JP2020177250A - Imaging apparatus, accessory apparatus and communication control method therefor - Google Patents

Abstract

To identify an accessory apparatus that does not need communication and shift the accessory into a power saving state.SOLUTION: A plurality of accessory apparatuses 30 and 40 can be mounted on an imaging apparatus 20. The imaging apparatus includes camera communication parts 207 and 208 that provide communication paths to the plurality of accessory apparatuses, and a camera control part 205 performing communication with the accessories via the camera communication parts. The camera control part transmits a first request to the accessory apparatuses, receives first information corresponding to whether to stop communication with the imaging apparatus from each of the accessory apparatuses that have received the first request, and controls communication with the plurality of accessory apparatuses according to first information.SELECTED DRAWING: Figure 1

Description

The present invention relates to an imaging system including an imaging device (hereinafter, referred to as a camera body) capable of communicating with each other and an accessory device (hereinafter, simply referred to as an accessory) such as an interchangeable lens and an intermediate adapter.

An imaging system such as the one described above can be rotated to make optical adjustments such as focal length, focus state, aperture, etc., set ISO sensitivity, and enable / disable functions such as autofocus and vibration isolation. Operating members such as an operating ring and a slide switch are provided. Further, the imaging system has an auto power-off function that automatically shifts the power supply of the entire imaging system to a power saving state (sleep state) when no operation is performed for a certain period of time. When the imaging system detects any operation in the sleep state, it returns from the sleep state to the normal operation state (that is, starts up).

In Patent Document 1, the identification information of the interchangeable lens is transmitted to the intermediate adapter, and when it is determined from the identification information that the intermediate adapter is a specific interchangeable lens, the intermediate adapter is partially operated in a restricted operation state (power saving state). The imaging system to be transferred to is disclosed.

Japanese Patent No. 5208169

The conventional auto power-off function puts the entire imaging system to sleep, including the interchangeable lens, intermediate adapter, and camera body. However, in order to reduce power consumption after performing normal communication in the imaging system, for example, it is necessary to put only accessories that do not require communication into the sleep state.

Further, in the imaging system disclosed in Patent Document 1, when the interchangeable lens is determined to be a specific interchangeable lens, the intermediate adapter is shifted to the power saving state. For example, when the intermediate adapter has an operating member, , It is necessary to communicate the operation of the operating member with the camera body.

The present invention provides an imaging system capable of identifying accessories that do not require communication.

The imaging device as one aspect of the present invention can be equipped with a plurality of accessory devices. The imaging device includes a camera communication unit that provides a communication path between the plurality of accessory devices, and a camera control unit that communicates with the plurality of accessory devices via the camera communication unit. The camera control unit transmits the first request to the plurality of accessory devices, and each of the plurality of accessory devices that has received the first request determines whether or not to stop the communication with the image pickup device. It is characterized in that it receives information and controls communication with a plurality of accessory devices according to the first information.

Further, the accessory device as another aspect of the present invention is mounted on an imaging device to which a plurality of accessory devices can be mounted. The accessory device has an accessory communication unit that provides a communication path with the image pickup device, and an accessory control unit that communicates with the image pickup device via the accessory communication unit. The accessory control unit is characterized in that, in response to receiving the first request from the image pickup device, the accessory control unit transmits the first information corresponding to whether or not to stop the communication with the image pickup device to the image pickup device.

An imaging system including the imaging device and an accessory device also constitutes another aspect of the present invention.

Further, the communication control method as another aspect of the present invention is applied to an imaging device to which a plurality of accessory devices can be attached. The communication control method corresponds to a step of transmitting a first request to a plurality of accessory devices and whether or not to stop communication with the image pickup device from each of the plurality of accessory devices that have received the first request. It is characterized by having a step of receiving the first information and a step of controlling communication with a plurality of accessory devices according to the first information.

Further, the communication control method as another aspect of the present invention is applied to an accessory device mounted on an imaging device capable of mounting a plurality of accessory devices. In the communication control method, the step of receiving the first request from the image pickup device and the first information corresponding to whether or not to stop the communication with the image pickup device are transmitted to the image pickup device in response to the first request. It is characterized by having a step to perform.

A computer program that causes a computer of an imaging device or an accessory device to execute a process according to the above communication control method also constitutes another aspect of the present invention.

According to the present invention, since the imaging device can identify the accessory device that does not require communication, unnecessary communication can be reduced and the immediacy of communication can be improved. Further, after identifying the accessory device that does not require communication, the accessory device shifts to the power saving state, so that the power consumption can be reduced.

The block diagram which shows the structure of the camera system of Example 1 of this invention. The figure explaining the 1st communication in Example 1. FIG. The figure explaining the 2nd communication in Example 1. FIG. The flowchart which shows the process from the acquisition of the second communication stop information of the accessory (interchangeable lens and the intermediate adapter) in Example 1 to the transition to the normal operation state. FIG. 5 is a flowchart showing a process in which the camera body acquires accessory identification information and second communication stop information in the first embodiment. FIG. 5 is a flowchart showing a process in which the camera body acquires detailed accessory information in the first embodiment. The flowchart which shows the process which performs the accessory operation setting in Example 1. FIG. FIG. 5 is a flowchart showing a process in which the camera body responds to a communication request from an accessory in the first embodiment. The flowchart which shows the process which retries the authentication communication by the communication error in Example 3 of this invention. The figure which shows the signal waveform in the pace synchronous communication in Example 4 of this invention. A block diagram illustrating the configuration of the camera system of the fifth embodiment. The figure explaining the configuration for the 1st communication of Example 5. Flow chart showing the flow of the process of acquiring the initial communication with the accessory of the fifth embodiment and the corrected optical information. A flowchart showing the initial communication processing of the camera and the lens of the fifth embodiment. Flow chart showing initial communication processing of the camera and accessories of the fifth embodiment A flowchart showing a flow of processing for determining the first accessory of the fifth embodiment. Flow chart showing the flow of the process of searching for the dynamic accessory of the sixth embodiment A flowchart showing the flow of optical information correction processing according to the operation of the dynamic accessory of the sixth embodiment. The figure which shows the example of the information communicated in the initial communication A flowchart showing the flow of the process of acquiring the correction identification information of the seventh embodiment and the correction process using the correction identification information. The figure explaining the configuration for the 2nd communication of Example 5. The figure explaining the modification of the 1st communication of Example 5. A block diagram illustrating a configuration of a camera system when the end of the eighth embodiment is an interchangeable lens. A block diagram illustrating a configuration of a camera system when the end of the eighth embodiment is an intermediate accessory. A flowchart showing a flow of processing for detecting a communication error in the second communication of the eighth embodiment.

Hereinafter, examples of the present invention will be described with reference to the drawings.

FIG. 1 shows the configuration of an imaging system (hereinafter referred to as a camera system) according to a first embodiment of the present invention. In this camera system, a plurality of accessory devices (hereinafter collectively referred to as accessories) including an interchangeable lens 10 and a plurality of intermediate adapters 30 and 40 are detachably and communicably attached to a camera body 20 which is an imaging device. Used in the state. The intermediate adapters 30 and 40 are a teleconverter or wide converter for changing the focal length, a mount converter for changing the flange back length, an ND filter having a dimming function, and the like. The interchangeable lens 10 may be attached directly to the camera body 20 (without using the intermediate adapters 30 and 40), or even if there is only one intermediate adapter provided between the camera body 20 and the interchangeable lens 10. Good.

The mount 202 of the camera body 20 and the mount 302 of the intermediate adapter 30 are mechanically and electrically coupled, and the mount 301 of the intermediate adapter 30 and the mount 402 of the intermediate adapter 40 are mechanically and electrically coupled. Further, the mount 301 of the intermediate adapter 40 and the mount 101 of the interchangeable lens 10 are mechanically and electrically coupled. The camera body 20 is provided with a camera first communication unit 207, a camera second communication unit 208, and a camera control unit 205 as a computer. The camera communication unit is composed of the camera first communication unit 207 and the camera second communication unit 208.

The interchangeable lens 10 is provided with a lens first communication unit 114, a lens second communication unit 115, and a lens control unit (accessory control unit) 113 as a computer. The lens first communication unit 114 and the lens second communication unit 115 constitute an accessory communication unit. The intermediate adapters 30 and 40 are provided with adapter second communication units 308 and 408 as accessory communication units and adapter control units (accessory control units) 309 and 409 as computers, respectively.

Between the camera first communication unit 207 and the lens first communication unit 114, the first communication contact units 202, 305, 303, 405, 403, provided on the mounts 201, 302, 301, 402, 401, 101, A first communication path is provided using 102. The camera control unit 205 and the lens control unit 113 perform "one-to-one" communication (hereinafter, also referred to as first communication) via this first communication path. Further, between the camera second communication unit 208, the adapter second communication units 308, 408, and the lens second communication unit 115, the second communication contact units provided on the mounts 201, 302, 301, 402, 401, 101 are provided. A second communication path is provided using 203, 306, 304, 406, 404, 103. The camera control unit 205 performs "one-to-many" communication (hereinafter, also referred to as a second communication) between the lens control unit 113 and the adapter control units 309 and 409 via this second communication path.

By performing the first communication and the second communication via different communication paths, for example, in the first communication, as compared with the case where the first communication and the second communication are performed via the same communication path. A command or request can be transmitted from the camera body 20 to the interchangeable lens 10 at a more appropriate timing. As a result, the camera body 20 can control the interchangeable lens 10 at higher speed and with higher accuracy.

The intermediate adapters 30 and 40 each have a second communication connection switch 311,411. The second communication connection switches 311, 411 are provided on the second communication path on the interchangeable lens side of the adapter second communication units 308 and 408, respectively, and are switched so as to connect and disconnect the second communication path. To do. The switching operations of the second communication connection switches 311, 411 are controlled by the adapter control units 309 and 409, respectively. By providing these second communication connection switches 311, 411 on the intermediate adapters 30 and 40, it is possible for the intermediate adapters 30 and 40 themselves to change the second communication state (opening and blocking).

The interchangeable lens 10 has an imaging optical system. The imaging optical system reduces the focus lens 104 that adjusts the focus, the zoom lens (variable lens) 105 that adjusts the magnification, the aperture (iris) unit 106 that adjusts the amount of light, and the image shake in order from the subject side (not shown). The anti-vibration lens 107 is included. The focus lens 104 and the zoom lens 105 are driven by the focus drive unit 108 and the zoom drive unit 109 in the optical axis direction, which is the direction in which the optical axis of the imaging optical system extends, respectively. The focus drive unit 108 and the zoom drive unit 109 include an actuator such as a stepping motor and a drive circuit thereof.

The diaphragm unit 106 includes a plurality of diaphragm blades (not shown), and the light amount is adjusted by driving them in the opening / closing direction by the iris drive unit 110. The iris drive unit 110 includes an actuator such as a stepping motor and a drive circuit thereof.

The anti-vibration lens 107 is shift-driven by the anti-vibration drive unit 111 in a direction orthogonal to the optical axis of the imaging optical system in response to camera shake such as camera shake. The anti-vibration drive unit 111 includes an actuator such as a voice coil motor and a drive circuit thereof. The interchangeable lens 10 is provided with a shake detection unit 112 such as a gyro sensor for detecting camera shake.

Further, the interchangeable lens 10 has a lens operation unit 116. The lens operation unit 116 includes a plurality of operation members such as a lens operation ring, a switch, a button, a dial, and a touch panel that can be rotated by the user around the optical axis. The operation by the lens operation unit 116 is detected by the lens control unit 113.

The lens control unit 113 controls the operation of each unit in the interchangeable lens 10. Specifically, the camera control unit 205 receives the control command and the transmission request command transmitted from the camera body 20 by the first communication, and performs lens control corresponding to the control command. Further, the lens control unit 113 transmits the optical information of the imaging optical system corresponding to the transmission request command transmitted from the camera body 20 by the first or second communication and the operation information of the lens operation unit 116 to the camera body 20. .. Further, the lens control unit 113 controls the shift drive (that is, the vibration isolation operation) of the vibration isolation lens 107 via the vibration isolation drive unit 111 based on the vibration signal from the vibration detection unit 112.

The intermediate adapters 30 and 40 have adapter operating units 310 and 410. The adapter operation units 310 and 410 include a plurality of operation members such as an adapter operation ring, a switch, a button, a dial, and a touch panel that can be rotated by the user around the optical axis. Operations by the adapter operation units 310 and 410 are detected by the adapter control units 309 and 409.

The adapter control units 309 and 409 control the operation of each unit in the intermediate adapters 30 and 40, respectively. The adapter control units 309 and 409 receive the control command and the transmission request command transmitted from the camera body 20 by the first communication, respectively. Further, the adapter control units 309 and 409 perform adapter control corresponding to the control command. Further, the adapter control units 309 and 409 receive optical information of the intermediate adapters 30 and 40 and operation information of the adapter operation units 310 and 410 corresponding to the transmission request command transmitted from the camera body 20 by the first or second communication. It is transmitted to the camera body 20.

The camera body 20 includes an image sensor 204 such as a CCD sensor or a CMOS sensor, a camera control unit 205, and an image display unit 206. The image pickup element 204 is a photoelectric conversion element such as a CMOS sensor, and images (photoelectrically converts) a subject image formed by the imaging optical system. The image display unit 206 displays the image signal generated by the imaging as a live view image used for confirming the composition, the focus state, and the like, and reproduces and displays the image recorded by the imaging.

The camera control unit 205 controls the operation of each unit in the camera body 20 in response to the operation of the camera operation unit 209 including an imaging instruction switch (not shown), various setting switches, and the like. For example, the exposure time of the image sensor 204 is controlled for exposure control. Further, the camera control unit 205 transmits a control command to the interchangeable lens 10 and the intermediate adapters 30 and 40 by the first communication. For example, the camera control unit 205 transmits a control command related to zoom control to the interchangeable lens 10 in response to the operation of the zoom switch included in the camera operation unit 209. Further, the camera control unit 205 transmits to the interchangeable lens 10 a control command related to light amount adjustment control according to the brightness information of the video signal and a control command related to focus control according to the focus information obtained from the image sensor 204. To do.

Further, the camera control unit 205 transmits a transmission request command for acquiring optical information and operation information to the interchangeable lens 10 and the intermediate adapters 30 and 40, and the lens optical information and the intermediate adapter 30 from the interchangeable lens 10 are transmitted. Receives adapter optical information from 40. Further, the camera control unit 205 receives the operation information of the lens and the adapter operation units 116, 310, 410 from the interchangeable lens 10 and the intermediate adapters 30 and 40, and issues a control command corresponding to the operation information of the interchangeable lens 10 and the intermediate adapter 30 and 40. Send to 40.

Next, the first communication will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows the configuration of a first communication circuit for performing the first communication by the three-wire clock synchronous communication. The first communication contact units 102, 403, 405, 303, 305, 202 serve as terminals of the clock line LCLK, which is a signal line for the clock signal output from the camera first communication unit 207 for clock synchronous communication. The first LCLK terminals 102a, 403a, 405a, 303a, 305a, 202a are included. Further, the first communication contact units 102, 403, 405, 303, 305, 202 are the first DCL terminals 102b, 403b as terminals of the data line DCL from which the data signal of the clock synchronous communication is output from the camera first communication unit 207. , 405b, 303b, 305b, 202b. Further, the first communication contact units 102, 403, 405, 303, 305, 202 are the first DLC terminals 102c, 403c, as terminals of the data line DLC from which the data signal of the clock synchronous communication is output from the lens first communication unit 114. Includes 405c, 303c, 305c, 202c.

As shown in FIG. 2A, the clock line LCLK and the data line DCL are pulled up in the interchangeable lens 10. Further, the clock line LCLK and the data line DLC are pulled up in the camera body 20.

The clock lines LCLK, data line DCL, and data line DLC in the intermediate adapters 30 and 40 are short-circuited between the first communication contact portions 303 and 305 and between the first communication contact portions 403 and 405, respectively.

FIG. 2B shows the signal waveforms of the clock line LCLK, the data line DCL, and the data line DLC when the first communication is performed. The camera first communication unit 207 outputs a clock signal to the clock line LCLK, and outputs 8-bit data of B7 to B0 to the data line DCL in accordance with the rising edge of the clock signal. The lens first communication unit 114 outputs 8-bit data of B7 to B0 to the data line DLC in accordance with the rising edge of the clock signal. The camera first communication unit 207 receives 8-bit data of B7 to B0 from the data line DLC in accordance with the rising edge of the clock signal. The lens first communication unit 114 receives 8-bit data of B7 to B0 from the data line DCL in accordance with the rising edge of the clock signal. In this way, the camera first communication unit 207 and the lens first communication unit 114 can transmit and receive data to and from each other.

When the lens first communication unit 114 receives the 8-bit data B7 to B0 from the data line DCL, the clock line LCLK is maintained at LOW during the time Tbusy, and the clock signal is maintained at LOW when the time Tbusy elapses. To cancel. The time Tbusy is the time for processing the data received by the interchangeable lens 10, and the camera first communication unit 207 does not perform the next data transmission until the clock line LCLK changes from LOW to HIGH after the data transmission. The camera first communication unit 207 and the lens first communication unit 114 repeat the above processing to transmit and receive data by the first communication.

Next, the second communication will be described with reference to FIG. FIG. 3 shows the configuration of a second communication circuit for performing the second communication. The camera second communication unit 208, the lens second communication unit 115, and the adapter second communication unit 308, 408 are communicably connected via the second communication contact units 203, 306, 304, 406, 404, 103. .. Of the second communication contact portions 203, 306, 304, 406, 404, 103, a CS signal line (first signal line) is provided via the CS contacts 203a, 306a, 304a, 406a, 404a, 103a. Further, among the second communication contact portions 203, 306, 304, 406, 404, 103, the DATA signal line (second signal line) is provided via the DATA contacts 203b, 306b, 304b, 406b, 404b, 103b. There is. The CS signal line is a signal line for propagating a signal (command) for controlling communication, and the DATA signal line is a signal line for propagating transmitted and received data.

The camera body 20 is provided with a ground switch 221 and an input / output changeover switch 222. The interchangeable lens 10 is provided with a ground switch 121 and an input / output changeover switch 122. The intermediate adapters 30 and 40 are provided with a ground switch 321 and an input / output changeover switch 322.

