Accessory

Abstract

To provide an accessory capable of performing stable communication with a camera body.SOLUTION: An accessory is mounted to a camera body including: a camera side first clock terminal that outputs a first clock signal; a camera side first data terminal that outputs a first data signal; and a camera side third data terminal into which a third data signal is input. The accessory has: an eighth terminal that is in contact with the camera side first clock terminal; a seventh terminal that is in contact with the camera side first data terminal; and a ninth terminal that is in contact with the camera side third data terminal. The eighth terminal is arranged between the seventh terminal and the ninth terminal.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to an accessory. [Background technology]

[0002] 2. Description of the Related Art There are known accessories that can be attached to and detached from a camera body (for example, see Patent Document 1). Conventionally, it has been necessary to attach the accessory to the camera body in a state in which it can be used properly. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2004-117380 A Summary of the Invention

[0004] According to a first aspect, an accessory is attached to a camera body and has a camera-side first clock terminal that outputs a first clock signal, a camera-side first data terminal that outputs a first data signal, and a camera-side third data terminal to which a third data signal is input, wherein the accessory has an eighth terminal in contact with the camera-side first clock terminal, a seventh terminal in contact with the camera-side first data terminal, and a ninth terminal in contact with the camera-side third data terminal, and the 8th terminal is disposed between the seventh terminal and the 9th terminal. [Brief description of the drawings]

[0005] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of a camera system. [Diagram 2] A schematic circuit diagram showing the electrical connection between the camera body and the interchangeable lens. [Diagram 3] A timing chart showing an example of command data communication [Figure 4] Timing chart showing an example of hotline communication [Diagram 5]A front view showing the mount surface of the camera body as seen from the interchangeable lens side. [Figure 6] A front view showing the mount surface of the interchangeable lens as seen from the camera body side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0006] (First embodiment) 1 is a diagram showing an outline of the configuration of a camera system 1 according to a 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 attached to and detached from the camera body 2.

[0007] The interchangeable lens 3 has a lens side mount 31, a lens side terminal holding section 32, a lens side control section 33, a lens side communication section 34, a lens side storage section 35, an imaging optical system 36, and a drive section 37. The lens side mount 31 and the lens side terminal holding section 32 will be described in detail later.

[0008] The lens side control unit 33 is composed of a microcomputer and its peripheral circuits, etc. 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 control unit 33 and a lens side terminal group (described later) provided in the lens side terminal holding unit 32. The lens side memory unit 35 is a non-volatile storage medium. The lens side memory unit 35 is connected to the lens side control unit 33. The lens side memory unit 35 stores in advance a predetermined control program to be executed by the lens side control unit 33, etc. The lens side control unit 33 controls the interchangeable lens 3 by reading the control program from the lens side memory unit 35 and executing the program.

[0009] The imaging optical system 36 forms a subject image on the imaging surface of the imaging element 27, which will be described later. The optical axis O of the imaging optical system 36 approximately coincides with the center positions of the lens side mount 31 and the body side mount 21, which will be described later. The imaging optical system 36 in FIG. 1 roughly includes a lens 36a, a focus lens 36b, and a lens 36c. The focus lens 36b is a lens that adjusts the imaging position of the subject image. The drive unit 37 is connected to the lens side control unit 33, and has an actuator (not shown) and the like. The drive unit 37 drives the focus lens 36b in the optical axis direction (+Z direction, -Z direction) by the actuator and the like.

[0010] The camera body 2 has a body side mount 21, a body side terminal holding section 22, a body side control section 23, a body side communication section 24, a body side memory section 25, a power supply section 26, an image sensor 27, and a switch 28 that detects the state of a lock pin, which will be described later.

[0011] The body side control unit 23 is composed of a microcomputer and its peripheral circuits. The body side control unit 23 performs various controls of the body, but in this embodiment, only the communication-related portion is 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 control unit 23 and a body side terminal (described later) provided on the body side terminal holding unit 22. Some terminals of the body side terminal holding unit 22 are connected to the body side control unit 23, as will be 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. The body side storage unit 25 stores in advance a predetermined control program to be executed by the body side control unit 23. The body side control unit 23 controls the camera body 2 by reading the control program from the body side storage unit 25 and executing the program.

[0012] The power supply unit 26 has a power source and supplies power to the inside of the camera body 2 and the interchangeable lens 3. The power supply unit 26 is connected to a group of body side terminals (described later) provided on the body side terminal holding unit 22 and to the body side control unit 23. The image sensor 27 is, for example, a solid-state image sensor such as a CCD or CMOS. The image sensor 27 is connected to the body side control unit 23, captures an image of a subject, and outputs an image signal. A description of the processing of the output image signal will be omitted.

[0013] 2 is a circuit diagram showing a schematic diagram of the electrical connection between the camera body 2 and the interchangeable lens 3. The body side terminal holding section 22 has a LDET(B) terminal, a VBAT(B) terminal, a PGND(B) terminal, a V33(B) terminal, a GND(B) terminal, a 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 the body side terminal group.

[0014] The LDET(B) terminal is a terminal used for detecting attachment / detachment 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 via a resistor R1 is connected between the resistor R2 and the body side control unit 23, and the LDET(B) terminal is pulled up.

[0015] The VBAT(B) terminal, the PGND(B) terminal, the V33(B) terminal, and the GND(B) terminal are power supply system terminals connected to the power supply unit 26. In FIG. 2, the direction of the supplied power is indicated by an arrow. The VBAT(B) terminal is a terminal used to supply 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. The operation of the drive unit 37 requires a voltage and a current larger than those of the lens side control unit 33, and the voltage applied by the power supply unit 26 to the VBAT(B) terminal is a maximum of about 10V. In the following description, the voltage applied by the power supply unit 26 to the VBAT(B) terminal is referred to as the drive system voltage. The PGND(B) terminal is a ground terminal corresponding to the VBAT(B) terminal.

[0016] The V33(B) terminal is a terminal used to supply power to the interchangeable lens 3. The lens side control unit 33 and other components are operated by power supplied from the power supply unit 26 via the V33(B) terminal. The lens side control unit 33 and other components operate at a smaller voltage and current than the drive unit 37. The voltage that the power supply unit 26 applies to the V33(B) terminal is a maximum of approximately 3.3V. In the following description, the voltage that the power supply unit 26 applies to the V33(B) terminal is referred to as the circuit system voltage. The GND(B) terminal is a ground terminal corresponding to the V33(B) terminal.

[0017] The RDY(B) terminal is connected to the body side communication unit 24. The DATAB(B) terminal, the CLK(B) terminal, the DATAL(B) terminal, the HCLK(B) terminal, and the HDATA(B) terminal are communication terminals connected to the body side communication unit 24. The RDY(B) terminal, the DATAB(B) terminal, the CLK(B) terminal, and the DATAL(B) terminal are used for command data communication, which will be described later. The HCLK(B) terminal and the HDATA(B) terminal are connected to the body side communication unit 24 and used for hotline communication, which will be described later. In FIG. 2, the flow of signals is indicated by arrows. The potential of the RDY(B) terminal indicates whether the interchangeable lens 3 is capable of command data communication. The DATAB(B) terminal is a terminal from which a data signal is output toward the interchangeable lens 3. The CLK(B) terminal is a terminal from which a clock signal is output toward the interchangeable lens 3.

