JP5517486B2 - Camera and interchangeable lens mounted on the camera - Google Patents

Camera and interchangeable lens mounted on the camera Download PDF

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JP5517486B2
JP5517486B2 JP2009116605A JP2009116605A JP5517486B2 JP 5517486 B2 JP5517486 B2 JP 5517486B2 JP 2009116605 A JP2009116605 A JP 2009116605A JP 2009116605 A JP2009116605 A JP 2009116605A JP 5517486 B2 JP5517486 B2 JP 5517486B2
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camera
interchangeable lens
step
data
signal
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JP2010266595A (en
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樋熊  一也
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キヤノン株式会社
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Description

  The present invention relates to a camera capable of serial communication, an interchangeable lens attached to the camera, and a camera system having the camera and the interchangeable lens.

  Currently, a camera system configured to be able to communicate between a camera and a lens is widely known. In the communication of these camera systems, clock synchronous serial communication using three signal lines is generally used. Further, since the camera is the master and the lens is the slave, the camera that is the master requests required data from the lens, and the lens outputs data in response to the request. However, in this communication method, even if there is data that must be transmitted from the lens to the camera immediately, it is necessary to wait until a transmission request is received from the camera, which causes a problem of delay in data transmission. In order to solve the above problem, for example, Patent Document 1 discloses a camera system configured to transmit data from a lens without request from the camera at the time of communication of highly urgent data.

JP 2000-32324 A

  However, in the conventional technique disclosed in Patent Document 1, when a large amount of data is transmitted from the lens to the camera without a request from the camera, there is a problem that the camera cannot receive the desired data immediately. End up. Accordingly, an object of the present invention is to allow lens data to be transmitted without a request for transmission from the camera, and when data with a higher degree of urgency is required by the camera, the data is immediately communicated. It is to provide a camera system that makes it possible.

In order to achieve the above object, the present invention is capable of communicating with an interchangeable lens via a plurality of signal lines by switching between a clock synchronous serial communication mode and an asynchronous serial communication mode. A camera that transmits a signal to the interchangeable lens via a first signal line and receives a signal from the interchangeable lens via a second signal line in an asynchronous serial communication mode. The signal rejecting reception of communication data spontaneously transmitted from the interchangeable lens is transmitted via a third signal line, which is a signal line different from the first signal line and the second signal line. , A signal to be transmitted to the interchangeable lens and to transmit the communication data required by the camera is transmitted to the interchangeable lens via the first signal line, and the communication data required by the camera is Above And configured to receive from the interchangeable lens through the second signal line.

  According to the present invention, lens data can be transmitted without a request for transmission from the camera. At the same time, if more urgent data is required by the camera, a signal for refusing to receive lens data can be output, and then the lens can be requested to transmit urgent data. . Therefore, it is possible to provide a camera that can immediately perform data communication with high urgency.

It is a block diagram which shows the electric constitution of the camera system which concerns on embodiment of this invention. 3 is a timing chart showing communication between the camera and the lens of the present invention. It is a circuit diagram which performs communication between the camera and lens of this invention. It is a flowchart explaining operation | movement of the camera of this invention. It is a flowchart explaining operation | movement of the interchangeable lens 100 in Example 1 of this invention. It is a flowchart explaining operation | movement of the camera main body 200 in Example 1 of this invention. It is a flowchart explaining the operation | movement of the interchangeable lens 100 in Example 2 of this invention. It is a flowchart explaining operation | movement of the camera main body 200 in Example 2 of this invention.

  In the asynchronous mode of this embodiment, every time character information for one character is sent in serial communication, data transmission start information (start bit) at the head of data and data transmission end signal (stop bit) at the end of data. ) Is a method for sending and receiving. In the normal synchronization method, the synchronization timing of information transmitted and received can be measured by always sending a synchronization signal through a dedicated signal line. On the other hand, in the asynchronous system, synchronization is achieved by adding a synchronization signal to the data itself. The start-stop synchronization method is inferior in communication efficiency by the synchronization signal. However, the asynchronous system does not require a signal line for synchronization, and has an advantage that information can be transmitted at any timing. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing a circuit configuration of a camera system according to an embodiment of the present invention.

