JP5853516B2 - Manual focus interchangeable lens and camera system - Google Patents

Description

  The present invention relates to a manual focus type interchangeable lens and a camera system.

  In a camera system including a camera body and an interchangeable lens, a technique is known in which the camera body performs automatic focus adjustment by driving a focus adjustment lens in the interchangeable lens. When performing automatic focusing, the camera body needs to acquire position information of the focusing lens from the interchangeable lens. For example, Patent Document 1 describes a photographic lens in which a moving signal generation unit including an encoder or the like is provided in a focusing lens drive system. The movement signal generator outputs positive and negative two-phase pulse signals according to the back and forth movement of the focusing lens. The output pulse signal is transmitted to the body side control unit in the camera body. From this pulse signal, the camera body can detect the moving distance of the focusing lens in units of the number of pulses.

  In the configuration described in Patent Document 1, when information related to the driving state of optical members other than the focusing lens is transmitted to the camera body, an encoder must be added for each optical member. Since the addition of the encoder causes an increase in manufacturing cost and an increase in the size of the housing, it is conceivable to introduce a new transmission path for transmitting information on the driving state of the optical member instead of the encoder.

JP 2008-97006 A

  When a new transmission path for transmitting information on the driving state of the optical member is introduced, the CPU in the interchangeable lens needs to control two of the control transmission path and the new transmission path. In the prior art, no consideration has been given as to what control should be performed when processing for controlling each of these two transmission paths occurs simultaneously.

(1) When the manual focus type interchangeable lens according to the invention of claim 1 transmits / receives various signals to / from the autofocus type interchangeable lens, a drive command signal relating to driving of the focus lens of the autofocus type interchangeable lens Is transmitted via the first transmission path, receives lens data relating to the position of the focus lens via a second transmission path different from the first transmission path, and generates a drive command signal based on the lens data. A first body side signal line for transmitting a signal for requesting communication start related to transmission of lens data by the second transmission path , and a signal indicating that the communication preparation is completed are exchanged in an autofocus type. A second body side signal line for receiving from the lens and a third body for receiving lens data from the autofocus interchangeable lens; A first body side contact connected to the first body side signal line, a second body side contact connected to the second body side signal line, and a third body A manual focus type interchangeable lens that is detachably attached to a camera body having a third body side contact connected to the side signal line, and is electrically connected to the first body side contact when attached to the camera body. A first lens-side contact to be connected, a second lens-side contact electrically connected to the second body-side contact when attached to the camera body, and a third body-side contact when attached to the camera body electrically and third lens side contact to be connected, a signal indicating that the interchangeable lens mounted on the camera body is interchangeable lens manual focusing type through the second lens side contact output The that identification signal output means, characterized in that it comprises a.
(2) a camera system according to the invention of claim 2 is the camera system comprising a camera body, an interchangeable lens detachably attached to the camera body, the camera body, between the exchange lens of the autofocusing The body-side first transmission path and the body-side first transmission path for the body-side transmission / reception means to transmit / receive various signals between the body-side transmission / reception means for transmitting and receiving various signals and the autofocus interchangeable lens are different. A second body-side transmission line; a determination means for determining whether or not the interchangeable lens attached to the camera body is an autofocus interchangeable lens; and a drive command signal relating to driving of the focus lens of the autofocus interchangeable lens Drive command signal generating means for generating the body side transmitting / receiving means attached to the camera body by the judging means When it is determined that the interchangeable lens is an autofocus interchangeable lens, at least the drive command signal generated by the drive command signal generating means is transmitted via the body-side first transmission path, and the body-side transmitting / receiving means is transmitted. When the determination means determines that the interchangeable lens attached to the camera body is an autofocus interchangeable lens, a signal for requesting the start of communication related to transmission of lens data relating to the position of the focus lens is sent to the body side second signal. and transmits to the auto focus type interchangeable lens through the transmission path, the lens data transmitted from the auto focus type interchangeable lens received through a second body-side transmission path, the drive command signal generating means, the body-side via the second transmission path to generate a drive command signal on the basis of the lens data received by the body-side transmitting and receiving means, the second body-side Sending passage is for receiving a first body side signal line for transmitting a signal requesting start of communication according to the transmission of lens data, a signal indicating that the communication is ready from the auto focus type interchangeable lens A first body side contact connected to the first body side signal line, including a second body side signal line and a third body side signal line for receiving lens data from the interchangeable lens; A second body side contact connected to the second body side signal line; and a third body side contact connected to the third body side signal line. When the interchangeable lens mounted from the interchangeable lens to the camera body via a line to receive a signal indicating that it is a replacement lens for manual focus type, the interchangeable lens mounted on the camera body manual focusing type Determines that the interchangeable lens, when the second body-side signal line interchangeable lens mounted from the interchangeable lens to the camera body via a does not receive a signal indicating that the interchangeable lens manual focus type, the camera It is determined that the interchangeable lens attached to the body is an autofocus interchangeable lens, and the interchangeable lens includes a first lens side contact that is electrically connected to the first body side contact when attached to the camera body. A second lens side contact that is electrically connected to the second body side contact when attached to the camera body, and a third that is electrically connected to the third body side contact when attached to the camera body. If the interchangeable lens is a manual focus interchangeable lens, the interchangeable lens attached to the camera body is It further comprises identification signal output means for outputting a signal indicating that it is a dual focus type interchangeable lens through the second lens side contact .

  According to the present invention, communication can be normally performed even when processing for controlling each of the two transmission paths occurs simultaneously.

