Accessory

Abstract

To provide an accessory that can perform stable communication with a camera body.SOLUTION: An accessory can be attached to a camera body. The accessory comprises: a communication portion including a circuit for communicating with the camera body; a ready terminal used for indicating whether or not to be able to communicate with the camera body via the communication portion; a first data terminal to which a first data signal from the camera body to the communication portion is input; a second data terminal for outputting a second data signal from the communication portion to the camera body; a first clock terminal for outputting a clock signal from the communication portion to the camera body; and a third data terminal for outputting a third data signal from the communication portion to the camera body in synchronism with the clock signal. The ready terminal, the first data terminal, the second data terminal, the first clock terminal, and the third data terminal are arranged side by side in order.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an accessory.

Background Art

[0002] An accessory detachable from a camera body is known (for example, Patent Document 1). Conventionally, it has been necessary to attach an accessory to a camera body in a state where it can be properly used.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] An accessory according to a first aspect of the present invention is an accessory attachable to a camera body, including a communication unit including a circuit that communicates with the camera body, a ready terminal used to indicate whether communication with the camera body via the communication unit is possible, a first data terminal to which a first data signal from the camera body is input, a second data terminal that outputs a second data signal from the communication unit to the camera body, a first clock terminal that outputs a clock signal from the communication unit to the camera body, and a third data terminal that outputs a third data signal from the communication unit to the camera body in synchronization with the clock signal, wherein the ready terminal, the first data terminal, the second data terminal, the first clock terminal, and the third data terminal are arranged side by side in order.

Brief Description of the Drawings

[0005]

Figure 1

Figure 2

Figure 3

Figure 4

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Figure 15

Mode for Carrying Out the Invention

[0006] (First Embodiment) FIG. 1 is a diagram showing an outline of the configuration of a camera system 1 according to the first embodiment. The camera system 1 includes a camera body 2 and an interchangeable lens 3 as an example of an accessory detachable from the camera body 2.

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

[0008] The lens-side control unit 33 is composed of a microcomputer and its peripheral circuits, etc. The lens-side communication unit 34 performs data communication, which will be described later, with the camera body 2. The lens-side communication unit 34 is connected to a lens-side terminal group (described later) provided in the lens-side terminal holding portion 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. A predetermined control program, etc., executed by the lens-side control unit 33 is stored in advance in the lens-side storage unit 35. The lens-side control unit 33 controls the interchangeable lens 3 by reading the control program from the lens-side storage unit 35 and executing the program.

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

[0010] The camera body 2 includes a body-side mount 21, a body-side terminal holding portion 22, a body-side control unit 23 having a body-side communication unit 24, a body-side storage unit 25, a power supply unit 26, an imaging element 27, and a switch 28 that detects the state of a lock pin, which will be described later.

[0011] The body-side control unit 23 is composed of a microcomputer and its peripheral circuits, etc. Note that the body-side control unit 23 performs various controls of the body, but in this case, only the part related to communication is described, and other functions are omitted. The body-side communication unit 24 performs data communication, which will be described later, with the interchangeable lens 3. The body-side communication unit 24 is connected to a body-side terminal (to be described later) provided in the body-side terminal holding unit 22. Note that some terminals of the body-side terminal holding unit 22 are connected to the body-side control unit 23 as will be described later. The body-side storage unit 25 is a non-volatile storage medium. The body-side storage unit 25 is connected to the body-side control unit 23. A predetermined control program and the like executed by the body-side control unit 23 are stored in advance in the body-side storage unit 25. The body-side control unit 23 reads the control program from the body-side storage unit 25 and executes the program to control the camera body 2.

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

[0013] Figure 2 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3. The body-side terminal holding unit 22 has an LDET(B) terminal, a VBAT(B) terminal, a PGND(B) terminal, a V33(B) terminal, a GND(B) terminal, a RDY(B) terminal, a DATAB(B) terminal, a CLK(B) terminal, a DATAL(B) terminal, a HCLK(B) terminal, and a HDATA(B) terminal. These 11 body-side terminals are collectively referred to as the body-side terminal group.

[0014] The LDET(B) terminal is a terminal used for detecting the attachment and detachment of the interchangeable lens 3. The LDET(B) terminal is connected to the body-side control unit 23 via the resistor R2. A power supply V33 supplied from the power supply unit 26 is connected between the resistor R2 and the body-side control unit 23 via the resistor R1, and the LDET(B) terminal is pulled up.

[0015] 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. In FIG. 2, the direction of the supplied power is indicated by an arrow. The VBAT(B) terminal is a terminal used for supplying power to the interchangeable lens 3. The driving unit 37 of the interchangeable lens 3 is driven by the power supplied via the VBAT(B) terminal. The operation of the driving unit 37 requires a voltage and current larger than those of the lens-side control unit 33, and the power supply voltage applied by the power supply unit 26 to the VBAT(B) terminal is about 10V at maximum. 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 from the VBAT(B) terminal to the interchangeable lens 3. The PGND(B) terminal is a ground terminal corresponding to the VBAT(B) terminal and is used as the ground potential (ground) of the drive system power supply voltage.

[0016] The V33(B) terminal is a terminal used for supplying power to the interchangeable lens 3. The power supplied from the power supply unit 26 via the V33(B) terminal operates the lens-side control unit 33 and the like. Each unit such as the lens-side control unit 33 operates with a smaller voltage and current than the driving unit 37. The voltage applied by the power supply unit 26 to the V33(B) terminal is about 3.3V at maximum. 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 from the V33(B) terminal to the interchangeable lens 3. The GND(B) terminal is a ground terminal corresponding to the V33(B) terminal and is used as the ground potential (ground) of the circuit system power supply voltage.

[0017] The RDY(B) terminal is connected to the body-side communication unit 24. The DATAB(B) terminal, CLK(B) terminal, DATAL(B) terminal, HCLK(B) terminal, and HDATA(B) terminal are terminals of the communication system connected to the body-side communication unit 24. The RDY(B) terminal, DATAB(B) terminal, CLK(B) terminal, and DATAL(B) terminal are used for the command data communication described later. Also, the HCLK(B) terminal and HDATA(B) terminal are connected to the body-side communication unit 24 and are used for the hotline communication described later. In FIG. 2, the flow of the signal is indicated by an arrow. The potential of the RDY(B) terminal indicates whether the interchangeable lens 3 can perform command data communication. The DATAB(B) terminal is a terminal to which a data signal is output toward the interchangeable lens 3. The CLK(B) terminal is a terminal from which a clock signal (C clock signal) is output from the camera body 2 toward the interchangeable lens 3.

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

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

[0020] 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, a RDY(L) terminal, a DATAB(L) terminal, a CLK(L) terminal, a DATAL(L) terminal, a HCLK(L) terminal, and a HDATA(L) terminal. These 11 lens-side terminals in total are collectively referred to as the lens-side terminal group. When the interchangeable lens 3 is attached to the camera body 2, as shown by the dashed line in Fig. 2, the body-side terminals and the lens-side terminals are electrically connected. Specifically, the LDET(L) terminal is connected to the LDET(B) terminal, the VBAT(L) terminal is connected to the VBAT(B) terminal, the PGND(L) terminal is connected to the PGND(B) terminal, the V33(L) terminal is connected to the V33(B) terminal, the GND(L) terminal is connected to the GND(B) terminal, the RDY(L) terminal is connected to the RDY(B) terminal, the DATAB(L) terminal is connected to the DATAB(B) terminal, the CLK(L) terminal is connected to the CLK(B) terminal, the DATAL(L) terminal is connected to the DATAL(B) terminal, the HCLK(L) terminal is connected to the HCLK(B) terminal, and the HDATA(L) terminal is connected to the HDATA(B) terminal. The signals input to or output from each lens-side terminal correspond to the contacting body-side terminals respectively.

[0021] The LDET(L) terminal is a terminal used to detect the attachment and detachment of the interchangeable lens 3. The LDET(L) terminal is connected to the ground (GND) via a resistor R3. When the interchangeable lens 3 is attached to the camera body 2, the LDET(L) terminal and the LDET(B) terminal are electrically connected, and the LDET(B) terminal is pulled down. Thereby, the camera body 2 can detect that the interchangeable lens 3 is attached.

[0022] The VBAT(L) terminal, PGND(L) terminal, V33(L) terminal, and GND(L) terminal are power supply terminals that are electrically connected to the VBAT(B) terminal, PGND(B) terminal, V33(B) terminal, and GND(B) terminal, respectively. In Fig. 2, the direction of the supplied power is indicated by an arrow. The driving unit 37 of the interchangeable lens 3 is driven by the power supplied via the VBAT(L) terminal. The PGND(L) terminal is a ground terminal corresponding to the VBAT(L) terminal and is used as the ground potential (ground) of the power supply voltage of the drive system. A so-called bypass capacitor C1 is connected between the VBAT(L) terminal and the PGND(L) terminal.

[0023] The V33(L) terminal is a terminal used for power supply to the interchangeable lens 3. The V33(L) terminal and the GND(L) terminal are connected to each part such as the lens-side control unit 33. The lens-side control unit 33 and the like are operated by the power supplied from the power supply unit 26 via the V33(B) terminal. The GND(L) terminal is a ground terminal corresponding to the V33(B) terminal and is used as the ground potential (ground) of the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the V33(L) terminal and the GND(L) terminal.

[0024] The RDY(L) terminal is connected to the body-side communication unit 24 via the RDY(B) terminal. The DATAB(L) terminal, CLK(L) terminal, DATAL(L) terminal, HCLK(L) terminal, and HDATA(L) terminal are communication terminals that are electrically connected to the DATAB(B) terminal, CLK(B) terminal, DATAL(B) terminal, HCLK(B) terminal, and HDATA(B) terminal, respectively. The RDY(L) terminal, DATAB(L) terminal, CLK(L) terminal, and DATAL(L) terminal are used for the command data communication described later. Also, the HCLK(L) terminal and the HDATA(L) terminal are used for the hotline communication described later.

[0025] The VBAT(L) terminal and the PGND(L) terminal are connected to the drive unit 37 via the lens-side control unit 33. The V33(L) terminal and the GND(L) terminal are connected to each unit such as the lens-side control unit 33. The RDY(L) terminal, the DATAB(L) terminal, the CLK(L) terminal, the DATAL(L) terminal, the HCLK(L) terminal, and the HDATA(L) terminal are each connected to the lens-side communication unit 34.

[0026] (Description of Command Data Communication) Transmitting a control command (command) and control content (control data) from the body-side control unit 23 to the lens-side control unit 33 of the interchangeable lens 3, and transmitting response content (response data) and other data from the lens-side control unit 33 to the body-side control unit 23 is called command data communication. Command data communication is full-duplex communication. Command data communication is performed by digital data communication using the RDY(B) terminal, the RDY(L) terminal, the DATAB(B) terminal, the DATAB(L) terminal, the CLK(B) terminal, the CLK(L) terminal, the DATAL(B) terminal, and the DATAL(L) terminal via the body-side communication unit 24 and the lens-side communication unit 34.

