JP2017151161A - Accessory and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accessory strong in noise occurring in data communication and an imaging device.SOLUTION: An accessory detachably attached to an imaging device comprises: a first contact point and a second contact point for connecting with two respective contact points of the imaging device; and a transmission unit for transmitting information to identify a function of a contact point of the imaging device connected with the second contact point to the imaging device via the first contact point.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an accessory and an imaging apparatus.

  Conventionally, an accessory shoe in which a camera accessory such as a flash device is detachable is known (see, for example, Patent Document 1). In the apparatus described in Patent Document 1, sufficient consideration has not been given to an appropriate arrangement of electrical contacts for performing data communication.

JP 2008-180914 A

According to the first aspect of the present invention, the accessory attachable to and detachable from the imaging device includes a first contact and a second contact connected to each of the two contacts of the imaging device, and the first contact through the first contact. A transmitter that transmits information specifying the function of the contact point of the imaging device connected to the two contact points to the imaging device.
According to the second aspect of the present invention, an imaging device to which an accessory can be attached and detached includes a first contact and a second contact that are respectively connected to two contacts of the accessory, and the accessory from the accessory via the first contact. A receiving unit that receives information specifying the function of the second contact.

Explanatory drawing of the lens-interchangeable camera system which concerns on 1st Embodiment A perspective view showing a camera body, a first interchangeable lens, and a first accessory A perspective view showing a camera body, a first interchangeable lens, and a first accessory Top view of shoe seat and connector Block diagram schematically showing the configuration of the camera body and the first accessory Timing chart of data communication performed between body control unit and accessory control unit Timing chart of data communication performed between body control unit and accessory control unit Explanatory drawing which shows the operation | movement sequence of a camera body and a 1st accessory. Explanatory drawing which shows the operation | movement sequence of a camera body and a 1st accessory. Block diagram schematically showing the configuration of the camera body and the second accessory Block diagram schematically showing the configuration of the camera body and the third accessory Block diagram schematically showing the configuration of the camera body and the fourth accessory Block diagram schematically showing the configuration of the camera body and the fifth accessory Block diagram schematically showing the configuration of the camera body and the sixth accessory The top view which shows the modification of the arrangement | sequence of an electrical contact

(First embodiment)
FIG. 1 is an explanatory diagram of a lens-interchangeable camera system according to the first embodiment. The camera system 1 includes a camera body 100, a first interchangeable lens 200a, a second interchangeable lens 200b, a first accessory 300a, a second accessory 300b, a third accessory 300c, a fourth accessory 300d, and a fifth. Accessory 300e.

  In the following description, various interchangeable lenses including the first interchangeable lens 200a and the second interchangeable lens 200b are collectively referred to as the interchangeable lens 200, and the first accessory 300a, the second accessory 300b, the third accessory 300c, Various accessories including the fourth accessory 300d and the fifth accessory 300e are collectively referred to as an accessory 300.

  A user of the camera system 1 can use the camera body 100 with an optional interchangeable lens 200 attached thereto. The user of the camera system 1 can select an optional accessory 300 and use it by attaching it to the camera body 100.

  The first accessory 300a is an EVF (electronic viewfinder) unit. The second accessory 300b is a flash device. The third accessory 300c is a GPS (Global Positioning System) receiver. The fourth accessory 300d is an auxiliary imaging device. The fifth accessory 300e is an EVF unit incorporating a flash device. Each of these accessories will be described in detail later.

  2 and 3 are perspective views showing the camera body 100, the first interchangeable lens 200a, and the first accessory 300a. Since the configuration of the second interchangeable lens 200b is the same as the configuration of the first interchangeable lens 200a, description thereof is omitted.

  A body-side mount portion 101 to which the first interchangeable lens 200a is detachably attached is provided on the housing front surface 10 of the camera body 100. The first interchangeable lens 200a is provided with a lens side mount portion 201 corresponding to the body side mount portion 101 and detachably attached to the camera body 100.

  An imaging element 102 such as a CMOS or CCD is provided behind the body side mount 101 in the camera body 100. A release switch 103 is provided on the housing upper surface 20 of the camera body 100. Various buttons 104 are provided on the housing rear surface 30 of the camera body 100. The user inputs a shooting instruction, a shooting condition setting instruction, or the like to the camera body 100 using an input device such as the release switch 103 or the button 104.

  A rear monitor 105 is provided on the housing rear surface 30 of the camera body 100. The back monitor 105 is a display device using a liquid crystal display, for example. The rear monitor 105 performs, for example, live view display of a subject image, menu display of shooting settings, and the like.

  On the housing upper surface 20 of the camera body 100, an accessory shoe (hereinafter referred to as a shoe seat 106) to which the first accessory 300a is detachably attached is provided. The first accessory 300 a is provided with a connector 301 corresponding to the shoe seat 106 and detachably attached to the camera body 100. The connector 301 can be attached to and detached from the shoe seat 106 of the camera body 100.

  The first accessory 300a provides a so-called electronic viewfinder function. A finder window 302 is provided on the back surface 40 of the first accessory 300a. A liquid crystal panel 303 is provided inside the first accessory 300a. The user can view the video displayed on the liquid crystal panel 303 by looking through the finder window 302.

  A proximity sensor 316 is provided in the vicinity of the finder window 302. The proximity sensor 316 detects that the user's face is close to the finder window 302, that is, the user is looking into the finder window 302. The detection result of the proximity sensor 316 is used to determine which of the liquid crystal panel 303 and the rear monitor 105 is to perform live view display or the like.

  When the first accessory 300a is attached to the camera body 100, a screen normally displayed on the rear monitor 105 can be displayed on the liquid crystal panel 303 of the first accessory 300a. For example, a so-called live view or menu screen is normally displayed on the rear monitor 105, but can be displayed on the liquid crystal panel 303 of the first accessory 300a. The rear monitor 105 and the liquid crystal panel 303 can be used exclusively, or both can be used simultaneously.

  4A is a plan view of the shoe seat 106 viewed from the Y axis positive direction, and FIG. 4B is a plan view of the shoe seat 106 viewed from the insertion direction of the connector 301 (Z axis positive direction). 4C is a plan view of the connector 301 viewed from the negative Y-axis direction, and FIG. 4D is a plan view of the connector 301 viewed from the shoe seat 106 direction (Z-axis positive direction). FIG.

  As shown in FIGS. 4C and 4D, 24 electrical contacts PA <b> 1 to PA <b> 24 are arranged in a row in the X-axis direction along the end 12 of the lower surface 13 on the lower surface 13 of the connector 301. It is provided side by side. A connector 301 can be inserted and fixed to the shoe seat 106. “Attaching the accessory 300 to the camera body 100” indicates that the connector 301 is inserted and fixed to the shoe seat 106.

  As shown in FIG. 4A, four electrical contacts PSB1 to PSB4 are provided at the center of the upper surface 11 of the shoe seat 106. As shown in FIG. At the end portion 10 of the upper surface 11 of the shoe seat 106, 24 electrical contacts PB1 to PB24 are provided along the end portion 10 in a line in the X-axis direction.