The camera control unit 205, the lens control unit 113, and the adapter control units 309 and 409 are in the state of the CS signal line (Hi and Hi) through the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308 and 408, respectively. Low) can be detected. The CS signal line is a pull-up connection to a power source (not shown) in the camera body 20, and is an open drain connection that can be connected to the GND via the ground switches 221, 121, 321, 421. With this configuration, the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308, 408, respectively, turn on (connect) the ground switches 211, 121, 321, 421, respectively, to turn on (connect) the CS signal line. Can be set to Low. Further, the CS signal line can be set to Hi by turning off (cutting off) all of the ground switches 221, 121, 321, 421. The CS signal line is used to distinguish between broadcast communication and P2P communication, to switch the communication direction in P2P communication, and the like.

The DATA signal line is a single bidirectional data transmission line that can be used while switching the data propagation direction. The DATA signal line is connected to the lens second communication unit 115 via the input / output changeover switch 122 of the interchangeable lens 10, and is connected to the camera second communication unit 208 via the input / output changeover switch 222 of the camera body 20. Further, the intermediate adapters 30 and 40 are connected to the adapter second communication units 308 and 408, respectively, via the input / output changeover switch 322.

The camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308, 408 are a data output unit (CMOS method) for transmitting data and a data input unit (CMOS) for receiving data, respectively. Method) and. The camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308, 408 operate the input / output changeover switches 222, 122, 322, 422, respectively, to convert the DATA signal line into a data output unit. You can select which of the data input units to connect to.

That is, the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308, 408, when transmitting data by themselves, the camera second communication unit 208, the lens second communication unit 115, and the lens second communication unit 115. The input / output changeover switches 222, 122, 322, and 422 are operated so as to connect the DATA signal line to the data output unit through the adapter second communication units 308 and 408. On the other hand, when the data is received by itself, the input / output is switched so as to connect the DATA signal line to the data input unit through the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication unit 308, 408. Operate switches 222, 122, 322, 422.

Here, broadcast communication and P2P communication performed by the CS signal line and the DATA signal line will be described. The CS signal line becomes Low when any of the ground switches 221, 121, 321, 421 is turned on. The Low of this CS signal line is used as a trigger for broadcast communication. Broadcast communication is started when the camera control unit 205, which is a communication master, sets the CS signal line to Low through the camera second communication unit 208. The lens control unit 113 and the adapter control units 309 and 409 determine that the data received via the DATA line when the CS signal line is Low is the data in the broadcast communication. Further, the lens control unit 113 and the adapter control units 309 and 409 can request broadcast communication from the camera control unit 205 by setting the CS signal line to Low.

The camera control unit 205, the lens control unit 113, and the adapter control units 309 and 409 that have detected the Low of the CS signal line keep their grounding switches on during the broadcast communication processing. As a result, it is possible to notify other control units that the processing for the broadcast communication is continuing.

By defining that the second communication starts with the broadcast communication and ends with the broadcast communication, the DATA signal line of the accessory basically needs to maintain the reception state. When the camera control unit 205 performs P2P communication with the accessories (lens control unit 113 and adapter control units 309, 409), the accessory to be communicated is first specified by broadcast communication. The camera control unit 205 that has completed the transmission of the broadcast communication performs P2P communication with the designated accessory.

In P2P communication, the camera control unit 205 first transmits data to the accessory, and the accessory that receives the data transmits the data to the camera control unit 205. After that, these are performed alternately. In P2P communication, it is distinguished from broadcast communication by maintaining the CS signal line during communication at High. The CS signal line in P2P communication is used as a busy signal. That is, each of the camera control unit 205 and the accessory sets the CS signal line to Low in order to notify the communication partner that the data transmission from itself has been completed, and sets the CS signal to notify that the data reception is ready. Set the line to High.

When the P2P communication is completed, the camera control unit 205 notifies each accessory of the end of the P2P communication by broadcast communication. In this way, the camera control unit 205 can perform data communication with the plurality of accessories via the two communication lines.

The communication circuit shown in FIG. 3 is merely an example, and other communication circuits may be used. For example, the CS signal line is pull-down connected to the GND in the camera body 20, and is not shown via the ground switch 121 of the interchangeable lens 10, the ground switch 221 of the camera body 20, and the ground switches 321 and 421 of the intermediate accessories 30 and 40. It may be configured so that it can be connected to a power source. Further, the DATA signal line may be configured to be always connected to the data input units of the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308, 408. In this case, the connection and disconnection between the DATA signal line and the data output units of the camera second communication unit 208, the lens second communication unit 115, and the adapter second communication units 308 and 408 may be switched by a switch.

In this embodiment, the first communication circuit described above performs communication required for immediacy between the camera body 20 and the interchangeable lens 10, and operates the operating members provided on the interchangeable lens 10 and the intermediate adapters 30 and 40. Communication with low immediacy, such as volume communication, is performed by the second communication circuit. As a result, the immediacy of control of the interchangeable lens 10 can be ensured. Since the first communication is one-to-one communication between the camera body 20 and the interchangeable lens 10, there is no risk of data collision unlike one-to-many communication, and communication for avoiding it can be omitted, so that immediacy is achieved. High communication is possible.

Further, by using only the second communication circuit for communication between the camera body 20 and the accessories (interchangeable lens 10 and intermediate adapters 30, 40), the accessory needs to support the high-speed and advanced communication protocol of the first communication. Is gone. Therefore, the cost of accessories can be reduced.

On the other hand, in the second communication, since this is one-to-many communication, there is a risk of data collision. In order to avoid this, the procedure for occupying the communication is performed as described above. When the camera body 20 communicates with a communication target accessory, the identification information (ID) indicating the communication target accessory is notified by broadcast communication. Then, only the communication target accessory responds to the communication from the camera body 20 until the camera body 20 then notifies the opening of the second communication circuit by broadcast communication.

As described above, when the content of the communication exchanged in the second communication is mainly to transmit the operation amount of the operating member provided on the accessory, most of the communication is based on the communication request from the accessory. To be started. When the communication request can be made simply by changing the signal line level common to all accessories as in this embodiment, the camera body 20 that has received the communication request sequentially confirms whether the request has been made to each accessory. There is a need to.

Therefore, it is significant from the viewpoint of reducing the amount of communication that the camera body 20 knows whether or not each of the plurality of attached accessories is an accessory that makes a communication request. For example, when a communication request is generated from any of a plurality of accessories, if there is only one accessory that makes the communication request, it is sufficient to inquire about the cause of the communication request only for that accessory.

In this embodiment, the interchangeable lens 10 uses both the first communication and the second communication for communication with the camera body 20. At this time, the first communication is used for communication that requires immediacy so that the interchangeable lens 10 transmits status information indicating the state to the camera body 20 and communication that transmits control parameters from the camera body 20 to the interchangeable lens 10. Use. On the other hand, the second communication is used for communication with low immediacy such as communicating the operation amount of the operation member provided on the interchangeable lens 10 to the camera body 20.

Next, processing from when the camera body 20 receives the second communication stop information as the first information from the accessory until the second communication stop information is used in the normal operating state of the camera system (communication control method). Will be described with reference to the flowchart of FIG. The normal operating state is a state in which the entire camera system has completed the setting of each accessory by the camera body 20 after the end of the initial communication described later. Further, the camera control unit 205, the adapter control units 309 and 409, and the lens control unit 113 execute the following processes according to the computer program.

The camera control unit 205 activated by turning on the power in S401 proceeds to S402 and supplies power (hereinafter referred to as accessory power supply) to the interchangeable lens 10 and the intermediate accessories 30 and 40 via a power supply mount contact (not shown). ..

Next, in S403, the camera control unit 205 performs initial communication with the lens control unit 113 by the first communication. In the initial communication, the identification information of the interchangeable lens 10 (hereinafter, referred to as lens identification information) is received. The lens identification information may be model number information used for identifying the type (model) of the interchangeable lens 10, or optical data information indicating optical data unique to the interchangeable lens 10. Further, it may be information indicating the function of the interchangeable lens 10 or a manufacturing number (serial number) capable of identifying an individual in the same model.

Further, in S404, the camera control unit 205 performs initial communication with the accessories (lens control unit 113 and adapter control units 309, 409) by the second communication, and receives the accessory authentication information. The series of communication in S404 is referred to as accessory authentication communication in the following description. Here, the accessory authentication information includes accessory identification information (lens identification information and adapter identification information) and second communication stop information. That is, the information exchanged in the accessory authentication communication is the basic information necessary for designating a specific accessory as a communication target and performing communication in the second communication.

The lens identification information transmitted from the lens control unit 113 to the camera control unit 205 by the second communication may be the same information as the lens identification information transmitted by the first communication, or may be an interchangeable lens. It may be a specific value to indicate. On the other hand, since the adapter identification information is used for designating the communication target of P2P communication by the second communication, it is necessary to make the information unique between the intermediate adapters 30 and 40. The adapter identification information may be model number information used for identifying the types (models) of the intermediate adapters 30 and 40, or optical data information indicating optical data unique to the intermediate adapters 30 and 40. May be good. Further, it may be information indicating the functions of the intermediate adapters 30 and 40, or a manufacturing number (serial number) capable of identifying an individual in the same model.

The second communication stop information is logical type information that indicates the operating status of the second communication after the accessory authentication communication and can take two values of "true" and "false". That is, the second communication stop information is information corresponding to whether or not to stop the second communication. The accessory whose second communication stop information is "true" stops the operation of the second communication unit (115, 308 or 408) after transmitting the second communication stop information. The state in which the second communication unit is stopped continues until the accessory power supply is cut off. When the accessory power is cut off and then re-supplied (re-turned on), the accessory starts in a state where the second communication is possible (a state in which the second communication unit is operating).

Further, when the accessory whose second communication stop information is "true" is the intermediate adapter (30 or 40), the adapter second communication unit (308 or 408) alone does not have the first communication control unit. The adapter control unit (309 or 409) and the adapter operation unit (310 and 410) may also be stopped. In this case, the accessory goes to sleep and does not restart until it is re-supplied after the accessory power is turned off.

For the accessory whose second communication stop information is "true", the camera control unit 205 does not communicate with the accessory by the second communication until the accessory power is re-supplied to the accessory after the accessory authentication communication. Therefore, the camera control unit 205 holds (stores) the second communication stop information until the power supply to the accessory is stopped. Then, when the power supply to the accessory is stopped, the second communication stop information held up to that point is initialized. If the accessory identification information acquired by the accessory authentication communication is unnecessary, the camera control unit 205 discards it.

Accessories that do not communicate by the second communication after the accessory authentication communication include an interchangeable lens that communicates with the camera control unit 205 only by the first communication, an intermediate adapter that does not have an operating member, and the like. Since the intermediate adapter having no operating member does not need to communicate in the normal operating state after the accessory authentication communication, it is not necessary to hold the adapter identification information for designating the communication target by P2P communication. However, in order for the camera control unit 205 to grasp the number of accessories connected to the camera body 20, it is necessary for the intermediate adapter to perform accessory authentication communication.

The timing at which the accessory stops the second communication may be the timing at which the accessory authentication communication with all the accessories ends, or the timing at which each accessory ends its own accessory authentication communication.

The camera control unit 205 grasps the number of accessories mounted on the camera body 20 while sequentially performing accessory authentication communication by the second communication with respect to the plurality of accessories mounted. From the viewpoint of power consumption and communication quality, when a predetermined number or more of accessories are installed, a warning operation to the user may be performed, or the functions of any of the accessories may be restricted.

The details of the process in which the camera control unit 205 acquires the second communication stop information from the accessory by the second communication will be described later. Since S403 and S404 are performed using different communication paths, the camera control unit 205 may perform these processes in parallel or sequentially in any order. The camera control unit 205 that has acquired the lens identification information, the accessory authentication information, and the second communication stop information in S403 and S404 proceeds to S405.

After that, the first communication is used for the communication in which the camera control unit 205 acquires the status information of the interchangeable lens 10 and the communication for transmitting the control parameters to the interchangeable lens 10, and the other communication is performed by the second communication. ..

In S405, the camera control unit 205 designates the accessory to be communicated by notifying the interchangeable lens 10 and the intermediate adapters 30 and 40 of the accessory identification information of the accessory to be communicated by broadcast communication. Then, the accessory detailed information is acquired by P2P communication from the communication target accessory whose second communication stop information is "false". The accessory detailed information includes information indicating the functions of each accessory, for example, operation function information such as having an operation member such as an operation ring or a slide switch and being able to change the optical characteristics by operating the operation member. Information about the user interface. In addition, the accessory detailed information includes information on the name of the accessory when it is recorded in the captured image file. Further, the accessory detailed information also includes communication request factors (which will be described later) that may occur in the accessory. As described above, the accessory detailed information includes various information about the corresponding accessory, and the amount of data is larger than the accessory authentication information.

In addition, since the accessory settings and states may change depending on the camera information such as the model and firmware version of the camera body 20, in this step, the camera control unit 205 transmits the camera information to the communication target accessory.

The data size of the accessory detailed information is larger than that of the information exchanged by the accessory authentication communication. However, since it is not necessary to exchange the accessory detailed information with the accessory whose second communication stop information is "true", the communication amount can be reduced by using the second communication stop information.

In S406, the camera control unit 205 sets an accessory whose second communication stop information is "false" in order to shift to the normal operating state. Here, the operation member of the accessory is set by the second communication, and the process will be described later. Further, here, the setting for the accessory whose second communication stop information is "true" is not performed.

The process of proceeding from the next S407 to S408 and returning to S407 indicates the normal operating state of the camera system. In the normal operating state, the camera control unit 205 resets the accessory by the second communication and acquires change information from the accessory. For the change information, for example, information on the amount of operation when the operating member of the accessory is operated, information indicating the change in the optical information when the optical member such as an ND filter is inserted, and reset processing of the accessory are executed. Information indicating that the reset process has been performed is included. To reset the accessory, as in S406, the camera control unit 205 notifies the accessory identification information of the communication target accessory by broadcast communication to specify the communication target accessory, and then P2P communication with the communication target accessory is performed. Will be done.

The camera control unit 205 may periodically inquire of the target accessory for change information. However, when the change information is information on the operation amount of the operation member, since the time during which the operation member is operated is limited, in most cases, a reply of "operation amount = 0" is returned. Therefore, in terms of not performing unnecessary communication, the accessory requests communication from the camera control unit 205 when the operating member is operated instead of polling, and the camera control unit 205 receives the communication request and changes information. It is preferable to obtain.

In S407, the camera control unit 205 determines whether or not it is necessary to change the accessory settings due to the user changing the settings in the camera body 20 or the like. When it is necessary to change the accessory setting, the camera control unit 205 proceeds to S406 to set the accessory again, and proceeds to S407 to return to the normal operation state again.

On the other hand, when it is not necessary to change the accessory setting in S407, the camera control unit 205 proceeds to S408. In S408, the camera control unit 205 determines whether or not there is a communication request from the accessory. The communication request from the accessory is made by setting the CS signal line to Low by the accessory. The camera control unit 205 may detect that the CS signal line has become Low by generating an interrupt when detecting an edge that goes down to Low, or by polling the level of the CS signal line. You may.

When the camera control unit 205 detects a communication request from the accessory, it proceeds to S409 and processes the communication request for the accessory whose second communication stop information is "false". First, the camera control unit 205 inquires about the factor that made the communication request to the accessory (hereinafter, referred to as the communication request factor). An accessory whose second communication stop information is "true" stops the second communication and does not make a communication request, so it is not necessary to inquire about the communication request factor. Then, when the camera control unit 205 receives the communication request factor as the second information corresponding to the communication request factor from the accessory, the camera control unit 205 performs processing according to the communication request factor and returns to S406.

By using the second communication stop information in this way, it is not necessary to perform extra (unnecessary) communication for setting or communication request for accessories that do not require communication. This makes it possible to reduce the time required to start the camera system and the time required to acquire change information from the accessories. In addition, the power consumption of the accessory that does not use the second communication can be suppressed.

In order to realize this, it is important that the accessory that has transmitted the second communication stop information keeps stopping the second communication until the power is turned on again. This is because if the accessory that has transmitted the second communication stop information enables the second communication by a trigger other than turning on the power again, the camera control unit 205 cannot detect it. Therefore, the accessory cannot be the target of communication for acquiring the setting and the communication request factor.

Next, the flowchart of FIG. 5 regarding the processing of the authentication communication as the initial communication performed by the camera body 20 (camera control unit 205) and the accessories (adapter control units 309, 409 and lens control unit 113) in S404 of FIG. It will be described using. In the authentication communication, the camera control unit 205 acquires the accessory authentication information from the accessory. As described above, the accessory authentication information includes the accessory identification information and the second communication stop information.

The camera control unit 205, which has started this process in S501, transmits an authentication information request as a first request to the adapter control unit 309 of the intermediate adapter 30 in S502 by a second communication.

Upon receiving the authentication information request in S503, the adapter control unit 309 proceeds to S506 and transmits the accessory authentication information of the intermediate adapter 30 to the camera control unit 205 by the second communication. The accessory authentication information includes accessory identification information and second communication stop information.

The second communication stop information indicates "true" if the intermediate adapter 30 stops the second communication after the end of the authentication communication, and indicates "false" if the second communication is not stopped. The termination information is information indicating that it is the termination of the second communication when viewed from the camera body 20. If the intermediate adapter 30 is the end of the second communication as viewed from the camera body 20, the end information is transmitted in addition to the accessory authentication information to indicate that the end information is "end".

In one-to-many communication such as the second communication, the destination can be specified by adding the accessory identification information to the beginning of the communication data. However, at the stage of S502, since the camera control unit 205 does not have any accessory information, the transmission destination cannot be specified by the communication data. Therefore, as an example of means for the camera body 20 to sequentially communicate with a plurality of accessories, a method using the second communication connection switches 311, 411 provided in the intermediate adapters 30 and 40 can be used as follows. It is assumed that the second communication connection switches 311, 411 are in the connected state in the normal operating state.

The camera control unit 205 notifies each accessory of the start information of this process by the broadcast communication in the second communication in S501. Since the second communication connection switches 311, 411 are in the connected state, each accessory receives the start information of this process.

Upon receiving the start information of this process, the adapter control units 309 and 409 switch the second communication connection switches 311, 411 to the disconnected state. As a result, only the adapter control unit 309 is connected to the camera control unit 205, and the data transmitted by the camera control unit 205 can be received. When the adapter control unit 309 that has completed the processing for the received data switches the second communication connection switch 311 to the connected state, the adapter control unit 409 of the intermediate adapter 40 can receive the data transmitted by the camera control unit 205. Will be. On the other hand, the adapter control unit 309 that has switched the second communication connection switch 311 to the connected state transmits from the camera control unit 205 until the end information of the main process transmitted by the camera control unit 205 is received in S522 where the main process ends. Do not respond to notifications.

