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Abstract

The invention provides an accessory that can be attached to and detached from a camera body and has a plurality of terminals, the accessory including: a power terminal supplied with a first power supply voltage from the camera body; a ready terminal set to a high-level potential in a state in which communication with the camera body is not possible; a first clock terminal to which a first clock signal of a first period is input from the camera body; a first data terminal to which a first data signal is input from the camera body in accordance with the first clock signal; a second data terminal to which a second data signal is output to the camera body in accordance with the first clock signal; a second clock terminal to which a second clock signal of a second period is output to the camera body; and a third data terminal to which a third data signal is output to the camera body in accordance with the second clock signal, the second clock terminal being farther from the power terminal than the first clock terminal.

Description

[0001] This application is a divisional application of application number 201910643376.7, filed on July 17, 2019, entitled "Accessories". Technical Field

[0002] This invention relates to accessories. Background Technology

[0003] Accessories that can be attached to or detached from the camera body are known (e.g., Patent Document 1). In the past, accessories needed to be properly installed on the camera body in a usable state.

[0004] [Existing Technical Documents]

[0005] [Patent Documents]

[0006] [Patent Document 1]

[0007] Japanese Patent Application Publication No. 2004-117380 Summary of the Invention

[0008] According to the first technical solution, the accessory is detachable from the camera body and has multiple terminals, including: a detection terminal for the camera body to detect the attachment of the accessory; a first power terminal for receiving a first power voltage from the camera body; a second power terminal for receiving a second power voltage from the camera body; a ground terminal for grounding potential; a ready terminal for indicating whether communication with the camera body is possible; a first clock terminal for receiving a first clock signal of a first cycle from the camera body; a first data terminal for receiving a first data signal synchronized with the first clock signal from the camera body; and a second data terminal. A terminal for outputting a second data signal to the camera body in synchronization with the first clock signal; a second clock terminal for outputting a second clock signal of a second cycle to the camera body; a third data terminal for outputting a third data signal to the camera body in synchronization with the second clock signal; a first circuit section supplied with the first power supply voltage via the first power supply terminal; and a second circuit section supplied with the second power supply voltage via the second power supply terminal, the ground terminal serving as the ground potential for the first circuit section and the second circuit section, the distance between the second clock terminal and the first power supply terminal being longer than the distance between the first clock terminal and the first power supply terminal.

[0009] According to the second technical solution, the accessory is detachable from the camera body and has multiple terminals. The accessory includes: a detection terminal for the camera body to detect the attachment of the accessory; a power terminal for receiving a first power voltage from the camera body; a first ground terminal for grounding potential; a second ground terminal for grounding potential; a ready terminal for indicating whether communication with the camera body is possible; a first clock terminal for receiving a first clock signal of a first cycle from the camera body; a first data terminal for receiving a first data signal synchronized with the first clock signal from the camera body; and a second data terminal for outputting a second data signal synchronized with the first clock signal to the camera body. According to the signal; a second clock terminal, which outputs a second clock signal of the second cycle to the camera body; a third data terminal, which outputs a third data signal to the camera body synchronously with the second clock signal; a voltage conversion circuit, which converts the first power supply voltage into a second power supply voltage; a first circuit section, which is supplied with the first power supply voltage via the power supply terminal; and a second circuit section, which is supplied with the second power supply voltage obtained by the voltage conversion circuit, the first ground terminal is used as the ground potential of the first circuit section, the second ground terminal is used as the ground potential of the second circuit section, and the distance between the second clock terminal and the power supply terminal is longer than the distance between the first clock terminal and the power supply terminal.

[0010] According to the third technical solution, the accessory is detachable from the camera body and has multiple terminals, including: a detection terminal for the camera body to detect the attachment of the accessory; a power terminal for receiving a first power voltage from the camera body; a ground terminal for grounding potential; a ready terminal for indicating whether communication with the camera body is possible; a first clock terminal for receiving a first clock signal of a first cycle from the camera body; a first data terminal for receiving a first data signal synchronized with the first clock signal from the camera body; and a second data terminal for outputting a second data signal synchronized with the first clock signal to the camera body. According to the signal; a second clock terminal, which outputs a second clock signal of the second cycle to the camera body; a third data terminal, which outputs a third data signal to the camera body synchronously with the second clock signal; a voltage conversion circuit, which converts the first power supply voltage into a second power supply voltage; a first circuit section, which is supplied with the first power supply voltage via the power supply terminal; and a second circuit section, which is supplied with the second power supply voltage obtained by the voltage conversion circuit, the ground terminal serving as the ground potential for the first circuit section and the second circuit section, and the distance between the second clock terminal and the power supply terminal being longer than the distance between the first clock terminal and the power supply terminal. Attached Figure Description

[0011] Figure 1 It is a diagram that schematically illustrates the configuration of a camera system.

[0012] Figure 2 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the first embodiment.

[0013] Figure 3 This is a timing diagram illustrating an example of command-data communication.

[0014] Figure 4 This is a timing diagram illustrating an example of hotline communication.

[0015] Figure 5 It is a schematic front view showing the mounting surface of the camera body as seen from the lens replacement side.

[0016] Figure 6 It is a schematic front view showing the mounting surface of the interchangeable lens as seen from the side of the camera body.

[0017] Figure 7 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the second embodiment.

[0018] Figure 8 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the third embodiment.

[0019] Figure 9 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the fourth embodiment.

[0020] Figure 10 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the fifth embodiment.

[0021] Figure 11 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the sixth embodiment.

[0022] Figure 12 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the seventh embodiment.

[0023] Figure 13 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the eighth embodiment.

[0024] Figure 14 This is a circuit diagram schematically illustrating the electrical connection between the camera body and the interchangeable lens according to the ninth embodiment.

[0025] Explanation of reference numerals in the attached figures

[0026] 1…Camera system, 2…Camera body, 3…Lens replacement, 21…Body side mount, 22…Body side terminal holder, 31…Lens side mount, 32…Lens side terminal holder Detailed Implementation

[0027] (First Implementation)

[0028] Figure 1 This is a diagram showing an outline of the configuration of the camera system 1 according to the first embodiment. The camera system 1 includes a camera body 2 and an interchangeable lens 3, which is an example of an accessory that can be attached to or detached from the camera body 2.

[0029] The interchangeable lens 3 includes a lens-side mounting accessory 31, a lens-side terminal holder 32, a lens-side control unit 33 with a lens-side communication unit 34, a lens-side storage unit 35, an imaging optical system 36, and a drive unit 37. Details regarding the lens-side mounting accessory 31 and the lens-side terminal holder 32 will be described later.

[0030] The lens-side control unit 33 consists of a microcomputer and its peripheral circuitry. The lens-side communication unit 34 performs data communication with the camera body 2 (described later). The lens-side communication unit 34 is connected to the lens-side terminal assembly (described later) provided in the lens-side terminal holding unit 32. 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. Pre-stored control programs, etc., executed by the lens-side control unit 33 are stored in the lens-side storage unit 35. The lens-side control unit 33 controls the replacement of the lens 3 by reading the control program from the lens-side storage unit 35 and executing the program.

[0031] The imaging optical system 36 images the subject onto the imaging surface of the imaging element 27, which will be described later. The optical axis O of the imaging optical system 36 is approximately aligned with the center of the lens-side mount 31 and the body-side mount 21, which will be described later. Figure 1 The imaging optical system 36 generally includes a lens 36a, a focusing lens 36b, and a lens 36c. The focusing lens 36b is a lens used to adjust 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). The drive unit 37 drives the focusing lens 36b along the optical axis direction (+Z direction, -Z direction) using the actuator (not shown).

[0032] The camera body 2 includes a body-side mounting accessory 21, a body-side terminal holding part 22, a body-side control part 23 with a body-side communication part 24, a body-side storage part 25, a power supply part 26, an imaging element 27, and a switch 28 for detecting the status of the locking pin, which will be described later.

[0033] The body-side control unit 23 is composed of a microcomputer and its peripheral circuits. Furthermore, the body-side control unit 23 performs various controls on the camera body; however, in this invention, 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, as described later. The body-side communication unit 24 is connected to the body-side terminals (described later) provided in the body-side terminal holding unit 22. Furthermore, as described later, a portion of the terminals of the body-side terminal holding unit 22 is connected to the body-side control unit 23. 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 predetermined control programs, etc., 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.

[0034] The power supply unit 26 provides power to the camera body 2 and the interchangeable lens 3. The power supply unit 26 is connected to the body-side terminal group (described later) and the body-side control unit 23, which are located in the body-side terminal holding unit 22. The imaging element 27 is, for example, a solid-state imaging element such as a CCD or CMOS. The imaging element 27 is connected to the body-side control unit 23, and it captures images of the subject and outputs an imaging signal. The processing of the output imaging signal is omitted from the description.

[0035] Figure 2 This is a schematic circuit diagram illustrating the electrical connection between the camera body 2 and the interchangeable lens 3. The camera body-side terminal holding part 22 has LDET (B) terminal, VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, GND (B) terminal, RDY (B) terminal, DATAB (B) terminal, CLK (B) terminal, DATAL (B) terminal, HCLK (B) terminal, and HDATA (B) terminal. These 11 camera body-side terminals are collectively referred to as the camera body-side terminal group.

[0036] The LDET(B) terminal is used for the installation and removal detection of lens 3 during replacement. The LDET(B) terminal is connected to the body-side control unit 23 via resistor R2. A power supply V33 supplied from the power supply unit 26 is connected between resistor R2 and the body-side control unit 23 via resistor R1, and the LDET(B) terminal is pulled up.

[0037] The VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, and GND (B) terminal are terminals of the power supply system connected to the power supply unit 26. Figure 2In the diagram, arrows indicate the direction of the supplied power. The VBAT(B) terminal is used to supply power to the interchangeable lens 3. The drive unit 37 of the interchangeable lens 3 is driven using the power supplied via the VBAT(B) terminal. The operation of the drive unit 37 requires a larger voltage and current than the lens-side control unit 33, and the power supply voltage applied by the power supply unit 26 to the VBAT(B) terminal is at most 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. That is, the camera body 2 supplies the drive system power supply voltage to the interchangeable lens 3 from the VBAT(B) terminal. The PGND(B) terminal is the ground terminal corresponding to the VBAT(B) terminal and is used as the ground potential (ground part) of the drive system power supply voltage.

[0038] The V33(B) terminal is used to supply power to the interchangeable lens 3. The lens-side control unit 33 and other components are operated using the power supplied from the power supply unit 26 via the V33(B) terminal. Each part of the lens-side control unit 33 and other components operates with a voltage and current smaller than that of the drive unit 37. The voltage applied by the power supply unit 26 to the V33(B) terminal is at most 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. That is, the camera body 2 supplies the circuit system power supply voltage to the interchangeable lens 3 from the V33(B) terminal. The GND(B) terminal is the ground terminal corresponding to the V33(B) terminal and is used as the ground potential (grounding part) for the circuit system power supply voltage.

[0039] The RDY(B) terminal is connected to the fuselage-side communication unit 24. The DATAB(B), CLK(B), DATAL(B), HCLK(B), and HDATA(B) terminals are terminals of the communication system connected to the fuselage-side communication unit 24. The RDY(B), DATAB(B), CLK(B), and DATAL(B) terminals are used for command data communication as described later. Additionally, the HCLK(B) and HDATA(B) terminals are connected to the fuselage-side communication unit 24 and used for hot-wire communication as described later. Figure 2 Arrows indicate signal flow. The potential of the RDY (B) terminal indicates whether the interchangeable lens 3 can perform command data communication. The DATAB (B) terminal is the terminal that outputs data signals to the interchangeable lens 3. The CLK (B) terminal is the terminal that outputs clock signals (C clock signals) from the camera body 2 to the interchangeable lens 3.