  When the first accessory 300a is attached to the camera body 100, each of the 24 electrical contacts PA1 to PA24 provided on the lower surface 13 of the connector 301 and the 24 electrical contacts PB1 to PB1 provided on the upper surface 11 of the shoe seat 106 are mounted. Each PB 24 is in physical contact with each other. Thereby, each of 24 electrical contacts PA1-PA24 and each of 24 electrical contacts PB1-PB24 are electrically connected.

  The connector 301 of the first accessory 300a is not provided with electrical contacts corresponding to the four electrical contacts PSB1 to PSB4. Even if the first accessory 300a is attached to the camera body 100, the four electrical contacts PSB1 to PSB4 are not electrically connected to the first accessory 300a. The first accessory 300a does not input / output electrical signals to / from the camera body 100 via the four electrical contacts PSB1 to PSB4.

  Of the 24 electrical contacts PB1 to PB24 provided on the camera body 100, the electrical contacts PB1 to PB5 are referred to as communication contacts PB1 to PB5 (including electrical contacts PB2 to PB4 for performing data communication). Similarly, of the 24 electrical contacts PA1 to PA24 provided in the first accessory 300a, the electrical contacts PA1 to PA5 are replaced with communication contacts PA1 to PA5 (including electrical contacts PA2 to PA4 for performing data communication). Called.

  Of the 24 electrical contacts PB1 to PB24 provided on the camera body 100, the electrical contacts PB9 to PB23 are referred to as image contacts PB9 to PB23. Similarly, among the 24 electrical contacts PA1 to PA24 provided in the first accessory 300a, the electrical contacts PA9 to PA23 are referred to as image contacts PA9 to PA23.

  FIG. 5 is a block diagram schematically showing the configuration of the camera body 100 and the first accessory 300a. The camera body 100 includes a body control unit 110 and a signal switching unit 111. The body control unit 110 controls the entire camera body 100 by reading and executing a control program stored in advance in a ROM (not shown).

  The body control unit 110 includes an image output unit 110a and an image input unit 110b. The signal switching unit 111 connects one of the image output unit 110a and the image input unit 110b to the image contacts PB9 to PB23 according to the type of the accessory 300 attached to the camera body 100.

  Although details will be described later, the accessory 300 has a function of inputting an image signal (for example, a first accessory 300a) and a function of outputting an image signal (for example, a fourth accessory 300d to be described later). Exists. When the accessory 300 having a function of inputting an image signal is attached, the signal switching unit 111 connects the image output unit 110a to the image contacts PB9 to PB23. When the accessory 300 having a function of outputting an image signal is attached, the signal switching unit 111 connects the image input unit 110b to the image contacts PB9 to PB23.

  The first accessory 300a illustrated in FIG. 5 has an electronic viewfinder function, that is, a function of inputting an image signal. Therefore, the signal switching unit 111 connects the image output unit 110a to the image contacts PB9 to PB23. The body control unit 110 creates a display image signal by performing various image processing on the image pickup signal output from the image pickup element 102 (FIG. 2). The image output unit 110 a outputs the display image signal to the accessory 300. The image signal output by the image output unit 110a is transmitted to the accessory 300 via the signal switching unit 111 and the image contacts PB9 to PB23. The image input unit 110b will be described in detail later.

  The first accessory 300a includes an accessory control unit 310, a signal conversion unit 313, a liquid crystal panel 303, and a proximity sensor 316. The accessory control unit 310 controls the entire first accessory 300a by reading and executing a control program stored in advance in a ROM (not shown). The signal conversion unit 313 converts the image signal output from the image output unit 110 a described above into an image signal suitable for the liquid crystal panel 303. For example, an image signal in a predetermined signal format is input from the camera body 100 to the signal conversion unit 313 via the image contacts PA9 to PA23. The signal conversion unit 313 converts the input image signal into an image signal of a different signal format corresponding to the liquid crystal panel 303. The signal conversion unit 313 inputs the converted image signal to the liquid crystal panel 303. The liquid crystal panel 303 displays an image (so-called through image) based on the input video signal.

  A proximity sensor 316 is connected to the accessory control unit 310. When the proximity sensor 316 detects that the user's face is close to the viewfinder window 302, the proximity sensor 316 outputs a predetermined interrupt signal to the accessory control unit 310.

  The electrical contact illustrated in FIG. 5 will be described. Communication contacts PA1 to PA5 and PB1 to PB5 are contacts for performing data communication between the body control unit 110 and the accessory control unit 310. Image contacts PA9 to PA23 and PB9 to PB23 are contacts for transmitting and receiving image signals between the body control unit 110 and the accessory control unit 310.

  Of the image contacts PA9 to PA23 and PB9 to PB23, the electrical contacts PA11 / PB11, PA14 / PB14, PA17 / PB17, and PA21 / PB21 are grounded. The electrical contacts PA18 / PB18 are unused electrical contacts. Therefore, the electrical contacts that actually transmit and receive image signals are the electrical contacts PA9 / PB9, PA10 / PB10, PA12 / PB12, PA13 / PB13, PA15 / PB15, PA16 / PB16, PA19 / PB19, PA20 / PB20, PA22 / There are a total of 10 electrical contacts PB22 and PA23 / PB23.

  The electrical contacts PA7 / PB7 are contacts for supplying operating power (for example, 3.3 V) from the camera body 100 to the first accessory 300a. The electrical contact PA24 / PB24 is a contact for the camera body 100 to detect the attachment / detachment of the first accessory 300a. For example, the electrical contact PB24 is pulled up to a predetermined voltage, and the electrical contact PA24 is grounded. In this way, the voltage level of the electrical contact PB24 changes between when the first accessory 300a is attached and when it is not attached. The body control unit 110 detects whether or not the first accessory 300a is attached by referring to the voltage level of the electrical contact PB24. Specifically, since a pull-up resistor is connected to the electrical contact PB24, the voltage level of the electrical contact PB24 is high when the first accessory 300a is not attached. When the body control unit 110 detects that the voltage level of the potential contact PB24 is high, the body control unit 110 recognizes that the accessory is not attached. Further, since the electrical contact PA24 is installed, the voltage level of the electrical contact PA24 is at a low level. Therefore, when the first accessory 300a is attached, the body control unit 110 detects that the voltage level of the electrical contact PA24 is low and recognizes that the first accessory 300a is attached.

  The electrical contacts PSB1 to PSB4 are electrical contacts that are not used in the first accessory 300a, and thus the description thereof is omitted here.

  6 and 7 are timing charts of data communication performed between the body control unit 110 and the accessory control unit 310. FIG. FIG. 6 is a timing chart when data communication is started by the body control unit 110, and FIG. 7 is a timing chart when start of data communication is requested by the accessory control unit 310.

  A communication sequence when data communication is started by the body control unit 110 will be described with reference to FIG. When there is no communication, the signal levels of the communication contacts PA1 to PA5 and PB1 to PB5 are all set to a high level (H level). When the body control unit 110 starts data communication, the body control unit 110 outputs a low level (L level) first signal to the electrical contacts PA1 and PB1 (time t1). This first signal means the start of data communication by the body control unit 110.