After that, the adapter control unit 409, which has finished processing the received data, switches the second communication connection switch 411 to the connected state as described later, so that the lens control unit 113 receives the data transmitted by the camera control unit 205. You will be able to do it. In this way, the camera control unit 205 can sequentially communicate with a plurality of accessories.

In S504 and S505, since the second communication connection switch 311 is in the disconnected state, the adapter control unit 409 and the lens control unit 113 do not receive the authentication information request transmitted from the camera control unit 205.

In S506, the adapter control unit 309 transmits the accessory authentication information of the intermediate adapter 30 to the camera control unit 205 by the second communication. Then, the second communication connection switch 311 is switched to the connected state. As a result, as described above, the adapter control unit 409 can receive the data transmitted by the camera control unit 205.

The camera control unit 205 that has received the accessory authentication information from the intermediate adapter 30 in S507 proceeds to S508 and stores the received accessory authentication information. After this, the camera control unit 205 proceeds to S509. In S509, S511 and S513 to S515, the camera control unit 205 acquires the accessory authentication information from the intermediate adapter 40 as in S502, S503 and S506 to S508.

In S510, the adapter control unit 309 receives the authentication information request transmitted by the camera control unit 205, but does not respond because it has not received the end information of this process. Further, in S512, since the second communication connection switch 411 is in the disconnected state, the lens control unit 113 does not receive the authentication information request transmitted from the camera control unit 205 in S511.

This embodiment is an example in which a total of three accessories, one interchangeable lens 10 and two intermediate adapters 30 and 40, are connected to the camera body 20. However, only one intermediate adapter may be connected, or three or more may be connected. Since any number of intermediate adapters can be attached, it is preferable that the process of acquiring the accessory authentication information is completed by acquiring the termination information from the last accessory (interchangeable lens).

Also, the termination information from the last accessory may be obtained by another method. For example, as in S502 and S509, when the camera control unit 205 transmits an authentication information request to the accessory assuming that an intermediate adapter is attached, the termination information returned from the lens second communication unit 115 is used. You may be notified that the responding accessory is an interchangeable lens. Further, the intermediate adapter 40 may detect that it is terminated due to the connection state of terminals (not shown) and notify the camera body 20 of the termination information in S513. In this embodiment, a case where the end information is notified by the lens control unit 113 returning the accessory authentication information including the end information in response to the authentication information request from the camera control unit 205 will be described.

In S516, similarly to S502 and S509, the camera control unit 205 transmits the authentication information request to the accessory by the second communication. In S517 and S518, the adapter control units 309 and 409 do not respond because they have not received the end information of this process as in S510.

In S519, the lens control unit 113 that has received the authentication information request proceeds to S520 and transmits the accessory authentication information to the camera control unit 205 by the second communication. Since the interchangeable lens 10 is the end of the second communication when viewed from the camera body 20, the accessory authentication information from the lens control unit 113 includes the end information.

The camera control unit 205, which has received the accessory authentication information from the lens control unit 113 in S521, proceeds to S522 and stores the received accessory authentication information. Then, the camera control unit 205 proceeds to S523 according to the terminal information included in the stored accessory authentication information, ends the main process (authentication communication), and ends the main process by broadcast communication in the second communication. Notify each accessory.

The accessory whose second communication stop information is "true" stops the second communication according to the end information and does not respond to the second communication until the power is turned on again. When the accessory whose second communication stop information is "true" is the intermediate adapter (30 or 40), it is preferable that the operation of the adapter control unit (309 or 409) is also stopped in order to reduce the power consumption. When the accessory whose second communication stop information is "true" is the interchangeable lens 10, the second communication is stopped, but since the first communication can be used, the lens control unit 113 operates. Do not stop.

As described above, the camera body 20 sequentially communicates with the plurality of accessories 30, 40, 10 by using the second communication connection switches 311, 411. However, another method may be used as long as it can communicate with a plurality of accessories. For example, by detecting the voltage level of a terminal (not shown) to which the accessory is connected to itself, it is possible to grasp the number of the accessory attached from the camera body side. In this case, the number of authentication information requests transmitted from the camera body may be counted, and the accessory authentication information may be transmitted to the camera body only when it matches the mounting order of the camera body.

Next, in S405 of FIG. 4, the flow chart of FIG. 6 is used for the process of acquiring the accessory detailed information from the accessory in which the camera control unit 205 has not stopped the second communication by the second communication after the end of the authentication communication. explain. Here, it is assumed that the second communication stop information of the intermediate adapter 30 and the interchangeable lens 10 is "false", and the second communication stop information of the intermediate adapter 40 is "true".

The camera control unit 205, which has started this process in S601, proceeds to S602 and broadcasts the accessory identification information of the intermediate adapter 30 acquired in the authentication communication in the second communication in order to perform P2P communication with the intermediate adapter 30. Send to each accessory by. The accessory identification information of the intermediate adapter 30 is received by the intermediate adapter 30 and the interchangeable lens 10 in S603 and S605. In S604, since the intermediate adapter 40 has stopped the second communication, it does not receive the information transmitted by the broadcast communication.

The intermediate adapter 30 (adapter control unit 309) that has received its own accessory identification information in S603 proceeds to S606 and shifts to P2P communication. In S605, the interchangeable lens 10 (lens control unit 113) also acquires the accessory identification information of the intermediate accessory 30, but does not perform post-reception processing because it is different from its own accessory identification information. Further, the adapter control unit 309 performs the transition process to P2P communication in S606 before returning the CS signal line to High.

When the broadcast communication of the accessory identification information is completed in this way, the camera control unit 205 proceeds to S607 and transmits the above-mentioned camera information to the adapter control unit 309 by P2P communication. In S608, the adapter control unit 309 receives the camera information and proceeds to S611. In S609, the adapter control unit 409 does not receive the camera information because the second communication is stopped. Further, in S610, the lens control unit 113 does not receive the camera information because it has not received the accessory identification information of the interchangeable lens 10.

In S611, the adapter control unit 309 stores the received camera information. The adapter control unit 309 changes the setting of the intermediate adapter 30 based on the camera information, and if necessary, also changes the accessory detailed information transmitted to the camera control unit 205 in S615. The adapter control unit 309 that stores the camera information proceeds to S612 and transmits a camera information reception completion notification to the camera control unit 205.

Upon receiving the camera information reception completion notification in S613, the camera control unit 205 proceeds to S614 and transmits an accessory detailed information request to the adapter control unit 309 by P2P communication. The accessory detailed information request is received by the adapter control unit 309 in S615. However, in S616, the adapter control unit 409 does not receive the accessory detailed information request. Further, in S617, the lens control unit 113 does not receive the accessory detailed information request because the accessory identification information received in S605 is different from its own.

Upon receiving the accessory detailed information request, the adapter control unit 309 proceeds to S618 and transmits the accessory detailed information to the camera control unit 205 by P2P communication. The camera control unit 205 that has received the accessory detailed information in S619 proceeds to S620 and stores the accessory detailed information of the received intermediate adapter 30. The camera control unit 205 performs settings for the intermediate adapter 30 and processing for communication requests based on the accessory detailed information. The above is the process related to the detailed accessory information for the intermediate adapter 30.

The camera control unit 205, which has acquired the accessory detailed information of the intermediate adapter 30 which is the first accessory from the camera body 20 in S620, sends the camera control unit 205 to S621 in order to perform the same processing for the intermediate adapter 40 which is the second accessory. move on. However, since the second communication stop information of the intermediate adapter 40 is "true", the camera control unit 205 does not acquire the accessory detailed information from the intermediate adapter 40, but obtains the accessory detailed information from the interchangeable lens 10 which is the third accessory. Proceed to S622 to obtain.

Since the second communication stop information of the interchangeable lens 10 is "false", the camera control unit 205 acquires the accessory detailed information transmitted from the interchangeable lens 10 in S624 in the same manner as in S602 to S620 in S622. .. When the acquisition of the accessory detailed information is completed, the camera control unit 205 proceeds to S623 and performs this process because the accessory detailed information of all the accessories recognized that the second communication stop information is "false" in the authentication communication is acquired. To finish.

Next, in S406 of FIG. 4, the process of setting the accessory in which the camera control unit 205 does not stop the second communication by the second communication will be described with reference to the flowchart of FIG. Again, it is assumed that the second communication stop information of the intermediate adapter 30 and the interchangeable lens 10 is "false", and the second communication stop information of the intermediate adapter 40 is "true". Further, this process is performed not only after S405 of FIG. 4, but also when it is necessary to change the accessory setting due to the setting of the camera body 20 being changed by a user operation or the like.

The basic flow of this process is the same as the process of acquiring detailed accessory information in S405. First, the camera control unit 205, which started this process in S701, broadcasts the accessory identification information of the intermediate adapter 30 in S702. Notify accessories. The intermediate adapter 30 (adapter control unit 309) that has received its own accessory identification information in S703 shifts to P2P communication in S706. In S704, the intermediate adapter 40 (adapter control unit 409) whose second communication stop information is "true" does not receive the accessory identification information. Further, in S705, the interchangeable lens 10 (lens control unit 113) also receives the accessory identification information of the intermediate accessory 30.

Next, in S707, the camera control unit 205 transmits information (accessory setting information) regarding the setting of the intermediate adapter 30 to the adapter control unit 309. The adapter control unit 309, which has received the accessory setting information in S708, sets the operation of the intermediate adapter 30 and the like in S711 according to the accessory setting information, and returns the setting completion to the camera control unit 205 in S712. In S713, the camera control unit 205 receives the setting completion of the intermediate adapter 30. In S709, the adapter control unit 409 does not receive the accessory setting information. Further, in S710, the lens control unit 113 does not receive the accessory setting information because the accessory identification information received in S705 is different from its own. Further, the camera control unit 205 does not make the above settings for the intermediate adapter 40 (S714). Next, the camera body 20 transmits the accessory setting to the interchangeable lens 20. Next, in S715, the camera body 20 transmits the accessory setting to the interchangeable lens 20.

Next, in S716, the camera control unit 205 sets the interchangeable lens 10 in the same manner as the setting of the intermediate adapter 30 (S705, S710, S716). Then, in S717, since the settings of all the accessories whose second communication stop information is "false" are completed, the camera control unit 205 uses the second communication band (second communication band) in order to shift to the normal operating state. ) Is communicated to each accessory by broadcast communication. The adapter control unit 309 and the lens control unit 113 that have received this communication in S718 and S721 determine that the communication request is permitted. This communication request permission state continues until the (normal) broadcast communication is performed again from the camera control unit 205. In S719, the adapter control unit 409 does not receive the release notification of the second communication band.

Next, in S409 of FIG. 4, the camera control unit 205 confirms the communication request factor with respect to the accessory by the second communication, and performs the process according to the communication request factor by using the flowchart of FIG. explain. Again, it is assumed that the second communication stop information of the intermediate adapter 30 and the interchangeable lens 10 is "false", and the second communication stop information of the intermediate adapter 40 is "true". Further, it is assumed that the communication request is made from the intermediate adapter 30 and the communication request factor is that the adapter operation ring provided on the intermediate adapter 30 is operated.

The basic flow of this process is the same as the process of acquiring detailed accessory information in S405. First, the camera control unit 205, which started this process in S801, broadcasts the accessory identification information of the intermediate adapter 30 in S802. Notify accessories. The intermediate adapter 30 (adapter control unit 309) that has received its own accessory identification information in S803 shifts to P2P communication in S806. In S804, the intermediate adapter 40 (adapter control unit 409) whose second communication stop information is "true" does not receive the accessory identification information. Further, in S805, the interchangeable lens 10 (lens control unit 113) also receives the accessory identification information of the intermediate accessory 30.

Next, in S807, the camera control unit 205 transmits a communication request factor transmission request to the adapter control unit 309. The adapter control unit 309, which has received the communication request factor transmission request in S808, transmits the communication request factor to the camera control unit 205 in S811. In S809, the adapter control unit 409 does not receive the communication request factor transmission request. Further, in S810, the lens control unit 113 does not receive the communication request factor transmission request because the accessory identification information received in S805 is different from its own.

The camera control unit 205 that has received the communication request factor in S812 determines in S813 that the communication request factor is an operation of the adapter operation ring, and transmits a transmission request for the operation amount to the adapter control unit 309 in S814. To do. The adapter control unit 309, which has received the operation amount transmission request in S815, transmits the operation amount of the adapter device ring to the camera control unit 205 in S818. In S816, the adapter control unit 409 does not receive the operation amount transmission request. Further, in S817, the lens control unit 113 does not receive the operation amount transmission request because the accessory identification information received in S805 is different from its own.

The camera control unit 205 that has received the operation amount in S819 reflects the operation amount in the setting of the camera body 20 in S820. Specifically, when the adapter operation ring has a function of changing the aperture value (Av), the Av setting for calculating the exposure value (Ev) and the shutter speed (Tv) in the camera body 20 is changed. If necessary, the Av control amount may be transmitted to the interchangeable lens 10 by the first communication to cause the interchangeable lens 10 (lens control unit 113) to change the aperture value. Note that the camera control unit 205 does not transmit a communication request factor transmission request to the intermediate adapter 40 (adapter control unit 409) whose second communication stop information is "true" (S821).

Next, in S822, the camera control unit 205 transmits a communication request factor transmission request to the lens control unit 113. The camera control unit 205 has already acquired the communication request factor from the intermediate adapter 30, but since there is a possibility that the communication request factor is also generated in the interchangeable lens 10 at the same time, the communication request factor is also generated in the lens control unit 113. Inquire. If the communication request factor is generated in the interchangeable lens 10, the lens control unit 113 that has received the communication request factor transmission request in S823 transmits the communication request factor to the camera control unit 205.

When the acquisition of the communication request factor from all the accessories that can generate the communication request factor is completed in this way, the camera control unit 205 proceeds to S824 and broadcasts the release notification of the second communication band in order to shift to the normal operation state. Communicate with each accessory. The adapter control unit 309 and the lens control unit 113 that have received this communication in S825 and S828 determine that the communication request is permitted. This communication request permission state continues until the (normal) broadcast communication is performed again from the camera control unit 205. In S826, the adapter control unit 409 does not receive the release notification of the second communication band.

When the communication request factor occurs after receiving the communication request factor transmission request, the adapter control unit 309 and the lens control unit 113 make a communication request to the camera control unit 205 after receiving the notification of opening the second communication band. Specifically, it is a case where the operating member of the intermediate adapter 30 is operated between S818 and S825, and a case where a communication request factor other than the operation of the operating member occurs in the intermediate adapter 30 between S811 to S825. In these cases, the adapter control unit 309 makes a communication request to the camera control unit 205 after receiving the notification of opening the second communication band.

According to this embodiment, a first communication path that enables communication between the camera body 20 and the interchangeable lens 10 and communication between the camera body 20 and all accessories (interchangeable lens 10 and intermediate adapters 30, 40) are possible. Each has an independent second communication path. Through the second communication path, the setting of all accessories and the second communication in response to the communication request from these accessories are performed. The amount of communication can be reduced by specifying the accessory to be communicated based on the second communication stop information acquired by the authentication communication in the accessory setting and the response to the communication request.

On the other hand, the second communication by the accessory that has transmitted "true" as the second communication stop information can be stopped. An accessory having no communication means other than the second communication, such as the intermediate adapters 30 and 40 of the present embodiment, can stop the operation of the adapter control unit. By providing the second communication stop information in this way, the power consumption of the accessory can be reduced.
Further, the camera body 20 does not request the transmission of the accessory detailed information for the accessory whose second communication stop information acquired by the authentication communication is "true". Therefore, the accessory does not need to perform a process of determining the target of P2P communication based on the accessory identification information transmitted by broadcast communication, a process of inquiring about detailed accessory information, or the like, and may respond to the authentication communication. Also contributes to cost reduction of accessories.

Next, Example 2 of the present invention will be described. In the first embodiment, the process of acquiring the second communication stop information of each accessory in the authentication communication immediately after attaching each accessory to the camera body 20, and determining the accessory to be the target of the second communication thereafter based on the second communication stop information. explained. On the other hand, in this embodiment, the process when the second communication stop information is set to "true" after the transition to the normal operating state will be described.

When such processing is required, the product name and optical information of the accessory are notified to the camera body by the accessory detailed information, but when shifting to the normal operating state because the accessory setting and communication request do not occur. The accessory may stop the second communication. In addition, there are cases where the accessory shifts to a state in which it is not necessary to perform the second communication due to the change in the setting.

As a method of notifying the camera body that the accessory has stopped the second communication, there is a method in which the accessory makes a communication request to the camera body and notifies the camera body of the stop of the second communication as a communication request factor. Further, the state transition of the accessory and the stop of the second communication of the accessory are associated in advance, and the second communication of the accessory is stopped when the camera body makes a setting for the accessory accompanied by the stop of the second communication. There is also a way to determine that you are doing it. Further, there is a method of restarting the camera body from the authentication communication due to a communication error or a communication request factor.

Hereinafter, a method of notifying the stop of the second communication as a communication request factor will be described. In the process described with reference to FIG. 4 in the first embodiment, the communication request becomes possible when S406 ends, the release notification of the second communication band is notified to each accessory by broadcast communication, and the accessory receives the notification. (S717) later. Therefore, the accessory whose second communication stop information is "false" in the authentication communication needs to respond to the communication in the accessory detailed information acquisition process (S405) and the communication for setting the accessory (S406). When the accessory stops the second communication after transmitting the accessory detailed information to the camera body, the accessory makes a communication request to the camera body immediately after the processing of S406 is completed. Then, as a communication request factor, it notifies that the second communication stop information has changed from "false" to "true", and then stops the second communication. After receiving the communication request factor, the camera body does not perform the second communication with the accessory.

Further, when the accessory shifts to a state in which it is not necessary to perform the second communication due to the change in the setting, the same processing is performed. Specifically, the accessory settings are changed in S406 in response to the setting changes of the camera body and the like. When the S406 ends, each accessory is notified of the release of the second communication band by broadcast communication, so the accessory whose second communication stop information becomes "true" by the subsequent communication request notifies the camera body to that effect. To do.

In this way, the accessory whose second communication stop information is "false" at the time of authentication communication can notify the camera body at the timing when the second communication stop information becomes "true".

