WO2018221570A1 - カメラ、アクセサリ装置、通信制御方法、コンピュータプログラム、およびカメラシステム - Google Patents

カメラ、アクセサリ装置、通信制御方法、コンピュータプログラム、およびカメラシステム Download PDF

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Publication number
WO2018221570A1
WO2018221570A1 PCT/JP2018/020729 JP2018020729W WO2018221570A1 WO 2018221570 A1 WO2018221570 A1 WO 2018221570A1 JP 2018020729 W JP2018020729 W JP 2018020729W WO 2018221570 A1 WO2018221570 A1 WO 2018221570A1
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WO
WIPO (PCT)
Prior art keywords
communication
camera
accessory
microcomputer
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2018/020729
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English (en)
French (fr)
Japanese (ja)
Inventor
岡田　浩司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Inc filed Critical Canon Inc
Priority to CN202110930680.7A priority Critical patent/CN113691710B/zh
Priority to CN201880035994.7A priority patent/CN110709770B/zh
Publication of WO2018221570A1 publication Critical patent/WO2018221570A1/ja
Priority to US16/697,275 priority patent/US11067874B2/en
Anticipated expiration legal-status Critical
Priority to US17/342,662 priority patent/US11543736B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G02B27/648—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake for automatically maintaining a reference alignment, e.g. in self-levelling surveying instruments
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
    • G03B17/14—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets interchangeably
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
    • H04N23/682—Vibration or motion blur correction
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2206/00—Systems for exchange of information between different pieces of apparatus, e.g. for exchanging trimming information, for photo finishing

Definitions

  • the present invention relates to a camera system including a camera capable of mutual communication and an accessory device such as an interchangeable lens and an adapter.
  • an interchangeable lens type camera system including a camera to which an interchangeable lens can be attached and detached
  • communication is performed for the camera to control the operation of the interchangeable lens and for the interchangeable lens to provide the camera with data necessary for its control and imaging.
  • smooth lens control is required in accordance with the imaging cycle, so the camera's imaging timing and the interchangeable lens's control timing are synchronized. It is necessary to take Therefore, the camera needs to complete the reception of data from the interchangeable lens and the transmission of commands such as various instructions and requests to the interchangeable lens within the imaging cycle.
  • communication of a large amount of data at higher speed is required.
  • an adapter such as a wide converter or a teleconverter (extender) may be connected between the camera and the interchangeable lens, and these adapters communicate with the camera in the same manner as the interchangeable lens.
  • the camera system requires a communication system in which the camera can perform one-to-many communication with a plurality of accessory devices including an interchangeable lens and an adapter.
  • an I2C communication method disclosed in Non-Patent Document 1.
  • the address of the communication slave that can be specified by the I2C bus is fixed for each communication slave or selected by the user from a slight width (about several bits). In any of these cases, the communication master needs to recognize in advance the addresses of a plurality of communication slaves connected thereto.
  • the camera that is the communication master knows in advance how many accessory devices (for example, new devices to be used) are connected. It may not be possible. In this case, it is assumed that there are addresses 0 to n that can be assigned to the communication slave. A camera whose type and number of connected accessory devices are unknown performs authentication communication for authenticating (confirming) the accessory device for all addresses from 0 to n including addresses where no accessory device exists. There is a need. As a result, it takes a long time for authentication communication, and the start of imaging by the camera system is delayed.
  • the present invention provides a camera, an accessory device, a communication control method, a communication control program, and a camera system that allow a camera to which a plurality of accessory devices are connected to perform authentication communication with all accessory devices in a short time. To do.
  • a camera is a camera that can be used in a state in which a plurality of accessory devices are connected, and a signal transmission channel used for transmitting a signal between the camera and the plurality of accessory devices;
  • a camera control unit configured to control communication with the plurality of accessory devices using a data communication channel used for data communication between the camera and the plurality of accessory devices;
  • the camera control unit uses a data communication channel to perform first communication that is data communication with a plurality of accessory devices, and second communication that is individual data communication with a specific accessory device among the plurality of accessory devices.
  • Each time a signal indicating waiting for the first communication output to the signal transmission channel from one accessory device that is not authenticated by the camera among the plurality of accessory devices is detected.
  • Each of the plurality of accessory devices is sequentially authenticated by performing authentication communication with the one accessory device.
  • An accessory device is an accessory device of a plurality of accessory devices that is connected to a camera that can be used in a state in which the plurality of accessory devices are connected.
  • Control for controlling communication with the camera using a signal transmission channel used for signal transmission between the accessory device and a data communication channel used for data communication between the camera and a plurality of accessory devices Part.
  • the accessory control unit uses a data communication channel to perform first communication for performing data communication including reception of data transmitted from the camera to the plurality of accessory devices, and second communication for performing data communication with the camera individually. If the camera is not authenticated, a signal indicating that the first communication is on standby is output to the signal transmission channel, and the camera that detected the output and the accessory device are authenticated by the camera. The authentication communication is performed.
  • a camera communication control method is a camera that can be used in a state in which a plurality of accessory devices are connected, and is used to transmit signals between the camera and the plurality of accessory devices.
  • the camera uses a data communication channel to perform first communication that is data communication with a plurality of accessory devices, and second communication that is individual data communication with a specific accessory device among the plurality of accessory devices. And allowing the camera to detect a signal indicating standby of the first communication output to the signal transmission channel from one accessory device that is not authenticated by the imaging device of the plurality of accessory devices.
  • Each of the plurality of accessory devices by performing authentication communication with the one accessory device each time a signal indicating standby is detected. It is characterized by sequentially authenticating.
  • the communication control method for an accessory device is connected to a camera that can be used with a plurality of accessory devices connected, and signal transmission between the camera and the plurality of accessory devices.
  • the accessory device may perform first communication including reception of data transmitted from the camera to the plurality of accessory devices and second communication that is individual data communication with the camera, using the data communication channel. Yes, if the accessory device is not authenticated by the camera, the signal transmission channel outputs a signal indicating that the first communication is waiting, the camera that detected the output, and the accessory device authenticated to the camera And a step of performing authentication communication for making it happen.
  • a communication control program as a computer program that causes a computer of a camera or an accessory device to execute processing according to the communication control method also constitutes another aspect of the present invention.
  • the camera system is a camera system having a plurality of accessory devices and a camera that can be used in a state where the plurality of accessory devices are connected.
  • the camera uses a data communication channel used for data communication between the camera and the plurality of accessory devices, and performs first communication that is data communication with the plurality of accessory devices, and a specific accessory among the plurality of accessory devices.
  • a camera control unit capable of performing second communication, which is individual data communication with the device, and each of the plurality of accessory devices includes the first communication and the second communication with the camera control unit.
  • the accessory control unit of one accessory device that has an accessory control unit capable of performing communication and is not authenticated by the camera among the plurality of accessory devices indicates that the signal transmission channel is waiting for the first communication.
  • the camera control unit outputs a signal and detects a signal indicating standby, the camera control unit performs authentication communication with the one accessory device. Characterized in that it sequentially authenticate, respectively.
  • authentication communication for all accessory devices can be performed in a short time.
  • FIG. 1 is a block diagram showing a configuration of a camera system in Embodiment 1 of the present invention.
  • 1 is a diagram illustrating a communication circuit of a camera (camera microcomputer), an interchangeable lens (lens microcomputer), and an adapter (adapter microcomputer) in Embodiment 1.