  The camera system according to the first embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 100 is a block diagram in an interchangeable lens, and 200 is a block diagram in a camera (camera body). Reference numeral 102 denotes a lens microcomputer, which is configured to communicate from the camera 200 side through communication contacts 115a (for clock signal), 115b (for camera → lens signal transmission), and 115c (for lens → camera signal transmission). Yes. Depending on the command value, operations of a zoom lens system (not shown), a shake correction system (shake correction lens system) 109, a focus system (focus lens system) 103, and an aperture system 104 configured as shown in FIG. Let it be done. The shake correction system 109 includes a shake sensor 111 that detects shake and a position sensor 112 that detects a correction lens displacement (not shown). Further, it comprises a shake correction drive system 110 that performs a shake correction operation by driving a correction lens (not shown) by a control signal calculated by the lens microcomputer 102 based on the outputs of the shake sensor 111 and the position sensor 112. Reference numeral 113 (IS_SW) denotes an anti-shake switch for selecting a shake correction operation. When the shake correction operation is selected, the anti-shake switch 113 is turned on. The focus system 103 includes a focus drive system 105 for driving a focus adjustment lens (not shown) and a position sensor 106 for detecting the position of the focus adjustment lens. Focusing is performed by driving a focus adjusting focus lens according to a command value from the lens microcomputer 102. Reference numeral 114 (A / M_SW) is a switch for selecting a focus operation. When automatic focus adjustment is performed, this A / M_SW is set to AUTO. The aperture system 104 includes an aperture drive system 107 for driving an aperture (not shown) and an open switch 108 for detecting whether or not the aperture is open. In accordance with a command value from the lens microcomputer 102, an operation is performed to stop the aperture to a set position or to return to the open state. The lens microcomputer 102 transmits the state (focus position, aperture value, etc.) in the lens and information about the lens (open aperture value, focal length, data necessary for distance calculation, etc.) via the communication contact described above. To the camera 200 side. The lens electrical system 101 includes the lens microcomputer 102, the focus system 103, the aperture system 104, and the shake correction system 109. The lens electrical system 101 is supplied with power from an in-camera power source 213 through a power contact 115d and a ground contact 115e. Inside the camera 200, as an electric system 201 in the camera, a distance measuring unit 203 for measuring the defocus amount from the imaging surface to the subject, and an amount of light passing through the interchangeable lens A photometric unit 204 is provided. Further, the camera 200 includes a shutter unit 205 for exposing the image sensor (CMOS sensor or the like) for an appropriate time, an image sensor unit 206, and a sound generator 207 for generating a warning sound. In addition, the camera 200 includes a display unit 208 that displays various information about the camera, an input unit 209 for a user to input an operation, and other control units 210. A camera microcomputer 202 is built in for managing the start and stop of these operations, exposure calculation, distance measurement calculation, and the like. The power for these electric systems 201 in the camera is also supplied from the in-camera power source 213. 211 (SW1) is a switch for starting photometry and distance measurement. 212 (SW2) is a switch for starting the release operation. These are generally two-stage stroke switches, and are configured such that the switch SW1 is turned on at the first stroke of the release button and the switch SW2 is turned on at the second stroke. Further, the camera 200 includes electrical contacts 214a (for clock signal), 214b (for camera → lens signal transmission), and 214c (for lens → camera signal transmission) for communicating with the interchangeable lens 100. .

  In addition, the camera 200 includes a power contact 214d and a ground contact 214e for supplying power. FIG. 4 is a flowchart showing a specific processing operation in the camera microcomputer 202 of FIG. The operation will be described below with reference to the flowchart of FIG.