[0040] The DATAL(B) terminal is the terminal into which data signals from the interchangeable lens 3 are input.

[0041] The HCLK (B) terminal is for receiving clock signals (H clock signals) from the interchangeable lens 3. The HDATA (B) terminal is for receiving data signals from the interchangeable lens 3.

[0042] The lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, an 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 attaching the replacement lens 3 to the camera body 2, if... Figure 2 As shown by the dashed lines, the body-side terminals and lens-side terminals are electrically connected. Specifically, an LDET(L) terminal is connected to the LDET(B) terminal, a VBAT(L) terminal is connected to the VBAT(B) terminal, a PGND(L) terminal is connected to the PGND(B) terminal, a V33(L) terminal is connected to the V33(B) terminal, a GND(L) terminal is connected to the GND(B) terminal, an RDY(L) terminal is connected to the RDY(B) terminal, a DATAB(L) terminal is connected to the DATAB(B) terminal, a CLK(L) terminal is connected to the CLK(B) terminal, a DATAL(L) terminal is connected to the DATAL(B) terminal, an HCLK(L) terminal is connected to the HCLK(B) terminal, and an HDATA(L) terminal is connected to the HDATA(B) terminal. Signals input to or output from each lens-side terminal correspond to the corresponding body-side terminal.

[0043] The LDET(L) terminal is used to detect the installation and removal of the interchangeable lens 3. The LDET(L) terminal is connected to ground (GND) via resistor R3. When the interchangeable lens 3 is attached to the camera body 2, the LDET(L) terminal is electrically connected to the LDET(B) terminal, and the LDET(B) terminal is pulled down. Thus, the camera body 2 can detect the presence of the interchangeable lens 3.

[0044] The VBAT (L) terminal, PGND (L) terminal, V33 (L) terminal, and GND (L) terminal are power system terminals that are electrically connected to the VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, and GND (B) terminal, respectively. Figure 2In the diagram, arrows indicate the direction of the supplied power. The drive unit 37 for the interchangeable lens 3 is driven using the power supplied via the VBAT(L) terminal. The PGND(L) terminal is the grounding terminal corresponding to the VBAT(L) terminal and is used as the ground potential (grounding part) for the power supply voltage of the drive system. A bypass capacitor C1 is connected between the VBAT(L) terminal and the PGND(L) terminal.

[0045] The V33(L) terminal is used to supply power to the interchangeable lens 3. The V33(L) terminal and the GND(L) terminal are connected to various parts of the lens-side control unit 33, etc. The lens-side control unit 33, etc., is operated using power supplied from the power supply unit 26 via the V33(B) terminal. The GND(L) terminal is the grounding terminal corresponding to the V33(B) terminal and is used as the ground potential (grounding part) for the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the V33(L) terminal and the GND(L) terminal.

[0046] The RDY(L) terminal is connected to the fuselage-side communication unit 24 via the RDY(B) terminal. The DATAB(L), CLK(L), DATAL(L), HCLK(L), and HDATA(L) terminals are respectively terminals of the communication system electrically connected to the DATAB(B), CLK(B), DATAL(B), HCLK(B), and HDATA(B) terminals. The RDY(L), DATAB(L), CLK(L), and DATAL(L) terminals are used for command data communication, as described later. Additionally, the HCLK(L) and HDATA(L) terminals are used for hot-wire communication, as described later.

[0047] The VBAT (L) and PGND (L) terminals are connected to the drive unit 37 via the lens-side control unit 33. The V33 (L) and GND (L) terminals are connected to various parts of the lens-side control unit 33, etc. The RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L) terminals are respectively connected to the lens-side communication unit 34.

[0048] (Explanation of command-data communication)

[0049] The transmission of control commands (commands) and control content (control data) from the fuselage-side control unit 23 to the lens-side control unit 33 of the lens replacement unit 3, and the transmission of response content (response data) and / or other data from the lens-side control unit 33 back to the fuselage-side control unit 23, is called command data communication. Command data communication is full-duplex communication. Command data communication is performed via digital data communication using RDY(B) terminals, RDY(L) terminals, DATAB(B) terminals, DATAB(L) terminals, CLK(B) terminals, CLK(L) terminals, DATAL(B) terminals, and DATAL(L) terminals via the fuselage-side communication unit 24 and the lens-side communication unit 34.

[0050] The camera body-side control unit 23, via the camera body-side communication unit 24 and the lens-side communication unit 34, sends various control commands and control content to the interchangeable lens 3 through command data communication, and receives response content and / or other data from the interchangeable lens 3, thereby transmitting and receiving various information with the interchangeable lens 3. The control commands mentioned here include, for example, commands to send lens information. The various information received from the interchangeable lens 3 includes, for example, camera model information of the interchangeable lens 3, and information indicating optical characteristics such as the focal length of the shooting optical system 36. The various information sent to the interchangeable lens 3 includes, for example, control commands such as lens drive instructions, control content such as lens drive amount, and camera body 2 model information. The control commands also include drive commands for the focusing lens 36b. The lens-side control unit 33 receives various control commands from the camera body-side control unit 23, obtains control content from the camera body-side control unit 23, and sends response content (e.g., information related to the execution status of initialization processes such as initialization in progress and initialization completion) to the camera body-side control unit 23 in response to initialization control commands from the camera body 2.

[0051] Figure 3 This is an example of a timing diagram representing the timing of command data communication. At the start of command data communication (T1), the fuselage-side control unit 23 first checks the signal level of the RDY(B) terminal. The signal level of the RDY(B) terminal indicates whether command data communication by the lens-side control unit 33 is possible. 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.

[0052] At the start of command data communication (T1), if the signal level of the RDY(B) terminal is low (L level), the body-side control unit 23 outputs a C clock signal 401 from the CLK(B) terminal via the body-side communication unit 24. That is, the body-side control unit 23 sends the C clock signal 401 to the lens-side control unit 33 via the CLK(B) terminal and the CLK(L) terminal. Figure 3 The frequency at which the C clock signal 401 repeatedly alternates between high and low levels is, for example, 8MHz. The body-side control unit 23 outputs a body-side command signal 402 as a control command from the DATAB (B) terminal in sync with the C clock signal 401. That is, the body-side control unit 23 sends 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 switching between high and low levels of the DATAB signal indicates that the camera-side command signal 402 is a signal indicating that the camera-side control unit 23 instructs the lens-side control unit 33 to control the camera via command data communication. For example, the camera-side command signal 402 could be a signal indicating a request to change lens 3, or a signal indicating an instruction to drive the focusing lens 36b. Figure 3 As shown, the timing of the command signal 402 sent from the camera body is different from the period of the C clock signal 401. In the case of initialization processing when the camera system 1 is powered on (power on) and / or termination processing when the power is disconnected, the command signal 402 is sent periodically at a minimum interval of about 8 milliseconds, but otherwise it is sent at arbitrary timing.

[0053] When the lens-side communication unit 34 receives the fuselage-side command signal 402, the lens-side control unit 33 uses the error detection code (e.g., checksum data) contained in the fuselage-side command signal 402 to perform a check for the presence or absence of communication errors in the fuselage-side command signal 402. Afterwards, the lens-side control unit 33 sets the signal level of the RDY (L) terminal to a high level (H level) (T2). When the signal level of the RDY (B) terminal is high, the fuselage-side control unit 23 does not transmit the C clock signal or the fuselage-side command signal 402.

[0054] Based on the instruction of the received command signal 402 from the body side, the lens-side control unit 33 starts the first control process 404.

[0055] 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) (T3) via the lens-side communication unit 34. When the signal level of the RDY(B) terminal is low, the body-side control unit 23 outputs a C clock signal 405 from the CLK(B) terminal. The frequency at which the C clock signal 405 alternates between high and low levels is the same as that of the C clock signal 401, for example, 8MHz. That is, the body-side control unit 23 sends the C clock signal 405 to the lens-side control unit 33 via the CLK(B) terminal and the CLK(L) terminal.

[0056] In addition, 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.

[0057] 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, synchronously with the C clock signal 405. That is, the body-side control unit 23 sends the body-side data signal 406 to the lens-side control unit 33 via the DATAB (B) and DATAB (L) terminals. The body-side data signal 406 is a signal indicating the control parameters of the body-side command signal 402. For example, if the body-side command signal 402 indicates an instruction to drive the focusing lens 36b, the corresponding body-side data signal 406 is a signal indicating the amount of drive of the focusing lens 36b. Alternatively, the body-side data signal 406 may be a signal indicating information required by the lens-side control unit 33 during command data communication (such as camera model information).

[0058] Additionally, when the C clock signal 405 is input to the CLK(L) terminal, the lens-side control unit 33 synchronously outputs the lens-side data signal 407 from the DATAL(L) terminal in sync with the C clock signal 405. Figure 3 The switching between high and low levels of DATAL indicates that the lens-side data signal 407 is a signal sent by 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 a request to replace lens 3, the corresponding lens-side data signal 407 is a signal indicating the model information for replacing lens 3. Figure 3 As shown, the timing of transmitting the body-side data signal 406 and the lens-side data signal 407 is different from the period of the C clock signal 405. In the case of initialization processing when the camera system 1 is powered on (power on) and / or termination processing when the power is disconnected, the body-side data signal 406 and the lens-side data signal 407 are transmitted periodically at a minimum interval of about 8 milliseconds, but otherwise, they are transmitted at arbitrary timings.

[0059] When the transmission of the lens-side data signal 407 is completed, the lens-side control unit 33 again sets 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 the second control process 408 (described later).

[0060] 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 the replacement of the lens 3 will be described. As the first control process 404, the lens-side control unit 33 performs the process of generating the requested information into a lens-side data signal 407. The lens-side data signal 407 generated by the first control process 404 is transmitted to the body-side communication unit 24 of the body-side control unit 23 via the lens-side communication unit 34, the DATAL (L) terminal, and the DATAL (B) terminal.

[0061] For example, the case where the received fuselage-side command signal 402 indicates an instruction to drive the focusing lens 36b will be described. As the first control process 404, the lens-side control unit 33 performs a process to generate a signal indicating that an instruction to drive the focusing lens 36b has been received. The signal generated by the first control process 404, as a lens-side data signal 407, is transmitted to the fuselage-side communication unit 24 of the fuselage-side control unit 23 via the lens-side communication unit 34, the DATAL (L) terminal, and the DATAL (B) terminal. As the second control process 408, the lens-side control unit 33 performs a process to drive the lens 36b according to the drive amount specified by the fuselage-side data signal 406.

[0062] When the second control process 408 is completed, the lens-side control unit 33 sets the RDY(L) terminal to a low level (T5) via the lens-side communication unit 34.

[0063] The communication performed during the aforementioned timings T1 to T5 constitutes a single command-data communication. In a single command-data communication, the fuselage-side control unit 23 sends a fuselage-side command signal 402 and a fuselage-side data signal 406. That is, the fuselage-side command signal 402 and the fuselage-side data signal 406 together constitute a control instruction (command) and control content (control data).

[0064] As described above, the lens-side control unit 33 performs the following in parallel: receiving control commands (commands) and control content (control data) from the body-side control unit 23, and sending response content (response data) to the body-side communication unit 24. That is, the command data communication is a so-called full-duplex communication.