It is a figure which shows the external appearance of the camera system which concerns on one embodiment of this invention. It is sectional drawing which shows the structure of the camera system 1 which concerns on one embodiment of this invention. 2 is a block diagram illustrating details of a transmission path between a camera body 100 and an interchangeable lens 200. FIG. It is a wave form diagram showing command data communication. It is a wave form diagram showing hot line communication. It is a wave form chart when generation processing arises during execution of control processing. It is a wave form diagram when control processing arises during execution of generation processing. 1 is a cross-sectional view illustrating a configuration of a camera system 1 according to an embodiment in which an interchangeable lens 800 is attached to a camera body 100. FIG. 4 is a block diagram illustrating details of a transmission path between the camera body 100 and the interchangeable lens 800. FIG.

  FIG. 1 is a diagram showing an appearance of a camera system according to an embodiment of the present invention. The camera system 1 includes a camera body 100 and interchangeable lenses 200 and 800. The interchangeable lens 200 is an autofocus lens that is detachably attached to the camera body 100. The interchangeable lens 800 is a manual focus lens that is detachably attached to the camera body 100. The interchangeable lenses 200 and 800 are attached by fitting the lens side lens mount 201 of the interchangeable lenses 200 and 800 into the body side lens mount 101 of the camera body 100.

  The body side lens mount 101 has a plurality of contacts 310B and 320B for data communication and power supply. On the lens side lens mount 201, there are a plurality of contacts 310L and 320L corresponding to the plurality of contacts 310B and 320B, respectively. When the interchangeable lenses 200 and 800 are attached to the camera body 100, the contact points 310B and 320B and the contact points 310L and 320L are connected, and power for operating the interchangeable lenses 200 and 800 is supplied from the camera body 100 to the interchangeable lenses 200 and 800. At the same time, data communication described later can be performed between the camera body 100 and the interchangeable lenses 200 and 800.

  The camera body 100 includes a body CPU 103. The body CPU 103 controls each part in the camera body 100 by executing a predetermined control program. On the other hand, the interchangeable lenses 200 and 800 each include a lens CPU 203. The lens CPU 203 executes a predetermined control program, thereby controlling each part in the interchangeable lens 200 and performing control processing and generation processing described later. In the following description, the case where the interchangeable lens attached to the camera body 100 is the interchangeable lens 200 (autofocus lens) will be described. The description of the case where the interchangeable lens attached to the camera body 100 is the interchangeable lens 800 (manual focus lens) will be given later.

  The image sensor 104 captures a subject image and outputs an image signal. When a release switch 107 provided on the camera body 100 is pressed, the body CPU 103 performs various image processing on the image pickup signal to create image data. The created image data is stored in the portable storage medium 106 in the storage medium insertion port 105.

  FIG. 2 is a cross-sectional view showing a configuration of the camera system 1 according to the present embodiment. The interchangeable lens 200 includes an imaging optical system 210 including a plurality of lenses 210a to 210e and a diaphragm 210f. Of these lenses, for example, the lens 210d is a focus lens that is driven for focus adjustment. The lens 210e is a blur correction lens. In accordance with an instruction from the body CPU 103, the lens CPU 203 drives the focus lens 210d, the blur correction lens 210e, the diaphragm 210f, and the like by an actuator (not shown).

  A filter 111 including an optical low-pass filter and an infrared cut filter is installed on the front surface of the image sensor 104. The subject light that has passed through the imaging optical system 210 in the interchangeable lens 200 enters the imaging element 104 via the filter 111 with the optical axis R as the center. The body CPU 103 creates a display image from the imaging signal output from the imaging element 104 and displays it on the LCD module 110 installed on the back surface of the camera body 100.

  Between the body CPU 103 and the lens CPU 203, that is, between the camera body 100 and the interchangeable lens 200, two transmission paths are provided via the contacts 310B and 320B and the contacts 310L and 320L shown in FIG. . Since these two transmission lines are independent of each other, even if data is transmitted through one transmission line, it is possible to transmit data through the other transmission line. In the following description, the two transmission paths are referred to as a first transmission path 301 and a second transmission path 302, respectively. Communication performed using the first transmission path 301 is referred to as command data communication, and communication performed using the second transmission path 302 is referred to as hot line communication. The signal lines constituting the first transmission path 301 and the second transmission path 302, and specific communication contents of command data communication and hot line communication will be described in detail later.

  In the camera body 100, a body-side first communication circuit 112 that performs command data communication and a body-side second communication circuit 113 that performs hotline communication are installed. Each of these circuits is connected to the body CPU 103. Similarly, in the interchangeable lens 200, a lens-side first communication circuit 212 that performs command data communication and a lens-side second communication circuit 213 that performs hotline communication are installed. Each of these circuits is connected to the lens CPU 203.

  The body-side first communication circuit 112 and the lens-side first communication circuit 212 are connected to each other by the first transmission path 301. Similarly, the body side second communication circuit 113 and the lens side second communication circuit 213 are connected to each other by the second transmission path 302. The first lens-side communication circuit 212 receives control data described later from the first body-side communication circuit 112 in the camera body 100 via the first transmission path 301 and transmits control data prepared on the interchangeable lens 200 side. To do.

(Description of each transmission line)
FIG. 3 is a block diagram illustrating details of a transmission path between the camera body 100 and the interchangeable lens 200. In FIG. 3, a transmission path for data communication is described, and descriptions of contacts and power supply lines related to power supply are omitted. The lens-side first communication circuit 212 includes four communication terminals ORDY, ICLK, IDATAB, and ODATAL. The body-side first communication circuit 112 includes four communication terminals IRDY, OCLK, ODATAB, and IDATAL corresponding to these terminals. The first transmission path 301 includes four signal lines RDY, CLK, DATAB, and DATAL that connect these four pairs of communication terminals. That is, command data communication is performed using these four signal lines.