  “Step # 101” The interchangeable lens 100 is attached to the camera 200, and this operation starts.

"Step # 102" Start clock synchronous serial communication. Clock synchronous serial communication is a method of communication using three signal lines, and communication is performed using signals as shown in the clock synchronous serial communication of FIG.
A signal communicated through the signal line (third signal line) 115a to 214a is output from the camera body 200 as a clock signal. Signals communicated via the signal lines (first signal lines) 115b to 214b are signals transmitted from the camera 200 to the interchangeable lens 100, and are “0A” and “00” in MSB first reading. It is output.
Signals communicated via the signal lines (second signal lines) 115c to 214c are signals transmitted from the interchangeable lens 100 to the camera 200. Similarly, "00" and "AA""Is output. These two signals are output in synchronization with the falling edge of the clock signal. Reading is performed in synchronization with the rising edge of the clock signal. Therefore, in clock synchronous communication, the communication timing is determined by the camera 200 that outputs a clock signal. Therefore, even if the state of the interchangeable lens 100 changes and information to be sent to the camera 200 is generated, there is a problem that the information cannot be transmitted unless the camera 200 communicates. Therefore, the camera 200 needs to constantly communicate with the interchangeable lens 100, and communication processing becomes a burden. The interchangeable lens 100 is also burdened with communication processing.

  “Step # 103” Initial communication is performed using clock synchronous serial communication. In the initial communication, information indicating the function and type of the interchangeable lens 100 is communicated.

  Information regarding the interchangeable lens 100 obtained by the initial communication of “Step # 104” and “Step # 103” is received and stored.

  “Step # 105” It is determined from the information of the interchangeable lens 100 obtained by the initial communication whether or not the interchangeable lens 100 is compatible with asynchronous serial communication.

  If it corresponds, the process proceeds to “Step # 106”, and if not, the process proceeds to “Step # 108”.

  “Step # 106” An asynchronous serial communication start request for starting asynchronous serial communication is transmitted to the interchangeable lens 100.

“Step # 107” Communication is performed by asynchronous serial communication. Here, the asynchronous communication serial communication signal will be described with reference to FIG. In asynchronous serial communication, two signal lines are used. In FIG. 2, 115b-214b and 115c-214c are signal lines for asynchronous serial communication. Signals communicated via the signal lines (first signal lines) 115b to 214b are signals transmitted from the camera 200 to the interchangeable lens 100, and include a start bit “1”, a stop bit “0”, and a parity. When read as a setting of “none”, “0A” and “00” are output. Signals communicated via the signal lines (second signal lines) 115c to 214c are signals transmitted from the interchangeable lens 100 to the camera 200, and similarly, a start bit “1”, a stop bit “0”, When read as the setting of parity “none”, “00” and “AA” are output. The asynchronous serial communication mode has an advantage that the interchangeable lens 100 can communicate at an arbitrary timing because there is no synchronous clock signal. On the other hand, a start bit for notifying the start of communication is required, and the communication speed is inferior to that of the clock synchronous serial communication mode. The operation on the interchangeable lens 100 side when performing the asynchronous communication mode is shown in the flowchart of FIG. 5, and the operation of the camera 200 is shown in the flowchart of FIG.

  “Step # 108” Since the interchangeable lens 100 is incompatible with the asynchronous communication mode, the communication in the clock synchronization method is continued.

  “Step # 109” The operation of the present embodiment is terminated.

  Next, the operation of the interchangeable lens 100 when performing the asynchronous serial communication mode will be described with reference to the flowchart of FIG.

  “Step # 201” Asynchronous serial communication is started in the flowchart “Step # 107” in FIG.

  “Step # 202” It is determined whether or not there is a data transmission request from the camera 200. Specifically, it is determined whether or not there is communication from the camera 200 through the signal line 115b-214b in FIG. If there is a data transmission request, the process proceeds to “Step # 211”. If there is no data transmission request, the process proceeds to “Step # 203”.