[0065] (Explanation of hotline communication)

[0066] As another communication system, there exists a one-way (unidirectional) data transmission from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2, referred to as hot-wire communication. Hot-wire communication is the following: 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 HCLK(B), HCLK(L), HDATA(B), and HDATA(L) terminals. The body-side control unit 23 obtains information related to the state of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 through hot-wire communication. Information related to the state of the interchangeable lens 3 includes, for example, the position of the focusing lens 36b, the position of the image-correcting lens (not shown), and the driving position of the aperture blades. Furthermore, the image-correcting lens is a component capable of moving (driving) in a direction including a component perpendicular to the optical axis, and the aperture is a component capable of moving (driving) in a way that changes the size of the opening through which the light beam passes. The hotline communication is as follows: when the camera body sends an instruction to start communication via command data communication, the lens-side control unit 33 independently sends lens data to the body-side control unit 23 without the command data communication until an instruction to end communication is sent.

[0067] Figure 4 This is an example of a timing diagram representing the timing of hot-wire communication. When the lens-side control unit 33 receives a command to start hot-wire communication from the camera body-side control unit 23 via command data communication (T6), it performs a generation process 501. The generation process 501, for example, involves acquiring the lens state with a sampling period of 1 millisecond and generating a lens signal 503 for hot-wire communication. When the generation of the lens signal 503 is complete (T7), the lens-side control unit 33 outputs an H clock signal 502 from the HCLK(L) terminal via the lens-side communication unit 34. That is, the H clock signal 502 is sent to the camera body-side control unit 23 via the HCLK(L) and HCLK(B) terminals. Figure 4 The frequency at which the H clock signal 502 repeatedly alternates between high and low levels is, for example, 2.5MHz to 8MHz. That is, the frequency of the H clock signal 502 for hot-wire communication can be the same as or lower than the frequency of the C clock signal 401 for command data communication. In other words, the period of the H clock signal 502 for hot-wire communication can be the same as or longer than the period of the C clock signal 401 for command data communication.

[0068] The lens-side control unit 33 outputs the lens signal 503 (e.g., information related to the position of the focusing lens 36b) generated by the generation process 501 from the HDATA (L) terminal via the lens-side communication unit 34, synchronized with the H clock signal 502. That is, the lens-side control unit 33 transmits the lens signal 503 to the fuselage-side communication unit 24 of the fuselage-side control unit 23 via the lens-side communication unit 34, the HDATA (L) terminal, and the HDATA (B) terminal. Figure 4 The switching between high and low levels of HDATA indicates that lens signal 503 is a signal sent by lens-side control unit 33 to body-side control unit 23 via hot-wire communication. H clock signal 502 and lens signal 503 are output at the end of timing T8.

[0069] The lens-side control unit 33 repeatedly transmits lens data based on hot-wire communication at regular intervals (e.g., 1 millisecond) until it receives a transmission stop instruction from the lens signal 503 via command data communication. Figure 4 As shown, the timing of transmitting lens data via hot-wire communication differs from the period of the H clock signal 502. The transmission interval of lens data based on hot-wire communication is shorter than the transmission and reception interval of control commands (commands) and control content (control data) based on the aforementioned command data communication.

[0070] Command data communication and hot-line communication can be performed in parallel, either partially or entirely. That is, the fuselage-side control unit 23 and the lens-side control unit 33 can both initiate and terminate hot-line communication while conducting command data communication. Furthermore, command data communication can be initiated and terminated while conducting hot-line communication.

[0071] As explained above, hot-wire communication and command communication are conducted independently. The lens-side control unit 33 sends information related to the status of lens 3 replacement to the body-side control unit 23 via hot-wire communication, independent of command communication. Therefore, even during command communication, the body-side control unit 23 can continue to monitor the status of lens 3 replacement. Thus, since the body-side control unit 23 can continue to monitor the position of the focusing lens 36b, high-speed autofocus control is possible, for example. The same applies to hand shake correction control and / or aperture control.

[0072] Furthermore, even while the lens-side control unit 33 is conducting hot-line communication, the body-side control unit 23 can issue various instructions to the lens replacement unit 3 at any time via command communication.

[0073] (Explanation of lens assembly mechanism)

[0074] The camera system 1 of this embodiment has a so-called bayonet-type lens mounting mechanism. Hereinafter, the body-side mounting accessory 21 of the camera body 2 and the lens-side mounting accessory 31 of the interchangeable lens 3 will be described in turn.

[0075] Figure 5 (a) is a schematic diagram showing the assembly of the camera body 2 as viewed from the side of the interchangeable lens 3. The camera body 2 is equipped with... Figure 1 The fuselage-side mounting part 21 and the fuselage-side terminal holding part 22 are described herein. The fuselage-side mounting part 21 has an annular reference surface, which has a certain width. Furthermore, the fuselage-side mounting part 21 has a fuselage-side first claw part 29a, a fuselage-side second claw part 29b, a fuselage-side third claw part 29c, and a fuselage-side fourth claw part 29d. In the following description, these four claw parts will be collectively referred to as fuselage-side claw parts 29.

[0076] The side claws 29 are arranged spaced apart from each other along the circular opening of the side mounting fitting 21. For example... Figure 5 As shown in (a), the first claw 29a on the fuselage side is positioned at the upper right, the second claw 29b on the fuselage side is positioned at the upper left, the third claw 29c on the fuselage side is positioned at the lower left, and the fourth claw 29d on the fuselage side is positioned at the lower right.

[0077] The circumferential lengths of the first claw portion 29a to the fourth claw portion 29d on the fuselage side are different. Specifically, the first claw portion 29a on the fuselage side is the longest, the third claw portion 29c on the fuselage side is the second longest, the fourth claw portion 29d on the fuselage side is the third longest, and the second claw portion 29b on the fuselage side is the shortest.

[0078] The fuselage-side claw 29 protrudes from the fuselage-side mounting accessory 21 toward the center of the opening. There are portions with and without the fuselage-side claw 29 on the circumference of the opening. In the following description, the space 40a between the first fuselage-side claw 29a and the fourth fuselage-side claw 29d on the circumference of the opening of the fuselage-side mounting accessory 21 is referred to as the first fuselage-side insertion / removal portion 40a. Similarly, the space 40b between the first fuselage-side claw 29a and the second fuselage-side claw 29b is referred to as the second fuselage-side insertion / removal portion 40b, the space 40c between the second fuselage-side claw 29b and the third fuselage-side claw 29c is referred to as the third fuselage-side insertion / removal portion 40c, and the space 40d between the third fuselage-side claw 29c and the fourth fuselage-side claw 29d is referred to as the fourth fuselage-side insertion / removal portion 40d. These four fuselage-side insertion / removal portions are collectively referred to as the fuselage-side insertion / removal portions 40.

[0079] A fuselage-side terminal holding portion 22 is provided inside the opening of the fuselage-side fitting 21. The fuselage-side terminal holding portion 22 has an arc-shaped form corresponding to the shape of the annular fuselage-side fitting 21. The fuselage-side terminal holding portion 22 is arranged parallel to the opening of the fuselage-side fitting 21 at the upper part of the opening, preferably as follows: Figure 5 As shown in (a), it is positioned at the center of the upper part. The fuselage-side terminal holding part 22, as described above, has multiple fuselage-side terminals. These multiple fuselage-side terminals are arranged in a row and in an arc shape inside the fuselage-side mounting part 21. Regarding the multiple fuselage-side terminals, as... Figure 5 As shown in (a), from right to left, HDATA(B), HCLK(B), DATAL(B), CLK(B), DATAB(B), RDY(B), GND(B), V33(B), PGND(B), VBAT(B) are configured, with LDET(B) configured on the far left. These 11 terminals are configured. The fuselage-side terminal groups are conductive pins. The fuselage-side terminal groups are oriented towards the -Z direction by springs (not shown). Figure 1 ) Push. -Z direction is the direction of the subject being photographed, that is, the direction towards the interchangeable lens 3 attached to the camera.

[0080] The fuselage-side mounting component 21 has a hole through which a locking pin 42 passes. This hole is located on the upper right of the fourth claw portion 29d on the fuselage side. Specifically, on the annular reference surface of the fuselage-side mounting component 21, the hole for the locking pin 42 is positioned within the opening of the fuselage-side mounting component 21 between the area containing the fourth claw portion 29d and the area containing the first claw portion 29a on the fuselage side. The locking pin 42 is oriented towards the -Z direction by a spring (not shown) or similar means. Figure 1 )Push.

[0081] Figure 5 (b) is a schematic diagram of the camera body 2 after the body-side accessory 21 has been removed, viewed from the lens replacement 3 side. A first leaf spring 41a is installed at the position corresponding to the first claw 29a on the body side (inside the first claw 29a on the body side). Similarly, a second leaf spring 41b is installed at the position corresponding to the second claw 29b on the body side (inside the second claw 29b on the body side), a third leaf spring 41c is installed at the position corresponding to the third claw 29c on the body side (inside the third claw 29c on the body side), and a fourth leaf spring 41d is installed at the position corresponding to the fourth claw 29d on the body side (inside the fourth claw 29d on the body side). 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 (camera body 2 side).

[0082] Figure 6This diagram schematically illustrates the assembly of the interchangeable lens 3 as viewed from the sides of the camera body. The interchangeable lens 3 is equipped with... Figure 1 The lens-side mounting part 31 and the lens-side terminal holding part 32 are described herein. The lens-side mounting part 31 has an annular reference surface with a certain width. When the replacement 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 aforementioned body-side mounting part 21. Furthermore, the lens-side mounting part 31 has a cylindrical portion extending along the optical axis on its inner periphery. The lens-side mounting part 31 has a first lens-side claw 39a, a second lens-side claw 39b, a third lens-side claw 39c, and a fourth lens-side claw 39d spaced apart from each other along the outer periphery of its cylindrical portion. In the following description, these four claws are collectively referred to as the lens-side claws 39.

[0083] The lens-side claw 39 is positioned in a direction that protrudes from the outer periphery of the cylindrical portion of the lens-side mounting accessory 31 toward the outer side of the mounting (in the direction radiating from the optical axis O). For example... Figure 6 As shown, the first lens-side claw 39a is positioned at the upper left, the second lens-side claw 39b at the upper right, the third lens-side claw 39c at the lower right, and the fourth lens-side claw 39d at the lower left. On the rear side of the lens-side claws 39 (the reference surface side of the lens-side mounting accessory 31), there is space for the corresponding body-side claws 29 to enter when the interchangeable lens 3 is attached to the camera body 2.

[0084] A lens-side terminal holding portion 32 is provided inside the opening of the lens-side fitting 31. The lens-side terminal holding portion 32 has an arc-shaped form corresponding to the shape of the annular lens-side fitting 31. The lens-side terminal holding portion 32 is arranged parallel to the opening of the lens-side fitting 31 on the upper part of the lens-side fitting 31. Preferably, as shown... Figure 6 As shown, it is positioned at the center of the upper part. The lens-side terminal holding part 32, as described above, has multiple lens-side terminals. These multiple lens-side terminals are arranged in a row and in an arc shape inside the lens-side mounting part 32. Regarding the multiple lens-side terminals, as... Figure 6 As shown, starting from the right, there are 11 terminals: LDET(L), VBAT(L), PGND(L), V33(L), ​​GND(L), RDY(L), DATAB(L), CLK(L), DATAL(L), HCLK(L), and HDATA(L). The lens-side terminal group is configured such that the conductive contact surfaces of each terminal face the +Z direction. Figure 1 The +Z direction is the direction in which the light from the subject after passing through the imaging optical system 36 is directed toward the imaging element 27.