  The accessory control unit 310 recognizes that data communication has been started from the body control unit 110 based on the first signal output to the electrical contacts PA1 and PB1. When the accessory control unit 310 is ready to perform data communication, the accessory control unit 310 outputs an L-level second signal to the electrical contacts PA5 and PB5 in response to this request (time t2). This second signal means a response that the data communication by the accessory control unit 310 can be started.

  In response to the second signal, the body control unit 110 outputs a clock signal to the electrical contacts PA4 and PB4 and outputs a data signal synchronized with the clock signal to the electrical contacts PA3 and PB3 (time t3 to t4). ). The body control unit 110 outputs command data including a command portion and a data portion as a data signal. The command portion is data having a predetermined length (for example, 8 bytes), and the data portion is data having a predetermined length (for example, 8 bytes). The command portion represents some instruction for the accessory control unit 310. The data portion represents specific contents (numerical values or setting values) designated by the command portion.

  When the reception of the command portion is completed, the accessory control unit 310 outputs an H level third signal to the electrical contacts PA5 and PB5 (time t5). This third signal means that the accessory control unit 310 is preparing a response of the instruction content in the command portion. The body control unit 110 stands by without performing further data communication (the data part) while the electrical contacts PA5 and PB5 are at the H level.

  When the accessory control unit 310 completes the analysis of the command part and the preparation of data to be transmitted (returned) to the body control unit 110 is completed, the accessory control unit 310 outputs the fourth signal at the L level to the electrical contacts PA5 and PB5. (Time t6). This fourth signal means a response that the accessory control unit 310 can start data communication.

  In response to the fourth signal, the body control unit 110 outputs a clock signal to the electrical contacts PA4 and PB4, and outputs a data signal (the data portion) synchronized with the clock signal to the electrical contacts PA3 and PB3. (Time t7 to t8). At this time, the accessory control unit 310 outputs a data signal synchronized with the clock signal to the electrical contacts PA2 and PB2. That is, full-duplex data communication is performed between the body control unit 110 and the accessory control unit 310 from time t7 to t8. The size of data transmitted and received at this time is determined based on the command portion transmitted from the body control unit 110 to the accessory control unit 310 at times t3 to t4.

  When the transmission / reception of data is completed, the accessory control unit 310 outputs an H-level fifth signal to the electrical contacts PA5 and PB5 (time t9). This fifth signal means a notification that the communication by the accessory control unit 310 has been completed. The body control unit 110 recognizes that the data communication is normally completed based on the fifth signal output to the electrical contacts PA5 and PB5. In response to the fifth signal, the body control unit 110 outputs an H-level sixth signal to the electrical contacts PA1 and PB1 (time t10). Thereby, the data communication for one time is completed, and the signal levels of the communication contacts PA1 to PA5 and PB1 to PB5 are restored to those at the time of no communication.

  As described above, the accessory control unit 310 switches the level of the signal output from the electrical contact PA5 from the L level to the H level when the level of the signal input from the electrical contact PA1 continues to the L level, and L Control back to level.

  With reference to FIG. 7, a communication sequence when data communication is started by accessory control unit 310 will be described. When starting the data communication, the accessory control unit 310 outputs a low level (L level) seventh signal to the electrical contacts PA5 and PB5 (time t11). The seventh signal means a signal that requests the accessory control unit 310 to start data communication.

  The body control unit 110 recognizes that the start of data communication is requested from the accessory control unit 310 based on the seventh signal output to the electrical contacts PA5 and PB5. When the body control unit 110 is ready to perform data communication, the body control unit 110 outputs an L-level eighth signal to the electrical contacts PA1 and PB1 in response to this request (time t12). The eighth signal means a response that the body control unit 110 can start data communication. That is, the signal output to the electrical contacts PA5 and PB5 by the accessory control unit 310 is a signal that prompts the camera body 100 to output signals to the electrical contacts PA1 and PB1.

  The body control unit 110 outputs a clock signal to the electrical contacts PA4 and PB4 after a predetermined time from the output of the eighth signal (time t13 to t14). The accessory control unit 310 outputs a data signal representing command data to the electrical contacts PA2 and PB2 in synchronization with the clock signal. The command data transmitted here represents some instruction or notification to the body control unit 110.

  When the transmission of the command data is completed, the accessory control unit 310 outputs an H-level ninth signal to the electrical contacts PA5 and PB5 (time t15). This signal means that the accessory control unit 310 is preparing data to be subsequently transmitted. The body control unit 110 stands by without performing further data communication while the electrical contacts PA5 and PB5 are at the H level.

  When the accessory control unit 310 completes the data preparation, the accessory control unit 310 outputs an L-level tenth signal to the electrical contacts PA5 and PB5 (time t16). This tenth signal means a response that the accessory control unit 310 can start data communication.

  In response to the tenth signal, the body controller 110 outputs a clock signal to the electrical contacts PA4 and PB4 and outputs a data signal synchronized with the clock signal to the electrical contacts PA3 and PB3 (time t17 to t18). ). At this time, the accessory control unit 310 outputs a data signal synchronized with the clock signal to the electrical contacts PA2 and PB2. That is, full-duplex data communication is performed between the body control unit 110 and the accessory control unit 310 from time t17 to t18. The size of data transmitted and received at this time is determined based on command data transmitted by the accessory control unit 310 at times t13 to t14.

  When the transmission / reception of data is completed, the accessory control unit 310 outputs the eleventh signal at the H level to the electrical contacts PA5 and PB5 (time t19). The eleventh signal means a notification that the communication by the accessory control unit 310 has been completed. The body control unit 110 recognizes that the data communication is normally completed based on the eleventh signal output to the electrical contacts PA5 and PB5. In response to the eleventh signal, the body control unit 110 outputs an H level twelfth signal to the electrical contacts PA1 and PB1 (time t20). Thereby, the data communication for one time is completed, and the signal levels of the communication contacts PA1 to PA5 and PB1 to PB5 are restored to those at the time of no communication.

  Next, the arrangement of the electrical contacts illustrated in FIGS. 4C and 4D will be described with reference to the characteristics of the signals illustrated in FIGS.

  Communication contacts PA1 to PA5 are arranged at the right end of the electrical contacts PA1 to PA24 arranged in a line. In the communication contacts PA1 to PA5, electrical contacts PA2 to PA4 for data communication are arranged between the electrical contacts PA1 and PA5. Such an arrangement is used for the following reason. First, the electrical contacts PA2 to PA4 for data communication are electrical contacts through which high-frequency signals flow. On the other hand, the electrical contacts PA1 and PA5 are electrical contacts used for data communication handshaking. For this reason, a signal having a lower frequency than the signals flowing through the electrical contacts PA2 to PA4 flows through the electrical contacts PA1 and PA5 (see FIGS. 6 and 7). In other words, the signals flowing through the electrical contacts PA1 and PA5 are more resistant to noise than the signals flowing through the data communication electrical contacts PA2 to PA4. In order to suppress the possibility that a high-frequency signal flowing through the electrical contacts PA2 to PA4 becomes a noise source for other electrical contacts (for example, electrical contacts PA9, PA10...), The electrical contacts PA2 to PA2 are interposed between the electrical contacts PA1 and PA5. PA4 is arranged. Thereby, the crosstalk of the signal which flows through electrical contacts PA2-PA4 and the signal which flows through electrical contacts other than communication contacts PA1-PA5 can be suppressed. Conversely, crosstalk between signals flowing through electrical contacts other than the communication contacts PA1 to PA5 and signals flowing through the electrical contacts PA2 to PA4 can also be suppressed.