That is, the accessory can stop the second communication according to the state transition, and can notify the camera body that the second communication has been stopped. As a result, the second communication can be stopped after performing the necessary communication such as the communication of the accessory detailed information and the communication for setting the accessory, and the communication amount and the power consumption can be reduced, and the second communication can be performed. It is possible to communicate detailed accessory information by the communication of 2.

Next, Example 3 of the present invention will be described. In the first embodiment, the processing when the second communication stop information is "true" from the time of the authentication communication will be described, and in the second embodiment, the second communication stop information becomes "true" after the transition to the normal operation state. The processing of the case was explained. In this embodiment, when the second communication stop information of the accessory that has stopped the second communication changes from "true" to "false", a method of notifying the camera body of the change will be described.

The case where the second communication stop information changes from "true" to "false" is rare, but for example, when an accessory is affected by a disturbance and an unexpected reset process occurs. If an unexpected reset process occurs, the accessory will return to its initial state. Since the accessory in the initial state does not notify the camera body of the second communication stop information, the second communication is not stopped. In order for the accessory to stop the second communication, it is necessary to transmit the second communication stop information to the camera body. On the other hand, even if the accessory tries to send a communication request to the camera body to notify the second communication stop information, the camera body recognizes that the second communication of the accessory is stopped, so that the communication request factor Do not inquire. Therefore, in a normal communication request, it is not possible to notify the camera body that the accessory whose second communication stop information is "true" has changed to "false" for the second communication stop information.

Therefore, in this embodiment, it is agreed that the camera body will retry from the authentication communication when a communication error occurs in the broadcast communication. As a result, the accessory for which the reset process has occurred intentionally causes a communication error, so that the second communication stop information can be retransmitted to the camera body 20 in the authentication communication performed again.

The flowchart of FIG. 9 retransmits the second communication stop information to the camera body 20 by causing a communication error when an unexpected reset process occurs in the accessory that has stopped the second communication in the normal operation state. The processing will be described. The processing of S901 to S908 in FIG. 9 is the same as the processing of S401 to S408 of FIG.

It is assumed that an unexpected reset process occurs in the intermediate adapter 40 in which the second communication is stopped in the normal operating state in which the process proceeds from S907 to S908 and returns to S907. The intermediate adapter 40 (adapter control unit 409) in which the reset process has occurred sets the CS signal line to Low by turning on the ground switch 421. The camera body 20 (camera control unit 205) that has detected the Low of the CS signal line shifts from S908 to S909.

In S909, in order to acquire the communication request factor, the camera body 20 notifies each accessory of the accessory identification information of the intermediate adapter 30 in which the second communication stop information is “false” by broadcast communication (S802 in FIG. 8). At this time, if the intermediate adapter 40 keeps the CS signal line low, the broadcast communication that ends when the CS signal line becomes High does not end. Therefore, the camera body 20 and the accessory can determine the communication error when the CS signal line is provided with the allowable time in the Low state and the Low state exceeds the allowable time. When a communication error occurs in the broadcast communication of the first authentication communication of the communication request processing, the camera body 20 returns from S910 to S904 to perform the authentication communication. As a result, the camera body 20 can reacquire (re-receive) the second communication stop information from the intermediate adapter 40 in which an unexpected reset process has occurred. If the intermediate adapter 40 is restarted due to an unexpected reset as described above, the sleep state can be resumed by sending "true" as the second communication stop information. On the other hand, when "false" is transmitted as the second communication information, the camera body 20 is subject to accessory setting and communication request factor acquisition.

If there is no accessory whose second communication stop information is "false", the second communication unit of all accessories is stopped, so that a communication request cannot be generated. Therefore, the camera body 20 may determine that a communication error has occurred at the time when the communication request is generated, return to S904, and perform authentication communication.

In this embodiment, it is agreed that the authentication communication is performed again when a signal control different from the normal communication protocol is performed (that is, when a communication error occurs in the broadcast communication). Even if an unexpected reset process occurs in the accessory that has stopped communication and the second communication is restarted, the accessory can re-notify the camera body of the second communication stop information. Therefore, the second communication can be stopped again.

Further, when the accessory whose second communication is stopped wants to enable the second communication, the second communication stop information may be notified as "false" when the authentication communication is redone. At this time, the accessory sends a request to discard the second communication stop information to the camera body, and the camera body discards the received second communication stop information (“true”) in response to receiving this discard request. Then, the new second communication stop information (“false”) retransmitted by the accessory may be rereceived.

However, depending on the possibility and frequency of using the second communication, the "true" of the second communication stop information may be recognized as the communication target accessory of the second communication without being sent to the camera body 20. ..

In FIGS. 2 (a) and 2 (b), the case where the 3-wire clock synchronous communication is performed by the first communication circuit has been described, but instead, the 3-wire clock synchronous communication may be performed. FIG. 10 shows a signal waveform in 3-line pace synchronous communication. In the case of 3-line paced synchronous communication, an RTS communication line (RTS) is provided instead of the clock line (LCLK) shown in FIGS. 2 (a) and 2 (b). The RTS communication line transmits a signal for controlling the timing of communication by the camera-lens communication line (DCL) and communication by the lens-camera communication line (DLC) from the camera body (camera control unit) to the interchangeable lens (lens control unit). It is a signal line to do. For example, the RTS communication line is used for notification of a lens data transmission request (transmission instruction) from the camera body to the interchangeable lens, a communication processing switching request, and the like. The transmission request is notified by switching the signal level of the RTS communication line between High and Low. In the following description, the signal supplied to the RTS communication line is referred to as a transmission request signal RTS.

The transmission request signal RTS is sent from the camera body as the communication master to the interchangeable lens as the communication slave. When the interchangeable lens receives the transmission request signal RTS, the signal level of the lens data signal DLC is set to Low for a 1-bit period in order to notify the camera body of the start of transmission of one frame of the lens data signal DLC as shown in FIG. And. This 1-bit period is called a start bit ST indicating the start of one frame. That is, the data frame is started from this start bit ST. The start bit ST is provided in the first bit of each frame of the lens data signal DLC.

Subsequently, the interchangeable lens transmits 1 byte of lens data in an 8-bit period from the next 2nd bit to the 9th bit. The data bit array is the MSB first format, starting with the most significant data D7, followed by data D6, data D5, and ending with the lowest data D0. Then, the interchangeable lens adds a 1-bit parity information PA to the 10th bit, and sets the signal level of the lens data signal DLC during the period of the stop bit SP indicating the end of one frame to High. As a result, the data frame period started from the start bit ST ends.

According to each of the above embodiments, since the imaging device can identify the accessory device that does not require communication, unnecessary communication can be reduced and the immediacy of communication can be improved. Further, after identifying the accessory device that does not require communication, the accessory device shifts to the power saving state, so that the power consumption can be reduced.

Hereinafter, Example 5 will be described.
Focusing on the accessory identification information of the above-described embodiment, the description will be described in more detail.

Hereinafter, the accessory means an interchangeable lens or an intermediate accessory.

In the following examples, the camera body, the interchangeable lens, and the intermediate accessories are collectively referred to as a unit. In addition, each of the interchangeable lens and the intermediate accessory is also collectively referred to as an accessory.

Further, in the following embodiment, the accessory related to the correction is an interchangeable lens or an intermediate accessory for which the correction processing necessity information is "necessary".

Further, in the following embodiment, the intermediate accessory related to the correction is an intermediate accessory that needs to correct the optical information of the interchangeable lens.

Further, in the following embodiment, the first accessory is an accessory that holds optical information of all other accessories.

Further, in the following embodiment, the first intermediate accessory is an intermediate accessory having optical information of another intermediate accessory.

Further, in the following embodiment, the first unit is a unit that holds optical information of all accessories.

In addition. In the following examples, we focus on whether or not each unit has optical information of other units, but this is not necessarily related to the release date or manufacturing date of the unit. For example, the optical information stored in each unit may change regardless of the unit's release date or manufacturing date due to firmware upgrade or the like.

<Camera system configuration (Fig. 11)>
The configuration of the camera system of this embodiment will be described with reference to FIG.

The camera system has a first communication path which is a communication path for transmitting a control command from the camera body 2000 to the interchangeable lens 1000 and for transmitting operation information and optical information from the interchangeable lens 1000 to the camera body 2000. It also has a second communication path, which is a communication path for transmitting operational information and optical information between the camera body 2000 and the plurality of intermediate accessories 3000 and 4000. Hereinafter, the communication performed by the first communication path is also referred to as a first communication (first communication), and the communication performed by the second communication path is also referred to as a second communication (second communication).

Here, the first communication path is the mounts 20200 and 30500, 30300 and 40500, 40300 and 10200, which will be described later, for mutual communication between the first communication unit 20700 on the camera side and the first communication unit 11400 on the lens side. It is a route performed via. The first communication unit 20700 on the camera side and the first communication unit 11400 on the lens side are examples of communication control means, respectively.

In this embodiment, the communication performed by a certain unit with one unit different from the unit is also referred to as one-to-one communication.

Further, here, the second communication path is a path through which the second communication unit 20800 on the camera side communicates with the communication unit of each accessory. At that time, communication is performed from the second communication unit 20800 on the camera side via the mounts 20300 and 30600, and communication is performed via at least a part of the mounts 30400 and 40600, 40400 and 10300. According to the second communication path, the communication unit 208 on the camera side communicates with, for example, the second communication unit 11500 on the lens side and the second communication units 30800 and 40800 on the intermediate accessory side. The communication unit 20800 on the camera side, the second communication unit 11500 on the lens side, the second communication unit 30800 on the intermediate accessory side, and 40800 on the intermediate accessory side are examples of communication control means, respectively.

In this embodiment, communication performed by a unit with a plurality of units different from the unit is also referred to as one-to-many communication.

In FIG. 11, the interchangeable lens 1000 is an interchangeable lens that controls a movable optical member for photographing. The camera body 2000 is a camera body that captures images. The intermediate accessory 3000 and the intermediate accessory 4000 are intermediate accessories such as an extender mounted between the interchangeable lens 1000 and the camera body 2000.

Mounts 10100 and 40100, 40200 and 30100, and 30200 and 20100 are detachably attached to the interchangeable lens 1000, the intermediate accessory 4000, the intermediate accessory 3000, and the camera body 2000, respectively. Here, the mount 10100 is provided on the interchangeable lens 1000, the mount 40100 and the mount 40200 are provided on the intermediate accessory 4000, the mount 30100 and the mount 30200 are provided on the intermediate accessory 3000, and the mount 20100 is provided on the camera body 2000. ..

Mounts 10100, 40100, 40200, 30100, 30200, 20100 have first communication contact groups 10200, 40300, 40500, 30300, 30500, which are contact terminal groups having one or more contacts for performing first communication, respectively. 20200 is provided. Here, the first communication contact groups 10200, 40300, 40500, 30300, 30500, and 20200 are configured to be conductive when the interchangeable lens 1000, the intermediate accessory 3000, the intermediate accessory 4000, and the camera body 2000 are connected. In the fifth embodiment, the first communication is also used for the camera body 2000 to control the optical member of the interchangeable lens 1000.

Further, the mounts 10100, 40100, 40200, 30100, 30200, and 20100 have the second communication contact group 10300, 40400, 40600, and 30400, which are contact terminal groups having one or more contacts for performing the second communication, respectively. 30600 and 20300 are provided. Here, the second communication contact groups 10300, 40400, 40600, 30400, 30600, and 20300 are configured to be conductive when the interchangeable lens 1000, the intermediate accessory 3000, the intermediate accessory 4000, and the camera body 2000 are connected. In the fifth embodiment, the second communication is configured so that the camera body 2000 can perform one-to-many communication with the intermediate accessory 3000, the intermediate accessory 4000, and the interchangeable lens 1000.

As described above, the first communication, which is one-to-one communication between the camera body 2000 and the interchangeable lens 1000, and the second communication, which is a one-to-one communication between the camera body and the plurality of accessories, are different. A communication path 1 and a second communication path are provided. As a result, the interchangeable lens control command can be transmitted to the interchangeable lens at a more intended timing, for example, in the first communication, as compared with the case where the communication is performed using the same communication path. Since the interchangeable lens control command transmission can be immediately transmitted to the interchangeable lens at the timing intended by the camera body, it is possible to control a plurality of optical members mounted on the interchangeable lens at high speed and with high accuracy.

The interchangeable lens 1000 controls the focus lens 10400, the zoom lens 10500, the iris 10600, the blur correction lens 10700, the control units (10800, 10900, 11000, 11100) that control each optical member, and the entire lens that constitute the optical system. The lens control unit 11300 is provided. Further, the interchangeable lens 1000 includes a first communication unit 11400 on the lens side that performs the first communication, a second communication unit 11500 on the lens side that performs the second communication, a blur amount detection unit 11200 that detects the amount of blur, and an interchangeable lens. The lens operating member 11600, which is an provided operating member, is provided. Each configuration will be described.

The focus lens 10400 is for changing the focus state of the captured image. The zoom lens 10500 is for zooming a captured image. The iris 10600 is for adjusting the amount of light of the captured image. The blur correction lens 10700 is a blur correction lens for correcting image blur of a subject image.

The focus lens control unit 10800 performs position detection and drive control of the focus lens 10400. The zoom lens control unit 10900 performs position detection and drive control of the zoom lens 10500. The iris control unit 11000 performs position detection and drive control of the iris 10600. The blur correction control unit 11100 is a blur correction control unit for performing position detection and drive control of the blur correction lens 10700. The focus lens control unit 10800, zoom lens control unit 10900, iris control unit 11000, and blur correction control unit 11100 are each composed of, for example, a position sensor such as an absolute value encoder and a drive motor such as an ultrasonic motor or a stepping motor. The blur amount detecting unit 11200 is for detecting the vibration amount of the interchangeable lens 1000, and is composed of, for example, a gyro sensor.

The lens control unit 11300 is for controlling the lens and has a memory (not shown). The lens control unit 11300 is an example of a communication control unit. The first communication unit 11400 on the lens side is for performing the first communication with the interchangeable lens 1000. The second communication unit 11500 on the lens side is for performing the second communication with the interchangeable lens 1000.

The memory included in the lens control unit 11300 is composed of a rewritable non-volatile memory, and stores specific information and state information regarding the control software (firmware) executed by the CPU and the interchangeable lens 1000. The unique information is, for example, a model name (identification information), optical characteristics, correction information, and the like. The state information includes, for example, the operating state (normal / safe mode), the position information (or magnification) of the zoom lens 10500, the position information of the focus lens 10400, the F value of the iris 10600, the position information of the blur correction lens 10700, the firmware version, and the like. Update status, etc. However, it is not limited to these. Further, the memory also stores a program to be executed when the interchangeable lens 1000 is operated in the safe mode described later.

Further, the lens control unit 11300 has a programmable processor such as a CPU, and realizes various operations including the operation of the interchangeable lens 1000 described later by reading a program from the memory and executing the program. For example, the lens control unit 11300 executes an operation in response to a command received from the camera control unit 20500 in the first communication described later. The operation in response to the command is, for example, to control the focus lens control unit 10800, the zoom lens control unit 10900, the iris control unit 11000, and the blur correction control unit 11100, and to update the firmware stored in the memory.

The lens control unit 11300 updates the firmware by overwriting the old firmware stored in the memory with, for example, the new firmware received from the camera body 2000 in the first communication. Further, the lens control unit 11300 manages the update process by recording data (update state data) indicating the state of the firmware update process in the memory. For example, the lens control unit 11300 sets the update status data to a value indicating "incomplete" before overwriting the firmware, and sets the update status data to a value indicating "completed" when the overwriting of the firmware is completed. The value indicating "completed" may be different between the value indicating "normal completion" and the value indicating "abnormal completion". Further, the value indicating "abnormal completion" may be a different value depending on the cause of the abnormality.

For example, if the interchangeable lens 1000 is removed during the firmware update, the power supply to the interchangeable lens 1000 is cut off, so that the update process is interrupted with the update status data having a value indicating "incomplete". For example, the lens control unit 11300 confirms the update status data when the power is supplied again, and if it is a value indicating an incomplete status, the firmware update is interrupted and the operation is restricted. It shifts to the mode (safe mode). In addition, the operating state of the interchangeable lens 1000 stored in the memory is rewritten to the safe mode. In safe mode, only limited functions can be performed, including the processing required to update the firmware. Specifically, the process required to update the firmware is a process of transmitting the identification information and the operating state information (or the request for firmware update) of the interchangeable lens 1000 to the camera body 2000. Further, the process of updating the firmware recorded in the memory with the firmware received from the camera body 2000 is also a process necessary for updating the firmware.

Other processing, such as control of the focus lens control unit 10800, cannot be performed.

Normally, the memory capacity is not large enough to store the entire firmware in duplicate. Therefore, the capacity that can be used for storing programs for safe mode is limited. Therefore, in safe mode, only limited functions are provided, including the minimum necessary functions such as transmission of the operating state of the interchangeable lens 1000 and firmware update. When the lens control unit 11300 receives a request for processing that cannot be executed in the safe mode, such as a drive request for the focus lens 10400, in the first communication during the safe mode, the lens control unit 11300 ignores the request. The lens operating member 11600 is an operating member provided on the interchangeable lens 1000, and is, for example, a switch or an electronic ring. When the lens operating member 11600 is operated, an operation signal is output to the lens control unit 11300.

Next, the configuration of the camera body 2000 will be described. The camera body 2000 includes an image sensor 20400, a camera control unit 20500 that controls the camera body, an image display unit 20600 that displays images taken by the camera body 2000, and a camera operation member 20900 that is an operation member provided on the camera body 2000. To be equipped with. Further, the camera body 2000 includes a camera-side first communication unit 20700 and a camera-side second communication unit 20800 that control the first communication and the second communication. Each configuration will be described.

The image sensor 20400 is an image sensor for capturing an image, for example, a CMOS image sensor.

The camera control unit 20500 is for controlling the camera body, and has a memory (not shown). The camera control unit 20500 is an example of a communication control unit. The first communication unit 20700 on the camera side is for performing the first communication with the camera body 2000. The second communication unit 20800 on the camera side is for performing the second communication with the camera body 2000. The camera control unit 20500, the camera-side first communication unit 20700, and the camera-side second communication unit 20800 are configured by using, for example, a CPU in the camera body 2000.