  • FIG. FIG. 3 is a diagram illustrating a communication format in the first embodiment.
  • FIG. 3 is a diagram illustrating communication waveforms in broadcast communication according to the first embodiment. The figure which shows the communication waveform in the P2P communication in Example 1.
  • FIG. The figure which shows the communication waveform at the time of communication mode switching in Example 1.
  • FIG. 3 is a flowchart illustrating camera processing in broadcast communication according to the first exemplary embodiment.
  • FIG. 5 is a flowchart illustrating processing of an interchangeable lens and an adapter in broadcast communication according to the first exemplary embodiment.
  • 3 is a flowchart illustrating processing of a camera in P2P communication according to the first embodiment.
  • 5 is a flowchart showing processing of an interchangeable lens and an adapter in P2P communication in Embodiment 1.
  • FIG. 6 is a diagram illustrating communication waveforms in authentication communication processing according to the first embodiment.
  • 5 is a flowchart illustrating authentication communication processing according to the first embodiment.
  • FIG. 10 is a diagram showing a communication waveform in authentication communication processing in the second embodiment. 10 is a flowchart illustrating authentication communication processing according to the second embodiment. The figure explaining another communication channel.
  • FIG. 1 shows the configuration of a camera system that includes a camera 200 that is Embodiment 1 of the present invention, an interchangeable lens 100 that is an accessory device, and an intermediate adapter device (hereinafter simply referred to as an adapter) 300.
  • an adapter 300 an intermediate adapter device
  • the camera 200 that can be used in a state where the interchangeable lens 100 is connected via the adapter 300 (a state where a plurality of accessory devices are connected) is shown.
  • FIG. 1 shows a camera system in which one adapter 300 is connected between the camera 200 and the interchangeable lens 100 as an example, a plurality of adapters may be connected and connected between the camera 200 and the interchangeable lens 100. .
  • communication is performed between the camera 200, the interchangeable lens 100, and the adapter 300 using a plurality of communication methods.
  • the camera 200, the interchangeable lens 100, and the adapter 300 transmit control commands and data (information) through their respective communication units.
  • each communication unit supports a plurality of communication methods, and by switching to the same communication method in synchronization with each other according to the type of data to be communicated and the purpose of communication, optimal communication for various situations A method can be selected.
  • the interchangeable lens 100 and the adapter 300 are mechanically and electrically connected via a mount 400 that is a coupling mechanism.
  • the adapter 300 and the camera 200 are mechanically and electrically connected via a mount 401 that is a coupling mechanism.
  • the interchangeable lens 100 and the adapter 300 acquire power from the camera 200 via a power terminal portion (not shown) provided on the mounts 400 and 401. Then, it supplies power necessary for the operation of various actuators to be described later, the lens microcomputer 111 and the adapter microcomputer 302.
  • the interchangeable lens 100, the camera 200, and the adapter 300 communicate with each other via a communication terminal unit (shown in FIG. 2) provided on the mounts 400 and 401.
  • the interchangeable lens 100 has an imaging optical system.
  • the imaging optical system includes, in order from the subject OBJ side, a field lens 101, a zoom lens 102 that performs zooming, and a diaphragm unit 114 that adjusts the amount of light. Further, the imaging optical system includes an anti-vibration lens 103 that reduces (corrects) image blur and a focus lens 104 that performs focus adjustment.
  • variable power lens 102 and the focus lens 104 are held by lens holding frames 105 and 106, respectively.
  • the lens holding frames 105 and 106 are guided by a guide shaft (not shown) so as to be movable in the optical axis direction (indicated by a broken line in the figure), and are driven by the stepping motors 107 and 108 in the optical axis direction.
  • the stepping motors 107 and 108 move the zoom lens 102 and the focus lens 104 in synchronization with the drive pulse, respectively.
  • the anti-vibration lens 103 shifts in a direction orthogonal to the optical axis of the imaging optical system, thereby reducing image blur due to camera shake (camera shake or the like).
  • a lens microcomputer (hereinafter referred to as a lens microcomputer) 111 is a lens control unit (accessory control unit) that controls the operation of each unit in the interchangeable lens 100.
  • the lens microcomputer 111 receives a control command and a transmission request command transmitted from the camera 200 via a lens communication unit (accessory communication unit) 112 including a lens communication interface circuit.
  • the lens microcomputer 111 performs lens control corresponding to the control command, or transmits lens data corresponding to the transmission request command to the camera 200 via the lens communication unit 112.
  • the lens microcomputer 111 drives the stepping motors 107 and 108 by outputting drive signals to the zoom drive circuit 119 and the focus drive circuit 120 in response to commands relating to scaling and focusing among the control commands.
  • zoom processing for controlling the zooming operation by the zoom lens 102 and AF (auto focus) processing for controlling the focus adjustment operation by the focus lens 104 are performed.
  • the diaphragm unit 114 includes diaphragm blades 114a and 114b.
  • the state (position) of the diaphragm blades 114a and 114b is detected by the Hall element 115.
  • the output from the Hall element 115 is input to the lens microcomputer 111 via the amplifier circuit 122 and the A / D conversion circuit 123.
  • the lens microcomputer 111 outputs a drive signal to the aperture drive circuit 121 based on the input signal from the A / D conversion circuit 123 to drive the aperture actuator 113. Thereby, the light quantity adjustment operation by the diaphragm unit 114 is controlled.
  • the lens microcomputer 111 receives a vibration-proof actuator (voice coil motor) via a vibration-proof drive circuit 125 in accordance with camera shake detected by a shake sensor (not shown) such as a vibration gyro provided in the interchangeable lens 100. Etc.) 126 is driven. As a result, an image stabilization process for controlling the shift operation (image stabilization operation) of the image stabilization lens 103 is performed.
  • a vibration-proof actuator voice coil motor
  • a vibration-proof drive circuit 125 in accordance with camera shake detected by a shake sensor (not shown) such as a vibration gyro provided in the interchangeable lens 100.
  • Etc. 126 is driven.
  • an image stabilization process for controlling the shift operation (image stabilization operation) of the image stabilization lens 103 is performed.
  • the interchangeable lens 100 has a manual operation ring (hereinafter simply referred to as an operation ring) 130 and a ring rotation detector 131.
  • the ring rotation detector 131 is configured by, for example, a photo interrupter that outputs a two-phase signal according to the rotation of the operation ring 130.
  • the lens microcomputer 111 can detect the rotation operation amount of the operation ring 130 using the two-phase signals. In addition, the lens microcomputer 111 can notify the camera microcomputer 205 of the rotation operation amount of the operation ring 130 via the lens communication unit 112.
  • the adapter 300 is an extender for changing the focal length, for example, and includes a variable power lens 301 and an adapter microcomputer (hereinafter referred to as an adapter microcomputer) 302.
  • the adapter microcomputer 302 is an adapter control unit (accessory control unit) that controls the operation of each unit in the adapter 300.
  • the adapter microcomputer 302 receives a control command and a transmission request command transmitted from the camera 200 via an adapter communication unit (accessory communication unit) 303 including a communication interface circuit.
  • the adapter microcomputer 302 performs adapter control corresponding to the control command, or transmits adapter data corresponding to the transmission request command to the camera 200 via the adapter communication unit 303.
