops outputting the CLK signal (t22).
The command packet 402 includes, for example, data for synchronization, data for identifying what command data communication is, data indicating an instruction from the camera body 2, data indicating the data length of the subsequent data packet 406, communication Data for error checking, etc. are included. Instructions included in the command packet 402 include, for example, instructions for initializing and driving moving members from the camera body 2 to the interchangeable lens 3, instructions for transmitting data from the camera body 2 to the interchangeable lens 3, and the like.
The interchangeable lens 3 may determine whether or not there is a communication error based on whether the value calculated from the received command packet 402 matches the communication error check data included in the command packet 402 .
When the command packet 402 is completely received, the first lens side communication section 340a sets the RDY signal to H level, and the lens side control section 330 starts the first control processing 404 based on the command packet 402 (t22).

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

The first body-side communication unit 240a outputs the DATAB signal including the data packet 406 in synchronization with the CLK signal 405. FIG. Also, the first lens-side communication unit 340a outputs a DATAL signal including a data packet 407 of a predetermined length in synchronization with the CLK signal 405. FIG. Data packets 406 and 407 are indicated 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 first body-side communication unit 240a stops outputting the CLK signal (t24).
Data packets 406 and 407 are m-byte variable length data having the number of data indicated by command packet 402 . The data packets 406 and 407 include synchronization data, data indicating information on the camera body 2, data indicating information on the interchangeable lens 3, data for communication error check, and the like.
A data packet 406 transmitted from the camera body 2 to the interchangeable lens 3 includes data indicating the driving amount of the moving member, data for communicating settings and operating conditions within 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 the model name information of the interchangeable lens 3, data indicating the movement state of the movable member within the interchangeable lens 3, focal length of the interchangeable lens 3, and the like. data on optical properties, etc.
The device on the receiving side (interchangeable lens 3 or camera body 2) determines whether or not the values calculated from the received data packets 406 and 407 match the communication error check data included in the data packets 406 and 407. , the presence or absence of a communication error can be determined.
When the transmission and reception of the data packets 406 and 407 are completed, the first lens side communication section 340a sets the RDY signal to H level, and the lens side control section 330 starts the second control processing 408 based on the data packets 406 and 407. (t24).

(Description of first and second control processing)
Next, an example of the first control processing 404 and the second control processing 408 of command data communication will be described.
For example, assume that the command packet 402 includes an instruction to drive the focusing lens 361a. As the first control process 404, the lens-side control unit 330 generates a data packet 407 indicating that an instruction to drive the focusing lens 361a has been received.

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

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

<Explanation of hotline communication>
Next, hotline communication will be described with reference to FIG. FIG. 6 illustrates the timing of the HCLK and HDATA signals. 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 .

The camera body 2 according to the present embodiment sends an instruction to start hotline communication to the interchangeable lens 3 when it receives the initialization completion signal for all moving members. In other words, the camera body 2 does not send an instruction to start hotline communication until initialization of all moving members is completed. The interchangeable lens 3 also does not transmit data for hotline communication until initialization of all moving members is completed and an instruction to start hotline communication is received. The instruction to start hotline communication includes information regarding hotline communication that has been agreed between the interchangeable lens 3 and the camera body 2 in advance. Regarding hotline communication, for example, the data length (number of bytes) of the HDATA signal transmitted by one hotline communication, the data included in the HDATA signal and its order, the clock frequency of the HCLK signal, and the period (Tinterval in FIG. 6) , communication time in one cycle (Ttransmit in FIG. 6), and the like. This information is called hotline communication generation information. In this embodiment, the frequency of the HCLK signal is 2.5 MHz, the data length of one hotline communication is longer than the command packet 402, the cycle of one hotline communication is 1 millisecond, and the communication time in one cycle is transmission. Less than 75% of the interval, but not limited to this. In addition, as data to be included in the HDATA signal, positional information regarding the moving member is sent. For example, the positional information of the focusing lens 361a and the positional information of the shake correction lens 361b are sent. Note that one hotline communication is data transmission performed in one cycle of hotline communication, and from the hotline communication start instruction to the hotline 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 shooting distance, the aperture value or 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 second lens side communication unit 340b in hotline communication will be described. Upon receiving an instruction to start hotline communication through command data communication before time t31, the second lens side 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 shown as HCLK signals 502, 502', . . . in FIG.

The second lens side communication unit 340b outputs the 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-bytes including 8 bits D0 to D7. A single HDATA signal may include unused bit areas and unused byte areas to provide a fixed length. Predetermined initial values are input to unused bit areas and unused byte areas. The HDATA signals are periodically output from the interchangeable lens 3 in synchronization with the HCLK signals 502, 502', .
When transmission of the HDATA signal is completed (t32), the second lens side communication unit 340b stops outputting the HCLK signal until time t34 when transmission of the next HDATA signal is started. One hotline communication is set from time t31 to t32, and one cycle of hotline communication is set from time t31 to t34. As described above, in the present embodiment, one hotline communication period (t31 to t34) is 1 millisecond, and one hotline communication time (t31 to t32) is less than 75% of one period. is. The second lens side communication unit 340b starts the second hotline communication from time t34.
The second lens side communication unit 340b continues hotline communication periodically until an instruction to end the hotline communication is transmitted from the camera body 2 by command data communication.

The second lens side communication section 340b transmits the HDATA signals 503, 503', . . . The second lens side communication unit 340b uses, for example, a DMA (Direct Memory Access) function to efficiently transfer data stored in a data area of a memory (not shown) as an HDATA signal. The DMA function is a function that automatically accesses data on memory without CPU intervention.

