Fitting

Abstract

Provided is an accessory that can be attached to and detached from a camera body, the accessory being provided with: a first terminal that causes the camera body to detect attachment of the accessory; a second terminal to which the first power supply voltage is supplied; a third terminal serving as a ground potential of the first power supply voltage; a fourth terminal to which a second power supply voltage is supplied; a fifth terminal serving as a ground potential of the second power supply voltage; a sixth terminal indicating whether communication with the camera body is possible; an eighth terminal to which a first clock signal of a first cycle is input; a seventh terminal to which a first data signal synchronized with the first clock signal is input; a ninth terminal outputting a third data signal in synchronization with the first clock signal; a tenth terminal that outputs a second clock signal of a second period that is longer than the first period; and an eleventh terminal outputting a second data signal in synchronization with the second clock signal, a third terminal, a fourth terminal, and a fifth terminal being disposed between the second terminal and the sixth terminal, and a seventh terminal, an eighth terminal, and a ninth terminal being disposed between the sixth terminal and the tenth terminal.

Description

[0001] This application is a divisional application of the application with application number 201811248317.1, application date October 25, 2018, and invention name “Accessories”. Technical Field

[0002] The present invention relates to accessories. Background Art

[0003] There are known accessories that can be attached to and detached from a camera body (for example, Patent Document 1). Conventionally, it has been necessary to properly attach the accessories to the camera body in a usable state.

[0004] [Prior art literature]

[0005] [Patent Literature]

[0006] [Patent Document 1]

[0007] Japanese Patent Application Laid-Open No. 2004-117380 Summary of the invention

[0008] A first technical solution of the present invention relates to an accessory that can be mounted and removed from a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal for enabling the camera body to detect the attachment of the accessory; a second terminal to which a first power supply voltage is supplied from the camera body; a third terminal used as a ground potential for the first power supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal used as a ground potential for the second power supply voltage; a sixth terminal used to indicate whether communication with the camera body is possible; an eighth terminal to which a first clock signal of a first period is input from the camera body; and a seventh terminal to which a first clock signal of a first period is input from the camera body. A first data signal synchronized with the first clock signal is input to the camera body; a ninth terminal is configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal is configured to output a second clock signal having a second period longer than the first period to the camera body; and an eleventh terminal is configured to output a second data signal to the camera body in synchronization with the second clock signal, three terminals, namely the third terminal, the fourth terminal and the fifth terminal, are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0009] A second technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal for enabling the camera body to detect the attachment of the accessory; a second terminal to which a first power supply voltage is supplied from the camera body; a third terminal used as a ground potential for the first power supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal used as a ground potential for the second power supply voltage; a sixth terminal used to indicate whether communication with the camera body is possible; an eighth terminal to which a first clock signal of a first period is input from the camera body; and a seventh terminal to which a first clock signal of a first period is input from the camera body. inputting a first data signal synchronized with the first clock signal; a ninth terminal which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal which outputs a second clock signal having a second period longer than the first period to the camera body; and an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, wherein the second terminal, the third terminal, the fourth terminal, and the fifth terminal which are terminals of a driving system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal which are terminals of a communication system are arranged so as to sandwich the sixth terminal.

[0010] The third technical solution of the present invention relates to an accessory. On the basis of the second technical solution, three terminals, namely the third terminal, the fourth terminal and the fifth terminal, are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0011] A fourth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the accessory comprises: an optical system including a driven component; and a driving unit that drives the driven component, and the driving unit is driven by the first power supply voltage.

[0012] The fifth technical solution of the present invention relates to an accessory, based on the fourth technical solution, wherein the driven component includes: any one of a component capable of moving along the optical axis direction of the optical system, a component capable of moving in a manner including a component in a direction perpendicular to the optical axis direction, and a component capable of moving in a manner changing the size of an opening through which a light beam passes.

[0013] The sixth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the second power supply voltage supplied via the fourth terminal is used to perform the following actions: using the seventh terminal to input the first data signal synchronized with the first clock signal, using the ninth terminal to output the third data signal to the camera body in synchronization with the first clock signal, and using the eleventh terminal to output the second data signal to the camera body in synchronization with the second clock signal.

[0014] A seventh technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the second power supply voltage is lower than the first power supply voltage.

[0015] An eighth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the sixth terminal outputs: a signal indicating whether the communication based on the first data signal and the third data signal can be performed.

[0016] A ninth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the first terminal is arranged next to the second terminal, and the eleventh terminal is arranged next to the tenth terminal.

[0017] A tenth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the third terminal is arranged next to the second terminal, and the first terminal is arranged next to the second terminal on the opposite side to the third terminal.

[0018] An eleventh technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the fifth terminal is arranged next to the fourth terminal.

[0019] The twelfth technical scheme of the present invention relates to an accessory. Based on any one of the first to ninth technical schemes, the third terminal is arranged next to the second terminal, and the fourth terminal is arranged next to the fifth terminal, in the order of the second terminal, the third terminal, the fourth terminal, and the fifth terminal.

[0020] The thirteenth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the ninth terminal is arranged next to the tenth terminal, and the eleventh terminal is arranged next to the side opposite to the ninth terminal relative to the tenth terminal.

[0021] A fourteenth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the seventh terminal is arranged next to the eighth terminal, and the ninth terminal is arranged next to the eighth terminal on the opposite side to the seventh terminal.

[0022] A fifteenth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the fifth terminal is arranged next to the sixth terminal, and the seventh terminal is arranged next to the sixth terminal on the side opposite to the fifth terminal.

[0023] A sixteenth technical solution of the present invention relates to an accessory, which, based on any of the above technical solutions, inputs the first data signal via the seventh terminal at a timing different from the first cycle of the first clock signal.

[0024] A seventeenth technical solution of the present invention relates to an accessory, which, based on any one of the first to fifteenth technical solutions, outputs the third data signal via the ninth terminal at a timing different from the first cycle of the first clock signal.

[0025] The eighteenth technical solution of the present invention relates to an accessory, which, based on any one of the first to fifteenth technical solutions, periodically outputs the second data signal via the eleventh terminal at a timing different from the second period of the second clock signal.

[0026] A nineteenth technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, a period for outputting the second data signal is shorter than a period for inputting the first data signal and outputting the third data signal.