  • the camera 200 includes an imaging device 201 such as a CCD sensor or a CMOS sensor, an A / D conversion circuit 202, a signal processing circuit 203, a recording unit 204, a camera microcomputer (hereinafter referred to as camera microcomputer) 205, and a display unit. 206.
  • the image sensor 201 photoelectrically converts the subject image formed by the imaging optical system in the interchangeable lens 100 and outputs an electrical signal (analog signal).
  • the A / D conversion circuit 202 converts an analog signal from the image sensor 201 into a digital signal.
  • the signal processing circuit 203 performs various image processing on the digital signal from the A / D conversion circuit 202 to generate a video signal.
  • the signal processing circuit 203 also generates focus information indicating the contrast state of the subject image (focus state of the imaging optical system) and luminance information indicating the exposure state from the video signal.
  • the signal processing circuit 203 outputs the video signal to the display unit 206, and the display unit 206 displays the video signal as a live view image used for checking the composition, focus state, and the like.
  • a camera microcomputer 205 serving as a camera control unit controls the camera 200 in response to input from camera operation members such as an imaging instruction switch (not shown) and various setting switches.
  • the camera microcomputer 205 transmits a control command related to a zooming operation of the zoom lens 102 to the lens microcomputer 111 according to an operation of a zoom switch (not shown) via a camera communication unit 208 including a communication interface circuit.
  • the camera microcomputer 205 transmits, via the camera communication unit 208, a control command related to the light amount adjustment operation of the diaphragm unit 114 according to the luminance information and the focus adjustment operation of the focus lens 104 according to the focus information to the lens microcomputer 111.
  • the camera microcomputer 205 transmits a transmission request command for acquiring control information and status information of the interchangeable lens 100 to the lens microcomputer 111 as necessary. Further, the camera microcomputer 205 transmits a transmission request command for acquiring control information and status information of the adapter 300 to the adapter microcomputer 302.
  • the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302 perform communication using signal lines (channels) connected via the communication terminal portions provided in the mounts 400 and 401 described above.
  • a signal line (first signal line: corresponding to a signal transmission channel) CS for transmitting a communication control signal and a signal line (second signal line: data) for communicating data.
  • DATA (corresponding to a communication channel).
  • the signal line CS is connected to the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111. Therefore, the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111 can detect Hi (High) and Low as the state of the signal line CS. Further, the signal line CS is pulled up to a power source (not shown) in the camera 200.
  • the signal line CS can be connected to the ground GND (open drain connection) via the ground switch 1121 in the interchangeable lens 100, the ground switch 2081 in the camera 200, and the ground switch 3031 in the adapter 300.
  • the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111 can turn the signal line CS Low by turning on (connecting) the ground switches 2081, 1121, and 3031, respectively.
  • the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111 can set the signal line CS to Hi by turning off (shut off) the ground switches 2081, 1121, and 3031, respectively.
  • a CS switch (channel switch) 3033 is provided in the adapter 300.
  • the adapter microcomputer 302 can connect and disconnect the signal line CS by switching the CS switch 3033 between the connected state and the disconnected state.
  • the signal output state from the adapter 300 to the signal line CS from the camera side (camera 200 in this embodiment) and the signal output state from the adapter 300 to the signal line CS are the interchangeable lens side (this book). In the embodiment, it is not transmitted to the interchangeable lens 100). That is, the broadcast communication described later cannot be performed from the adapter 300 to the communication slave on the interchangeable lens side. Details of a communication control signal (instruction or notification) transmitted through the signal line CS and its output processing will be described later.
  • the signal line DATA is a single bidirectional data communication line that can be used while switching the data transmission direction.
  • the signal line DATA can be connected to the lens microcomputer 111 via the input / output changeover switch 1122 in the interchangeable lens 100, and can be connected to the camera microcomputer 205 via the input / output changeover switch 2082 in the camera 200. Further, the signal line DATA can be connected to the adapter microcomputer 302 via the input / output changeover switch 3032 in the adapter 300.
  • Each microcomputer includes a CMOS data output unit for transmitting data and a CMOS data input unit for receiving data (none of which is shown). Each microcomputer can select whether the signal line DATA is connected to the data output unit or the data input unit by switching the input / output changeover switch.
  • the input / output changeover switch is set so that the signal line DATA is connected to the data output unit.
  • the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111 each set an input / output switch so as to connect the signal line DATA to the data input unit when receiving data. Details of the input / output switching processing of the signal line DATA will be described later.
  • FIG. 2 shows an example of the communication circuit
  • the signal line CS is pulled down to GND in the camera 200 and can be connected to a power source (not shown) via the ground switch 1121 of the interchangeable lens 100, the ground switch 2081 of the camera 200, and the ground switch 3031 of the adapter 300. Also good.
  • the signal line DATA may be always connected to the data input unit, and the connection / disconnection between the signal line DATA and the data output unit may be switched by a switch.
  • Communication data format Next, the format of communication data exchanged between the camera 200 (camera microcomputer 205), the interchangeable lens 100 (lens microcomputer 111), and the adapter 300 (adapter microcomputer 302) will be described with reference to FIG.
  • This communication data format is common to broadcast communication, which is first communication described later, and P2P communication, which is second communication.
  • P2P communication which is second communication.
  • a communication data format in the case of performing so-called asynchronous communication in which communication speeds used for communication between microcomputers are determined in advance and transmission / reception is performed at a communication bit rate according to the determined will be described.
  • the signal level is maintained at Hi.
  • the signal level is set to Low for one bit period. This one bit period is called a start bit ST.
  • 1-byte data is transmitted in an 8-bit period from the second bit to the ninth bit.
  • the bit arrangement of data starts with the most significant data D7 in MSB first format, continues with data D6, data D5,..., Data D1, and ends with the least significant data D0.
  • 1-bit parity PA information is added.
  • the frame level started from the start bit ST is completed by setting the signal level to Hi during the stop bit SP indicating the end of the transmission data. To do.
  • FIG. 3 shows an example of the communication data format
  • other communication data formats may be used.
  • the bit arrangement of data may be LSB first, 9 bits long, or parity PA information need not be added.
  • the communication data format may be switched between broadcast communication and P2P communication.
  • broadcast communication (first communication) will be described.
  • Broadcast communication is one-to-many communication in which one of the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302 transmits data to the other two at the same time (ie, simultaneous transmission). This broadcast communication is performed using the signal line CS and the signal line DATA.
  • a communication mode in which broadcast communication is performed is also referred to as a broadcast communication mode (first communication mode).
  • FIG. 4 shows signal waveforms in broadcast communication performed between the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • the adapter microcomputer 302 performs broadcast communication to the camera microcomputer 205 and the lens microcomputer 111 in response to broadcast communication from the camera microcomputer 205 to the lens microcomputer 111 and the adapter microcomputer 302 will be described.
  • the camera microcomputer 205 as a communication master starts Low output to the signal line CS in order to notify the lens microcomputer 111 and the adapter microcomputer 302 as communication slaves that broadcast communication is to be started.
  • the camera microcomputer 205 outputs data to be transmitted to the signal line DATA.
  • the lens microcomputer 111 and the adapter microcomputer 302 start Low output to the signal line CS at the timing when the start bit ST input from the signal line DATA is detected. At this time, since the camera microcomputer 205 has already started outputting Low to the signal line CS, the signal level of the signal line CS does not change.
  • the camera microcomputer 205 cancels the low output to the signal line CS when the stop bit SP is output.