  The first communication circuit 212 on the lens side sends information indicating whether communication can be started to the signal line RDY. The body-side first communication circuit 112 sends a clock signal for data communication to the signal line CLK. The body-side first communication circuit 112 sends a data signal to the signal line DATAB. The lens-side first communication circuit 212 sends a data signal to the signal line DATAL.

  Similarly, the lens side second communication circuit 213 includes four communication terminals IHREQ, OHANS, IHCLK, and OHDATAL. The body-side second communication circuit 113 includes four communication terminals OHREQ, IHANS, OHCLK, and IHDATAL corresponding to these terminals. The second transmission path 302 includes four signal lines HREQ, HANS, HCLK, and HDATAL that connect these four pairs of communication terminals. That is, hot line communication is performed using these four signal lines.

  The body side second communication circuit 113 sends a signal requesting the start of communication to the signal line HREQ. The lens side second communication circuit 213 sends a signal indicating that communication preparation is complete to the signal line HANS. The body-side second communication circuit 113 sends a clock signal for data communication to the signal line HCLK. The lens-side second communication circuit 213 sends a data signal to the signal line HDATAT.

  As described above, the camera body 100 is provided with the contacts 310B and 320B. The contact 310B includes camera body side contacts (body side contacts) 311B, 312B, 313B, and 314B for each of the four signal lines RDY, CLK, DATAB, and DATAL of the first transmission path 301. Further, the contact 320B includes camera body side contacts (body side contacts) 321B, 322B, 323B, and 324B for each of the four signal lines HREQ, HANS, HCLK, and HDATAL of the second transmission path 302.

  As described above, the interchangeable lens 200 is provided with the contacts 310L and 320L. The contact 310L includes interchangeable lens side contacts (lens side contacts) 311L, 312L, 313L, and 314L for each of the four signal lines RDY, CLK, DATAB, and DATAL of the first transmission path 301. The contact 320L includes interchangeable lens side contacts (lens side contacts) 321L, 322L, 323L, and 324L for each of the four signal lines HREQ, HANS, HCLK, and HDATAL of the second transmission path 302.

  When the interchangeable lens 200 is attached to the camera body 100, each body side contact 311 and each lens side contact come into contact with each other and are electrically connected. That is, when the interchangeable lens 200 is attached to the camera body 100, the body side contact 311B and the lens side contact 311L are electrically connected, the body side contact 312B and the lens side contact 312L are electrically connected, and the body side The contact 313B and the lens side contact 313L are electrically connected, and the body side contact 314B and the lens side contact 314L are electrically connected. Similarly, when the interchangeable lens 200 is attached to the camera body 100, the body side contact 321B and the lens side contact 321L are electrically connected, and the body side contact 322B and the lens side contact 322L are electrically connected. The side contact 323B and the lens side contact 323L are electrically connected, and the body side contact 324B and the lens side contact 324L are electrically connected.

  When the body CPU 103 detects that the signal level of the signal line RDY has changed from the high impedance state to H or L in the body-side first communication circuit 112, the interchangeable lens 200 or the interchangeable lens 800 is attached to the camera body 100. Judge that Then, the body CPU 103 determines whether the signal level of the signal line HANS detected by the body-side second communication circuit 113 is H or L. When the signal level of the signal line RDY is L, the body CPU 103 determines that the interchangeable lens 800, which is a manual focus lens, is attached to the camera body 100, and starts various communications described in detail later. When the signal level of the signal line RDY is H, the body CPU 103 determines that the interchangeable lens 200 that is an autofocus lens is attached to the camera body 100, and starts various communications described below.

(Description of command data communication)
In command data communication, the body-side first communication circuit 112 and the lens-side first communication circuit 212 simultaneously send data signals to each other in synchronization with the clock signal output from the body-side first communication circuit 112. That is, command data communication is full-duplex data communication in which data is transmitted simultaneously in both directions.

  In this embodiment, data exchanged by command data communication is composed of two partial data. In the following description, the first partial data is called a command packet, and the second partial data is called a data packet. The command packet and the data packet are collectively referred to as control data. That is, command data communication is communication for transmitting and receiving control data between the camera body 100 and the interchangeable lens 200. The lens CPU 203 executes a control process (described later) based on the received partial data each time the partial data is received by the lens-side first communication circuit 212.

  The command packet is data representing a command from the body CPU 103 to the lens CPU 203. In the present embodiment, the command packet is 5-byte data, of which 1 byte is another 4-byte checksum. In the present embodiment, the command packet transmitted from the lens CPU 203 to the body CPU 103 is dummy data. Specifically, the lens CPU 203 transmits “0” for 5 bytes as a command packet.

  In the present embodiment, the command packet transmitted from the body CPU 103 is either a command for driving a member included in the interchangeable lens 200 or a command for transmitting information regarding the interchangeable lens 200. Examples of the former command include a command for driving the focus lens 210d and the shake correction lens 210e, a command for driving the diaphragm 210f, and the like. As the latter command, a command that requests the interchangeable lens 200 to transmit information (for example, a command to transmit the model name of the interchangeable lens 200, focal length information (zoom position information), aperture position, lens characteristic information (optical aberration information)). ) Is transmitted.

  The data packet is data transmitted along with the command packet, and the content differs depending on the content of the command packet. For example, if the command packet transmitted from the body CPU 103 represents an instruction to drive the focus lens 210d, the data packet transmitted thereafter by the body CPU 103 is the target to be driven (focus lens 210d, blur correction lens 210e, aperture 210f). The data packets transmitted by the lens CPU 203 are all “0” dummy data. Further, when the command packet transmitted from the body CPU 103 represents an instruction to transmit lens information (for example, the model name of the interchangeable lens 200), the data packets transmitted thereafter by the body CPU 103 are all “0” dummy data. The data packet transmitted by the lens CPU 203 includes data representing the lens information (for example, character string data representing the model name of the interchangeable lens 200) and a checksum. Note that a 1-byte checksum is added to the data packet as in the case of the command packet.