The image display unit 20600 is, for example, a liquid crystal monitor, and is used for displaying an image taken by the camera body 2000, image data recorded on the recording medium 21100, a GUI, and the like. At this time, the image display unit 20600 is also used for displaying a menu for the user to instruct the user to update the firmware of the interchangeable lens 1000 or the intermediate accessories 3000 and 4000. Further, when the camera control unit 20500 detects that the mounted interchangeable lens 1000 and the intermediate accessories 3000 and 4000 are in the safe mode, the camera control unit 20500 can notify the user by displaying a message or the like that the firmware needs to be updated. ..

The camera operating member 20900 is for setting shooting conditions, for example, a dial ring or a switch. When the camera operating member 20900 is operated, an operation signal is output to the camera control unit 20500.

The media IF21000 is an interface for recording and reading data from, for example, a recording medium 21100 which is a removable memory card.

The recording medium 21100 is used as a recording destination for image data and audio data obtained by shooting with the camera body 2000. The recording medium 21100 is also used as a new firmware supplier when updating the firmware of the camera body 2000, the interchangeable lens 1000, and the intermediate accessories 3000 and 4000.

Each of the intermediate accessories 3000 and 4000 includes intermediate accessory optical members 30700 and 40700, intermediate accessory side second communication units 30800 and 40800 for performing second communication, and 30900 and 40900 for controlling intermediate accessories. Further, each of the intermediate accessories 3000 and 4000 includes intermediate accessory operating members 31000 and 41000, which are operating members provided on the intermediate accessories. Each configuration will be described.

As an example, the intermediate accessory optical members 30700 and 40700 of this embodiment are optical members that bring about changes in optical characteristics with respect to a captured image, such as a variable magnification lens and an ND filter.

The second communication units 30800 and 40800 on the intermediate accessory side are communication units for performing the second communication with the intermediate accessory 3000 and the intermediate accessory 4000.

The intermediate accessory control units 30900 and 40900 are control units for controlling the intermediate accessory 3000 and the intermediate accessory 4000, respectively, and have a memory (not shown). The intermediate accessory control units 30900 and 40900 are examples of communication control units, respectively. The intermediate accessory control units 30900 and 40900, and the intermediate accessory side second communication units 30800 and 40800 are configured by using the CPU of the intermediate accessory.

The memories of the intermediate accessory control units 30900 and 40900 are composed of rewritable non-volatile memories, and store unique information and state information regarding the control software (firmware) executed by the CPU and the intermediate accessories 3000 and 4000. The unique information is, for example, a model name (identification information), optical characteristics, correction information, and the like. Further, the state information includes, for example, an operating state (normal / safe mode), operating information (position and speed) of the intermediate accessory operating members 31000 and 41000, a firmware version and an updated state, and the like. However, it is not limited to these. Further, the memory also stores a program to be executed when operating the intermediate accessories 3000 and 4000 in the safe mode described later.

Further, the intermediate accessory control units 30900 and 40900 have a programmable processor such as a CPU, and by reading a program from the memory and executing the program, various operations including the operations of the intermediate accessories 3000 and 4000 described later are realized. To do. For example, the intermediate accessory control units 30900 and 40900 operate in response to a command received from the camera control unit 20500 in the second communication described later, for example, transmit operation information of the intermediate accessory operation members 31000 and 41000, and the firmware stored in the memory. Perform the update.

The intermediate accessory control units 30900 and 40900 update the firmware by overwriting the old firmware stored in the memory with, for example, the new firmware received from the camera body 2000 in the first communication. Further, the intermediate accessory control units 30900 and 40900 manage the update process by recording the data (update state data) indicating the state of the firmware update process in the memory. For example, the intermediate accessory control units 30900 and 40900 set the update status data to a value indicating "incomplete" before overwriting the firmware, and set the update status data to a value indicating "completed" when the overwriting of the firmware is completed. The value indicating "completed" may be different between the value indicating "normal completion" and the value indicating "abnormal completion". Further, the value indicating "abnormal completion" may be a different value depending on the cause of the abnormality.

For example, if the intermediate accessories 3000 and 4000 are removed during the firmware update, the power supply to the intermediate accessories 3000 and 4000 is cut off, so the update process is interrupted with the update status data indicating "incomplete". Firmware. For example, the intermediate accessory control units 30900 and 40900 confirm the update status data when the power is supplied again, and if the value indicates the incomplete status, the intermediate accessory control units 30900 and 40900 shift to the mode in which the operation is restricted (safe mode). .. In addition, the 00 operating state of the intermediate accessories 3000 and 40 stored in the memory is rewritten to the safe mode.

In safe mode, only limited functions can be performed, including the processing required to update the firmware. The processing required to update the firmware is specifically, the identification information of the intermediate accessories 3000 and 4000 and the authentication information such as the information indicating the safe mode (or the request for the firmware update) are sent to the camera body 2000. This is the process of sending. Further, the process of updating the firmware recorded in the memory with the firmware received from the camera body 2000 is also a process necessary for updating the firmware. Other processing, such as transmission of operation information of the intermediate accessory operating members 31000 and 41000, cannot be performed.

Normally, the memory capacity is not large enough to store the entire firmware in duplicate. Therefore, the capacity that can be used for storing programs for safe mode is limited. Therefore, safe mode provides only limited functionality, including the minimum required functionality such as sending operating status of intermediate accessories 3000 and 4000 and updating firmware. The intermediate accessory control units 30900 and 40900 ignore the request for processing that cannot be executed in the safe mode in the second communication during the safe mode, for example, when the operation information of the intermediate accessory operating members 31000 and 41000 is transmitted and received.

The intermediate accessory operating members 31000 and 41000 are operating members provided on the intermediate accessory 3000 and the intermediate accessory 4000, respectively, such as a switch or an electronic ring. When the intermediate accessory operating members 31000 and 41000 are operated, operation signals are output to the intermediate accessory control units 30900 and 40900.

The second communication connection switch 31100 and the second communication connection switch 41100 are switches provided on the second communication line of the intermediate accessory 3000 and the intermediate accessory 4000, respectively, and on the lens side of the intermediate accessory side second communication unit. The second communication connection switch 31100 and the second communication connection switch 41100 can be controlled for short-circuiting and opening by the intermediate accessory control unit 30900 and the intermediate accessory control unit 40900, respectively. By providing these, it is possible to block the second communication on the lens side from itself. That is, it is possible to change the communication state of the second communication by controlling the short circuit / release of these switches.

In the fifth embodiment, the flow until the light incident on the interchangeable lens 1000 is output as an image is as follows.

The light incident on the interchangeable lens 1000 passes through the focus lens 10400, the zoom lens 10500, the iris 10600, the blur correction lens 10700, and the intermediate accessory optical members 40700 and 30700, is imaged by the image pickup element 20400, and is converted into an electric signal. The electric signal output from the image sensor 20400 is changed into a video signal by the camera control unit 20500 and output to the video display unit 20600.

<First communication (Fig. 12)>
Next, the first communication will be described with reference to FIG.

FIG. 12A shows a configuration in which the first communication is performed. The first communication of this embodiment illustrates the case of performing clock synchronous communication, but pace synchronous communication may be performed. The pace-synchronized communication will be described later as a modified example. The first communication contact groups 10200, 40300, 40500, 30300, 30500, and 20200 have the first communication LCLK terminals 10200a, 40300a, 40500a, and 30300a, which are the clock line LCLK terminals output from the camera-side first communication unit 20700, respectively. , 30500a, 20200a are included. In this embodiment, the first communication DCL terminals 10200b, 40300b, 40500b, 30300b, 30500b, and 20200b, which are the terminals of the data line DCL output from the camera-side first communication unit 20700 of the clock synchronous communication, are also included. There is. Each of the first communication DCL terminals 10200b, 40300b, 40500b, 30300b, 30500b, and 20200b is an example of the first communication terminal. Similarly, the first communication DLC terminals 10200c, 40300c, 40500c, 30300c, 30500c, and 20200c, which are the terminals of the data line DLC output from the lens-side first communication unit 11400 of the clock synchronous communication, are included. Each of the first communication DLC terminals 10200c, 40300c, 40500c, 30300c, 30500c, and 20200c is an example of the third communication terminal.

As shown in FIG. 12A, the clock line LCLK and the data line DCL are pulled up in the interchangeable lens 1000. Further, the clock line LCLK and the data line DLC are pulled up in the camera body 2000.

The clock line LCLK, data line DCL, and data line DLC in the intermediate accessory 3000 and the intermediate accessory 4000 are short-circuited between the first communication contacts 40300 and 40500 and 30300 and 30500, respectively.

FIG. 12B shows the waveforms of the clock line LCLK, the data line DCL, and the data line DLC when the first communication is performed. The first communication unit 20700 on the camera side outputs a clock to the clock line LCLK and outputs 8-bit data of B7 to B0 to the data line DCL in accordance with the rising signal of the clock line LCLK. Similarly, the lens-side first communication unit 114 outputs 8-bit data of B7 to B0 to the data line DLC in accordance with the rising signal of the clock line LCLK. Further, the first communication unit 20700 on the camera side receives 8-bit data of B7 to B0 of the data line DLC in accordance with the rising signal of the clock line LCLK. Similarly, the lens-side first communication unit 11400 receives 8-bit data of B7 to B0 of the data line DCL in accordance with the rising signal of the clock line LCLK. As described above, the camera-side first communication unit 207 and the lens-side first communication unit 114 can exchange communication data with each other. When the first communication unit 11400 on the lens side receives 8-bit data of B7 to B0 of the data line DCL, it outputs the clock line LCLK for the Tbusy time LOW, and then releases the LOW output. Here, the Tbusy time is the time during which the interchangeable lens 10 is processing the received data, and the first communication unit 20700 on the camera side does not transmit the data until the clock line LCLK changes from LOW to HIGH after the data is transmitted. ing. By this signal control, the flow control of the first communication can be performed. By repeating the above processing, data can be transmitted between the first communication unit 20700 on the camera side and the first communication unit 114 on the lens side by the first communication.

<Second communication (Fig. 21)>
Next, referring to the configuration diagram of FIG. 21, one of the communication circuits capable of "one-to-many" communication configured between the camera body 2000, the interchangeable lens 1000, the intermediate accessory 3000, and the intermediate accessory 4000. Will be described. The communication circuit is not limited to this as long as "one-to-many" communication is possible. Further, when a plurality of communication circuits are provided, "one-to-one" communication such as clock-synchronous serial communication or UART communication may be used for other communication circuits.

The second communication unit 20800 on the camera side, the second communication unit 115 on the lens side, and the second communication units 30800 and 40800 on the intermediate accessory are connected via the contact portion as in the first communication. More specifically, it is connected via the above-mentioned second communication contact group second communication contact group 10300, 40400, 40600, 30400, 30600, 20300. In this embodiment, the second communication contact groups 10300, 40400, 40600, 30400, 30600, 20300 have CS signal terminals 10300a, 40400a, 40600a, 30400a, 30600a, 20300a and DATA signal terminals 10300b, 40400b, 40600b, 30400b, 30600b, respectively. , 20300b. The camera-side second communication unit 20800, the lens-side second communication unit 11500, and the intermediate accessory second communication unit 30800 are a CS signal line connected via a CS signal terminal and a DATA signal line connected via a DATA signal terminal. Communicate using.

The DATA signal terminals of the second communication contact groups 10300, 40400, 40600, 30400, 30600, and 20300 are examples of the second communication terminals.

The camera communication circuit is composed of a ground switch 22100 and an input / output changeover switch 22200. The lens communication circuit is composed of a ground switch 12100 and an input / output changeover switch 12200. The intermediate accessory communication circuit is composed of grounding switches 32100 and 42100 and input / output selector switches 32200 and 42200.

There are two signal lines: a CS signal line (first signal line) for propagating signals for controlling the flow of communication, and a DATA signal line (second signal line) for propagating data to be transmitted and received. Consists of books.

The CS signal line is connected to the camera side second communication unit 20800, the intermediate accessory second communication unit 30800, and the lens side second communication unit 11500, and has a configuration capable of detecting the state (Hi / Low) of the signal line. .. Further, the CS signal line is pulled-up connected to a power source (not shown) in the camera body. The CS signal line is configured to be connectable to GND via the ground switch 12100 of the interchangeable lens 1000, the ground switch 22100 of the camera body 2000, and the ground switches 32100 and 42100 of the intermediate adapter (open drain connection). With this configuration, the interchangeable lens 1000, the camera body 2000, and the intermediate accessories 3000 and 4000 can each be turned on (connected) to the ground switch to set the state of the CS signal line to Low. On the other hand, the state of the CS signal line can be set to Hi by turning off (cutting off) the respective connection switches of the interchangeable lens 1000, the camera body 2000, and the intermediate accessories 3000 and 4000. The CS signal line is used to distinguish between broadcast communication and P2P communication, or to switch the communication direction in P2P communication.

The DATA signal line is a single bidirectional data transmission line that can be used while switching the data propagation direction. The DATA signal line can be connected to the second communication unit 11500 on the lens side via the input / output changeover switch 12200 of the interchangeable lens 1000. Further, the DATA signal line can be connected to the second communication unit 20800 on the camera side via the input / output changeover switch 22200 of the camera body 2000. Further, the DATA signal line can be connected to the intermediate accessory second communication units 30800 and 40800 via the input / output selector switches 32200 and 42200 of the intermediate accessories 3000 and 4000, respectively. Each microcomputer is provided with a data output unit (CMOS method) for transmitting data and a data input unit (CMOS method) for receiving data. By operating the input / output changeover switch, it is possible to select whether to connect the DATA signal line to the data output unit or the data input unit. With this configuration, the interchangeable lens 1000, the camera body 2000, and the intermediate accessories 3000 and 4000 each operate the input / output selector switch so as to connect the DATA signal line to the data output unit when transmitting data. Transmission becomes possible. On the other hand, when the interchangeable lens 1000, the camera body 2000, and the intermediate accessories 3000 and 4000 receive data by themselves, the data can be received by operating the input / output changeover switch so as to connect the DATA signal line to the data input unit. It will be possible.

Here, broadcast communication and P2P communication performed by CS signals and data signals will be described.

The CS signal line drops to LOW when any unit is connected to GND, so it is used as a trigger for broadcast communication.

Broadcast communication is started when the camera body, which is the main body of communication, draws a CS signal line to LOW. When the CS signal line is LOW, the data received by the accessory by the DATA line is determined to be broadcast data.

In addition, each accessory can request broadcast communication from the camera body by drawing a CS signal line to LOW.

The unit that has detected the LOW of the CS signal line can inform other units that the processing for the broadcast communication is continuing by turning on its own ground switch during the broadcasting processing. By defining that the second communication starts with the broadcast communication and ends with the broadcast communication, the DATA signal line of the accessory basically needs to maintain the reception state. When the camera performs P2P communication with an accessory, the accessory to be communicated is first specified by broadcast communication. The camera and the designated accessory that have completed the transmission of broadcast communication perform P2P communication.

In P2P communication, the camera first transmits data, and the accessory that receives the data transmits the data to the camera. After that, this is done alternately. In P2P communication, the CS signal during communication is distinguished from broadcast communication by maintaining HIGH. The CS signal in P2P communication is used as a busy signal. That is, the camera and the accessory are set to LOW to notify the other party that the data transmission from the other party is completed, and set to HIGH to notify that the data reception is ready.

When the P2P communication is completed, the camera broadcasts the end of the P2P communication.

In this way, the camera can perform data communication via a plurality of accessories and two communication lines.

Although FIG. 21 shows an example of the communication circuit in the present invention, the present invention is not limited to this. For example, the CS signal line is pull-down connected to GND in the camera body 2000, and is not shown via the ground switch 12100 of the interchangeable lens 1000, the ground switch 22100 of the camera body 2000, and the ground switches 32100 and 42100 of the intermediate accessories 3000 and 4000. It may be configured so that it can be connected to a power supply. Further, the DATA signal line may be configured to be always connected to each data input unit, and the connection / disconnection between the DATA signal line and each data output unit may be operated by a switch.

The second communication can be realized by the same communication method as the first communication, bidirectional synchronous communication, master / slave method, token passing method, or the like.

<Initial communication with accessories and acquisition processing of corrected optical information (Fig. 13)>
Next, the flow in which the camera body 2000 acquires the authentication information of the accessory by the initial communication with the accessory, and further acquires the optical information of the interchangeable lens 1000 corrected based on the optical information of the intermediate accessory 3000 and the intermediate accessory 4000. 13 will be described. The optical information of the intermediate accessory is, for example, a magnification that changes when the intermediate accessory has a variable magnification lens by inserting the intermediate accessory. The optical information of the interchangeable lens 1000 is, for example, information such as a focal length, an aperture, a focus sensitivity, and a focus correction amount.

FIG. 13 shows a process in which the camera body 2000 acquires the optical information of the interchangeable lens 1000 corrected based on the optical information of the intermediate accessory 3000 and the intermediate accessory 4000 after the power is supplied for the first time after the intermediate accessory and the interchangeable lens are attached. Shows the flow of.

When the camera body 2000 is started in S30100, the transition to S30200 occurs.

Upon transition to S30200, the camera body 2000 supplies power to the interchangeable lens 1000, the intermediate accessory 3000, and the intermediate accessory 4000 via a power supply mount contact (not shown), and transitions to S30300 and S30400.

Upon transition to S30300, the camera control unit 20500 performs initial communication with the interchangeable lens 1000 in the first communication. In the initial communication, the authentication information of the interchangeable lens 1000 is acquired.

Here, the authentication information of the interchangeable lens 1000 includes the identification information of the interchangeable lens 1000 and the operating state information. The interchangeable lens identification information may be information such as a model number (ID) used for identifying the type (model) of the interchangeable lens, or optical data identification information indicating optical data peculiar to the interchangeable lens. .. In addition, it may include information indicating the function of the interchangeable lens and information such as a manufacturing number (serial number) that can identify an individual in the same model.

The operating state information is information that can identify whether the interchangeable lens 1000 is operating normally or in safe mode. In other words, whether or not the firmware update is interrupted (operating in safe mode). Information that can identify (normal operation).

The flow of the sub-process S30300 for acquiring the authentication information of the interchangeable lens 1000 in the first communication will be described later with reference to FIG.

Upon transition to S30400, the camera control unit 20500 performs initial communication with the accessory in the second communication and acquires the authentication information of the accessory.

Here, the accessory authentication information includes accessory identification information, correction processing necessity information, and operating state information.

The intermediate accessory identification information may be information such as a model number (ID) used for identifying the type (model) of the intermediate accessory, or optical data identification information indicating optical data unique to the intermediate accessory. .. In addition, it may include information indicating the function of the intermediate accessory and information such as a manufacturing number (serial number) that can identify an individual in the same model.