[0027] The twentieth technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a first power supply voltage from the camera body; a fourth terminal, which is supplied with a second power supply voltage from the camera body; a fifth terminal, which is used as a ground potential for the first power supply voltage and the second power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body can be performed; an eighth terminal, which is input with a first clock signal of a first period from the camera body; and a seventh terminal, which is input with a first clock signal from the camera body. A first data signal synchronized with the first clock signal is input to the camera body; a ninth terminal is used to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal is used to output a second clock signal having a second period longer than the first period to the camera body; and an eleventh terminal is used to output a second data signal to the camera body in synchronization with the second clock signal, two terminals, a fourth terminal and a fifth terminal are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0028] The twenty-first technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has multiple terminals, the accessory comprising: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a power supply voltage from the camera body; a third terminal, which is used as a ground potential of the power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body can be carried out; an eighth terminal, which is input with a first clock signal of a first period from the camera body; a seventh terminal, which is input with a first data signal synchronized with the first clock signal from the camera body; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period longer than the first period to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, the third terminal is arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0029] The twenty-second technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a first power supply voltage from the camera body; a fourth terminal, which is supplied with a second power supply voltage from the camera body; a fifth terminal, which is used as a ground potential for the first power supply voltage and the second power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body can be performed; an eighth terminal, which is input with a first clock signal of a first period from the camera body; and a seventh terminal, which is input with a first clock signal from the camera body. A first data signal synchronized with the first clock signal; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period longer than the first period to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, wherein the second terminal, the fourth terminal, and the fifth terminal as terminals of a drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of a communication system are arranged so as to sandwich the sixth terminal.

[0030] The twenty-third technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, the accessory comprising: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a power supply voltage from the camera body; a third terminal, which is used as a ground potential of the power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body can be performed; an eighth terminal, which is input with a first clock signal of a first period from the camera body; a seventh terminal, which is input with a first data signal synchronized with the first clock signal from the camera body; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period longer than the first period to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, the second terminal and the third terminal as terminals of a drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of a communication system are arranged to sandwich the sixth terminal.

[0031] The twenty-fourth technical solution of the present invention relates to an accessory, which, based on any one of the twentieth to twenty-third technical solutions, inputs the first data signal via the seventh terminal at a timing different from the first cycle of the first clock signal.

[0032] The twenty-fifth technical solution of the present invention relates to an accessory, which, based on any one of the twentieth to twenty-third technical solutions, outputs the third data signal via the ninth terminal at a timing different from the first cycle of the first clock signal.

[0033] The twenty-sixth technical solution of the present invention relates to an accessory, which, based on any one of the twentieth to twenty-third technical solutions, periodically outputs the second data signal via the eleventh terminal at a timing different from the second period of the second clock signal.

[0034] The twenty-seventh technical solution of the present invention relates to an accessory, based on any one of the twentieth to twenty-third technical solutions, wherein a period of outputting the second data signal is shorter than a period of inputting the first data signal and outputting the third data signal.

[0035] A twenty-eighth technical solution of the present invention relates to an accessory, wherein, based on any one of the twentieth to twenty-third technical solutions, the sixth terminal outputs a signal indicating whether the communication based on the first data signal and the third data signal can be performed.

[0036] The twenty-ninth technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a first power supply voltage from the camera body; a third terminal, which is used as a ground potential of the first power supply voltage; a fourth terminal, which is supplied with a second power supply voltage from the camera body; a fifth terminal, which is used as a ground potential of the second power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body can be performed; an eighth terminal, which is input with a first clock signal of a first period from the camera body; and a seventh terminal, which A first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, three terminals, namely the third terminal, the fourth terminal and the fifth terminal, are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0037] The thirtieth technical solution of the present invention relates to an accessory that can be loaded and unloaded relative to a camera body and has a plurality of terminals, wherein the accessory comprises: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a first power supply voltage from the camera body; a third terminal, which is used as a ground potential for the first power supply voltage; a fourth terminal, which is supplied with a second power supply voltage from the camera body; a fifth terminal, which is used as a ground potential for the second power supply voltage; a sixth terminal, which is used to indicate whether communication with the camera body is possible; an eighth terminal, which is supplied with a first clock signal of a first period from the camera body; and a seventh terminal, which is supplied with a first clock signal from the camera body. The camera body inputs a first data signal synchronized with the first clock signal; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, and the second terminal, the third terminal, the fourth terminal, and the fifth terminal as terminals of a drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of a communication system are arranged to sandwich the sixth terminal.

[0038] A thirty-first technical solution of the present invention relates to an accessory. Based on any of the above technical solutions, the accessory is a replaceable lens that can be loaded and unloaded relative to the camera body. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A diagram schematically showing the configuration of a camera system.

[0040] Figure 2 is a circuit diagram schematically showing the electrical connection between the camera body and the interchangeable lens.

[0041] Figure 3 This is a timing chart showing an example of command data communication.

[0042] Figure 4 is a sequence diagram showing an example of hotline communication.

[0043] Figure 5 This is a front view schematically showing the mounting surface of the camera body viewed from the interchangeable lens side.

[0044] Figure 6 This is a front view schematically showing the mounting surface of the interchangeable lens as viewed from the camera body side.

[0045] Description of Reference Numerals

[0046] 1... Camera system, 2... Camera body, 3... Interchangeable lens, 21... Body side mounting part, 22... Body side terminal holding part, 31... Lens side mounting part, 32... Lens side terminal holding part DETAILED DESCRIPTION

[0047] (First Embodiment)

[0048] Figure 1 1 is a diagram schematically showing a configuration of a camera system 1 according to the first embodiment. The camera system 1 includes a camera body 2 and an interchangeable lens 3 as an example of an accessory that can be attached to and detached from the camera body 2 .

[0049] The interchangeable lens 3 includes a lens mount 31, a lens terminal holder 32, a lens control unit 33 including a lens communication unit 34, a lens storage unit 35, a photographing optical system 36, and a drive unit 37. The lens mount 31 and the lens terminal holder 32 will be described in detail later.

[0050] 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 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 unit 32. The lens side storage unit 35 is a non-volatile storage medium. The lens side storage unit 35 is connected to the lens side control unit 33. The predetermined control program executed by the lens side control unit 33 is pre-stored 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.

[0051] The photographing optical system 36 forms a subject image on an imaging surface of the imaging element 27 described later. The optical axis O of the photographing optical system 36 substantially coincides with the center positions of the lens side mount 31 and the body side mount 21 described later. Figure 1 The photographing optical system 36 generally includes a lens 36a, a focusing lens 36b, and a lens 36c. The focusing lens 36b is a lens for adjusting the imaging position of the subject image. The driving unit 37 is connected to the lens side control unit 33 and has an actuator, etc., which are not shown in the figure. The driving unit 37 drives the focusing lens 36b along the optical axis direction (+Z direction, -Z direction) by using the actuator, etc.