  “Step # 203” It is determined whether or not a predetermined time has elapsed in the interchangeable lens 100. In this embodiment, shake data detected by the shake sensor 111 in the lens is transmitted to the camera at predetermined time intervals. Here, it is determined whether or not a predetermined time has elapsed. If the predetermined time has elapsed, the process returns to “Step # 204”, and if the predetermined time has not elapsed, the process returns to “Step # 202”.

  “Step # 204” The signal line is set to Hi. Specifically, the signal lines 115a to 214a of the asynchronous serial communication in FIG. 2 are set to Hi. FIG. 3 is an electric circuit of the communication interface unit of the present embodiment. The signal line 214a on the lens side is pulled up via a pull-up resistor. Therefore, Hi can be output to the terminal 214a by setting the gate of the NchMOS to Low. By setting this signal line to Hi, the interchangeable lens 100 informs the camera body 200 side that a change has occurred in the data in the interchangeable lens 100 and that communication is voluntarily started.

  “Step # 205” Prepare to start transmission. Specifically, various registers are set in order to read data obtained from the output of the shake sensor 111 stored in the lens microcomputer 102 and transmit the data by asynchronous serial communication.

  “Step # 206” It is determined whether or not the state of the terminal 214a is at a low level. If it is Low, the process proceeds to “Step # 207”, and if it is Hi, the process proceeds to “Step # 208”. Even though Hi is output from the interchangeable lens 100 to the terminal 214a in “Step # 204”, it is Low which is an inverted signal of Hi. The camera 200 outputs Low to this signal line. It means that there is. This indicates that the camera 200 refuses communication of shake data from the interchangeable lens 100.

  “Step # 207” Since the state of the terminal 214a is Low, which is an inverted signal of Hi, and the camera 200 refuses communication, transmission stop processing is performed.

  “Step # 208” Since the state of the terminal 214a is Hi and the camera 200 accepts communication, data transmission is performed.

  “Step # 209” It is determined whether or not transmission of data to be transmitted has been completed. If completed, the process proceeds to “Step # 210”, and if not completed, the process returns to “Step # 206” to transmit the remaining data.

  “Step # 210” Since the communication of data to be transmitted has been completed, a transmission end process is performed.

  “Step # 211” Since there was a data transmission request from the camera in “Step # 202”, Low is output to the signal line 214a. Specifically, the gate voltage of the Nch MOS connected to the 214a terminal is set to Hi, and the MOS is turned on. By doing so, the signal line is connected to the GND level and can output Low.

  “Step # 212” Prepare to start transmission. Specifically, various registers are set in order to read data to be transmitted to the camera stored in the lens microcomputer 102 and transmit the data by asynchronous serial communication.

  “Step # 213” Data requested by the camera 200 is transmitted.

  “Step # 214” It is determined whether or not transmission of data to be transmitted has been completed. If completed, the process proceeds to “Step # 210”, and if not completed, the process returns to “Step # 213” to transmit the remaining data. The operation of the interchangeable lens 100 when performing asynchronous communication has been described above. Next, the operation of the camera 200 in the asynchronous serial communication mode will be described using the flowchart of FIG.

  "Step # 301" Asynchronous serial communication is started in the flowchart "Step # 107" in FIG.

  “Step # 302” In the processing of the camera 200, it is determined whether or not there is necessary data for the interchangeable lens 100.

  If there is necessary data, go to “Step # 309”, otherwise go to “Step # 303”.

  “Step # 303” It is determined whether the signal line is Hi.

  If the signal line is Hi, it indicates that shake data is sent from the interchangeable lens 100.

  If the signal line is Hi, the process returns to “Step # 304”, and if not, the process returns to “Step # 302”.