  • the lens microcomputer 111 and the adapter microcomputer 302 analyze the received data and perform internal processing associated with the received data. When the preparation for receiving the next data is completed, the Low output to the signal line CS is canceled. As described above, the signal level of the signal line CS becomes Hi when all of the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302 cancel the Low output to the signal line CS.
  • each of the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302 can confirm that the signal level of the signal line CS becomes Hi after releasing the Low output to the signal line CS.
  • Each of the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302 confirms that the signal level of the signal line CS has become Hi, and thus completes the current communication process and is ready for the next communication. Can be judged.
  • the adapter microcomputer 302 when confirming that the signal level of the signal line CS has returned to Hi, the adapter microcomputer 302 outputs Low to the signal line CS in order to notify the camera microcomputer 205 and the lens microcomputer 111 that broadcast communication is to be started. To start.
  • the adapter microcomputer 302 outputs data to be transmitted to the signal line DATA. Further, the camera microcomputer 205 and the lens microcomputer 111 start Low output to the signal line CS at the timing when the start bit ST input from the signal line DATA is detected. Since the adapter microcomputer 302 has already started outputting Low to the signal line CS at this time, the signal level propagated to the signal line CS does not change. After that, the adapter microcomputer 302 cancels the Low output to the signal line CS when it finishes outputting the stop bit SP. On the other hand, after receiving up to the stop bit SP input from the signal line DATA, the camera microcomputer 205 and the lens microcomputer 111 perform analysis of the received data and internal processing associated with the received data. Then, after preparation for receiving the next data is completed, the Low output to the signal line CS is canceled.
  • the signal transmitted through the signal line CS in the broadcast communication functions as a signal indicating the start (execution) and execution of the broadcast communication.
  • FIG. 4 shows an example of broadcast communication
  • the data transmitted in one broadcast communication may be 1-byte data as shown in FIG. 4, but may be 2-byte or 3-byte data.
  • Broadcast communication may be one-way communication from the camera microcomputer 205 serving as a communication master to the lens microcomputer 111 and adapter microcomputer 302 serving as communication slaves.
  • P2P communication Next, P2P communication performed between the camera 200 (camera microcomputer 205), the interchangeable lens 100 (lens microcomputer 111), and the adapter 300 (adapter microcomputer 302) will be described.
  • the camera 200 as the communication master designates (selects) one interchangeable lens 100 (specific accessory device) to communicate from the interchangeable lens 100 as the communication slave and the adapter 300, and data is transmitted only to the designated communication slave. Is one-to-one communication (individual communication).
  • This P2P communication is also performed using the signal line CS and the signal line DATA.
  • a communication mode in which P2P communication is performed is also referred to as a P2P communication mode (second communication mode).
  • FIG. 5 shows, as an example, signal waveforms of P2P communication exchanged between the camera microcomputer 205 and the lens microcomputer (specific accessory device) 111 designated as a communication partner.
  • the lens microcomputer 111 transmits 2-byte data to the camera microcomputer 205. Processing for switching between communication modes (broadcast communication mode and P2P communication mode) and processing for specifying a communication partner in P2P communication will be described later.
  • the camera microcomputer 205 as a communication master outputs data to be transmitted to the lens microcomputer 111 to the signal line DATA.
  • the camera microcomputer 205 starts Low output (standby request) to the signal line CS after completing the output of the stop bit SP.
  • the camera microcomputer 205 cancels the Low output to the signal line CS.
  • the lens microcomputer 111 analyzes the received data input from the signal line DATA and performs internal processing associated with the received data. Thereafter, when it is confirmed that the signal level of the signal line CS has returned to Hi, the lens microcomputer 111 outputs data to be transmitted to the signal line DATA continuously for 2 bytes.
  • the lens microcomputer 111 starts outputting Low to the signal line CS after completing the output of the stop bit SP of the second byte. Thereafter, when the lens microcomputer 111 is ready to receive the next data, the lens microcomputer 111 cancels the Low output to the signal line CS.
  • the adapter microcomputer 302 that is not designated as a communication partner for P2P communication does not output signals to the signal line CS and the signal line DATA.
  • the signal transmitted through the signal line CS in the P2P communication functions as a notification signal indicating the end of data transmission and a standby request for the next data transmission.
  • FIG. 5 shows an example of P2P communication
  • data may be transmitted one byte at a time using the signal line DATA, or data of 3 bytes or more may be transmitted. May be.
  • Communication mode switching processing and communication partner designation processing Next, a communication mode switching process and a communication partner designation process in P2P communication will be described with reference to FIG.
  • FIG. 6 shows signal waveforms at the time of communication mode switching and communication partner designation exchanged between the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • the communication partner of P2P communication is designated by broadcast communication.
  • the adapter microcomputer 302 is designated as the communication partner of the P2P communication from the camera microcomputer 205, and the 1 byte data P2P communication from the camera microcomputer 205 and the 1 byte data P2P communication from the adapter microcomputer 302 are executed. Will be explained.
  • the lens microcomputer 111 is designated as the communication partner of the P2P communication from the camera microcomputer 205, and P2P communication of 2-byte data from the camera microcomputer 205 and P2P communication of 3-byte data from the lens microcomputer 111 are executed.
  • the camera microcomputer 205 which is a communication master executes broadcast communication according to the procedure described in FIG. What is notified by this broadcast communication is slave designation data for designating a partner to communicate with the camera microcomputer 205 in the next P2P communication.
  • the adapter microcomputer 302 since the adapter microcomputer 302 is designated as the communication partner, in the next P2P communication, data is transmitted and received between the camera microcomputer 205 and the adapter microcomputer 302 according to the procedure described in FIG.
  • 1-byte data is transmitted from the camera microcomputer 205 to the adapter microcomputer 302, and then 1-byte data is transmitted from the adapter microcomputer 302 to the camera microcomputer 205.
  • the camera microcomputer 205 can again designate a communication partner to communicate by P2P communication by broadcast communication.
  • the lens microcomputer 111 is set as slave designation data, and broadcast communication is executed according to the procedure described in FIG.
  • the adapter microcomputer 302 ends the P2P communication, and at the same time, the communication mode of the camera microcomputer 205 and the lens microcomputer 111 is switched to the P2P communication mode. If broadcast communication is not executed here, P2P communication between the camera microcomputer 205 and the adapter microcomputer 302 is continued.
  • next P2P communication data is transmitted and received between the camera microcomputer 205 and the lens microcomputer 111 according to the procedure described in FIG.
  • the camera microcomputer 205 transmits 2-byte data to the lens microcomputer 111, and then the lens microcomputer 111 transmits 3-byte data to the camera microcomputer 205.
  • step S100 When an event for starting broadcast communication occurs in step S100, the camera microcomputer 205 turns on (connects) the ground switch 2081 to set the signal line CS to low in step S101. Thereby, the start of broadcast communication is notified to the lens microcomputer 111 and the adapter microcomputer 302.
  • the lens microcomputer 111 and the adapter microcomputer 302 that have detected Low of the signal line CS in step S200 permit data reception from the signal line DATA in step S201.
  • the camera microcomputer 205 operates the input / output changeover switch 2082 in step S102 to connect the signal line DATA to the data output unit, and performs data transmission in step S103.