[0027] The body-side control unit 23 transmits various control commands and control contents to the interchangeable lens 3 via the body-side communication unit 24 and the lens-side communication unit 34 by command data communication, and receives response contents and other data from the interchangeable lens 3, thereby transmitting and receiving various information with the interchangeable lens 3. The control command referred to here is, for example, a transmission command for lens information. The various information received from the interchangeable lens 3 is, for example, the model information of the interchangeable lens 3, information indicating optical characteristics such as the focal length of the imaging optical system 36, and the like. The various information transmitted to the interchangeable lens 3 is, for example, control commands such as lens drive instructions, control contents such as the drive amount of the lens, and the model information of the camera body 2. The control commands also include a drive command for the focus lens 36b. The lens-side control unit 33 receives various control commands from the body-side control unit 23, acquires control contents from the body-side control unit 23, or transmits response contents (for example, information regarding the execution status of initialization processing such as during initialization or after initialization completion in response to an initialization control command from the camera body 2) to the body-side control unit 23 by command data communication.

[0028] Figure 3 is an example of a timing chart showing the timing of command data communication. The body-side control unit 23 first checks the signal level of the RDY(B) terminal at the start (T1) of the command data communication. The signal level of the RDY(B) terminal indicates whether the lens-side control unit 33 can perform command data communication. When the lens-side control unit 33 is in a state where it cannot perform command data communication, it sets the signal level (potential) of the RDY(L) terminal to a high level (H level). When the lens-side control unit 33 is in a state where it can perform command data communication, it sets the signal level (potential) of the RDY(L) terminal to a low level (L level) via the lens-side communication unit 34.

[0029] At the start of command data communication (T1), if the signal level of the RDY(B) terminal is at a low level (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 transmits the C clock signal 401 to the lens side control unit 33 via the CLK(B) terminal and the CLK(L) terminal. The frequency at which the high level and low level of the C clock signal 401 in FIG. 3 repeat is, for example, 8 MHz. The body side control unit 23 outputs a body side command signal 402, which is a control command, from the DATAB(B) terminal in synchronization with the C clock signal 401. That is, the body side control unit 23 transmits the body side command signal 402 to the lens side control unit 33 via the DATAB(B) terminal and the DATAB(L) terminal. The body side command signal 402 indicated by the switching between the high level and low level of DATAB in FIG. 3 is a signal representing the control that the body side control unit 23 instructs the lens side control unit 33 by command data communication. For example, the body side command signal 402 is a signal representing a request for the model information of the interchangeable lens 3 or a signal representing an instruction to drive the focus lens 36b. As shown in FIG. 3, the timing at which the body side command signal 402 is transmitted is different from the period of the C clock signal 401. The command signal 402 is periodically transmitted at intervals of at least about 8 milliseconds in the case of initialization processing performed when the camera system 1 is powered on (power on) or termination processing performed when the power is turned off, and is transmitted at an arbitrary timing otherwise.

[0030] When the lens side control unit 33 receives the body side command signal 402 via the lens side communication unit 34, it executes an inspection process to inspect whether there is a communication error in the body side command signal 402 using the error detection code (such as checksum data, etc.) included in the body side command signal 402. Thereafter, 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 at a high level, the body side control unit 23 does not transmit the C clock signal or the body side command signal 402. The lens-side control unit 33 starts the first control process 404 based on the instruction of the received body-side command signal 402.

[0031] When the first control process 404 is completed, the lens-side control unit 33 sets the signal level of the RDY(L) terminal to the low level (L level) via the lens-side communication unit 34 (T3). When the signal level of the RDY(B) terminal becomes the low level, the body-side control unit 23 outputs the C clock signal 405 from the CLK(B) terminal. The frequency at which the high level and the low level of the C clock signal 405 are repeated is the same as that of the C clock signal 401, for example, 8 MHz. That is, the body-side control unit 23 transmits the C clock signal 405 to the lens-side control unit 33 via the CLK(B) terminal and the CLK(L) terminal. Also, when the signal level of the RDY(B) terminal is the high level, the body-side control unit 23 does not transmit or receive the body-side data signal 406 and the lens-side data signal 407.

[0032] Synchronizing with the C clock signal 405, the body-side control unit 23 outputs the body-side data signal 406 from the DATAB(B) terminal via the body-side communication unit 24. That is, the body-side control unit 23 transmits the body-side data signal 406 to the lens-side control unit 33 via the DATAB(B) terminal and the DATAB(L) terminal. The body-side data signal 406 is a signal representing the control parameter of the body-side command signal 402. For example, when the body-side command signal 402 is a signal indicating driving of the focus lens 36b, the corresponding body-side data signal 406 is a signal representing the driving amount of the focus lens 36b. Alternatively, the body-side data signal 406 is a signal representing information (such as the model information of the camera body) required by the lens-side control unit 33 in the command data communication.

[0033] When a C clock signal 405 is input to the CLK(L) terminal, the lens-side control unit 33 outputs a lens-side data signal 407 from the DATAL(L) terminal in synchronization with the C clock signal 405. The lens-side data signal 407 indicated by the switching between the high level and the low level of DATAL in FIG. 3 is a signal that the lens-side control unit 33 transmits to the body-side control unit 23 by command data communication. For example, when the body-side command signal 402 is a signal representing a request for the model information of the interchangeable lens 3, the corresponding lens-side data signal 407 is a signal representing the model information of the interchangeable lens 3. As shown in FIG. 3, the timings at which the body-side data signal 406 and the lens-side data signal 407 are transmitted are different from the period of the C clock signal 405. The body-side data signal 406 and the lens-side data signal 407 are periodically transmitted at intervals of at least about 8 milliseconds in the case of initialization processing performed when the camera system 1 is powered on (power-on) or termination processing performed when the power is turned off, but are transmitted at arbitrary timings otherwise.

[0034] When the transmission of the lens-side data signal 407 is completed, the lens-side control unit 33 sets the signal level of the RDY(L) terminal to the high level again (T4). The lens-side control unit 33 starts the second control process 408 (described later) based on the instruction of the received body-side data signal 406.

[0035] 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 requests specific information of the interchangeable lens 3 will be described. As the first control process 404, the lens-side control unit 33 executes a process of generating the requested information as the lens-side data signal 407. The lens-side data signal 407 generated in 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.

[0036] For example, a case will be described where the received body-side command signal 402 is a signal indicating an instruction to drive the focus lens 36b. The lens-side control unit 33 executes, as a first control process 404, a process of generating a signal indicating that a signal indicating an instruction to drive the focus lens 36b has been received. The signal generated in the first control process 404 is transmitted as a lens-side data signal 407 to the body-side 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. The lens-side control unit 33 executes, as a second control process 408, a process of driving by the driving amount specified by the body-side data signal 406.

[0037] When the second control process 408 is completed by the lens-side control unit 33, the RDY(L) terminal is set to a low level via the lens-side communication unit 34 (T5).

[0038] The communication performed at the above-described timings T1 to T5 is one command data communication. In one command data communication, the body-side control unit 23 transmits the body-side command signal 402 and the body-side data signal 406. That is, the body-side command signal 402 and the body-side data signal 406 together constitute one control command (command) and control content (control data).

[0039] As described above, the lens-side control unit 33 performs in parallel the reception of the control command (command) and control content (control data) from the body-side control unit 23 and the transmission of the response content (response data) to the body-side communication unit 24. That is, the command data communication is a so-called full-duplex communication.

[0040] (Explanation of Hotline Communication) As another communication system, there is a communication for unidirectionally transmitting data from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2, which is called hotline communication. The hotline communication is data communication in which the body-side control unit 23 and the lens-side control unit 33 use the HCLK(B) terminal, HCLK(L) terminal, HDATA(B) terminal, and HDATA(L) terminal via the body-side communication unit 24 and the lens-side communication unit 34. The body-side control unit 23 acquires information regarding the state of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 by hotline communication. The information regarding the state of the interchangeable lens 3 is, for example, the position of the focus lens 36b, the position of an image stabilization lens (not shown), the driving position of the aperture blades, and the like. The image stabilization lens is a member that can move (drive) so as to include a component in a direction perpendicular to the optical axis direction, and the aperture is a member that can move (drive) so as to change the size of the aperture through which the light beam passes. This hotline communication is a communication in which, when an instruction to start communication is transmitted from the camera body via the command data communication, the lens-side control unit 33 autonomously transmits lens data to the body-side control unit 23 independently of the command data communication until an instruction to end communication is sent.

[0041] FIG. 4 is an example of a timing chart showing the timing of hotline communication. When the lens side control unit 33 receives a command for starting hotline communication from the body side control unit 23 of the camera body by command data communication (T6), it performs generation processing 501. The generation processing 501 is a process of acquiring the state of the lens at a sampling period of, for example, 1 millisecond and generating a lens signal 503 for hotline communication. When the generation of the lens signal 503 is completed (T7), the lens side control unit 33 outputs 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 transmitted to the body side control unit 23 via the HCLK(L) terminal and the HCLK(B) terminal. The frequency at which the high level and the low level of the H clock signal 502 in FIG. 4 are repeated is, for example, 2.5 MHz to 8 MHz. That is, the frequency of the H clock signal 502 for hotline communication is the same as or lower than the frequency of the C clock signal 401 for command data communication. That is, the period of the H clock signal 502 for hotline communication is the same as or longer than the period of the C clock signal 401 for command data communication.

[0042] The lens side control unit 33 outputs the lens signal 503 (for example, information regarding the position of the focus lens 36b) generated in the generation processing 501 from the HDATA(L) terminal in synchronization with the H clock signal 502 via the lens side communication unit 34. That is, the lens side control unit 33 transmits the lens signal 503 to the body side communication unit 24 of the body side control unit 23 via the lens side communication unit 34, the HDATA(L) terminal, and the HDATA(B) terminal. The lens signal 503 indicated by the switching between the high level and the low level of the HDATA in FIG. 4 is a signal transmitted from the lens side control unit 33 to the body side control unit 23 by hotline communication. The output of the H clock signal 502 and the lens signal 503 ends at timing T8. The lens-side control unit 33 repeats the transmission of lens data by hotline communication at regular intervals (e.g., 1 millisecond) until it receives an instruction to stop transmitting the lens signal 503 by command data communication. As shown in FIG. 4, the timing at which lens data is transmitted by hotline communication is different from the period of the H clock signal 502. The transmission interval of lens data by hotline communication is shorter than the transmission and reception interval of the control command (command) and control content (control data) by the aforementioned command data communication.

[0043] Command data communication and hotline communication can be executed partially or entirely in parallel. That is, the body-side control unit 23 and the lens-side control unit 33 can start or end hotline communication while performing command data communication. Also, it is possible to start or end command data communication while performing hotline communication.

[0044] As described above, hotline communication is performed independently of command communication. The lens-side control unit 33 transmits information regarding the state of the interchangeable lens 3 to the body-side control unit 23 by hotline communication regardless of command communication. Therefore, the body-side control unit 23 can continuously grasp the state of the interchangeable lens 3 even during command communication. For this reason, the body-side control unit 23 can continuously grasp the position of the focus lens 36b, and thus, for example, can control autofocus at high speed. The same applies to shake correction control and aperture control. Also, the body-side control unit 23 can give various instructions to the interchangeable lens 3 at an arbitrary timing by command communication even while the lens-side control unit 33 is performing hotline communication.