  FIG. 4 is a waveform diagram showing command data communication. Command data communication is started by the body CPU 103. The body CPU 103 first writes a command packet to be transmitted to a buffer memory provided in the body-side first communication circuit 112. Next, the body CPU 103 sends a transmission start signal to the body-side first communication circuit 112. The body-side first communication circuit 112 to which the transmission start signal is input confirms the signal level of the signal line RDY. The lens side first communication circuit 212 sets the signal level of the signal line RDY to H when preparation for communication is not completed. When the signal level of the signal line RDY is H, the body-side first communication circuit 112 does not transmit each signal until the signal level becomes L.

  If the signal level of the signal line RDY is L, the body-side first communication circuit 112 starts sending the clock signal 401 and the command packet signal 402 (time T1 in FIG. 4). Here, the command packet signal 402 is a serial signal representing the command packet (including a checksum). The clock signal 401 is sent to the signal line CLK, and the command packet signal 402 is sent to the signal line DATAB. At this time, a 5-byte command packet (including a checksum) is written in the buffer memory inside the body-side first communication circuit 112. Therefore, the clock signal 401 and the command packet signal 402 have a length of 5 bytes.

  The lens-side first communication circuit 212 sends a command packet signal 403 to the signal line DATAL in synchronization with the clock signal 401 sent by the body-side first communication circuit 112. As described above, the command packet transmitted from the lens side first communication circuit 212 is “0” for 5 bytes. Therefore, the command packet signal 403 is a serial signal representing the same length as the command packet signal 402, that is, “0” for 5 bytes.

  The body-side first communication circuit 112 receives the command packet signal 403 sent to the signal line DATAL, and writes the data (including the checksum) represented by this signal to the buffer memory inside the body-side first communication circuit 112. . Similarly, the lens side first communication circuit 212 receives the command packet signal 402 sent to the signal line DATAB, and writes the data represented by this signal in the buffer memory inside the lens side first communication circuit 212. Transmission / reception of these data is performed by the body side first communication circuit 112 and the lens side first communication circuit 212. That is, the body CPU 103 and the lens CPU 203 can execute other processes during transmission / reception of these data.

  When the transmission / reception of the command packet is completed, the lens side first communication circuit 212 sets the signal level of the signal line RDY to H and causes the lens CPU 203 to generate a transmission / reception completion interrupt (time T2 in FIG. 4). In response to this interruption, the lens CPU 203 starts executing the first control process 404. The first control process 404 is a process for preparing for data packet transmission. In the first control process 404, the lens CPU 203 reads a command packet received from the buffer memory in the lens-side first communication circuit 212 and writes it in a main memory (not shown). Then, based on the contents of the command packet (analyzing the contents of the command packet), the data packet (including the checksum) to be transmitted thereafter is written into the buffer memory.

  For example, when the received command packet represents a command to drive any of the above-described driving targets, the lens CPU 203 writes all “0” dummy data in the above-described buffer memory. When the received command packet represents a command to transmit lens information (for example, the model name of the interchangeable lens 200), the lens CPU 203 displays data indicating the requested lens information (for example, the model name of the interchangeable lens 200). Character string data) and checksum are written into the buffer memory. Here, the lens information written in the buffer memory is transmitted to the camera body 100 by full-duplex communication behind the communication of the data portion of command data communication to be described later.

  On the other hand, the body-side first communication circuit 112 also causes the body CPU 103 to generate a transmission / reception completion interrupt in response to the completion of the transmission / reception of the command packet. In response to this interrupt, the body CPU 103 writes a data packet corresponding to the content of the transmitted command packet into a buffer memory provided in the body-side first communication circuit 112. For example, when the transmitted command packet represents a command to drive any of the above-described driving targets, the body CPU 103 writes data representing the driving amount and driving direction of the driving target in the above-described buffer memory. If the transmitted command packet represents a command to transmit the model name of the interchangeable lens 200, the body CPU 103 writes all “0” dummy data in the buffer memory. Here, the lens information prepared in the buffer memory is transmitted to the camera body 100 by full-duplex communication behind the communication of the data portion of command data communication to be described later.

  Next, the body CPU 103 sends a transmission start signal to the body-side first communication circuit 112. However, since the signal level of the signal line RDY is H at this time (time T2 in FIG. 4), the body-side first communication circuit 112 does not start sending the data packet signal.

  When the first control process 404 is completed, the lens CPU 203 sends a transmission permission signal to the lens-side first communication circuit 212. The lens side first communication circuit 212 to which the transmission permission signal is input changes the signal level of the signal line RDY from H to L (time T3 in FIG. 4). As a result, the body-side first communication circuit 112 starts sending the clock signal 405 and the data packet signal 406 in the same manner as the command packet. Here, the data packet signal 406 is a serial signal representing a data packet written in the buffer memory by the body CPU 103. The lens side first communication circuit 212 also starts to send out the data packet signal 407 in response to the clock signal 405. Here, the data packet signal 407 is a serial signal representing a data packet written in the buffer memory by the lens CPU 203.

  When the transmission / reception of the data packet is completed, as in the case of the command packet, the lens-side first communication circuit 212 sets the signal level of the signal line RDY to H and causes the lens CPU 203 to generate a transmission / reception completion interrupt (FIG. 4). Time T4). In response to this interruption, the lens CPU 203 starts executing the second control process 408. The second control process 408 is a process for performing various controls based on the received data packet. In the second control process 408, the lens CPU 203 reads the data packet received from the buffer memory in the lens-side first communication circuit 212 and writes it in the main memory (not shown). Then, appropriate control is performed based on the previously received command packet and the currently received data packet. That is, the lens CPU 203 executes a control process based on the control data in response to the control data being received by the lens-side first communication circuit 212.