[0052] The camera body 2 has a body-side mounting 21, a body-side terminal holding portion 22, a body-side control portion 23 having a body-side communication portion 24, a body-side storage portion 25, a power supply portion 26, an imaging element 27, and a switch 28 for detecting the state of a lock pin described later.

[0053] The body-side control unit 23 is composed of a microcomputer and its peripheral circuits. In addition, the body-side control unit 23 performs various controls on the body, but in the present invention, only the part related to communication is recorded, and other functions are omitted. The body-side communication unit 24 performs data communication described later with the interchangeable lens 3. The body-side communication unit 24 is connected to the body-side terminal (described later) provided in the body-side terminal holding unit 22. In addition, as described later, a part of the terminals of the body-side terminal holding unit 22 is connected to the body-side control unit 23. The body-side storage unit 25 is a non-volatile storage medium. The body-side storage unit 25 is connected to the body-side control unit 23. The body-side storage unit 25 pre-stores a predetermined control program executed by the body-side control unit 23. The body-side control unit 23 controls the camera body 2 by reading the control program from the body-side storage unit 25 and executing the program.

[0054] The power supply unit 26 has a power source, and supplies power to the camera body 2 and the interchangeable lens 3. The power supply unit 26 is connected to a body-side terminal group (described later) provided in the body-side terminal holding unit 22 and the body-side control unit 23. The imaging element 27 is, for example, a solid-state imaging element such as a CCD or a CMOS. The imaging element 27 is connected to the body-side control unit 23, captures a subject, and outputs a capture signal. The processing of the output capture signal is omitted.

[0055] 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 portion 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, an HCLK (B) terminal, and an HDATA (B) terminal. The 11 body-side terminals are collectively referred to as a body-side terminal group.

[0056] The LDET (B) terminal is a terminal 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 source 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.

[0057] The VBAT (B) terminal, the PGND (B) terminal, the V33 (B) terminal, and the GND (B) terminal are terminals of a power supply system connected to the power supply unit 26. Figure 2In the figure, the direction of the supplied power is indicated by an arrow. The VBAT (B) terminal is a terminal for supplying power to the interchangeable lens 3. The drive unit 37 of the interchangeable lens 3 is driven by the power supplied via the VBAT (B) terminal. The operation of the drive unit 37 requires a voltage and a current greater than those of the lens-side control unit 33, and the maximum power supply voltage applied to the VBAT (B) terminal by the power supply unit 26 is about 10V. In the following description, the voltage applied to the VBAT (B) terminal by the power supply unit 26 is referred to as the drive system voltage. That is, the camera body 2 supplies the power supply voltage of the drive system to the interchangeable lens 3 from the VBAT (B) terminal. The PGND (B) terminal is a ground terminal corresponding to the VBAT (B) terminal, and is used as the ground potential (ground) of the power supply voltage of the drive system.

[0058] The V33(B) terminal is a terminal for supplying power to the interchangeable lens 3. 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. Each part of the lens side control unit 33 and the like operates at a voltage and a current smaller than that of the drive unit 37. The maximum voltage applied to the V33(B) terminal by the power supply unit 26 is about 3.3V. In the following description, the voltage applied to the V33(B) terminal by the power supply unit 26 is referred to as the circuit system voltage. That is, the camera body 2 supplies the power supply voltage of the circuit system to the interchangeable lens 3 from the V33(B) terminal. The GND(B) terminal is a ground terminal corresponding to the V33(B) terminal, and is used as a ground potential (grounding unit) of the power supply voltage of the circuit system.

[0059] 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 command data communication described later. In addition, the HCLK(B) terminal and HDATA(B) terminal are connected to the body side communication unit 24 and are used for hotline communication described later. Figure 2 In FIG. 1 , arrows are used to indicate the flow of signals. 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 for outputting a data signal to the interchangeable lens 3. The CLK (B) terminal is a terminal for outputting a clock signal (C clock signal) from the camera body 2 to the interchangeable lens 3.

[0060] The DATAL (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0061] 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.

[0062] The lens side terminal holding portion 32 includes an LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, a RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, an HCLK (L) terminal, and an HDATA (L) terminal. The above-mentioned 11 lens side terminals are collectively referred to as a lens side terminal group. When the interchangeable lens 3 is attached to the camera body 2, as in Figure 2 As shown by the dotted line in FIG. 1 , the body side terminal and the lens side terminal are electrically connected. Specifically, the LDET (B) terminal is connected to the LDET (L) terminal, the VBAT (B) terminal is connected to the VBAT (L) terminal, the PGND (B) terminal is connected to the PGND (L) terminal, the V33 (B) terminal is connected to the V33 (L) terminal, the GND (B) terminal is connected to the GND (L) terminal, the RDY (B) terminal is connected to the RDY (L) terminal, the DATAB (B) terminal is connected to the DATAB (L) terminal, the CLK (B) terminal is connected to the CLK (L) terminal, the DATAL (B) terminal is connected to the DATAL (L) terminal, the HCLK (B) terminal is connected to the HCLK (L) terminal, and the HDATA (B) terminal is connected to the HDATA (L) terminal. The signals input to or output from each lens side terminal correspond to the body side terminals that are in contact.

[0063] The LDET (L) terminal is a terminal for detecting the attachment or detachment of the interchangeable lens 3. The LDET (L) terminal is connected to the ground (GND) via the resistor R3. When the interchangeable lens 3 is attached to the camera body 2, the LDET (L) terminal is electrically connected to the LDET (B) terminal, and the LDET (B) terminal is pulled down. Thus, the camera body 2 can detect that the interchangeable lens 3 is attached.

[0064] The VBAT (L) terminal, PGND (L) terminal, V33 (L) terminal, and GND (L) terminal are terminals of the power supply system that are electrically connected to the VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, and GND (B) terminal, respectively. Figure 2, the direction of the supplied power is indicated by an arrow. The drive 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 a ground potential (grounding unit) 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.

[0065] The V33(L) terminal is a terminal for supplying power to the interchangeable lens 3. The V33(L) terminal and the GND(L) terminal are connected to various parts of the lens side control unit 33 and the like. 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 a ground potential (grounding part) of the power supply voltage of the circuit system. A bypass capacitor C2 is connected between the V33(L) terminal and the GND(L) terminal.