[0045] (Description of the lens mount mechanism) The camera system 1 of the present embodiment includes a so-called bayonet-type lens mount mechanism. Hereinafter, the body-side mount 21 of the camera body 2 and the lens-side mount 31 of the interchangeable lens 3 will be described in order.

[0046] FIG. 5(a) is a diagram schematically showing the mount of the camera body 2 as viewed from the side of the interchangeable lens 3. The camera body 2 includes the body-side mount 21 and the body-side terminal holding portion 22 described above with reference to FIG. 1. The body-side mount 21 has an annular reference surface having a certain width. Further, the body-side mount 21 has a body-side first claw portion 29a, a body-side second claw portion 29b, a body-side third claw portion 29c, and a body-side fourth claw portion 29d. In the following description, these four claw portions are collectively referred to as the body-side claw portions 29.

[0047] The body-side claw portions 29 are arranged at intervals along the circular opening of the body-side mount 21. As shown in FIG. 5(a), the body-side first claw portion 29a is located at the upper right position, the body-side second claw portion 29b is located at the upper left position, the body-side third claw portion 29c is located at the lower left position, and the body-side fourth claw portion 29d is located at the lower right position.

[0048] The circumferential lengths of the body-side first claw portion 29a to the body-side fourth claw portion 29d are different from each other. Specifically, the body-side first claw portion 29a is the longest, the body-side third claw portion 29c is the second longest, the body-side fourth claw portion 29d is the third longest, and the body-side second claw portion 29b is the shortest.

[0049] The body-side claw portions 29 protrude from the body-side mount 21 toward the center of the opening, and on the circumference of the opening, there are portions where the body-side claw portions 29 are present and portions where the body-side claw portions 29 are not present. In the following description, the space 40a between the body-side first claw portion 29a and the body-side fourth claw portion 29d on the circumference of the opening of the body-side mount 21 is referred to as the body-side first insertion / removal portion 40a. Similarly, the space 40b between the body-side first claw portion 29a and the body-side second claw portion 29b is referred to as the body-side second insertion / removal portion 40b, the space 40c between the body-side second claw portion 29b and the body-side third claw portion 29c is referred to as the body-side third insertion / removal portion 40c, and the space 40d between the body-side third claw portion 29c and the body-side fourth claw portion 29d is referred to as the body-side fourth insertion / removal portion 40d. These four body-side insertion / removal portions are collectively referred to as the body-side insertion / removal portions 40.

[0050] Inside the opening of the body-side mount 21, a body-side terminal holding portion 22 is provided. The body-side terminal holding portion 22 has an arc shape corresponding to the shape of the annular body-side mount 21. The body-side terminal holding portion 22 is arranged parallel to the opening of the body-side mount 21 and preferably at the upper part of the opening of the body-side mount 21, and is arranged at the center of the upper part as shown in Fig. 5(a). The body-side terminal holding portion 22 has a plurality of body-side terminals as described above. The plurality of body-side terminals are arranged in an arc shape in a row inside the body-side mount 21 in the body-side terminal holding portion 22. As shown in Fig. 5(a), the eleven terminals of HDATA(B), HCLK(B), DATAL(B), CLK(B), DATAB(B), RDY(B), GND(B), V33(B), PGND(B), VBAT(B) are arranged from the right side, and LDET(B) is arranged at the leftmost side. The body-side terminal group is a conductive pin respectively. The body-side terminal group is pushed in the -Z direction (Fig. 1) by a spring or the like (not shown). The -Z direction is the direction toward the interchangeable lens 3 attached to the camera, which is the direction of the subject.

[0051] The body-side mount 21 has a hole through which the lock pin 42 passes. The hole through which the lock pin 42 passes is arranged at the upper right of the body-side fourth claw portion 29d. That is, on the annular reference surface of the body-side mount 21, the hole of the lock pin 42 is arranged between the region where the body-side fourth claw portion 29d exists and the region where the body-side first claw portion 29a exists within the opening of the body-side mount 21. The lock pin 42 is pushed in the -Z direction (Fig. 1) by a spring or the like (not shown).

[0052] FIG. 5(b) is a schematic view of the mount of the camera body 2 with the body-side mount 21 removed, as seen from the interchangeable lens 3 side. A first leaf spring 41a is provided at a position corresponding to the body-side first claw portion 29a (on the back side of the body-side first claw portion 29a). Similarly, a second leaf spring 41b is provided at a position corresponding to the body-side second claw portion 29b (on the back side of the body-side second claw portion 29b), a third leaf spring 41c is provided at a position corresponding to the body-side third claw portion 29c (on the back side of the body-side third claw portion 29c), and a fourth leaf spring 41d is provided at a position corresponding to the body-side fourth claw portion 29d (on the back side of the body-side fourth claw portion 29d). In the following description, these four leaf springs are collectively referred to as the leaf spring 41. The leaf spring 41 presses the lens-side claw portion described later in the +Z direction (toward the camera body 2 side).

[0053] FIG. 6 is a diagram schematically showing the mount of the interchangeable lens 3 as seen from the camera body 2 side. The interchangeable lens 3 includes the lens-side mount 31 and the lens-side terminal holding portion 32 described above with reference to FIG. 1. The lens-side mount 31 has an annular reference surface with a certain width. When the interchangeable lens 3 is attached to the camera body 2, the annular reference surface of the lens-side mount 31 contacts the annular reference surface of the body-side mount 21 described above. Further, the lens-side mount 31 has a cylindrical portion extending in the optical axis direction on its inner periphery. The lens-side mount 31 has a lens-side first claw portion 39a, a lens-side second claw portion 39b, a lens-side third claw portion 39c, and a lens-side fourth claw portion 39d spaced apart from each other along the outer periphery of the cylindrical portion. In the following description, these four claw portions are collectively referred to as the lens-side claw portion 39.

[0054] The lens-side claw portion 39 is provided in a direction protruding from the outer periphery of the cylindrical portion of the lens-side mount 31 toward the outside of the mount (radial direction from the optical axis O). As shown in FIG. 6, the lens-side first claw portion 39a is located at the upper left position, the lens-side second claw portion 39b is located at the upper right position, the lens-side third claw portion 39c is located at the lower right position, and the lens-side fourth claw portion 39d is located at the lower left position, respectively. There is a space on the rear side of the lens-side claw portion 39 (on the reference surface side of the lens-side mount 31) for the corresponding body-side claw portion 29 to enter when the interchangeable lens 3 is attached to the camera body 2.

[0055] Inside the opening of the lens-side mount 31, a lens-side terminal holding portion 32 is provided. The lens-side terminal holding portion 32 has an arc shape corresponding to the shape of the annular lens-side mount 31. The lens-side terminal holding portion 32 is arranged parallel to the opening of the lens-side mount 31 and is preferably arranged at the upper part of the lens-side mount 31 and at the center of the upper part as shown in FIG. 6. The lens-side terminal holding portion 32 has a plurality of lens-side terminals as described above. The plurality of lens-side terminals are arranged in an arc shape in a row inside the lens-side mount 31 on the lens-side terminal holding portion 32. As shown in FIG. 6, eleven terminals of LDET(L), VBAT(L), PGND(L), V33(L), GND(L), RDY(L), DATAB(L), CLK(L), DATAL(L), HCLK(L), and HDATA(L) are arranged from the right side for the plurality of lens-side terminals. The lens-side terminal group is arranged such that the conductive contact surfaces thereof are exposed in the +Z direction (FIG. 1). The +Z direction is the direction in which the subject light that has passed through the imaging optical system 36 travels toward the imaging element 27.

[0056] The lens-side mount 31 has a lock pin receiving portion 43. The lock pin receiving portion 43 is arranged at the upper left of the lens-side fourth claw portion 39d as shown in FIG. 6. That is, the lock pin receiving portion 43 is arranged between the portion of the lens-side mount 31 corresponding to the lens-side first claw portion 39a and the portion corresponding to the lens-side fourth claw portion 39d. The lock pin receiving portion 43 is a groove in which the lock pin 42 fits when the interchangeable lens 3 is attached to the camera body 2. This groove is provided in the -Z direction (FIG. 1).

[0057] When the interchangeable lens 3 is attached to the camera body 2, the plurality of body-side terminals physically contact the corresponding plurality of lens-side terminals. By this contact, the plurality of body-side terminals and the plurality of lens-side terminals are electrically connected. That is, the plurality of body-side terminals and the plurality of lens-side terminals are electrically conductive.

[0058] (Attachment of Interchangeable Lens) The method of attaching the interchangeable lens 3 to the camera body 2 will be described. When attaching the interchangeable lens 3 to the camera body 2, first, align the body-side mount 21 and the lens-side mount 31 so that the lens-side first claw portion 39a is aligned with the position of the body-side first insertion / removal portion 40a, the lens-side second claw portion 39b is aligned with the position of the body-side second insertion / removal portion 40b, the lens-side third claw portion 39c is aligned with the position of the body-side third insertion / removal portion 40c, and the lens-side fourth claw portion 39d is aligned with the position of the body-side fourth insertion / removal portion 40d. Then, insert the lens-side first claw portion 39a into the body-side first insertion / removal portion 40a, insert the lens-side second claw portion 39b into the body-side second insertion / removal portion 40b, insert the lens-side third claw portion 39c into the body-side third insertion / removal portion 40c, and insert the lens-side fourth claw portion 39d into the body-side fourth insertion / removal portion 40d. At this time, the LDET(L) terminal contacts the CLK(B) terminal, the VBAT(L) terminal contacts the DATAL(B) terminal, the PGND(L) terminal contacts the HCLK(B) terminal, and the V33(L) terminal contacts the HDATA(B) terminal respectively.

[0059] From that state, rotate the interchangeable lens 3 in the mounting direction 44 shown in FIGS. 5 and 6. That is, the body-side first claw portion 29a enters the space behind the lens-side first claw portion 39a, the body-side second claw portion 29b enters the space behind the lens-side second claw portion 39b, the body-side third claw portion 29c enters the space behind the lens-side third claw portion 39c, and the body-side fourth claw portion 29d enters the space behind the lens-side fourth claw portion 39d. At this time, the plurality of lens-side terminals come into contact with the plurality of body-side terminals in order. Note that the camera body 2 may be rotated in the direction opposite to the mounting direction 44 shown in FIGS. 5 and 6 instead of the interchangeable lens 3.

[0060] When the lens-side claw portions 39 are inserted into the corresponding body-side insertion / extraction portions 40 and rotated in the mounting direction 44, for example, the LDET(L) terminal contacts the CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, GND(B) terminal, V33(B) terminal, PGND(B) terminal, VBAT(B) terminal, and LDET(B) terminal in this order. For example, the VBAT(L) terminal contacts the DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, GND(B) terminal, V33(B) terminal, PGND(B) terminal, and VBAT(B) terminal in this order. For example, the PGND(L) terminal contacts the HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, GND(B) terminal, V33(B) terminal, and PGND(B) terminal in this order. For example, the V33(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, GND(B) terminal, and V33(B) terminal in this order. For example, the GND(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, RDY(B) terminal, and GND(B) terminal in this order.

