Accessories

Abstract

The present invention provides an accessory capable of stable communication with a camera body. The accessory is mounted on a camera body, the camera body having a plurality of camera-side terminals, a camera-side protrusion protruding toward the center of an opening in a lens mount, and an elastic member disposed at a position corresponding to the camera-side protrusion. The accessory comprises: a first terminal that contacts a first camera-side terminal among the plurality of camera-side terminals and changes the voltage of the first camera-side terminal by contact with the first camera-side terminal; an eighth terminal that contacts a first camera-side clock terminal and receives a first clock signal used in transmitting a first data signal from the camera body to the accessory; a tenth terminal that contacts a second camera-side clock terminal and outputs a second clock signal used in transmitting a second data signal from the accessory to the camera body; and an accessory-side protrusion that is pressed toward the camera body by the elastic member. The eighth and tenth terminals are disposed at a position where the distance from the accessory-side protrusion to the accessory-side protrusion is shorter than the distance between the first terminal and the accessory-side protrusion.

Description

Technical Field

[0001] The present invention relates to accessories. Background Art

[0002] Accessories that can be removed from and attached to a camera body are known (for example, Patent Document 1). Conventionally, it has been necessary to attach an accessory to a camera body in a state where the accessory can be properly used.

[0003] Prior art literature

[0004] Patent Document 1: Japanese Patent Application Laid-Open No. 2004-117380 Summary of the Invention

[0005] According to a first technical solution, an accessory is an accessory that is mounted on a camera body, the camera body having a plurality of camera-side terminals, a camera-side protrusion that protrudes toward the center of an opening of a lens mount, and an elastic member provided at a position corresponding to the camera-side protrusion, the accessory comprising: a first terminal that contacts a first camera-side terminal among the plurality of camera-side terminals, the voltage of the first camera-side terminal being changed by contact with the first camera-side terminal; an eighth terminal that contacts a first camera-side clock terminal among the plurality of camera-side terminals, the first clock signal used for transmitting a first data signal from the camera body to the accessory being input; a tenth terminal that contacts a second camera-side clock terminal among the plurality of camera-side terminals, the second clock signal used for transmitting a second data signal from the accessory to the camera body; and an accessory-side protrusion that is pressed toward the camera body by the elastic member, the eighth terminal and the tenth terminal being arranged at a position where the distance from the accessory-side protrusion is shorter than the distance between the first terminal and the accessory-side protrusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A diagram schematically showing the configuration of a camera system.

[0007] Figure 2 This is a circuit diagram schematically showing the electrical connection between the camera body and the interchangeable lens (interchangeable lens).

[0008] Figure 3 This is a timing chart showing an example of command data communication.

[0009] Figure 4 This is a timing chart showing an example of hot line communication.

[0010] Figure 5This is a front view schematically showing the mounting (mount, adapter) surface of the camera body as viewed from the interchangeable lens side.

[0011] Figure 6 This is a front view schematically showing the mounting surface of the interchangeable lens as viewed from the camera body side.

[0012] Label Description

[0013] 1 Camera system; 2 Camera body; 3 Interchangeable lens; 21 Body-side mounting component (mount); 22 Body-side terminal retaining portion; 31 Lens-side mounting component; 32 Lens-side terminal retaining portion. DETAILED DESCRIPTION

[0014] (First embodiment)

[0015] Figure 1 1 is a diagram schematically showing the configuration of a camera system 1 according to the first embodiment. The camera system 1 includes a camera body 2 and an interchangeable lens 3 as an example of an accessory that can be detached from and attached to the camera body 2 .

[0016] The interchangeable lens 3 includes a lens-side mount 31, a lens-side terminal holder 32, a lens-side control unit 33, a lens-side communication unit 34, a lens-side storage unit 35, a photographic (imaging) optical system 36, and a drive unit 37. The lens-side mount 31 and the lens-side terminal holder 32 will be described in detail later.

[0017] The lens-side control unit 33 is composed of a microcomputer and its peripheral circuits. The lens-side communication unit 34 performs data communication with the camera body 2, which will be described later. The lens-side communication unit 34 is connected to the lens-side terminal group (described later) provided in the lens-side terminal holding unit 32 and the lens-side control unit 33. The lens-side storage unit 35 is a non-volatile storage medium. The lens-side storage unit 35 is connected to the lens-side control unit 33. The lens-side storage unit 35 pre-stores predetermined control programs to be executed by the lens-side control unit 33. The lens-side control unit 33 controls the interchangeable lens 3 by loading the control program from the lens-side storage unit 35 and executing the program.

[0018] The photographing optical system 36 forms an image of a subject (photographing object) on a photographing surface of the image sensor 27. The optical axis O of the photographing optical system 36 substantially coincides with the center positions of the lens mount 31 and the body mount 21. Figure 1The photographing optical system 36 generally includes a lens 36a, a focus lens 36b, and a lens 36c. The focus lens 36b adjusts the imaging position of the subject image. The drive unit 37 is connected to the lens-side control unit 33 and includes an actuator (not shown). The drive unit 37 drives the focus lens 36b along the optical axis (+Z direction, -Z direction) using this actuator.

[0019] The camera body 2 includes a body-side mount 21 , a body-side terminal holding portion 22 , a body-side control portion 23 , a body-side communication portion 24 , a body-side storage portion 25 , a power supply portion 26 , an imaging element 27 , and a switch 28 for detecting the state of a lock pin (described later).

[0020] The body-side control unit 23 is composed of a microcomputer and its peripheral circuits. The body-side control unit 23 performs various body controls, but in this disclosure, only the communication-related parts are described, and other functions are omitted. The body-side communication unit 24 performs data communication with the interchangeable lens 3, which will be described later. The body-side communication unit 24 is connected to the body-side terminals (described later) provided on the body-side terminal holder 22 and the body-side control unit 23. Furthermore, some of the terminals of the body-side terminal holder 22 are connected to the body-side control unit 23 as described later. The body-side storage unit 25 is a non-volatile storage medium. The body-side storage unit 25 is connected to the body-side control unit 23. Predetermined control programs executed by the body-side control unit 23 are pre-stored in the body-side storage unit 25. The body-side control unit 23 controls the camera body 2 by loading the control programs from the body-side storage unit 25 and executing them.

[0021] The power supply unit 26 includes a power source and supplies power to the camera body 2 and the interchangeable lens 3. The power supply unit 26 is connected to a body-side terminal assembly (described later) provided on the body-side terminal holder 22 and the body-side control unit 23. The imaging element 27 is a solid-state imaging element such as a CCD and / or CMOS. The imaging element 27 is connected to the body-side control unit 23, captures an image of a subject, and outputs an imaging signal. The processing of the output imaging signal is omitted.

[0022] Figure 2 This is a circuit diagram schematically illustrating the electrical connections between the camera body 2 and the interchangeable lens 3. The body-side terminal holding portion 22 includes an LDET (B) terminal, a VBAT (B) terminal, a PGND (B) terminal, a V33 (B) terminal, a GND (B) terminal, an RDY (B) terminal, a DATAB (B) terminal, a CLK (B) terminal, a DATAL (B) terminal, an HCLK (B) terminal, and an HDATA (B) terminal. These 11 body-side terminals are collectively referred to as a body-side terminal group.

[0023] The LDET (B) terminal is used to detect the attachment and removal of the interchangeable lens 3. The LDET (B) terminal is connected to the body-side control unit 23 via a resistor R2. A power source V33 supplied from the power supply unit 26 is connected between resistor R2 and the body-side control unit 23 via a resistor R1, pulling the LDET (B) terminal up.

[0024] The VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, and GND (B) terminal are power supply system terminals connected to the power supply unit 26. Figure 2 , the direction of the supplied power is indicated by an arrow. The VBAT(B) terminal is a terminal used for supplying power to the interchangeable lens 3. The drive unit 37 of the interchangeable lens 3 is driven by the power supplied via the VBAT(B) terminal. Compared with the lens-side control unit 33, the operation of the drive unit 37 requires a larger voltage and a larger current. The maximum voltage applied to the VBAT(B) terminal by the power supply unit 26 is approximately 10V. In the following description, the voltage applied to the VBAT(B) terminal by the power supply unit 26 is referred to as the drive system voltage. The PGND(B) terminal is a ground terminal corresponding to the VBAT(B) terminal.

[0025] The V33(B) terminal is used to supply power to the interchangeable lens 3. The power supplied by the power supply unit 26 via the V33(B) terminal is used to operate the lens-side control unit 33 and other components. Compared to the drive unit 37, the lens-side control unit 33 and other components operate with lower voltages and lower currents. The maximum voltage applied by the power supply unit 26 to the V33(B) terminal is approximately 3.3V. In the following description, the voltage applied by the power supply unit 26 to the V33(B) terminal is referred to as the circuit system voltage. The GND(B) terminal is the ground terminal corresponding to the V33(B) terminal.