  • the lens microcomputer 111 and the adapter microcomputer 302 detect the start bit of the signal line DATA in step S202, the lens switch 1111 and the ground switch 3031 are turned on (connected) to indicate that communication processing is being performed in step S205. Thereby, the Low output to the signal line CS is started. Thereafter, when it is determined that all data has been received in the lens microcomputer 111, the adapter microcomputer 302, and step S206, data reception from the signal line DATA is prohibited in step S207.
  • step S208 the ground switch 1121 and the ground switch 3031 are turned off (shut off) to indicate that the communication process has ended, and the Low output to the signal line CS is released.
  • the number of bytes of data to be transmitted and received is not limited, and it is sufficient that the recognition is consistent among the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • step S104 the camera microcomputer 205 determines whether the data transmitted in step S103 is a bidirectional command including transmission from the lens microcomputer 111 or the adapter microcomputer 302. If the command is not a bidirectional command, the camera microcomputer 205 turns off (cuts off) the ground switch 2081 in step S105 to release the Low output to the signal line CS, and proceeds to step S116. If it is a bidirectional command, the camera microcomputer 205 operates the input / output changeover switch 2082 in step S106 to connect the signal line DATA to the data input unit. In step S107, the ground switch 2081 is turned off (shut off) to release the Low output to the signal line CS, and the process waits until the signal line CS becomes Hi in step S108.
  • step S209 the lens microcomputer 111 and the adapter microcomputer 302 determine whether the data received in step S206 is a bidirectional command including transmission from itself. If the command is not a bidirectional command, the lens microcomputer 111 and the adapter microcomputer 302 proceed to step S215. If the command is a bidirectional command, the lens microcomputer 111 and the adapter microcomputer 302 wait until the signal line CS becomes Hi in step S210. When the signal line CS becomes Hi, the lens microcomputer 111 and the adapter microcomputer 302 notify the start of broadcast communication by turning on (connecting) the ground switches 1121 and 3031 and setting the signal line CS to low in step S211. To do. When the camera microcomputer 205 detects Low of the signal line CS in step S109, the camera microcomputer 205 permits data reception from the signal line DATA in step S110.
  • the lens microcomputer 111 and the adapter microcomputer 302 operate the input / output changeover switches 1122 and 3032 in step S212 to connect the signal line DATA to the data output unit, and perform data transmission in step S213.
  • the camera microcomputer 205 detects the start bit of the signal line DATA in step S111, the camera microcomputer 205 turns on (connects) the ground switch 2081 to indicate that communication processing is being performed in step S112. Thereby, the Low output to the signal line CS is started.
  • the lens microcomputer 111 and the adapter microcomputer 302 release the Low output to the signal line CS by turning off (shut off) the ground switches 1121 and 3031 in step S214 after transmission of all data is completed.
  • step S113 If the camera microcomputer 205 determines that all data has been received in step S113, it prohibits data reception from the signal line DATA in step S114. In step S115, the camera microcomputer 205 turns off (cuts off) the ground switch 2081 to release the Low output to the signal line CS in order to indicate that the communication process has ended.
  • the number of bytes of data to be transmitted and received is not limited, and it is sufficient that the recognition is consistent among the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • the camera microcomputer 205 waits until the signal line CS becomes Hi in step S116.
  • the camera microcomputer 205 determines in step S117 whether or not the lens microcomputer 111 or the adapter microcomputer 302 has been designated as a communication partner for P2P communication based on the data transmitted in step S103. If the lens microcomputer 111 and the adapter microcomputer 302 are not designated as communication partners, the camera microcomputer 205 ends the process as it is, and if any is designated, the camera microcomputer 205 shifts to the P2P communication mode in step S118.
  • the lens microcomputer 111 and the adapter microcomputer 302 stand by until the signal line CS becomes Hi in step S215.
  • the lens microcomputer 111 and the adapter microcomputer 302 determine whether or not the camera microcomputer 205 has designated the communication partner for P2P communication based on the data received in step S206. If the lens microcomputer 111 and the adapter microcomputer 302 are not designated as communication partners, the process is terminated. If it is designated as the communication partner, the designated microcomputer out of the lens microcomputer 111 and the adapter microcomputer 302 permits data reception from the signal line DATA in step S217, and shifts to the P2P communication mode in step S218.
  • the lens microcomputer 111 and the adapter microcomputer 302 confirm whether or not the signal line CS has become Hi in step S203.
  • the lens microcomputer 111 and the adapter microcomputer 302 prohibit data reception from the signal line DATA in step S204 and end the processing. This is processing for a communication slave not designated as a communication partner of P2P communication to respond to Low output to the signal line CS by P2P communication between the camera microcomputer 205 and another communication slave.
  • FIGS. 8A and 8B show processing performed by the camera microcomputer 205
  • FIG. 8B shows processing performed by a microcomputer (hereinafter referred to as a specific microcomputer) designated as a communication partner of P2P communication among the lens microcomputer 111 and the adapter microcomputer 302.
  • a microcomputer hereinafter referred to as a specific microcomputer
  • step S300 When an event for starting P2P communication occurs in step S300, the camera microcomputer 205 operates the input / output changeover switch 2082 in step S301 to connect the signal line DATA to the data output unit, and performs data transmission in step S302. Thereafter, when all data transmission is completed, the camera microcomputer 205 turns on (connects) the ground switch 2081 in step S303 and starts outputting Low to the signal line CS.
  • the specific microcomputer detects Low of the signal line CS in step S400, it determines that the data transmission from the camera microcomputer 205 is completed, and analyzes the data received from the signal line DATA in step S401.
  • step S304 the camera microcomputer 205 determines whether the data transmitted in step S302 is a bidirectional command including transmission from the specific microcomputer. If it is not a bidirectional command, the camera microcomputer 205 turns off (cuts off) the ground switch 2081 in step S305 to cancel the low output to the signal line CS. In step S306, the process waits until the signal line CS becomes Hi before proceeding to step S311. If the command is a bidirectional command, the camera microcomputer 205 operates the input / output changeover switch 2082 in step S307 to connect the signal line DATA to the data input unit. In step S308, the ground switch 2081 is turned off (shut off) to cancel the low output to the signal line CS.
  • the specific microcomputer determines in step S403 whether the data received in step S401 is a bidirectional command including transmission from itself. If it is not a bidirectional command, the specific microcomputer turns on (connects) and turns off (cuts off) the ground switch (1121 or 3031) in steps S404 and S405. Thereby, the Low output to the signal line CS is started and canceled, and the process proceeds to Step S411.
  • the specific microcomputer operates the input / output changeover switch (1122 or 3032) in step S406 to connect the signal line DATA to the data output unit, and performs data transmission in step S407. Thereafter, when all data transmission is completed, the specific microcomputer starts low output to the signal line CS by turning on (connecting) the ground switch (1121 or 3031) in step S408.
  • step S609 the camera microcomputer 205 determines in step S310 that data transmission from the specific microcomputer has been completed, and analyzes the data received from the signal line DATA.
  • step S409 the specific microcomputer operates the input / output changeover switch (1122 or 3032) to connect the signal line DATA to the data input unit. Thereafter, the specific microcomputer turns off (cuts off) the ground switch (1121 or 3031) in step S410 to cancel the Low output to the signal line CS.
  • the camera microcomputer 205 waits until the signal line CS becomes Hi in step S311. Thereafter, when an event for starting broadcast communication occurs in step S312, the camera microcomputer 205 shifts to the broadcast communication mode in step S313. On the other hand, the specific microcomputer waits until the signal line CS becomes Hi in step S411 and ends the processing.