[0061] For example, the RDY(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, DATAB(B) terminal, and RDY(B) terminal in this order. For example, the DATAB(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, CLK(B) terminal, and DATAB(B) terminal in this order. For example, the CLK(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, DATAL(B) terminal, and CLK(B) terminal in this order. For example, the DATAL(L) terminal contacts the HDATA(B) terminal, HCLK(B) terminal, and DATAL(B) terminal in this order. For example, the HCLK(L) terminal contacts the HDATA(B) terminal and HCLK(B) terminal in this order.

[0062] When the interchangeable lens 3 is rotated by a predetermined angle with respect to the camera body 2, the fully mounted position is reached. At the fully mounted position, the corresponding body-side claw portion 29 and lens-side claw portion 39 face each other in the optical axis direction, and the lock pin 42 is pushed in the -Z direction in FIG. 1 and enters the lock pin receiving portion 43. When the lock pin 42 enters the lock pin receiving portion 43, the interchangeable lens 3 cannot be rotated with respect to the camera body 2. That is, when the body-side claw portion 29 and the lens-side claw portion 39 reach the predetermined fully mounted position, the relative position between the body-side mount 21 and the lens-side mount 31 is fixed. The lens-side claw portion 39 is pushed toward the body side (the +Z direction in FIG. 1) by the leaf spring 41. As a result, each of the plurality of lens-side terminals comes into contact with each of the corresponding plurality of body-side terminals and is electrically connected.

[0063] In the following description, the state in which the body-side claw portion 29 and the lens-side claw portion 39 reach the predetermined fully mounted position is referred to as the fully mounted state. The state during rotation from the position where the lens-side claw portion 39 is inserted into the body-side insertion / removal portion 40 to immediately before the fully mounted position, or the state during rotation from immediately before the fully mounted position to the insertion position is referred to as the mounting state.

[0064] In the mounting state, the signal level of the LDET(B) terminal is pulled up and is at a high level. When the body-side control unit 23 detects that the signal level of the LDET(B) terminal is at a high level, it determines that the interchangeable lens 3 is not mounted. When the interchangeable lens 3 is not mounted, the body-side control unit 23 causes the power supply unit 26 not to supply power to the VBAT(B) terminal and the V33(B) terminal.

[0065] When in the mounted state, as described above (Figure 2), the signal level of the LDET(B) terminal is pulled down to a low level. When the body-side control unit 23 detects that the signal level of the LDET(B) terminal has become low, it determines that the interchangeable lens 3 has been mounted. Also, in the mounted state, the lock pin 42 enters the lock pin receiving part 43, and the switch 28 (Figure 1) interlocked with the lock pin 42 is turned on. When the body-side control unit 23 detects that the signal level of the LDET(B) terminal has become low and that the switch 28 has been turned on, it starts supplying power to the V33(B) terminal by the power supply unit 26, that is, supplies the power supply voltage of the circuit system. Note that the camera body 2 does not necessarily have to be equipped with the switch 28. When not equipped with the switch 28, power supply to the V33(B) terminal may be started by the power supply unit 26 when it is detected that the signal level of the LDET(B) terminal has become low.

[0066] When power supply to the V33(B) terminal is started, the power supply voltage is supplied to the lens-side control unit 33 of the interchangeable lens 3 through the V33(L) terminal, and the lens-side control unit 33 starts operating. The lens-side control unit 33 that has started operating permits initial communication by command data communication with the body-side control unit 23. After the lens-side control unit 33 permits the initial communication, the body-side control unit 23 starts the initial communication. The initial communication includes a signal for requesting power supply to the VBAT(L) terminal by the lens-side control unit 33. When the signal for requesting power supply to the VBAT(L) terminal is transmitted from the lens-side control unit 33 to the body-side control unit 23, the body-side control unit 23 supplies the power supply voltage to the VBAT(B) terminal, and initialization processing between the camera body 2 and the interchangeable lens 3 is performed. In the initialization processing, information necessary for various operations of the camera system 1, such as a photographing operation and a focus adjustment operation, is exchanged between the camera body 2 and the interchangeable lens 3, or the lens position of the interchangeable lens is moved to a reference position.

[0067] When the user presses an unlocking button (not shown) on the camera body in the fully mounted state, the locking pin 42 retracts from the locking pin receiving portion 43. As a result, the relative position between the body side mount 21 and the lens side mount 31 can be changed. When the user presses the unlocking button (not shown), the body side control unit 23 turns off a switch 28 interlocked with the unlocking button and stops the power supply from the power supply unit 26 to the VBAT(B) terminal and the V33(B) terminal. From this state, when the interchangeable lens 3 is rotated in a direction opposite to the mounting direction 44 shown in FIGS. 5 and 6, the plurality of lens side terminals come into contact with the plurality of body side terminals in the reverse order as described above.

[0068] Note that it is not necessary to stop the power supply in conjunction with the operation of the unlocking button. In this case, when the body side control unit 23 detects that the LDET(L) terminal and the LDET(B) terminal are separated and the signal level of the LDET(B) terminal changes from a low level to a high level due to the rotation of the interchangeable lens 3 in a direction opposite to the mounting direction 44, the body side control unit 23 stops the power supply from the power supply unit 26 to the VBAT(B) terminal and the V33(B) terminal. By doing so, the number of components of the camera system 1 can be reduced. Also, when both the unlocking button is pressed and the signal level of the LDET(B) terminal changes from a low level to a high level are detected, the power supply from the power supply unit 26 to the VBAT(B) terminal and the V33(B) terminal may be stopped. Alternatively, when either the unlocking button is pressed or the signal level of the LDET(B) terminal changes from a low level to a high level is detected, the body side control unit 23 may stop the power supply from the power supply unit 26 to the VBAT(B) terminal and the V33(B) terminal.

[0069] As described above, during the attachment and detachment (mounted state) of the interchangeable lens to the camera body, the lens side terminals come into contact with the body side terminals other than the terminals to be corresponded to at the time of complete attachment. It is desirable that the arrangements of the lens side terminals and the body side terminals have few problems caused by such contact during the attachment and detachment.

[0070] (Terminal Arrangement Considering Noise) In this embodiment, the LDET(B) terminal among a plurality of body-side terminals is arranged at the forefront in the lens mounting direction (arrow 44 in Fig. 5(a)). That is, the arrangement position of the LDET(B) terminal is the leftmost in the body-side terminal group in Fig. 5(a) as described above. Among the plurality of lens-side terminals, the LDET(L) terminal is also arranged at the forefront in the lens mounting direction (arrow 44 in Fig. 6). That is, the arrangement position of the LDET(L) terminal is the rightmost in the lens-side terminal group in Fig. 6 as described above. Therefore, until the mounting of the mounted lens is completed, the LDET(B) terminal does not contact the lens-side terminals other than the LDET(L) terminal. Therefore, the signal level of the LDET(B) terminal does not erroneously become low during the mounting process of the interchangeable lens, and the lens mounting is not erroneously recognized.

[0071] In this embodiment, the VBAT(B) terminal is arranged next to the LDET(B) terminal, that is, the second from the forefront in the mounting direction. The VBAT(L) terminal is arranged next to the LDET(L) terminal, that is, the second from the forefront 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 the lens mounting process. Since the power supply voltage of the drive system applied to the VBAT(B) terminal is higher than that of other terminals, if the VBAT(B) terminal contacts a terminal other than the VBAT(L) terminal under the situation where a high voltage is erroneously applied to the VBAT(B) terminal due to a failure of the camera system 1 or the like, this high voltage may impose an unexpected load on the electric circuit in the interchangeable lens. In this embodiment, since the VBAT(B) terminal is located next to the LDET(B) terminal, only the LDET(L) terminal among the plurality of lens-side terminals contacts the VBAT(B) terminal during the mounting of the interchangeable lens 3. As shown in Fig. 2, the LDET(L) terminal is grounded via the resistor R3, and even if a high voltage is applied from the VBAT(B) terminal, it does not affect the camera system 1.

[0072] In this embodiment, the PGND(B) terminal, which is at the ground potential, is arranged adjacent to the VBAT(B) terminal, that is, the third from the foremost end in the mounting direction. The PGND(L) terminal is arranged adjacent to the VBAT(L) terminal, that is, the third from the foremost end in the mounting direction. The high voltage supplied from the VBAT(B) terminal is accumulated as charge in the capacitor C1 connected to the VBAT(L) terminal. When the interchangeable lens 3 is rotated in the removal direction, the VBAT(L) terminal first contacts the PGND(B) terminal. The charge accumulated in the capacitor C1 is quickly discharged from the PGND(B) terminal, which is at the ground potential, and does not affect other circuits of the camera system 1.

[0073] In this embodiment, the V33(B) terminal is arranged adjacent to the PGND(B) terminal, that is, the fourth from the foremost end in the mounting direction, and the GND(B) terminal is arranged adjacent to it, that is, the fifth from the foremost end. The V33(L) terminal is arranged adjacent to the PGND(L) terminal, that is, the fourth from the foremost end in the mounting direction, and the GND(L) terminal is arranged adjacent to it, that is, the fifth from the foremost end. The voltage supplied from the V33(B) terminal is accumulated as charge in the capacitor C2 connected to the V33(L) terminal. When the interchangeable lens 3 is rotated in the removal direction, the V33(L) terminal first contacts the GND(B) terminal. The charge accumulated in the capacitor C2 is quickly discharged from the GND(B) terminal, which is at the ground potential, and does not affect other circuits of the camera system 1.

[0074] The RDY(B) terminal is arranged adjacent to the GND(B) terminal, that is, the sixth from the foremost end, the DATAB(B) terminal is arranged adjacent to it, that is, the seventh from the foremost end, the CLK(B) terminal is arranged adjacent to it, that is, the eighth from the foremost end, the DATAL(B) terminal is arranged adjacent to it, that is, the ninth from the foremost end, the HCLK(B) terminal is arranged adjacent to it, that is, the tenth from the foremost end, and the HDATA(B) terminal is arranged at the last end adjacent to it.

[0075] Place the RDY(L) terminal adjacent to the GND(L) terminal, i.e., the sixth from the front end. Place the DATAB(L) terminal adjacent to it, i.e., the seventh from the front end. Place the CLK(L) terminal adjacent to that, i.e., the eighth from the front end. Place the DATAL(L) terminal adjacent to that, i.e., the ninth from the front end. Further, place the HCLK(L) terminal adjacent to that, i.e., the tenth from the front end. Place the HDATA(L) terminal at the last end adjacent to it.

[0076] Next, describe the influence of noise caused by communication lines composed of each body-side terminal and each lens-side terminal. Hot-line communication is a communication that unidirectionally transmits information (lens data) to the body after the start of communication and is performed frequently (repeated at a very short cycle). During hot-line communication, a clock signal (H clock signal) is sent from the HCLK(L) terminal to the HCLK(B) terminal. Since the clock signal is a signal that repeats high and low levels in a short cycle, it can be a large noise source for other signals. Furthermore, since the clock signal transmitted from the HCLK(L) terminal to the HCLK(B) terminal is a signal output from the interchangeable lens 3, the camera body 2 side cannot recognize the noise even if the clock signal is accidentally noisy. Thus, there is a possibility that the clock signal (H clock signal) flowing through the HCLK terminal becomes a noise source or that the clock signal (H clock signal) is noisy, which may cause malfunction of the camera system 1. Examples of malfunctions include incorrect detection of the attachment of the interchangeable lens and misjudgment of the availability of command communication.