  4C and 4D, the electrical contact PA4 is disposed on the right side of the electrical contact PA5. Here, the electrical contact PA4 is an electrical contact from which a clock signal is output from the body control unit 110 to the accessory control unit 310. The electrical contact PA4 is arranged next to the electrical contact PA5 in this way because the clock signal flowing through the electrical contact PA4 protects a reference signal from crosstalk with other electrical contacts when performing data communication. It is. As described above, since a signal resistant to noise flows through the electrical contact PA5, a signal characteristic that flows through the electrical contact PA5 is used to make a position adjacent to the electrical contact PA5 where the crosstalk is relatively difficult to occur. An electrical contact PA4 is arranged.

  The electrical contact PA2 is disposed next to the electrical contact PA1. A signal from the accessory control unit 310 toward the body control unit 110 flows through the electrical contact PA2. As described above, various accessories 300 are attached to the camera body 100, and their electrical characteristics vary depending on the accessories 300. Therefore, the signal flowing through the electrical contact PA2 may be an electrically undesirable signal such as a signal having a large overshoot or undershoot. As described above, since a signal resistant to noise flows through the electrical contact PA1, a signal characteristic that flows through the electrical contact PA1 is used to make a position adjacent to the electrical contact PA1 where the crosstalk is relatively difficult to occur. An electrical contact PA2 is arranged.

  Further, as described above, since an electrically undesirable signal may flow through the electrical contact PA2, the electrical contact PA2 is separated from the electrical contact PA4 in order to reduce the possibility of affecting the reference clock signal. It is desirable that they are arranged at distant positions.

  The electrical contact PA3 is arranged next to the electrical contact PA4. A data signal from the body control unit 110 flows through the electrical contact PA3, and a clock signal from the body control unit 110 flows through the electrical contact PA4. That is, the signal flowing through the electrical contact PA3 and the signal flowing through the electrical contact PA4 are completely synchronized. For this reason, even if it arrange | positions adjacently, possibility that an adverse effect will be low is low. On the other hand, the data signal flowing through the electrical contact PA2 is a signal output from the accessory control unit 310, and there is a possibility that a slight deviation occurs between the data signal and the clock signal. That is, by disposing the electrical contact PA3 next to the electrical contact PA4, it is possible to reduce the possibility that the clock signal will be adversely affected or that the clock signal may be adversely affected.

  As illustrated in FIG. 4A, the electrical contact PB1 and the electrical contact PB24 are shorter in the insertion direction of the connector 301 than the other electrical contacts PB2 to PB23. In other words, the electrical contacts PB2 to PB23 protrude in a direction intersecting (orthogonal) with respect to the direction in which the electrical contacts PB1 and the detection contact PB24 are arranged in a line. This is to prevent malfunctions when the connector 301 is inserted. Further, since the electrical contact PA and electrical contact PA24 of the accessory 300 and the electrical contact PB1 and electrical contact PB24 of the camera body 100 are arranged at both ends, the accessory 300 is inserted from a direction inclined obliquely from the orthogonal direction. Since the communication is not started when the connection state between the electrical contacts at both ends is inappropriate, the communication is always possible under the stable connection state between the electrical contacts.

  When the connector 301 is inserted, the end 10 of the shoe seat 106 and the end 12 of the connector 301 may not necessarily be parallel. For example, the connector 301 may be inserted with a slight angle due to a dimensional shift between the connector 301 and the shoe seat 106, a force applied to the connector 301, or the like. In this case, the timing at which the electrical contacts PB1 to PB24 are electrically connected to the electrical contacts PA1 to PA24 is different for each electrical contact.

  In the present embodiment, since the length of the electrical contact PB1 and the electrical contact PB24 in the insertion direction of the connector 301 is shorter than the other electrical contacts PB2 to PB23, the electrical contact to be connected last is It is always the electrical contact PB1 or the electrical contact PB24.

  Since the electrical contact PB24 is a contact for detecting attachment / detachment, the body control unit 110 does not recognize the attachment of the accessory 300 until the electrical contact PB24 is connected. If the body control unit 110 does not recognize the attachment of the accessory 300, the body control unit 110 does not start data communication with the accessory 300, and no malfunction occurs.

The electrical contact PB1 is an electrical contact through which a signal notifying the start of communication from the body control unit 110 to the accessory control unit 310 flows. Even if the body control unit 110 tries to start data communication, if the electrical contact PB1 is not connected, the communication start request does not reach the accessory control unit 310, and data communication is not started.
Therefore, in a state where at least one of the electrical contacts PB1 or PB24 is not connected, data communication with the accessory 300 is not started and no malfunction occurs.

  8 and 9 are explanatory diagrams showing an operation sequence of the camera body 100 and the first accessory 300a. The horizontal axes of FIGS. 8 and 9 indicate the passage of time from left to right. 8 and 9, the first accessory 300a is always attached to the camera body 100.

  With reference to FIG. 8, power on and display switching from the rear monitor 105 to the EVF will be described. When the user turns on the power switch of the camera body 100, the body control unit 110 starts executing the startup process (time t21). In the activation process, the body control unit 110 initializes each part of the camera body 100. When the startup process is completed, that is, when the initialization of each part of the camera body 100 is completed, the body control unit 110 gives a display start instruction to the rear monitor 105 (time t28). The rear monitor 105 starts live view display in response to the display start instruction (time t29). After that, the body control unit 110 displays the subject image on the rear monitor 105 in real time by repeatedly performing imaging of the subject image by the imaging element 102 and creation of image data for display.

  During initialization of each part of the camera body 100, the body control unit 110 refers to the voltage level of the electrical contact PB24 and detects that any accessory 300 is attached. The body control unit 110 that has detected that the accessory 300 is attached starts supplying operating power from the electrical contact PB7 to the accessory 300 (time t22). With this supply of operating power, the accessory control unit 310 starts executing the startup process. In the activation process, the accessory control unit 310 instructs each unit of the first accessory 300a, such as the signal conversion unit 313, the proximity sensor 316, and the liquid crystal panel 303, to execute the initialization process (time t23). The body control unit 110 starts initial communication with the accessory 300 when a certain time has elapsed after the supply of operating power is started (time t24).

  In the initial communication, the body control unit 110 transmits command data indicating the initial communication to the accessory control unit 310. With this command data, data indicating various information of the first accessory 300a is transmitted from the accessory control unit 310 to the body control unit 110. The various information of the camera body 100 first accessory 300a includes, for example, information indicating that the first accessory 300a has a function of inputting an image signal, and indicates the type of the first accessory 300a (for example, EVF, GPS, etc.). Information). Camera body 100 The camera body 100 body control unit 110 connects the image output unit 110a and the image contacts PB9 to PB23 to the signal switching unit 111 based on the information of the first accessory 300a obtained here. As a result, a plurality of (10 in the present embodiment) electrical signal lines shown in the image output unit are connected to the corresponding image contacts PB9 to PB23.