[0066] 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 terminals of a communication system 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 command data communication described later. In addition, the HCLK(L) terminal and the HDATA(L) terminal are used for hotline communication described later.

[0067] 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 various parts of 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 connected to the lens-side communication unit 34, respectively.

[0068] (Description of command data communication)

[0069] The transmission of control instructions (commands) and control contents (control data) from the body-side control unit 23 to the lens-side control unit 33 of the interchangeable lens 3 and the transmission of response contents (response data) and / or other data from the lens-side control unit 33 to the body-side control unit 23 is referred to as command data communication. Command data communication is full-duplex communication. Command data communication is performed by digital data communication using the RDY (B) terminal, RDY (L) terminal, DATAB (B) terminal, DATAB (L) terminal, CLK (B) terminal, CLK (L) terminal, DATAL (B) terminal, and DATAL (L) terminal via the body-side communication unit 24 and the lens-side communication unit 34.

[0070] The body-side control unit 23 transmits various control commands and control contents to the interchangeable lens 3 and receives response contents and / or other data from the interchangeable lens 3 through the body-side communication unit 24 and the lens-side communication unit 34 by command and data communication, thereby transmitting and receiving various information with the interchangeable lens 3. The control command referred to here is, for example, a command to transmit lens information. The various information received from the interchangeable lens 3 is, for example, model information of the interchangeable lens 3, information indicating optical characteristics such as the focal length of the photographing optical system 36, and the like. The various information transmitted to the interchangeable lens 3 is, for example, a control command such as a lens drive instruction, control contents such as the drive amount of the lens, model information of the camera body 2, and the like. The control command also includes a drive command for the focus lens 36b, and the like. The lens-side control unit 33 receives various control commands from the body-side control unit 23 by command and data communication, obtains control contents from the body-side control unit 23, and transmits response contents (for example, information on the execution status of the initialization process such as initialization in progress and initialization completion in response to the control command for initialization from the camera body 2) to the body-side control unit 23. That is, the lens-side control unit 33 receives various control instructions from the body-side control unit 23 , acquires various information from the body-side control unit 23 , and transmits various information to the body-side control unit 23 through command and data communication.

[0071] Figure 3 1 is an example of a timing diagram showing the timing of command data communication. When command data communication starts (T1), the body side control unit 23 first checks the signal level of the RDY (B) terminal. The signal level of the RDY (B) terminal indicates whether command data communication of the lens side control unit 33 is possible. When command data communication is not possible, the lens side control unit 33 makes the signal level (potential) of the RDY (L) terminal high (H level). When command data communication is possible, the lens side control unit 33 makes the signal level (potential) of the RDY (L) terminal low (L level) via the lens side communication unit 34.

[0072] When the command data communication starts (T1), if the signal level of the RDY (B) terminal is low level (L level), the body side control unit 23 outputs the C clock signal 401 from the CLK (B) terminal via the body side communication unit 24. That is, the body side control unit 23 sends the C clock signal 401 to the lens side control unit 33 via the CLK (B) terminal and the CLK (L) terminal. Figure 3 The frequency of the C clock signal 401 that repeats the high level and the low level is, for example, 8 MHz. The body side control unit 23 outputs the body side command signal 402 as a control instruction from the DATAB (B) terminal in synchronization with the C clock signal 401. That is, the body side control unit 23 sends the body side command signal 402 to the lens side control unit 33 via the DATAB (B) terminal and the DATAB (L) terminal. Figure 3 The body side command signal 402 shown by the switching between the high level and the low level of DATAB is a signal indicating that the body side control unit 23 instructs the lens side control unit 33 to control through command data communication. For example, the body side command signal 402 is a signal indicating the model information of requesting the replacement of the lens 3, and a signal indicating the driving of the focus lens 36b. Figure 3 As shown, the timing of sending the body-side command signal 402 is different from the period of the C-clock signal 401. In the case of the initialization process performed when the camera system 1 is powered on (powered on) and / or the end process performed when the power is turned off, the command signal 402 is periodically sent at a minimum interval of about 8 milliseconds, but otherwise, it can be sent at an arbitrary timing.

[0073] When receiving the body-side command signal 402 via the lens-side communication unit 34, the lens-side control unit 33 performs a check process for checking whether there is a communication error in the body-side command signal 402 using an error detection code (e.g., checksum data) included in the body-side command signal 402. 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.

[0074] The lens-side control unit 33 starts a first control process 404 based on the instruction of the received body-side command signal 402 .

[0075] When the first control process 404 is completed, the lens-side control unit 33 sets the signal level of the RDY (L) terminal to a low level (L level) (T3) via the lens-side communication unit 34. When the signal level of the RDY (B) terminal is a low level, the body-side control unit 23 outputs a C clock signal 405 from the CLK (B) terminal. The frequency of the C clock signal 405, which repeats the high level and the low level, is the same as that of the C clock signal 401, for example, 8 MHz. That is, the body-side control unit 23 sends the C clock signal 405 to the lens-side control unit 33 via the CLK (B) terminal and the CLK (L) terminal.

[0076] When the signal level of the RDY (B) terminal is at a high level, the body-side control unit 23 does not transmit or receive the body-side data signal 406 or the lens-side data signal 407 .

[0077] The body-side control section 23 outputs a body-side data signal 406 from the DATAB (B) terminal via the body-side communication section 24 in synchronization with the C clock signal 405. That is, the body-side control section 23 sends the body-side data signal 406 to the lens-side control section 33 via the DATAB (B) terminal and the DATAB (L) terminal. The body-side data signal 406 is a signal indicating a control parameter of the body-side command signal 402. For example, when the body-side command signal 402 is a signal indicating an instruction to drive the focus lens 36b, the corresponding body-side data signal 406 is a signal indicating the driving amount of the focus lens 36b. Alternatively, the body-side data signal 406 is a signal indicating information (such as the model information of the camera body) required by the lens-side control section 33 in the command data communication.

[0078] When the 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. Figure 3 The lens side data signal 407 shown by the switching between the high level and the low level of DATAL is a signal sent by the lens side control unit 33 to the body side control unit 23 through the command data communication. For example, when the body side command signal 402 is a signal indicating the model information of the request to replace the lens 3, the corresponding lens side data signal 407 is a signal indicating the model information of the replaceable lens 3. Figure 3 As shown in FIG. 1 , the timing of transmitting the body side data signal 406 and the lens side data signal 407 is different from the period of the C clock signal 405. In the case of the initialization process performed when the camera system 1 is powered on (powered on) and / or the termination process performed when the power is turned off, the body side data signal 406 and the lens side data signal 407 are periodically transmitted at a minimum interval of about 8 milliseconds, but otherwise, they are transmitted at an arbitrary timing.