Next, the operation of the second body-side communication unit 240b in hotline communication will be described. In the present embodiment, second body-side communication unit 240b connects the HDATA (B) terminal to the HDATA (B) terminal when the initialization process at the time of power-on is completed, or when it is determined to transmit an instruction to start hotline communication by command data communication. Make the HCLK (B) terminal stand by in a receivable state.
Here, initialization processing will be described. Initialization processing includes initialization processing of the first lens side communication unit 340a and the second lens side communication unit 340b, which are communication units, and initialization of the aperture member 362, the focusing lens 361a, and the shake correction lens 361b, which are moving members. processing is included.
The initialization processing of the moving members of the interchangeable lens 3 (the lens and the aperture member 362 which are driven members that are driven by receiving the driving force) will be described below. In the process of initializing the moving members of the interchangeable lens 3, first, an initialization instruction (initialization start command) for 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 (focusing lens 361a, shake correction lens 361b, diaphragm member 362). Initialization of each moving member is performed by driving each driving unit to drive the moving member so as to pass through the respective origin position. After transmitting the initialization instruction (initialization start command), the camera body 2 transmits to the interchangeable lens 3 an instruction requesting the initialization status (status request command). When the interchangeable lens 3 receives the command packet containing the status request command, it transmits a data packet containing the initialization status of each moving member to the camera body 2 by means of a command signal. With one command signal, the interchangeable lens 3 indicates the initialization status (whether initialization is in progress or has been completed) of each moving member (focusing lens 361a, shake correction lens 361b, aperture member 362). Each is transmitted in an identifiable manner. A moving member whose initialization has been completed is transmitted with an identification signal to the effect that it has been completed. A moving member that is being initialized, that is, that has not yet been initialized, is transmitted with an identification signal to the effect that it is incomplete. The camera body 2 repeats the situation request command at a predetermined cycle until the interchangeable lens 3 sends an identification signal indicating completion of initialization for all moving members. 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 drive instruction received from the camera body 2, the interchangeable lens 3 drives the instructed moving member, and transmits the driving status of the moving member to the camera body 2 by hotline communication.

Returning to the description of the hotline communication with reference to FIG. When transmission of the HDATA signal from the interchangeable lens 3 is started and the reception of the data of a predetermined length is completed (t32) after a predetermined time Error0 has passed (time t33) from the start time t31, the second body side communication unit 240b Determine the received data assuming that the communication was successful. The predetermined time Error0 is a time obtained by adding a margin to the communication time Ttransmit in one cycle, and is set to 80% of one cycle, for example. Even after receiving the HDATA signal once, the second body-side communication unit 240b keeps the HDATA (B) terminal and the HCLK (B) terminal on standby in a receivable state. Signal reception is started (t34).

If the second body-side communication unit 240b does not complete reception of data of a predetermined length within a predetermined time Error 0 after the second lens-side communication unit 340b starts transmitting the HDATA signal, normal communication cannot be performed. discards the data received as an error (communication error).
In hotline communication, it is preferable that the communication time (Ttransmit) in one cycle does not exceed 75% so that communication error processing can be performed between each cycle (between times t33 and 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 at least two types of information, position information of the moving member (hereinafter referred to as first information) and information that can be used to calculate the driving amount of the moving member (hereinafter referred to as second information), for each moving member. can be included. In the case of this embodiment, the hot line data 90 includes first data 91 including first information indicating the position of the focusing lens 361a and second information that can be used to calculate the driving amount of the focusing lens 361a, and the image stabilization lens 361b. and second data 92 including second information that can be used to calculate 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 partly 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. If the interchangeable lens 3 does not have the shake correction lens 361b or if the interchangeable lens 3 does not operate the shake correction function, the hotline data 90 may include the first data 91 and not the second data 92. Predetermined dummy data may be included as the second data 92 . When dummy data is included, the data length of the hotline 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 whether the position information is valid or invalid, an identifier, etc.), the movement state of the moving member, the operation member such as the zoom operation ring 375, etc. At least one operational state is included. The above-described information and situations are expressed in the form of numerical values and identifiers by the lens-side control unit 330 and the second lens-side communication unit 340b, and included in the hotline data 90. FIG. As the first data 91 of the focusing lens 361a, first information indicating the position of the focusing lens 361a and the reliability of the positional information (which indicates the reliability of the positional information) as the second information that can be used to calculate the driving amount of the focusing lens 361a. information, identifiers, etc.) that information or location information is valid or invalid.
Since the hot-run data 90 transmitted in one hotline communication includes at least one each of the first information and the second information, the camera body 2 transmits the first information and the second information in one hotline 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 first information is created in the camera body 2 with the timing at which the second information is created. However, according to this embodiment, since a plurality of pieces of information are sent in one hotline communication, the camera body 2 can easily consider a plurality of pieces of information.
In this embodiment, the position information of the aperture member 362 among the moving members of the interchangeable lens 3 is transmitted to the camera body 2 by command data communication instead of hotline communication. That is, the aperture value or AV value information of the aperture member 362 is transmitted from the interchangeable lens 3 to the camera body 2 by the DATAL signal of command data communication. Since the focusing lens 361a and the shake correction lens 361b have a large amount of movement and frequently move finely, it is preferable to periodically send them by hotline communication. spacing is sufficient. By sending the position information of the diaphragm member 362 by command data communication, the amount of hotline communication data to be sent at one time can be reduced. This makes it possible to speed up hotline communication. From the viewpoint of the amount of data, etc., the command data communication may not include information indicating whether the positional information of the diaphragm member 362 is valid or invalid.

(Description of first data 91)
FIG. 7 is a diagram for explaining information included in the first data 91. As shown in FIG.
The first data 91 includes data 91a regarding the position of the focusing lens 361a as first information. The first data 91 includes, as second information, data 91b regarding the reliability of the data 91a, data 91c regarding the moving state of the focusing lens 361a, data 91d regarding whether or not the focusing lens 361a is at the designed position, and operation data 91d. It includes at least one of data 91e regarding the operation state of the member and data 91f regarding the operation state in response to the focusing drive instruction. Here, the second information is information that can be considered when the camera body 2 creates focus drive instructions. Also, 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 numerical values representing positional information in the direction of the optical axis O of the focusing lens 361a detected by the lens driving section 370a. The position information may be the absolute position of the focusing lens 361a in the direction of the optical axis O, the relative position such as the amount of movement of the focusing lens 361a from the origin in the direction of the optical axis O, or the position of the focusing lens 361a. It may be a shooting distance determined from The data 91a may include a value indicating the current position of the focusing lens 361a, for example, by associating a value from 0 to 255 to each position of the focusing lens 361a from infinity to the closest end at each focal length. The data 91a can also be represented by the number of pulses output from the lens driving section 370a, which is preferable because the creation of the data 91a is facilitated. Further, in the case of having a plurality of focusing lenses 363 and 364, the data 91a in this embodiment is the positional 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. Moreover, there is no need to transmit the number of focusing lenses to the camera body 2, and there is no need to change the control of the camera body 2 according to the number of focusing lenses.