[0077] In this embodiment, the HCLK terminal is placed at a position far from the VBAT terminal with a high voltage applied. Since the voltage and current of the VBAT terminal that drives the drive unit 37 of the interchangeable lens 3 vary depending on the drive state of the drive unit 37, the voltage and current fluctuations of the VBAT terminal may become noise for other terminals. Therefore, by separating the VBAT terminal from the HCLK terminal, it is possible to suppress the influence of noise caused by the voltage and current fluctuations of the VBAT terminal on the clock signal (H clock signal). It is possible to suppress the clock signal (H clock signal) from being noisy. The RDY terminal is a terminal used to indicate the availability of command communication. The HCLK terminal, which can be a noise source, is placed away from the RDY terminal so as not to be adjacent to it. Therefore, it is possible to suppress the influence of noise from the clock signal (H clock signal) on the signal of the RDY terminal.

[0078] Also, the HDATA terminal and the DATAL terminal are placed on both sides adjacent to the HCLK terminal. By doing so, it is possible to suppress the influence of the noise of the HCLK terminal on terminals other than the HDATA terminal and the DATAL terminal. The signals flowing through the HDATA terminal and the DATAL terminal fluctuate less than the clock signal (H clock signal). Therefore, it is possible to suppress the influence of the fluctuation of the clock signal (H clock signal) from reaching terminals other than the HDATA terminal and the DATAL terminal.

[0079] Next, the command data communication is a communication for transmitting and receiving information bidirectionally between the body and the interchangeable lens as described above. During the command data communication, a clock signal (C clock signal) is sent from the CLK(B) terminal to the CLK(L) terminal. The clock signal transmitted at the CLK terminal can also be a noise source for the same reason as described above. Also, if noise is added to the clock signal (C clock signal), an abnormality will occur in the command communication. Therefore, in the present embodiment, the CLK terminal is placed at a position away from the VBAT terminal to which a high voltage is applied. Since the voltage and current of the VBAT terminal that drives the drive unit 37 of the interchangeable lens 3 vary depending on the drive state of the drive unit 37, the variation in the voltage and current of the VBAT terminal may be noise for other terminals. Therefore, by separating the VBAT terminal from the CLK terminal, it is possible to suppress the influence of the noise of the VBAT terminal on the clock signal (C clock signal). That is, it is possible to suppress noise from being added to the clock signal (C clock signal). Also, the CLK terminal is placed away from the RDY terminal used to indicate the availability of command communication so as not to be adjacent to it.

[0080] Also, if the HCLK terminal and the CLK terminal are adjacent to each other, one clock signal may affect the other clock signal and become a noise source. In the present embodiment, the DATAL terminal is arranged between the CLK terminal and the HCLK terminal. Also, the DATAB terminal is arranged between the CLK terminal and the RDY terminal. That is, the DATAL terminal and the DATAB terminal are arranged on both sides of the CLK terminal. By doing so, the influence of the noise caused by the CLK terminal on the camera system can be suppressed. Since the signals flowing through the DATAL terminal and the DATAB terminal fluctuate less than the clock signal (C clock signal), the influence of the fluctuation of the clock signal (C clock signal) can be suppressed from reaching terminals other than the DATAL terminal and the DATAB terminal. When the DATAL terminal is arranged between the CLK terminal and the HCLK terminal, the signal flowing through the DATAL terminal fluctuates less than the clock signal (C clock signal) of the CLK terminal and the clock signal (H clock signal) of the HCLK terminal. Therefore, the influence of the fluctuation of the clock signal (C clock signal) of the CLK terminal on the clock signal (H clock signal) of the HCLK terminal and the influence of the fluctuation of the clock signal (H clock signal) of the HCLK terminal on the clock signal (C clock signal) of the CLK terminal can be suppressed.

[0081] Also, as described above, it is necessary to determine the level of the RDY terminal in order to perform command data communication. That is, since the signal level of the RDY terminal indicates whether command data can be communicated, the influence of noise on the shooting operation is significant. Here, consider the case where the body side control unit 23 misrecognizes that communication is possible due to noise even though command data cannot be communicated. In this case, the lens side control unit 33 cannot receive the command data, but the body side control unit 23 transmits the command data, and the body side control unit 23 misrecognizes that control according to the command data is performed by the interchangeable lens. However, since the lens side control unit 33 cannot accept the command data, control according to the erroneously transmitted command data is not performed. Therefore, the operation of the camera system 1 is impaired. Therefore, it is necessary to prevent noise from being applied to the signal of the RDY terminal. In order to prevent noise from being applied to the signal of the RDY terminal, it is desirable to arrange terminals through which a relatively stable signal, that is, a signal with little change in signal level per unit time, flows on both sides adjacent to the RDY terminal. In the present embodiment, a GND terminal and a DATAB terminal are arranged on both sides adjacent to the RDY terminal. Since the GND terminal is a terminal at the ground potential, it is stable, and the DATAB terminal is also a terminal through which a more stable signal flows than the CLK terminal and the HCLK terminal. By doing so, the influence of noise received by the signal of the RDY terminal can be suppressed.

[0082] Next, the power supplied from the VBAT(B) terminal to the VBAT(L) terminal (the power supply voltage of the drive system) is used to drive the actuator (such as a stepping motor, etc.) of the drive unit 37 of the interchangeable lens 3. Therefore, the current flowing through the VBAT terminal varies greatly when the actuator is driving and when it is not driving. Such current fluctuations become a noise source for the signals flowing through other terminals. In the present embodiment, the VBAT terminal is arranged at a position separated from the RDY terminal, DATAB terminal, CLK terminal, DATAL terminal used for command data communication, and the HCLK terminal and HDATA terminal used for hot line communication. Further, GND terminals, V33 terminals, and PGND terminals are arranged between the VBAT terminal and the terminals used for these communications. Among these, in particular, the GND terminal and the PGND terminal are terminals of the ground potential, so the influence of noise can be suppressed. Thereby, the influence of the noise caused by the fluctuations of the current flowing through the VBAT terminal on the data communication is suppressed.

[0083] Here, the terminal arrangement considering the noise described above is summarized. The RDY terminal is arranged at a distance so as not to be adjacent to either the VBAT terminal or the HCLK terminal, which are noise sources. Thereby, the influence of noise on the RDY terminal used to indicate the availability of command communication can be suppressed. The HCLK terminal, which is 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, they are arranged in the order of HDATA terminal, HCLK terminal, DATAL terminal, CLK terminal, DATAB terminal from the rear end in the mounting direction. Thereby, the influence of noise caused by the clock signal on the RDY terminal and the like can be suppressed. Furthermore, considering the influence of noise, the power supply terminal group and the terminal group used for communication are arranged separately with the RDY terminal in between. Specifically, with the RDY terminal in between, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal, which are power supply terminals, are arranged in order from the tip side in the mounting direction, and the DATAB terminal, CLK terminal, DATAL terminal, HCLK terminal, and HDATA terminal, which are terminals used for communication, are arranged in order from the tip side on the rear end side in the mounting direction. Thereby, the influence of the power supply system terminal group such as the VBAT terminal on the terminals used for communication can be suppressed. Also, the influence of noise on the RDY terminals of the power supply system terminal group such as the VBAT terminal and the terminal group used for communication such as the HCLK terminal and CLK terminal can be suppressed.

[0084] For the HCLK terminal through which the clock signal (H clock signal) used for hotline communication is sent and the CLK terminal through which the clock signal (C clock signal) used for command data communication is sent, the HCLK terminal is arranged at a position farther from the VBAT terminal than the CLK terminal. This is because the clock signal (C clock signal) sent to the interchangeable lens at the CLK terminal is output by the body side control unit 23 via the body side communication unit 24, but if noise is added to the clock signal (H clock signal) sent from the interchangeable lens to the camera body via the lens side communication unit 34 and the HCLK(L) terminal, the body side control unit 23 will misrecognize it. Therefore, the influence of the noise on the clock signal (H clock signal) of the HCLK terminal on the camera system 1 is greater. For the HCLK terminal and the GND terminal, the HCLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. Thereby, the noise caused by the VBAT terminal to the HCLK terminal through which the clock signal (H clock signal) used for hotline communication is sent can be shielded. For the CLK terminal and the GND terminal, the CLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Further, a PGND terminal is arranged between the GND terminal and the VBAT terminal. Thereby, it is possible to shield the noise caused by the VBAT terminal to the CLK terminal to which the clock signal (C clock signal) used for command data communication is sent.

[0085] (Terminal arrangement considering wear) Hereinafter, the contact of each terminal when the interchangeable lens 3 is attached to and detached from the camera body 2 will be described. When the interchangeable lens 3 is attached to the camera body 2, the body-side terminals come into contact with the lens-side terminals one after another. The same applies when the interchangeable lens 3 is removed from the camera body 2. That is, the body-side terminals, which are pins protruding from the body-side terminal holding portion 22, and the lens-side terminals, which are exposed conductive contact surfaces, rub against each other one after another. Since a plurality of interchangeable lenses are attached to and detached from one camera body, the body-side terminals are more likely to wear than the lens-side terminals. In particular, the body-side terminals located on the rear end side in the mounting direction of the interchangeable lens 3 are rubbed against a larger number of lens-side terminals and have more friction. Therefore, the tip of the pin of the body-side terminals located on the rear end side wears more easily than the body-side terminals located on the front end side. Since the wear of the body-side terminals affects the contact with the lens-side terminals, there is a possibility that data communication becomes unstable. In the present embodiment, since the LDET(B) terminal is arranged at the most front end in the mounting direction, the wear of the LDET(B) terminal is the least. Thereby, the LDET(B) terminal and the LDET(L) terminal are in good contact, and the possibility of erroneously detecting the attachment and detachment of the interchangeable lens 3 is small.

[0086] As described above, in the present embodiment, in order to suppress the influence of noise on communication, the CLK(B) terminal and the HCLK(B) terminal are arranged at positions away from the VBAT(B) terminal. That is, the VBAT(B) terminal is arranged second from the tip side in the mounting direction, and the CLK(B) terminal and the HCLK(B) terminal are arranged on the rear end side away from the VBAT(B) terminal. Therefore, the CLK(B) terminal and the HCLK(B) terminal are more worn than the LDET(B) terminal and the VBAT(B) terminal. In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged immediately beside the first body-side claw portion 29a. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at positions closer to the inner peripheral edge, which is the inner peripheral side edge of the first body-side claw portion 29a, than the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner peripheral edge of the first body-side claw portion 29a is shorter than the distance between the VBAT(B) terminal and the inner peripheral edge of the first body-side claw portion 29a, and the distance between the HCLK(B) terminal and the inner peripheral edge of the first body-side claw portion 29a is also shorter than the distance between the VBAT(B) terminal and the inner peripheral edge of the first body-side claw portion 29a. As described above, there is a first leaf spring 41a on the back side of the first body-side claw portion 29a, and the first leaf spring 41a presses the first lens-side claw portion 39a in the +Z direction (FIG. 1). Also, 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. The LDET(B) terminal is the same as the VBAT(B) terminal, and the distance between the CLK(B) terminal and the first leaf spring 41a, and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the LDET(B) terminal and the first leaf spring 41a. By doing so, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly against the lens-side terminals than the VBAT(B) terminal and the LDET(B) terminal.