[0026] The RDY(B) terminal is connected to the body side communication unit 24. The DATAB(B) terminal, CLK(B) terminal, DATAL(B) terminal, HCLK(B) terminal, and HDATA(B) terminal are communication system terminals connected to the body side communication unit 24. The RDY(B) terminal, DATAB(B) terminal, CLK(B) terminal, and DATAL(B) terminal are used for command data communication described later. In addition, the HCLK(B) terminal and HDATA(B) terminal are connected to the body side communication unit 24 and are used for hotline communication described later. Figure 2 Arrows indicate signal flows. The potential of the RDY(B) terminal indicates whether the interchangeable lens 3 can communicate command data. The DATAB(B) terminal outputs data signals to the interchangeable lens 3. The CLK(B) terminal outputs clock signals to the interchangeable lens 3.

[0027] The DATAL (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0028] The HCLK (B) terminal is a terminal to which a clock signal from the interchangeable lens 3 is input. The HDATA (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0029] The lens-side terminal holding portion 32 includes an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, a RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. The 11 lens-side terminals are collectively referred to as a lens-side terminal group. When the interchangeable lens 3 is attached to the camera body 2, as in Figure 2 As indicated by the dotted lines in the figure, the body-side terminals are electrically connected to the lens-side terminals. Specifically, the LDET(B) terminal is connected to the LDET(L) terminal, the VBAT(B) terminal is connected to the VBAT(L) terminal, the PGND(B) terminal is connected to the PGND(L) terminal, the V33(B) terminal is connected to the V33(L) terminal, the GND(B) terminal is connected to the GND(L) terminal, the RDY(B) terminal is connected to the RDY(L) terminal, the DATAB(B) terminal is connected to the DATAB(L) terminal, the CLK(B) terminal is connected to the CLK(L) terminal, the DATAL(B) terminal is connected to the DATAL(L) terminal, the HCLK(B) terminal is connected to the HCLK(L) terminal, and the HDATA(B) terminal is connected to the HDATA(L) terminal. The functions of the lens-side terminals are the same as those of the body-side terminals they contact, so their explanation is omitted.

[0030] The LDET (L) terminal is grounded via a resistor R3. When the LDET (L) terminal contacts LDET (B), the potential of the LDET (B) terminal is pulled down. The VBAT (L) terminal and the PGND (L) terminal are connected to the drive unit 37. A so-called bypass capacitor C1 is connected between the VBAT (L) terminal and the PGND (L) terminal. The V33 (L) terminal and the GND (L) terminal are connected to various components such as the lens-side control unit 33. A bypass capacitor C2 is connected between the V33 (L) terminal and the GND (L) terminal. The RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal are each connected to the lens-side communication unit 34.

[0031] (Description of command data communication)

[0032] Command-data communication involves the parallel transmission and reception of control instructions (commands) from the body-side control unit 23 and responses (response data) from the lens-side control unit 33, after the control instructions (commands) from the body-side control unit 23 are transmitted to the lens-side control unit 33 of the interchangeable lens 3. Command-data communication is full-duplex communication. Command-data communication is performed via the body-side communication unit 24 and the lens-side communication unit 34 using digital data communication via the RDY (B) terminal, RDY (L) terminal, DATAB (B) terminal, DATAB (L) terminal, CLK (B) terminal, CLK (L) terminal, DATAL (B) terminal, and DATAL (L) terminal.

[0033] The body-side control unit 23 transmits various control commands and control details to the interchangeable lens 3 via the body-side communication unit 24 and the lens-side communication unit 34, and receives responses from the interchangeable lens 3, thereby transmitting and receiving various information with the interchangeable lens 3. The control commands referred to herein include, for example, commands for transmitting lens information. The various information received from the interchangeable lens 3 includes, for example, information on the model (type) of the interchangeable lens 3 and information indicating optical characteristics such as the focal length of the photographic optical system 36. The various information sent to the interchangeable lens 3 includes, for example, control details such as the lens drive level and / or information on the model of the camera body 2. Furthermore, control commands also include commands for driving the focus lens 36b. The lens-side control unit 33 receives various control commands from the body-side control unit 23 via command and data communication, obtains various information from the body-side control unit 23, and transmits various information to the body-side control unit 23.

[0034] Figure 3 This is an example of a time chart showing the timing of command data communication. When command data communication begins (T1), the body-side control unit 23 first checks the signal level of the RDY(B) terminal. The signal level of the RDY(B) terminal indicates whether the lens-side control unit 33 can perform command data communication. If command data communication is not possible, the lens-side control unit 33 sets the signal level (potential) of the RDY(L) terminal to a high level (H level). If command data communication is possible, the lens-side control unit 33 sets the signal level (potential) of the RDY(L) terminal to a low level (L level) via the lens-side communication unit 34.

[0035] When command data communication starts (T1), if the signal level of the RDY(B) terminal is low (L level), the body-side control unit 23 outputs a clock signal 401 from the CLK(B) terminal via the body-side communication unit 24. That is, the body-side control unit 23 transmits the clock signal 401 to the lens-side control unit 33 via the CLK(B) terminal and the CLK(L) terminal. Figure 3The frequency of the repetition of high and low levels of the clock signal 401 is, for example, 8 MHz. The body-side control unit 23 outputs a body-side command signal 402, which serves as a control instruction, from the DATAB(B) terminal in synchronization with the clock signal 401. Specifically, the body-side control unit 23 transmits the body-side command signal 402 to the lens-side control unit 33 via the DATAB(B) terminal and the DATAB(L) terminal. Figure 3 The body-side command signal 402, indicated by the switching between the high and low levels of DATAB, is a signal indicating control instructions from the body-side control unit 23 to the lens-side control unit 33 via command data communication. For example, the body-side command signal 402 is a signal indicating model information requesting replacement of the lens 3 and / or a signal indicating an instruction to drive the focus lens 36b.

[0036] Upon receiving the body-side command signal 402 via the lens-side communication unit 34, the lens-side control unit 33 uses the error detection code (e.g., check data) included in the body-side command signal 402 to check whether there is a communication error in the body-side command signal 402. The lens-side control unit 33 then sets the signal level of the RDY (L) terminal to a high level (H level) (T2). The body-side control unit 23 does not transmit the body-side command signal 402 if the signal level of the RDY (B) terminal is high.

[0037] The lens-side control unit 33 starts the first control process 404 based on the instruction of the received body-side command signal 402 .

[0038] Upon completion of the first control process 404, the lens-side control unit 33 sets the signal level of the RDY(L) terminal to a low level (L level) via the lens-side communication unit 34 (T3). When the signal level of the RDY(B) terminal becomes low, the body-side control unit 23 outputs a clock signal 405 from the CLK(B) terminal. In other words, the body-side control unit 23 transmits the clock signal 405 to the lens-side control unit 33 via the CLK(B) terminal and the CLK(L) terminal.

[0039] Furthermore, when the signal level of the RDY (B) terminal is high, the body-side control unit 23 does not transmit or receive the body-side data signal 406 or the lens-side data signal 407 .

[0040] The body-side control unit 23 outputs a body-side data signal 406 from the DATAB(B) terminal via the body-side communication unit 24 in synchronization with the clock signal 405. Specifically, the body-side control unit 23 transmits the body-side data signal 406 to the lens-side control unit 33 via the DATAB(B) terminal and the DATAB(L) terminal. The body-side data signal 406 indicates the control parameters of the body-side command signal 402. For example, if the body-side command signal 402 instructs the focus lens 36b to be driven, the corresponding body-side data signal 406 indicates the amount of drive to be applied to the focus lens 36b. Alternatively, the body-side data signal 406 indicates information (such as camera body model information) required by the lens-side control unit 33 during command data communication.

[0041] When the clock signal 405 is input to the CLK(L) terminal, the lens-side control unit 33 outputs a lens-side data signal 407 from the DATAL(L) terminal in synchronization with the clock signal 405 . Figure 3 The lens-side data signal 407 indicated by the switching between the high and low levels of DATAL is a signal transmitted from the lens-side control unit 33 to the body-side control unit 23 via command data communication. For example, if the body-side command signal 402 is a signal indicating model information requesting interchangeable lens 3, the corresponding lens-side data signal 407 is a signal indicating model information of the interchangeable lens 3.

[0042] Upon completion of transmission of the lens-side data signal 407, the lens-side control unit 33 returns the signal level of the RDY(L) terminal to a high level (T4). Based on the instruction of the received body-side data signal 406, the lens-side control unit 33 starts a second control process 408 (described later).

[0043] Here, the first control process 404 and the second control process 408 performed by the lens-side control unit 33 will be described. For example, the case where the received body-side command signal 402 contains specific information requesting replacement of the lens 3 will be described. As the first control process 404, the lens-side control unit 33 executes a process to generate the requested information as a lens-side data signal 407. The lens-side data signal 407 generated in the first control process 404 is transmitted to the body-side control unit 23 via the lens-side communication unit 34, the DATAL (L) terminal, the DATAL (B) terminal, and the body-side communication unit 24.

[0044] For example, let's describe a case where the received body-side command signal 402 is a signal instructing the focus lens 36b to be driven. As a first control process 404, the lens-side control unit 33 performs processing to generate a signal indicating that a signal instructing the focus lens 36b to be driven has been received. The signal generated in the first control process 404 is transmitted as a lens-side data signal 407 to the body-side control unit 23 via the lens-side communication unit 34, the DATAL (L) terminal, the DATAL (B) terminal, and the body-side communication unit 24. As a second control process 408, the lens-side control unit 33 performs processing to drive the focus lens 36b by the drive amount specified by the body-side data signal 406.