  That is, the functions of the image contacts PB9 to PB23 of the camera body 100 connected to the image contacts PA9 to PA23 are specified by the information transmitted from the first accessory 300a to the camera body 100. In other words, in the first accessory 300a, the information for specifying the functions of the image contacts PB9 to PB23 of the camera body 100 connected to the image contacts PA9 to PA23 is that the electrical contacts PA9 to PA23 are image signals from the camera body 100. Is information specifying the function of being an electrical contact that outputs.

  After the initial communication, the accessory control unit 310 transmits a state notification command to the camera body 100 (time t25). The initialization state of each part of the first accessory 300a is notified to the body controller 110 by a flag accompanying the state notification command. For example, in each part of the first accessory 300a, flag 1 is set if initialization is completed, and flag 0 is set if initialization is not completed. Each part of the first accessory 300a is, for example, the proximity sensor 316 or the signal conversion unit 313. When the initialization state is notified for the first time, the initialization of each part of the first accessory 300a is not completed (that is, the flag of each part is set to 0). The body control unit 110 recognizes from the state notification command that the initialization of the first accessory 300a has not been completed, and thus the first accessory 300a cannot yet display an image. The accessory control unit 310 transmits a state notification command to the camera body 100 every time the initialization state changes, that is, every time initialization of each unit is completed. For example, in FIG. 8, it is notified that the initialization of the proximity sensor 316 is completed at time t26 (a flag corresponding to the proximity sensor 316 is set to 1), and the initialization of the signal conversion unit 313 is performed at time t27. The completion is notified (the flags corresponding to the proximity sensor 316 and the signal conversion unit 313 are set to 1). In this way, upon receiving a status notification command in which all the flags are set to 1 (in this embodiment, a status notification command notified at time t27 in FIG. 8), the camera control unit 110 receives the first accessory 300a. Recognize that all parts have been initialized.

  The body control unit 110 transmits a viewfinder display setting command to the accessory control unit 310 while the initialization process of the first accessory 300a is being performed. In accordance with the display setting command, for example, the brightness setting value of the liquid crystal panel 303 is transmitted to the accessory control unit 310. These display settings may be transmitted to the first accessory 300a even if the initialization of each part of the first accessory 300a is not completed because the accessory control unit 310 only needs to store the setting values. it can.

  After the above-described status notification command notifies that the initialization process of the first accessory 300a has been completed, the EVF function of the first accessory 300a can be used. For example, when the proximity sensor 316 detects the proximity of the user, the proximity sensor 316 notifies the accessory control unit 310 of the proximity of the user, and the accessory control unit 310 indicates that the proximity of the user is detected to the body control unit 110. Is notified (time t30). In response to this notification, the body control unit 110 starts executing the display switching process from the rear monitor 105 to the EVF.

  The image output unit 110a starts outputting an image signal (image data) corresponding to the accessory control unit 310 (time t31). The image data output here is not actual display image data but dummy image data. The dummy image data is image data filled with black, for example. The signal conversion unit 313 executes display preparation processing in response to the start of image data output, and starts outputting Vsync (Vertical Synchronizing signal) to the liquid crystal panel 303. The body control unit 110 transmits an EVF display command to the accessory control unit 310 (time t32). The EVF display command includes a flag (on flag, off flag) for switching on and off of the liquid crystal panel 303 of the first accessory 300a, and a set value (for example, 60 fps or 50 fps) of the display frame rate of the liquid crystal panel 303. . The body control unit 110 gives a turn-off instruction to the rear monitor 105 before and after the transmission of the EVF display command (time t33). The display on the rear monitor 105 is turned off by this turn-off instruction (time t34). The accessory control unit 310 performs processing such as setting of a display frame rate for the signal conversion unit 313 and the liquid crystal panel 303 and lighting of the liquid crystal panel 303 in accordance with an EVF display command (including the on flag). When display of the through image on the EVF is started, the accessory control unit 310 transmits an EVF display start notification command to the body control unit 110 to notify that display on the EVF has started (time t35). The body control unit 110 stops outputting the image signal to the rear monitor 105 in response to this notification.

  With reference to FIG. 9, display switching from EVF to rear monitor 105 and power-off will be described. When the proximity sensor 316 detects that the user who has been close has moved away from the EVF (time t40), display switching from the EVF to the rear monitor 105 is performed by the same procedure as described above. That is, when the proximity sensor 316 notifies the accessory control unit 310 that the user has left the EVF, the accessory control unit 310 detects that the user has left the EVF to the body control unit 110. To that effect (time t40). In response to this notification, the body control unit 110 starts executing the display switching process from the EVF to the rear monitor 105.

  The body control unit 110 starts outputting the image signal to the rear monitor 105 (time t41). The image signal output here is not actual display image data but dummy image data. The body control unit 110 gives a display start instruction to the rear monitor 105 before and after the output of the image signal. The rear monitor 105 executes display start processing in response to this instruction. The body control unit 110 transmits an EVF display command to the accessory control unit 310 (time t42). In response to the EVF display command (including the off flag), the accessory control unit 310 performs processing such as turning off the liquid crystal panel 303 and stopping the conversion processing in the signal conversion unit 313 (time t43). When the EVF is turned off, the accessory control unit 310 transmits a notification indicating that the EVF display is turned off to the body control unit 110 (time t44). In response to this notification, the body control unit 110 gives a display instruction to the rear monitor 105 and starts outputting display image data to the rear monitor 105 (time t45). The rear monitor 105 starts displaying a through image in response to this instruction (time t46). Thereafter, the image output unit 110a stops outputting the image signal to the first accessory 300a at a predetermined timing (time t47).

  When the user turns on the power switch of the camera body 100, the body control unit 110 starts executing the power-off process (time t48). In the power-off process, the body control unit 110 stops the operation of each unit of the camera body 100. For example, the body control unit 110 gives a display off instruction to the rear monitor 105. In response to this instruction, the rear monitor 105 turns off the display screen and stops displaying the through image (time t49).

  The body control unit 110 transmits a power off command to the first accessory 300a during execution of the power off process (time t49). When the accessory control unit 310 receives the power-off command, the accessory control unit 310 sequentially turns off each unit of the first accessory 300a. The body control unit 110 does not stop supplying the operating power to the first accessory 300a until a time t50 when a predetermined time elapses after the power-off command is transmitted. The accessory control unit 310 performs necessary termination processing during the predetermined time. When the power-off process is completed, the body control unit 110 stops supplying the operating power to the first accessory 300a and stops its own operation (time t50).

  Next, EVF frame rate setting switching processing will be described. For example, when 50 fps moving image shooting is started or when a moving image shot at 50 fps is played back, it is desirable to set the EVF display frame rate to 50 fps. When the above operation is started when a through image is displayed at 60 fps, it is necessary to switch the EVF display frame rate from 60 fps to 50 fps. The frame rate setting switching process is a process of switching the EVF display frame rate in this way.