[0087] Also on the lens side, the CLK(L) terminal and the HCLK(L) terminal were arranged at positions closer to the inner peripheral edge of the first lens-side claw portion 39a than the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a is shorter than the distance between the VBAT(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a, and the distance between the HCLK(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a is also shorter than the distance between the VBAT(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal beside the first lens-side claw portion 39a are pressed against the corresponding body-side terminals by the first leaf spring 41a in the fully mounted state. Also, the LDET(L) terminal is the same as the VBAT(L) terminal, and 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. By arranging them in this way, the pressing force of the CLK(L) terminal and the HCLK(L) terminal against the body-side terminals is stronger than that of the LDET(L) terminal in the fully mounted state. As a result, even if the CLK(B) terminal or the HCLK(B) terminal wears out, good contact can be maintained, the respective clock signals are stabilized, and stable data communication can be performed. Also, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while maintaining the fully mounted state, the contact between the CLK(B) terminal and the CLK(L) terminal and the contact between the HCLK(B) terminal and the HCLK(L) terminal are maintained.

[0088] Even if a part of the lens-side first claw portion 39a is cut out, the entire portion including the protruding portion and the cut-out portion arranged in the region facing the body-side first claw portion 29a is defined as the lens-side first claw portion. As for the method of cutting out, the lens-side claw portion may be cut out so as to be divided into two or more parts in the circumferential direction, it may be cut out so as to lack a part of the lens-side claw portion, or at least a part of the lens-side claw portion may be cut out so that the length in the radial direction becomes shorter. Also, the circumferential length of the lens-side claw portion may be changed within the range passing through the corresponding body-side insertion / extraction portion. The same applies to the lens-side second claw portion 39b, the lens-side third claw portion 39c, and the lens-side fourth claw portion 39d. Also, the thickness in the radial direction of the cylindrical portion can be appropriately changed, and it may have a shape in which at least a part protrudes inward from the cylindrical portion of the present embodiment.

[0089] As described above, the CLK(B) terminal and the HCLK(B) terminal are more worn than the LDET(B) terminal and the VBAT(B) terminal. In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged immediately beside the body-side first claw portion 29a. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the inner peripheral edge of the body-side first claw portion 29a than the LDET(B) terminal and the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner peripheral edge of the body-side first claw portion 29a is shorter than the distance between the LDET(B) terminal and the VBAT(B) terminal and the inner peripheral edge of the body-side first claw portion 29a, and the distance between the HCLK(B) terminal and the inner peripheral edge of the body-side first claw portion 29a is shorter than the distance between the LDET(B) terminal and the VBAT(B) terminal and the inner peripheral edge of the body-side first claw portion 29a. As described above, there is a first leaf spring 41a on the back side of the body-side first claw portion 29a, and the first leaf spring 41a presses the lens-side first claw portion 39a in the +Z direction (FIG. 1). Also, from the viewpoint of the first leaf spring 41a, both 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 shorter than the distance between the LDET(B) terminal and the VBAT(B) terminal and the first leaf spring 41a.

[0090] On the lens side as well, the CLK(L) terminal and the HCLK(L) terminal are arranged at positions closer to the inner peripheral edge of the first lens-side claw portion 39a than the LDET(L) terminal and the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a is shorter than the distance between the LDET(L) terminal or the VBAT(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a, and the distance between the HCLK(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a is shorter than the distance between the LDET(L) terminal or the VBAT(L) terminal and the inner peripheral edge of the first lens-side claw portion 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the first lens-side claw portion 39a are pressed against the corresponding body-side terminals by the first leaf spring 41a respectively. By doing so, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly against the lens-side terminals than the LDET(B) terminal and the VBAT(B) terminal. As a result, even if the CLK(B) terminal and the HCLK(B) terminal are worn, good contact can be maintained and stable communication can be performed. Also, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while maintaining the mounted state, the contact between the CLK(B) terminal and the HCLK(B) terminal and the lens-side terminals is maintained.

[0091] In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are also near the fourth body-side claw portion 29d. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at positions closer to the fourth body-side claw portion 29d than the VBAT(B) terminal and the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the fourth body-side claw portion 29d is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth body-side claw portion 29d, and the distance between the HCLK(B) terminal and the fourth body-side claw portion 29d is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth body-side claw portion 29d. As described above, there is a fourth leaf spring 41d on the back side of the fourth body-side claw portion 29d, and the fourth leaf spring 41d presses the fourth lens-side claw portion 39d in the +Z direction (FIG. 1). Therefore, the CLK(B) terminal and the HCLK(B) terminal near the fourth lens-side claw portion 39d are pressed more stably and strongly against the lens-side terminals than the VBAT(B) terminal and the LDET(B) terminal by the first leaf spring 41a and the fourth leaf spring 41d.

[0092] The distance between the aforementioned CLK(B) terminal and the first body-side claw portion 29a (the same applies to the fourth body-side claw portion 29d, which will be omitted hereinafter) refers to the straight-line distance between one end of the first body-side claw portion 29a and the CLK(B) terminal, and it may also be defined by the straight-line distance between the other end of the first body-side claw portion 29a and the CLK(B) terminal. Alternatively, the distance between the aforementioned CLK(B) terminal and the first body-side claw portion 29a may be defined by the straight-line distance between the intermediate position of the first body-side claw portion 29a in the circumferential direction of the body-side mount 21 and the CLK(B) terminal. The distances between other body-side terminals, such as the HCLK(B) terminal, VBAT(B) terminal, and LDET(B) terminal, and the first body-side claw portion 29a are also straight-line distances. The distance between the first leaf spring 41a (the fourth leaf spring 41d) and the body-side terminal is also a straight-line distance.

[0093] Incidentally, the distance between the aforementioned CLK(B) terminal and the first body-side claw portion 29a (the same applies to the fourth body-side claw portion 29d, which will be omitted hereinafter) may be defined as the arc-shaped distance between one end of the first body-side claw portion 29a in the circumferential direction of the body-side mount 21 and the CLK(B) terminal, or it may be defined as the arc-shaped distance between the other end of the first body-side claw portion 29a and the CLK(B) terminal. Alternatively, the distance between the aforementioned CLK(B) terminal and the first body-side claw portion 29a may be defined as the arc-shaped distance between the intermediate position of the first body-side claw portion 29a in the circumferential direction of the body-side mount 21 and the CLK(B) terminal. The distances between other body-side terminals, such as the HCLK(B) terminal, VBAT(B) terminal, and LDET(B) terminal, and the first body-side claw portion 29a are also arc-shaped distances. The distance between the first leaf spring 41a (the fourth leaf spring 41d) and the body-side terminal is also an arc-shaped distance.

[0094] The above has described the camera body 2, but the same applies to the interchangeable lens 3. In the present embodiment, the CLK(L) terminal and the HCLK(L) terminal are arranged immediately beside the first lens-side claw portion 39a. That is, the CLK(L) terminal and the HCLK(L) terminal are arranged closer to the first lens-side claw portion 39a than the VBAT(L) terminal and the LDET(L) terminal. In other words, the distance between the CLK(L) terminal and the first lens-side claw portion 39a is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first lens-side claw portion 39a, and the distance between the HCLK(L) terminal and the first lens-side claw portion 39a is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first lens-side claw portion 39a. The first lens-side claw portion 39a is pressed in the +Z direction (FIG. 1) by the first leaf spring 41a on the body side. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the first lens-side claw portion 39a are pressed more strongly against the body-side terminals than the VBAT(L) terminal or the LDET(L) terminal by the first leaf spring 41a.

[0095] In the present embodiment, as shown in FIG. 5(a), the CLK(B) terminal and the HCLK(B) terminal are arranged inside a fan-shaped region (range of an angle of 50°) formed by the center position of the opening of the mount 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped first body-side claw portion 29a. Alternatively, the CLK(B) terminal and the HCLK(B) terminal are arranged inside a triangular region formed by the center position of the opening of the mount 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and both ends on the inner peripheral side of the first body-side claw portion 29a. Therefore, there is no first body-side claw portion 29a on the extension line of the dashed-dotted line 51 connecting the center position of the opening of the mount 21 and the LDET(B) terminal, but there is a first body-side claw portion 29a on the extension line of the dashed-dotted line 52 connecting the center position of the opening of the mount 21 and the HCLK(B) terminal, and there is a first body-side claw portion 29a on the extension line of the dashed-dotted line 53 connecting the center position of the opening of the mount 21 and the CLK(B) terminal. Thereby, in the state where the mounting is completed, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly against the corresponding lens-side terminals than the LDET(B) terminal.

[0096] As shown in FIG. 6, the CLK(L) terminal and the HCLK(L) terminal are arranged inside a sector (in the range of an angle of 60°) formed by the center position of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped first lens-side claw portion 39a. Alternatively, the CLK(L) terminal and the HCLK(L) terminal are arranged inside a triangular region formed by the center position of the opening of the mount 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and both ends on the outer peripheral side of the first lens-side claw portion 39a. Therefore, there is no first lens-side claw portion 39a on the extension line of the dashed-dotted line 61 connecting the center position of the opening of the mount 31 and the LDET(L) terminal, but there is a first lens-side claw portion 39a on the extension line of the dashed-dotted line 62 connecting the center position of the opening of the mount 31 and the HCLK(L) terminal, and there is a first lens-side claw portion 39a on the extension line of the dashed-dotted line 63 connecting the center position of the opening of the mount 31 and the CLK(L) terminal. As a result, in the state where the mounting is completed, the CLK(L) terminal and the HCLK(L) terminal come into contact with the corresponding body-side terminals more stably than the LDET(L) terminal. In other words, a stronger force that presses the CLK(L) terminal and the HCLK(L) terminal against the body-side terminals acts than on the LDET(L) terminal. Therefore, even when the tips of the CLK(B) terminal and the HCLK(B) terminal are worn, the communication of the clock signal between the camera body 2 and the interchangeable lens 3 is stably performed.

[0097] In the present embodiment, the CLK(B) terminal, CLK(L) terminal, HCLK(B) terminal, and HCLK(L) terminal have been described. The same applies to the other communication system terminals, namely, the HDATA(B) terminal, HDATA(L) terminal, DATAL(B) terminal, DATAL(L) terminal, DATAB(B) terminal, and DATAB(L) terminal. That is, the HDATA(B) terminal, DATAL(B) terminal, and DATAB(B) terminal are arranged closer (shorter distance) to the body-side first claw portion 29a and the first leaf spring 41a than the LDET(B) terminal and VBAT(B) terminal. By doing so, the HDATA(B) terminal, DATAL(B) terminal, and DATAB(B) terminal are pressed more strongly against the lens-side terminal than the VBAT(B) terminal and LDET(B) terminal, and can maintain good contact with the lens-side terminal. Also, the HDATA(L) terminal, DATAL(L) terminal, and DATAB(L) terminal are arranged closer (shorter distance) to the lens-side first claw portion 39a than the LDET(L) terminal and VBAT(L) terminal. By doing so, the HDATA(L) terminal, DATAL(L) terminal, and DATAB(L) terminal are pressed more strongly against the body-side terminal than the VBAT(L) terminal and LDET(L) terminal, and can maintain good contact with the lens-side terminal.