[0085] The lens side mounting accessory 31 has a locking pin receiving part 43. For example... Figure 6 As shown, the locking pin receiving portion 43 is located at the upper left of the fourth claw portion 39d on the lens side. That is, the locking pin receiving portion 43 is located 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 in the lens-side mounting accessory 31. The locking pin receiving portion 43 is a groove for receiving the locking pin 42 when the interchangeable lens 3 is attached to the camera body 2. This groove faces the -Z direction (…). Figure 1 ) location settings.

[0086] When the interchangeable lens 3 is attached to the camera body 2, multiple body-side terminals physically contact their corresponding lens-side terminals. Through this contact, the multiple body-side terminals and the multiple lens-side terminals are electrically connected. That is, the multiple body-side terminals and the multiple lens-side terminals are electrically conductive.

[0087] (Attachment for changing lenses)

[0088] The method for attaching the interchangeable lens 3 to the camera body 2 is explained below. When attaching the interchangeable lens 3 to the camera body 2, firstly, align the body-side mounting accessory 21 with the lens-side mounting accessory 31, and align the first lens-side claw 39a with the first body-side insertion / removal part 40a, the second lens-side claw 39b with the second body-side insertion / removal part 40b, the third lens-side claw 39c with the third body-side insertion / removal part 40c, and the fourth lens-side claw 39d with the fourth body-side insertion / removal part 40d. Then, insert the first lens-side claw 39a into the first body-side insertion / removal part 40a, the second lens-side claw 39b into the second body-side insertion / removal part 40b, the third lens-side claw 39c into the third body-side insertion / removal part 40c, and the fourth lens-side claw 39d into the fourth body-side insertion / removal part 40d. At this time, the LDET (L) terminal is in contact with the CLK (B) terminal, the VBAT (L) terminal is in contact with the DATAL (B) terminal, the PGND (L) terminal is in contact with the HCLK (B) terminal, and the V33 (L) terminal is in contact with the HDATA (B) terminal.

[0089] From this state onwards, change lens 3 along... Figure 5 as well as Figure 6 The mounting direction 44 is rotated as shown. That is, the first claw 29a on the body side enters the space inside the first claw 39a on the lens side, the second claw 29b on the body side enters the space inside the second claw 39b on the lens side, the third claw 29c on the body side enters the space inside the third claw 39c on the lens side, and the fourth claw 29d on the body side enters the space inside the fourth claw 39d on the lens side. At this time, multiple lens-side terminals sequentially contact multiple body-side terminals. Alternatively, the camera body 2 can be rotated along the mounting direction 44 without rotating the replacement lens 3. Figure 5 as well as Figure 6 Rotate in the opposite direction to the mounting direction 44 shown.

[0090] When the lens-side claw 39 is inserted into the corresponding body-side insertion / removal part 40 and rotated in the mounting 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, terminal V33 (L) is sequentially connected to terminals HDATA (B), HCLK (B), DATAL (B), CLK (B), DATAB (B), RDY (B), GND (B), and V33 (B). Similarly, terminal GND (L) is sequentially connected to terminals HDATA (B), HCLK (B), DATAL (B), CLK (B), DATAB (B), RDY (B), and GND (B).

[0091] For example, the RDY (L) terminal is sequentially contacted with the HDATA (B) terminal, HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, and RDY (B) terminal. For example, the DATAB (L) terminal is sequentially contacted with the HDATA (B) terminal, HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, and DATAB (B) terminal. For example, the CLK (L) terminal is sequentially contacted with the HDATA (B) terminal, HCLK (B) terminal, DATAL (B) terminal, and CLK (B) terminal. For example, the DATAL (L) terminal is sequentially contacted with the HDATA (B) terminal, HCLK (B) terminal, and DATAL (B) terminal. For example, the HCLK (L) terminal is sequentially contacted with the HDATA (B) terminal and HCLK (B) terminal.

[0092] When the interchangeable lens 3 is rotated relative to the camera body 2 by a predetermined angle, the mounting is completed. In the mounted position, the corresponding body-side claw 29 and lens-side claw 39 are aligned along the optical axis, and the locking pin 42 is engaged. Figure 1The locking pin 42 is pushed into the locking pin receiving part 43 in the -Z direction. When the locking pin 42 enters the locking pin receiving part 43, the replacement lens 3 cannot be rotated relative to the camera body 2 for disassembly. That is, when the body-side claw 29 and the lens-side claw 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 39 is pushed towards the body side by the leaf spring 41 ( Figure 1 (Push in the +Z direction). As a result, each of the multiple lens-side terminals contacts and electrically connects with each of the corresponding multiple body-side terminals.

[0093] In the following description, the state in which the body-side claw 29 and the lens-side claw 39 reach the predetermined attachment completion position is referred to as the attachment completion state. The state in which the lens-side claw 39 is rotated from the position where it is inserted into the body-side insertion / removal part 40 to the position just before reaching the attachment completion position, or the state in which the lens-side claw 39 is rotated from the position just before reaching the attachment completion position to the insertion position, is referred to as the attachment in progress state.

[0094] When the lens is in the mounting state, the signal level of the LDET(B) terminal is pulled up to a high level. When the high level of the LDET(B) terminal signal is detected, the body-side control unit 23 determines that the replacement lens 3 is not mounted. When the replacement lens 3 is not mounted, 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.

[0095] When the assembly is complete, as described above ( Figure 2 In this way, the signal level of the LDET(B) terminal is pulled down to a low level. When the signal level of the LDET(B) terminal is detected to be low, the body-side control unit 23 determines that the replacement lens 3 is installed. In addition, in the installed state, the locking pin 42 enters the locking pin receiving part 43, and the switch 28 (linked with the locking pin 42) Figure 1 The switch 28 is activated. When the signal level of the LDET(B) terminal is detected to be low and the switch 28 is activated, the body-side control unit 23 causes the power supply unit 26 to start supplying power to the V33(B) terminal, i.e., the power supply unit 26 supplies the power supply voltage of the circuit system. Furthermore, the camera body 2 may not necessarily have a switch 28. In the absence of a switch 28, the power supply unit 26 can simply start supplying power to the V33(B) terminal at the moment when the signal level of the LDET(B) terminal is detected to be low.

[0096] When power supply to terminal V33(B) is initiated, power voltage is supplied to the lens-side control unit 33 of the interchangeable lens 3 via terminal V33(L), ​​and the lens-side control unit 33 begins operation. After operation begins, the lens-side control unit 33 allows initial communication based on command data communication with the body-side control unit 23. After the lens-side control unit 33 allows initial communication, the body-side control unit 23 begins initial communication. The initial communication includes a signal from the lens-side control unit 33 requesting power supply to terminal VBAT(L). When the signal requesting power supply to terminal VBAT(L) is sent from the lens-side control unit 33 to the body-side control unit 23, the body-side control unit 23 supplies power voltage to terminal VBAT(B) to perform initialization processing between the camera body 2 and the interchangeable lens 3. During initialization processing, information required for various actions of the camera system 1, such as shooting actions and / or focus adjustment actions, 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.

[0097] When the mounting is complete, when the user presses the lock release button (not shown) on the camera body, the locking pin 42 retracts from the locking pin receiving part 43. This changes the relative position of the body-side mounting part 21 and the lens-side mounting part 31. When the user presses the lock release button (not shown), the switch 28 linked to the lock release button is disconnected, 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, the lens replacement 3 is moved towards the... Figure 5 as well as Figure 6 When rotated in the opposite direction to the mounting direction 44 shown, the multiple lens-side terminals contact the multiple body-side terminals in the reverse order as described above.

[0098] Furthermore, power supply can be stopped without being linked to the operation of the lock release button. In this case, the body-side control unit 23 rotates in the opposite direction to the mounting direction 44 of the interchangeable lens 3, causing the LDET (L) terminal to separate from the LDET (B) terminal. When the signal level of the LDET (B) terminal changes from low to high, the power supply unit 26 stops supplying power to the VBAT (B) and V33 (B) terminals. This reduces the number of components in the camera system 1. Alternatively, the power supply unit 26 can stop supplying power to the VBAT (B) and V33 (B) terminals when both the lock release button is pressed and the signal level of the LDET (B) terminal changes from low to high. Or, the body-side control unit 23 can stop supplying power to the VBAT (B) and V33 (B) terminals when either the lock release button is pressed or the signal level of the LDET (B) terminal changes from low to high.

[0099] As explained above, during the installation and removal of the lens from the camera body (in the attachment state), the lens-side terminals may come into contact with the body-side terminals other than those that should correspond upon completion of installation. Preferably, the arrangement of the lens-side and body-side terminals minimizes any undesirable situations arising from this contact during installation and removal.

[0100] (Terminal configuration considering noise)

[0101] In this embodiment, the LDET(B) terminal among the multiple body-side terminals is positioned in the lens mounting direction. Figure 5 (a) The foremost point of arrow 44). That is, as described above, the LDET(B) terminal is positioned as follows: Figure 5 (a) The leftmost terminal of the body-side terminal group. The LDET (L) terminal among the multiple lens-side terminals is also similarly positioned in the lens mounting direction. Figure 6 The foremost point of arrow 44). That is, as described above, the LDET (L) terminal is positioned as follows: Figure 6 The LDET(B) terminal is located on the far right side of the lens-side terminal assembly. Therefore, until the lens is fully attached, the LDET(B) terminal will not come into contact with any lens-side terminals other than the LDET(L) terminal. Thus, during lens replacement, the signal level of the LDET(B) terminal will not erroneously go low, preventing incorrect lens attachment identification.

[0102] In this embodiment, the VBAT(B) terminal is positioned next to the LDET(B) terminal, that is, at the second position from the foremost point in the mounting direction. The VBAT(L) terminal is also positioned next to the LDET(L) terminal, that is, at the second position from the foremost point in the mounting direction. This is to reduce the number of lens-side terminals that the VBAT(B) terminal on the camera body side contacts during lens mounting. Since the power supply voltage applied to the VBAT(B) terminal is 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, and the VBAT(B) terminal contacts a terminal other than the VBAT(L) terminal, this high voltage may impose an unexpected load on the circuitry within the replacement lens. In this embodiment, since the VBAT(B) terminal is located next to the LDET(B) terminal, during the mounting of the replacement lens 3, only the LDET(L) terminal will uniquely contact the VBAT(B) terminal among the multiple lens-side terminals. Figure 2 As shown, the LDET (L) terminal is grounded via resistor R3, so even if a high voltage is applied from the VBAT (B) terminal, it will not affect the camera system 1.

[0103] In this embodiment, a PGND (B) terminal, serving as a ground potential, is positioned next to the VBAT (B) terminal, specifically at the third position from the foremost point in the mounting direction. The PGND (L) terminal is positioned next to the VBAT (L) terminal, also at the third position from the foremost point 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 rotating the lens 3 in the disassembly direction for replacement, the VBAT (L) terminal initially contacts the PGND (B) terminal. The charge accumulated in the capacitor C1 is rapidly discharged from the PGND (B) terminal, which serves as a ground potential, without affecting other circuits of the camera system 1.