  In the frame rate setting switching process, the body control unit 110 first transmits an EVF display command. The command part of the EVF display command transmits a command related to EVF display from the body control unit 110. The data portion of the EVF display command alternatively includes a flag for turning on the EVF display and a flag for turning off the EVF display, and includes a frame rate flag for displaying the EVF next. In response to the flag for turning off the EVF display in the data portion of the EVF display command, the accessory control unit 310 turns off the display of the EVF. The accessory control unit 310 initializes the signal conversion unit 313 when the EVF display is turned off. When the initialization of the signal conversion unit 313 is completed, the accessory control unit sets the frame rate to be displayed next on the EVF according to the frame rate flag in the data portion of the EVF display command. Then, the accessory control unit 310 notifies the body control unit 110 of a notification indicating that the initialization of the signal conversion unit 313 has been completed.

In response to the notification indicating that the initialization is completed from the accessory control unit 310, the body control unit 110 transmits an EVF display command and starts transmitting image data. At this time, the image data is output at the above frame rate. The accessory control unit 310 turns on the EVF display according to the flag for turning on the EVF display in the data portion of the EVF display command. As the EVF display is turned on, the accessory control unit 310 displays the received image data on the EVF at the frame rate set after the initialization. When the display of the through image on the EVF is started, the accessory control unit notifies the body control unit 110 that the display of the EVF has started.
The above is the frame rate setting switching process for EVF display.

  FIG. 10 is a block diagram schematically showing the configuration of the camera body 100 and the second accessory 300b. The second accessory 300b is a flash device, and emits photographing auxiliary light to the subject. As shown in FIG. 10, the connector 301b of the second accessory 300b is provided with electrical contacts PSA1 to PSA4 corresponding to the electrical contacts PSB1 to PSB4 provided on the camera body 100. The electrical contacts PA1 to PA24 provided in the first accessory 300a are not provided in the connector 301b of the second accessory 300b.

  The second accessory 300b includes a light emitting unit 317. The light emitting unit 317 receives power necessary for light emission from the camera body 100 via the electrical contacts PSA1 to PSA4. When a light emission timing is instructed from the camera body 100 via the electrical contacts PSA1 to PSA4, the light emitting unit 317 emits photographing auxiliary light to the subject.

  FIG. 11 is a block diagram schematically showing the configuration of the camera body 100 and the third accessory 300c. The third accessory 300c is a GPS (Global Positioning System) receiver. Similarly to the first accessory 300a, the electrical contacts PA1 to PA24 are provided on the connector 301c of the third accessory 300c, and the electrical contacts PSA1 to PSA4 that the second accessory 300b has are not provided.

  The third accessory 300c includes an accessory control unit 310c and a GPS module 318. The GPS module 318 receives a distance measurement radio wave from an artificial satellite, calculates position information (for example, latitude and longitude), and transmits the calculated position information to the accessory control unit 310c. The accessory information unit 310 transmits the position information received from the GPS module 318 to the body control unit 110 by data communication via the communication contacts PA1 to PA5.

  The third accessory 300c does not have a function of transmitting / receiving an image signal. Therefore, none of the image contacts PA9 to PA23 of the third accessory 300c is connected to an electric circuit in the third accessory 300c. That is, the third accessory 300c does not use the image contacts PA9 to PA23. In addition, in the initial communication with the third accessory 300c, the body control unit 110 recognizes that the third accessory 300c is a GPS, and recognizes that the electrical contacts PB9 to PB23 are electrical contacts that do not function (use). To do.

  FIG. 12 is a block diagram schematically showing the configuration of the camera body 100 and the fourth accessory 300d. The fourth accessory 300d is an auxiliary imaging device. The fourth accessory 300d includes an accessory control unit 310d and a camera module 319. The camera module 319 includes an imaging optical system and an imaging device, captures a subject image, and outputs an image signal. That is, the fourth accessory 300d is an external camera unit.

  The body control unit 110 receives data indicating various pieces of information of the fourth accessory 300d through initial communication. The various pieces of information of the fourth accessory 300d include information indicating that the fourth accessory 300d has a function of outputting an image signal, for example. The body control unit 110 connects the image input unit 110b and the image contacts PB9 to PB23 to the signal switching unit 111 based on the information of the fourth accessory 300d obtained here. As a result, a plurality of (10 in the present embodiment) electrical signal lines shown in the image input section are connected to the corresponding image contacts PB9 to PB23.

  That is, the functions of the image contacts PB9 to PB23 of the camera body 100 connected to the image contacts PA9 to PA23 are specified by the information transmitted from the fourth accessory 300d to the camera body 100 in the initial communication. In other words, in the fourth accessory 300d, the information specifying the functions of the image contacts PB9 to PB23 of the camera body 100 connected to the image contacts PA9 to PA23 is that the electrical contacts PA9 to PA23 are image signals from the camera body 100. Is information that specifies the function of being an electrical contact for inputting.

  The camera module 319 outputs an image signal to the signal switching unit 111 via the image contacts PA8 to PA23. The signal switching unit 111 outputs this image signal to the image input unit 110b. The image input unit 110b displays the image signal on the rear monitor 105, for example, or stores it in a storage medium (not shown).

  FIG. 13 is a block diagram schematically showing the configuration of the camera body 100 and the fifth accessory 300e. The fifth accessory 300e is an EVF unit incorporating a flash device. That is, the fifth accessory 300e is an accessory that has both the function of the first accessory 300a and the function of the second accessory 300b described above, and each part that the first accessory 300a had and the second accessory 300b. Each part. The connector 301e of the fifth accessory 300e is provided with electrical contacts PA1 to PA24 and electrical contacts PSA1 to PSA4. Since the configuration of each part and the operation of each part are the same as those of the first accessory 300a and the second accessory 300b described above, description thereof will be omitted.

According to the embodiment described above, the following operational effects can be obtained.
(1) For example, the first accessory 300a is provided with a plurality of electrical contacts PA1 to PA24 arranged in a line. The plurality of electrical contacts PA1 to PA24 are an electrical contact PA1 that inputs a first signal indicating the start of communication with the camera body 100 from the camera body 100, and a second signal that prompts the camera body 100 to output the first signal. Between the electrical contact PA1 and the electrical contact PA5, and the electrical contact PA5 for outputting data to the camera body 100 and the communication contacts PA2 to PA4 for data communication with the camera body 100. Communication contacts PA2 to PA4 are arranged. Since it did in this way, the accessory strong against the noise which arises at the time of data communication can be provided.

(2) The communication contacts PA2 to PA4 include data communication contacts PA2 and PA3 for exchanging data with the camera body 100, and a clock signal contact PA4 input at a predetermined cycle. The signal contact PA4 is disposed at a position closer to the electrical contact PA5 than the data communication contacts PA2 and PA3. Since it did in this way, possibility that a bad influence will arise between a data signal and a clock signal can be lowered.

(3) The data communication contacts PA2 and PA3 include an input contact PA3 for inputting a data signal output from the camera body 100 and an output contact PA2 for outputting a data signal to the camera body 100. The contact PA3 is disposed closer to the electrical contact PA5 than the output contact PA2. Since it did in this way, possibility that a data signal will exert a bad influence on a clock signal, or a bad influence from a clock signal can be reduced.