[0098] (Second Embodiment) Next, the interchangeable lens 3A of the camera system 1 according to the second embodiment will be described. FIG. 7 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3A according to the second embodiment. As shown in FIG. 7, the lens-side terminal holder 32A included in the interchangeable lens 3A according to the second embodiment has an LDET(L) terminal, a VBAT(L) terminal, a PGND(L) terminal, a V33(L) terminal, a GND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32A included in the interchangeable lens 3A according to the second embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0099] The interchangeable lens 3A according to the second embodiment is configured to synchronize data transmission and reception by command data communication in the same manner as, for example, a so-called step-synchronous communication method. At the start of command data communication, the signal sequence received by the lens-side communication unit 34A from the body-side communication unit 24 via the DATAB(B) terminal and the DATAB(L) terminal is constant. Therefore, the lens-side control unit 33A can identify the signal sequence received from the body-side communication unit 24 at the start of command data communication and obtain the cycle timing and clock frequency necessary for synchronizing data transmission and reception by command data communication.

[0100] Similar to the operation of the interchangeable lens 3 according to the first embodiment described with reference to FIG. 3, the lens-side control unit 33A of the interchangeable lens 3A according to the second embodiment uses the cycle timing and clock frequency obtained by the method as described above to receive a body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and to transmit a lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal. Note that the interchangeable lens 3A according to the second embodiment may include an ASIC (application specific integrated circuit) having a dedicated circuit for obtaining the cycle timing and clock frequency necessary for synchronization of data transmission and reception by command data communication.

[0101] Also, the lens-side terminal holding unit 32A of the interchangeable lens 3A according to the second embodiment has a configuration in which each terminal other than the CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32A of the interchangeable lens 3A has a configuration in which terminals of LDET(L), VBAT(L), PGND(L), V33(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0102] (Third Embodiment) Next, the interchangeable lens 3B of the camera system 1 according to the third embodiment will be described. FIG. 8 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3B according to the third embodiment. As shown in FIG. 8, the lens-side terminal holder 32B provided in the interchangeable lens 3B according to the third embodiment has an LDET(L) terminal, a VBAT(L) terminal, a PGND(L) terminal, a V33(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32B provided in the interchangeable lens 3B according to the third embodiment does not include the GND(L) terminal of the interchangeable lens 3 according to the first embodiment. Further, the lens-side terminal holder 32B provided in the interchangeable lens 3B according to the third embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0103] Therefore, in the interchangeable lens 3B according to the third embodiment, the PGND(L) terminal is used as the ground potential (ground) of the power supply voltage of the drive system and is connected to each part such as the lens-side control unit 33B and is used as the ground potential (ground) 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.

[0104] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33B of the interchangeable lens 3B according to the third embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0105] In addition, the lens-side terminal holding portion 32B of the interchangeable lens 3B according to the third embodiment has a configuration in which each terminal other than the GND(L) terminal and the CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding portion 32B of the interchangeable lens 3B has a configuration in which terminals such as LDET(L), VBAT(L), PGND(L), V33(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0106] (Fourth Embodiment) Next, the interchangeable lens 3C of the camera system 1 according to the fourth embodiment will be described. FIG. 9 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3C according to the fourth embodiment. As shown in FIG. 9, the lens-side terminal holding portion 32C included in the interchangeable lens 3C according to the fourth embodiment 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 DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holding portion 32C included in the interchangeable lens 3C according to the fourth embodiment does not include the PGND(L) terminal of the interchangeable lens 3 according to the first embodiment. Further, the lens-side terminal holding portion 32C included in the interchangeable lens 3C according to the fourth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0107] Therefore, in the interchangeable lens 3C according to the fourth embodiment, the GND(L) terminal is used as the ground potential (ground) of the power supply voltage of the circuit system and is connected to each part such as the drive unit 37, and is also used as the ground potential (ground) 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 V33(L) terminal and the GND(L) terminal.

[0108] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33C of the interchangeable lens 3C according to the fourth embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0109] Also, the lens-side terminal holding unit 32C of the interchangeable lens 3C according to the fourth embodiment has a configuration in which each terminal other than the PGND(L) terminal and the CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32C of the interchangeable lens 3C has a configuration in which terminals of LDET(L), VBAT(L), V33(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0110] (Fifth Embodiment) Next, the interchangeable lens 3D of the camera system 1 according to the fifth embodiment will be described. FIG. 10 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3D according to the fifth embodiment. As shown in FIG. 10, the lens-side terminal holder 32D provided in the interchangeable lens 3D according to the fifth embodiment has an LDET(L) terminal, a VBAT(L) terminal, a PGND(L) terminal, a GND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32D provided in the interchangeable lens 3D according to the fifth embodiment does not include the V33(L) terminal of the interchangeable lens 3 according to the first embodiment, and the power supply for supplying the lens-side control unit 33D and the like is not supplied from the camera body 2. Further, the lens-side terminal holder 32D provided in the interchangeable lens 3D according to the fifth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0111] Therefore, the interchangeable lens 3D according to the fifth embodiment includes a DC / DC converter 50. The DC / DC converter 50 is, for example, a step-down type voltage conversion circuit and is connected to the VBAT(L) terminal and the lens-side control unit 33D. The DC / DC converter 50 voltage-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 33D and the like. A bypass capacitor C2 is connected between the wiring for supplying power from the DC / DC converter 50 to the lens-side control unit 33D and the like and the GND(L) terminal.

[0112] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 3D of the interchangeable lens 3D according to the fifth embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained cycle timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0113] In addition, the lens-side terminal holding unit 32D of the interchangeable lens 3D according to the fifth embodiment has a configuration in which each terminal other than the V33(L) terminal and the CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32D of the interchangeable lens 3D has a configuration in which terminals such as LDET(L), VBAT(L), PGND(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0114] (Sixth Embodiment) Next, the interchangeable lens 3E of the camera system 1 according to the sixth embodiment will be described. FIG. 11 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3E according to the sixth embodiment. As shown in FIG. 11, the lens-side terminal holder 32E provided in the interchangeable lens 3E according to the sixth embodiment has an LDET(L) terminal, a PGND(L) terminal, a V33(L) terminal, a GND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32E provided in the interchangeable lens 3E according to the sixth embodiment does not include the VBAT(L) terminal of the interchangeable lens 3 according to the first embodiment, and the driving system power for supplying the driving unit 37 and the like is not supplied from the camera body 2. Also, the lens-side terminal holder 32E provided in the interchangeable lens 3E according to the sixth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0115] Therefore, the interchangeable lens 3E according to the sixth embodiment includes a DC / DC converter 51. The DC / DC converter 51 is, for example, a step-up type voltage conversion circuit and is connected to the V33(L) terminal and the driving unit 37. The DC / DC converter 51 voltage-converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the driving system circuits such as the driving unit 37. A bypass capacitor C1 is connected between the wiring for power supply from the DC / DC converter 51 to the driving unit 37 and the PGND(L) terminal.

[0116] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33E of the interchangeable lens 3E according to the sixth embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0117] In addition, the lens-side terminal holding unit 32E of the interchangeable lens 3E according to the sixth embodiment has a configuration in which each terminal other than the VBAT(L) terminal and the CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32D of the interchangeable lens 3D has a configuration in which terminals such as LDET(L), PGND(L), V33(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0118] (Seventh Embodiment) Next, the interchangeable lens 3F of the camera system 1 according to the seventh embodiment will be described. Regarding the configuration common to the above-described first embodiment, the description thereof will be omitted. FIG. 12 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3F according to the seventh embodiment. As shown in FIG. 12, the lens-side terminal holder 32F provided in the interchangeable lens 3F according to the seventh embodiment has an LDET(L) terminal, a VBAT(L) terminal, a PGND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32F provided in the interchangeable lens 3F according to the seventh embodiment does not include the V33(L) terminal and the GND(L) terminal of the interchangeable lens 3 according to the first embodiment, and the power for supplying the lens-side control unit 33F and the like is not supplied from the camera body 2. Further, the lens-side terminal holder 32F provided in the interchangeable lens 3F according to the seventh embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0119] Therefore, the interchangeable lens 3F according to the seventh embodiment includes a DC / DC converter 52. The DC / DC converter 52 is, for example, a step-down voltage conversion circuit and is connected to the VBAT(L) terminal and the lens-side control unit 33F. The DC / DC converter 52 voltage-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 33F and the like.

[0120] Also, in the interchangeable lens 3F according to the seventh embodiment, the PGND(L) terminal is used as the ground potential (ground) of the power supply voltage of the drive system and is connected to each part such as the lens-side control unit 33F and is used as the ground potential (ground) of the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the wiring for power supply from the DC / DC converter 52 to the lens-side control unit 33F and the like and the PGND(L) terminal.

[0121] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33F of the interchangeable lens 3F according to the seventh embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0122] Also, the lens-side terminal holding unit 32F of the interchangeable lens 3F according to the seventh embodiment has a configuration in which each terminal other than the V33(L) terminal, GND(L) terminal, and CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32F of the interchangeable lens 3F has a configuration in which terminals of LDET(L), VBAT(L), PGND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0123] (Eighth Embodiment) Next, the interchangeable lens 3G of the camera system 1 according to the eighth embodiment will be described. Regarding the configuration common to the above-described first embodiment, the description thereof will be omitted. FIG. 12 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3G according to the eighth embodiment. As shown in FIG. 12, the lens-side terminal holder 32G provided in the interchangeable lens 3G according to the eighth embodiment has an LDET(L) terminal, a VBAT(L) terminal, a GND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32G provided in the interchangeable lens 3G according to the seventh embodiment does not include the PGND(L) terminal and the V33(L) terminal of the interchangeable lens 3 according to the first embodiment, and power for supplying to the lens-side control unit 33G and the like is not supplied from the camera body 2. Further, the lens-side terminal holder 32G provided in the interchangeable lens 3G according to the eighth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and a clock signal used for command data communication is not input from the camera body 2.

[0124] Therefore, the interchangeable lens 3G according to the eighth embodiment includes a DC / DC converter 53. The DC / DC converter 53 is, for example, a step-down voltage conversion circuit and is connected to the VBAT(L) terminal and the lens-side control unit 33G. The DC / DC converter 53 voltage-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 33G and the like.

[0125] In addition, in the interchangeable lens 3G according to the eighth embodiment, the GND(L) terminal is used as the ground potential (ground) of the power supply voltage of the circuit system and is connected to each part such as the drive unit 37, and is also used as the ground potential (ground) 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 for supplying power from the DC / DC converter 53 to the lens-side control unit 33G etc. and the GND(L) terminal.