  • FIG. 9 shows signal waveforms in authentication communication processing performed between the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • the top of the figure shows data communicated by the signal line DATA
  • “Camera” indicates data output by the camera microcomputer 205
  • “Adapter” indicates data output by the adapter microcomputer 302
  • “Lens” indicates lens.
  • Data output from the microcomputer 111 is shown.
  • “CS signal (camera)” indicates a signal output state (hereinafter referred to as a CS signal state) of the signal line CS detected by the camera microcomputer 205
  • CS output (camera)” is output by the camera microcomputer 205 to the signal line CS. Signals are shown.
  • CS signal (adapter) indicates a CS signal state detected by the adapter microcomputer 302
  • CS output (adapter) indicates a signal output from the adapter microcomputer 302 to the signal line CS.
  • CSSW indicates the state of the CS switch 3033 controlled by the adapter microcomputer 302, and Low indicates the connection state.
  • CS signal (lens) indicates a CS signal state detected by the lens microcomputer 111
  • CS output (lens) indicates a signal output from the lens microcomputer 111 to the signal line CS.
  • the flowchart of FIG. 10 shows the flow of authentication communication processing.
  • This authentication communication process is performed in response to the start of power supply from the camera 200 to the interchangeable lens 100 and the adapter 300 in response to detecting the connection of the interchangeable lens 100 by the detection switch (1123) provided in the camera 200.
  • the camera microcomputer 205 transmits an authentication start request command via the signal line DATA by broadcast communication in step S500. That is, authentication start communication is performed.
  • This process is performed as a preprocess for authentication communication by the camera microcomputer 205.
  • the CS switch 3033 is set to the connected state. Note that processing in broadcast communication and P2P communication performed later is as described with reference to FIGS. 7A and 7B and FIGS.
  • the adapter microcomputer 302 and the lens microcomputer 111 are different in the signal line CS (Low) during communication with the camera microcomputer 205 (communication start to end) and communication standby in broadcast communication and P2P communication. And Hi) are output.
  • the adapter microcomputer 302 and the lens microcomputer 111 that have received the authentication start request command perform broadcast communication reception processing in steps S506 and S513, respectively. If the received result is an authentication start request command, the adapter microcomputer 302 switches the CS switch 3033 to a disconnected state in step S507.
  • the timing of this switching is after the adapter microcomputer 302 cancels the low output to the signal line CS (after step S208 in FIG. 7), but may be just before or simultaneously with the low output cancel. Absent.
  • step S501 the camera microcomputer 205 cancels the low output to the signal line CS by the adapter microcomputer 302 and the communication circuit is waiting for communication in step S501.
  • step S501 the camera microcomputer 205 performs an authentication request command via the communication line DATA. Send. That is, authentication request communication is performed.
  • the camera microcomputer 205 performs authentication communication.
  • the authentication request command is slave designation data for designating a communication slave that has received the broadcast request communication as a designated slave (specific accessory device). Since the communication line CS is disconnected by the CS switch 3033 in step S507, the low output to the communication line CS in step S501 is not detected by the lens microcomputer 111.
  • the authentication request command is transmitted to the lens microcomputer 111.
  • the authentication request command is a command premised on broadcast communication in which data can be received only when the communication line CS is Low. For this reason, the lens microcomputer 111 that has received the authentication request command while the communication line CS is Hi ignores this.
  • the adapter microcomputer 302 receives the authentication request command via the communication line DATA by broadcast communication in step S508.
  • the adapter microcomputer 302 that has received the authentication request command has received the authentication request command for the first time. Therefore, it is the slave designation data transmitted to itself, and the next P2P communication is communication addressed to itself.
  • step S502 the camera microcomputer 205 transmits an ID communication request command via the communication line DATA by P2P communication. That is, authentication information communication is performed.
  • the camera microcomputer 205 does not recognize that the communication partner of P2P communication is the adapter microcomputer 302. This is because it is not yet known at this point how many accessories are connected to the camera 200.
  • the camera microcomputer 205 only knows that any of the connected communication slaves responds to the P2P communication by designating the designated slave by the authentication request command transmitted in step S501.
  • step S509 the adapter microcomputer 302 designated as the designated slave receives the ID communication request command by P2P communication, and in response to this, the ID microcomputer (authentication information) is received by the camera microcomputer via the signal line DATA by P2P communication.
  • the adapter microcomputer 302 switches the CS switch 3033 to the connected state in step S510.
  • the switching timing is after the adapter microcomputer 302 cancels the low output to the signal line CS (after step S410 in FIG. 8), but it may be just before or simultaneously with the low output cancel.
  • steps S502 and S509 may be performed only once or between the camera microcomputer 205 and the adapter microcomputer 302 as shown in FIG. 9, or may be performed two or more times.
  • step S509 the timing for switching the CS switch 3033 to the connected state is after step S509 in this flowchart, it may be before step 509 (after reception of the authentication request command in step S508).
  • step S508 the adapter microcomputer 302 that has received the authentication request command by broadcast communication recognizes that it is slave designation data to itself, and the lens microcomputer 111 that has not received the authentication request command has received slave designation data to itself. It is because it does not recognize. For this reason, even if the CS switch 3033 is switched to the connected state after step S508, only the adapter microcomputer 302 responds to the ID communication request command in step S509.
  • the camera microcomputer 205 requests authentication via the communication line DATA again by broadcast communication in step S503.
  • the adapter microcomputer 302 receives the authentication request command in step S511, and further receives the lens microcomputer 111 in step S514.
  • the adapter microcomputer 302 has already finished communication (that is, authentication) in response to the authentication request command and the ID communication request command, the authentication request command is ignored here.
  • the lens microcomputer 111 interprets it as slave designation data for itself and prepares for P2P communication.
  • the camera microcomputer 205 transmits an ID communication request command via the communication line DATA by P2P communication in step S504. Again, the camera microcomputer 205 does not recognize that the other party of the P2P communication is the lens microcomputer 111. This is for the same reason as for the adapter microcomputer 302.
  • the lens microcomputer 111 transmits its ID information (authentication information) to the camera microcomputer 205 via the signal line DATA by P2P communication in response to the ID communication request command.
  • the camera microcomputer 205 confirms that the received ID information is that of the interchangeable lens 100, the camera microcomputer 205 determines that no further communication slave to be authenticated is connected.
  • step S505 the camera microcomputer 205 transmits an authentication end request command for ending the authentication communication process via the signal line DATA by broadcast communication. That is, authentication end communication is performed.
  • steps S512 and 516 the adapter microcomputer 302 and the lens microcomputer 111 receive an authentication end request command. As a result, the authentication communication process ends.
  • the camera microcomputer 205 sequentially designates the designated slave using the broadcast communication every time the CS output state indicates that the communication is on standby, while using the broadcast communication and the P2P communication. Perform authentication communication.
  • ID information as authentication information transmitted from the adapter microcomputer 302 and the lens microcomputer 111 to the camera microcomputer 205 in response to the ID communication request command is a serial number for each type of accessory device (for example, 00 for the interchangeable lens and 01 for the extender). It may be information. Moreover, the information to which the meaning was allocated for every bit may be sufficient. Furthermore, information of a plurality of bytes may be used. The ID information may be information indicating the type and function of the accessory device.