[0079] When the transmission of the lens side data signal 407 is completed, the lens side control unit 33 sets the signal level of the RDY (L) terminal to high level again (T4). Based on the instruction of the received body side data signal 406, the lens side control unit 33 starts the second control process 408 (described later).

[0080] Here, the first control process 404 and the second control process 408 performed by the lens side control unit 33 are described. For example, the case where the received body side command signal 402 is a content of specific information requesting replacement of the lens 3 is described. As the first control process 404, the lens side control unit 33 performs a process of generating the requested information as a lens side data signal 407. The lens side data signal 407 generated by the first control process 404 is transmitted to the body side communication unit 24 of the body side control unit 23 via the lens side communication unit 34, the DATAL (L) terminal, and the DATAL (B) terminal.

[0081] For example, the case where the received body-side command signal 402 is a signal indicating an instruction to drive the focus lens 36b is described. As the first control processing 404, the lens-side control unit 33 performs processing to generate a signal indicating that a signal indicating an instruction to drive the focus lens 36b has been received. The signal generated by the first control processing 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. As the second control processing 408, the lens-side control unit 33 performs processing to drive the lens 36b according to the drive amount specified by the body-side data signal 406.

[0082] When the second control process 408 is completed, the lens-side control unit 33 sets the RDY (L) terminal to a low level via the lens-side communication unit 34 ( T5 ).

[0083] The communication performed at the timing T1 to T5 is a single command data communication. In a single command data communication, the body side control unit 23 sends a body side command signal 402 and a body side data signal 406. That is, the body side command signal 402 and the body side data signal 406 together constitute a control instruction (command) and control content (control data).

[0084] As described above, the lens-side control unit 33 concurrently receives control instructions (commands) and control contents (control data) from the body-side control unit 23 and transmits response contents (response data) to the body-side communication unit 24. That is, the command and data communication is a so-called full-duplex communication.

[0085] (Instructions for hotline communication)

[0086] As another communication system, there is communication in which data is transmitted in one direction (unidirectionally) from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2, which is called hotline communication. Hotline communication is data communication performed by the body-side control unit 23 and the lens-side control unit 33 via the body-side communication unit 24 and the lens-side communication unit 34 using the HCLK (B) terminal, the HCLK (L) terminal, the HDATA (B) terminal, and the HDATA (L) terminal. The body-side control unit 23 obtains information on the state of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 through the hotline communication. The information on the state of the interchangeable lens 3 is, for example, the position of the focus lens 36b, the position of the hand-shake correction lens (not shown), the drive position of the aperture blades, and the like. The hand-shake correction lens is a member that can be moved (driven) in a manner including a component in a direction perpendicular to the optical axis direction, and the aperture is a member that can be moved (driven) in a manner changing the size of the opening through which the light beam passes. This hotline communication is a communication in which, when an instruction to start communication is sent from the camera body through command data communication, the lens-side control unit 33 autonomously sends lens data to the body-side control unit 23 independently of the command data communication until an instruction to end communication is sent.

[0087] Figure 4 : is an example of a timing chart showing the timing of hot line communication. When the lens side control unit 33 receives a command to start hot line communication from the body side control unit 23 of the camera body through command data communication (T6), it performs generation processing 501. Generation processing 501 is, for example, a process of acquiring the state of the lens with a sampling period of 1 millisecond and generating a lens signal 503 for hot line 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 sent to the body side control unit 23 via the HCLK (L) terminal and the HCLK (B) terminal. Figure 4 The frequency of the H clock signal 502 of the hotline communication that repeats the high level and the low level is, for example, 2.5 MHz to 8 MHz. That is, the frequency of the H clock signal 502 of the hotline communication may be the same as the frequency of the C clock signal 401 of the command data communication, or may be lower than the frequency of the C clock signal 401 of the command data communication. That is, the period of the H clock signal 502 of the hotline communication may be the same as the period of the C clock signal 401 of the command data communication, or may be longer than the period of the C clock signal 401 of the command data communication.

[0088] In addition, you can also Figure 4The frequency of the H clock signal 502 that repeats the high level and the low level is set to 8 MHz to 20 MHz. That is, the frequency of the H clock signal 502 for hotline communication can be the same as the frequency of the C clock signal 401 for command data communication, or it can be higher than the frequency of the C clock signal 401 for command data communication.

[0089] The lens side control unit 33 outputs the lens signal 503 (for example, information on the position of the focus lens 36b) generated by the generation process 501 from the HDATA (L) terminal via the lens side communication unit 34 in synchronization with the H clock signal 502. 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. Figure 4 The lens signal 503 shown by the switching between the high level and the low level of HDATA is a signal sent by the lens side control unit 33 to the body side control unit 23 via hotline communication. The output of the H clock signal 502 and the lens signal 503 ends at timing T8.

[0090] The lens side control unit 33 repeatedly transmits lens data via hotline communication at regular intervals (for example, 1 millisecond) until receiving an instruction to stop transmitting the lens signal 503 via command data communication. Figure 4 As shown, the timing of transmitting lens data via hotline communication is different from the period of H clock signal 502. The transmission interval of lens data via hotline communication is shorter than the transmission and reception interval of control instructions (commands) and control contents (control data) via command data communication described above.

[0091] The command data communication and the hotline communication can be executed partly or all at the same time. That is, the body side control unit 23 and the lens side control unit 33 can start or end the hotline communication while the command data communication is in progress. In addition, the command data communication can be started or ended while the hotline communication is in progress.

[0092] As described above, the hotline communication is performed independently of the command communication. The lens-side control unit 33 transmits information related to the state of the interchangeable lens 3 to the body-side control unit 23 via the hotline communication independently of the command communication. Therefore, even during the command communication, the body-side control unit 23 can continue to grasp the state of the interchangeable lens 3. Therefore, since the body-side control unit 23 can continue to grasp the position of the focus lens 36b, for example, the auto focus can be controlled at a high speed. The same is true for the hand shake correction control and / or the aperture control.

[0093] Furthermore, even while the lens-side control section 33 is performing hotline communication, the body-side control section 23 can issue various instructions to the interchangeable lens 3 at arbitrary timings through command communication.

[0094] (Description of lens assembly mechanism)

[0095] The camera system 1 of this embodiment includes a so-called bayonet-type lens mounting mechanism. The body-side mount 21 included in the camera body 2 and the lens-side mount 31 included in the interchangeable lens 3 will be described below in order.