[0104] In this embodiment, a V33(B) terminal is positioned next to the PGND(B) terminal, at the fourth position from the foremost point in the mounting direction, and a GND(B) terminal is positioned next to it, at the fifth position from the foremost point. Similarly, a V33(L) terminal is positioned next to the PGND(L) terminal, at the fourth position from the foremost point in the mounting direction, and a GND(L) terminal is positioned next to it, at the fifth position from the foremost point. The voltage supplied from the V33(B) terminal is stored in the capacitor C2 connected to the V33(L) terminal. When rotating the lens 3 in the disassembly direction for replacement, the V33(L) terminal initially contacts the GND(B) terminal. The charge stored in the capacitor C2 is quickly discharged from the GND(B) terminal, which is at ground potential, without affecting other circuits of the camera system 1.

[0105] Next to the GND (B) terminal, at the sixth position from the front, is the RDY (B) terminal; next to it, at the seventh position from the front, is the DATAB (B) terminal; next to it, at the eighth position from the front, is the CLK (B) terminal; next to it, at the ninth position from the front, is the DATAL (B) terminal; next to it, at the tenth position from the front, is the HCLK (B) terminal; and next to it, at the very end, is the HDATA (B) terminal.

[0106] Next to the GND (L) terminal, at the sixth position from the front, is the RDY (L) terminal; next to it, at the seventh position from the front, is the DATAB (L) terminal; next to it, at the eighth position from the front, is the CLK (L) terminal; next to it, at the ninth position from the front, is the DATAL (L) terminal; and next to it, at the tenth position from the front, is the HCLK (L) terminal. At the very end next to it is the HDATA (L) terminal.

[0107] Next, the impact of noise from the communication lines formed by the terminals on the camera body and the terminals on the lens side will be described. Hot-wire communication is a one-way transmission of information (lens data) relative to the camera body after communication begins, and it is performed at a high frequency (repeated with extremely short cycles). During hot-wire communication, a clock signal (H clock signal) is transmitted from the HCLK(L) terminal to the HCLK(B) terminal. Since the clock signal is a signal that repeats between high and low levels with a short cycle, it becomes a relatively large noise source compared to other signals. Moreover, since the clock signal transmitted from the HCLK(L) terminal to the HCLK(B) terminal is a signal output from the interchangeable lens 3, even if noise is incorrectly added to this clock signal, the camera body 2 cannot detect this noise. Thus, the possibility that the clock signal (H clock signal) flowing in the HCLK terminal becomes a noise source and / or the possibility that noise is added to the clock signal (H clock signal) may cause malfunctions in the camera system 1. Examples of malfunctions include false detections during lens replacement and incorrect command communication.

[0108] In this embodiment, the HCLK terminal is positioned away from the VBAT terminal, which is subjected to a high voltage. Since the voltage and current of the VBAT terminal of the drive unit 37 driving the interchangeable lens 3 varies depending on the drive state of the drive unit 37, these variations in voltage and current at the VBAT terminal can potentially cause noise for other terminals. Therefore, by separating the VBAT terminal from the HCLK terminal, the influence of noise generated by variations in the voltage and current of the VBAT terminal on the clock signal (H clock signal) can be suppressed. This effectively suppresses noise from being added to the clock signal (H clock signal).

[0109] The RDY terminal is used to indicate whether command communication is possible. The HCLK terminal, which can be a noise source, is positioned away from the RDY terminal. Therefore, it is possible to suppress the influence of noise generated by the clock signal (H clock signal) on the signal of the RDY terminal.

[0110] In addition, HDATA and DATAL terminals are arranged on both sides of the HCLK terminal. This helps suppress the influence of noise from the HCLK terminal on terminals other than the HDATA and DATAL terminals. The signal fluctuations flowing through the HDATA and DATAL terminals are less than those of the clock signal (H clock signal). Therefore, this is to suppress the effects of clock signal (H clock signal) fluctuations on terminals other than the HDATA and DATAL terminals.

[0111] Next, as described above, command data communication is a bidirectional communication between the camera body and the interchangeable lens. During command data communication, a clock signal (C clock signal) is transmitted from the CLK(B) terminal to the CLK(L) terminal. For the same reasons as mentioned above, the clock signal transmitted from the CLK terminal can also become a noise source. Furthermore, when noise is added to the clock signal (C clock signal), anomalies will occur in command communication. Therefore, in this embodiment, the CLK terminal is positioned away from the VBAT terminal where a high voltage is applied. Since the voltage and current of the VBAT terminal of the drive unit 37 that drives the interchangeable lens 3 varies depending on the drive state of the drive unit 37, the variation in voltage and current of the VBAT terminal may become noise for other terminals. Therefore, by separating the VBAT terminal from the CLK terminal, it is possible to suppress the influence of noise from the VBAT terminal on the clock signal (C clock signal). That is, it is possible to suppress noise added to the clock signal (C clock signal).

[0112] Additionally, the CLK terminal is configured away from the RDY terminal, which is used to indicate whether command communication is possible.

[0113] Furthermore, when the HCLK terminal and the CLK terminal are adjacent, the clock signal of one can affect the clock signals of the other, becoming a noise source. In this embodiment, a DATAL terminal is arranged between the CLK terminal and the HCLK terminal. Additionally, a DATAB terminal is arranged between the CLK terminal and the RDY terminal. That is, DATAL and DATAB terminals are arranged on both sides of the CLK terminal. This suppresses the impact of noise caused by the CLK terminal on the camera system. Since the signal fluctuations flowing through the DATAL and DATAB terminals are less than those of the clock signal (C clock signal), this is to suppress the effects of clock signal (C clock signal) fluctuations on terminals other than the DATAL and DATAB terminals.

[0114] When the DATAL terminal is configured between the CLK terminal and the HCLK terminal, since the signal variation flowing through the DATAL terminal is less than that of the clock signal (C clock signal) of the CLK terminal and the clock signal (H clock signal) of the HCLK terminal, this is to suppress the influence of the variation of the clock signal (C clock signal) of the CLK terminal on the clock signal (H clock signal) and to suppress the influence of the variation of the clock signal (H clock signal) of the HCLK terminal on the clock signal (C clock signal) of the CLK terminal.

[0115] Furthermore, as described above, the signal level of the RDY terminal needs to be determined for command data communication. Since the signal level of the RDY terminal indicates whether command data communication is possible, noise significantly impacts shooting operations. Consider the following scenario: although command data communication is impossible, the camera-side control unit 23 mistakenly identifies it as capable due to noise. In this case, although the lens-side control unit 33 cannot receive command data, the camera-side control unit 23 sends command data and mistakenly identifies it as performing control according to the command data during lens replacement. However, since the lens-side control unit 33 cannot receive command data, it will not perform control according to the mistakenly sent command data. Therefore, the operation of the camera system 1 will malfunction. Therefore, it is necessary to prevent noise from being added to the signal of the RDY terminal. To prevent noise from being added to the signal of the RDY terminal, it is preferable to provide terminals on both sides of the RDY terminal for the flow of a relatively stable signal, i.e., a signal with minimal change in signal level per unit time. In this embodiment, a GND terminal and a DATAB terminal are provided on both sides of the RDY terminal. Since the GND terminal is at ground potential, it is stable. The DATAB terminal also provides a more stable signal flow compared to the CLK and HCLK terminals. Therefore, it can suppress the noise affecting the signal at the RDY terminal.

[0116] Next, the power supplied from the VBAT(B) terminal to the VBAT(L) terminal (power supply voltage of the drive system) is used to drive the actuator (e.g., a stepper motor) of the drive unit 37 for changing lens 3. Therefore, the current flowing through the VBAT terminal varies considerably when the actuator is driven and not driven. This current variation becomes a noise source relative to the signals flowing through other terminals. In this embodiment, the VBAT terminal is positioned away from the RDY, DATAB, CLK, and DATAL terminals used for command data communication, and the HCLK and HDATA terminals used for hot-wire communication. Furthermore, the GND, V33, and PGND terminals are arranged between the VBAT terminal and these communication terminals. In particular, since the GND and PGND terminals are grounded, the influence of noise can be suppressed. Thus, the impact of noise caused by the variation of current flowing through the VBAT terminal on data communication can be suppressed.

[0117] Here, we summarize the terminal configurations that take noise into account, as described above.

[0118] The RDY terminal is configured to be separate from either the VBAT terminal or the HCLK terminal, which are potential sources of noise. This suppresses the impact of noise on the RDY terminal, which is used to indicate whether command communication is possible.

[0119] The HCLK terminal, which will become a noise source, is sandwiched between the HDATA terminal and the DATAL terminal, and the CLK terminal is sandwiched between the DATAL terminal and the DATAB terminal. That is, the HDATA terminal, HCLK terminal, DATAL terminal, CLK terminal, and DATAB terminal are arranged sequentially from the rear end in the mounting direction. This can suppress the influence of noise caused by the clock signal on the RDY terminal, etc.

[0120] Furthermore, considering the impact of noise, the power supply terminal group and the communication terminal group are positioned away from ground by clamping the RDY terminal. In detail, with the RDY terminal clamped, on the front side in the mounting direction, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal (serving as power supply terminals) are arranged sequentially from the front side; on the rear side in the mounting direction, the DATAB terminal, CLK terminal, DATAL terminal, HCLK terminal, and HDATA terminal (serving as communication terminals) are arranged sequentially from the front side. This suppresses the influence of the power supply system terminal group, such as the VBAT terminal, on the communication terminals. Additionally, it suppresses the impact of noise on the power supply system terminal group, such as the VBAT terminal, and the RDY terminal of the communication terminal group, such as the HCLK and CLK terminals.

[0121] Of the HCLK terminal, which transmits the clock signal (H clock signal) for hot-wire communication, and the CLK terminal, which transmits the clock signal (C clock signal) for command data communication, the HCLK terminal is positioned further away from the VBAT terminal compared to the CLK terminal. This is because, although the body-side control unit 23 outputs the clock signal (C clock signal) transmitted from the CLK terminal to the interchangeable lens via the body-side communication unit 24, the body-side control unit 23 may misinterpret the clock signal (H clock signal) transmitted from the interchangeable lens via the lens-side communication unit 34 and through the HCLK (L) terminal to the camera body when noise is added to it. Therefore, the noise added to the HCLK terminal has a greater impact on the camera system 1.

[0122] Between the HCLK and GND terminals, the HCLK terminal is positioned further away from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is positioned between the GND and VBAT terminals. This allows for the shielding of the HCLK terminal from noise caused by the VBAT terminal that is transmitted to the clock signal (H clock signal) used for hot-wire communication.

[0123] Between the CLK and GND terminals, the CLK terminal is positioned further away from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is positioned between the GND and VBAT terminals. This shields the CLK terminal from noise caused by the VBAT terminal that is transmitted to the clock signal (C clock signal) used for command data communication.

[0124] (Considering the terminal configuration for wear)

[0125] From this point onward, the contact of each terminal when attaching or removing the lens 3 relative to the camera body 2 will be described.

[0126] When the interchangeable lens 3 is mounted on the camera body 2, the body-side terminals successively contact the lens-side terminals. The same occurs 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 part 22, rub against each other one after another, acting as exposed conductive contact surfaces of the lens-side terminals. Since multiple interchangeable lenses are mounted and removed from a single camera body, the body-side terminals are more prone to wear than the lens-side terminals. In particular, the body-side terminals located further back in the mounting direction of the interchangeable lens 3 are rubbed against by more lens-side terminals, resulting in more friction. Therefore, compared to the front-side body-side terminals, the more rear-side body-side terminals are, the more easily wear develops on the tip of their pins. Since wear on the body-side terminals affects contact with the lens-side terminals, it may cause unstable data communication.