[0018] The DATAL(B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0019] The HCLK(B) terminal is a terminal to which a clock signal is input from the interchangeable lens 3. The HDATA(B) terminal is a terminal to which a data signal is input from the interchangeable lens 3.

[0020] The lens side terminal holding unit 32 has 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. These 11 lens side terminals are collectively referred to as the lens side terminal group. When the interchangeable lens 3 is attached to the camera body 2, the body side terminals and the lens side terminals are electrically connected, as shown by the dashed lines in FIG. 2. 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 roles of the individual lens side terminals are the same as the roles of the body side terminals that they contact, so a description thereof will be omitted.

[0021] The LDET(L) terminal is grounded via a resistor R3. When the LDET(L) terminal comes into contact with 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 driving 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 each unit 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, the DATAB(L) terminal, the CLK(L) terminal, the DATAL(L) terminal, the HCLK(L) terminal, and the HDATA(L) terminal are each connected to the lens side communication unit 34.

[0022] (Explanation of command data communication) Communication in which a control command (command) from the body side control unit 23 is sent to the lens side control unit 33 of the interchangeable lens 3, and then the control content (control data) from the body side control unit 23 and the response content (response data) from the lens side control unit 33 are sent and received in parallel is called command data communication. Command data communication is full-duplex communication. Command data communication is performed by digital data communication using 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 via the body side communication unit 24 and the lens side communication unit 34.

[0023] The body side control unit 23 transmits various control commands and control contents to the interchangeable lens 3 by command data communication via the body side communication unit 24 and the lens side communication unit 34, and transmits and receives various information to and from the interchangeable lens 3 by receiving response contents from the interchangeable lens 3. The control command here is, for example, a command to transmit lens information. The various information received from the interchangeable lens 3 is, for example, model information of the interchangeable lens 3 and information indicating optical characteristics such as the focal length of the imaging optical system 36. The various information transmitted to the interchangeable lens 3 is, for example, control contents such as the driving amount of the lens and model information of the camera body 2. The control command also includes a drive command for the focus lens 36b. The lens side control unit 33 receives various control commands from the body side control unit 23, acquires various information from the body side control unit 23, and transmits various information to the body side control unit 23 by command data communication.

[0024] 3 is an example of a timing chart showing the timing of command data communication. At the start of command data communication (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 is capable of command data communication. If the lens-side control unit 33 is in a state where command data communication is not possible, it sets the signal level (electric potential) of the RDY(L) terminal to a high level (H level). If the lens-side control unit 33 is in a state where command data communication is possible, it sets the signal level (electric potential) of the RDY(L) terminal to a low level (L level) via the lens-side communication unit 34.

[0025] At the start of command data communication (T1), if the signal level of the RDY(B) terminal is low level (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. The frequency at which the high level and the low level of the clock signal 401 in FIG. 3 are repeated is, for example, 8 MHz. The body side control unit 23 outputs a body side command signal 402, which is a control command, from the DATAB(B) terminal in synchronization with the clock signal 401. That is, 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. The body side command signal 402, which is indicated by switching between high level and low level of DATAB in FIG. 3, is a signal indicating a control command given by the body side control unit 23 to the lens side control unit 33 by command data communication. For example, the body side command signal 402 is a signal that requests model information of the interchangeable lens 3, or a signal that instructs driving the focus lens 36b.

[0026] When the lens side control unit 33 receives the body side command signal 402 via the lens side communication unit 34, it executes an inspection process to check whether or not there is a communication error in the body side command signal 402, using an error detection code (e.g., checksum data) included in the body side command signal 402. After that, the lens side control unit 33 sets the signal level of the RDY(L) terminal to a high level (H level) (T2). If the signal level of the RDY(B) terminal is a high level, the body side control unit 23 does not transmit the body side command signal 402. The lens side control unit 33 starts a first control process 404 based on the instruction of the received body side command signal 402 .

[0027] When the first control process 404 is completed, 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. Furthermore, when the signal level of the RDY(B) terminal is at a high level, the body side control unit 23 does not transmit or receive the body side data signal 406 or the lens side data signal 407.

[0028] 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. That is, 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 is a signal representing a control parameter of the body side command signal 402. For example, if the body side command signal 402 is a signal representing an instruction to drive the focus lens 36b, the corresponding body side data signal 406 is a signal representing the amount of drive of the focus lens 36b. Alternatively, the body side data signal 406 is a signal representing information (such as model information of the camera body) required by the lens side control unit 33 in command data communication.

[0029] Furthermore, when a 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. The lens side data signal 407, indicated by switching between high and low levels of DATAL in Fig. 3, is a signal that the lens side control unit 33 transmits to the body side control unit 23 by command data communication. For example, if the body side command signal 402 is a signal requesting model information of the interchangeable lens 3, the corresponding lens side data signal 407 is a signal indicating the model information of the interchangeable lens 3.

[0030] When the transmission of the lens side data signal 407 is completed, the lens side control unit 33 sets the signal level of the RDY(L) terminal to high level again (T4). The lens side control unit 33 starts a second control process 408 (described later) based on the instruction of the received body side data signal 406.

[0031] 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, a case will be described where the received body side command signal 402 requests specific information of the interchangeable lens 3. As the first control process 404, the lens side control unit 33 executes a process of generating 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.

[0032] For example, a case will be described where the received body-side command signal 402 is a signal instructing to drive the focus lens 36b. The lens-side control unit 33 executes, as a first control process 404, a process of generating a signal indicative of having received a signal instructing to drive the focus lens 36b. 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. The lens-side control unit 33 executes, as a second control process 408, a process of driving the lens by the drive amount designated in the body-side data signal 406.

[0033] When the second control process 408 is completed, the lens side control unit 33 sets the RDY(L) terminal to low level via the lens side communication unit 34 (T5).

[0034] The communications performed at the above-mentioned times T1 to T5 constitute one command data communication. In one command data communication, the body side control unit 23 transmits a body side command signal 402 and a body side data signal 406. That is, the body side command signal 402 and the body side data signal 406 together constitute one piece of control data.

[0035] As described above, the lens side control unit 33 receives control data from the body side control unit 23 and transmits response data to the body side communication unit 24 in parallel. In other words, command data communication is so-called full-duplex communication.

[0036] (Hotline communication explanation) Another communication system is communication in which data is transmitted unidirectionally from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2, and this is called hotline communication. Hotline communication is data communication performed between the body-side control unit 23 and the lens-side control unit 33 using the HCLK(B) terminal, the HCLK(L) terminal, the HDATA(B) terminal, and the HDATA(L) terminal via the body-side communication unit 24 and the lens-side communication unit 34. The body-side control unit 23 acquires information about the state of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 through hotline communication. Information about the state of the interchangeable lens 3 includes, for example, the position of the focus lens 36b, the position of the image stabilization lens (not shown), and the position of the aperture. The image stabilization lens is a member that can be moved (driven) to include a component in a direction perpendicular to the optical axis direction, and the aperture is a member 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 via command data communication, the lens side control unit 33 autonomously sends lens data to the body side control unit 23, regardless of (independently from) the command data communication, until an instruction to end communication is sent.