The data 91c relates to the moving state of the focusing lens 361a, and includes an identifier indicating whether or not the focusing lens 361a is moving, an identifier indicating whether or not the focusing lens 361a is movable, and a moving direction of the focusing lens 361a. , and so on.

The data 91d relates to whether or not the focusing lens 361a is at the designed position. For example, an identifier indicating whether or not zoom tracking is being performed; It includes an identifier and the like indicating whether or not the object is moving along the movement trajectory. The designed position of the focusing lens 361 is, for example, the position in the direction of the optical axis O uniquely obtained from the focal length and the photographing distance. In general, the interchangeable lens 3 is designed to achieve desired optical performance by setting the position of the focusing lens 361a in the direction of the optical axis O according to the focal length and the photographing distance. However, when the moving speed of the focusing lens 361a is prioritized over the optical performance, such as zoom tracking or initialization, the focusing lens 361a moves through a position different from the originally set position, and the designed movement trajectory is changed. may have different trajectories. In that case, the optical performance of the interchangeable lens 3 may deteriorate when the focusing lens 361a is not within the designed movement range (for example, the area below L0 in the graph of FIG. 8). Therefore, during zoom tracking, an identifier may be uniformly selected to indicate that the focusing lens 361a is not at the designed position, thereby facilitating selection of the identifier.
The interchangeable lens 3 can transmit by hotline communication whether or not the focusing lens 361a is at the designed position by the data 91d, and the camera body 2 is not at the designed position of the focusing lens 361a. In other words, it is possible to perform processing in consideration of the possibility of deterioration in optical performance.

The data 91b relates to the reliability of the data 91a, which is position information, and includes an identifier indicating whether the data 91a is valid. The body-side control section 230 can know the reliability of the data 91a (positional information) from the data 91b.
Further, 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. Therefore, the reliability of the data 91a is lowered. 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 movement locus of the focusing lens 363 when giving priority to optical performance and the movement locus when giving priority to speed are different. Since they match, they move from P(0, W) to P(0, T) via P(0, M), and the numerical value indicating the position in the direction of the optical axis O remains 0 and does not change. On the other hand, the movement locus of the focusing lens 364 when optical performance is prioritized does not match the movement locus when speed is prioritized. ) to P′(0, T), and the numerical value indicating the position in the direction of the optical axis O changes from 0 to 191 or the like. Then, the focusing lens 363 and the focusing lens 364 do not match in numerical value indicating the position in the direction of the optical axis O, and the shooting distance cannot be defined. In such a case, the lens-side control unit 330 determines the data 91a as the upper and lower limits of the limited range, sets the data 91d as an identifier indicating that a plurality of focusing lenses 363 and 364 are provided and is zoom tracking, and sets the data 91b as the position An identifier indicating that the information (data 91a) is invalid. In this embodiment, when a plurality of focusing lenses 363 and 364 are provided, identifiers indicating invalid position information are uniformly selected from the data 91b during zoom tracking so that the identifiers can be easily selected. is not. For example, as shown in FIG. 12(b), when the movement trajectory when the optical performance is prioritized and the movement trajectory when the speed is prioritized in the focusing 364 partially match, the lens-side control unit 330 controls the focusing lens 363. The identifier of the data 91b may be selected depending on whether or not the numerical value indicating the position in the optical axis O direction matches the numerical value indicating the position of the focusing lens 364 in the optical axis O direction. In this case, it is possible to reduce the number of hotline communications in which the data 91a is determined to be invalid by the data 91b. Moreover, the data 91b may indicate that the data 91a is always valid when the number of focusing lenses 361a is one, regardless of the reliability of the data 91a. In other words, 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 the operation state of operation members such as the zoom operation ring 375. FIG. The operating state of the operating member is represented by an identifier indicating whether or not the operating member is being operated, an identifier indicating the operating direction of the operating member, an identifier indicating the operating speed of the operating 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 direction of the optical axis O. It recognizes 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, it is necessary to perform so-called zoom tracking so as not to change the shooting distance while changing the focal length. FIG. 8 shows the focal length (wide corresponds to 0 and tele corresponds to 5), the shooting distance (infinity corresponds to L0 and close to L4), and the position of the focusing lens 361a in the direction of the optical axis O ( design value). The lens-side storage unit 350 stores a table showing the relationship between the shooting distance and the position of the focusing lens 361a in the direction of the optical axis O for each focal length of 0 to 5. FIG. In this embodiment, the position of the focusing lens 361a in the direction of the optical axis O is represented by a numerical value corresponding to the number of pulses of the lens driving section 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) and P() in FIG. 8 by zoom tracking. 0, 3), . . . In this way, when performing zoom tracking accompanying a zoom operation, there is a possibility that the focusing lens 361a is moved with priority given to speed during zoom tracking. In that case, for example, if the focusing lens 361a is moved so as to pass the straight line connecting P(0,1) and P(0,5) in FIG. The optical performance of the imaging optical system 360 may deteriorate. However, according to this embodiment, the camera body 2 can recognize through hotline communication that the zoom operation is in progress, and can recognize that the focusing lens 361a may not be at the designed position.

The data 91f includes an identifier indicating whether the interchangeable lens 3 is executing the driving instruction, an identifier indicating whether the interchangeable lens 3 is ready to receive the driving instruction, and an identifier indicating whether the interchangeable lens 3 is in a state capable of receiving the driving instruction. It is represented by an identifier indicating whether or not the interchangeable lens 3 has completed execution of the drive instruction. In the present embodiment, an identifier indicating a reception disabled state in which a drive instruction cannot be uniformly executed is selected during zoom tracking, but this is not the only option. According to the present embodiment, the camera body 2 can recognize completion of execution of the drive instruction through hotline communication at a fast cycle, and can quickly perform processing after the completion of execution. For example, in the case of a focus driving instruction, the processing after the completion of the execution includes processing for notifying the user that the subject is in focus after the driving instruction. The user quickly recognizes that the subject is in focus and presses the shutter It is possible to prevent missing a chance.
Also, the data 91 may include an ID number or the like for recognizing the drive instruction transmitted by the camera body 2 . If the interchangeable lens 3 is driven and controlled based on a drive instruction from the camera body 2, the data 91 may include the ID number or the like included in the command packet 402 of the drive instruction. Even when the camera body 2 periodically transmits the same kind of driving instruction such as a focus driving instruction, it is transmitted to the camera body 2 at what timing the interchangeable lens 3 is operated based on the output driving instruction. It is possible.