  “Step # 304” When shake data is received from the interchangeable lens 100, it is determined whether there is data with a higher priority. If there is data with high priority, the process proceeds to “Step # 307”. If there is no communication data with high priority, the process proceeds to “Step # 305”. Here, the communication data with high priority refers to, for example, a case where an auto-focus operation is required suddenly by a user operation, and information related to focus is required rather than information related to shake.

  “Step # 305” The shake communication data from the interchangeable lens 100 is received.

  "Step # 306" It is determined whether all the shake communication data currently being received has been received. If the reception is completed, the process returns to “Step # 302”, and if not completed, the process returns to “Step # 304”.

  “Step # 307” The output of the terminal 115a is set to Low. The circuit of the communication interface unit of the camera body 200 of the present embodiment is as shown in FIG. 3, and outputs “Low” by applying Hi to the gate voltage of the Nch MOS as in the above-described interchangeable lens 100 side. By setting the signal between 115a and 214a to Low, the interchangeable lens 100 side prohibits the transmission of shake data to the camera side, and enters a state in which information requested by the camera body 200 side is transmitted. Switch.

  “Step # 308” A data transmission request is output to the interchangeable lens 100.

  “Step # 309” Communication data from the interchangeable lens 100 is received.

  “Step # 310” It is determined whether all data currently being received has been received.

  In this embodiment, it is assumed that the communication data of the interchangeable lens 100 has a different data length depending on the type. The data length information is included in the header information, and it is determined whether or not data corresponding to the information has been received. If the reception is completed, the process proceeds to “Step # 311”. If the reception is not completed, the process returns to “Step # 309” to continue the reception.

  “Step # 311” Since the reception of the requested communication data has been completed, the communication line between 115a and 214a is set to Hi. The signal line 115a of the camera 200 is pulled up via a pull-up resistor. Therefore, Hi can be output to the terminal 115a by setting the gate of the NchMOS to Low. By setting the signal line between 115a and 214a to Hi, the interchangeable lens 100 can communicate shake data to the camera 200 side every predetermined time.

  As described above, according to the present embodiment that has been described, the interchangeable lens 100 can transmit the shake communication data to the camera 200 spontaneously (voluntarily) at predetermined time intervals.

  For this reason, it is possible to minimize the delay in information transmission that has conventionally occurred due to waiting for communication from the camera 200.

Further, the camera 200 confirms the state of the signal lines 115a to 214a (first signal lines) , so that the data sent from the interchangeable lens 100 is shake correction data or other communication data. Can be determined. Furthermore, when high-priority information is required during shake data reception, transmission to the interchangeable lens 100 side can be stopped, and high-priority information can be requested. For this reason, for example, it becomes possible to communicate information with high priority from the interchangeable lens 100 to information that has been urgently required by the user's operation, and the time lag can be reduced.

  Subsequently, a second embodiment of the present invention will be described. A block diagram of a camera system according to an embodiment of the present invention is shown in FIG. Since the explanation was made in the first embodiment, it is omitted here. The detailed operation will be described below. First, the operation shown in the flowchart of FIG. 4 is performed in the camera microcomputer 202 of FIG. Since this operation has been described in the first embodiment, it is omitted here. Next, the operation when the interchangeable lens 100 performs the asynchronous serial communication mode will be described with reference to the flowchart of FIG.

  "Step # 401" Asynchronous serial communication is started in the flowchart "Step # 107" in FIG.

  “Step # 402” It is determined whether or not there is a data transmission request from the camera 200. Specifically, it is determined whether or not there is communication from the camera 200 through the signal line 115b-214b in FIG. If there is a data transmission request, the process proceeds to “Step # 411”. If there is no data transmission request, the process proceeds to “Step # 403”.

  “Step # 403” It is determined whether there is data changed in the interchangeable lens 100 or not. For example, when the interchangeable lens 100 is a zoom lens, the focal length data changes due to the change in focal length due to the change in the zoom position. If there is changed data, the process returns to “Step # 404”, and if there is no changed data, the process returns to “Step # 402”.