[0037] FIG. 4 is an example of a timing chart showing the timing of hotline communication. When the lens side control unit 33 receives a command to start hotline communication from the body side control unit 23 of the camera body by command data communication (T6), it performs a generation process 501. The generation process 501 is a process of acquiring the state of the lens at a sampling period of, for example, 1 millisecond, and generating a lens signal 503 for hotline communication. When the generation of the lens signal 503 is completed (T7), the lens side control unit 33 outputs a clock signal 502 from the HCLK(L) terminal via the lens side communication unit 34. That is, the clock signal 502 is transmitted to the body side control unit 23 via the HCLK(L) terminal and the HCLK(B) terminal. The frequency at which the high level and the low level of the clock signal 502 in FIG. 4 are repeated 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 data communication.

[0038] The lens side control unit 33 outputs the lens signal 503 (e.g., information on 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. That is, 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. The lens signal 503 indicated by switching between high and low levels of HDATA in Fig. 4 is a signal transmitted from the lens side control unit 33 to the body side control unit 23 by hotline communication. The output of the clock signal 502 and the lens signal 503 ends at timing T8. The lens side control unit 33 repeats transmission of lens data by hotline communication at regular intervals (for example, 1 millisecond) until an instruction to stop transmission of the lens signal 503 is received by command data communication.

[0039] It is possible for command data communication and hotline communication to be performed in part or in whole in parallel. That is, the body side control unit 23 and the lens side control unit 33 can start or end hotline communication while performing command data communication. It is also possible to start or end command data communication while performing hotline communication.

[0040] As described above, hotline communication is performed independently of command communication. The lens-side control unit 33 transmits information regarding the state of the interchangeable lens 3 to the body-side control unit 23 by hotline communication, regardless of command communication. Therefore, the body-side control unit 23 can continuously grasp the state of the interchangeable lens 3 even during command communication. Therefore, the body-side control unit 23 can continuously grasp the position of the focus lens 36b, and can control autofocus at high speed, for example. The same applies to image stabilization control and aperture control. Furthermore, the body side control unit 23 can issue various instructions to the interchangeable lens 3 through command communication at any timing, even while the lens side control unit 33 is performing hotline communication.

[0041] (Explanation of lens mount mechanism) The camera system 1 of this embodiment is equipped with a so-called bayonet-type lens mount mechanism. The body mount 21 of the camera body 2 and the lens mount 31 of the interchangeable lens 3 will be described below in order.

[0042] Fig. 5(a) is a diagram showing a schematic view of the mount of the camera body 2 as seen from the interchangeable lens 3 side. The camera body 2 has the body side mount 21 and the body side terminal holding portion 22 described above in Fig. 1. The body side mount 21 has an annular reference surface with a certain width. Furthermore, the body side mount 21 has a first body side claw portion 29a, a second body side claw portion 29b, a third body side claw portion 29c, and a fourth body side claw portion 29d. In the following description, these four claw portions are collectively referred to as body side claw portions 29.

[0043] The body side claws 29 are arranged at intervals from each other along the circular opening of the body side mount 21. As shown in Fig. 5(a), the first body side claw 29a is arranged at the upper right position, the second body side claw 29b at the upper left position, the third body side claw 29c at the lower left position, and the fourth body side claw 29d at the lower right position.

[0044] The circumferential lengths of the first body side claw portion 29a to the fourth body side claw portion 29d are different from one another. Specifically, the first body side claw portion 29a is the longest, the third body side claw portion 29c is the second longest, the fourth body side claw portion 29d is the third longest, and the second body side claw portion 29b is the shortest.

[0045] The body side claw portion 29 protrudes from the body side mount 21 toward the center of the opening, and there are portions on the circumference of the opening where the body side claw portion 29 is present and portions where the body side claw portion 29 is not present. In the following description, the space 40a between the body side first claw portion 29a and the body side fourth claw portion 29d on the circumference of the opening of the body side mount 21 is referred to as the body side first insertion / removal portion 40a. Similarly, the space 40b between the body side first claw portion 29a and the body side second claw portion 29b is referred to as the body side second insertion / removal portion 40b, the space 40c between the body side second claw portion 29b and the body side third claw portion 29c is referred to as the body side third insertion / removal portion 40c, and the space 40d between the body side third claw portion 29c and the body side fourth claw portion 29d is referred to as the body side fourth insertion / removal portion 40d. These four body side insertion / removal portions are collectively referred to as the body side insertion / removal portion 40.

[0046] A body-side terminal holding portion 22 is provided inside the opening of the body-side mount 21. The body-side terminal holding portion 22 has an arc shape corresponding to the shape of the annular body-side mount 21. The body-side terminal holding portion 22 is arranged in parallel with the opening of the body-side mount 21 at the top of the opening of the body-side mount 21, and is preferably arranged in the center of the top as shown in FIG. 5(a). The body-side terminal holding portion 22 has a plurality of body-side terminals as described above. The body-side terminals are arranged in a line in an arc shape on the body-side terminal holding portion 22 inside the body-side mount 21. The body-side terminals are eleven terminals arranged from the right side as shown in FIG. 5(a), including HDATA(B), HCLK(B), DATAL(B), CLK(B), DATAB(B), RDY(B), GND(B), V33(B), PGND(B), VBAT(B), and LDET(B) on the leftmost side. The body side terminals are each a conductive pin. The body side terminals are pushed in the -Z direction (Fig. 1) by a spring or the like (not shown). The -Z direction is the direction toward the interchangeable lens 3 attached to the camera, that is, the direction toward the subject.

[0047] The body side mount 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 body side fourth claw portion 29d. In other words, on the annular reference plane of the body side mount 21, the hole of the lock pin 42 is located between the area in the opening of the body side mount 21 where the body side fourth claw portion 29d exists and the area where the body side first claw portion 29a exists. The lock pin 42 is pressed in the −Z direction (FIG. 1) by a spring or the like (not shown).

[0048] FIG. 5(b) is a schematic diagram of the mount of the camera body 2 with the body side mount 21 removed, viewed from the interchangeable lens 3 side. A first leaf spring 41a is provided at a position corresponding to the body side first claw 29a (behind the body side first claw 29a). Similarly, a second leaf spring 41b is provided at a position corresponding to the body side second claw 29b (behind the body side second claw 29b), a third leaf spring 41c is provided at a position corresponding to the body side third claw 29c (behind the body side third claw 29c), and a fourth leaf spring 41d is provided at a position corresponding to the body side fourth claw 29d (behind the body side fourth claw 29d). In the following description, these four leaf springs are collectively referred to as leaf springs 41. The leaf spring 41 presses the lens side claw, which will be described later, in the +Z direction (toward the camera body 2).

[0049] FIG. 6 is a diagram showing a schematic view of the mount of the interchangeable lens 3 as seen from the camera body 2 side. The interchangeable lens 3 includes the lens side mount 31 and the lens side terminal holding portion 32 described above in FIG. 1. The lens side mount 31 has an annular reference surface having a certain width. When the interchangeable lens 3 is attached to the camera body 2, the annular reference surface of the lens side mount 31 comes into contact with the annular reference surface of the body side mount 21 described above. Furthermore, the lens side mount 31 has a cylindrical portion extending in the optical axis direction on its inner circumference. The lens side mount 31 has a lens side first claw portion 39a, a lens side second claw portion 39b, a lens side third claw portion 39c, and a lens side fourth claw portion 39d spaced apart from one another along the outer circumference of the cylindrical portion. In the following description, these four claw portions are collectively referred to as the lens side claw portion 39.