(Description of the second data 92)
FIG. 9 is a diagram illustrating information included in the second data 92. As shown in FIG.
The second data 92 includes, for example, data 92h to 92k regarding the amount of shake correction in the interchangeable lens 3, data 92l and 92m regarding the amount of shake of the subject image on the imaging surface 260S calculated by the interchangeable lens 3, and data detected by the shake sensor 390. data 92n, 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; at least one of data 92e and 92f relating to and data 92g relating to the movement state of the shake correction lens 361b.

Data 92 a to 92 d include identifiers selected by lens-side control section 330 based on detection signals from shake sensor 390 regarding shake states detected by shake sensor 390 . The lens-side control section 330 determines the shake state from the detection signal of the shake sensor 390 . In this 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 camera 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 stable, and an identifier indicating whether the tripod is fixed. Send. Further, 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.
Data 92 a indicates the shake state regarding the angular shake in the X-axis direction output by the shake sensor 390 . For example, based on the angular shake detection signal in the X-axis direction, the lens-side control unit 330 generates an identifier indicating whether the composition is being changed, an identifier indicating whether the composition is stable, an identifier indicating whether the tripod is fixed, are respectively selected and set as data 92a.
The data 92b differs from the data 92a in that the determination is made in the Y-axis direction.
The data 92c differs from the data 92a in that the above determination is made for the translational shake.
The data 92d differs from the data 92a in that the determination is made for translational shake in the Y-axis direction.
The body-side control section 230 can know the determination result of the shake state in the interchangeable lens 3 from the data 92a to 92d. Therefore, the body-side control section 230 can perform shake correction control in accordance with the determination result of the interchangeable lens 3 regarding the shake state. Note that the body-side control unit 230 may also 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. Also good.

The data 92g includes an identifier selected by the lens-side control section 330 based on the shake control state of the interchangeable lens 3 regarding the movement state of the shake correction lens 361b. In this embodiment, the shake control state includes still image stabilization, moving image stabilization, non-shake correction, and the like. The term “non-shake correction” refers to a state in which the lens drive unit 370b is not driven and shake correction is not being performed. “Still image stabilization is 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. "During motion image stabilization" refers to a state in which shake correction suitable for capturing a motion image or capturing a live view image is being performed based on a motion 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 motion image stabilization than during still image stabilization.
The body-side control unit 230 can know the moving state of the shake correction lens 361b from the data 92g, and can reflect it in shake correction control in the body-side control unit 230. FIG.

The data 92h to 92k relate to the amount of shake corrected by the interchangeable lens 3 (shake correction amount). A numerical value indicating the amount of movement of the shake correction lens 361b calculated from the position of 361b is represented.
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 coordinate values in the X-axis direction detected in the interchangeable lens 3 converted into coordinate values (image plane conversion values) on the imaging plane 260S of the imaging element 260. FIG. 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 vibration reduction coefficient. The vibration reduction coefficient indicates the amount of movement of the image plane on the imaging surface 260S with respect to the unit movement amount of the shake correction lens 361b. etc. is stored. The lens-side control unit 330 reads from the lens-side storage unit 350 the vibration reduction coefficient corresponding to the focal length and the shooting distance when the coordinate values of the shake correction lens 361b are detected, and calculates the image plane conversion value.
By calculating the image plane conversion value with the interchangeable lens 3, there is an effect that it is not necessary to send the image stabilization coefficient according to the focal length and shooting distance to the camera body 2. It may be transmitted by communication.
The data 92i differs from the data 92h in that the determination is made in the Y-axis direction.
The data 92j differs from the data 94h in that the lens-side control unit 330 is the shake correction amount obtained from the position of the shake correction lens 361b. 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 values representing the position of the shake correction lens 361b as the data 92j without image plane conversion. may be used as the data 92j.
The data 92k differs from the data 92j in that the above determination is made with respect to the Y-axis.
The body-side control section 230 can know the shake amount corrected by the interchangeable lens 3 (shake correction amount) from the data 92h to 92k.

Data 92l and 92m relate to the amount of shake (total amount of shake) of the subject image on the imaging surface 260S calculated by the interchangeable lens 3, and are controlled by the lens based on the detection signal of the shake sensor 390 and the anti-vibration coefficient when the detection signal is output. It is represented by a numerical value calculated by the unit 330 .
The data 92l indicates the total shake amount in the X-axis direction detected by the interchangeable lens 3, converted to the image plane. Image plane conversion is as described above.
The data 92m differs from the data 92l in that the above determination is made with respect to 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 or not the total shake amount has been corrected.

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, it may be omitted from the hotline data 90 when at least one of the shake correction amount or the current position of the shake correction lens 361b and the total shake amount are sent.
The data 92n indicates the amount of residual vibration in the X-axis direction that could not be completely corrected by the interchangeable lens 3, converted to the imaging surface 260S of the imaging device 260. FIG. Image plane conversion is as described above.
The data 92o differs from the data 92n in that the above determination is made with respect to the Y-axis.
The body-side control unit 230 can know the amount of shake remaining even after the shake correction control is performed on the interchangeable lens 3 from the data 92n and 92o. Shake that could not be corrected by the interchangeable lens 3 can be corrected without 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 shake correction amount. Contains identifiers selected based on their reliability (validity). In this embodiment, the data 92e and 92f indicate whether or not the data 92h to 92o are valid, respectively, but this is not the only option.
The body-side control section 230 can know the reliability of the data 92h to 92o from the data 92e and 92f.