  “Step # 404” The signal line is set to Hi. Specifically, the signal lines 115a to 214a of the asynchronous serial communication in FIG. 2 are set to Hi. FIG. 3 is an electric circuit of the communication interface unit of the present embodiment. The signal line 214a on the interchangeable lens 100 side is pulled up via a pull-up resistor. Therefore, Hi can be output to the terminal 214a by setting the gate of the NchMOS to Low. By setting this signal line to Hi, the interchangeable lens 100 informs the camera 200 side that the data in the interchangeable lens 100 has changed, so that communication is started voluntarily.

  “Step # 405” Prepare to start transmission. Specifically, various registers are set in order to read data to be transmitted to the camera 200 stored in the lens microcomputer 102 and transmit the data by asynchronous serial communication.

  “Step # 406” It is determined whether or not the state of the terminal 214a is at a low level. If it is Low, the process proceeds to “Step # 407”, and if it is Hi, the process proceeds to “Step # 408”. Even though Hi is output from the interchangeable lens 100 to “Terminal # 404” to the terminal 214a, it is Low which is an inverted signal of Hi. This means that the camera 200 outputs Low to this signal line. It means that you are doing. This indicates that the camera 200 rejects spontaneous (voluntary) communication from the interchangeable lens 100.

  “Step # 407” Since the state of the terminal 214a is Low, which is an inverted signal of Hi, and the camera 200 refuses communication, transmission stop processing is performed.

  “Step # 408” Since the state of the terminal 214a is Hi and the camera 200 accepts communication, data transmission is performed.

  “Step # 409” It is determined whether or not transmission of data to be transmitted has been completed.

  If completed, the process proceeds to “Step # 410”, and if not completed, the process returns to “Step # 406” to transmit the remaining data.

  “Step # 410” Since the communication of data to be transmitted has been completed, a transmission end process is performed.

  “Step # 411” Since there was a data transmission request from the camera in “Step # 402”, Low is output to the signal line 214a. Specifically, the gate voltage of the Nch MOS connected to the 214a terminal is set to Hi, and the MOS is turned on. By doing so, the signal line is connected to the GND level and can output Low.

  “Step # 412” Prepare to start transmission. Specifically, various registers are set in order to read data to be transmitted to the camera stored in the lens microcomputer 102 and transmit the data by asynchronous serial communication.

  “Step # 413” Communication data requested from the camera 200 is transmitted.

  “Step # 414” It is determined whether transmission of data to be transmitted has been completed. If completed, the process proceeds to “Step # 410”, and if not completed, the process returns to “Step # 413” to transmit the remaining data. The operation of the interchangeable lens 100 when performing asynchronous communication has been described above. Next, the operation of the camera 200 in the asynchronous serial communication mode will be described using the flowchart of FIG.

  “Step # 501” Asynchronous serial communication is started in the flowchart “Step # 107” in FIG.

  “Step # 502” In the processing of the camera 200, it is determined whether or not there is necessary data for the interchangeable lens 100.

  If there is necessary data, the process proceeds to “Step # 508”, and if there is no necessary data, the process proceeds to “Step # 503”.

  “Step # 503” It is determined whether communication data from the interchangeable lens 100 has been received. If there is received data, the process returns to "Step # 504", and if not received, the process returns to "Step # 502".

  “Step # 504” The type of data received from the interchangeable lens 100 is determined. In the present embodiment, it is assumed that the data received from the interchangeable lens 100 includes header information, and the type of data received from the information is determined.

  “Step # 505” When communication data is received from the interchangeable lens 100, it is determined whether there is data having a higher priority than data being received. If there is data with high priority, the process proceeds to “Step # 508”. If there is no data with high priority, the process proceeds to “Step # 506”. The high priority data here is, for example, data that is currently being received, which is information related to exposure, which requires a quick autofocus operation by the user's operation, and information related to focus is required rather than information related to exposure. This refers to the case.