  For example, when the received command packet represents an instruction to drive any of the above-described driving targets, the lens CPU 203 drives the driving target based on the movement amount and the movement direction represented by the data packet. When the received command packet represents a command to transmit lens information (for example, the model name of the interchangeable lens 200), the lens CPU 203 performs data packet consistency check processing using a checksum included in the data packet. Then, a process of deleting a received packet from the reception buffer for the next communication is performed.

  On the other hand, in response to the completion of the transmission / reception of the data packet, the body side first communication circuit 112 also causes the body CPU 103 to generate a transmission / reception completion interrupt. In response to this interrupt, the body CPU 103 executes processing according to the content of the transmitted command packet, if necessary. For example, when the transmitted command packet represents a command to drive any of the above-described driving targets, the body CPU 103 does nothing. When the transmitted command packet represents a command for transmitting lens information (for example, the model name of the interchangeable lens 200), the body CPU 103 writes the model name in a main memory (not shown) or a portable storage medium. Or write to 106.

(Description of hotline communication)
In hot line communication, the lens-side second communication circuit 213 sends a data signal unilaterally in synchronization with the clock signal output from the body-side second communication circuit 113. That is, the hot line communication is one-way data communication in which data is transmitted from the interchangeable lens 200 to the camera body 100.

  When performing hotline communication, the lens CPU 203 executes a generation process for generating lens data representing the operating state of the interchangeable lens 200. The lens data of this embodiment is 5-byte data representing the position change amount of the focus lens 210d.

  FIG. 5 is a waveform diagram showing hotline communication. FIG. 5B is an enlarged view of one period Tx in FIG. Hot line communication is started by the body CPU 103 in the same manner as command data communication. First, the body CPU 103 sends a communication start signal to the body-side second communication circuit 113. The body-side second communication circuit 113 to which the communication start signal is input changes the signal level of the signal line HREQ from H to L (time T6 in FIG. 5B).

  The lens-side second communication circuit 213 causes the lens CPU 203 to generate a communication request interrupt in response to the signal level of the signal line HREQ changing from H to L. Receiving this interruption, the lens CPU 203 starts executing a generation process 501 for generating lens data. In the generation process 501, the lens CPU 203 obtains the position change amount of the focus lens 210d from the time when the previous hotline communication is completed, and writes it in the buffer memory inside the lens-side second communication circuit 213.

  The lens CPU 203 outputs a transmission instruction signal to the lens-side second communication circuit 213 at the end of the generation process 501. That is, the generation process 501 includes a process of outputting a transmission instruction signal. The transmission instruction signal is a signal representing a transmission instruction of the generated lens data. The lens-side second communication circuit 213 to which the transmission instruction signal is input changes the signal level of the signal line HANS from H to L (time T7 in FIG. 5B).

  The body-side second communication circuit 113 starts sending the clock signal 502 in response to the signal level of the signal line HANS changing from H to L. The clock signal 502 is sent to the signal line HCLK. As described above, in the present embodiment, the lens data is 5-byte data. Therefore, the clock signal 502 has a length of 5 bytes.

  The lens side second communication circuit 213 sends the lens data signal 503 to the signal line HDATAT in synchronization with the clock signal 502 sent by the body side second communication circuit 113. A lens data signal 503 is a 5-byte serial signal representing lens data. That is, the lens side second communication circuit 213 transmits the lens data to the body side second communication circuit 113 in the camera body 100 via the second transmission path 302 in response to the lens data generated by the lens CPU 203. To do.

  The body-side second communication circuit 113 receives the lens data signal 503 sent to the signal line HDATAT, and writes the data represented by this signal in the buffer memory inside the body-side second communication circuit 113. Transmission / reception of lens data is performed by the body-side second communication circuit 113 and the lens-side second communication circuit 213. That is, the body CPU 103 and the lens CPU 203 can execute other processes during transmission / reception of lens data.

  When the exchange of lens data is completed, the second lens-side communication circuit 213 sets the signal level of the signal line HANS to H (time T8 in FIG. 5B). The body-side second communication circuit 113 causes the body CPU 103 to generate a communication completion interrupt. In response to this interruption, the body CPU 103 reads the lens data received from the buffer memory inside the body-side second communication circuit 113. Thereafter, the body CPU 103 sends a communication completion signal to the body-side second communication circuit 113. The body-side second communication circuit 113 that has received the communication completion signal sets the signal level of the signal line HREQ to H.

  The body CPU 103 executes the hotline communication described above at predetermined intervals Tn (for example, every 1 to several milliseconds) shown in FIG. That is, the lens CPU 203 executes the generation process at every predetermined interval Tn. Thus, the body CPU 103 always holds the latest lens data. The body CPU 103 performs control such as automatic focus adjustment using the lens data.

(Explanation of priority of hotline communication)
Command data communication and hotline communication are independent of each other. That is, command data communication and hot line communication can be performed simultaneously. However, the lens CPU 203 in the interchangeable lens 200 cannot execute two processes simultaneously. Therefore, a first control process and a second control process (hereinafter, these two processes are called control processes) that are processes necessary for command data communication, and a generation process that is a process necessary for hotline communication. And cannot be executed at the same time.

  The lens CPU 203 of this embodiment gives priority to the generation process when the control process and the generation process occur simultaneously. Hereinafter, the case where the control process and the generation process occur simultaneously will be described with two specific examples.

  FIG. 6 is a waveform diagram when the generation process occurs during the execution of the control process. In FIG. 6, command data communication is first started at time T10. Specifically, the body side first communication circuit 112 sends a clock signal 601 and a command packet signal 602, and the lens side first communication circuit 212 sends a command packet signal 603.