(4) When not communicating with the camera body 100, the signal input to the electrical contact PA1 and the signal output to the electrical contact PA5 are at the H level, and when communicating, input to the electrical contact PA1. The signal and the signal output to the electrical contact PA5 are at L level. The first accessory 300a includes an accessory control unit 310 that controls the level of the signal output from the electrical contact PA5, and the accessory control unit 310 is configured such that when the level of the signal input from the electrical contact PA1 continues at the L level, Control is performed so that the level of the signal output from the electrical contact PA5 is switched from the L level to the H level and returned to the L level. Since it did in this way, each communication operation | movement contained in a communication sequence can be steadily advanced.

(5) The first accessory 300 a includes a detection contact PA 24 that detects attachment / detachment with the camera body 100. The electrical contact PA1, the electrical contact PA5, the communication contacts PA2 to PA4, and the detection contact PA24 are arranged in a row, and the two contacts, the electrical contact PA1 and the detection contact PA24, are arranged at both ends of the row. Since it did in this way, when it inserts from the direction which slanted from the orthogonal direction at the time of insertion of the accessory 300, or the state where a part of electrical contact is connected and the rest is not connected, it is data between the accessories 300. Communication does not start and no malfunction occurs.

(6) For example, the first accessory 300a is provided with a plurality of electrical contacts PA1 to PA24 arranged in a line. The plurality of electrical contacts PA <b> 1 to PA <b> 24 include an electrical contact PA <b> 1 that inputs a first signal indicating the start of communication with the camera body 100 from the camera body 100, a detection contact PA <b> 24 that detects attachment / detachment with the camera body 100, There are other electrical contacts PA2 to PA23 arranged in a line between the contact PA1 and the detection contact PA24, and the two contacts of the electrical contact PA1 and the detection contact PA24 are arranged at both ends of the line. . Since it did in this way, data communication with the accessory 300 should be started in a state where the connection state between the electrical contacts at both ends is inappropriate or in a state where some of the electrical contacts are connected and the rest are not connected. There is no malfunction.

(7) The ground potential is applied to the detection contact PA24 in the first accessory 300a. Since it did in this way, attachment / detachment of the 1st accessory 300a is detectable with a simple structure.

(8) The camera body 100 is an imaging device to which the accessory 300 can be attached and detached, and is provided with a plurality of electrical contacts PB1 to PB24 arranged in a line. The plurality of electrical contacts PB <b> 1 to PB <b> 24 have an electrical contact PB <b> 1 that outputs a first signal indicating the start of communication with the accessory 300 to the accessory 300, and a second signal that requests that the accessory 300 output the first signal. The communication contacts PB2 to PB4 for performing data communication with the accessory 300 and the communication contacts PB2 to PB4 are provided between the electrical contacts PB1 and PB5. Be placed. Since it did in this way, the accessory strong against the noise which arises at the time of data communication can be provided.

(9) The plurality of electrical contacts PB1 to PB24 include a detection contact PB24 that detects attachment / detachment of the accessory 300, and other electrical contacts PB2 to PB23 between the electrical contact PB1 and the detection contact PB24. The two contacts, the contact PB1 and the detection contact PB24, are arranged at both ends of a line. Since it did in this way, data communication with the accessory 300 should be started in a state where the connection state between the electrical contacts at both ends is inappropriate or in a state where some of the electrical contacts are connected and the rest are not connected. There is no malfunction.

(10) The camera body 100 is an imaging device to which the accessory 300 can be attached and detached, and is provided with a plurality of electrical contacts PB1 to PB24 arranged in a line. The plurality of electrical contacts PB1 to PB24 output an electrical contact PB1 that outputs a first signal indicating the start of communication with the accessory 300 to the accessory 300, a detection contact PB24 that detects attachment / detachment of the accessory 300, and an electrical contact PB1. Other electrical contacts PB2 to PB23 are provided between the contact PB24, and the two contacts, the electrical contact PB1 and the detection contact PB24, are arranged at both ends of a line. Since it did in this way, data communication with the accessory 300 should be started in a state where the connection state between the electrical contacts at both ends is inappropriate or in a state where some of the electrical contacts are connected and the rest are not connected. There is no malfunction.

(11) The electrical contacts PB2 to PB23 protrude in a direction orthogonal to the direction in which the electrical contacts PB1 and the detection contact PB24 are arranged in a line. Since it did in this way, a data communication is not started between the accessories 300 in the state where a part of electrical contact is connected and the rest is not connected, and a malfunction does not occur.

(12) The first accessory 300a and the fourth accessory 300d include electrical contacts PA1 to PA5 and PA9 to PA23 that connect to the electrical contacts PB1 to PB5 and PB9 to PB23 of the camera body 100, respectively. The accessory control unit 310 transmits information specifying the functions of the electrical contacts PB9 to PB23 of the camera body 100 connected to the electrical contacts PA9 to PA23 to the camera body 100 via the electrical contacts PA1 to PA5. Since it did in this way, it becomes possible to utilize the camera body 100 and the accessory 300 by various combinations.

(13) The information specifying the functions of the electrical contacts PB9 to PB23 of the camera body 100 is information specifying the function that the electrical contacts PA9 to PA23 are electrical contacts that output image signals from the camera body 100. The one accessory 300a receives an image signal from the camera body 100 via the electrical contacts PA9 to PA23. Since it did in this way, reception of the image signal from the camera body 100 can be performed suitably.

(14) The information for specifying the functions of the electrical contacts PB9 to PB23 of the camera body 100 is information for specifying the function that the electrical contacts PA9 to PA23 are electrical contacts to which an image signal is input from the camera body 100, The fourth accessory 300d transmits an image signal to the camera body 100 via the electrical contacts PA9 to PA23. Since it did in this way, transmission of the image signal to the camera body 100 can be performed suitably.

(15) The fourth accessory 300d includes a camera module 319 that captures a subject image and outputs an image signal. The fourth accessory 300d transmits the image signal output by the camera module 319 to the camera body 100 via the electrical contacts PA9 to PA23. Since it did in this way, transmission of the image signal to the camera body 100 can be performed suitably.

(16) The accessory control unit 310 selects the electrical contacts PA1 to PA1 in order to select one combination from the combinations of the functions and the electrical contacts that can be assigned to the electrical contacts PB9 to PB23 of the camera body 100. Information identifying the type of accessory 300 is transmitted via PA5. Since it did in this way, it becomes possible to utilize the camera body 100 and the accessory 300 by various combinations.

(17) The camera body 100 includes electrical contacts PB1 to PB5 and PB9 to PB23 that are connected to the electrical contacts PA1 to PA5 and PA9 to PA23 of the first accessory 300a, respectively. The body control unit 110 receives information specifying the functions of the electrical contacts PB9 to PB23 from the first accessory 300a via the electrical contacts PB1 to PB5. Since it did in this way, it becomes possible to utilize the camera body 100 and the accessory 300 by various combinations.

(18) The body control unit 110 receives information for identifying the type of the accessory 300 via the electrical contacts PB1 to PB5, and from the information, a plurality of functions that can be assigned to the plurality of electrical contacts PB9 to PB23 One combination is selected from each combination of electrical contacts. Since it did in this way, it becomes possible to utilize the camera body 100 and the accessory 300 by various combinations.