[0050] The lens side claws 39 are provided in a direction protruding from the outer periphery of the cylindrical part of the lens side mount 31 towards the outside of the mount (in a radial direction from the optical axis O). As shown in Fig. 6, the first lens side claw 39a is located at the upper left position, the second lens side claw 39b at the upper right position, the third lens side claw 39c at the lower right position, and the fourth lens side claw 39d at the lower left position. Behind the lens side claws 39 (the reference surface side of the lens side mount 31), there is a space into which the corresponding body side claws 29 enter when the interchangeable lens 3 is attached to the camera body 2.

[0051] A lens side terminal holding part 32 is provided inside the opening of the lens side mount 31. The lens side terminal holding part 32 has an arc shape corresponding to the shape of the ring-shaped lens side mount 31. The lens side terminal holding part 32 is arranged on the upper part of the lens side mount 31 in parallel with the opening of the lens side mount 31, and is preferably arranged in the center of the upper part as shown in FIG. 6. The lens side terminal holding part 32 has a plurality of lens side terminals as described above. The lens side terminals are arranged in a line on the lens side terminal holding part 32 in an arc shape on the inside of the lens side mount 31. The lens side terminals are arranged in eleven terminals, LDET(L), VBAT(L), PGND(L), V33(L), ​​GND(L), RDY(L), DATAB(L), CLK(L), DATAL(L), HCLK(L), and HDATA(L), from the right side as shown in FIG. 6. The lens side terminals are arranged such that the conductive contact surfaces are exposed toward the +Z direction (FIG. 1). The +Z direction is the direction in which subject light that has passed through the imaging optical system 36 travels toward the imaging element 27.

[0052] The lens side mount 31 has a lock pin receiving portion 43. The lock pin receiving portion 43 is located at the upper left of the lens side fourth claw portion 39d as shown in Fig. 6. In other words, the lock pin receiving portion 43 is located between a portion of the lens side mount 31 corresponding to the lens side first claw portion 39a and a portion corresponding to the lens side fourth claw portion 39d. The lock pin receiving portion 43 is a groove into which the lock pin 42 fits when the interchangeable lens 3 is attached to the camera body 2. This groove is provided facing in the -Z direction (Fig. 1).

[0053] When the interchangeable lens 3 is attached to the camera body 2, the multiple body side terminals come into physical contact with the multiple corresponding lens side terminals. This contact electrically connects the multiple body side terminals and the multiple lens side terminals. In other words, the multiple body side terminals and the multiple lens side terminals are electrically connected to each other.

[0054] (Installing interchangeable lenses) A method of mounting the interchangeable lens 3 on the camera body 2 will be described. When mounting the interchangeable lens 3 on the camera body 2, first, the body side mount 21 and the lens side mount 31 are opposed to each other, and the lens side first claw portion 39a is aligned with the position of the body side first insertion / removal portion 40a, the lens side second claw portion 39b is aligned with the position of the body side second insertion / removal portion 40b, the lens side third claw portion 39c is aligned with the position of the body side third insertion / removal portion 40c, and the lens side fourth claw portion 39d is aligned with the position of the body side fourth insertion / removal portion 40d. Then, the lens side first claw portion 39a is inserted into the body side first insertion / removal portion 40a, the lens side second claw portion 39b is inserted into the body side second insertion / removal portion 40b, the lens side third claw portion 39c is inserted into the body side third insertion / removal portion 40c, and the lens side fourth claw portion 39d is inserted into the body side fourth 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.

[0055] From this state, the interchangeable lens 3 is rotated in the mounting direction 44 shown in Figures 5 and 6. That is, the body side first claw 29a enters the space behind the lens side first claw 39a, the body side second claw 29b enters the space behind the lens side second claw 39b, the body side third claw 29c enters the space behind the lens side third claw 39c, and the body side fourth claw 29d enters the space behind the lens side fourth claw 39d. At this time, the lens side terminals come into contact with the body side terminals in order. Note that the camera body 2, rather than the interchangeable lens 3, may be rotated in the opposite direction to the mounting direction 44 shown in Figures 5 and 6.

[0056] When the lens side claws 39 are inserted into the corresponding body side insertion / removal parts 40 and rotated in the mounting direction 44, for example, the LDET(L) terminal 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 in that order. For example, the VBAT(L) terminal 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 in that order. For example, the PGND(L) terminal 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 in that order. For example, the V33(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, GND(B) terminal, and V33(B) terminal, in that order. For example, the GND(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, and GND(B) terminal, in that order.

[0057] For example, the RDY(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, and RDY(B) terminal, in that order. For example, the DATAB(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B), CLK(B), and DATAB(L) terminal, in that order. For example, the CLK(L) terminal contacts the HDATA(B) terminal, HCLK(B), DATAL(B), and CLK(B) terminal, in that order. For example, the DATAL(L) terminal contacts the HDATA(B) terminal, HCLK(B), and DATAL(B) terminal, in that order. For example, the HCLK(L) terminal contacts the HDATA(B) terminal, HCLK(B), and DATAL(B) terminal, in that order.

[0058] When the interchangeable lens 3 is rotated by a predetermined angle relative to the camera body 2, it reaches a mounting completion position. At the mounting completion position, the corresponding body side claw 29 and lens side claw 39 face each other in the optical axis direction, and the lock pin 42 is pushed in the -Z direction in FIG. 1 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 to remove it from the camera body 2. In other words, when the body side claw 29 and the lens side claw 39 reach a predetermined mounting completion position, the relative positions of the body side mount 21 and the lens side mount 31 are fixed. The lens side claw 39 is pushed toward the body side (+Z direction in FIG. 1) by the leaf spring 41. As a result, each of the multiple lens side terminals comes into contact with each of the multiple corresponding body side terminals, and is electrically connected.

[0059] In the following description, the state in which the body side claw 29 and the lens side claw 39 have reached a predetermined mounting completion position is referred to as the mounting completion state. The state in which the lens side claw 39 is rotating from the position inserted into the body side insertion / removal portion 40 to just before the mounting completion position, or the state in which it is rotating from just before the mounting completion position to the insertion position is referred to as the mounting in progress state.

[0060] In the attached state, the signal level of the LDET(B) terminal is pulled up and is at a high level. When the body side control unit 23 detects that the signal level of the LDET(B) terminal is at a high level, it determines that the interchangeable lens 3 is not attached. When the interchangeable lens 3 is not attached, the body side control unit 23 does not cause the power supply unit 26 to supply power to the VBAT(B) terminal and the V33(B) terminal.

[0061] In the attachment complete state, the signal level of the LDET(B) terminal is pulled down to a low level as described above (FIG. 2). When the body side control unit 23 detects that the signal level of the LDET(B) terminal has become low, it determines that the interchangeable lens 3 has been attached. In addition, in the attachment complete state, the lock pin 42 enters the lock pin receiving portion 43, and the switch 28 (FIG. 1) linked to the lock pin 42 is turned on. When the body side control unit 23 detects that the signal level of the LDET(B) terminal has become low and that the switch 28 has been turned on, it causes the power supply unit 26 to start supplying power to the V33(B) terminal. Note that the camera body 2 does not necessarily have to include the switch 28. If the camera body 2 does not include the switch 28, it is sufficient to cause the power supply unit 26 to start supplying power to the V33(B) terminal when it detects that the signal level of the LDET(B) terminal has become low.