  Thereafter, at time T11, the exchange of the command packet signal 602 and the command packet signal 603 is completed, and the lens CPU 203 starts the first control process 604 (for example, a process for preparing the requested lens information). However, in FIG. 6, the body-side second communication circuit 113 changes the signal level of the signal line HREQ from H to L at time T12 when the first control processing 604 is being executed. That is, during the execution of the first control process 604, the body CPU 103 sends a communication start signal to the body-side second communication circuit 113. As a result, a generation process 605 (for example, a process for generating position information of the focus lens 210d) occurs at time T12 when the first control process 604 is being executed.

  In such a case, the lens CPU 203 temporarily interrupts the first control process 604 and starts executing the generation process 605 at time T12. Then, at the time T <b> 13 when the generation process 605 is completed, the execution of the temporarily interrupted first control process 604 is resumed. As a result of the completion of the generation process 605, the lens-side second communication circuit 213 changes the signal level of the signal line HANS from H to L at time T13. In response to this, the sending of the clock signal 607 by the body-side second communication circuit 113 and the sending of the lens data signal 608 by the lens-side second communication circuit 213 are started. Thereafter, transmission of the lens data signal 608 is completed at time T15, and hotline communication is completed at time T16.

  On the other hand, in command data communication, as the first control processing 604 is completed at time T14, the body side first communication circuit 112 sends the clock signal 609 and the data packet signal 610, and the lens side first communication circuit 212. The transmission of the data packet signal 611 is started. As described above, since the first transmission path 301 and the second transmission path 302 are independent from each other, communication using these two transmission paths is performed in parallel from time T14 to time T15. Thereafter, the lens CPU 203 starts the second control process 612 at time T17, and the command data communication is completed at time T18.

  Thus, the lens CPU 203 temporarily interrupts the control process when the generation process is started during the execution of the control process. The lens CPU 203 further suspends the control process and then restarts the control process when the generation process is completed. As a result, the generation processing by the lens CPU 203 and the transmission of lens data by the lens-side second communication circuit 213 have priority over the control processing by the lens CPU 203 and the transmission / reception of control data by the lens-side first communication circuit 212.

  FIG. 7 is a waveform diagram when a control process occurs during the execution of the generation process. In FIG. 7, first, command data communication is started at time T19. Specifically, the body side first communication circuit 112 sends a clock signal 701 and a command packet signal 702, and the lens side first communication circuit 212 sends a command packet signal 703.

  In FIG. 7, the body-side second communication circuit 113 changes the signal level of the signal line HREQ from H to L at time T20 when these three signals are being transmitted. That is, during the transmission of these three signals, the body CPU 103 transmits a communication start signal to the body-side second communication circuit 113. As a result, the lens CPU 203 starts the generation process 605 at time T20.

  Thereafter, at time T21, the exchange of the command packet signal 602 and the command packet signal 603 is completed. That is, the first control process 705 occurs. However, at time T21, the lens CPU 203 is executing the generation process 704. In this embodiment, the lens CPU 203 does not start the first control process 705 in such a case. Instead, the lens CPU 203 starts the first control process 705 at time T22 when the generation process 704 is completed. Thereby, the time at which the first control process 705 is completed becomes a time T23 later than the original time. Accordingly, the subsequent transmission of the clock signal 708 and the data packet signal 709 by the body-side first communication circuit 112, the transmission of the data packet signal 710 by the lens-side first communication circuit 212, and the execution of the second control processing 711 by the lens CPU 203, Slower than expected. That is, the time required for command data communication is longer than when the first control process 705 and the generation process 704 do not occur simultaneously.

  On the other hand, hotline communication proceeds in the same manner as in the case shown in FIG. That is, the transmission of the clock signal 706 and the lens data signal 707 is started at time T22 when the generation process 704 is completed, and the transmission of these signals is completed at time T24. Then, the hot line communication is completed at time T25. The time from time T20 to time T25 is the same length as the time from time T6 to time T9 shown in FIG.

  As described above, the lens CPU 203 does not start the control process during the generation process. Thereafter, the lens CPU 203 starts the control process when the generation process is completed. As a result, the generation processing by the lens CPU 203 and the transmission of lens data by the lens-side second communication circuit 213 have priority over the control processing by the lens CPU 203 and the transmission / reception of control data by the lens-side first communication circuit 212.

(When the interchangeable lens is a manual focus lens)
The case where the interchangeable lens is a manual focus lens will be described below. In the following description, regarding the interchangeable lens 800 that is a manual focus lens, the same components as those of the interchangeable lens 200 that is an autofocus lens are denoted by the same reference numerals, and detailed description thereof is omitted. In the following description, differences from the above description will be mainly described. FIG. 8 is a cross-sectional view illustrating a configuration of the camera system 1 according to the present embodiment in which the interchangeable lens 800 is attached to the camera body 100. The interchangeable lens 800 includes an imaging optical system 210 including a plurality of lenses 210a to 210e and an aperture 210f.

  Of these lenses, for example, the lens 210d is a focus lens that is driven for focus adjustment. The lens 210e is a blur correction lens. In accordance with an instruction from the body CPU 103, the lens CPU 203 drives the blur correction lens 210e, the diaphragm 210f, and the like by an actuator (not shown). The interchangeable lens 800 is provided with a focus ring (not shown) that is manually operated by the user, instead of the actuator that drives the focus lens 210d. The user performs focusing by operating the focus ring (not shown).