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)
The arrangement of the electrical contacts described above is an example, and a different arrangement may be used. In the arrangement of the electrical contacts PA1 to PA5, the arrangement of the electrical contacts PA2 to PA4 can be changed in any arbitrary combination. For example, the communication contacts PA1 to PA5 are connected to PA1, PA3, PA4, PA2, PA5, or PA1, PA3, PA2, PA4, PA5, or PA1, PA2, PA4, PA3, PA5, or PA1, PA4, It is also possible to arrange in order of description of PA2, PA3, PA5, or PA1, PA4, PA3, PA2, PA5.

(Modification 2)
In FIG. 4, the camera body side electrical contacts PB1 and PB24 provided on the shoe seat 106 are shorter than the other electrical contacts PB2 to PB23, but the accessory side electrical contacts PA1 and PA24 provided on the connector 301. May be shorter than the other electrical contacts PA2 to PA23. Even if it does in that way, the effect similar to the case where electrical contact PB1, PB24 by the side of a camera body is shortened will be acquired.

(Modification 3)
Instead of the proximity sensor 316, an EVF display switching switch that can be turned on and off by the user may be provided. In this case, instead of detecting the proximity or non-proximity of the user, display switching between the rear monitor 105 and the EVF is performed by detecting on / off of the switch. Further, both the proximity sensor 316 and the switch may be provided.

(Modification 4)
The body control unit 110 may ignore detection of the proximity or non-proximity of the user by the proximity sensor 316 according to the user setting. For example, when the EVF display fixing mode is set, a through image may always be displayed on the EVF regardless of the detection result by the proximity sensor 316.

(Modification 5)
The image contacts PA9 to PA23 may be used for transmission / reception of signals other than image signals. For example, in an accessory that consumes larger power than a normal accessory, a part of the image contacts PA9 to PA23 may be used to receive additional power supply. In this case, the signal switching unit 111 switches the connection between the power supply circuit that supplies additional power and the image contacts PA9 to PA23 separately from the image output unit 110a and the image input unit 110b.

  FIG. 14 shows the configuration of the camera body 100 in which the image contacts PA9 to PA23 are used for transmission / reception of signals other than image signals and the sixth accessory 300f. The camera body 100 includes a power supply circuit 112 that supplies additional operating power. The signal switching unit 111 connects any one of the power supply circuit 112, the image output unit 110a, and the image input unit 110b to the image contacts PB9 to PB23. The sixth accessory 300f includes a large power consumption unit 321 that consumes large power. The large power consumption unit 321 receives additional operating power supplied by the power supply circuit 112 via the electrical contact PA9.

  In the initial communication, the accessory control unit 310 of the sixth accessory 300f receives information for specifying the functions of the electrical contacts PB9 to PB23 of the camera body 100 connected to the electrical contacts PA9 to PA23 via the electrical contacts PA1 to PA5. Send to body 100. In the case of the sixth accessory 300f, the information that specifies the functions of the electrical contacts PB9 to PB23 of the camera body 100 is the electrical that the additional electrical power (predetermined power supply voltage) is supplied from the camera body 100 to the electrical contacts PA9 to PA23. This information identifies the function of being a contact. Upon receiving this information, the body control unit 110 of the camera body 100 causes the signal switching unit 111 to connect the power supply circuit 112 and the image contact PB9.

(Modification 6)
The signal switching unit 111 of the body control unit 110 receives information indicating the role of the electrical contacts PB9 to PB23 in the initial communication. The information indicating the role of the electrical contacts is information indicating which circuit in the camera body 100 is connected to the electrical contacts PB9 to PB23.

  In the above description, the arrangement of the electrical contacts in a line is arranged in a line in a straight line as shown in FIG. 4, but it is not limited to the arrangement in a line on the straight line. For example, as illustrated in FIG. 15A, the electrical contacts may be arranged in a line in a V shape. Further, as illustrated in FIG. 15B, the electrical contacts may be arranged in a line in a circular arc shape. Although FIG. 15 illustrates the electrical contacts on the accessory side, the same applies to the electrical contacts on the camera body side.

  In the above description, the camera system in which the interchangeable lens 200 can be attached to and detached from the camera body 100 has been described. However, the present invention is not limited to such a camera system, and the camera body may be an integrated camera body.

  Although various embodiments and modifications have been described above, the present invention is not limited to these contents. Other embodiments conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Camera system, 100 ... Camera body, 200 ... Interchangeable lens, 300 ... Accessory

Claims (11)

An accessory that can be attached to and detached from the imaging device,
A first contact and a second contact connected to each of the two contacts of the imaging device;
A transmission unit that transmits information specifying the function of the contact of the imaging device connected to the second contact to the imaging device via the first contact;
Accessories with. The accessory according to claim 1, wherein
The information specifying the function of the contact of the imaging device is information specifying the function that the second contact is a contact for outputting an image signal from the imaging device,
An accessory that receives the image signal from the imaging device via the second contact. The accessory according to claim 1, wherein
The information that specifies the function of the contact of the imaging device is information that specifies the function that the second contact is a contact to which an image signal is input from the imaging device,
An accessory that transmits the image signal to the imaging device via the second contact. The accessory according to claim 3,
An image pickup unit that picks up a subject image and outputs the image signal;
An accessory for transmitting the image signal output by the imaging unit to the imaging device via the second contact. The accessory according to claim 1, wherein
The information specifying the function of the contact of the imaging device is information specifying the function of being a contact that supplies the first power supply voltage from the imaging device via the second contact,
An accessory that receives supply of the first power supply voltage from the imaging device via the second contact. The accessory according to claim 5, wherein
An accessory further comprising a power supply voltage contact to which a second power supply voltage is supplied from the imaging device. The accessory according to claim 1, wherein
The second contact includes a plurality of contacts respectively connected to the plurality of contacts of the imaging device,
In order to select one combination from a plurality of functions that can be assigned to a plurality of contacts of the imaging device and each contact, information identifying the type of the accessory is transmitted via the first contact. accessory. The accessory according to claim 4 or claim 6 or claim 7,
A third contact for inputting a first signal indicating the start of communication with the imaging device from the imaging device;
A fourth contact that outputs a second signal that prompts the output of the first signal to the imaging device;
An accessory in which the first contact is disposed between the third contact and the fourth contact. The accessory according to claim 8,
A fifth contact for inputting a data signal output from the imaging device;
A sixth contact for inputting a clock signal at a predetermined cycle,
An accessory arranged in the order of the third contact, the first contact, the fifth contact, the sixth contact, and the fourth contact. In an imaging device with removable accessories,
A first contact and a second contact respectively connected to the two contacts of the accessory;
A receiver for receiving information specifying the function of the second contact from the accessory via the first contact;
An imaging apparatus comprising: The imaging device according to claim 10.
The second contact includes a plurality of contacts respectively connected to a plurality of contacts of the accessory,
Receiving information identifying the type of accessory via the first contact;
An imaging apparatus that selects one combination from a combination of a plurality of functions and each contact that can be assigned to the plurality of contacts from the information.

Images