  “Step # 506” Data from the interchangeable lens 100 is received.

  “Step # 507” It is determined whether all data currently being received has been received. In the present embodiment, it is assumed that the data length of the interchangeable lens 100 varies depending on the type. The data length information is included in the header information described above, and it is determined whether or not data corresponding to the information has been received. If the reception is completed, the process returns to “Step # 502”, and if not completed, the process returns to “Step # 505”.

  “Step # 508” The output of the terminal 115a is set to Low. The circuit of the communication interface unit of the camera 200 according to the present embodiment is as shown in FIG. 3, and outputs Low by applying Hi to the gate voltage of the Nch MOS as in the interchangeable lens 100 side. By setting the signal between 115a and 214a to Low, the interchangeable lens 100 side prohibits transmission of information to the camera 200 side by its own judgment, and transmits information requested by the camera 200 side. Switch to.

  “Step # 509” A data transmission request is output to the interchangeable lens 100.

  “Step # 510” Data from the interchangeable lens 100 is received.

  "Step # 511" It is determined whether all data currently being received has been received.

  In the present embodiment, it is assumed that the data length of the interchangeable lens 100 is different depending on the type as described above. The data length information is included in the header information described above, and it is determined whether or not data corresponding to the information has been received. If the reception is completed, the process proceeds to “Step # 512”. If the reception is not completed, the process returns to “Step # 510” to continue the reception.

  “Step # 512” Since the reception of the requested data has been completed, the communication line between 115a and 214a is set to Hi. The signal line 115a of the camera 200 is pulled up via a pull-up resistor. Therefore, Hi can be output to the terminal 115a by setting the gate of the NchMOS to Low. By setting the signal line between 115a and 214a to Hi, the interchangeable lens 100 voluntarily (voluntarily) to the camera 200 when it detects a change in information caused by a change in its zoom position or focus position. Information can be communicated.

  As described above, according to the present embodiment described above, the interchangeable lens 100 can transmit information to the camera 200 spontaneously (voluntarily) when its information changes. For this reason, it is possible to minimize the delay in information transmission that has conventionally occurred due to waiting for communication from the camera 200. Further, the camera 200 side stops transmission to the interchangeable lens 100 side and requests information with high priority when information with high priority is required during autonomous communication and reception from the interchangeable lens 100. be able to. For this reason, for example, it becomes possible to communicate information with high priority from the interchangeable lens 100 to information that has been urgently required by the user's operation, and the time lag can be reduced.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

DESCRIPTION OF SYMBOLS 100 Interchangeable lens 101 Electric system in interchangeable lens 102 Lens microcomputer 200 Camera main body 201 Electric system in camera main body 202 Camera microcomputer

Claims (4)

  1. Switching between a clock synchronous serial communication mode and an asynchronous serial communication mode is possible , and communication with an interchangeable lens is possible via a plurality of signal lines. In the asynchronous serial communication mode, the first A camera that transmits a signal to the interchangeable lens via a signal line and receives a signal from the interchangeable lens via a second signal line ;
    Through a third signal line, which is a signal line that is different from the first signal line and the second signal line, a signal for refusing reception of communication data spontaneously transmitted from the interchangeable lens, Send to the interchangeable lens,
    A signal for transmitting the communication data requested by the camera is transmitted to the interchangeable lens via the first signal line;
    Communication data requested by the camera is received from the interchangeable lens via the second signal line .
  2. Reject signal reception of communication data are spontaneously transmitted from the interchangeable lens is characterized by an inverted signal of a signal indicating whether the communication data are spontaneously transmitted from the interchangeable lens The camera according to claim 1.
  3. The third signal line, a camera according to claim 1 or 2, characterized in that the serial communication mode smell of the clock synchronous Te is a signal line for clock signal is input.
  4.   A camera system comprising the camera according to any one of claims 1 to 3 and an interchangeable lens attached to the camera.
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