[0045] When the second control process 408 is completed, the lens-side control unit 33 sets the RDY (L) terminal to a low level via the lens-side communication unit 34 ( T5 ).

[0046] The communication performed at the timings T1 to T5 is one command data communication. In one command data communication, the body-side command signal 402 and the body-side data signal 406 are transmitted by the body-side control unit 23. That is, the body-side command signal 402 and the body-side data signal 406 together constitute one piece of control data.

[0047] As described above, the lens-side control unit 33 concurrently receives control data from the body-side control unit 23 and transmits response data to the body-side communication unit 24. In other words, command data communication is a so-called full-duplex communication.

[0048] (Instructions for hotline communication)

[0049] Another communication system involves sending data in one direction from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2. This is called hotline communication. Hotline communication involves data communication between the body-side control unit 23 and the lens-side control unit 33 via the body-side communication unit 24 and the lens-side communication unit 34, using the HCLK (B) terminal, HCLK (L) terminal, HDATA (B) terminal, and HDATA (L) terminal. The body-side control unit 23 obtains information regarding the status of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 via hotline communication. Information regarding the status of the interchangeable lens 3 includes, for example, the position of the focus lens 36b and / or the position of the shake correction lens (not shown), the position of the diaphragm, and the like. The shake correction lens is a component that can be moved (driven) to include a component perpendicular to the optical axis, and the diaphragm is a component that can be moved (driven) to change the size of the opening through which the light beam passes. This hotline communication is a communication in which, when an instruction to start communication is sent from the camera body through command data communication, the lens-side control unit 33 autonomously sends lens data to the body-side control unit 23 independently of (independently of) the command data communication until an instruction to end communication is sent.

[0050] Figure 4 This is an example of a time chart showing the timing of hotline communication. Upon receiving a command to start hotline communication from the camera body's body-side control unit 23 via command data communication (T6), the lens-side control unit 33 performs generation processing 501. Generation processing 501 acquires the lens status with a sampling period of, for example, 1 millisecond and generates a lens signal 503 for hotline communication. When generation of lens signal 503 is complete (T7), the lens-side control unit 33 outputs a clock signal 502 from the HCLK(L) terminal via the lens-side communication unit 34. Specifically, clock signal 502 is transmitted to the body-side control unit 23 via the HCLK(L) and HCLK(B) terminals. Figure 4 The frequency of the repetition of high and low levels of the clock signal 502 is, for example, 8 MHz to 20 MHz. That is, the frequency of the clock signal 502 for hotline communication is approximately the same as or higher than the frequency of the clock signal 401 for command and data communication.

[0051] The lens-side control unit 33 outputs the lens signal 503 (e.g., information regarding the position of the focus lens 36b) generated in the generation process 501 from the HDATA (L) terminal via the lens-side communication unit 34 in synchronization with the clock signal 502. Specifically, the lens-side control unit 33 transmits the lens signal 503 to the body-side control unit 23 via the lens-side communication unit 34, the HDATA (L) terminal, the HDATA (B) terminal, and the body-side communication unit 24. Figure 4The lens signal 503 indicated by the switching between the high level and the low level of HDATA is a signal transmitted from the lens-side control unit 33 to the body-side control unit 23 via hotline communication. The output of the clock signal 502 and the lens signal 503 ends at timing T8.

[0052] The lens-side control unit 33 repeats the transmission of lens data by hotline communication at regular intervals (eg, 1 millisecond) until receiving an instruction to stop transmission of the lens signal 503 by command data communication.

[0053] Command data communication and hotline communication can be partially or completely executed in parallel. That is, the body-side control unit 23 and the lens-side control unit 33 can start or end hotline communication while command data communication is in progress. Furthermore, command data communication can also be started or ended while hotline communication is in progress.

[0054] As described above, hotline communication is performed independently of command communication. The lens-side control unit 33 transmits information regarding the status of the interchangeable lens 3 to the body-side control unit 23 via hotline communication, independently of command communication. This allows the body-side control unit 23 to continuously monitor the status of the interchangeable lens 3 even during command communication. This allows the body-side control unit 23 to continuously monitor the position of the focus lens 36b, enabling, for example, high-speed autofocus control. The same applies to image stabilization control and / or aperture control.

[0055] Furthermore, even while the lens-side control section 33 is performing hotline communication, the body-side control section 23 can issue various instructions to the interchangeable lens 3 through command communication at arbitrary timings.

[0056] (Description of the lens assembly mechanism)

[0057] The camera system 1 of this embodiment includes a so-called bayonet-type lens mounting mechanism. The body-side mount 21 of the camera body 2 and the lens-side mount 31 of the interchangeable lens 3 will be described below in order.

[0058] Figure 5 (a) is a diagram schematically showing the assembly parts of the camera body 2 viewed from the interchangeable lens 3 side. The camera body 2 has Figure 1 The body-side mounting member 21 and the body-side terminal retaining portion 22 are described above. The body-side mounting member 21 has an annular reference surface with a constant width. Furthermore, the body-side mounting member 21 includes a first body-side claw 29a, a second body-side claw 29b, a third body-side claw 29c, and a fourth body-side claw 29d. In the following description, these four claws are collectively referred to as the body-side claw 29.

[0059] The body side claws 29 are arranged at intervals along the circular opening of the body side assembly 21. Figure 5 As shown in (a), the first body side claw 29a is arranged at the upper right position, the second body side claw 29b is arranged at the upper left position, the third body side claw 29c is arranged at the lower left position, and the fourth body side claw 29d is arranged at the lower right position.

[0060] The first to fourth body-side claws 29a to 29d have different lengths in the circumferential direction. Specifically, the first body-side claw 29a is the longest, the third body-side claw 29c is the second longest, the fourth body-side claw 29d is the third longest, and the second body-side claw 29b is the shortest.

[0061] The body-side claw portion 29 protrudes from the body-side assembly 21 toward the center of the opening. The circumference of the opening has sections where the body-side claw portion 29 is present and sections where it is absent. In the following description, the space 40a between the first body-side claw portion 29a and the fourth body-side claw portion 29d on the circumference of the opening of the body-side assembly 21 is referred to as the first body-side plug-in portion 40a. Similarly, the space 40b between the first body-side claw portion 29a and the second body-side claw portion 29b is referred to as the second body-side plug-in portion 40b, the space 40c between the second body-side claw portion 29b and the third body-side claw portion 29c is referred to as the third body-side plug-in portion 40c, and the space 40d between the third body-side claw portion 29c and the fourth body-side claw portion 29d is referred to as the fourth body-side plug-in portion 40d. The four body-side plug-in / plug-out sections are collectively referred to as a body-side plug-in / plug-out section 40 .

[0062] A body side terminal holding portion 22 is provided inside the opening of the body side mounting part 21. The body side terminal holding portion 22 has an arc shape corresponding to the shape of the annular body side mounting part 21. The body side terminal holding portion 22 is arranged in parallel with the opening of the body side mounting part 21 at the upper part of the opening of the body side mounting part 21, preferably as shown in FIG. Figure 5 As shown in (a) of FIG. 2 , the body side terminal holding portion 22 has a plurality of body side terminals. In the body side terminal holding portion 22 , the plurality of body side terminals are arranged in a row on the inner side of the body side assembly 21 and are arranged in an arc shape. Figure 5 As shown in (a), the multiple body side terminals are arranged from the right to the leftmost side, namely HDATA (B), HCLK (B), DATAL (B), CLK (B), DATAB (B), RDY (B), GND (B), V33 (B), PGND (B), VBAT (B), and LDET (B). Each terminal of the body side terminal group is a conductive pin. The body side terminal group is pushed in the -Z direction ( Figure 1The Z direction is the direction toward the interchangeable lens 3 attached to the camera, which is the direction of the subject.

[0063] The body-side assembly 21 has a hole through which the lock pin 42 passes. The hole through which the lock pin 42 passes is located to the upper right of the fourth body-side claw 29d. That is, on the annular reference surface of the body-side assembly 21, the hole for the lock pin 42 is located within the opening of the body-side assembly 21 between the area where the fourth body-side claw 29d is located and the area where the first body-side claw 29a is located. The lock pin 42 is urged in the -Z direction ( Figure 1 ).

[0064] Figure 5 (b) is a schematic diagram of the assembly of the camera body 2 with the body-side assembly 21 removed, as viewed from the interchangeable lens 3 side. A first leaf spring 41a is provided at a position corresponding to the first body-side claw 29a (on the back side of the first body-side claw 29a). Similarly, a second leaf spring 41b is provided at a position corresponding to the second body-side claw 29b (on the back side of the second body-side claw 29b), a third leaf spring 41c is provided at a position corresponding to the third body-side claw 29c (on the back side of the third body-side claw 29c), and a fourth leaf spring 41d is provided at a position corresponding to the fourth body-side claw 29d (on the back side of the fourth body-side claw 29d). In the following description, these four leaf springs are collectively referred to as leaf spring 41. Leaf spring 41 presses the lens-side claw, described later, in the +Z direction (toward the camera body 2).