[0127] In this embodiment, since the LDET(B) terminal is positioned at the foremost point in the mounting direction, wear on the LDET(B) terminal is minimized. Consequently, the LDET(B) terminal and the LDET(L) terminal make good contact, reducing the likelihood of erroneous detection during lens 3 replacement.

[0128] As described above, in this embodiment, to suppress the impact of noise on communication, the CLK(B) terminal and HCLK(B) terminal are positioned away from the VBAT(B) terminal. That is, the VBAT(B) terminal is positioned at the second position from the front end in the mounting direction, and the CLK(B) terminal and HCLK(B) terminal are positioned at the rear end, away from the VBAT(B) terminal. Therefore, compared to the LDET(B) terminal and VBAT(B) terminal, the CLK(B) terminal and HCLK(B) terminal experience more wear. In this embodiment, the CLK(B) terminal and HCLK(B) terminal are positioned near the first claw portion 29a on the fuselage side. That is, the CLK(B) terminal and HCLK(B) terminal are positioned closer to the inner peripheral edge of the inner peripheral edge of the first claw portion 29a on the fuselage side, compared to the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side is shorter than the distance between the VBAT(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side. Furthermore, the distance between the HCLK(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side is shorter than the distance between the VBAT(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side. As described above, a first leaf spring 41a is located on the inner side of the first claw portion 29a on the fuselage side. The first leaf spring 41a is used to move in the +Z direction (… Figure 1 Press the first claw 39a on the lens side. 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. Furthermore, the LDET (B) terminal is also similar to the VBAT (B) terminal; 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. Therefore, the CLK (B) terminal and the HCLK (B) terminal are pressed more forcefully towards the lens side terminal compared to the VBAT (B) terminal and the LDET (B) terminal.

[0129] On the lens side, the CLK(L) and HCLK(L) terminals are positioned closer to the inner periphery of the first claw portion 39a on the lens side compared to the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side. Therefore, when the CLK(L) terminal and HCLK(L) terminal located next to the first claw portion 39a on the lens side are fully attached, they are pressed against their respective body-side terminals by the first leaf spring 41a. Furthermore, similar to the VBAT(L) terminal, in the fully mounted state, the distances between the CLK(L) terminal and the first leaf spring 41a, and between the HCLK(L) terminal and the first leaf spring 41a, are both shorter than the distance between the LDET(L) terminal and the first leaf spring 41a. Therefore, in the fully mounted state, the force applied to the CLK(L) and HCLK(L) terminals towards the camera body is stronger than that applied to the LDET(L) terminal. Thus, even if the CLK(B) and HCLK(B) terminals wear down, good contact can be maintained, ensuring stable clock signals and enabling stable data communication. Additionally, for example, even if an impact is applied to the camera body 2 and / or the lens 3 while maintaining the fully mounted state, contact between the CLK(B) and CLK(L) terminals, and contact between the HCLK(B) and HCLK(L) terminals, can be maintained.

[0130] Even when a notch is formed in a portion of the lens-side first claw portion 39a, the entire portion consisting of the protrusion located in the area opposite to the body-side first claw portion 29a and the portion after the notch is formed can be considered as the lens-side first claw portion. As a method of forming the notch, the lens-side claw portion can be divided into two or more notches in the circumferential direction, a portion of the lens-side claw portion can be notched, or at least a portion of the lens-side claw portion can be notched with a shortened radial length. Furthermore, the circumferential length of the lens-side claw portion can be varied within the range of the corresponding body-side insertion / removal portion. The same applies to the lens-side second claw portion 39b, lens-side third claw portion 39c, and lens-side fourth claw portion 39d. Additionally, the radial thickness of the cylindrical portion can be appropriately varied, and it can also be a shape that at least a portion protrudes inward compared to the cylindrical portion of this embodiment.

[0131] As described above, the CLK(B) and HCLK(B) terminals experience more wear compared to the LDET(B) and VBAT(B) terminals. In this embodiment, the CLK(B) and HCLK(B) terminals are positioned near the first claw portion 29a on the fuselage side. That is, the CLK(B) and HCLK(B) terminals are positioned closer to the inner periphery of the first claw portion 29a on the fuselage side compared to the LDET(B) and VBAT(B) terminals. In other words, the distance between the CLK(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side is shorter than the distance between the LDET(B) and VBAT(B) terminals and the inner periphery of the first claw portion 29a on the fuselage side, and the distance between the HCLK(B) terminal and the inner periphery of the first claw portion 29a on the fuselage side is shorter than the distance between the LDET(B) and VBAT(B) terminals and the inner periphery of the first claw portion 29a on the fuselage side. As described above, there is a first leaf spring 41a on the inner side of the first claw portion 29a on the fuselage side, which is used to move in the +Z direction ( Figure 1 Press the first claw 39a on the lens side. 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 and the VBAT (B) terminal and the first leaf spring 41a.

[0132] On the lens side, the CLK(L) and HCLK(L) terminals are positioned closer to the inner periphery of the first claw portion 39a on the lens side compared to the LDET(L) and VBAT(L) terminals. In other words, the distance between the CLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the LDET(L) and VBAT(L) terminals and the inner periphery of the first claw portion 39a on the lens side. Furthermore, the distance between the HCLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the LDET(L) and VBAT(L) terminals and the inner periphery of the first claw portion 39a on the lens side. Therefore, the CLK(L) and HCLK(L) terminals located next to the first claw portion 39a on the lens side are pressed against their respective body-side terminals by the first leaf spring 41a. Therefore, the CLK(B) and HCLK(B) terminals are pressed forcefully against the lens-side terminals compared to the LDET(B) and VBAT(B) terminals. This ensures good contact and stable communication even if the CLK(B) and HCLK(B) terminals wear down. Furthermore, even if an impact is applied to the camera body 2 and / or the lens 3 is changed while maintaining the fully mounted state, contact between the CLK(B) and HCLK(B) terminals and the lens-side terminals can be maintained.

[0133] In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are also located near the fourth claw portion 29d on the fuselage side. That is, the CLK(B) terminal and the HCLK(B) terminal are positioned closer to the fourth claw portion 29d on the fuselage side than the VBAT(B) terminal and the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the fourth claw portion 29d on the fuselage side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw portion 29d on the fuselage side, and the distance between the HCLK(B) terminal and the fourth claw portion 29d on the fuselage side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw portion 29d on the fuselage side. As described above, a fourth leaf spring 41d is located inside the fourth claw portion 29d on the fuselage side, and the fourth leaf spring 41d is used to move in the +Z direction ( Figure 1 Press the fourth claw portion 39d on the lens side. Therefore, the CLK (B) terminal and HCLK (B) terminal located near the fourth claw portion 39d on the lens side are stably and forcefully pressed against the lens side terminal by the first leaf spring 41a and the fourth leaf spring 41d, compared to the VBAT (B) terminal and the LDET (B) terminal.

[0134] The distance between the aforementioned CLK(B) terminal and the first claw portion 29a on the fuselage side (the same applies to the fourth claw portion 29d on the fuselage side, but omitted below) is the straight-line distance between one end of the first claw portion 29a on the fuselage side and the CLK(B) terminal, or it can be defined as the straight-line distance between the other end of the first claw portion 29a on the fuselage side and the CLK(B) terminal. Alternatively, the aforementioned distance between the CLK(B) terminal and the first claw portion 29a on the fuselage side can also be defined as the straight-line distance between the middle position of the first claw portion 29a on the fuselage side in the circumferential direction of the fuselage side assembly 21 and the CLK(B) terminal. The distances between other fuselage side terminals such as the HCLK(B) terminal, VBAT(B) terminal, and LDET(B) terminal and the first claw portion 29a on the fuselage side are also straight-line distances. The distances between the first leaf spring 41a (fourth leaf spring 41d) and the fuselage side terminals are also straight-line distances.

[0135] Furthermore, the distance between the aforementioned CLK(B) terminal and the first claw portion 29a on the fuselage side (the same applies to the fourth claw portion 29d on the fuselage side, but omitted below) can be defined as either the arc-shaped distance between one end of the first claw portion 29a on the fuselage side and the CLK(B) terminal in the circumferential direction of the fuselage side fitting 21, or the arc-shaped distance between the other end of the first claw portion 29a on the fuselage side and the CLK(B) terminal. Alternatively, the distance between the aforementioned CLK(B) terminal and the first claw portion 29a on the fuselage side can also be defined as the arc-shaped distance between the middle position of the first claw portion 29a on the fuselage side and the CLK(B) terminal in the circumferential direction of the fuselage side fitting 21. The distance between other fuselage side terminals such as the HCLK(B) terminal, VBAT(B) terminal, and LDET(B) terminal and the first claw portion 29a on the fuselage side is also an arc-shaped distance. The distance between the first leaf spring 41a (fourth leaf spring 41d) and the side terminal of the fuselage is also an arc-shaped distance.

[0136] The camera body 2 has been described above, but the same applies to the lens replacement 3. In this embodiment, the CLK (L) terminal and the HCLK (L) terminal are positioned near the lens-side first claw 39a. That is, the CLK (L) terminal and the HCLK (L) terminal are positioned closer to the lens-side first claw 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 39a is shorter than the distance between the VBAT (L) terminal or the LDET (L) terminal and the lens-side first claw 39a, and the distance between the HCLK (L) terminal and the lens-side first claw 39a is shorter than the distance between the VBAT (L) terminal or the LDET (L) terminal and the lens-side first claw 39a. The lens-side first claw 39a is moved in the +Z direction by the first leaf spring 41a on the camera body side ( Figure 1 Press. Therefore, similarly as above, the CLK (L) terminal and HCLK (L) terminal located near the first claw portion 39a on the lens side are pressed forcefully against the body side terminal by the first leaf spring 41a, compared to the VBAT (L) terminal or LDET (L) terminal.

[0137] In this embodiment, such as Figure 5As shown in (a), the CLK(B) terminal and the HCLK(B) terminal are positioned inside a fan-shaped area (within a range of 50 degrees) formed by the center of the opening of the mounting part 21 (i.e., the position of the optical axis O of the lens replacement 3) and the arc-shaped first claw portion 29a on the body side. Alternatively, the CLK(B) terminal and the HCLK(B) terminal are positioned inside a triangular area formed by the center of the opening of the mounting part 21 (i.e., the position of the optical axis O of the lens replacement 3) and the two ends of the inner periphery of the first claw portion 29a on the body side. Therefore, although there is no body-side first claw 29a on the extension line of the single-dot line 51 connecting the center of the opening of the fitting 21 to the LDET(B) terminal, there is a body-side first claw 29a on the extension line of the single-dot line 52 connecting the center of the opening of the fitting 21 to the HCLK(B) terminal, and there is also a body-side first claw 29a on the extension line of the single-dot line 53 connecting the center of the opening of the fitting 21 to the CLK(B) terminal. Thus, in the assembled state, the CLK(B) terminal and the HCLK(B) terminal are pressed forcefully against the corresponding lens-side terminal compared to the LDET(B) terminal.