[0126] In addition, the lens control unit 33G of the interchangeable lens 3G according to the eighth embodiment, similar to the interchangeable lens 3A according to the second embodiment described above, identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0127] In addition, the lens-side terminal holding unit 32G of the interchangeable lens 3G according to the eighth embodiment has a configuration in which terminals other than the PGND(L) terminal, V33(L) terminal, and CLK(L) terminal in the example shown in FIG. 6 are arranged. That is, the lens-side terminal holding unit 32G of the interchangeable lens 3G has a configuration in which terminals of LDET(L), VBAT(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0128] (Ninth Embodiment) Next, the interchangeable lens 3H of the camera system 1 according to the ninth embodiment will be described. Regarding the configurations common to the above-described first embodiment, the description thereof will be omitted. FIG. 14 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3H according to the ninth embodiment. As shown in FIG. 14, the lens-side terminal holder 32H included in the interchangeable lens 3H according to the ninth embodiment has an LDET(L) terminal, a PGND(L) terminal, a V33(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32H included in the interchangeable lens 3H according to the ninth embodiment does not include the VBAT(L) terminal and the GND(L) terminal of the interchangeable lens 3 according to the first embodiment, and the driving system power for supplying the driving unit 37 and the like is not supplied from the camera body 2. Further, the lens-side terminal holder 32H included in the interchangeable lens 3H according to the ninth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0129] Therefore, the interchangeable lens 3H according to the ninth embodiment includes a DC / DC converter 54. The DC / DC converter 54 is, for example, a step-up type voltage conversion circuit and is connected to the V33(L) terminal and the driving unit 37. The DC / DC converter 54 voltage-converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the driving system circuits such as the driving unit 37.

[0130] Also, in the interchangeable lens 3H according to the ninth embodiment, the PGND(L) terminal is used as the ground potential (ground) of the driving system power supply voltage and is connected to each part such as the lens-side control unit 33H and is used as the ground potential (ground) of the circuit system power supply voltage. A bypass capacitor C1 is connected between the wiring for power supply from the DC / DC converter 54 to the driving unit 37 and the like and the PGND(L) terminal.

[0131] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33H of the interchangeable lens 3H according to the ninth embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, and uses the obtained periodic timing and clock frequency to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal, and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0132] Also, the lens-side terminal holding unit 32H of the interchangeable lens 3H according to the ninth embodiment has a configuration in which each terminal other than the VBAT(L) terminal, GND(L) terminal, and CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32H of the interchangeable lens 3H has a configuration in which terminals of LDET(L), PGND(L), V33(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0133] (Tenth Embodiment) Next, the interchangeable lens 3I of the camera system 1 according to the tenth embodiment will be described. Regarding the configurations common to the above-described first embodiment, the description thereof will be omitted. FIG. 15 is a circuit diagram schematically showing the electrical connection between the camera body 2 and the interchangeable lens 3I according to the tenth embodiment. As shown in FIG. 15, the lens-side terminal holder 32I included in the interchangeable lens 3I according to the tenth embodiment has an LDET(L) terminal, a V33(L) terminal, a GND(L) terminal, a RDY(L) terminal, a DATAB(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal, similar to the interchangeable lens 3 according to the first embodiment. Since the functions and roles of these terminals are the same as those of the interchangeable lens 3 according to the first embodiment, the description thereof will be omitted. The lens-side terminal holder 32I included in the interchangeable lens 3I according to the tenth embodiment does not include the VBAT(L) terminal and the PGND(L) terminal of the interchangeable lens 3 according to the first embodiment, and the driving system power for supplying the driving unit 37 and the like is not supplied from the camera body 2. Further, the lens-side terminal holder 32I included in the interchangeable lens 3I according to the tenth embodiment does not include the CLK(L) terminal of the interchangeable lens 3 according to the first embodiment, and the clock signal used for command data communication is not input from the camera body 2.

[0134] Therefore, the interchangeable lens 3I according to the tenth embodiment includes a DC / DC converter 55. The DC / DC converter 55 is, for example, a step-up type voltage conversion circuit and is connected to the V33(L) terminal and the driving unit 37. The DC / DC converter 55 voltage-converts the power supply voltage supplied from the camera body 2 via the V33(L) terminal and supplies power to the driving system circuits such as the driving unit 37.

[0135] Also, in the interchangeable lens 3I according to the tenth embodiment, the GND(L) terminal is used as the ground potential (ground) of the power supply voltage of the circuit system and is connected to each part such as the driving unit 37 and is also used as the ground potential (ground) of the power supply voltage of the driving system. A bypass capacitor C1 is connected between the wiring for supplying power from the DC / DC converter 55 to the driving unit 37 and the GND(L) terminal.

[0136] Also, similar to the interchangeable lens 3A according to the second embodiment described above, the lens control unit 33I of the interchangeable lens 3I according to the tenth embodiment identifies the signal sequence received from the body-side communication unit 24 at the start of command data communication, obtains the periodic timing and clock frequency, and uses them to receive the body-side command signal from the body-side communication unit 34 via the DATAB(L) terminal and transmit the lens-side data signal to the body-side communication unit 34 via the DATAL(L) terminal.

[0137] Also, the lens-side terminal holding unit 32I of the interchangeable lens 3I according to the tenth embodiment has a configuration in which each terminal other than the VBAT(L) terminal, PGND(L) terminal, and CLK(L) terminal in the example shown in FIG. 6 is arranged. That is, the lens-side terminal holding unit 32H of the interchangeable lens 3H has a configuration in which terminals such as LDET(L), V33(L), GND(L), RDY(L), DATAB(L), DATAL(L), HCLK(L), and HDATA(L) are arranged.

[0138] Also in the second to tenth embodiments, similar to the first embodiment, the following effects are obtained to suppress the influence of various noises. The RDY terminal is arranged away from both the VBAT terminal and the HCLK terminal, which are noise sources, so as not to be adjacent to either of them. Thereby, the influence of noise on the RDY terminal, which is used to indicate the availability of command communication, can be suppressed. Also, the HCLK terminal, which is 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, and DATAB terminal are arranged in order from the rear end in the mounting direction. Thereby, the influence of noise caused by the clock signal on the RDY terminal and the like can be suppressed. Furthermore, considering the influence of noise, the power supply terminal group and the terminal group used for communication are arranged separately with the RDY terminal in between. Specifically, with the RDY terminal in between, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal, which are power supply terminals, are arranged in order from the tip side in the mounting direction, and the DATAB terminal, DATAL terminal, HCLK terminal, and HDATA terminal, which are terminals used for communication, are arranged in order from the tip side on the rear end side in the mounting direction. Thereby, the influence of the power supply system terminal group such as the VBAT terminal on the terminals used for communication can be suppressed. Also, the influence of noise on the RDY terminal of the power supply system terminal group such as the VBAT terminal and the terminal group used for communication such as the HCLK terminal can be suppressed.

[0139] Between the HCLK terminal and the GND terminal, the HCLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. Thereby, the noise caused by the VBAT terminal to the HCLK terminal to which the clock signal (H clock signal) used for hot line communication is sent can be shielded.

[0140] The following modifications are also possible, and one or a plurality of modification examples can also be combined with the above-described embodiments. (Modification Example 1) Any of the terminals used for command data communication or hot line communication may also be provided with a function of transmitting a power-on signal from the interchangeable lens 3 to the camera body 2. For example, the interchangeable lens 3 is provided with a power switch function. Even when the interchangeable lens 3 is in the mounted state and the camera system 1 is in the power-off state, the power supply unit 26 supplies power from the V33(B) terminal to the lens-side control unit 33 of the interchangeable lens 3. When the power switch of the interchangeable lens 3 is operated, the lens-side control unit 33 outputs a power-on signal to the RDY(L) terminal, for example, via the lens-side communication unit 34. When the body-side control unit 23 detects the power-on signal via the RDY(B) terminal via the body-side communication unit 24, the camera system 1 is transitioned from the power-off state to the power-on state in the same manner as when a power switch (not shown) provided in the camera body 2 is operated.

[0141] (Modification 2) In the embodiment, the DATAB(B) terminal is arranged on the front-end side in the mounting direction of the CLK(B) terminal, 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 may be interchanged. That is, the DATAL(B) terminal, the CLK(B) terminal, and the DATAB(B) terminal may be arranged in this order from the front-end side in the mounting direction.

[0142] Also, regarding each terminal of the lens-side terminal group described in each of the above-described embodiments, the LDET(L) terminal may be referred to as a detection terminal. Also, the VBAT(L) terminal may be referred to as a power supply terminal or a first power supply terminal. Also, the PGND(L) terminal may be referred to as a ground terminal or a first ground terminal. Also, the V33(L) terminal may be referred to as a power supply terminal or a second power supply terminal. Also, the GND(L) terminal may be referred to as a ground terminal or a second ground terminal. Also, the RDY(L) terminal may be referred to as a ready terminal. Also, the DATAB(L) terminal may be referred to as a data terminal or a first data terminal. Also, the CLK(L) terminal may be referred to as a clock terminal or a first clock terminal. Also, the DATAL(L) terminal may be referred to as a data terminal or a second data terminal. Also, the HCLK(L) terminal may be referred to as a clock terminal or a second clock terminal. Also, the HDATA(L) terminal may be referred to as a data terminal or a third data terminal.

[0143] In the above-described embodiment, an interchangeable lens of a camera is taken as an example of the accessory, but the accessory is not limited to the interchangeable lens. For example, a teleconverter, a wide converter, a close-up ring, etc. that are mounted between the camera body and the interchangeable lens and change the focal length of the interchangeable lens may be used. Alternatively, it can also be applied to a mount adapter that enables mounting of an accessory including an interchangeable lens with another mount standard to the mount standard of the above-described camera body. That is, any accessory that is mounted on the mount of the camera body can be similarly applied. In that case, the lens-side terminal group, the lens-side claw portion 39, the lens-side communication portion 34, etc. correspond to the accessory-side terminal group, the accessory-side protruding portion, the accessory-side communication portion, etc. of each accessory. In the above-described embodiment, the accessory is detachable from the camera body, but the above-described camera body may be a mount adapter that enables mounting of an interchangeable lens with the above-described mount standard to a camera body different from the above-described mount standard, and it may be configured to enable mounting of the above-described accessory to the mount adapter.

Explanation of Signs

[0144] 1... Camera system, 2... Camera body, 3, 3A, 3B, 3C, 3D, 3E, 3F, 3G, 3H, 3I... Interchangeable lens, 21... Body-side mount, 22... Body-side terminal holding portion, 31... Lens-side mount, 32, 32A, 32B, 32C, 32D, 32E, 32F, 32G, 32H, 32I... Lens-side terminal holding portion

Claims

[Claim 1] An accessory that can be attached to a camera body, a communication unit including a circuit for communicating with the camera body; a ready terminal used to indicate whether communication with the camera body via the communication unit is possible; a first data terminal to which a first data signal is input from the camera body to the communication unit; a second data terminal that outputs a second data signal from the communication unit to the camera body; a first clock terminal that outputs a clock signal from the communication unit to the camera body; a third data terminal that outputs a third data signal from the communication unit to the camera body in synchronization with the clock signal, An accessory in which the ready terminal, the first data terminal, the second data terminal, the first clock terminal, and the third data terminal are arranged in sequence.

Images