[0096] Figure 5 (a) is a diagram schematically showing the assembly parts of the camera body 2 as viewed from the interchangeable lens 3 side. The camera body 2 has Figure 1 The body side assembly part 21 and the body side terminal holding part 22 described in the figure. The body side assembly part 21 has an annular reference surface, and the annular reference surface has a certain width. In addition, the body side assembly part 21 has a body side first claw part 29a, a body side second claw part 29b, a body side third claw part 29c, and a body side fourth claw part 29d. In the following description, these four claw parts are collectively referred to as the body side claw part 29.

[0097] The body side claws 29 are arranged at intervals from each other along the circular opening of the body side mounting member 21. Figure 5 As shown in (a), the first body side claw 29a is arranged at the upper right position, the second body side claw 29b is arranged at the upper left position, the third body side claw 29c is arranged at the lower left position, and the fourth body side claw 29d is arranged at the lower right position.

[0098] Specifically, the first body claw 29a is the longest, the third body claw 29c is the second longest, the fourth body claw 29d is the third longest, and the second body claw 29b is the shortest.

[0099] The body side claw portion 29 protrudes from the body side assembly 21 toward the center of the opening, and there are portions where the body side claw portion 29 exists and portions where the body side claw portion 29 does not exist on the circumference of the opening. In the following description, the space 40a between the first body side claw portion 29a and the fourth body side claw portion 29d on the circumference of the opening of the body side assembly 21 is referred to as the first body side plug-in portion 40a. Similarly, the space 40b between the first body side claw portion 29a and the second body side claw portion 29b is referred to as the second body side plug-in portion 40b, the space 40c between the second body side claw portion 29b and the third body side claw portion 29c is referred to as the third body side plug-in portion 40c, and the space 40d between the third body side claw portion 29c and the fourth body side claw portion 29d is referred to as the fourth body side plug-in portion 40d. These four body side plug-in portions are collectively referred to as the body side plug-in portion 40.

[0100] The body side terminal holding portion 22 is provided inside the opening of the body side mounting part 21. The body side terminal holding portion 22 has an arc shape corresponding to the shape of the annular body side mounting part 21. The body side terminal holding portion 22 is arranged in parallel with the opening of the body side mounting part 21 at the upper part of the opening of the body side mounting part 21. Figure 5 (a) is arranged in the center of the upper part. 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 a row and in an arc shape on the inner side of the body-side assembly 21 in the body-side terminal holding portion 22. Figure 5 As shown in (a), 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, and LDET(B) is arranged on the left. The terminal group on the body side is a conductive pin. The terminal group on the body side is oriented in the -Z direction ( Figure 1 -Z direction is the direction of the subject, that is, the direction toward the interchangeable lens 3 attached to the camera.

[0101] The body side assembly 21 has a hole through which the lock pin 42 passes. The hole through which the lock pin 42 passes is arranged at the upper right of the body side fourth claw portion 29d. That is, in the annular reference surface of the body side assembly 21, the hole of the lock pin 42 is arranged in the opening of the body side assembly 21 between the area where the body side fourth claw portion 29d is present and the area where the body side first claw portion 29a is present. The lock pin 42 is directed in the -Z direction ( Figure 1 ) push.

[0102] Figure 5(b) is a schematic diagram of the assembly of the camera body 2 after the body-side assembly 21 is removed, as viewed from the interchangeable lens 3 side. A first leaf spring 41a is provided at a position corresponding to the first body-side claw 29a (on the inner side of the first body-side claw 29a). Similarly, a second leaf spring 41b is provided at a position corresponding to the second body-side claw 29b (on the inner side of the second body-side claw 29b), a third leaf spring 41c is provided at a position corresponding to the third body-side claw 29c (on the inner side of the third body-side claw 29c), and a fourth leaf spring 41d is provided at a position corresponding to the fourth body-side claw 29d (on the inner side of the fourth body-side claw 29d). In the following description, these four leaf springs are collectively referred to as leaf springs 41. The leaf spring 41 presses the lens-side claw described later in the +Z direction (on the camera body 2 side).

[0103] Figure 6 FIG. 2 is a diagram schematically showing the assembly of the interchangeable lens 3 as viewed from the camera body 2. The interchangeable lens 3 has Figure 1 The lens side mounting part 31 and the lens side terminal retaining part 32 described in the figure. The lens side mounting part 31 has an annular reference surface, and the annular reference surface has a certain width. When the interchangeable lens 3 is attached to the camera body 2, the annular reference surface of the lens side mounting part 31 contacts the annular reference surface of the aforementioned body side mounting part 21. Moreover, the lens side mounting part 31 has a cylindrical part extending along the optical axis direction on its inner periphery. The lens side mounting part 31 has a first lens side claw part 39a, a second lens side claw part 39b, a third lens side claw part 39c, and a fourth lens side claw part 39d spaced apart from each other along the outer periphery of its cylindrical part. In the following description, these four claw parts are collectively referred to as the lens side claw part 39.

[0104] 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 mounting outside (in a direction radiating from the optical axis O). Figure 6 As shown in the figure, the first claw 39a on the lens side is arranged at the upper left position, the second claw 39b on the lens side is arranged at the upper right position, the third claw 39c on the lens side is arranged at the lower right position, and the fourth claw 39d on the lens side is arranged at the lower left position. There is a space on the rear side of the lens side claw 39 (the reference surface side of the lens side mounting member 31) for the corresponding body side claw 29 to enter when the interchangeable lens 3 is attached to the camera body 2.

[0105] A lens-side terminal holding portion 32 is provided inside the opening of the lens-side mounting member 31. The lens-side terminal holding portion 32 has an arc shape corresponding to the shape of the annular lens-side mounting member 31. The lens-side terminal holding portion 32 is arranged in parallel with the opening of the lens-side mounting member 31 at the upper portion of the lens-side mounting member 31, preferably, as shown in FIG. Figure 6As shown in FIG. 1 , the lens side terminal holding portion 32 is arranged in the center of the upper portion. 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 a row and in an arc shape on the inner side of the lens side mounting member 31 in the lens side terminal holding portion 32. Figure 6 As shown in the figure, from the right, there are 11 terminals: LDET (L), VBAT (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L). The lens side terminal group is arranged so that the conductive contact surface of each terminal faces the +Z direction ( Figure 1 The +Z direction is the direction in which the subject light after passing through the imaging optical system 36 is directed toward the imaging element 27.