[0062] When power supply to the V33(B) terminal is started, 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 starts operating. The lens side control unit 33 that has started operating permits initial communication with the body side control unit 23 by command data communication. After the lens side control unit 33 permits the initial communication, the body side control unit 23 starts the initial communication. The initial communication includes a signal requesting the lens side control unit 33 to supply power to the VBAT(L) terminal. When a signal requesting power supply 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, and initialization processing is performed between the camera body 2 and the interchangeable lens 3. In the initialization processing, information required for various operations of the camera system 1, such as shooting operations and focus adjustment operations, is exchanged between the camera body 2 and the interchangeable lens 3, and the lens position of the interchangeable lens is moved to a reference position.

[0063] When the user presses an unlock button (not shown) on the camera body in the attachment complete state, the lock pin 42 retracts from the lock pin receiving portion 43. This makes it possible to change the relative positions of the body side mount 21 and the lens side mount 31. When the user presses the unlock button (not shown), the body side control portion 23 turns off the switch 28 linked to the unlock button, causing the power supply portion 26 to stop supplying power to the VBAT(B) terminal and the V33(B) terminal. From this state, when the interchangeable lens 3 is rotated in the direction opposite to the attachment direction 44 shown in FIGS. 5 and 6, the multiple lens side terminals come into contact with the multiple body side terminals in the reverse order to that described above.

[0064] It is not necessary to stop the power supply in conjunction with the operation of the unlock button. In this case, when the body side control unit 23 detects that the LDET(L) terminal and the LDET(B) terminal are separated due to rotation of the interchangeable lens 3 in the direction opposite to the mounting direction 44 and the signal level of the LDET(B) terminal has changed from low level to high level, the body side control unit 23 causes the power supply unit 26 to stop the power supply to the VBAT(B) terminal and the V33(B) terminal. In this way, the number of parts of the camera system 1 can be reduced. Also, when the body side control unit 23 detects that the lock release button has been pressed and that the signal level of the LDET(B) terminal has changed from low level to high level, the body side control unit 23 causes the power supply unit 26 to stop the power supply to the VBAT(B) terminal and the V33(B) terminal. Alternatively, when it is detected that either the unlock button is pressed or the signal level of the LDET(B) terminal has changed from a low level to a high level, the body side control unit 23 may cause the power supply unit 26 to stop supplying power to the VBAT(B) terminal and the V33(B) terminal.

[0065] As explained above, when an interchangeable lens is being attached to or removed from a camera body (mounted state), the lens terminals come into contact with body terminals other than the corresponding terminals when attachment is complete. It is desirable for the arrangement of the lens terminals and body terminals to minimize problems caused by contact during attachment and removal.

[0066] (Noise-conscious terminal layout) In this embodiment, the LDET(B) terminal among the multiple body side terminals is disposed at the very end in the lens mounting direction (arrow 44 in FIG. 5(a)). That is, the arrangement position of the LDET(B) terminal is the leftmost of the group of body side terminals in FIG. 5(a) as described above. The LDET(L) terminal among the multiple lens side terminals is also disposed at the very end in the lens mounting direction (arrow 44 in FIG. 6). That is, the arrangement position of the LDET(L) terminal is the rightmost of the group of lens side terminals in FIG. 6 as described above. Therefore, the LDET(B) terminal does not come into contact with lens side terminals other than the LDET(L) terminal until the mounting of the mounted lens is completed. Therefore, the signal level of the LDET(B) terminal does not erroneously become low level during the process of mounting the interchangeable lens, and the lens mounting is not erroneously recognized.

[0067] In this embodiment, the VBAT(B) terminal is disposed next to the LDET(B) terminal, that is, the second from the front end in the mounting direction. The VBAT(L) terminal is disposed next to the LDET(L) terminal, that is, the second from the front end in the mounting direction. This is done in order to reduce the number of lens-side terminals that the VBAT(B) terminal on the camera body contacts during the lens mounting process. Since the voltage applied to the VBAT(B) terminal is higher than other terminals, if the VBAT(B) terminal contacts a terminal other than the VBAT(L) terminal under a situation in which a high voltage is mistakenly applied to the VBAT(B) terminal due to a failure of the camera system 1, this high voltage may place an unexpected load on the electric circuit in the interchangeable lens. In this embodiment, since the VBAT(B) terminal is located next to the LDET(B) terminal, only the LDET(L) terminal contacts the VBAT(B) terminal among the multiple lens-side terminals during mounting of the interchangeable lens 3. As shown in FIG. 2, the LDET(L) terminal is grounded via resistor R3, so that the camera system 1 is not affected even if a high voltage is applied from the VBAT(B) terminal.

[0068] In this embodiment, the PGND(B) terminal is disposed next to the VBAT(B) terminal, i.e., the third from the end in the mounting direction. The PGND(L) terminal is disposed next to the VBAT(L) terminal, i.e., the third from the end in the mounting direction. The high voltage supplied from the VBAT(B) terminal is charged in the capacitor C1 connected to the VBAT(L) terminal. When the interchangeable lens 3 is rotated in the direction to be removed, the VBAT(L) terminal first comes into contact with the PGND(B) terminal. The charge stored in the capacitor C1 is quickly discharged from the PGND(B) terminal, which is a ground terminal, and does not affect other circuits of the camera system 1.

[0069] In this embodiment, the V33(B) terminal is arranged next to the PGND(B) terminal, that is, the fourth terminal from the end in the mounting direction, and the GND(B) terminal is arranged next to that, that is, the fifth terminal from the end. The V33(L) terminal is arranged next to the PGND(L) terminal, that is, the fourth terminal from the end in the mounting direction, and the GND(L) terminal is arranged next to that, that is, the fifth terminal from the end. The voltage supplied from the V33(B) terminal is stored as a charge in the capacitor C2 connected to the V33(L) terminal. When the interchangeable lens 3 is rotated in the removal direction, the V33(L) terminal first comes into contact with the GND(B) terminal. The charge stored in the capacitor C2 is quickly discharged from the GND(B) terminal, which is a ground terminal, and does not affect other circuits of the camera system 1.

[0070] The RDY (B) terminal is placed next to the GND (B) terminal, i.e., the sixth terminal from the top, and next to that, i.e., the seventh terminal from the top, is the DATAB (B) terminal, and next to that, i.e., the eighth terminal from the top, is the CLK (B) terminal, and next to that, i.e., the ninth terminal from the top, is the DATAL (B) terminal, and next to that, i.e., the tenth terminal from the top, is the HCLK (B) terminal, and next to that, at the very back, is the HDATA (B) terminal.

[0071] The RDY (L) terminal is placed next to the GND (L) terminal, i.e., the sixth terminal from the top, and next to that, i.e., the seventh terminal from the top, is the DATAB (L) terminal, and next to that, i.e., the eighth terminal from the top, is the CLK (L) terminal, and next to that, i.e., the ninth terminal from the top, is the DATAL (L) terminal, and next to that, i.e., the tenth terminal from the top, is the HCLK (L) terminal, and next to that, at the very back, is the HDATA (L) terminal.