  • the camera microcomputer 205 confirms that the ID information is that of the interchangeable lens 100 and determines the end of the authentication communication has been described.
  • the ID information may include information indicating the interchangeable lens and information for instructing the end of the authentication communication, and the camera microcomputer 205 may detect the end of the authentication communication and determine the end of the authentication communication.
  • confirmation communication for confirming with the communication slave whether or not the authentication communication can be terminated may be separately performed by P2P communication before and after the ID communication.
  • the case where one adapter 300 is connected between the camera 200 and the interchangeable lens 100 has been described, but a plurality of adapters may be connected and connected. Even when a plurality of adapters are connected, it is possible to authenticate each adapter and the interchangeable lens 100 in a short time in the same procedure as described above. At this time, the plurality of adapters that simultaneously receive the authentication start request command by broadcast communication disconnect the CS switch almost simultaneously, so that the subsequent authentication is always performed sequentially from the adapter closer to the camera 200 one by one. It will be defeated. As in the case where one adapter is connected, the interchangeable lens 100 is finally authenticated, and a series of authentication communication processing is completed.
  • the authentication communication portion for the adapter 300 is not performed in the authentication communication processing shown in FIGS.
  • authentication communication for the interchangeable lens 100 is performed.
  • the adapter 300 in this embodiment may be an extender as described above, an adapter including a driveable optical member (a focus lens, a diaphragm, an anti-vibration lens, or the like), and various sensors (a phase difference sensor, an angular velocity).
  • a driveable optical member a focus lens, a diaphragm, an anti-vibration lens, or the like
  • various sensors a phase difference sensor, an angular velocity
  • An adapter including a sensor or the like may be used.
  • the above modification is the same also about Example 2 mentioned later.
  • authentication communication is sequentially performed from an accessory device closer to the camera 200 by switching the CS switch 3033 provided in the adapter 300. It can be performed. Finally, authentication communication for the interchangeable lens can be performed. Thereby, even if a plurality of accessory devices are connected to the camera 200, authentication communication can be performed in a short time.
  • Example 2 of the present invention will be described.
  • the communication line CS is connected and disconnected by the CS switch 3033
  • the communication line DATA is connected and disconnected by the switch. Since the configuration of the camera system in the present embodiment is the same as that in the first embodiment (FIG. 1), description thereof is omitted.
  • FIG. 11 shows a communication circuit configured between the camera microcomputer 205, the adapter microcomputer 302, and the lens microcomputer 111.
  • a data switch (channel switch) 3034 for connecting and disconnecting the communication line DATA is provided in the adapter 300 ′.
  • a CS switch 3033 for connecting and disconnecting the communication line CS is provided. 1 (FIG. 2).
  • the adapter microcomputer 302 ′ can connect and disconnect the signal line DATA by switching the DATA switch 3034 between the connected state and the disconnected state.
  • the data output state from the adapter 300 'to the signal line DATA from the camera side is not transmitted to the interchangeable lens side (interchangeable lens 100 in this embodiment).
  • the data output state from the adapter 300 ′ to the signal line DATA is not transmitted to the interchangeable lens side. That is, data communication using the signal line DATA cannot be performed from the adapter 300 ′ to the communication slave on the interchangeable lens side.
  • FIG. 12 shows signal waveforms in authentication communication processing performed between the camera microcomputer 205, the lens microcomputer 111, and the adapter microcomputer 302.
  • the signal output state (CS signal state) of the signal line CS is shown at the top in the drawing.
  • the lower “DATA (camera)” indicates data output from the camera microcomputer 205 to the signal line DATA
  • DATA (adapter)” indicates data output from the adapter microcomputer 302 to the signal line DATA.
  • DATA (lens)” indicates data that the lens microcomputer 111 outputs to the signal line DATA.
  • CS output (camera) indicates a signal output from the camera microcomputer 205 to the signal line CS
  • CS output (adapter) indicates a signal output from the adapter microcomputer 302 to the signal line CS.
  • CS output (lens) indicates a signal output from the lens microcomputer 205 to the signal line CS.
  • DATASW indicates the state of the DATA switch 3034 controlled by the adapter microcomputer 302, and Low indicates the connection state.
  • the flowchart in FIG. 13 shows the flow of authentication communication processing.
  • this authentication communication processing power supply from the camera 200 to the interchangeable lens 100 and the adapter 300 ′ is started in response to detecting the connection of the interchangeable lens 100 by a detection switch (not shown) provided in the camera 200. Depending on the situation.
  • the camera microcomputer 205 transmits an authentication start request command via the signal line DATA by broadcast communication in step S600. That is, authentication start communication is performed. This process is performed as a preprocess for authentication communication by the camera microcomputer 205. At this time, the DATA switch 3034 is set to the connected state. Note that processing in broadcast communication and P2P communication performed later is as described with reference to FIGS. 7A and 7B and FIGS. 8A and 8B. Also in this embodiment, the adapter microcomputer 302 and the lens microcomputer 111 are different in signal (Low and Hi) on the signal line CS during communication with the camera microcomputer 205 (communication start to end) and communication standby in broadcast communication and P2P communication. ) Is output.
  • the adapter microcomputer 302 and the lens microcomputer 111 that have received the authentication start request command perform broadcast communication reception processing in steps S606 and S613, respectively. If the received result is an authentication start request command, the adapter microcomputer 302 switches the DATA switch 3034 to a disconnected state in step S607.
  • the timing of this switching is after the adapter microcomputer 302 cancels the low output to the signal line CS (after step S208 in FIG. 7), but may be just before or simultaneously with the low output cancel. Absent.
  • the camera microcomputer 205 cancels the low output to the signal line CS by the adapter microcomputer 302 and the communication circuit is in communication standby, and in step S601, the authentication request command is transmitted via the communication line DATA by broadcast communication. Send. That is, authentication request communication is performed. In the subsequent processing, the camera microcomputer 205 performs authentication communication.
  • the authentication request command is slave designation data for designating the communication slave that has received the broadcast request as the designated slave (specific accessory device) as in the first embodiment. Since the communication line DATA is disconnected by the DATA switch 3034 in step S607, the authentication request command via the communication line DATA in step S601 is not detected by the lens microcomputer 111.
  • the lens microcomputer 111 since the communication line CS is connected, the lens microcomputer 111 also detects that the communication line CS becomes Low and then becomes Hi. However, since no data is sent via the communication line DATA, the lens microcomputer 111 terminates the processing assuming that there is no communication.
  • the adapter microcomputer 302 receives the authentication request command by broadcast communication in step S608.
  • the adapter microcomputer 302 that has received the authentication request command has received the authentication request command for the first time. Therefore, it is the slave designation data transmitted to itself, and the next P2P communication is communication addressed to itself. Interpret.
  • step S602 the camera microcomputer 205 transmits an ID communication request command via the signal line DATA by P2P communication. That is, authentication information communication is performed.
  • the camera microcomputer 205 does not recognize that the communication partner of P2P communication is the adapter microcomputer 302. This is because it is not yet known at this point how many accessories are connected to the camera 200.
  • the camera microcomputer 205 only knows that one of the connected communication slaves responds to the P2P communication by designating the designated slave by the authentication request command transmitted in step S601.
  • step S609 the adapter microcomputer 302 designated as the designated slave receives the ID communication request command by P2P communication, and in response to this, the ID microcomputer (authentication information) is received by the camera microcomputer via the signal line DATA by P2P communication.