Further, the correction processing necessity information is information indicating whether or not the optical information of the interchangeable lens 1000 needs to be corrected by mounting the accessory. If the accessory is an intermediate accessory and does not affect the optical system of the interchangeable lens 1000, the correction process is not necessary. If the camera control unit 20500 knows in advance that the correction process by mounting the intermediate accessory is unnecessary based on the intermediate accessory correction process necessity information, the camera ignores the intermediate accessory in the process of acquiring the optical information of the interchangeable lens 1000. can do.

As an intermediate accessory that does not require correction processing, for example, there is an intermediate accessory that is provided with an optical member optically designed to cancel the influence of its own width on the optical system and is attached for the purpose of adding an operating member. Another example is a mount converter that changes the flange back length suitable for the camera body by mounting it between an interchangeable lens with a short flange back mount and the camera body.

The operating status information is information that can identify whether the intermediate accessories 3000 and 4000 are operating normally or in safe mode. In other words, whether the firmware update is interrupted (operating in safe mode) or not. It is information that can identify whether or not (normal operation).

The flow of the sub-process S30400 for acquiring the authentication information of the intermediate accessory in the second communication will be described later with reference to FIG. Since S30300 and S30400 use different communication paths, the processes may be performed in parallel or sequentially.

When the authentication information of the interchangeable lens and the authentication information of the attached accessory are acquired by S30300 and S30400, the process proceeds to S305.

Upon transition to S30500, the camera control unit 20500 determines whether or not there is an intermediate accessory that requires correction of the optical information of the interchangeable lens based on the correction processing necessity information acquired in S30400. If an intermediate accessory (also referred to as an intermediate accessory related to the correction) whose correction processing necessity information is "necessary" is attached, the process proceeds to S30600.

Upon transition to S30600, the camera control unit 20500 determines whether or not there is an accessory in which the camera control unit 20500 does not have optical information among the interchangeable lens and the intermediate accessory whose correction processing necessity information is "necessary" in S30500. To judge. In addition, the intermediate accessory whose correction processing necessity information is "necessary" in the interchangeable lens and S30500 is also referred to as an accessory related to correction. If the camera control unit 20500 has accessories related to correction that the camera control unit 20500 does not have optical information, the camera control unit 20500 cannot correct the optical information of the interchangeable lens. In this case, the process proceeds to S30700 in order to search for a request destination for correction processing.

Upon transition to S30700, the camera control unit 20500 determines an accessory (also referred to as a first accessory) that holds optical information of all other accessories among the accessories related to the correction. As a method of determining the first accessory, for example, the determination may be made based on the identification information acquired from the accessory, or the accessory may be inquired by communication. Details will be described later with reference to FIG.

When the first accessory is confirmed by S30700, the transition to S30800 occurs.

Upon transition to S30800, the camera control unit 205 transmits the identification information of other accessories related to the correction to the first accessory determined by S307, and requests the correction processing of the optical information of the interchangeable lens 1000. In this embodiment, as an example, when the first accessory is an interchangeable lens, communication is performed by the first communication. When the first accessory is an intermediate accessory, communication is performed by the second communication.

The control unit of the first accessory, which has received the correction request by S30800, performs the correction processing of the optical information of the interchangeable lens 1000 by using the optical information of the other accessories related to the correction held.

After transitioning to S30900, the camera control unit 20500 acquires the optical information corrected by the first accessory.

On the other hand, in S30600, the camera control unit 20500 determines that among the interchangeable lens and the intermediate accessory whose correction processing necessity information is "necessary" in S30500, the camera control unit 20500 does not have the optical information. In the case, the transition to S31000 occurs. In this case, the camera control unit 20500 holds the optical information of all the accessories.

Upon transition to S31000, the camera control unit 20500 corrects the optical information of the interchangeable lens by using the optical information of the interchangeable lens and the optical information of the intermediate accessory held by the camera control unit 20500.

Further, in S30500, when the camera control unit 20500 determines that there is no intermediate accessory that requires correction of the optical information of the interchangeable lens, the correction processing of all the intermediate accessories to which the intermediate accessory is not attached or is attached. The necessity information is "No". Therefore, as a process when it is not necessary to correct the optical information of the interchangeable lens, the process proceeds to S31100.

When the transition to S31100 occurs, it is determined whether or not the camera body 2000 holds the optical information of the interchangeable lens 1000 based on the identification information of the interchangeable lens 1000 included in the interchangeable lens authentication information acquired in S30300. If the camera control unit 20500 does not hold the optical information of the interchangeable lens, the process proceeds to S31200.

Upon transition to S31200, the camera control unit 20500 acquires the optical information of the interchangeable lens 1000 from the lens control unit 11300 in the first communication.

On the other hand, when it is determined that the S31100 holds the optical information of the interchangeable lens 1000, the camera control unit 20500 acquires the optical information from the data table in the camera in the S31300.

After acquiring the optical information by S30900, S31000, S31200, or S31300, the transition to S31400 is performed, and the optical information acquisition sequence ends.

After acquiring the optical information, the first communication path is used for communication for the camera body 2000 to control the interchangeable lens 1000, and the second communication path is that the camera body 2000 has the intermediate accessory operating member 31000 and the intermediate accessory operating member 41000. It is used for communication to constantly acquire the operation information of. The communication for constantly acquiring the operation information of the operation member 11600 of the interchangeable lens is the first communication path and the second communication path in consideration of the occupancy rate of each communication path and the immediacy required for communication and control. Any of the communication paths of is used.

<Initial communication processing by the first communication between the camera and the interchangeable lens (Fig. 14)>
FIG. 14 shows the flow of the subprocess S30300, which is the initial communication performed by the camera body 2000 with the interchangeable lens 1000 in the camera system of the fifth embodiment. In the initial communication, the camera control unit 20500 acquires the authentication information of the interchangeable lens 1000 from the lens control unit 11300.

When the subprocess is started in S40100, the transition to S40200 occurs.

Upon transition to S40200, the camera control unit 20500 transmits an interchangeable lens authentication information transmission request (corresponding to the first transmission request) to the lens control unit 11300 in the first communication.

Here, the interchangeable lens authentication information request of this embodiment will be described with reference to FIG. 19A. The interchangeable lens authentication information request of this embodiment is information that requires the interchangeable lens 1000 to transmit two pieces of authentication information to the camera control unit 20500. The authentication information request includes an identification information request for the interchangeable lens and an operating state information request.

When the lens control unit 11300 receives the interchangeable lens authentication information transmission request in S40300, the process transitions to S40400. Then, the lens control unit 11300 transmits the interchangeable lens authentication information (corresponding to the first information) to the camera control unit 20500 in the first communication.

Here, the authentication information transmitted by the interchangeable lens 1000 to the camera control unit 20500 will be described with reference to FIG. 19B. The authentication information includes identification information and operating state information.

When the camera control unit 20500 receives the interchangeable lens authentication information in S40500, the process proceeds to S40600 and the received interchangeable lens authentication information is stored.

With S40700, the subprocess S30300 ends.

<Initial communication processing by the second communication between the camera and the intermediate accessory (Fig. 15)>
FIG. 15 is a diagram illustrating a flow of a subprocess S30400, which is an initial communication process performed by the camera body 2000 and the accessory in the camera system of the fifth embodiment. In the initial communication, the camera control unit 20500 acquires the authentication information of the accessory. The authentication information of the accessory will be described later.

When the subprocess is started in S50100, the transition to S50200 occurs.

Upon transition to S50200, the camera control unit 20500 transmits an accessory authentication information request (corresponding to the second transmission request) to the intermediate accessory control unit 30900 in the second communication.

Here, the authentication information request of the accessory of this embodiment will be described with reference to FIG. 19 (c). The accessory authentication information request is information that the accessory requests the camera control unit 20500 to transmit the accessory authentication information. In this embodiment, the accessory authentication information includes accessory identification information, operating state information, correction processing necessity information, and termination information.

When the intermediate accessory control unit 30900 receives the accessory authentication information request in S50300, the transition to S50600 occurs.

In S50600, the intermediate accessory control unit 30900 transmits the authentication information of the intermediate accessory 3000 to the camera control unit 20500 in the second communication.

Here, the authentication information transmitted by the intermediate accessory to the camera control unit 20500 will be described with reference to FIG. 19D. The authentication information includes identification information (an example of the third information), operating state information, correction processing necessity information, and termination information.

The correction processing necessity information is information indicating "necessity" if the intermediate accessory changes the optical characteristics. If it does not change the optical characteristics, it is information indicating "No".

In this embodiment, the termination information is information indicating whether or not it is the termination of the second communication when viewed from the camera body 2000. If the intermediate adapter is the end of the second communication when viewed from the camera body 2000, the end information is information indicating that it is the end. If it is not the end of the second communication when viewed from the camera body 2000, the end information is information indicating that it is not the end.

In one-to-many communication such as the second communication, the destination can be specified by, for example, adding the identification information of the accessory to the beginning of the communication data. However, at the stage of S50200, since the camera control unit 20500 does not have any accessory information, it is not possible to specify the transmission destination by communication data.

Therefore, as an example of the means for the camera body 2000 to sequentially communicate with a plurality of accessories in this sub-process, there is a method of using the second communication connection switch 31100 and the second communication connection switch 41100 as follows. It is assumed that the second communication connection switch 31100 and the second communication connection switch 41100 are short-circuited in the steady state.

In S50100, the camera control unit 20500 transmits this subprocess start information in the second communication. Since the second communication connection switch 31100 and the second communication connection switch 41100 are short-circuited, each accessory receives the subprocess start information. Each intermediate accessory that receives this subprocess start information opens its own second communication connection switch. As a result, only the intermediate accessory control unit 30900 is connected to the camera control unit 20500, and the data transmitted by the camera control unit 20500 can be received. When the intermediate accessory control unit 30900 that has finished processing the received data short-circuits the second communication connection switch 31100, the intermediate accessory control unit 40900 can receive the data transmitted by the camera control unit 20500. The intermediate accessory 3000 in which the second communication connection switch is short-circuited does not respond to the transmission information of the camera control unit 20500 until the subprocess end information transmitted by the camera control unit 20500 is received in S52200 where the subprocess ends.

In this embodiment, even when the intermediate accessory 3000 is operating in the safe mode, the camera body 2000 and the intermediate accessory 3000 do not end this sub-process, and the accessories are connected via the intermediate accessory 3000. Initial communication with. However, if an accessory operating in safe mode is installed, it is not necessary to perform initial communication with the installed accessory via the accessory. For example, when the operating state of the intermediate accessory 3000 is in the safe mode, the intermediate accessory control unit 30900 does not short-circuit the second communication connection switch 31100 even when the processing for the received data is completed. Then, the subprocess may be terminated immediately by transmitting the authentication information to the camera control unit 20500 with the termination information as "termination".

By taking the same behavior of the intermediate accessory 4000, the camera control unit 20500 can sequentially communicate with a plurality of accessories.

Since the second communication connection switch 31100 is open in S50400 and S50500, the intermediate accessory 4000 and the lens control unit 11300 do not receive the information transmission request transmitted from the camera control unit 20500 in S50200.

In S50600, the intermediate accessory control unit 30900 transmits the authentication information of the intermediate accessory 3000 to the camera control unit 20500 in the second communication. Then, the second communication connection switch 31100 is short-circuited. As a result, the intermediate accessory control unit 40900 can receive the data transmitted by the camera control unit 20500.

When the camera control unit 20500 receives the authentication information of the intermediate accessory 3000 in S50700, the transition to S50800 occurs. Then, the received authentication information is stored.

As described above, when the authentication information of the intermediate accessory 3000 is acquired by S50200 to S50800, the transition to S50900 occurs. In S50900, S51100, S51300 to S51500, the camera control unit 20500 acquires the authentication information of the intermediate accessory 4000 in the same manner as in S50200, S50300, S50600 to S50800.

In S51000, the intermediate accessory control unit 30900 receives the authentication information request transmitted by the camera control unit 20500, but does not respond because it has not received the subprocess end information.

In S51200, as in S50400 and S50500, since the second communication connection switch 41100 is open, the lens control unit 11300 does not receive the information transmission request transmitted from the camera control unit 20500 in S50900.

Example 5 is an example in which a total of three accessories, one interchangeable lens and two intermediate accessories, are connected, but only one intermediate accessory may be connected, or three or more may be connected. Since any number of intermediate accessories may be attached, it is preferable that the accessory information acquisition process is completed by acquiring the accessory termination information.

The terminal information of the accessory may be obtained by another method. For example, as in the case of S50200 and S50900, when the camera control unit 20500 transmits an authentication information request on the assumption that an intermediate accessory is attached, the interchangeable lens is based on the termination information returned from the lens second communication unit 11500. You may be notified that there is. Further, the intermediate accessory 4000 may detect that it is the terminal due to the connection state of terminals (not shown) or the like, and notify the camera body 2000 by S51300. In this embodiment, a case where the end information is notified by the lens control unit 11300 returning the authentication information including the end information to the authentication information request from the camera control unit 20500 will be described.

In S51600, similarly to S50200 and S50900, the camera body 20 transmits an authentication information request (corresponding to the second transmission request) in the second communication. In S51700 and S51800, the intermediate accessory 3000 and the intermediate accessory 4000 do not respond because they have not received the subprocess end information like S51000.

When the lens control unit 11300 receives the authentication information request in S51900, it transitions to S52000 and transmits the authentication information to the camera control unit 20500 in the second communication.

Here, the authentication information transmitted by the lens control unit 113 to the camera control unit 20500 will be described with reference to FIG. 19 (e). The authentication information includes identification information (an example of the second information), operating state information, correction processing necessity information, and termination information.

Since the interchangeable lens 1000 is not an intermediate accessory, it is not necessary to correct the optical information of the interchangeable lens 1000 by mounting the interchangeable lens 1000. Therefore, the correction processing necessity information is information indicating that the correction processing is unnecessary.

Further, since the interchangeable lens 1000 of this embodiment is the end of the second communication when viewed from the camera body 2000, the end information is information indicating that the interchangeable lens 1000 is the end of the second communication.

When the camera control unit 20500 acquires the authentication information by S52100, the process proceeds to S52200 and a series of initial communication processes is completed.

In order to shorten the communication processing, it is preferable to acquire the correction processing necessity information as in this embodiment, but when the correction information necessity information is not exchanged, the correction processing is required for all the intermediate accessories. Judge that there is.

With S52200, the subprocess S30400 ends.

In this embodiment, in this embodiment, a process using a means for sequentially communicating with a plurality of accessories by using the second communication connection switch has been described. However, another means may be used as long as it can communicate with a plurality of accessories. For example, by detecting the voltage level of a terminal (not shown) to which the accessory is connected to itself, it is possible to grasp the number of the accessory attached from the camera body side. In that case, the number of information transmission requests transmitted from the camera is counted, and the information is transmitted to the camera body only when it matches the mounting order of the camera.

<Subprocess S30700 for determining the first accessory (FIG. 16)>
In the fifth embodiment, the flow of the sub-process S30700 in which the camera body 2000 searches for the first accessory among the accessories related to the correction by communication will be described with reference to FIG.

FIG. 16 shows the flow of the subprocess S30700 in which the camera control unit 20500 determines the first accessory among the accessories related to the optical correction in the camera system of the fifth embodiment. Here, it is assumed that the camera control unit 20500 does not hold the optical information of the interchangeable lens 1000, the intermediate accessory 3000, and the intermediate accessory 4000. Further, it is assumed that the correction processing necessity information of the intermediate accessory 3000 and the intermediate accessory 4000 is both "necessary".

When the subprocess is started in S60100, the process transitions to S60200.

Upon transition to S60200, the camera control unit 20500 transmits the 00 identification information of the intermediate accessory 40 and the optical information presence / absence reply request to the intermediate accessory control unit 30900 in the second communication, and retains the optical information of the intermediate accessory 4000. Ask if you have. The destination can be specified, for example, by adding the identification information of the intermediate accessory to the transmission data at the beginning of the communication data and the accessory referring to the value at the beginning of the communication data to determine whether the communication is addressed to itself. Good.

When the intermediate accessory control unit 30900 receives the identification information of the intermediate accessory 4000 and the optical information presence / absence reply request in S60300, the transition to S60400 occurs.

In S60400, the intermediate accessory control unit 30900 transmits to the camera control unit 20500 in the second communication whether or not the optical information of the intermediate accessory 4000 is held.

When the camera control unit 20500 receives the presence / absence of optical information of the intermediate accessory 4000 from the intermediate accessory 3000 in S60500, the transition to S60600 occurs.

In S60600, the camera control unit 20500 determines an intermediate accessory (also referred to as a first intermediate accessory) having optical information of the other intermediate accessory.

When the intermediate accessory control unit 30900 holds the optical information of the intermediate accessory 4000, the process proceeds to S60700, and the camera control unit 20500 determines that the intermediate accessory 3000 is the first intermediate accessory.

If the intermediate accessory control unit 30900 does not hold the optical information of the intermediate accessory 4000, the process proceeds to S60800, and the camera controls that the intermediate accessory 4000 is the first intermediate accessory and holds the optical information of the intermediate accessory 3000. Department 20500 determines.

Even when three or more intermediate accessories are attached, it is possible to determine the first intermediate accessory in the same manner. For example, when three accessories are attached, the same processing as S60200 to S60500 is performed between the two accessories. When the first intermediate accessory is found, the transition to S60900 is performed.

Upon transition to S60900, the camera control unit 20500 requests the lens control unit 11300 to respond to the presence / absence of identification information and optical information (fourth information) of the first intermediate accessory determined in S60700 or S60800 in the first communication. (Third instruction information) is transmitted. In other words, it asks if it holds the optical information of the first intermediate accessory.

When the lens control unit 11300 receives the identification information of the first intermediate accessory and the response request for the presence / absence of optical information in S61000, the process proceeds to S61100, and whether or not the optical information of the first intermediate accessory is retained is set in the first communication. Is transmitted to the camera control unit 20500.

When the camera control unit 20500 receives the presence or absence of the optical information of the first intermediate accessory from the interchangeable lens 1000 in S61200, the transition to S61300 occurs, and whether or not the lens control unit 11300 holds the optical information of the first intermediate accessory. To judge. This determines the first accessory.