[0138] like Figure 6 As shown, the CLK(L) terminal and the HCLK(L) terminal are arranged inside a fan-shaped area (within an angle of 60 degrees) formed by the center of the opening of the fitting 31 (i.e., the position of the optical axis O of the replacement lens 3) and the arc-shaped lens-side first claw portion 39a. Alternatively, the CLK(L) terminal and the HCLK(L) terminal are arranged inside a triangular area formed by the center of the opening of the fitting 31 (i.e., the position of the optical axis O of the replacement lens 3) and the two ends of the outer periphery of the lens-side first claw portion 39a. Therefore, although the lens-side first claw portion 39a is not present on the extension line of the single-dot dashed line 61 connecting the center of the opening of the fitting 31 to the LDET(L) terminal, it is present on the extension line of the single-dot dashed line 62 connecting the center of the opening of the fitting 31 to the HCLK(L) terminal, and on the extension line of the single-dot dashed line 63 connecting the center of the opening of the fitting 31 to the CLK(L) terminal. Therefore, in the fully assembled state, the CLK(L) and HCLK(L) terminals make stable contact with their corresponding body-side terminals compared to the LDET(L) terminal. In other words, a stronger force is applied to the body-side terminals of the CLK(L) and HCLK(L) terminals compared to the LDET(L) terminal. Thus, even with wear on the tips of the CLK(B) and HCLK(B) terminals, stable communication of the clock signal between the camera body 2 and the interchangeable lens 3 is possible.

[0139] Furthermore, while the CLK(B), CLK(L), HCLK(B), and HCLK(L) terminals have been described in this embodiment, the same applies to other terminals used as communication system terminals such as HDATA(B), HDATA(L), DATAL(B), DATAL(L), DATAB(B), and DATAB(L). That is, the HDATA(B), DATAL(B), and DATAB(B) terminals are positioned closer (shorter distance) to the first claw 29a and the first leaf spring 41a on the body side compared to the LDET(B) and VBAT(B) terminals. Therefore, the HDATA(B), DATAL(B), and DATAB(B) terminals are pressed firmly against the lens-side terminals compared to the VBAT(B) and LDET(B) terminals, maintaining good contact with the lens-side terminals. Furthermore, the HDATA(L), DATAL(L), and DATAB(L) terminals are positioned closer (shorter) to the lens-side first claw 39a compared to the LDET(L) and VBAT(L) terminals. Therefore, the HDATA(L), DATAL(L), and DATAB(L) terminals are pressed firmly against the camera body-side terminals compared to the VBAT(L) and LDET(L) terminals, maintaining good contact with them.

[0140] (Second Implementation)

[0141] Next, the interchangeable lens 3 of the camera system 1 according to the second embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 7 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the second embodiment. (Example) Figure 7 As shown, in the replacement lens 3 according to the second embodiment, similar to the replacement lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the replacement lens 3 according to the second embodiment does not have the GND (L) terminal of the replacement lens 3 according to the first embodiment.

[0142] Therefore, in the interchangeable lens 3 according to the second embodiment, the PGND(L) terminal is used as the ground potential (grounding part) of the power supply voltage of the drive system, and is connected to various parts such as the lens-side control unit 33, and is used as the ground potential (grounding part) of the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the V33(L) terminal and the PGND(L) terminal.

[0143] The connection and configuration of the terminals other than the PGND(L) terminal of the replacement lens 3 in the second embodiment are the same as those in the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals LDET (L), VBAT (L), PGND (L), V33 (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0144] (Third Implementation)

[0145] Next, the interchangeable lens 3 of the camera system 1 according to the third embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 8 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the third embodiment. Figure 8 As shown, in the replacement lens 3 according to the third embodiment, similar to the replacement lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a V33 (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the replacement lens 3 according to the third embodiment does not have the PGND (L) terminal of the replacement lens 3 according to the first embodiment.

[0146] Therefore, in the interchangeable lens 3 according to the third embodiment, the GND (L) terminal is used as the ground potential (grounding part) of the power supply voltage of the circuit system, and is also used as the ground potential (grounding part) of the power supply voltage of the drive system in each part connected to the drive unit 37, etc. A bypass capacitor C1 is connected between the VBAT (L) terminal and the GND (L) terminal, and a bypass capacitor C2 is connected between the V33 (L) terminal and the GND (L) terminal.

[0147] The connection and configuration of the terminals other than the GND (L) terminal of the replacement lens 3 in the third embodiment are the same as those in the first embodiment. Figure 6Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals for LDET (L), VBAT (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0148] (Fourth Implementation)

[0149] Next, the interchangeable lens 3 of the camera system 1 according to the fourth embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 9 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the fourth embodiment. Figure 9 As shown, in the interchangeable lens 3 according to the fourth embodiment, similar to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the fourth embodiment does not have the V33 (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power supplied to the lens-side control part 33, etc., is not supplied from the camera body 2.

[0150] Therefore, the interchangeable lens 3 according to the fourth embodiment includes a DC / DC converter 50. The DC / DC converter 50 is, for example, a step-down voltage conversion circuit, connected to the VBAT(L) terminal and the lens-side control unit 33. The DC / DC converter 50 converts the power supply voltage supplied from the camera body 2 via the VBAT(L) terminal to supply power to the lens-side control unit 33 and the like. A bypass capacitor C2 is connected between the wiring supplying power from the DC / DC converter 50 to the lens-side control unit 33 and the like, and the GND(L) terminal.

[0151] The connection and configuration of the terminals other than the VBAT(L) terminal of the interchangeable lens 3 in the fourth embodiment are the same as those in the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals for LDET (L), VBAT (L), PGND (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0152] (Fifth Implementation)

[0153] Next, the interchangeable lens 3 of the camera system 1 according to the fifth embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 10 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the fifth embodiment. (Example) Figure 10 As shown, in the interchangeable lens 3 according to the fifth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the fifth embodiment does not have the VBAT (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power for the drive system supplied to the drive unit 37 and the like is not supplied from the camera body 2.

[0154] Therefore, the interchangeable lens 3 according to the fifth embodiment includes a DC / DC converter 51. The DC / DC converter 51 is, for example, a boost-type voltage conversion circuit, connected to the V33(L) terminal and the drive unit 37. The DC / DC converter 51 converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the circuitry of the drive system such as the drive unit 37. A bypass capacitor C1 is connected between the wiring supplying power from the DC / DC converter 51 to the drive unit 37 and the PGND(L) terminal.

[0155] The connection and configuration of the terminals other than the V33(L) terminal of the replaceable lens 3 according to the fifth embodiment are the same as those according to the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals for LDET (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0156] (Sixth Implementation Method)

[0157] Next, the interchangeable lens 3 of the camera system 1 according to the sixth embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 11 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the sixth embodiment. (Example) Figure 11As shown, in the interchangeable lens 3 according to the sixth embodiment, similar to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the sixth embodiment does not have the V33 (L) terminal and the GND (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power supplied to the lens-side control part 33, etc., is not supplied from the camera body 2.

[0158] Therefore, the interchangeable lens 3 according to the sixth embodiment includes a DC / DC converter 52. The DC / DC converter 52 is, for example, a step-down voltage conversion circuit, connected to the VBAT(L) terminal and the lens-side control unit 33. The DC / DC converter 52 converts the power supply voltage supplied from the camera body 2 via the VBAT(L) terminal and supplies power to the lens-side control unit 33 and the like.

[0159] Furthermore, in the interchangeable lens 3 according to the sixth embodiment, the PGND(L) terminal is used as the ground potential (grounding part) of the power supply voltage of the drive system, and is connected to various parts such as the lens-side control unit 33, and is used as the ground potential (grounding part) of the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the wiring that supplies power from the DC / DC converter 52 to the lens-side control unit 33 and the PGND(L) terminal.

[0160] The connection and configuration of the terminals other than the VBAT(L) terminal and PGND(L) terminal of the interchangeable lens 3 according to the sixth embodiment are the same as those according to the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals LDET (L), VBAT (L), PGND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0161] (Seventh Implementation)

[0162] Next, the interchangeable lens 3 of the camera system 1 according to the seventh embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 12 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the seventh embodiment. Figure 12As shown, in the interchangeable lens 3 according to the seventh embodiment, similar to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a VBAT (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the seventh embodiment does not have the PGND (L) terminal and V33 (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power supplied to the lens-side control part 33, etc., is not supplied from the camera body 2.

[0163] Therefore, the interchangeable lens 3 according to the seventh embodiment includes a DC / DC converter 53. The DC / DC converter 53 is, for example, a step-down voltage conversion circuit, connected to the VBAT(L) terminal and the lens-side control unit 33. The DC / DC converter 53 converts the power supply voltage supplied from the camera body 2 via the VBAT(L) terminal and supplies power to the lens-side control unit 33 and the like.

[0164] Furthermore, in the interchangeable lens 3 according to the seventh embodiment, the GND (L) terminal is used as the ground potential (grounding part) of the power supply voltage of the circuit system, and is connected to various parts such as the drive unit 37, and is also used as the ground potential (grounding part) of the power supply voltage of the drive system. A bypass capacitor C1 is connected between the VBAT (L) terminal and the GND (L) terminal, and a bypass capacitor C2 is connected between the wiring supplying power from the DC / DC converter 53 to the lens-side control unit 33 and the GND (L) terminal.

[0165] The connections and configurations of the terminals other than the VBAT(L) and GND(L) terminals of the interchangeable lens 3 in the seventh embodiment are the same as those in the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals for LDET (L), VBAT (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0166] (Eighth Implementation)

[0167] Next, the interchangeable lens 3 of the camera system 1 according to the eighth embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 13 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the eighth embodiment. Figure 13As shown, in the interchangeable lens 3 according to the eighth embodiment, similar to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a PGND (L) terminal, a V33 (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the eighth embodiment does not have the VBAT (L) terminal and GND (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power for the drive system supplied to the drive unit 37 and the like is not supplied from the camera body 2.

[0168] Therefore, the interchangeable lens 3 according to the eighth embodiment includes a DC / DC converter 54. The DC / DC converter 54 is, for example, a boost-type voltage conversion circuit, connected to the V33(L) terminal and the drive unit 37. The DC / DC converter 54 converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the circuitry of the drive system such as the drive unit 37.

[0169] Furthermore, in the interchangeable lens 3 according to the eighth embodiment, the PGND(L) terminal is used as the ground potential (grounding part) of the power supply voltage of the drive system, and is connected to various parts such as the lens-side control unit 33, and is used as the ground potential (grounding part) of the power supply voltage of the circuit system. A bypass capacitor C1 is connected between the wiring that supplies power from the DC / DC converter 54 to the drive unit 37 and the PGND(L) terminal.

[0170] The connection and configuration of all terminals except the PGND (L) terminal and V33 (L) terminal of the interchangeable lens 3 according to the eighth embodiment are the same as those according to the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals for LDET (L), PGND (L), V33 (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0171] (Ninth Implementation)

[0172] Next, the interchangeable lens 3 of the camera system 1 according to the ninth embodiment will be described. Descriptions of configurations common to the first embodiment described above will be omitted. Figure 14 This is a circuit diagram schematically illustrating the electrical connection between the camera body 2 and the interchangeable lens 3 according to the ninth embodiment. (Example) Figure 14As shown, in the interchangeable lens 3 according to the ninth embodiment, similar to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding part 32 has an LDET (L) terminal, a V33 (L) terminal, a GND (L) terminal, an RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. However, the interchangeable lens 3 according to the ninth embodiment does not have the VBAT (L) terminal and PGND (L) terminal of the interchangeable lens 3 according to the first embodiment, and the power for the drive system supplied to the drive unit 37 and the like is not supplied from the camera body 2.