  • the adapter microcomputer 302 switches the DATA connection switch 3034 to the connected state in step S610.
  • the switching timing is after the adapter microcomputer 302 cancels the low output to the signal line CS (after step S410 in FIG. 8), but it may be just before or simultaneously with the low output cancel.
  • steps S602 and S609 may be performed only once in the camera microcomputer 205 and the adapter microcomputer 302 as shown in FIG. 12, or may be performed in two or more times.
  • step S609 the timing for switching the DATA switch 3034 to the connected state is after step S609 in this flowchart, it may be before step 609 (after reception of the authentication request command in step S608).
  • the adapter microcomputer 302 that has received the authentication request command by broadcast communication recognizes that it is slave designation data to itself, and the lens microcomputer 111 that has not received the authentication request command has received slave designation data to itself. It is because it does not recognize. For this reason, even if the DATA switch 3034 is switched to the connected state after step S608, only the adapter microcomputer 302 responds to the ID communication request command in step S609.
  • the camera microcomputer 205 requests authentication via the signal line DATA again by broadcast communication in step S603. Send a command.
  • the adapter microcomputer 302 receives the authentication request command in step S611, and further receives the lens microcomputer 111 in step S614.
  • the adapter microcomputer 302 has already finished communication (that is, authentication) in response to the authentication request command and the ID communication request command, the authentication request command is ignored here.
  • the lens microcomputer 111 interprets it as slave designation data for itself and prepares for P2P communication.
  • the camera microcomputer 205 transmits an ID communication request command via the signal line DATA by P2P communication in step S604. Again, the camera microcomputer 205 does not recognize that the other party of the P2P communication is the lens microcomputer 111. This is for the same reason as for the adapter microcomputer 302.
  • the lens microcomputer 111 transmits its ID information (authentication information) to the camera microcomputer 205 via the signal line DATA by P2P communication in response to the ID communication request command.
  • the camera microcomputer 205 confirms that the received ID information is that of the interchangeable lens 100, the camera microcomputer 205 determines that no further communication slave to be authenticated is connected.
  • step S605 the camera microcomputer 205 transmits an authentication end request command for ending the authentication communication process via the signal line DATA by broadcast communication. That is, authentication end communication is performed.
  • steps S612 and 616 the adapter microcomputer 302 and the lens microcomputer 111 receive an authentication end request command. As a result, the authentication communication process ends.
  • the camera microcomputer 205 sequentially designates the designated slave using the broadcast communication every time the CS output state indicates that the communication is on standby, while using the broadcast communication and the P2P communication. Perform authentication communication.
  • authentication is sequentially performed from an accessory device closer to the camera 200 by switching the DATA switch 3034 provided in the adapter 300 ′. Communication can be performed. Finally, authentication communication for the interchangeable lens can be performed. Thereby, even if a plurality of accessory devices are connected to the camera 200, authentication communication can be performed in a short time.
  • the embodiment described above can be used in combination with another communication channel in addition to the communication channel including the notification channel CS and the data communication channel DATA.
  • the notification channel CS and the data communication channel DATA described above are communication lines for communication called third communication.
  • the third communication when the operation member 304 is operated by the user, the adapter microcomputer 302 and the camera microcomputer 205 communicate the operation and the operation amount. Even when the operation member 130 is operated by the user, communication may be performed between the lens microcomputer 111 and the camera microcomputer 205 using the third communication line.
  • the lens microcomputer 111 controls the communication unit 131 for performing the first communication and the communication unit 132 for performing the second communication, in addition to the communication unit 112.
  • the camera microcomputer 205 controls the communication unit 209 for performing the first communication and the communication unit 210 for performing the second communication.
  • the first communication is communication performed via the communication unit 131 and the communication unit 209.
  • the communication unit 131 performs communication via the notification channel CS1, the data communication channel DCL, and the data communication channel DLC based on an instruction from the lens microcomputer 111, and the communication unit 209 based on an instruction from the camera microcomputer 205.
  • the communication unit 131 and the communication unit 209 set the voltage level of the notification channel CS1, the communication rate (data amount per unit time) and communication voltage in asynchronous communication. Further, in response to an instruction from the lens microcomputer 111 or the camera microcomputer 205, data is transmitted / received via the data communication channel DCL and the data communication channel DLC.
  • the notification channel CS1 is a signal line used for notification of a communication request from the camera 200 to the interchangeable lens 100.
  • the data communication channel DCL is a channel used when data is transmitted from the camera 200 to the interchangeable lens 100
  • the data communication channel DLC is a channel used when data is transmitted from the interchangeable lens 100 to the camera 200.
  • the camera microcomputer 205 and the lens microcomputer 111 communicate by clock synchronous communication or start-stop synchronous communication. Initial communication performed when the interchangeable lens 100 is connected to the camera 200 is also performed by first communication.
  • the camera microcomputer 205 and the lens microcomputer 111 communicate the identification information of the interchangeable lens 100, and when it is determined that the interchangeable lens 100 mounted with the camera 200 is compatible with start-stop synchronization communication, the communication method is changed from clock synchronization communication to start-stop synchronization communication. Switch.
  • the camera microcomputer 205 may identify whether or not the interchangeable lens 100 is compatible with the third communication that performs communication including the adapter 300. If the camera microcomputer 205 determines that the interchangeable lens 100 is compatible with the third communication, the camera microcomputer 205 may perform authentication communication for recognizing the interchangeable lens 100 and the intermediate adapter 300 via P2P communication.
  • the second communication is a one-way communication from the interchangeable lens 100 to the camera 200.
  • the second communication is performed via the communication unit 132 and the communication unit 210.
  • the communication unit 132 communicates via the notification channel CS2 and the data communication channel DLC2 based on an instruction from the lens microcomputer 111, and the communication unit 210 based on an instruction from the camera microcomputer 205.
  • the camera communication unit 208 and the lens communication unit 118 transmit and receive data by clock synchronous communication or asynchronous communication.
  • the present invention supplies a program that realizes one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and one or more processors in a computer of the system or apparatus read and execute the program This process can be realized. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.
  • a circuit for example, ASIC

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Structure And Mechanism Of Cameras (AREA)
  • Studio Devices (AREA)
  • Accessories Of Cameras (AREA)
PCT/JP2018/020729 2017-05-31 2018-05-30 カメラ、アクセサリ装置、通信制御方法、コンピュータプログラム、およびカメラシステム Ceased WO2018221570A1 (ja)

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CN201880035994.7A CN110709770B (zh) 2017-05-31 2018-05-30 照相机、配件设备、通信控制方法、存储介质和照相机系统
US16/697,275 US11067874B2 (en) 2017-05-31 2019-11-27 Camera, accessory apparatus, communication control method, storage medium, and camera system
US17/342,662 US11543736B2 (en) 2017-05-31 2021-06-09 Camera, accessory apparatus, communication control method, storage medium, and camera system

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US11067874B2 (en) 2021-07-20
US20210294183A1 (en) 2021-09-23
US11543736B2 (en) 2023-01-03
JP6537673B2 (ja) 2019-07-03
CN113691710A (zh) 2021-11-23
JP7130597B2 (ja) 2022-09-05
US20200096841A1 (en) 2020-03-26
JP7401612B2 (ja) 2023-12-19
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CN110709770A (zh) 2020-01-17
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