When the camera control unit 20500 determines that the lens control unit 11300 holds the optical information of the first intermediate accessory, the process proceeds to S61400. In S61400, it is determined that the interchangeable lens 1000 is the first accessory and holds the optical information of the intermediate accessory 3000 and the intermediate accessory 4000. When the camera control unit 20500 determines that the lens control unit 11300 does not hold the optical information of the first intermediate accessory, the process proceeds to S61500.

In S61500, the camera control unit 20500 determines that the first intermediate accessory is the first accessory.

When the first accessory is confirmed by S61400 or S61500, the process proceeds to S61600, and the camera control unit 20500 stores the identification information of the first accessory and the accessory type. When the first accessory is stored, the transition to S61700 and the subprocess S30700 are terminated.

<Effect of Example 5>
As described above, in the fifth embodiment, the first communication path through which the camera and the interchangeable lens can communicate and the second communication path through which the camera and the accessory can communicate are independently provided. Then, the unit for correcting the optical information of the interchangeable lens is determined based on the identification information of each unit and the information on the necessity of intermediate accessory correction processing acquired by communication using each communication path. As a result, communication can be performed between the image pickup apparatus, the interchangeable lens, and the intermediate accessory units at a more intended timing while appropriately correcting the optical information of the interchangeable lens.

In Example 5, a method of correcting the optical information of the interchangeable lens based on the optical information of the intermediate accessory in the activation sequence immediately after mounting the interchangeable lens has been described. In the sixth embodiment, a method of correcting the optical information of the interchangeable lens when the optical system of the accessory is dynamically changed by operating the operating member provided on the accessory will be described.

Examples of dynamically changing the optical system of the accessory by operating the operating member provided on the intermediate accessory include a variable magnification lens having a variable magnification and an ND filter having a variable transmittance.

In the sixth embodiment, when the interchangeable lens is attached and the current optical system is determined, the process described in the fifth embodiment is executed. As a result, it is assumed that the camera control unit 20500 grasps the unit that holds the optical information of all the accessories among the interchangeable lens 1000, the camera body 2000, the intermediate accessory 3000, and the intermediate accessory 4000.

Further, it is assumed that the camera control unit 20500 recognizes the accessory whose optical system can be dynamically changed based on the accessory identification information acquired by the operation as in the fifth embodiment.

Hereinafter, an accessory whose optical information changes dynamically and whose correction processing necessity information is “necessary” is referred to as a dynamic accessory. An intermediate accessory whose optical information does not change dynamically and whose correction processing necessity information is "No" is called a static intermediate accessory. An interchangeable lens whose optical information changes dynamically is called a dynamic lens, and an interchangeable lens whose optical information does not change dynamically is called a static lens.

In this embodiment, an example in which the intermediate accessory 3000 and the intermediate accessory 4000 are mounted between the camera body 2000 and the interchangeable lens 1000 will be described, but only one of the intermediate accessories is mounted. Even if there is, this embodiment is applicable.

<Dynamic accessory search process (Fig. 17)>
FIG. 17 shows the relationship between Example 5 and this example. When the camera system is started in S70100, the transition to S70200 occurs.

In S70200, the camera control unit 20500 executes the process described with reference to FIG. That is, for example, initial communication, determination of the first unit, and correction of optical information of the interchangeable lens are executed. In the initial communication, information (also referred to as dynamic accessory information) corresponding to whether or not the optical system changes dynamically is acquired from the interchangeable lens 1000, the intermediate accessory 3000, and 4000. For example, the camera control unit 20500 transmits a transmission request to the accessory at the timing of acquiring the identification information in S40200 of FIG. 14 and S50200 and S50900 of FIG. 15 for information on whether or not the optical system changes dynamically. The accessory transmits dynamic accessory information in response to the transmission request. The authentication information may be included in the dynamic accessory information, and the camera control unit 20500 may acquire the authentication information including the moving body accessory information as a response to the transmission request of the authentication information transmitted to the accessory. The camera control unit 20500 may determine whether or not the dynamic accessory information is a dynamic accessory from the accessory identification information acquired in S70200 without separately acquiring the dynamic accessory information. In this case, the memory (not shown) of the camera control unit 20500 may be configured to have information (table or the like) indicating the correspondence between the accessory identification information and whether or not the optical system changes dynamically. As a result, the camera control unit 20500 can determine whether or not the accessory is a dynamic accessory based on the identification information of the accessory.

When the subprocess S70200 is completed, the process transitions to S70300.

In S70300, the camera control unit 20500 determines whether or not the dynamic accessory is attached based on the above-mentioned dynamic accessory information. More specifically, when information indicating that the optical system changes dynamically is acquired from any of the accessories as dynamic accessory information, the camera control unit 20500 determines that the dynamic accessory is attached. To do. Further, when the information indicating that the optical system changes dynamically is not acquired as the dynamic accessory information, the camera control unit 20500 determines that the dynamic accessory is not attached. If a dynamic accessory is installed, the transition to S70400 is performed.

In S704, 00, the camera control unit 20500 executes a sub-process of correcting the optical information of the interchangeable lens based on the change in the optical information of the dynamic accessory. If the dynamic accessory is not attached or the dynamic accessory is not operated, it is not necessary to correct the optical information of the interchangeable lens. Therefore, the process proceeds to S70500, and the optical correction process of the interchangeable lens ends.

<Correction processing of optical information according to the operation of dynamic accessories (Fig. 18)>
Hereinafter, with reference to FIG. 18, a subprocess S70400 that corrects the optical information of the interchangeable lens based on the change of the optical information according to the operation of the dynamic accessory according to the sixth embodiment of the present invention will be described.

In the subprocess shown in FIG. 18, the intermediate accessory 3000 is a dynamic accessory, the interchangeable lens 1000 is a first unit and a static lens, and the intermediate accessory 4000 is a static intermediate accessory. That is, it is assumed that the camera control unit 20500 and the lens control unit 11300 recognize such in S70200 of FIG.

When the sequence starts in S80100, the transition to S80200 occurs.

In S80200, the camera control unit 20500 transmits an optical data identification information transmission request to the intermediate accessory control unit 30900 of the intermediate accessory 3000, which is a dynamic accessory, in the second communication.

When the intermediate accessory control unit 30900 receives the optical data identification information transmission request in S80300, it transitions to S80400 and transmits the optical data identification information to the camera control unit 20500 in the second communication.

The optical data identification information of the dynamic accessory is information related to the correction parameter of the optical information of the interchangeable lens 1000, and in this embodiment, for example, it is the current optical information. For example, if the intermediate accessory has a variable magnification lens, it is the current magnification information. Further, for example, when the intermediate accessory has an ND filter, it is information for correcting the current optical path length. The optical data identification information may be other information as long as the first unit can recognize the optical state of the dynamic accessory. In addition, information such as the model number (ID) used for identifying the type (model) may be provided with information on a plurality of possible states, or optical data identification information indicating dynamically changing optical data. It may be. In addition, it may include information indicating the function of the accessory and information such as a manufacturing number (serial number) that can identify an individual in the same model.

When the camera control unit 20500 receives the optical data identification information in S80500, the transition to S80600 occurs.

In S80600, the camera control unit 20500 determines whether the optical information of the intermediate accessory 3000 has changed based on the optical data identification information. For example, the optical information of the intermediate accessory 3000 received in the initial communication of S70200 is compared with the optical data identification information received in S80500. If the optical information has not changed, the process returns to S80200, and the camera control unit 20500 retransmits the optical data identification information transmission request after a lapse of a predetermined time.

When the camera control unit 20500 determines that the optical information of the intermediate accessory 3000 has changed in S80600, the process proceeds to S80700 and the process proceeds to correct the optical information of the optical lens.

As a means for the camera control unit 20500 to recognize the change in the optical information of the dynamic accessory, as in S80200, 80300, 80400, 80500, and S80600, the optical is obtained by communicating with the dynamic accessory at regular intervals by polling. You may receive the presence or absence of changes in the information.

Further, an interrupt signal may be received from the dynamic accessory when the optical information of the dynamic accessory changes. For example, assume that the intermediate accessory 3000, which is a dynamic accessory, has an operating member that changes the optical information of the intermediate accessory 3000. In this case, it is possible to detect that the operating member has been operated and transmit an interrupt signal from the intermediate accessory control unit 30900 described later to the camera control unit 20500. Further, even if the camera control unit 20500 receives an interrupt signal from the intermediate accessory control unit 309 and determines that the optical data identification information has changed in S80600, the above-mentioned S80200, S80300, S80400, and S80500 are executed. good.

Further, optical data identification information reflecting the change may be exchanged, such as S80200, S80300, S80400, and S80500. Further, only the change of the optical data identification information may be notified to the camera control unit 20500, and the camera control unit 20500 may calculate the current optical data identification information and start the exchange.

Upon transition to S80700, the camera control unit 20500 requests correction of the optical data identification information of the intermediate accessory 3000 and the optical information of the interchangeable lens 1000 (also referred to as an optical correction request) by the first communication of the interchangeable lens, which is the first unit. It is transmitted to 1000 lens control units 11300.

In S80800, when the lens control unit 11300 receives the optical data identification information and the optical correction request of the intermediate accessory 3000, the lens control unit 11300 transitions to S80900.

In S80900, the lens control unit 11300 acquires the current optical information of the intermediate accessory 3000 from the table in the lens control unit 11300 based on the optical data identification information of the intermediate accessory 3000, and transitions to S80900.

In S81000, the optical information of the interchangeable lens 1000 is corrected based on the optical information of the intermediate accessory 4000, which is a static intermediate accessory acquired in the subprocess S70200, and the optical information of the intermediate accessory 3000.

When the correction is completed, in S81100, the lens control unit 11300 transmits the corrected optical information of the interchangeable lens 1000 to the camera control unit 20500 by the first communication.

When the camera control unit 20500 receives the corrected optical information of the interchangeable lens in S81200, the process proceeds to S81300 and the optical information is stored in the camera control unit 20500.

When S81300 ends, it returns to S80200 and monitors the change in the optical information of the dynamic accessory again.

In this embodiment, a case where one of the intermediate accessories is a dynamic accessory and the optical lens 1000 is the first unit has been described. In addition, even if there are a plurality of dynamic accessories or the first unit is a unit other than the interchangeable lens, the correction process can be performed in the same manner.

Further, when only the first unit is a dynamic accessory, if the first unit recognizes that, optical correction is performed at the stage when it recognizes that its own optical information has changed, and optical correction is performed. The optical data of the later interchangeable lens 1000 may be transmitted to the camera body 2000.

The correction processing of the optical information of the interchangeable lens 1000 is performed in consideration of not only the optical information of the dynamic accessory acquired in S80500 but also the optical information of the static intermediate accessory such as the optical information of the intermediate accessory 4000 of S81000. .. If a static intermediate accessory is attached, it is corrected in advance by the optical information of the static intermediate accessory, and when the optical information changes dynamically, the final correction process is performed by the optical information of the dynamic accessory. You may.

<Effect of Example 6>
As described above, in the sixth embodiment, the camera control unit 20500 detects a change in the optical information of the intermediate accessory 3000. Then, the camera body 2000 transmits the information regarding the change in the optical information and the correction request for the optical information of the interchangeable lens 1000 to the lens control unit 11300. Then, the lens control unit 11300 corrects the optical information of the interchangeable lens 1000 and transmits it to the camera control unit 20500.

As a result, even when the optical information of the accessory changes dynamically, the optical information of the interchangeable lens can be appropriately corrected.

In this embodiment, the case where the optical data identification information indicating the optical data peculiar to the accessory is used as the intermediate accessory identification information will be described.

Product-specific information such as the model number (ID) of the intermediate accessory identification information is an accessory that can be corrected when the new product accessory has the same optical system as the known accessory or by the same correction method as the known accessory. However, a new model number will be assigned. Therefore, when the necessity of correction of the optical information of the interchangeable lens is judged by the model number (ID) or the like, if the model number (ID) is unknown, the optical characteristics of the accessory are taken into consideration when the lens is optical. The information could not be corrected.

Therefore, in this embodiment, the optical data identification information is used as the intermediate accessory identification information. In this embodiment, the intermediate accessory identification information is associated with the correction method. More specifically, the optical data identification information is a combination of information on the correction method and information on the correction parameters. Such optical data identification information is hereinafter referred to as correction identification information. The information regarding the correction method of this embodiment is the information corresponding to the optical member of the intermediate accessory, and the information regarding the correction parameter is the information corresponding to the optical information of the intermediate accessory due to the optical characteristics of the optical member. Taking the case where the intermediate accessory is a variable magnification adapter having a variable magnification lens as an example, the information regarding the correction method is the information indicating the variable magnification lens, and the information regarding the correction parameters is the magnification information of the variable magnification lens.

The lens control unit 11300 may be configured to store information on the correction method and information on the correction parameters in association with each other. If other information is required for the correction of the optical information, the information may be stored in association with the information on the correction method and the information on the correction parameters.

In this way, the information regarding the correction method and the information regarding the correction parameters are transmitted to the lens control unit 11300 via the camera control unit 20500. As a result, even if a correction is required in consideration of an intermediate accessory having different information on the correction parameters, the existing unit (interchangeable lens 1000 in this embodiment) can be set by resetting the magnification information which is the correction parameter. Can be corrected by.

In this way, by using the optical data identification information, it is possible to correct the optical information of the interchangeable lens in consideration of the optical characteristics of the accessory. For example, if the accessory has the same optical system as the existing product, or if the accessory can be corrected in the same way as the existing product, even if the model number (ID) is unknown, the optical of the interchangeable lens The information can be corrected.

When the correction identification information is used, it is not efficient to store the correction algorithm in each unit, so it is preferable to determine in advance the unit to perform the correction. In this embodiment, a case where the unit for performing correction is determined in advance as an interchangeable lens will be described. Moreover, the correction method of the interchangeable lens when the correction identification information is used will be described. Similarly, the correction identification information can be used when the correction is performed by the first unit as in Examples 5 and 6.

<Acquisition processing of corrected optical information in Example 7 (FIG. 20)>
In FIG. 20, when power is supplied for the first time after each accessory is attached, the camera body 2000 acquires correction information from each accessory and transmits the correction information to the interchangeable lens 1000 to request correction, and the corrected interchangeable lens. The flow of the process of acquiring 1000 optical information is shown.

When the camera body 2000 is started in S100100, the transition to S100200 occurs.

Upon transition to S100200, the camera body 2000 supplies power to the interchangeable lens 1000, the intermediate accessory 3000, and the intermediate accessory 4000 via a power supply mount contact (not shown), and transitions to S100300.

The subprocess S100300, which is the initial communication process with the accessory by the second communication, is substantially the same as the subprocess S30400 in the fifth embodiment. In S100300, the above-mentioned correction identification information is acquired as the identification information of the intermediate accessory.

When the correction authentication information of the accessory is acquired by S100300, the transition to S100400 occurs.

Upon transition to S100400, the camera control unit 20500 transmits the intermediate accessory correction identification information acquired in S100300 to the interchangeable lens 1000, and requests correction of the optical information. When the interchangeable lens acquires the correction identification information of the intermediate accessory, the process transitions to S100500.

Upon transition to S100500, the interchangeable lens control unit 11300 determines whether it is necessary to correct its own optical information based on the intermediate accessory correction identification information. If an intermediate accessory that requires correction of optical information is attached, the transition to S100600 is performed.

Upon transition to S100600, the interchangeable lens control unit 11300 corrects its own optical information based on the intermediate accessory correction identification information, and transmits the corrected optical information to the camera.

Further, in S100500, if the intermediate accessory is not attached or all the intermediate accessories attached are intermediate accessories that do not require correction of the optical information of the interchangeable lens, correction processing is not required, so that S100700 Transition to.

In S100700, the interchangeable lens control unit 11300 transmits its own optical information to the camera.

The transmission timing of the optical information in S100600 and S100700 may be immediately after the correction is completed, or may be the timing requested by the camera.

After acquiring the optical information by S100600 or S100700, the transition to S100800 is performed, and the optical information acquisition sequence is completed.

In this way, in a camera system having an independent first communication path through which the camera and the interchangeable lens can communicate and a second communication path through which the camera and the intermediate accessory can communicate, the interchange is based on the optical information of the intermediate accessory. The optical information of the lens can be corrected appropriately.

Further, in the fifth embodiment, an example is shown in which the accessory authentication information includes the accessory identification information and the correction processing necessity information. On the other hand, even if the authentication information of the accessory has only the correction processing necessity information and the correction processing necessity information indicates the correction "necessity", the correction processing necessity information is separately acquired. good. As a result, it is possible to reduce the amount of communication when the correction processing necessity information indicates correction "no" as compared with the case where the correction identification information is acquired regardless of the necessity of the correction processing necessity information. is there. In this case, as in the above-described embodiment, both the intermediate accessory identification information and the correction processing necessity information are acquired. That is, when the correction processing necessity information is the correction "necessary" and the correction identification information is acquired separately, both the intermediate accessory identification information and the correction identification information are acquired as the information for identifying the accessory. As a result, the amount of communication when the correction processing necessity information indicates correction "No" is reduced, and the intermediate accessory is used regardless of whether the correction processing necessity information is correction "Necessary" or "No". The identification information can be used for other purposes.

Further, when it is determined that the lens control unit 11300 does not store the information corresponding to the information regarding the correction method based on the information regarding the correction method including the correction identification information, the optical information of the interchangeable lens 1000 is obtained. It may be controlled so that the correction is not performed.

<Effect of Example 7>
As described above, the camera control unit 20500 acquires the information regarding the correction method and the information regarding the correction parameters from the intermediate accessory control unit 30900, and transmits these information to the lens control unit 11300. As a result, the lens control unit 11300 can correct the optical information in consideration of the accessory if the correction method is known even for a new accessory.

In the above embodiment, the camera body 2000 acquires the identification information of the interchangeable lens 1000 (also referred to as the first lens identification information) as the authentication information of the interchangeable lens 1000 in the initial communication performed with the interchangeable lens 1000 in the first communication. I explained that. Further, it has been explained that the camera body 2000 acquires the identification information of the interchangeable lens 1000 (also referred to as the second lens identification information) as the authentication information of the interchangeable lens 1000 in the initial communication performed with the accessory in the second communication. In this embodiment, an embodiment focusing on the relationship between the first lens identification information and the second lens identification information will be described.

As described above, the identification information of the interchangeable lens 1000 and the accessory may be information such as a model number (ID) used for identifying the type (model) of the corresponding unit. In addition, it may include information indicating the function of the interchangeable lens and information such as a manufacturing number (serial number) that can identify an individual in the same model.