  FIG. 9 is a block diagram illustrating details of a transmission path between the camera body 100 and the interchangeable lens 800. The lens-side second communication circuit 213 includes a communication terminal OHANS. The body-side second communication circuit 113 includes four communication terminals OHREQ, IHANS, OHCLK, and IHDATAL. The second transmission path 302 includes four signal lines HREQ, HANS, HCLK, and HDATAL. Note that the interchangeable lens 800 is provided with only the signal line HANS among the four signal lines HREQ, HANS, HCLK, and HDATAL.

  As described above, the interchangeable lens 800 is provided with the contacts 310L and 320L. The contact 310L includes interchangeable lens side contacts (lens side contacts) 311L, 312L, 313L, and 314L for the first transmission path 301. In the interchangeable lens 800, three signal lines HREQ, HCLK, and HDATAL among the four signal lines of the second transmission path 302 do not exist, but the contact 320L has four body side contacts 321B, All lens side contacts 321L, 322L, 323L, and 324L corresponding to 322B, 323B, and 324B are provided. Therefore, the interchangeable lens 200, which is an autofocus lens, and the contact parts can be shared, and the cost can be reduced. Further, the feeling when the interchangeable lens 800 is attached to the camera body 100 and the contact with the body side contacts 321B, 322B, 323B, 324B and the like hardly change from the interchangeable lens 200, and the contacts 310B, 320B and the contacts 310L, There are advantages that the contact state with 320L is stable and the stability of communication is obtained. Furthermore, it contributes to the future use of the lens side contacts 321L, 323L, and 324L that are not currently used.

  The lens side second communication circuit 213 outputs a signal indicating that it is a manual focus lens. That is, the lens side second communication circuit 213 always sets the signal level of the signal line HANS to L. Thereby, the following control is performed on the camera body 100 side.

  When the interchangeable lens 800 is attached to the camera body 100, as described above, the body CPU 103 detects that the signal level of the signal line RDY has changed from the high impedance state to H or L in the body-side first communication circuit 112. . As described above, the body CPU 103 determines whether the signal level of the signal line HANS detected by the body-side second communication circuit 113 is H or L. When the interchangeable lens 800 is attached to the camera body 100, since the signal level of the signal line HANS is always L as described above, the body CPU 103 has the interchangeable lens 800 that is a manual focus lens attached to the camera body 100. Judge that it is attached. Therefore, for example, when determining whether the interchangeable lens attached to the camera body 100 is an autofocus lens or a manual focus lens, it is quicker than the case where data is received from the interchangeable lens side by command data communication. Is possible.

  When it is determined that the interchangeable lens 800, which is a manual focus lens, is attached to the camera body 100, the body CPU 103 removes communication of data necessary for calculation related to driving of the focus lens 210d, and the interchangeable lens 200 is attached to the camera body 100. The body-side first communication circuit 112 is controlled so as to perform various types of communication similar to when the is attached. The body CPU 103 does not perform hotline communication related to the acquisition of lens data as described above. In addition, the body CPU 103 executes various calculations similar to those performed when the interchangeable lens 200 is attached to the camera body 100, except for calculations related to driving of the focus lens 210d.

According to the camera system according to the above-described embodiment, the following operational effects can be obtained.
(1) The lens CPU 203 gives priority to a generation process for generating lens data to be transmitted via the second transmission path 302 over a predetermined control process based on the control data received via the first transmission path 301. Since it did in this way, even if it is a case where the control process and control process for controlling each of the 1st transmission path 301 and the 2nd transmission path 302 occur simultaneously, it can communicate normally.

(2) When the generation process is started during the execution of the control process, the lens CPU 203 temporarily interrupts the control process. Since it did in this way, lens data can be transmitted to camera body 100 without delay.

(3) After temporarily interrupting the control process, the lens CPU 203 restarts the control process when the generation process is completed. As described above, the command data communication does not fail even though the generation process is preferentially executed.

(4) The lens CPU 203 does not start the control process during the generation process. Since it did in this way, lens data can be transmitted to camera body 100 by hot line communication without delay.

(5) The control data is composed of a plurality of partial data, and the lens CPU 203 executes a control process based on the partial data every time the partial data is received by the lens-side first communication circuit 212. Since it did in this way, control processing becomes small and the idle time of lens CPU203 can be utilized more effectively.

(6) The interchangeable lens 800 is configured such that the signal level of the signal line HANS is always L. Since it did in this way, for example, compared with the case where data is received from the interchangeable lens side by command data communication when determining whether the interchangeable lens attached to the camera body 100 is an autofocus lens or a manual focus lens. A quick decision is possible.

(7) In the interchangeable lens 800, all the lens side contacts 321L, 322L corresponding to the four body side contacts 321B, 322B, 323B, 324B, including the lens side contacts related to the signal lines that do not exist in the manual focus lens. 323L and 324L are provided. Since it did in this way, the interchangeable lens 200 which is an autofocus lens and the part of a contact can be made common, and cost can be reduced. Further, the feeling when the interchangeable lens 800 is attached to the camera body 100 and the contact with the body side contacts 321B, 322B, 323B, 324B and the like hardly change from the interchangeable lens 200, and the contacts 310B, 320B and the contacts 310L, There are advantages that the contact state with 320L is stable and the stability of communication is obtained. Furthermore, even when the lens side contacts 321L, 323L, and 324L that are not currently used are used in the future, it is not necessary to change the design around the contacts or change the components of the contacts 310L and 320L.

(8) When it is determined that the interchangeable lens 800, which is a manual focus lens, is attached to the camera body 100, computation related to driving the focus lens 210d and data communication are not performed. Since it did in this way, useless calculation and communication can be omitted and it is efficient.

  The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.

(Modification 1)
Command data communication may not be full-duplex communication. The present invention can be applied as long as at least control data can be transmitted from the camera body 100 to the interchangeable lens 200.