[0072] Next, the influence of noise on the communication line consisting of each body side terminal and each lens side terminal will be described. Hotline communication is a communication in which information is transmitted unilaterally to the body after the start of communication, and is performed frequently (repeated in a very short cycle). During hotline communication, a clock signal is sent from the HCLK(L) terminal to the HCLK(B) terminal. Since the clock signal is a signal that repeats high and low levels in a short cycle, it can be a large noise source for other signals. Furthermore, since the clock signal sent from the HCLK(L) terminal to the HCLK(B) terminal is a signal output from the interchangeable lens 3, even if noise is mistakenly added to the clock signal, the camera body 2 cannot recognize the noise. In this way, the signal flowing through the HCLK terminal may be a noise source for the camera body 2, and may cause a malfunction of the camera system 1. Examples of malfunctions include erroneous detection of attachment of an interchangeable lens and mistakenly determining whether command communication is possible. In this embodiment, the HCLK terminal is located away from the VBAT terminal to which a high voltage is applied. In addition, the HCLK terminal is placed away from the RDY terminal, which is used to indicate whether command communication is possible or not.

[0073] In addition, the HDATA and DATAL terminals are located on either side of the HCLK terminal, which makes it possible to reduce the effect of noise from the HCLK terminal on terminals other than the HDATA and DATAL terminals.

[0074] Next, command data communication is communication in which information is transmitted and received bidirectionally between the body and the interchangeable lens as described above. During command data communication, a clock signal is sent from the CLK(B) terminal to the CLK(L) terminal. The clock signal transmitted by the CLK terminal can also be a noise source for the same reason as described above. Therefore, in this embodiment, the CLK terminal is located away from the VBAT terminal to which a high voltage is applied. Also, the CLK terminal is located away from the RDY terminal used to indicate whether command communication is possible or not so as not to be adjacent to it. Also, if the HCLK terminal and the CLK terminal are located adjacent to each other, one clock signal may affect the other clock signal and become a noise source. In this embodiment, the DATAL terminal is located between the CLK terminal and the HCLK terminal. Also, the DATAB terminal is located between the CLK terminal and the RDY terminal. That is, the DATAL terminal and the DATAB terminal are located on both sides of the CLK terminal. This makes it possible to suppress the influence of noise caused by the CLK terminal on the camera system.

[0075] As described above, the level of the RDY terminal must be determined to communicate command data. That is, since the signal level of the RDY terminal indicates whether command data can be communicated or not, noise has a large effect on the shooting operation. Here, consider a case where the body side control unit 23 erroneously recognizes that command data can be communicated due to noise, even though command data cannot be communicated. In this case, the lens side control unit 33 cannot receive command data, but the body side control unit 23 transmits command data, and the body side control unit 23 erroneously recognizes that control according to the command data is performed on the interchangeable lens. However, since the lens side control unit 33 cannot accept command data, control according to the erroneously transmitted command data is not performed. This causes a problem in the operation of the camera system 1. Therefore, it is necessary to prevent noise from being carried on the signal of the RDY terminal. In order to prevent noise from being carried on the signal of the RDY terminal, it is desirable to arrange terminals on both sides of the RDY terminal through which a relatively stable signal, that is, a signal with little change in signal level per unit time, flows. In this embodiment, a GND terminal and a DATAB terminal are arranged on both sides of the RDY terminal. The GND terminal is stable because it is a terminal at ground potential, and the DATAB terminal is also a terminal through which a more stable signal flows than the CLK and HCLK terminals. This makes it possible to suppress the effects of noise on the RDY terminal signal.

[0076] Next, the power supplied from the VBAT(B) terminal to the VBAT(L) terminal is used to drive an actuator (such as a stepping motor) of the drive unit 37 of the interchangeable lens 3. Therefore, the current flowing through the VBAT terminal varies greatly between when the actuator is driven and when it is not driven. Such current fluctuations become a noise source for signals flowing through other terminals. In this embodiment, the VBAT terminal is located away from the RDY terminal, DATAB terminal, CLK terminal, and 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 located between the VBAT terminal and the terminals used for these communications. This suppresses the influence of noise caused by fluctuations in the current flowing through the VBAT terminal on data communication.

[0077] The above-described terminal arrangement taking noise into consideration will now be summarized. The RDY pin is placed away from the VBAT pin and the HCLK pin, which are noise sources, so that it is not adjacent to either pin. This helps to reduce the effects of noise on the RDY pin, which is used to indicate whether command communication is possible. The HCLK terminal, which is a noise source, is sandwiched between the HDATA and DATAL terminals, and the CLK terminal is sandwiched between the DATAL and DATAB terminals. In other words, from the rear end in the mounting direction, the terminals are arranged as follows: HDATA, HCLK, DATAL, CLK, and DATAB. This reduces the impact of noise caused by the clock signal on the RDY terminal and other terminals. Furthermore, in consideration of the effects of noise, the terminals for power supply and the terminals for communication are arranged apart, with the RDY terminal in between. More specifically, the VBAT, PGND, V33, and GND terminals for power supply are arranged in that order from the leading edge of the RDY terminal in the installation direction, and the DATAB, CLK, DATAL, HCLK, and HDATA terminals for communication are arranged in that order from the trailing edge of the installation direction. This makes it possible to suppress the effects of noise on the RDY terminal of the power supply terminals such as the VBAT terminal and the terminals used for communication such as the HCLK and CLK terminals.

[0078] Of the HCLK terminal through which a clock signal used for hotline communication is sent and the CLK terminal through which a clock signal used for command data communication is sent, the HCLK terminal is located farther from the VBAT terminal than the CLK terminal is. This is because, although the clock signal sent to the interchangeable lens at the CLK terminal is output by the body-side control unit 23 via the body-side communication unit 24, if noise is carried on the clock signal sent from the interchangeable lens to the camera body via the lens-side communication unit 34 via the HCLK(L) terminal, the body-side control unit 23 will misrecognize it, and therefore the noise carried on the clock signal at the HCLK terminal has a greater impact on the camera system 1. The HCLK terminal is located farther away from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is located between the GND terminal and the VBAT terminal. This makes it possible to shield the HCLK terminal, which sends the clock signal used for hotline communication, from noise originating from the VBAT terminal. The CLK terminal is positioned farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is placed between the GND terminal and the VBAT terminal. This makes it possible to shield the CLK terminal, which sends the clock signal used for command data communication, from noise caused by the VBAT terminal.

[0079] (Terminal arrangement considering wear) From here on, contacts of each terminal when attaching or detaching the interchangeable lens 3 to the camera body 2 will be described. When the interchangeable lens 3 is attached to the camera body 2, the body side terminals come into contact with the lens side terminals one after another. The same is true when the interchangeable lens 3 is removed from the camera body 2. That is, the body side terminals, which are pins protruding from the body side terminal holding portion 22, rub against the lens side terminals, which are exposed conductive contact surfaces, one after another. Since multiple interchangeable lenses are attached to and detached from one camera body, the body side terminals are more likely to wear out than the lens side terminals. In particular, the body side terminals located toward the rear end in the attachment direction of the interchangeable lens 3 are rubbed against a larger number of lens side terminals and experience more friction. Therefore, the body terminals located toward the rear end are more likely to wear out at the tips of the pins than the body side terminals located toward the front end. Wear of the body side terminals affects the contact with the lens side terminals, which may cause data communication to become unstable. In this embodiment, the LDET(B) terminal is located at the very end in the mounting direction, so the LDET(B) terminal is least worn. This ensures good contact between the LDET(B) terminal and the LDET(L) terminal, reducing the possibility of erroneous detection of attachment or detachment of the interchangeable lens 3.