[0106] The lens side mounting part 31 has a lock pin receiving portion 43. Figure 6 As shown in FIG. 1 , the lock pin receiving portion 43 is arranged on the upper left of the fourth claw portion 39d on the lens side. That is, the lock pin receiving portion 43 is arranged between the portion corresponding to the first claw portion 39a on the lens side and the portion corresponding to the fourth claw portion 39d on the lens side in the lens side mounting member 31. The lock pin receiving portion 43 is a groove for receiving the lock pin 42 when the interchangeable lens 3 is attached to the camera body 2. The groove is oriented in the -Z direction ( Figure 1 ) settings.

[0107] When the interchangeable lens 3 is attached to the camera body 2, the plurality of body-side terminals are physically contacted with the corresponding plurality of lens-side terminals. Through this contact, the plurality of body-side terminals are electrically connected with the plurality of lens-side terminals. That is, the plurality of body-side terminals are electrically connected with the plurality of lens-side terminals.

[0108] (Accessory for replacement lens)

[0109] The method of attaching the interchangeable lens 3 to the camera body 2 is described. When attaching the interchangeable lens 3 to the camera body 2, first, the body-side mounting member 21 and the lens-side mounting member 31 are opposed to each other, and the first lens-side claw portion 39a is matched with the position of the first body-side plug-in portion 40a, the second lens-side claw portion 39b is matched with the position of the second body-side plug-in portion 40b, the third lens-side claw portion 39c is matched with the position of the third body-side plug-in portion 40c, and the fourth lens-side claw portion 39d is matched with the position of the fourth body-side plug-in portion 40d. Then, the first lens-side claw portion 39a is inserted into the first body-side plug-in portion 40a, the second lens-side claw portion 39b is inserted into the second body-side plug-in portion 40b, the third lens-side claw portion 39c is inserted into the third body-side plug-in portion 40c, and the fourth lens-side claw portion 39d is inserted into the fourth body-side plug-in 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.

[0110] From this state, the interchangeable lens 3 is moved along Figure 5 as well as Figure 6 The camera body 2 is rotated in the attachment direction 44 shown. That is, the first claw 29a on the body side is made to enter the space on the inner side of the first claw 39a on the lens side, the second claw 29b on the body side is made to enter the space on the inner side of the second claw 39b on the lens side, the third claw 29c on the body side is made to enter the space on the inner side of the third claw 39c on the lens side, and the fourth claw 29d on the body side is made to enter the space on the inner side of the fourth claw 39d on the lens side. At this time, a plurality of lens side terminals are contacted with a plurality of body side terminals in sequence. Alternatively, the interchangeable lens 3 may be not rotated, but the camera body 2 may be rotated in a direction corresponding to the rotation of the interchangeable lens 3. Figure 5 as well as Figure 6 The attachment direction 44 is shown as rotating in the opposite direction.

[0111] When the lens-side claw portion 39 is inserted into the corresponding body-side plug-in portion 40 and rotated along the attachment direction 44, for example, the LDET (L) terminal sequentially contacts the CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, VBAT (B) terminal, and LDET (B) terminal. For example, the VBAT (L) terminal sequentially contacts the DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, and VBAT (B) terminal. For example, the PGND (L) terminal sequentially contacts the HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, and PGND (B) terminal. For example, the V33 (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, the DATAB (B) terminal, the RDY (B) terminal, the GND (B) terminal, and the V33 (B) terminal. For example, the GND (L) terminal sequentially contacts the HDATA (B) terminal, the HCLK (B) terminal, the DATAL (B) terminal, the CLK (B) terminal, the DATAB (B) terminal, the RDY (B) terminal, and the GND (B) terminal.

[0112] For example, the RDY(L) terminal sequentially contacts the HDATA(B) terminal, the HCLK(B) terminal, the DATAL(B) terminal, the CLK(B) terminal, the DATAB(B) terminal, and the RDY(B) terminal. For example, the DATAB(L) terminal sequentially contacts the HDATA(B) terminal, the HCLK(B) terminal, the DATAL(B) terminal, the CLK(B) terminal, and the DATAB(B) terminal. For example, the CLK(L) terminal sequentially contacts the HDATA(B) terminal, the HCLK(B) terminal, the DATAL(B) terminal, and the CLK(B) terminal. For example, the DATAL(L) terminal sequentially contacts the HDATA(B) terminal, the HCLK(B) terminal, and the DATAL(B) terminal. For example, the HCLK(L) terminal sequentially contacts the HDATA(B) terminal and the HCLK(B) terminal.

[0113] When the interchangeable lens 3 is rotated relative to the camera body 2 by a predetermined angle, the attachment completion position is reached. At the attachment completion position, the corresponding body side claw portion 29 and lens side claw portion 39 are opposed to each other in the optical axis direction, and the lock pin 42 is pushed forward. Figure 1The lock pin 42 is pushed in the -Z direction and enters the lock pin receiving portion 43. When the lock pin 42 enters the lock pin receiving portion 43, the interchangeable lens 3 cannot be rotated relative to the camera body 2 for removal. That is, when the body side claw portion 29 and the lens side claw portion 39 reach the predetermined attachment completion position, the relative position of the body side mounting part 21 and the lens side mounting part 31 is fixed. The lens side claw portion 39 is pushed toward the body side ( Figure 1 As a result, each of the plurality of lens-side terminals contacts and is electrically connected to each of the plurality of body-side terminals that correspond to the lens-side terminals.

[0114] In the following description, the state in which the body-side claw portion 29 and the lens-side claw portion 39 have reached the predetermined attachment completion position is referred to as the attachment completion state. The state in which the lens-side claw portion 39 is rotated from the position where it is inserted into the body-side insertion and removal portion 40 to the position halfway before reaching the attachment completion position, or the state in which the lens-side claw portion 39 is rotated from the position halfway before reaching the attachment completion position to the insertion position is referred to as the attachment mid-state.

[0115] When the camera is in the attachment state, the signal level of the LDET (B) terminal is pulled up to a high level. When the body-side control unit 23 detects that the signal level of the LDET (B) terminal is a high level, it determines that the interchangeable lens 3 is not attached. When the interchangeable lens 3 is not attached, the body-side control unit 23 does not cause the power supply unit 26 to supply power to the VBAT (B) terminal and the V33 (B) terminal.