[0065] Figure 6 Schematically shows the assembly of the interchangeable lens 3 as viewed from the camera body 2. The interchangeable lens 3 has Figure 1 The lens side mounting part 31 and the lens side terminal retaining part 32 are mentioned above. The lens side mounting part 31 has an annular reference surface with a certain width. When the interchangeable lens 3 is attached to the camera body 2, the annular reference surface of the lens side mounting part 31 contacts the annular reference surface of the body side mounting part 21 mentioned above. Furthermore, the lens side mounting part 31 has a cylindrical part extending along the optical axis on its inner periphery. The lens side mounting part 31 has a first lens side claw part 39a, a second lens side claw part 39b, a third lens side claw part 39c and a fourth lens side claw part 39d spaced apart from each other along the outer periphery of its cylindrical part. In the following description, the above four claw parts are collectively referred to as the lens side claw part 39.

[0066] The lens side claw portion 39 is provided in a direction protruding from the outer periphery of the cylindrical portion of the lens side mount 31 toward the outside of the mount (in a direction radiating from the optical axis O). Figure 6As shown, the first lens-side claw 39a is located at the upper left, the second lens-side claw 39b is located at the upper right, the third lens-side claw 39c is located at the lower right, and the fourth lens-side claw 39d is located at the lower left. Behind each lens-side claw 39 (on the reference surface side of the lens-side mounting member 31), there is space for accommodating the corresponding body-side claw 29 when the interchangeable lens 3 is attached to the camera body 2.

[0067] A lens-side terminal holding portion 32 is provided inside the opening of the lens-side mount 31. The lens-side terminal holding portion 32 has an arc shape corresponding to the shape of the annular lens-side mount 31. The lens-side terminal holding portion 32 is arranged in parallel with the opening of the lens-side mount 31 at the upper portion of the lens-side mount 31, preferably as shown in FIG. Figure 6 As shown, the lens side terminal holding portion 32 is arranged in the center of the upper portion. As described above, the lens side terminal holding portion 32 has a plurality of lens side terminals. In the lens side terminal holding portion 32, the plurality of lens side terminals are arranged in a row on the inner side of the lens side mounting member 31 and are arranged in an arc shape. Figure 6 As shown, the multiple lens side terminals are arranged as 11 terminals from the right: LDET (L), VBAT (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), HDATA (L). The lens side terminal group is arranged so that the conductive contact surface faces the +Z direction ( Figure 1 The +Z direction refers to the direction in which the subject light passing through the imaging optical system 36 is directed toward the imaging element 27.

[0068] The lens side mounting member 31 has a lock pin receiving portion 43. Figure 6 As shown, the lock pin receiving portion 43 is arranged on the upper left of the fourth claw portion 39d on the lens side. In other words, the lock pin receiving portion 43 is arranged between the portion corresponding to the first claw portion 39a on the lens side and the portion corresponding to the fourth claw portion 39d on the lens side of the lens mounting member 31. The lock pin receiving portion 43 is a groove that receives the lock pin 42 when the interchangeable lens 3 is attached to the camera body 2. This groove faces the -Z direction ( Figure 1 ) and set.

[0069] When the interchangeable lens 3 is attached to the camera body 2, the plurality of body-side terminals physically contact the corresponding plurality of lens-side terminals. This contact electrically connects the plurality of body-side terminals to the plurality of lens-side terminals. In other words, the plurality of body-side terminals and the plurality of lens-side terminals are electrically conductive.

[0070] (Attachment for interchangeable lenses)

[0071] The following describes a method for attaching the interchangeable lens 3 to the camera body 2. To attach the interchangeable lens 3 to the camera body 2, first, the body-side mount 21 and the lens-side mount 31 are aligned. The first lens-side claw 39a is positioned within the first body-side insertion / removal portion 40a, the second lens-side claw 39b is positioned within the second body-side insertion / removal portion 40b, the third lens-side claw 39c is positioned within the third body-side insertion / removal portion 40c, and the fourth lens-side claw 39d is positioned within the fourth body-side insertion / removal portion 40d. Next, the first lens-side claw 39a is inserted into the first body-side insertion / removal portion 40a, the second lens-side claw 39b is inserted into the second body-side insertion / removal portion 40b, the third lens-side claw 39c is inserted into the third body-side insertion / removal portion 40c, and the fourth lens-side claw 39d is inserted into the fourth body-side insertion / removal portion 40d. At this time, the LDET (L) terminal contacts the CLK (B) terminal, the VBAT (L) terminal contacts the DATAL (B) terminal, the PGND (L) terminal contacts the HCLK (B) terminal, and the V33 (L) terminal contacts the HDATA (B) terminal.

[0072] From this state, the interchangeable lens 3 is moved along Figure 5 as well as Figure 6 The first claw 29a on the body side enters the space on the back side of the first claw 39a on the lens side, the second claw 29b on the body side enters the space on the back side of the second claw 39b on the lens side, the third claw 29c on the body side enters the space on the back side of the third claw 39c on the lens side, and the fourth claw 29d on the body side enters the space on the back side of the fourth claw 39d on the lens side. At this time, the plurality of lens side terminals come into contact with the plurality of body side terminals in sequence. In addition, instead of the interchangeable lens 3, the camera body 2 may be moved in a direction parallel to the lens body 2. Figure 5 as well as Figure 6 The attachment direction 44 is shown as rotating in the opposite direction.

[0073] When the lens-side claws 39 are inserted into the corresponding body-side insertion and removal portions 40 and rotated in the attachment direction 44, for example, the LDET (L) terminal sequentially contacts the CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, VBAT (B) terminal, and LDET (B) terminal. For example, the VBAT (L) terminal sequentially contacts the DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, and VBAT (B) terminal. For example, the PGND (L) terminal sequentially contacts the HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, and PGND (B) terminal. For example, the V33(L) terminal sequentially contacts the HDATA(B), HCLK(B), DATAL(B), CLK(B), DATAB(B), RDY(B), GND(B), and V33(B). For example, the GND(L) terminal sequentially contacts the HDATA(B), HCLK(B), DATAL(B), CLK(B), DATAB(B), RDY(B), and GND(B).

[0074] For example, the RDY (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, the DATAB (B) terminal, and the RDY (B) terminal. For example, the DATAB (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, and the DATAB (B) terminal. For example, the CLK (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, and the CLK (B) terminal. For example, the DATAL (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, and the DATAL (B) terminal. For example, the HCLK (L) terminal sequentially contacts the HDATA (B) terminal and the HCLK (B) terminal.

[0075] The interchangeable lens 3 is rotated relative to the camera body 2 by a predetermined angle to reach the attachment completion position. In the attachment completion position, the corresponding body side claws 29 and lens side claws 39 are opposite to the optical axis direction, and the lock pin 42 is pushed along Figure 1The lock pin 42 is pushed in the -Z direction and enters the lock pin receiving portion 43. When the lock pin 42 enters the lock pin receiving portion 43, the interchangeable lens 3 cannot be rotated relative to the camera body 2 for removal. In other words, when the body side claw portion 29 and the lens side claw portion 39 reach the predetermined attachment completion position, the relative position of the body side mounting part 21 and the lens side mounting part 31 is fixed. The lens side claw portion 39 is pushed to the body side ( Figure 1 Thus, each of the plurality of lens-side terminals contacts and is electrically connected to each of the corresponding plurality of body-side terminals.

[0076] In the following description, the state in which the body-side claw portion 29 and the lens-side claw portion 39 have reached the predetermined attachment completion position is referred to as the "attachment completion state." The state in which the lens-side claw portion 39 has been rotated from its insertion position into the body-side insertion / removal portion 40 to midway before reaching the attachment completion position, or the state in which the lens-side claw portion 39 has been rotated from its insertion position to midway before reaching the insertion position, is referred to as the "attachment mid-position state."

[0077] When the interchangeable lens 3 is being attached, the signal level at the LDET(B) terminal is pulled up to a high level. Upon detecting that the signal level at the LDET(B) terminal is high, the body-side control unit 23 determines that the interchangeable lens 3 is not attached. When the interchangeable lens 3 is not attached, the body-side control unit 23 prevents the power supply unit 26 from supplying power to the VBAT(B) terminal and the V33(B) terminal.

[0078] When the attachment is completed, as described above ( Figure 2 ), the signal level of the LDET (B) terminal is pulled down to a low level. When the body-side control unit 23 detects that the signal level of the LDET (B) terminal has become a low level, it determines that the interchangeable lens 3 is attached. In addition, when the attachment is completed, the lock pin 42 enters the lock pin receiving portion 43, and the switch 28 ( Figure 1 ) is turned on. When the body-side control unit 23 detects that the signal level at the LDET (B) terminal has become low and the switch 28 is turned on, it causes the power supply unit 26 to start supplying power to the V33 (B) terminal. The camera body 2 need not include the switch 28. If the switch 28 is not included, the power supply unit 26 may simply start supplying power to the V33 (B) terminal when it detects that the signal level at the LDET (B) terminal has become low.