<Description of automatic focus adjustment>
An example of automatic focusing with zoom tracking will be described below with reference to FIG. FIG. 10 is a timing chart illustrating the timing of 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 1/60 second, for example.
It is assumed that hotline communication is started before the timing chart of FIG. 10, and hotline data 90 is periodically transmitted from the interchangeable lens 3 to the camera body 2 at times t61, 62, . Also, at time t61 in FIG. 10, it is assumed that the interchangeable lens 3 is executing the focus drive instruction of operation ID2, and the zoom operation ring 375 is being operated by the user. From time t61, the zoom operation ring 375 continues to be rotated and the shooting distance continues to change. At times t65 and t71, an operation signal for the zoom operation ring 375 is output, and the focal length recognized by the lens side control unit 330 changes stepwise. Change. 10, the distance between the subject and the camera body 2 does not change, and the position of the focusing lens 361a in the direction of the optical axis O is adjusted by zoom tracking accompanying the operation of the zoom operation ring 375. FIG. In FIG. 10, the position information of the data 91a is expressed in a numerical range from 0 at the closest end to 255 at the infinite end at each focal length. At time t65, the numerical value of the data 91a changes significantly even if the position of the focusing lens 361a in the direction of the optical axis O does not change.

The reason why the data 91a changes at time t65 in FIG. 10 will be described below with reference to FIG. In FIG. 8, the position of the focusing lens 361a along the optical axis O is shown by associating a value from 0 to 255 with each position of the focusing lens 361a from infinity to the closest end at each focal length. Therefore, the numerical value contained in the data 91a is 0 for P(0,0), P(0,1), . Similarly, for P(4,0), P(4,1), . . . , P(4,5) in FIG.
Assuming that the focusing lens 361a is positioned at the position indicated by P(0, 2) in FIG. 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 changes to 0 corresponding to P(0, 2) in FIG. to 63 corresponding to P(1,1). That is, the lens-side control unit 330 refers to the focal length 1 table 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) where the value of the data 91a corresponds to 0 in order to restore the shooting distance L0 before the zoom operation by zoom tracking. Zoom tracking is performed between times 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 signals output from the imaging device 260 each time accumulation is completed to generate a live view image. In addition, the signal processing unit 270 calculates the defocus amount based on the focus detection pixel signal output from the image sensor 260 each time accumulation is completed. Also, the first body-side control unit 230a calculates the drive 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 hotline communication.
Here, in the present embodiment, when calculating the drive amount based on the focus detection pixel signals output by accumulation up to time t63, transmission is performed by hotline communication indicated by times t61, t62, . . . included in the accumulation time. At least one piece of positional information of the focusing lens 361a (preferably by calculating the average of a plurality of pieces of positional information) is used. In this manner, the driving amount of the focusing lens 361a can be calculated using the positional information of the focusing lens 361a at the time included in the accumulation time, thereby improving the accuracy of focus adjustment. The first body-side control unit 230a sets the driving amount based on the focus detection pixel signals accumulated up to time t63 and the hot line data 90 between times t61 and t63 to operation ID 4 in the command data communication at time t64. is sent as a focus drive instruction. According to the present embodiment, as indicated by times t63, t64, t67, t68, t70, and t73, the first body-side control unit 230a attaches an operation ID to each accumulation and transmits a focus drive instruction. The interchangeable lens 3 starts driving the focusing lens 361a based on the focus drive instruction of the new action ID, and transmits the action ID being executed by hotline communication. Here, 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 focus detection processing from the interchangeable lens 3 . Also, the action ID and action status may be transmitted to the camera body 2 through both command data communication and hotline communication.

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

In general, in automatic focus adjustment processing, if zoom tracking is performed during accumulation, the position of the focusing lens 361a changes, and the accuracy of the calculation result of the drive amount (particularly the defocus amount) may drop. However, according to the present embodiment, the hot line data 90 of the camera body 2 includes information about the reliability of the position information. Do not output a focus drive instruction based on the accumulated focus detection pixel signal when receiving the hot line data 90 indicating the focus detection accumulated when 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 it has been created based on the pixel signal.

<Description 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 image sensor 260 by the sensor driving unit 265. is configured to Therefore, for example, lens side shake correction for driving the shake correction lens 361b is performed, and body side shake correction is performed for the amount of shake remaining after lens side shake correction, thereby improving the shake correction effect. 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 are made to cooperate, the shake state determined by the interchangeable lens 3 is transmitted to the camera body 2 by hotline communication, so the camera body 2 communicates with the interchangeable lens 3 and the shake state. Matched control can be performed.

As described above, the lens-side control unit 330 determines the tripod-fixed state, the composition-changing 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 second body-side control unit 230b can appropriately change the threshold value and the coefficient according to the shake state to adjust the shake correction effect.
For example, it is possible to change the movable range of the shake correction lens 361b or the imaging element 260 (hereinafter referred to as a movable portion) and the frequency band of the shake to be corrected, according to the shake state. In the tripod-fixed state, a vibration detection signal in a frequency band of 10-odd Hz, which is likely to occur when the camera is fixed on a tripod, may be extracted and corrected. In the composition changing 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 due to the composition change. In the composition stable state, the frequency band range may be wider than in the composition changing state, and the movable range may be enlarged by matching the mechanical movable range.

Based on the detection signal of the shake sensor 390, the lens-side controller 330 calculates the total shake amount detected by the interchangeable lens 3 side. The lens-side control unit 330 calculates the angular shake amount from the detection signal of the angular velocity sensor 390a, calculates the translational shake amount from the detection signal of the acceleration sensor 390b, and calculates the total shake amount using the angular shake amount and the translational shake amount. calculate.
Further, the lens-side control unit 330 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 control unit 330 calculates the image plane conversion 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 the movable range based on the holding mechanism of the shake correction lens 361b, and the controllable movable range refers to the movable range limited by user settings and shooting conditions.
The lens-side control unit 330 also calculates the amount of movement of the shake correction lens 361b in the X-axis direction and the Y-axis direction, taking into consideration the mechanical movable range and the controllable movable range. The amount of movement may be calculated as target coordinate values (target positions) in the X-axis direction and the Y-axis direction.
After calculating the movement amount or target position of the shake correction lens 361b, the lens side control unit 330 outputs a drive signal to the lens driving unit 370b to drive the shake correction lens 361b. Upon receiving the drive signal, the lens driving section 370b moves the shake correction lens 361b in the X-axis and Y-axis directions that intersect the optical axis O, respectively. In addition, 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 it to the lens side control section 330 as the current position. The lens-side control section 330 may use the values output from the lens drive section 370b as they are as the data 92h and 92i, or may use the values after calculation such as image plane conversion as the data 92h and 92i.
Furthermore, the lens-side control unit 330 calculates residual shake amounts in the X-axis direction and the Y-axis direction, respectively, based on the detected difference between the current position and the target position of the shake correction lens 361b. The residual shake amount may be calculated from the difference between the amount of movement to the target position calculated by the lens-side control section 330 and the amount of movement calculated from the current position of the shake correction lens 361b. The lens-side control unit 330 calculates the image plane conversion value of the residual shake amount using the image stabilization coefficient when the current position of the shake correction lens 361b is detected.