[0080] As described above, in this embodiment, in order to suppress the influence of noise on communication, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position away from the VBAT(B) terminal. That is, the VBAT(B) terminal is arranged second from the front end side in the mounting direction, and the CLK(B) terminal and the HCLK(B) terminal are arranged at the rear end side away from the VBAT(B) terminal. Therefore, the CLK(B) terminal and the HCLK(B) terminal are more likely to wear out than the LDET(B) terminal and the VBAT(B) terminal. In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged close to the first body-side claw portion 29a. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged closer to the inner periphery of the first body-side claw portion 29a than the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner periphery of the body-side first claw 29a is shorter than the distance between the VBAT(B) terminal and the inner periphery of the body-side first claw 29a, and the distance between the HCLK(B) terminal and the inner periphery of the body-side first claw 29a is shorter than the distance between the VBAT(B) terminal and the inner periphery of the body-side first claw 29a. As described above, the first leaf spring 41a is located on the back side of the body-side first claw 29a, and the first leaf spring 41a presses the lens-side first claw 39a in the +Z direction (FIG. 1). Even from the perspective of the first leaf spring 41a, the distance between the CLK(B) terminal and the first leaf spring 41a and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the VBAT(B) terminal and the first leaf spring 41a. Similarly, the LDET(B) terminal is similar to the VBAT(B) terminal, and the distance between the CLK(B) terminal and the first leaf spring 41a and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the LDET(B) terminal and the first leaf spring 41a. As a result, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly against the lens side terminal than the VBAT(B) terminal and the LDET(B) terminal.

[0081] On the lens side, the CLK(L) terminal and the HCLK(L) terminal are also disposed closer to the inner periphery of the lens-side first claw 39a than the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner periphery of the lens-side first claw 39a is shorter than the distance between the VBAT(L) terminal and the inner periphery of the lens-side first claw 39a, and the distance between the HCLK(L) terminal and the inner periphery of the lens-side first claw 39a is shorter than the distance between the VBAT(L) terminal and the inner periphery of the lens-side first claw 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the lens-side first claw 39a are pressed against the corresponding body-side terminals by the first leaf spring 41a in the fully attached state. Similarly, the LDET(L) terminal is the same as the VBAT(L) terminal, and the distance between the CLK(L) terminal and the first leaf spring 41a and the distance between the HCLK(L) terminal and the first leaf spring 41a in the fully attached state are both shorter than the distance between the LDET(L) terminal and the first leaf spring 41a. As a result, the CLK(L) terminal and the HCLK(L) terminal exert a stronger force on the body side terminal than the LDET(L) terminal in the fully attached state. This allows good contact to be maintained even if the CLK(B) terminal and the HCLK(B) terminal wear out, stabilizing the clock signal and enabling stable data communication. For example, even if the camera body 2 or the interchangeable lens 3 receives an impact while the camera is still in the fully attached state, the contact between the CLK(B) terminal and the CLK(L) terminal and the contact between the HCLK(B) terminal and the HCLK(L) terminal are maintained.

[0082] Even if a part of the lens side first claw portion 39a is cut out, the whole including the protruding portion arranged in the area facing the body side first claw portion 29a and the cut out portion is the lens side first claw portion. As for the cut out method, the lens side claw portion may be cut out so as to divide the lens side claw portion into two or more in the circumferential direction, a part of the lens side claw portion may be cut out so as to be cut out, or at least a part of the lens side claw portion may be cut out so as to shorten the radial length. In addition, the circumferential length of the lens side claw portion may be changed within a range passing through the corresponding body side insertion / removal portion. The same applies to the lens side second claw portion 39b, the lens side third claw portion 39c, and the lens side fourth claw portion 39d. In addition, the radial thickness of the cylindrical portion may be changed as appropriate, and may be a shape in which at least a part of the cylindrical portion of this embodiment protrudes inward.

[0083] As described above, the CLK(B) terminal and the HCLK(B) terminal are more likely to wear out than the LDET(B) terminal and the VBAT(B) terminal. In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are disposed close to the body-side first claw portion 29a. That is, the CLK(B) terminal and the HCLK(B) terminal are disposed closer to the inner periphery of the body-side first claw portion 29a than the LDET(B) terminal and the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner periphery of the body-side first claw portion 29a is shorter than the distance between the LDET(B) terminal or the VBAT(B) terminal and the inner periphery of the body-side first claw portion 29a, and the distance between the HCLK(B) terminal and the inner periphery of the body-side first claw portion 29a is shorter than the distance between the LDET(B) terminal or the VBAT(B) terminal and the inner periphery of the body-side first claw portion 29a. As described above, the first leaf spring 41a is located on the back side of the body-side first claw 29a, and the first leaf spring 41a presses the lens-side first claw 39a in the +Z direction (FIG. 1). Even from the perspective of the first leaf spring 41a, the distance between the CLK(B) terminal and the first leaf spring 41a, and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the LDET(B) terminal or the VBAT(B) terminal and the first leaf spring 41a.

[0084] On the lens side, the CLK(L) terminal and the HCLK(L) terminal are also disposed closer to the inner peripheral edge of the lens-side first claw portion 39a than the LDET(L) terminal and the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner peripheral edge of the lens-side first claw portion 39a is shorter than the distance between the LDET(L) terminal or the VBAT(L) terminal and the inner peripheral edge of the lens-side first claw portion 39a, and the distance between the HCLK(L) terminal and the inner peripheral edge of the lens-side first claw portion 39a is shorter than the distance between the LDET(L) terminal or the VBAT(L) terminal and the inner peripheral edge of the lens-side first claw portion 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the lens-side first claw portion 39a are pressed against the corresponding body-side terminals by the first leaf spring 41a. As a result, the CLK(B) terminal and HCLK(B) terminal are pressed more strongly against the lens side terminals than the LDET(B) terminal and VBAT(B) terminal. This allows good contact to be maintained even if the CLK(B) terminal and HCLK(B) terminal wear out, ensuring stable communication. Also, for example, even if the camera body 2 or interchangeable lens 3 receives an impact while in the fully attached state, the CLK(B) terminal and HCLK(B) terminal maintain contact with the lens side terminals.

[0085] In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are also close to the body-side fourth claw 29d. That is, the CLK(B) terminal and the HCLK(B) terminal are disposed closer to the body-side fourth claw 29d than the VBAT(B) terminal and the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the body-side fourth claw 29d is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the body-side fourth claw 29d, and the distance between the HCLK(B) terminal and the body-side fourth claw 29d is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the body-side fourth claw 29d. As described above, the fourth leaf spring 41d is provided on the back side of the body-side fourth claw 29d, and the fourth leaf spring 41d presses the lens-side fourth claw 39d in the +Z direction (FIG. 1). Therefore, the CLK(B) terminal and the HCLK(B) terminal near the lens side fourth claw portion 39d are pressed more stably and strongly against the lens side terminal by the fourth leaf spring 41d than the VBAT(B) terminal and the LDET(B) terminal.