[0079] When power begins to be supplied to the V33(B) terminal, power is supplied to the lens-side control unit 33 of the interchangeable lens 3 through the V33(L) terminal, and the lens-side control unit 33 begins operating. The lens-side control unit 33, having begun operating, permits initial communication with the body-side control unit 23 based on command data. After the lens-side control unit 33 permits initial communication, the body-side control unit 23 begins initial communication. This initial communication includes a signal from the lens-side control unit 33 requesting power to be supplied to the VBAT(L) terminal. When the signal requesting power to be supplied to the VBAT(L) terminal is transmitted from the lens-side control unit 33 to the body-side control unit 23, the body-side control unit 23 supplies power to the VBAT(B) terminal, performing initialization processing between the camera body 2 and the interchangeable lens 3. During this initialization process, information required for various operations of the camera system 1, such as shooting and / or focusing, is exchanged between the camera body 2 and the interchangeable lens 3, and the lens position of the interchangeable lens is moved to the reference position.

[0080] When the attachment is completed, if the user presses the unlock button (not shown) of the camera body, the lock pin 42 is withdrawn from the lock pin receiving portion 43. As a result, the relative position of the body side mounting part 21 and the lens side mounting part 31 can be changed. If the user presses the unlock button (not shown), the switch 28 linked to the unlock button is turned off (OFF), and the body side control unit 23 stops the power supply unit 26 from supplying power to the VBAT (B) terminal and the V33 (B) terminal. From this state, if the interchangeable lens 3 is moved along the same direction as the lens 3, Figure 5 as well as Figure 6 If the lens is rotated in the direction opposite to the attachment direction 44 shown, the plurality of lens-side terminals will contact the plurality of body-side terminals in the reverse order to that described above.

[0081] Alternatively, the power supply may be stopped independently of the unlock button operation. In this case, the body-side control unit 23 causes the power supply unit 26 to stop supplying power to the VBAT(B) and V33(B) terminals upon detecting that the LDET(L) and LDET(B) terminals have separated due to rotation of the interchangeable lens 3 in the direction opposite to the attachment direction 44 and that the signal level at the LDET(B) terminal has changed from low to high. This allows the number of components in the camera system 1 to be reduced. Alternatively, the power supply unit 26 may stop supplying power to the VBAT(B) and V33(B) terminals upon detecting both the unlock button being pressed and the signal level at the LDET(B) terminal changing from low to high. Alternatively, the body-side control unit 23 may cause the power supply unit 26 to stop supplying power to the VBAT(B) and V33(B) terminals upon detecting either the unlock button being pressed or the signal level at the LDET(B) terminal changing from low to high.

[0082] As described above, during the process of attaching or detaching an interchangeable lens from a camera body (during attachment), the lens-side terminals may come into contact with body-side terminals other than the terminals that should be in contact when attachment is complete. The arrangement of the lens-side and body-side terminals is preferably one that minimizes malfunctions (failures) caused by contact during attachment and detachment.

[0083] (Terminal arrangement considering noise)

[0084] In this embodiment, the LDET (B) terminal among the plurality of body-side terminals is arranged in the direction of lens attachment ( Figure 5 The front end of the arrow 44 in (a). That is, the configuration position of the LDET (B) terminal is as described above. Figure 5 The leftmost terminal group of the body side terminal in (a) is also located in the same way as the LDET (L) terminal of the lens side terminal. Figure 6 The front end of the arrow 44). That is, the configuration position of the LDET (L) terminal is as described above. Figure 6 The LDET (B) terminal is located at the far right of the lens-side terminal group in the image. Therefore, until the interchangeable lens is attached, the LDET (B) terminal does not come into contact with any lens-side terminals other than the LDET (L) terminal. Consequently, the signal level of the LDET (B) terminal does not erroneously become low during interchangeable lens attachment, preventing erroneous recognition of lens attachment.

[0085] In the present embodiment, the VBAT (B) terminal is arranged next to the LDET (B) terminal, that is, the second position from the front end in the attachment direction. The VBAT (L) terminal is arranged next to the LDET (L) terminal, that is, the second position from the front end in the attachment direction. This is to reduce the number of terminals on the lens side that are contacted by the VBAT (B) terminal on the camera body side during the attachment of the lens. Since the voltage applied to the VBAT (B) terminal is a high voltage higher than that of other terminals, if a high voltage is mistakenly applied to the VBAT (B) terminal due to a malfunction of the camera system 1, etc., and the VBAT (B) terminal contacts terminals other than the VBAT (L) terminal, the high voltage may cause an unexpected burden on the electrical circuit in the interchangeable lens. In the present embodiment, the VBAT (B) terminal is located next to the LDET (B) terminal, so that when the interchangeable lens 3 is attached, only the LDET (L) terminal among the multiple lens-side terminals contacts the VBAT (B) terminal. As Figure 2 As shown, the LDET (L) terminal is grounded via the resistor R3 , and even if a high voltage is applied from the VBAT (B) terminal, the camera system 1 is not affected.

[0086] In this embodiment, the PGND(B) terminal is located next to the VBAT(B) terminal, third from the front end in the attachment direction. The PGND(L) terminal is located next to the VBAT(L) terminal, third from the front end in the attachment direction. Capacitor C1 connected to the VBAT(L) terminal accumulates a high-voltage charge supplied from the VBAT(B) terminal. When the interchangeable lens 3 is rotated in the removal direction, the VBAT(L) terminal initially contacts the PGND(B) terminal. The charge accumulated in capacitor C1 is immediately discharged through the PGND(B) terminal, which serves as the ground terminal, without affecting other circuits in the camera system 1.

[0087] In this embodiment, the V33(B) terminal is located next to the PGND(B) terminal, i.e., fourth from the front end in the attachment direction, and the GND(B) terminal is located next to it, i.e., fifth from the front end. The V33(L) terminal is located next to the PGND(L) terminal, i.e., fourth from the front end in the attachment direction, and the GND(L) terminal is located next to it, i.e., fifth from the front end. Capacitor C2 connected to the V33(L) terminal accumulates charge corresponding to the voltage supplied from the V33(B) terminal. When the interchangeable lens 3 is rotated in the removal direction, the V33(L) terminal initially contacts the GND(B) terminal. The charge accumulated in capacitor C2 is immediately discharged from the GND(B) terminal, which serves as the ground terminal, without affecting other circuits in the camera system 1.

[0088] The RDY(B) terminal is configured next to the GND(B) terminal, that is, at the sixth bit from the front end, the DATAB(B) terminal is configured next to it, that is, at the seventh bit from the front end, the CLK(B) terminal is configured next to it, that is, at the eighth bit from the front end, the DATAL(B) terminal is configured next to it, that is, at the ninth bit from the front end, and the HCLK(B) terminal is configured next to it, that is, at the tenth bit from the front end, and the HDATA(B) terminal is configured next to it, that is, at the very end.

[0089] The RDY(L) terminal is configured next to the GND(L) terminal, that is, the sixth bit from the front end, the DATAB(L) terminal is configured next to it, that is, the seventh bit from the front end, the CLK(L) terminal is configured next to it, that is, the eighth bit from the front end, the DATAL(L) terminal is configured next to it, that is, the ninth bit from the front end, and the HCLK(L) terminal is configured next to it, that is, the tenth bit from the front end, and the HDATA(L) terminal is configured next to it, that is, at the end.

[0090] Next, the effects of noise on the communication line formed by the body-side terminals and lens-side terminals will be described. Hotline communication is a unilateral transmission of information to the camera body after communication begins, and is performed at a high frequency (repeatedly in extremely short cycles). During hotline communication, a clock signal is transmitted from the HCLK(L) terminal to the HCLK(B) terminal. Because the clock signal repeats high and low levels in a short cycle, it can be a significant noise source for other signals. Furthermore, the clock signal transmitted from the HCLK(L) terminal to the HCLK(B) terminal is output from the interchangeable lens 3. Therefore, even if noise is inadvertently added to this clock signal, the camera body 2 cannot detect it. Thus, the signal flowing through the HCLK terminal can become a noise source for the camera body 2, leading to malfunctions in the camera system 1. Examples of malfunctions include misdetection of interchangeable lens attachment and / or misinterpretation of command communication. In this embodiment, the HCLK terminal is located away from the VBAT terminal, which is applied with a high voltage. In addition, the HCLK terminal and the RDY terminal used to indicate whether command communication is possible are arranged separately so as not to be adjacent to each other.

[0091] Furthermore, the HDATA and DATAL terminals are located on the left and right sides of the HCLK terminal, thereby suppressing the influence of noise from the HCLK terminal on terminals other than the HDATA and DATAL terminals.

[0092] Next, as mentioned above, command data communication is bidirectional communication between the camera body and the interchangeable lens. During command data communication, a clock signal is transmitted from the CLK(B) terminal to the CLK(L) terminal. The clock signal transmitted via the CLK terminal can also become a noise source for the same reasons as mentioned above. Therefore, in this embodiment, the CLK terminal is located away from the VBAT terminal, which is applied with a high voltage. Furthermore, the CLK terminal and the RDY terminal, used to indicate the availability of command communication, are separated so that they are not adjacent. Furthermore, if the HCLK and CLK terminals were placed adjacent, the clock signal from one could affect the other, potentially becoming a noise source. In this embodiment, the DATAL terminal is located between the CLK and HCLK terminals. Furthermore, the DATAB terminal is located between the CLK and RDY terminals. In other words, the DATAL and DATAB terminals are located on either side of the CLK terminal. This arrangement minimizes the impact of noise from the CLK terminal on the camera system.