[0173] Therefore, the interchangeable lens 3 according to the ninth embodiment includes a DC / DC converter 55. The DC / DC converter 55 is, for example, a boost-type voltage conversion circuit, connected to the V33(L) terminal and the drive unit 37. The DC / DC converter 55 converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the circuitry of the drive system, such as the drive unit 37.

[0174] Furthermore, in the interchangeable lens 3 according to the ninth embodiment, the GND (L) terminal is used as the ground potential (grounding part) of the power supply voltage of the circuit system, and is connected to various parts such as the drive unit 37, and is also used as the ground potential (grounding part) of the power supply voltage of the drive system. A bypass capacitor C1 is connected between the wiring that supplies power from the DC / DC converter 55 to the drive unit 37 and the GND (L) terminal.

[0175] The connection and configuration of the terminals other than the V33 (L) terminal and the GND (L) terminal of the replacement lens 3 according to the ninth embodiment are the same as those according to the first embodiment. Figure 6 Similarly, in the example shown, the lens-side terminal holding part 32 is provided with terminals LDET (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L).

[0176] In the second to ninth embodiments, similar to the first embodiment, the effect of suppressing various noises is as follows: The RDY terminal is arranged separately from either the VBAT terminal or the HCLK terminal, which are noise sources. Therefore, the influence of noise on the RDY terminal used to indicate whether command communication can be performed can be suppressed.

[0177] Furthermore, the HCLK terminal, which will become a noise source, is sandwiched between the HDATA terminal and the DATAL terminal, and the CLK terminal is sandwiched between the DATAL terminal and the DATAB terminal. That is, the HDATA terminal, HCLK terminal, DATAL terminal, CLK terminal, and DATAB terminal are arranged sequentially from the rear end in the mounting direction. As a result, the influence of noise caused by the clock signal on the RDY terminal, etc., can be suppressed.

[0178] Furthermore, considering the impact of noise, the power supply terminal group and the communication terminal group are positioned away from ground by clamping the RDY terminal. In detail, with the RDY terminal clamped, on the front side in the mounting direction, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal (serving as power supply terminals) are arranged sequentially from the front side; on the rear side in the mounting direction, the DATAB terminal, CLK terminal, DATAL terminal, HCLK terminal, and HDATA terminal (serving as communication terminals) are arranged sequentially from the front side. This suppresses the influence of the power supply system terminal group, such as the VBAT terminal, on the communication terminals. Additionally, it suppresses the impact of noise on the power supply system terminal group, such as the VBAT terminal, and the RDY terminal of the communication terminal group, such as the HCLK and CLK terminals.

[0179] Of the HCLK terminal, which transmits the clock signal (H clock signal) for hot-wire communication, and the CLK terminal, which transmits the clock signal (C clock signal) for command data communication, the HCLK terminal is positioned further away from the VBAT terminal compared to the CLK terminal. This is because, although the body-side control unit 23 outputs the clock signal (C clock signal) transmitted from the CLK terminal to the interchangeable lens via the body-side communication unit 24, the body-side control unit 23 may misinterpret the clock signal (H clock signal) transmitted from the interchangeable lens via the lens-side communication unit 34 and through the HCLK (L) terminal to the camera body when noise is added to it. Therefore, the noise added to the HCLK terminal has a greater impact on the camera system 1.

[0180] Between the HCLK and GND terminals, the HCLK terminal is positioned further away from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is positioned between the GND and VBAT terminals. This allows for the shielding of the HCLK terminal from noise caused by the VBAT terminal that is transmitted to the clock signal (H clock signal) used for hot-wire communication.

[0181] Between the CLK and GND terminals, the CLK terminal is positioned further away from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is positioned between the GND and VBAT terminals. This shields the CLK terminal from noise caused by the VBAT terminal that is transmitted to the clock signal (C clock signal) used for command data communication.

[0182] It can be a variation of the above embodiments, or one or more variations can be combined with the above embodiments.

[0183] (Variation Example 1)

[0184] Alternatively, either terminal used for command data communication or hotline communication can also function as a power-on signal transmitter from the interchangeable lens 3 to the camera body 2. For example, a power switch function can be provided on the interchangeable lens 3. Even when the interchangeable lens 3 is fully mounted 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, for example, via the lens-side communication unit 34 to the RDY(L) terminal. When the camera body-side control unit 23 detects the power-on signal via the camera body-side communication unit 24 and the RDY(B) terminal, it switches the camera system 1 from the power-off state to the power-on state, similar to when the power switch (not shown) on the camera body 2 is operated.

[0185] (Variation Example 2)

[0186] In this embodiment, the DATAB(B) terminal is arranged on the front end side of the CLK(B) terminal in the mounting direction, and the DATAL(B) terminal is arranged on the rear end side. However, the positions of the DATAB(B) terminal and the DATAL(B) terminal can also be interchanged. That is, they can also be arranged in the order of DATAL(B) terminal, CLK(B) terminal, and DATAB(B) terminal from the front end side in the mounting direction.

[0187] Furthermore, regarding each terminal of the lens-side terminal group described in the above embodiments, the LDET (L) terminal can also be referred to as the detection terminal. Additionally, the VBAT (L) terminal can also be referred to as the power supply terminal or the first power supply terminal. Additionally, the PGND (L) terminal can also be referred to as the ground terminal or the first ground terminal. Additionally, the V33 (L) terminal can also be referred to as the power supply terminal or the second power supply terminal. Additionally, the GND (L) terminal can also be referred to as the ground terminal or the second ground terminal. Additionally, the RDY (L) terminal can also be referred to as the ready terminal. Additionally, the DATAB (L) terminal can also be referred to as the data terminal or the first data terminal. Additionally, the CLK (L) terminal can also be referred to as the clock terminal or the first clock terminal. Additionally, the DATAL (L) terminal can also be referred to as the data terminal or the second data terminal. Additionally, the HCLK (L) terminal can also be referred to as the clock terminal or the second clock terminal. Additionally, the HDATA (L) terminal can also be referred to as the data terminal or the third data terminal.

[0188] Furthermore, in the above embodiment, a camera interchangeable lens was described as an example of an accessory, but the accessory is not limited to an interchangeable lens. For example, it could be a teleconverter, a wide-angle converter, a close-up ring, etc., which are attached between the camera body and the interchangeable lens and change the focal length of the interchangeable lens. Alternatively, it could be applied to the following accessory adapters: accessories that can attach interchangeable lenses of other accessory specifications to the aforementioned camera body accessory specifications. That is, any accessory used for attachment to a camera body accessory can be applied in the same way. In this case, the lens-side terminal group, lens-side claw 39, lens-side communication section 34, etc., correspond to the accessory-side terminal group, accessory-side protrusion, accessory-side communication section, etc. of each accessory. In the above embodiment, it is set as an accessory that can be attached and detached from the camera body, but the aforementioned camera body can be an accessory adapter that can attach an interchangeable lens of the aforementioned accessory specifications to a camera body with different accessory specifications, or it can be a configuration that can attach the aforementioned accessory to the accessory adapter.

Claims

1. An accessory that can be attached to and detached from a camera body and has multiple terminals. The accessory includes: The power terminal is supplied with a first power voltage from the camera body; The ready terminal is set to a high potential when communication with the camera body is not possible. The first clock terminal receives a first clock signal of the first cycle from the camera body; The first data terminal receives a first data signal from the camera body according to the first clock signal; The second data terminal outputs a second data signal to the camera body according to the first clock signal; The second clock terminal outputs a second clock signal of the second cycle to the camera body; as well as The third data terminal outputs a third data signal to the camera body according to the second clock signal. The distance between the second clock terminal and the power terminal is longer than the distance between the first clock terminal and the power terminal.

2. The accessory according to claim 1, The accessory has a detection terminal, which is used to enable the camera body to detect the attachment of the accessory.

3. The accessory according to claim 2, The accessory has a grounding terminal, which is used as a grounding potential.

4. The accessory according to claim 3, The accessory includes a voltage conversion circuit that converts the first power supply voltage into a second power supply voltage.

5. The accessory according to claim 3, The accessory has a second power terminal, which is supplied with a second power voltage.

6. The accessory according to claim 4 or 5, The accessory includes: The first circuit section is supplied with the first power supply voltage; and The second circuit section is supplied with the second power supply voltage. The grounding terminal is used as the grounding potential for the first circuit section and the second circuit section.

7. The accessory according to claim 6, The accessory includes a driven part, which includes an optical system. The first power supply voltage is higher than the second power supply voltage. The first circuit section drives the driven section.

8. The accessory according to claim 6 or 7, The accessory includes a driven part, which includes an optical system. The first power supply voltage is lower than the second power supply voltage. The second circuit section drives the driven section.

9. The accessory according to claim 7 or 8, The driven part includes: The component is any one of the following: a component that can move along the optical axis of the optical system; a component that can move in a manner that includes a component in a direction perpendicular to the optical axis; and a component that can move in a manner that changes the size of the opening through which the light beam passes.

10. The accessory according to claim 4 or 5, The second power supply voltage is used for: inputting a first data signal based on the first clock signal using the first data terminal, outputting a second data signal based on the first clock signal to the camera body using the second data terminal, and outputting a third data signal based on the second clock signal to the camera body using the third data terminal.

11. The accessory according to claim 1, The first power supply voltage is used to: input a first data signal based on the first clock signal using the first data terminal, output a second data signal based on the first clock signal to the camera body using the second data terminal, and output the third data signal based on the second clock signal to the camera body using the third data terminal.

12. The accessory according to claim 2, The detection terminal is in contact with the detection terminal on the fuselage side when fully installed. When the detection terminal comes into contact with the detection terminal on the fuselage side, the signal level of the detection terminal on the fuselage side will be low.

13. The accessory according to claim 1, The ready terminal output is a signal indicating whether the communication based on the first data signal and the second data signal can be performed.

14. The accessory according to claim 2, The detection terminal is located next to the power supply terminal. The third data terminal is located next to the second clock terminal.

15. The accessory according to claim 3, The grounding terminal is located next to the power supply terminal. The detection terminal is positioned next to the power supply terminal on the side opposite to the grounding terminal.

16. The accessory according to claim 1, The second data terminal is located next to the second clock terminal. The third data terminal is positioned next to the second clock terminal on the opposite side.

17. The accessory according to claim 1, The first data terminal is positioned next to the first clock terminal. The second data terminal is positioned next to the first clock terminal on the opposite side of the first data terminal.

18. The accessory according to claim 3, The grounding terminal is positioned next to the ready terminal. The first data terminal is positioned next to the ground terminal on the opposite side of the ready terminal.

19. The accessory according to claim 1, The first data signal is input synchronously with the first clock signal.

20. The accessory according to claim 1, The second data signal is output synchronously with the first clock signal.

21. The accessory according to claim 1, The third data signal is output synchronously with the second clock signal.

22. The accessory according to claim 1, When the device is in a state where it can communicate with the camera body, the potential of the ready terminal is low.

23. The accessory according to claim 3, The accessory has only one grounding terminal that is used as a grounding potential.

24. The accessory according to claim 1, The accessory has only one terminal that supplies power from the camera body.

25. The accessory according to claim 1, The frequency of the second clock signal is the same as or lower than that of the first clock signal.

26. The accessory according to any one of claims 1 to 25, The period of the output third data signal is shorter than the period of the input first data signal and the period of the output second data signal.

27. The accessory according to any one of claims 1 to 26, The accessory mentioned is a replacement lens.

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