[0086] The distance between the CLK(B) terminal and the first body claw 29a (the same applies to the fourth body claw 29d, but will be omitted below) refers to the linear distance between one end of the first body claw 29a and the CLK(B) terminal, and may be defined as the linear distance between the other end of the first body claw 29a and the CLK(B) terminal. Alternatively, the distance between the CLK(B) terminal and the first body claw 29a may be defined as the linear distance between the middle position of the first body claw 29a in the circumferential direction of the body mount 21 and the CLK(B) terminal. The distance between the other body terminals, such as the HCLK(B) terminal, the VBAT(B) terminal, and the LDET(B) terminal, and the first body claw 29a is also a linear distance. The distance between the first leaf spring 41a (fourth leaf spring 41d) and the body terminal is also a linear distance.

[0087] The distance between the CLK(B) terminal and the first body claw 29a (the same applies to the fourth body claw 29d, but will be omitted below) may be defined as an arc-shaped distance between one end of the first body claw 29a and the CLK(B) terminal in the circumferential direction of the body mount 21, or may be defined as an arc-shaped distance between the other end of the first body claw 29a and the CLK(B) terminal. Alternatively, the distance between the CLK(B) terminal and the first body claw 29a may be defined as an arc-shaped distance between the middle position of the first body claw 29a in the circumferential direction of the body mount 21 and the CLK(B) terminal. The distance between the other body terminals, such as the HCLK(B) terminal, the VBAT(B) terminal, and the LDET(B) terminal, and the first body claw 29a is also an arc-shaped distance. The distance between the first leaf spring 41a (fourth leaf spring 41d) and the body terminal is also an arc-shaped distance.

[0088] The above description is for the camera body 2, but the same is true for the interchangeable lens 3. In this embodiment, the CLK(L) terminal and the HCLK(L) terminal are disposed close to the lens side first claw portion 39a. That is, the CLK(L) terminal and the HCLK(L) terminal are disposed closer to the lens side first claw portion 39a than the VBAT(L) terminal and the LDET(L) terminal. In other words, the distance between the CLK(L) terminal and the lens side first claw portion 39a is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the lens side first claw portion 39a, and the distance between the HCLK(L) terminal and the lens side first claw portion 39a is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the lens side first claw portion 39a. The lens side first claw portion 39a is pressed in the +Z direction (FIG. 1) by the first leaf spring 41a on the body side. Therefore, similarly to the above, the CLK(L) terminal and HCLK(L) terminal near the first lens claw portion 39a are pressed by the first leaf spring 41a more strongly against the body side terminal than the VBAT(L) terminal or LDET(L) terminal.

[0089] In this embodiment, as shown in Fig. 5(a), the CLK(B) terminal and the HCLK(B) terminal are disposed inside a sector (within a range of an angle of 50) formed by the center position of the opening of the mount 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped body-side first claw portion 29a. Alternatively, the CLK(B) terminal and the HCLK(B) terminal are disposed inside a triangular area formed by the center position of the opening of the mount 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and both ends of the inner circumference side of the body-side first claw portion 29a. Therefore, the body-side first claw portion 29a does not exist on the extension line of the dashed line 51 connecting the center position of the opening of the mount 21 and the LDET(B) terminal, but the body-side first claw portion 29a exists on the extension line of the dashed line 52 connecting the center position of the opening of the mount 21 and the HCLK(B) terminal, and the body-side first claw portion 29a exists on the extension line of the dashed line 53 connecting the center position of the opening of the mount 21 and the CLK(B) terminal. As a result, in the fully attached state, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly against the corresponding lens side terminal than the LDET(B) terminal.

[0090] 6, the CLK(L) terminal and the HCLK(L) terminal are disposed within a sector (within a range of an angle of 60) formed by the center position of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped lens-side first claw portion 39a. Alternatively, the CLK(L) terminal and the HCLK(L) terminal are disposed within a triangular area formed by the center position of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and both ends on the outer periphery side of the lens-side first claw portion 39a. Therefore, the lens-side first claw portion 39a does not exist on the extension line of the dashed line 61 connecting the center position of the opening of the mount 31 and the LDET(L) terminal, but the lens-side first claw portion 39a exists on the extension line of the dashed line 62 connecting the center position of the opening of the mount 31 and the HCLK(L) terminal, and the lens-side first claw portion 39a exists on the extension line of the dashed line 63 connecting the center position of the opening of the mount 31 and the CLK(L) terminal. As a result, in the fully attached state, the CLK(L) terminal and the HCLK(L) terminal make contact with the corresponding body side terminal more stably than the LDET(L) terminal. In other words, the CLK(L) terminal and the HCLK(L) terminal are pressed against the body side terminal with a stronger force than the LDET(L) terminal. Therefore, even if the tips of the CLK(B) terminal and the HCLK(B) terminal are worn, the communication of clock signals between the camera body 2 and the interchangeable lens 3 is stable.

[0091] The following modifications are also possible, and one or more of the modifications may be combined with the above-described embodiment. (Variation 1) Any of the terminals used for command data communication or hotline communication may also be provided with a function for transmitting a power-on signal from the interchangeable lens 3 to the camera body 2. For example, a power switch function is provided in the interchangeable lens 3. Even when the interchangeable lens 3 is in a fully attached state and the camera system 1 is in a power-off state, the power supply unit 26 supplies power to the lens side control unit 33 of the interchangeable lens 3 from the V33(B) terminal. 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. When the body side control unit 23 detects the power-on signal via the RDY(B) terminal via the body side communication unit 24, it transitions the camera system 1 from a power-off state to a power-on state in the same way as when a power switch (not shown) provided in the camera body 2 is operated.

[0092] (Variation 2) In the embodiment, the DATAB(B) terminal is disposed on the leading end side of the CLK(B) terminal in the mounting direction, and the DATAL(B) terminal is disposed on the trailing end side, but the positions of the DATAB(B) terminal and the DATAL(B) terminal may be interchanged. In other words, the DATAL(B) terminal, the CLK(B) terminal, and the DATAB(B) terminal may be disposed in this order from the leading end side in the mounting direction. In the above embodiment, the accessory is an interchangeable lens of a camera, but the accessory is not limited to an interchangeable lens. For example, the accessory may be a teleconverter, a wide converter, or a close-up ring that is attached between the camera body and the interchangeable lens to change the focal length of the interchangeable lens. Alternatively, the present invention may be applied to a mount adapter that allows an accessory including an interchangeable lens of a different mount standard to be attached to the mount standard of the camera body described above. In other words, the present invention may be applied to any accessory that is attached to the mount of the camera body. In that case, the lens side terminal group, the lens side claw portion 39, the lens side communication unit 34, etc. correspond to the accessory side terminal group, the accessory side protrusion, the accessory side communication unit, etc. of the respective accessories. In the above embodiment, the accessories are detachable from the camera body, but the above camera body may be a mount adapter that allows an interchangeable lens of the above mount standard to be attached to a camera body that has a different mount standard than the above, and the above accessory may be configured to be attached to the mount adapter. [Explanation of symbols]

[0093] 1... camera system, 2... camera body, 3... interchangeable lens, 21... body mount, 22... body terminal holder, 31... lens mount, 32... lens terminal holder

Claims

[Claim 1] An accessory to be attached to a camera body, the accessory having a camera-side first clock terminal for outputting a first clock signal, a camera-side first data terminal for outputting a first data signal, and a camera-side third data terminal for inputting a third data signal, The accessory includes: an eighth terminal in contact with the camera-side first clock terminal; a seventh terminal in contact with the camera-side first data terminal; a ninth terminal in contact with the camera-side third data terminal; The eighth terminal is disposed between the seventh terminal and the ninth terminal.

Images