[0093] As mentioned above, command data communication requires determining the level of the RDY terminal. That is, the signal level of the RDY terminal indicates whether command data communication is possible, so noise can significantly affect shooting operations. Consider a situation where the body-side control unit 23 mistakenly identifies a communication state as possible due to noise, even though command data communication is impossible. In this case, the lens-side control unit 33 cannot receive command data, but the body-side control unit 23 transmits command data, mistakenly identifying that control will be performed in accordance with this command data during lens exchange. However, the lens-side control unit 33 does not receive the command data and therefore does not perform control in accordance with the erroneously transmitted command data. This can hinder the operation of the camera system 1. Therefore, it is necessary to prevent noise from being added to the signal at the RDY terminal. To prevent noise from being added to the signal at the RDY terminal, it is preferable to place terminals on the left and right sides of the RDY terminal that carry relatively stable signals, i.e., signals whose signal level fluctuates less per unit time. In this embodiment, the GND and DATAB terminals are placed on the left and right sides of the RDY terminal. The GND terminal is a ground potential terminal and therefore stable, and the DATAB terminal also carries a more stable signal than the CLK terminal and / or HCLK terminal. This can suppress the influence of noise on the signal of the RDY terminal.

[0094] Next, the power supplied from the VBAT (B) terminal to the VBAT (L) terminal is used to drive the actuator (e.g., a stepping motor, etc.) of the drive unit 37 of the interchangeable lens 3. Therefore, the current flowing through the VBAT terminal fluctuates greatly when the actuator is driven and when it is not driven. This current fluctuation becomes a noise source for the signals flowing through other terminals. In this embodiment, the VBAT terminal is arranged at a position away from the RDY terminal, DATAB terminal, CLK terminal, DATAL terminal used for command data communication, and the HCLK terminal and HDATA terminal used for hotline communication. Furthermore, the GND terminal, V33 terminal, and PGND terminal are arranged between the VBAT terminal and the terminals used for these communications. In this way, the influence of noise caused by fluctuations in the current flowing through the VBAT terminal on data communication can be suppressed.

[0095] The terminal configurations described above in consideration of noise are summarized here.

[0096] The RDY terminal is separated from the VBAT terminal and the HCLK terminal, which are noise sources, so as not to be adjacent to each other. This can suppress the influence of noise on the RDY terminal used to indicate whether command communication is possible.

[0097] The HCLK terminal, which can be a noise source, is placed between the HDATA and DATAL terminals, while the CLK terminal is placed between the DATAL and DATAB terminals. That is, from the rear end in the mounting direction, the HDATA, HCLK, DATAL, CLK, and DATAB terminals are arranged in this order. This reduces the effects of clock signal noise on the RDY terminal and other terminals.

[0098] Furthermore, to account for the effects of noise, the power supply terminal group and the communication terminal group are separated, separated by the RDY terminal. Specifically, the power supply terminals (VBAT, PGND, V33, and GND) are arranged in order from the front end, separated by the RDY terminal. Meanwhile, the communication terminals (DATAB, CLK, DATAL, HCLK, and HDATA) are arranged in order from the front end, separated by the RDY terminal. This reduces the effects of noise on the RDY terminal from the power supply terminal group (VBAT, etc.) and the communication terminals (HCLK, CLK, etc.).

[0099] The HCLK terminal, which transmits the clock signal used in hotline communication, and the CLK terminal, which transmits the clock signal used in command and data communication, are located farther from the VBAT terminal than the CLK terminal. This is because the clock signal transmitted from the CLK terminal to the interchangeable lens is output by the body-side control unit 23 via the body-side communication unit 24. If noise is added to the clock signal transmitted from the interchangeable lens to the camera body via the lens-side communication unit 34 and via the HCLK(L) terminal, the body-side control unit 23 may misidentify it. Therefore, the noise added to the clock signal transmitted to the HCLK terminal has a greater impact on the camera system 1.

[0100] Regarding the HCLK and GND terminals, the HCLK terminal is located farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is placed between the GND and VBAT terminals. This shields the HCLK terminal, which transmits the clock signal used in hotline communications, from noise caused by the VBAT terminal.

[0101] Regarding the CLK and GND terminals, the CLK terminal is located farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is placed between the GND and VBAT terminals. This shields the CLK terminal, which transmits the clock signal used for command and data communications, from noise caused by the VBAT terminal.

[0102] (Terminal configuration taking wear into account)

[0103] Hereinafter, the contact of each terminal when attaching or detaching the interchangeable lens 3 to or from the camera body 2 will be described.

[0104] When the interchangeable lens 3 is attached to the camera body 2, the body-side terminals and lens-side terminals come into contact one by one. The same thing happens when the interchangeable lens 3 is removed from the camera body 2. Specifically, the pins protruding from the body-side terminal retaining portion 22, or the body-side terminals, rub against the exposed conductive contact surfaces, or the lens-side terminals, one by one. Because multiple interchangeable lenses are attached and removed from a single camera body, the body-side terminals are more susceptible to wear than the lens-side terminals. In particular, the body-side terminals located at the rear end of the interchangeable lens 3's attachment direction rub against more lens-side terminals, resulting in greater friction. Therefore, the tips of the pins on the rear-end body terminals are more susceptible to wear than those on the front end. Wear on the body-side terminals can affect contact with the lens-side terminals, potentially leading to unstable data communications.

[0105] In this embodiment, the LDET (B) terminal is positioned at the front end in the attachment direction, minimizing wear on the LDET (B) terminal. This ensures good contact between the LDET (B) terminal and the LDET (L) terminal, minimizing the likelihood of false detection of the attachment or removal of the interchangeable lens 3.

[0106] As previously mentioned, in this embodiment, to minimize the impact of noise on communication, the CLK(B) and HCLK(B) terminals are positioned away from the VBAT(B) terminal. Specifically, the VBAT(B) terminal is positioned second from the front end in the attachment direction, while the CLK(B) and HCLK(B) terminals are positioned further back than the VBAT(B) terminal. Consequently, the CLK(B) and HCLK(B) terminals are subject to greater wear than the LDET(B) and VBAT(B) terminals. In this embodiment, the CLK(B) and HCLK(B) terminals are positioned immediately adjacent to the first body-side claw 29a. Specifically, the CLK(B) and HCLK(B) terminals are positioned closer to the inner periphery of the first body-side claw 29a than the VBAT(B) terminal. In other words, the distance between the CLK (B) terminal and the inner periphery of the first body-side claw portion 29a is shorter than the distance between the VBAT (B) terminal and the inner periphery of the first body-side claw portion 29a, and the distance between the HCLK (B) terminal and the inner periphery of the first body-side claw portion 29a is shorter than the distance between the VBAT (B) terminal and the inner periphery of the first body-side claw portion 29a. As described above, the first leaf spring 41a is provided on the back side of the first body-side claw portion 29a, and the first leaf spring 41a is used to move the first lens-side claw portion 39a in the +Z direction ( Figure 1) is pressed. From the perspective of the first leaf spring 41a, the distances between the CLK(B) terminal and the first leaf spring 41a, as well as the distances between the HCLK(B) terminal and the first leaf spring 41a, are both shorter than the distances between the VBAT(B) terminal and the first leaf spring 41a. Similarly to the VBAT(B) terminal, the distances between the LDET(B) terminal and the first leaf spring 41a, as well as the distances between the CLK(B) terminal and the first leaf spring 41a, are both shorter than the distances between the LDET(B) terminal and the first leaf spring 41a. For this reason, the CLK(B) and HCLK(B) terminals are pressed more strongly against the lens-side terminals than the VBAT(B) and LDET(B) terminals.

[0107] On the lens side, the CLK(L) and HCLK(L) terminals are also located closer to the inner edge of the first lens-side claw 39a than the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner edge of the first lens-side claw 39a is shorter than the distance between the VBAT(L) terminal and the inner edge of the first lens-side claw 39a. Furthermore, the distance between the HCLK(L) terminal and the inner edge of the first lens-side claw 39a is shorter than the distance between the VBAT(L) terminal and the inner edge of the first lens-side claw 39a. Therefore, when the lens is attached, the CLK(L) and HCLK(L) terminals, located adjacent to the first lens-side claw 39a, are pressed against their corresponding body-side terminals by the first leaf spring 41a. Similarly to the VBAT(L) terminal, the distances between the CLK(L) terminal and the first leaf spring 41a, and the distances between the HCLK(L) terminal and the first leaf spring 41a, are shorter than those between the LDET(L) terminal and the first leaf spring 41a, respectively, when the camera is attached. This allows the CLK(L) and HCLK(L) terminals to be pressed against the camera body-side terminal with a stronger force than the LDET(L) terminal when attached. This ensures that even if the CLK(B) and / or HCLK(B) terminals wear, good contact is maintained, resulting in a stable clock signal and robust data communication. Furthermore, even if an impact is applied to the camera body 2 and / or interchangeable lens 3 while the camera is attached, the contact between the CLK(B) and CLK(L) terminals, and between the HCLK(B) and HCLK(L) terminals, remains intact.