The second body-side control unit 230b receives the position information of the shake correction lens 361b received through the hotline communication, the total amount of shake received through the hotline communication, the amount of residual shake received through the hotline communication, and the amount of residual shake received through the hotline communication. A drive signal is created based on at least one of the detection signal and output to the sensor drive unit 265 . The sensor drive unit 265 that has received the drive signal moves the imaging element 260 in the X-axis and Y-axis directions that intersect the optical axis O, respectively. The drive amount of the imaging element 260 may be the residual shake amount received via hotline communication, or may be the drive amount required for shake correction calculated by the second body-side control section 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 via hotline 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 hotline 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 through hotline communication.

An example of anti-vibration operation will be described below with reference to FIG. FIG. 11 is a timing chart illustrating timings during moving 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 every 1/60 second, for example.
Before the timing chart of FIG. 11, hotline communication is started, an instruction to start moving image stabilization is transmitted from the camera body 2 to the interchangeable lens 3 by command data communication, and driving by the lens driving section 370b is started. It shall be

For example, the camera body 2 performs command data communication with the interchangeable lens 3 each time the imaging device 260 completes one accumulation. The first body-side 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, . Then, the focal length and the like are transmitted from the interchangeable lens 3 to the camera body 2 . The information transmitted/received by command data communication and the information transmitted/received by hotline data communication may partially overlap. Therefore, information used by both the first body-side control section 230a and the second body-side control section 230b (for example, the positional information of the shake correction lens 361b) should be transmitted by both hotline communication and command data communication. may be In that case, from the viewpoint of the amount of data, sending the coordinate values as the position information of the shake correction lens 361b in the hot line communication and sending the numerical value (difference between the coordinate values) representing the amount of movement of the shake correction lens 361b in the command data communication. preferable.
Also, command data communication (for example, focus drive instruction) that is not based on the frame rate may be performed between each command data communication at times t43, t44, t47, and so on.

As indicated by times t41, t42, . Send. The second body-side communication unit 240b outputs the hotline data 90 received at times t41, t42, . . . to the first body-side control unit 230a and the second body-side control unit 230b.

In FIG. 11, as an example of the second data 92, data 92a-92d, 92g, and 92l-92o are shown. In curves representing data 92a to 92d and 92l to 92o, arrows indicate command data notification timings, and hotline communication timings are indicated by circles.
Although not shown in FIG. 11, the lens-side control unit 330 sets identifiers in the data 92e and 92f indicating that the data 92h to 92o are valid. Also, in FIG. 11, the lens-side control unit 330 sets an identifier indicating that "moving image stabilization is in progress" in the data 92g.

In FIG. 11, curves showing data 92l to 92o are illustrated for one axis of, for example, the X axis or the Y axis. Also, the residual shake amount is indicated by exaggerating (changing the scale) the difference between the total shake amount and the shake correction amount.
When trying to send information of the interchangeable lens 3 to the camera body 2 only by command data communication without using hotline communication, only the information at the time marked with an arrow can be sent. Therefore, even if the total amount of shake exceeds the upper limit of the shake correction range at times t48 to t49, the residual amount of shake 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 hotline communication, so that the information at the time indicated by the circle is sent to the camera body 2 in addition to the time indicated by the arrow. be able to. Therefore, it is possible to transmit the residual shake amount to the camera body 2 during the period (time t48 to t49) in which the total shake amount exceeds the upper limit of the shake correction range.
With this configuration, in the camera body 2, for example, the amount of residual vibration that could not be corrected by the interchangeable lens 3 is corrected by the body-side second control section 230b, thereby further enhancing the effect of vibration correction. becomes possible.
In addition, since 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 period by hotline communication, the shake correction amount or the total shake amount of the interchangeable lens 3 can be continuously recognized. Shake correction control can be performed in accordance with the amount of shake. For example, the body-side second control unit 230b may perform control to correct an 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 may be performed to correct the amount obtained by subtracting the shake correction amount from the total shake amount in 3. Further, the body-side second control section 230b may determine whether or not the total shake amount of the interchangeable lens 3 and the body-side total shake amount calculated from the detection signal of the shake sensor 290 match. Here, if the camera body 2 does not recognize the amount of shake correction by 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 out or are corrected excessively. There is also a possibility that it will be lost. However, according to this embodiment, since the shake correction amount and the total shake amount are transmitted by hotline communication, the camera body 2 and the interchangeable lens 3 can work together to enhance the shake correction effect.

Based on the detection signal of the shake sensor 390, the lens-side control unit 330 sets the identifier indicating the “fixed tripod state” between times t41 and t44, and the “stable composition state” between times t45 and t46 and after time t51. is set in the data 92a to 92d during time t47 to t51.
Here, when the shake state is not transmitted by hot line communication but by command data communication, even if the lens side control unit 30 recognizes the composition stable state as in time t51 to t52, the next command data communication is performed. The shake state cannot be transmitted to the camera body 2 until time t52. Also, even if the lens-side control unit 30 recognizes the stable composition state at times t45 to t46, the shake state may have changed at time t47 of the next command data communication. However, in the present embodiment, since the shake state is sent by hotline communication, it can be periodically sent to the camera body 2 at each point indicated by the circle. Therefore, it is possible to quickly transmit changes in the shake state detected by the interchangeable lens 3 to the camera body 2 .
With this configuration, the camera body 2 can quickly recognize the shake state detected by the interchangeable lens 3, and the shake correction control in the camera body 2 and the shake correction control in the interchangeable lens 3 do not match each other. can be reduced. When the shake correction control of the interchangeable lens 3 and the camera body 2 do not match, the shake correction effect of the interchangeable lens 3 and the shake correction effect of the camera body 2 do not match, and live view images, etc. look unnatural. There is However, according to the present embodiment, by matching the shake correction control between the camera body 2 and the interchangeable lens 3, the effect of shake correction can be enhanced as follows.