(Modification 2)
Control data transmitted in command data communication may be divided into more than two partial data, or may not be divided into a plurality of partial data. Further, the length of the control data may be different from that described in the above embodiment. For example, the control data may be variable length.

(Modification 3)
The command from the body CPU 103 to the lens CPU 203 represented by the command packet may be other than that described in the above embodiment. For example, it may be a command for driving a member other than the focus lens 210d (for example, a zoom lens, a shake correction lens, a diaphragm, etc.), or information other than the model name of the interchangeable lens 200 (for example, focal length information (zoom position information)). Or aperture position information, lens characteristic information (optical aberration information), etc.) may be transmitted. Further, the contents of the first control process and the second control process may be different from those of the above-described embodiment.

(Modification 4)
The configuration of the first transmission path 301 and the second transmission path 302 is not limited to the configuration shown in FIG. For example, signal lines other than the signal lines shown in FIG. 3 may exist. Further, the communication procedure of command data communication and hot line communication may be different from the procedure shown in FIGS.

(Modification 5)
Data that the interchangeable lens 200 transmits to the camera body 100 in the hotline communication is not limited to the position information of the focus lens 210d. For example, aperture position information and image stabilization lens position information may be transmitted. In this case, any one of these pieces of information may be transmitted, or a plurality of pieces of information may be transmitted as a set.

(Modification 6)
In the interchangeable lens 800, the lens-side second communication circuit 213 is configured so that the signal level of the signal line HANS is always L, but the configuration is not limited thereto. For example, the signal line HANS may be simply dropped to the ground level without providing the lens side second communication circuit 213.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

100 camera body 103 body CPU
112 Body side first communication circuit 113 Body side second communication circuit 200 Interchangeable lens 203 Lens CPU
212 Lens-side first communication circuit 213 Lens-side second communication circuit 301 First transmission path 302 Second transmission path

Claims (2)

When transmitting / receiving various signals to / from an autofocus interchangeable lens, a drive command signal related to driving the focus lens of the autofocus interchangeable lens is transmitted via the first transmission path, and the position of the focus lens Is received through a second transmission path different from the first transmission path, and the drive command signal is generated based on the lens data, and the second transmission path is the lens. A first body-side signal line for transmitting a signal for requesting the start of communication related to data transmission, and a second for receiving from the autofocus interchangeable lens a signal indicating that communication preparation is completed A body side signal line; and a third body side signal line for receiving the lens data from the autofocus interchangeable lens, A first body side contact connected to one body side signal line, a second body side contact connected to the second body side signal line, and a third body side signal line. a said manual focus type interchangeable lens to the camera body detachably mounted and a third body side contact,
A first lens side contact that is electrically connected to the first body side contact when attached to the camera body;
A second lens side contact that is electrically connected to the second body side contact when attached to the camera body;
A third lens side contact that is electrically connected to the third body side contact when attached to the camera body;
Manual, characterized in that it comprises the identification signal output means for the interchangeable lens mounted on the camera body is output through the second lens side contact a signal indicating that the interchangeable lens of the manual focusing type, Focus type interchangeable lens. A camera system having a camera body and an interchangeable lens removably attached to the camera body,
The camera body is
A body-side transmitting and receiving means for transmitting and receiving various signals to and from the auto-focus type exchange lens,
A second body-side transmission path which is different from the first body-side transmission line and the first body-side transmission line for the body-side transmitting and receiving means to transmit and receive various signals to and from said auto-focus type of the interchangeable lens,
Determining means for determining whether the interchangeable lens attached to the camera body is the autofocus interchangeable lens;
Drive command signal generating means for generating a drive command signal related to driving of the focus lens of the autofocus type interchangeable lens,
The body side transmission / reception means, when the determination means determines that the interchangeable lens attached to the camera body is the autofocus interchangeable lens, at least the drive generated by the drive command signal generation means A command signal is transmitted through the first transmission line on the body side,
The body side transmission / reception means starts communication related to transmission of lens data related to the position of the focus lens when the determination means determines that the interchangeable lens attached to the camera body is the autofocus interchangeable lens. and transmits to the auto-focus type of the interchangeable lens a signal requesting through the body-side second transmission path, the second body-side transmission path the lens data sent from the auto-focus type of the interchangeable lens Received through
The drive command signal generating means generates the drive command signal based on the lens data received by the body side transmitting / receiving means via the body side second transmission path,
The body-side second transmission line, the lens and the first body-side signal line for transmitting a signal requesting start of communication according to the transmission of data, said signal indicating that the communication is ready autofocusing A second body side signal line for receiving from the interchangeable lens, and a third body side signal line for receiving the lens data from the interchangeable lens,
A first body-side contact connected to the first body-side signal line;
A second body side contact connected to the second body side signal line;
A third body side contact connected to the third body side signal line,
Said determination means receives a signal indicating that the second body-side signal line interchangeable lens mounted on the camera body from the interchangeable lens through is interchangeable lens manual focus type, the camera body attached interchangeable lens is determined to be an interchangeable lens of the manual focusing type, the second interchangeable lens mounted from the interchangeable lens through the body-side signal line to the camera body of the manual focusing type If not receiving a signal indicating that the interchangeable lens, it is determined that the camera interchangeable lens mounted on the body which is the auto-focus type of the interchangeable lens,
The interchangeable lens is
A first lens side contact that is electrically connected to the first body side contact when attached to the camera body;
A second lens side contact that is electrically connected to the second body side contact when attached to the camera body;
A third lens-side contact that is electrically connected to the third body-side contact when attached to the camera body;
The interchangeable lens, the if the manual is a focus type of the interchangeable lens, the second lens side contact a signal indicating that the interchangeable lens mounted on the camera body is an interchangeable lens of the manual focusing type The camera system further comprising an identification signal output means for outputting via a camera.

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