[0108] Even if a portion of the first lens-side claw 39a is grooved, the entirety of the protrusion located in the area facing the first body-side claw 29a and the grooved portion is considered the first lens-side claw. The grooves can be formed by circumferentially dividing the lens-side claw into two or more pieces, by cutting away a portion of the lens-side claw, or by shortening the radial length of at least a portion of the lens-side claw. Furthermore, the circumferential length of the lens-side claw can be varied within the range that passes through the corresponding body-side insertion and removal portion. The same applies to the second lens-side claw 39b, the third lens-side claw 39c, and the fourth lens-side claw 39d. Furthermore, the radial thickness of the cylindrical portion can be varied as appropriate, and at least a portion of the cylindrical portion in this embodiment can protrude inward.

[0109] As mentioned above, the CLK(B) and HCLK(B) terminals are subject to greater wear than the LDET(B) and VBAT(B) terminals. In this embodiment, the CLK(B) and HCLK(B) terminals are located immediately adjacent to the first body-side claw 29a. Specifically, the CLK(B) and HCLK(B) terminals are located closer to the inner periphery of the first body-side claw 29a than the LDET(B) and / or VBAT(B) terminals. In other words, the distance between the CLK (B) terminal and the inner periphery of the first body-side claw portion 29a is shorter than the distance between the LDET (B) terminal and / or the VBAT (B) terminal and the inner periphery of the first body-side claw portion 29a. In addition, the distance between the HCLK (B) terminal and the inner periphery of the first body-side claw portion 29a is shorter than the distance between the LDET (B) terminal and / or the VBAT (B) terminal and the inner periphery of the first body-side claw portion 29a. As described above, the first leaf spring 41a is provided on the back side of the first body-side claw portion 29a, and the first leaf spring 41a is used to move the first lens-side claw portion 39a in the +Z direction ( Figure 1 From the perspective of the first leaf spring 41a, the distance between the CLK(B) terminal and the first leaf spring 41a, as well as the distance between the HCLK(B) terminal and the first leaf spring 41a, are also shorter than the distance between the LDET(B) terminal and / or the VBAT(B) terminal and the first leaf spring 41a.

[0110] On the lens side, the CLK(L) and HCLK(L) terminals are also located closer to the inner edge of the first lens-side claw 39a than the LDET(L) and / or VBAT(L) terminals. In other words, the distance between the CLK(L) terminal and the inner edge of the first lens-side claw 39a is shorter than the distance between the LDET(L) and / or VBAT(L) terminals. Furthermore, the distance between the HCLK(L) terminal and the inner edge of the first lens-side claw 39a is shorter than the distance between the LDET(L) and / or VBAT(L) terminals. Therefore, the CLK(L) and HCLK(L) terminals, located adjacent to the first lens-side claw 39a, are pressed against their corresponding body-side terminals by the first leaf spring 41a. This allows the CLK(B) and HCLK(B) terminals to be pressed against the lens-side terminals more strongly than the LDET(B) and / or VBAT(B) terminals. This ensures that even if the CLK(B) and / or HCLK(B) terminals become worn, they maintain good contact and stable communication. Furthermore, even if, for example, the camera body 2 and / or interchangeable lens 3 are subjected to an impact while still attached, the CLK(B) and HCLK(B) terminals maintain contact with the lens-side terminals.

[0111] In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are also close to the fourth claw 29d on the body side. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the fourth claw 29d on the body side than the VBAT(B) terminal and / or the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the fourth claw 29d on the body side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw 29d on the body side, and the distance between the HCLK(B) terminal and the fourth claw 29d on the body side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw 29d on the body side. As described above, there is a fourth leaf spring 41d on the back side of the fourth claw 29d on the body side, and the fourth leaf spring 41d is used to move the fourth claw 39d on the lens side in the +Z direction ( Figure 1 Therefore, the CLK (B) terminal and the HCLK (B) terminal located near the fourth claw portion 39 d on the lens side are pressed against the lens side terminals more stably and more strongly than the VBAT (B) terminal and / or the LDET (B) terminal by the fourth leaf spring 41 d.

[0112] The aforementioned distance between the CLK(B) terminal and the first body-side claw 29a (the same also applies to the fourth body-side claw 29d, omitted below) refers to the linear distance between one end of the first body-side claw 29a and the CLK(B) terminal. Alternatively, the aforementioned distance between the CLK(B) terminal and the first body-side claw 29a can be defined as the linear distance between the other end of the first body-side claw 29a and the CLK(B) terminal. Alternatively, the aforementioned distance between the CLK(B) terminal and the first body-side claw 29a can be defined as the linear distance between the middle position of the first body-side claw 29a in the circumferential direction of the body-side assembly 21 and the CLK(B) terminal. The distances between the first body-side claw 29a and other body-side terminals, such as the HCLK(B) terminal, VBAT(B) terminal, and LDET(B) terminal, are also linear distances. The distances between the first leaf spring 41a (fourth leaf spring 41d) and the body-side terminals are also linear distances.

[0113] Furthermore, the distance between the CLK(B) terminal and the first body-side claw 29a (the same also applies to the fourth body-side claw 29d, omitted below) can be defined as either an arc-shaped distance between one end of the first body-side claw 29a and the CLK(B) terminal, or as an arc-shaped distance between the other end of the first body-side claw 29a and the CLK(B) terminal, in the circumferential direction of the body-side assembly 21. Alternatively, the distance between the CLK(B) terminal and the first body-side claw 29a can be defined as an arc-shaped distance between the middle position of the first body-side claw 29a and the CLK(B) terminal, in the circumferential direction of the body-side assembly 21. The distances between the first body-side claw 29a and other body-side terminals, such as the HCLK(B) terminal, VBAT(B) terminal, and / or LDET(B) terminal, are similarly arc-shaped. The distance between the first leaf spring 41 a (fourth leaf spring 41 d ) and the body-side terminal is also an arc-shaped distance.

[0114] The above description is for the camera body 2, and the same applies to the interchangeable lens 3. In the present embodiment, the CLK(L) terminal and the HCLK(L) terminal are arranged next to the first claw portion 39a on the lens side. That is, the CLK(L) terminal and the HCLK(L) terminal are arranged at a position closer to the first claw portion 39a on the lens side than the VBAT(L) terminal and the LDET(L) terminal. In other words, the distance between the CLK(L) terminal and the first claw portion 39a on the lens side is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the first claw portion 39a on the lens side is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw portion 39a on the lens side. The first claw portion 39a on the lens side is held in the +Z direction ( Figure 1Therefore, similarly to the above, the CLK (L) terminal and the HCLK (L) terminal located near the first claw portion 39a on the lens side are pressed against the body side terminals more strongly than the VBAT (L) terminal or the LDET (L) terminal by the first leaf spring 41a.

[0115] In this embodiment, if Figure 5 As shown in (a), the CLK(B) and HCLK(B) terminals are arranged within the fan-shaped area (within an angle of 50°) formed by the center of the opening of the mounting member 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped first body-side claw 29a. Alternatively, the CLK(B) and HCLK(B) terminals are arranged within the triangular area formed by the center of the opening of the mounting member 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the inner circumferential ends of the first body-side claw 29a. Therefore, the first body-side claw 29a is not located on the extension of the dot-dash line 51 connecting the center of the opening of the mounting member 21 and the LDET(B) terminal. However, the first body-side claw 29a is located on the extension of the dot-dash line 52 connecting the center of the opening of the mounting member 21 and the HCLK(B) terminal, and the first body-side claw 29a is located on the extension of the dot-dash line 53 connecting the center of the opening of the mounting member 21 and the CLK(B) terminal. Consequently, when the mounting is complete, the CLK(B) and HCLK(B) terminals are pressed more strongly against their corresponding lens-side terminals than the LDET(B) terminal.

[0116] like Figure 6As shown, the CLK(L) and HCLK(L) terminals are located within the fan-shaped area (within an angle of 60°) formed by the center of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arcuate lens-side first claw 39a. Alternatively, the CLK(L) and HCLK(L) terminals are located within the triangular area formed by the center of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the outer ends of the first lens-side claw 39a. Therefore, the first lens-side claw 39a does not exist on the extension of the dotted-dash line 61 connecting the center of the opening of the mount 31 and the LDET(L) terminal. Instead, the first lens-side claw 39a exists on the extension of the dotted-dash line 62 connecting the center of the opening of the mount 31 and the HCLK(L) terminal, and the first lens-side claw 39a exists on the extension of the dotted-dash line 63 connecting the center of the opening of the mount 31 and the CLK(L) terminal. As a result, when attached, the CLK(L) and HCLK(L) terminals maintain more stable contact with the corresponding body-side terminals than the LDET(L) terminal. In other words, the CLK(L) and HCLK(L) terminals press against the body-side terminals with greater force than the LDET(L) terminal. Therefore, even if the tips of the CLK(B) and HCLK(B) terminals are worn, the camera body 2 and interchangeable lens 3 can maintain stable clock signal communication.