For example, it is possible to improve the shake correction effect by changing the frequency band for shake correction and the movable range of the shake correction movable unit according to the shake state. Further, by matching the shake state between the interchangeable lens 3 and the camera body 2, the shake correction effect can be enhanced. Moreover, since the state of vibration is transmitted from the interchangeable lens 3 to the camera body 2 by hotline communication, the time during which the state of vibration differs between the interchangeable lens 3 and the camera body 2 can be shortened. If the camera body 2 does not transmit the vibration state by hotline communication, but transmits the vibration state from the interchangeable lens 3 to the camera body 2 only by command data communication, the camera body 2 recognizes the detection result of the vibration state on the lens side. This delays the time required for detection and increases the amount of time that detection results deviate between the interchangeable lens 3 and the camera body 2, resulting in a decrease in the user's feeling of use (discomfort) for the viewfinder image and the through image during shake correction. However, in the present embodiment, it is possible to reduce the time during which the interchangeable lens 3 and the camera body 2 are out of alignment.

According to the embodiment described above, the following effects are obtained.
Since the interchangeable lens 3 periodically transmits the first information about the position of the moving member and the second information that can be used for calculating the amount of movement of the moving member to the camera body 2 by hotline communication, the camera body 2 can perform the processing. It is possible to improve the accuracy of the movement amount calculation that is used.

Since the interchangeable lens 3 transmits the first information and the second information to the camera body 2 by one hotline 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 uses 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 indicate the possibility that the optical performance of the imaging optical system 360 is degraded by an identifier, and can easily transmit the identifier to the camera body 2 by hotline communication. The camera body 2 considers the second information together with the first information, does not use the unreliable first information, indicates that the driving instruction signal is created from the unreliable 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 type of information that can be notified to the camera body 2 through hotline communication. Since the camera body 2 can receive a plurality of pieces of information through one hotline communication, there is no need to consider the timing of each piece of information acquisition compared to the case where a plurality of pieces of information are received through a plurality of communications, and the camera body 2 can be moved easily. Control is possible.

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

Since the interchangeable lens 3 outputs the HCLK signal for hotline communication together with the HDATA signal, hotline communication can be performed by itself. In addition, since the camera body 2 outputs the CLK signal for command data communication together with the DATAB signal, command data communication can be performed by itself. Therefore, each of the camera body 2 and the interchangeable lens 3 can take the initiative of two independent communication systems.

Since the interchangeable lens 3 periodically transmits information regarding the position of the shake correction lens 361b and information regarding the total shake amount calculated by the interchangeable lens 3 to the camera body 2, the shake correction effect of the camera body 2 is canceled. You can prevent matching.

The interchangeable lens 3 can also transmit the coordinates in the X-axis direction and the Y-axis direction that intersect with the optical axis O output from the lens driving unit 370b as information about the position of the shake correction lens 361b. It is possible to reduce the load for creating

The interchangeable lens 3 can also transmit at least one of the information on the position of the shake correction lens 361a, the amount of shake correction, the amount of total shake, and the amount of residual shake as an image plane conversion value. can also be suppressed.
Further, all the information included in one hotline data 90 can be converted into the image plane by the interchangeable lens 3, and the information included in one hotline data 89 can be subjected to different image stabilization between the interchangeable lens 3 and the camera body 2. It is possible to prevent image plane conversion using coefficients.

The second lens-side communication unit 340b can also periodically transmit the hotline data 90 at a shorter cycle than receiving instructions from the camera body 2 through command data communication, and can change the timing and period of the command data communication. Regardless, the information used to calculate the movement amount of the moving member can be transmitted immediately.
Moreover, the shake sensor 390 can also periodically output a detection signal in a period shorter than that of hotline communication, and the difference between the output timing of the hotline data 90 and the output timing of the detection signal of the shake sensor 390 can be reduced. , and the immediacy of the hotline data 90 can be improved.

Since the interchangeable lens 3 can also transmit the reliability of numerical values (positional information, shake correction amount, total shake amount, residual shake amount) included in the hotline data 90, one hotline communication can transmit the numerical values and their reliability. are associated with each other and transmitted to the camera body 2 so that the camera body 2 can take action according to the reliability.

Since the interchangeable lens 3 can also transmit the moving state of the moving member, it is possible to improve the linkage 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 .

Since the interchangeable lens 3 periodically transmits fixed-length hotline data 90 to the camera body 2, unlike the case of transmitting variable-length data, it is possible to repeat transmission at a constant cycle.

The present invention is not limited to what has been described above. Other aspects conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

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

(Modification 2)
In the above description, an example was described in which the body-side control section 230 was divided into the first body-side control section 230a and the second body-side control section 230b. , and may be configured as one body-side control unit 230. In this case, the body-side control section 230 may directly control the sensor driving section 265, and the communication line by the second body-side communication section 240b may be connected to only one body-side control section 230.

Also, in the example of hotline communication 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, one more signal line may be added to enable bi-directional data transfer. Alternatively, the HDATA signal line may be configured to be switchable between input and output so that bidirectional data communication can be performed.

Hotline communication is not limited to clock synchronous communication, and UART (start-stop synchronous communication) may be used. 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 to control the lens side control section 330, the body side first control section 230a, and the body side second control section 230a. It may be configured to match the timing of communication start with the unit 230b.

(Modification 3)
In the camera body 2, the sensor drive unit 265 for driving the image sensor 260 in the direction intersecting the optical axis O may be omitted, and the image processing performed by the signal processing unit 270 may be used to perform shake correction by moving the image position. good. Alternatively, in the camera body 2, shake correction by the sensor driving section 265 and shake correction by the signal processing section 270 may be performed together.

(Modification 4)
The interchangeable lens 3 and the camera body 2 may be configured to share the shake correction by determining the sharing ratio. For example, the sharing ratio of the shake correction performed by the interchangeable lens 3 and the camera body 2 for the total amount of shake calculated in the interchangeable lens 3 is determined in advance. The lens-side control unit 330 moves the shake correction lens 361b so as to cancel out the shake amount obtained by multiplying the calculated shake amount by the proportion 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 the shake amount obtained by multiplying the ratio of the total shake amount shared by the camera body 2 .