Here, in the camera system of the present embodiment, the interchangeable lens 1000 can communicate with the camera body 2000 by both the first communication and the second communication, and as described in the fifth embodiment, the first communication and the second communication are possible. Initial communication is performed with the camera body 2000 by both of the two communications. The interchangeable lens 1000 transmits the identification information of the interchangeable lens 1000 (the above-mentioned first lens identification information and the second lens identification information) to the camera body 2000 in both the initial communication of the first communication and the second communication. ..

At this time, the lens control unit 11300 may send the same information as the first lens identification information and the second lens identification information, but in this embodiment, the first lens identification information is intentionally used as the second lens identification information. Information different from the information is transmitted to the camera control unit 20500. As a result, the lens control unit 11300 effectively utilizes the second lens identification information transmitted to the camera control unit 20500 by the second communication.

The first lens identification information and the second lens identification information of this embodiment will be described more specifically. The first lens identification information is information that enables identification of the type (model) of the interchangeable lens 1000, and is assumed to be a model number (ID) as an example.

On the other hand, the second lens identification information is information different from the first lens identification information, and as an example, it is information indicating that the interchangeable lens 1000 is a lens. In this case, the second lens identification information is information indicating that the interchangeable lens 1000 is a lens, and is not compatible with the type (model) of the interchangeable lens 10. From this, for example, the second lens identification information can be unique information regardless of the type (model) of the interchangeable lens 1000.

As described above, in this embodiment, the first identification information transmitted by the lens control unit 11300 in the initial communication of the first communication, which is one-to-one communication between the camera body 2000 and the interchangeable lens 1000, is transmitted to the camera body 2000. It is not transmitted in the second communication assuming one-to-many communication with each accessory. In the second communication, as the second identification information, information indicating that the lens is used, in other words, information indicating that the accessory is not an intermediate accessory is transmitted to the camera control unit 10500.

By properly using the first lens identification information and the second lens identification information as described above in this embodiment, for example, the effects described below can be realized.

For example, the identification information acquired by the camera control unit 20500 from the lens control unit 11300 in the first communication is used as a system for the interchangeable lens, and the identification information acquired by the camera control unit 20500 from the control unit of each accessory in the second communication is intermediate. It can be treated as a system for accessories. This makes it possible to create a camera system that is expandable for intermediate accessories that may appear in the future.

It can also be used, for example, to determine the number of intermediate accessory connections. This is because the accessory that transmits identification information other than the second identification information to the camera control unit 10500 is not the interchangeable lens 1000, so it can be determined that it is an intermediate accessory.

When the number of intermediate accessories connected is known, for example, if a predetermined number or more of intermediate accessories are installed, a warning operation may be performed to the user, or the function of one of the intermediate accessories may be restricted. May be good. This makes it possible to reduce power consumption and maintain communication quality. When sending a large amount of data such as firmware upgrade to the intermediate accessory, it may be allowed to transition to the firmware upgrade mode of the intermediate accessory only when it is determined that only one intermediate accessory is connected. ..

Further, by determining that the interchangeable lens 1000 is not an intermediate accessory but a lens, it is possible to reduce the information to be transmitted from the lens control unit 11300 to the camera control unit 10500 in the initial communication of the second communication. .. For example, the lens control unit 11300 may not respond to the camera control unit 10500 with the correction processing necessity information. This is because it is not necessary to correct the optical information of the interchangeable lens 1000 by mounting the interchangeable lens 1000 which is not an intermediate accessory.

Further, for example, it may be used to electrically discriminate whether the terminal accessory is an interchangeable lens or an intermediate accessory and compare the discriminant result with the second identification information. It will be described in more detail below. As described above, the communication error can be determined by checking the consistency with the hardware processing.

In this embodiment, an example will be described of a method of electrically determining whether the terminal accessory is an interchangeable lens or an intermediate accessory in the initial communication with the interchangeable lens or the intermediate accessory in Examples 5 to 7. To do. Further, an error processing will be described when the determination result is inconsistent with the accessory corresponding to the end of the second communication determined by the identification information acquired by the second communication.

<Configuration of camera system in Example 8 (FIGS. 23 and 24)>
An example of a method of electrically determining whether the terminal accessory is an interchangeable lens or an intermediate accessory will be described below. The determination shall be made in the initial communication of the second communication.

First, a configuration when the interchangeable lens 1000 is attached to the end of the second communication will be described. As shown in FIG. 23, the mount 20100 of the camera body 2000 includes an identification terminal 21200. Further, the mount 30200 of the intermediate accessory 3000 includes the identification terminal 31300, and the mount 30200 includes the identification field factor 31300. Further, the mount 40200 of the intermediate accessory 4000 includes the identification terminal 41300, and the mount 40100 includes the identification terminal 41200. Further, the mount 10100 of the interchangeable lens 1000 includes an identification terminal. A line (also referred to as an identification line) connected via these identification terminals is connected to a resistor 11800 provided on the interchangeable lens 1000. Further, this line is pull-up connected through a resistor 21300 provided in the camera body 2000. The value obtained by dividing the voltage level of the pull-up power supply by each resistance value of the resistor 11800 and the resistor 21300 is input to the camera control unit 20500.

Next, the configuration when the end of the second communication is the intermediate accessory 4000 will be described. As shown in FIG. 24, as in the case where the end of the second communication is an interchangeable lens, the identification line via the identification terminals 21200, 31300, 31200, 41300 is connected to the resistor 41400 provided in the intermediate accessory 4000. ing. The input to the camera control unit 20500 is a value obtained by dividing the voltage level of the pull-up power supply of the camera body 2000 by each resistance value of the resistor 41400 and the resistor 21300.

<Second communication error determination method in Example 8 (FIG. 25)>
Here, the resistance value of the resistor used for the interchangeable lens 1000 and the resistance value of the resistor used for the intermediate accessory at the end are defined in advance so as to be different values. This makes it possible to electrically determine whether or not the accessory at the end is an interchangeable lens from the level of the input signal via the identification terminal.

When the electrically determined terminal accessory is the interchangeable lens 1000, the second identification information should be obtained as the identification information of the terminal accessory acquired in the initial communication by the second communication. On the other hand, when the electrically determined terminal accessory is an intermediate accessory, the identification information of the terminal accessory acquired in the initial communication by the second communication should be different from the second identification information. Specifically, it should be intermediate accessory identification information.

However, if there is any problem in the second communication, there may be a discrepancy in the above-mentioned correspondence. Therefore, if there is a discrepancy between the electrically determined terminal accessory and the identification information acquired by the second communication, it is determined that a communication error has occurred, and a retry is performed from the initial communication to perform more accurate communication. be able to.

In this way, by collating the electrical identification information with the identification information acquired by the second communication, it is possible to confirm whether or not the communication is correctly performed in the second communication. It is possible to determine whether the acquired identification information is correct. This makes it possible to detect a communication error in the second communication.

<Effect of Example 8>
As described above, in the present embodiment, the information indicating that the second lens identification information is different from the first lens identification information corresponding to the type (model) of the interchangeable lens 1000 and is a lens. And. Thereby, for example, it is possible to further improve the identification performance of the accessory that communicates by the second communication.

<Other Examples>
In the above-described embodiment, the first accessory has been described as an accessory that holds the optical information of all the other accessories among the accessories related to the correction. However, it may be an accessory that has the most optical information of each other among the accessories related to the correction. That is, there may be accessories that do not have optical information. In that case, in this case, the missing optical information may be acquired from another unit.

Further, in the initial communication of the above-described embodiment, the lens control unit 11300 transmits the identification information of the interchangeable lens 1000 in S40400 and S52000. Here, for example, the identification information transmitted in S52000 may be identification information indicating that the accessory is not an intermediate accessory.

Further, in the initial communication of FIG. 15 of the above-described embodiment, each accessory transmits a plurality of information as authentication information to the camera control unit 20500, but only necessary information may be transmitted. In this case, the camera identifies the required information and sends an information request to each accessory.

Further, in the above-described embodiment, the case where there are two intermediate accessories has been described, but in the case of three or more, whether the plurality of intermediate accessories have all the optical information of the other intermediate accessories. It is assumed that the one having more is the first intermediate accessory.

In the sixth embodiment, the dynamic accessory may correct the optical information of the interchangeable lens 1000. In this case, the dynamic accessory may acquire the optical information of the other accessory in advance. When the dynamic accessory corrects the optical information of the interchangeable lens 1000, the corrected optical information is transmitted to the camera body 2000.

In the sixth embodiment, when there are a plurality of first accessories, the dynamic accessory may correct the optical information of the interchangeable lens 1000.

In the seventh embodiment, the case where the optical information of the optical lens 1000 is corrected in the camera body 2000 has been described. On the other hand, the interchangeable lens 1000 may correct the optical information. In this case, the camera control unit 20500 transmits a request to the lens control unit 11300 to correct the optical information of the interchangeable lens 1000. At that time, if the interchangeable lens 1000 lacks the optical information of the intermediate accessory that needs to be corrected, the interchangeable lens 1000 may acquire the optical information of the intermediate accessory from the camera body 2000 or the intermediate accessory as necessary. ..

In the eighth embodiment, the camera control unit 20500 acquires the information on the correction method and the information on the correction parameters from the intermediate accessory control unit 30900, and transmits the information to the lens control unit 11300. Here, when the intermediate accessory 3000 is a dynamic intermediate accessory as described in the sixth embodiment and the information regarding the correction parameter may change, the information regarding the correction parameter is reacquired according to the detection of the change. You may. That is, when it is detected that the operating member of the intermediate accessory 3000 has been operated, the camera control unit 20500 acquires information on the correction parameters from the intermediate accessory control unit 30900, and transmits this information to the lens control unit 11300. You may try to do it.

Further, in the fifth embodiment, the case where the clock synchronous communication is performed as the first communication method has been described, but the pace synchronous communication may be performed. Synchronous pace communication will be described with reference to FIG.

Note that FIG. 12 illustrates a case where 3-wire clock synchronous communication is performed. Instead of this, the same effect can be realized even when the three-wire synchronous communication type communication, which is also realized by using the three wires of the communication channel 1, is adopted. FIG. 22 shows a signal waveform in the communication of the three-line pace synchronous communication. In the case of 3-wire paced synchronous communication, the RTS communication line (RTS) is provided in place of the clock communication line (LCLK) described above. The RTS communication line is a signal line for transmitting a signal for controlling the timing of communication by the camera-lens communication line (DCL) and communication by the first lens-camera communication line (DLC) from the camera microcomputer 20500 to the lens microcomputer 11100. Is. For example, it is used for notification of a lens data transmission request (transmission instruction) from the camera microcomputer 20500 to the lens microcomputer 11100, a communication processing switching request (switching instruction) described later, and the like. Notification on the transmission request channel is performed by switching the signal level (voltage level) on the transmission request channel between High (first level) and Low (second level). In the following description, the signal supplied to the RTS communication line is referred to as a transmission request signal RTS. The transmission request signal RTS is transmitted from the camera microcomputer 20500 as the communication master to the lens microcomputer 11100 as the communication slave. When the lens microcomputer 11100 receives the transmission request RTS, as shown in FIG. 22, in order to notify the camera microcomputer 20500 of the start of transmission of one frame of the lens data signal DLC, the signal level of the lens data signal DLC is set to Low for a 1-bit period. And. This 1-bit period is called a start bit ST indicating the start of one frame. That is, the data frame is started from this start bit ST. The start bit ST is provided in the first bit of each frame of the lens data signal DLC. Subsequently, the lens microcomputer 111 transmits 1-byte lens data in an 8-bit period from the next 2nd bit to the 9th bit. The data bit array is the MSB first format, starting with the most significant data D7, followed by data D6, data D5, and ending with the lowest data D0. Then, the lens microcomputer 11100 adds a 1-bit parity information PA to the 10th bit, and sets the signal level of the lens data signal DLC during the period of the stop bit SP indicating the end of one frame to High. As a result, the data frame period started from the start bit ST ends.

In addition, each of the above-mentioned Examples may be combined appropriately.

The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device read and execute the program. But it can be realized. Further, it can be realized by a circuit (for example, ASIC) that realizes one or more functions.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

10 Interchangeable lens 20 Camera body 30, 40 Intermediate adapter 113 Lens control unit 205 Camera control unit 309, 409 Adapter control unit

Claims (28)

An imaging device that can be equipped with multiple accessory devices.
A camera communication unit that provides a communication path between the plurality of accessory devices,
It has a camera control unit that communicates with the plurality of accessory devices via the camera communication unit.
The camera control unit
A first request is sent to the plurality of accessory devices,
From each of the plurality of accessory devices that have received the first request, first information corresponding to whether or not to stop communication with the image pickup device is received, and the first information is received.
An imaging device characterized in that communication with the plurality of accessory devices is controlled according to the first information. The camera control unit
From the received first information, the accessory device to be communicated is determined from the plurality of accessory devices.
The imaging device according to claim 1, wherein communication is performed with the accessory device determined to be a communication target. The camera control unit
The first information is retained until the power supply to the accessory device is stopped.
The imaging device according to claim 1 or 2, wherein the first information is initialized when the power supply is stopped. A claim, wherein the camera control unit receives authentication information including the first information and identification information of the accessory device from each of the plurality of accessory devices that have received the first request. The imaging device according to any one of 1 to 3. The camera control unit is characterized by receiving the authentication information from each of the plurality of accessory devices in the initial communication performed in response to the power being supplied from the imaging device to the plurality of accessory devices. The imaging device according to claim 4. The imaging according to claim 4 or 5, wherein the authentication information transmitted from the accessory device, which is the termination of the second communication with the imaging device, includes termination information indicating the termination. apparatus. The camera control unit
It is possible to perform the first communication with one of the plurality of accessory devices and to perform the second communication with the plurality of accessory devices.
The imaging device according to any one of claims 4 to 6, wherein the authentication information is received by the second communication. The camera control unit
Upon receiving the communication request and the second information corresponding to the factor of the communication request from the accessory device,
The imaging device according to any one of claims 1 to 7, wherein the imaging device or the accessory device is controlled according to the second information. When the factor is a change in the first information, the camera control unit transmits the first request to the plurality of accessory devices as control according to the second information. The imaging device according to claim 8, wherein the first information is re-received from the accessory device that has transmitted the second information. The camera control unit
In response to receiving a request from the accessory device to destroy the first information, the received first information is destroyed.
The imaging device according to any one of claims 1 to 9, wherein the first information is re-received from the accessory device. An accessory device that is attached to an imaging device that can be attached to multiple accessory devices.
An accessory communication unit that provides a communication path between the image pickup device and the image pickup device.
It has an accessory control unit that communicates with the image pickup device via the accessory communication unit.
The accessory control unit
An accessory device characterized in that, in response to receiving a first request from the image pickup device, first information corresponding to whether or not to stop communication with the image pickup device is transmitted to the image pickup device. The accessory according to claim 11, wherein the accessory control unit communicates with the image pickup device in response to the image pickup device determining the accessory device as a communication target from the first information. apparatus. 11. The accessory control unit is characterized in that after transmitting the first information to the image pickup device, communication with the image pickup device is stopped until the supply of power to the accessory device is stopped. Or the accessory device according to 12. The 11th to 13th claims, wherein the accessory control unit transmits authentication information including the first information and identification information of the accessory device to the imaging device in response to the first request. The accessory device according to any one item. 14. The accessory control unit according to claim 14, wherein the accessory control unit transmits the authentication information to the image pickup device in the initial communication performed in response to the power being supplied from the image pickup device to the accessory device. The accessory device described. When the accessory device is the end of the second communication with the imaging device,
The accessory device according to claim 14 or 15, wherein the authentication information includes terminal information indicating that the terminal is the terminal. The imaging device can perform a first communication with one of the plurality of accessory devices, and can perform a second communication with the plurality of accessory devices. ,
The accessory device according to any one of claims 14 to 16, wherein the accessory control unit transmits the authentication information to the image pickup device by the second communication. The accessory device according to any one of claims 11 to 17, wherein the accessory control unit transmits a communication request and a second information corresponding to the factor of the communication request to the image pickup device. .. When the factor is a change in the first information, the accessory control unit receives the first request in response to the second information from the imaging device, and obtains the first information. The accessory device according to claim 18, wherein the accessory device is retransmitted to the image pickup device. The accessory control unit
The accessory device according to any one of claims 11 to 19, wherein a request for discarding the first information is transmitted to the imaging device, and new new information is retransmitted. The accessory device according to any one of claims 11 to 20, wherein the accessory control unit shifts to a sleep state when communication with the image pickup device is stopped. The accessory device has a switch capable of switching between a connection state for connecting communication between the image pickup device and the plurality of accessory devices and a disconnection state for disconnecting the communication.
The accessory control unit is characterized in that, in response to receiving the first request with the switch in the connected state, the switch is switched to the disconnected state and the first information is transmitted to the imaging device. The accessory device according to any one of claims 11 to 21. 22. The accessory device according to claim 22, wherein the accessory control unit switches the switch to the connected state after transmitting the first information. An imaging system including an imaging device and a plurality of accessory devices mounted on the imaging device.
The image pickup device
A camera communication unit that provides a communication path between the plurality of accessory devices,
It has a camera control unit that communicates with the plurality of accessory devices via the camera communication unit.
The camera control unit transmits a first request to the plurality of accessory devices.
In response to receiving the first request, each of the plurality of accessory devices transmits first information corresponding to whether or not to stop communication with the image pickup device to the image pickup device.
The camera control unit is an imaging system characterized in that it controls communication with the plurality of accessory devices according to the first information. It is a communication control method for an imaging device that can be equipped with multiple accessory devices.
The step of transmitting the first request to the plurality of accessory devices, and
A step of receiving first information corresponding to whether or not to stop communication with the imaging device from each of the plurality of accessory devices that have received the first request.
A communication control method for an imaging device, which comprises a step of controlling communication with the plurality of accessory devices according to the first information. It is a communication control method of an accessory device mounted on an imaging device capable of mounting a plurality of accessory devices.
The step of receiving the first request from the image pickup apparatus and
A communication control method for an accessory device, which comprises a step of transmitting a first information corresponding to whether or not the accessory device stops communication to the image pickup device in response to the first request. A computer program comprising causing a computer of an imaging device to execute a process according to the communication control method according to claim 25. A computer program characterized in that a computer of an accessory device that can be attached to an imaging device is made to execute a process according to the communication control method according to claim 26.