[0117] The following modifications are possible, and one or more modifications can be combined with the above-described embodiment.

[0118] (Variation 1)

[0119] A terminal used for command data communication or hotline communication may also function as a power-on signal from the interchangeable lens 3 to the camera body 2. For example, the interchangeable lens 3 can be provided with a power switch function. Even when the interchangeable lens 3 is attached and the camera system 1 is powered off, the power supply unit 26 supplies power from the V33 (B) terminal to the lens-side control unit 33 of the interchangeable lens 3. When the power switch of the interchangeable lens 3 is operated, the lens-side control unit 33 outputs a power-on signal to the RDY (L) terminal via the lens-side communication unit 34, for example. Upon detecting the power-on signal via the RDY (B) terminal via the body-side communication unit 24, the body-side control unit 23 switches the camera system 1 from the power-off state to the power-on state, similar to when the power switch (not shown) provided on the camera body 2 is operated.

[0120] (Variation 2)

[0121] In the embodiment, the DATAB(B) terminal is arranged at the front end side of the CLK(B) terminal in the attachment direction, and the DATAL(B) terminal is arranged at the rear end side. However, the positions of the DATAB(B) terminal and the DATAL(B) terminal may be reversed. In other words, the DATAL(B) terminal, CLK(B) terminal, and DATAB(B) terminal may be arranged in this order from the front end side in the attachment direction.

[0122] Furthermore, in the above embodiment, interchangeable camera lenses are used as an example of accessories, but accessories are not limited to interchangeable lenses. For example, they may be teleconverters and / or wide-angle lenses, extension tubes, etc., which are attached between the camera body and the interchangeable lens to change the focal length of the interchangeable lens. Alternatively, they may be used as mounting adapters that allow accessories, including interchangeable lenses of other mounting standards, to be attached to the aforementioned camera body mounting accessories. In other words, any accessory used to attach to a camera body mounting accessory is equally applicable. In this case, the lens-side terminal group, lens-side claw portion 39, lens-side communication unit 34, etc., correspond to the accessory-side terminal group, accessory-side protrusion, accessory-side communication unit, etc., of each accessory.

[0123] In the above embodiment, an accessory is provided that can be removed from and installed on a camera body, but the above camera body may be an assembly adapter that enables an interchangeable lens of the above assembly standard to be attached to a camera body that is different from the above assembly standard, or may be configured so that the above accessory can be attached to the assembly adapter.

Claims

1. An accessory to be mounted on a camera body, the camera body comprising: a plurality of camera-side terminals; a plurality of camera-side protrusions each protruding toward the center of an opening of a lens mount; and a plurality of elastic members provided at positions corresponding to the plurality of camera-side protrusions, the accessory comprising: a first accessory-side terminal that contacts a first camera-side terminal among the plurality of camera-side terminals and changes a voltage of the first camera-side terminal by contact with the first camera-side terminal; an eighth accessory-side terminal, the eighth terminal being in contact with the eighth camera-side terminal among the plurality of camera-side terminals, and receiving a first clock signal used in transmitting a first data signal from the camera body to the accessory; a tenth accessory-side terminal, which is a terminal that contacts the tenth camera-side terminal among the plurality of camera-side terminals and outputs a second clock signal used in transmitting a second data signal from the accessory to the camera body; an accessory-side second terminal in contact with a camera-side second terminal for supplying the first power among the plurality of camera-side terminals; an accessory-side fourth terminal in contact with a fourth camera-side terminal for supplying a second power different from the first power among the plurality of camera-side terminals; a seventh accessory-side terminal in contact with a seventh camera-side terminal among the plurality of camera-side terminals for transmitting the first data signal from the camera body to the accessory in synchronization with the first clock signal; an eleventh accessory-side terminal in contact with the eleventh camera-side terminal among the plurality of camera-side terminals for transmitting the second data signal from the accessory to the camera body in synchronization with the second clock signal; a ninth accessory-side terminal in contact with a ninth camera-side terminal among the plurality of camera-side terminals for transmitting a third data signal from the accessory to the camera body in synchronization with the first clock signal; and The first accessory-side protrusion, the second accessory-side protrusion, the third accessory-side protrusion, and the fourth accessory-side protrusion are arranged at intervals from each other in the circumferential direction and are respectively pressed toward the camera body by the plurality of elastic members. The accessory side terminal 7 and the accessory side terminal 9 are arranged on the left and right sides of the accessory side terminal 8. The 9th terminal on the accessory side and the 11th terminal on the accessory side are arranged on the left and right sides of the 10th terminal on the accessory side. The eighth accessory-side terminal and the tenth accessory-side terminal are arranged at positions where the distance from the first accessory-side protrusion is shorter than the distance between the first accessory-side terminal and the first accessory-side protrusion.

2. The accessory according to claim 1, The tenth accessory-side terminal is arranged inside a fan-shaped portion formed by the center of the opening and the first accessory-side protrusion.

3. The accessory according to claim 1 or 2, When the accessory is mounted on the camera body, the accessory-side first terminal comes into contact with the camera-side first terminal, thereby reducing the voltage of the camera-side first terminal.

4. The accessory according to claim 1 or 2, The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The accessory-side seventh terminal contacts the camera-side seventh terminal after contacting the camera-side eighth terminal and the camera-side tenth terminal during movement from the insertion position to the attachment position.

5. The accessory according to claim 1 or 2, The accessory-side fourth terminal is a terminal located fourth from the front end in the attachment direction.

6. The accessory according to claim 1 or 2, The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The ninth accessory-side terminal contacts the ninth camera-side terminal after contacting the tenth camera-side terminal during movement from the insertion position to the attachment position.

7. The accessory according to claim 1 or 2, The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The accessory side second terminal, the accessory side seventh terminal, the accessory side eighth terminal, the accessory side ninth terminal, the accessory side tenth terminal, and the accessory side eleventh terminal are sequentially arranged along the movement direction of the accessory from the insertion position to the attachment position.

8. The accessory according to claim 1 or 2, The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The first terminal on the accessory side, the second terminal on the accessory side, the fourth terminal on the accessory side, the seventh terminal on the accessory side, the eighth terminal on the accessory side, the ninth terminal on the accessory side, the tenth terminal on the accessory side and the eleventh terminal on the accessory side are arranged in sequence along the moving direction of the accessory from the insertion position to the attachment position.

9. The accessory according to claim 1 or 2, A sixth accessory-side terminal is provided, the sixth accessory-side terminal being in contact with a sixth camera-side terminal for detecting whether communication in synchronization with the first clock signal is possible among the plurality of camera-side terminals. The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The first terminal on the accessory side, the second terminal on the accessory side, the fourth terminal on the accessory side, the sixth terminal on the accessory side, the seventh terminal on the accessory side, the eighth terminal on the accessory side, the ninth terminal on the accessory side, the tenth terminal on the accessory side and the eleventh terminal on the accessory side are arranged in sequence along the moving direction of the accessory from the insertion position to the attachment position.

10. The accessory according to claim 1 or 2, The accessory includes a third terminal on the accessory side that contacts the third terminal on the camera side, which serves as the first ground terminal, and a fifth terminal on the accessory side that contacts the fifth terminal on the camera side, which serves as the second ground terminal. The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The first terminal on the accessory side, the second terminal on the accessory side, the third terminal on the accessory side, the fourth terminal on the accessory side, the fifth terminal on the accessory side, the seventh terminal on the accessory side, the eighth terminal on the accessory side, the ninth terminal on the accessory side, the tenth terminal on the accessory side and the eleventh terminal on the accessory side are arranged in sequence along the moving direction of the accessory from the insertion position to the attachment position.

11. The accessory according to claim 1 or 2, Both the tenth accessory-side terminal and the eleventh accessory-side terminal are arranged inside a sector-shaped portion formed by the center of the opening and the first accessory-side protrusion.

12. The accessory according to claim 1 or 2, The accessory comprises a third terminal on the accessory side that contacts the third terminal on the camera side that serves as a first ground terminal, a fifth terminal on the accessory side that contacts the fifth terminal on the camera side that serves as a second ground terminal, and a sixth terminal on the accessory side that contacts a sixth terminal on the camera side that is used to detect whether communication synchronous with the first clock signal is possible among the plurality of camera side terminals. The first accessory-side protrusion moves from an insertion position inserted between the plurality of camera-side protrusions in the circumferential direction to an attachment position facing one of the plurality of camera-side protrusions. The first terminal on the accessory side, the second terminal on the accessory side, the third terminal on the accessory side, the fourth terminal on the accessory side, the fifth terminal on the accessory side, the sixth terminal on the accessory side, the seventh terminal on the accessory side, the eighth terminal on the accessory side, the ninth terminal on the accessory side, the tenth terminal on the accessory side, and the eleventh terminal on the accessory side are arranged in sequence along the moving direction of the accessory from the insertion position to the attachment position.

13. The accessory according to claim 1 or 2, The accessory is a replacement lens.

Images