According to Modified Example 4, by determining the sharing ratio of the shake correction performed by 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 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 the shake exceeding the 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 hotline communication.

(Modification 5)
The interchangeable lens 3 and the camera body 2 may share the shake correction depending on the shake component. For example, the interchangeable lens 3 is responsible for angular shake correction and a predetermined amount of translational shake, and the camera body 2 is responsible for shake around the optical axis O (roll component) and the remaining translational shake. The predetermined amount of translational shake means that the amount of correction is kept to a level that does not adversely affect the optical performance of the imaging optical system 360 . In the case of Modified Example 5, the lens-side control unit 330 may include in the hotline data 90 data related to the shake components that are not shared.

Since the lens-side control unit 330 and the second body-side control unit 230b respectively control shake correction based on shake components, shake correction can be shared between the interchangeable lens 3 and the camera body 2 appropriately.

(Modification 6)
Although the body-side second control unit 230b performs shake correction control suitable for the shake state based on the shake state transmitted by the hotline data 90, this is not the only option. In this embodiment, the camera body 2 is also provided with the shake sensor 290, so the body-side second control section 230b may perform shake correction control in consideration of both the hotline data 90 and the detection signal of the shake sensor 290. .

(Modification 7)
Although the data 91d includes an identifier indicating whether or not zoom tracking is being performed and an identifier indicating that speed is prioritized in the movement in the above embodiment, the data 91d is not limited to this. Other examples of when the focusing lens 361a is not at the designed position include the initialization process of the lens driving unit 370a, the occurrence of an error in the interchangeable lens 3, and the focusing lens 361a being driven for reasons other than focus adjustment. While there is, etc.

(Modification 8)
Although the data 91b has been described in the above embodiment as having multiple focusing lenses and including identifiers indicating that it is unreliable during zoom tracking, this is not the only option. The data 91b may include a numerical value corresponding to the reliability of the data 91a, or may include an identifier indicating whether the positional information of one focusing lens is valid or invalid. In addition, the lens-side control unit 330 is not limited to the number of focusing lenses, and when the information corresponding to the shooting distance (indicated by a numerical value of 0 to 255 in this embodiment) cannot be determined, the data 91d indicates "invalid ” may be included.

DESCRIPTION OF SYMBOLS 1... Camera system, 2... Camera body, 3... Interchangeable lens, 90... Hot line data, 91, 92... Data, 210... Body side mount, 230... Body side control part, 235... Storage part, 240... Body side communication Section 265 Sensor driving section 270 Signal processing section 310 Lens side mount 330 Lens side control section 340 Lens side communication section 350 Lens side storage section 360 Imaging optical system 370 Lens drive unit, 375... zoom operation ring

Claims (19)

A camera body capable of communicating with an interchangeable lens ,
a first clock transmission unit that outputs a first clock signal to the interchangeable lens ;
a second clock receiver that receives a second clock signal from the interchangeable lens ;
a transmission unit that transmits an instruction to the interchangeable lens in synchronization with the first clock signal;
a first receiving unit that repeatedly receives the position information of the lens included in the interchangeable lens in synchronization with a second clock signal;
A camera body with 2. The camera body according to claim 1, further comprising a second receiving section that receives the information corresponding to the instruction in synchronization with the first clock signal. 3. The camera body according to claim 2, wherein the second receiving section receives the state of a diaphragm member included in the interchangeable lens . The transmitting unit transmits an instruction requesting an initialization status;
4. The camera body according to claim 2, wherein said second receiving section receives information indicating that said initialization has been completed. The transmission unit transmits an instruction to the interchangeable lens to repeatedly transmit the position information of the lens in synchronization with a second clock signal after receiving the information indicating that the initialization has been completed by the second reception unit. 5. The camera body of claim 4. 6. The camera body according to any one of claims 3 to 5, wherein the transmission section transmits an instruction to change a state of an aperture member provided in the interchangeable lens . The camera body according to any one of claims 1 to 6, wherein the transmission section transmits an instruction to move the lens. The camera body according to any one of claims 1 to 7, wherein the first receiving section receives position information of the lens in the optical axis direction of the interchangeable lens . The camera body according to any one of claims 1 to 8, wherein the first receiving section receives position information of the lens in a direction intersecting the optical axis of the interchangeable lens . 10. The camera body according to any one of claims 1 to 9, wherein the first receiving section receives positional information of the lens and information indicating validity of the positional information of the lens. 11. The camera body according to claim 10, wherein the first receiving section receives the validity of the positional information of the lens each time the positional information of the lens is received. After the transmission unit transmits an instruction to start transmission of the position information of the lens synchronized with the second clock signal, the first reception unit transmits the position information of the lens without requesting the position information of the lens thereafter. 12. A camera body according to any one of claims 1 to 11, which repeatedly receives position-indicating information. a first clock transmission unit that outputs a first clock signal;
a second clock receiver that receives a second clock signal;
a transmission unit that transmits an instruction in synchronization with the first clock signal;
a first receiver that repeatedly receives a signal in synchronization with the second clock signal;
a camera body having
a moving member;
a first clock receiver that receives the first clock signal;
a second clock transmission unit that transmits the second clock signal;
a receiver that receives the instruction in synchronization with the first clock signal;
a first transmission unit that repeatedly transmits the position information of the member in synchronization with the second clock signal based on the instruction;
an interchangeable lens having
A camera system with 14. The camera system according to claim 13, wherein once transmission of the position information of the member is started, the interchangeable lens repeatedly transmits the position information of the member even if the position information of the member is not requested from the camera body. . The interchangeable lens has an optical system,
The interchangeable lens has a second transmission unit that transmits information on the F number of the optical system in synchronization with the first clock signal based on the instruction,
15. The camera system according to claim 13 or 14, wherein said camera body has a second receiver that receives information on the F-number of said optical system in synchronization with said first clock signal. 16. The camera system according to claim 15, wherein said second transmission section in said interchangeable lens transmits said F-number information when said reception section receives a signal. 17. The camera system according to any one of claims 13 to 16, wherein the first transmission section repeatedly transmits the positional information of the member and the information indicating the validity of the positional information of the member. 16. The camera system of claim 15, wherein said member is a focus lens. 16. The camera system of claim 15, wherein said member is a motion compensation lens.

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