[0116] When the attachment is completed, as described above ( Figure 2 ), the signal level of the LDET (B) terminal is pulled down to a low level. When the signal level of the LDET (B) terminal is detected to be a low level, the body-side control unit 23 determines that the interchangeable lens 3 is attached. In addition, in the attachment completion state, the lock pin 42 enters the lock pin receiving portion 43, and the switch 28 ( Figure 1 ) is turned on. When it is detected that the signal level of the LDET (B) terminal is low and the switch 28 is turned on, the body-side control section 23 causes the power supply section 26 to start supplying power to the V33 (B) terminal, that is, the power supply section 26 supplies the power supply voltage of the circuit system. In addition, the camera body 2 does not necessarily have to include the switch 28. In the case of not having the switch 28, the power supply section 26 may start supplying power to the V33 (B) terminal at the time point when it is detected that the signal level of the LDET (B) terminal becomes low.

[0117] When the 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 to operate. After the lens-side control unit 33 starts to operate, the initial communication based on the command data communication is allowed between the lens-side control unit 33 and the body-side control unit 23. After the lens-side control unit 33 allows the initial communication, the body-side control unit 23 starts the initial communication. The initial communication includes a signal requesting the supply of power to the VBAT (L) terminal from the lens-side control unit 33. When the signal requesting the supply of power to the VBAT (L) terminal is sent 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 performs the initialization process between the camera body 2 and the interchangeable lens 3. In the initialization process, information required for various operations of the camera system 1 such as the photographing operation and / or the focus adjustment operation is exchanged between the camera body 2 and the interchangeable lens 3, and the lens position of the interchangeable lens is moved to the reference position.

[0118] When the user presses the unlock button (not shown) of the camera body in the attachment completion state, the lock pin 42 retracts from the lock pin receiving portion 43. As a result, the relative position of the body side mount 21 and the lens side mount 31 changes. When the user presses the unlock button (not shown), the switch 28 linked to the unlock button is turned off, and the body side control unit 23 causes the power supply unit 26 to stop supplying power to the VBAT (B) terminal and the V33 (B) terminal. From this state, the interchangeable lens 3 is moved to the position corresponding to the lens side mount 31. Figure 5 as well as Figure 6 When rotating in the direction opposite to the attachment direction 44 shown, the plurality of lens-side terminals come into contact with the plurality of body-side terminals in the reverse order to that described above.

[0119] In addition, the power supply may be stopped without being linked to the operation of the lock release button. In this case, the body-side control unit 23 separates the LDET (L) terminal and the LDET (B) terminal by rotating in the direction opposite to the attachment direction 44 of the interchangeable lens 3, and when the signal level of the LDET (B) terminal is detected to change from a low level to a high level, the power supply unit 26 stops supplying power to the VBAT (B) terminal and the V33 (B) terminal. In this way, the number of components of the camera system 1 can be reduced. In addition, it is also possible to stop supplying power to the VBAT (B) terminal and the V33 (B) terminal when both the lock release button is pressed and the signal level of the LDET (B) terminal is changed from a low level to a high level. Alternatively, it is also possible to stop supplying power to the VBAT (B) terminal and the V33 (B) terminal when either the lock release button is pressed or the signal level of the LDET (B) terminal is changed from a low level to a high level is detected.

[0120] As described above, when the interchangeable lens is being mounted or removed from the camera body (in the mid-attachment state), the lens-side terminal may contact the body-side terminal other than the terminal that should correspond when the mounting is completed. It is preferred that the arrangement of the lens-side terminal and the body-side terminal is such that the occurrence of defects caused by the contact during mounting or removal is minimized.

[0121] (Terminal arrangement considering noise)

[0122] In this embodiment, the LDET (B) terminal among the plurality of body-side terminals is arranged in the lens attachment direction ( Figure 5 That is, as mentioned above, the configuration position of the LDET (B) terminal is Figure 5 (a) is the leftmost terminal group on the body side. The LDET (L) terminal among the multiple lens side terminals is also arranged in the same way in the lens attachment direction ( Figure 6 That is, as described above, the configuration position of the LDET (L) terminal is Figure 6 Therefore, until the attachment of the lens is completed, the LDET (B) terminal does not come into contact with the lens side terminals other than the LDET (L) terminal. Therefore, during the attachment of the replacement lens, the signal level of the LDET (B) terminal does not erroneously become a low level, and the lens attachment is not erroneously recognized.

[0123] In the present embodiment, the VBAT (B) terminal is arranged next to the LDET (B) terminal, that is, arranged at the second position from the front end in the attachment direction. The VBAT (L) terminal is arranged next to the LDET (L) terminal, that is, arranged at the second position from the front end in the attachment direction. This is to reduce the number of terminals on the lens side that are contacted by the VBAT (B) terminal on the camera body side during the lens attachment process. Since the power supply voltage of the drive system applied to the VBAT (B) terminal is higher than the voltage of other terminals, when the VBAT (B) terminal contacts terminals other than the VBAT (L) terminal due to a malfunction of the camera system 1 or the like, the high voltage may apply an unexpected load to the circuit in the interchangeable lens. In the present embodiment, since the VBAT (B) terminal is located next to the LDET (B) terminal, during the attachment of the interchangeable lens 3, among the multiple lens-side terminals, only the LDET (L) terminal will uniquely contact the VBAT (B) terminal. Figure 2 As shown, the LDET (L) terminal is grounded via the resistor R3 , and even if a high voltage is applied from the VBAT (B) terminal, the camera system 1 is not affected.

[0124] In the present embodiment, a PGND(B) terminal as a ground potential is arranged next to the VBAT(B) terminal, that is, at the third position from the front end in the attachment direction. The PGND(L) terminal is arranged next to the VBAT(L) terminal, that is, at the third position from the front end in the attachment direction. The high voltage supplied from the VBAT(B) terminal is charged in the capacitor C1 connected to the VBAT(L) terminal. When the interchangeable lens 3 is rotated in the 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 (ground terminal) as a ground potential, and does not affect other circuits of the camera system 1.

[0125] In the present embodiment, a V33(B) terminal is arranged next to the PGND(B) terminal, i.e., at the fourth position from the front end in the attachment direction, and a GND(B) terminal is arranged next to it, i.e., at the fifth position from the front end. A V33(L) terminal is arranged next to the PGND(L) terminal, i.e., at the fourth position from the front end in the attachment direction, and a GND(L) terminal is arranged next to it, i.e., at the fifth position from the front end. The voltage supplied from the V33(B) terminal is charged 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 (ground terminal) which is the ground potential, and does not affect other circuits of the camera system 1.

[0126] Next to the GND (B) terminal, i.e., at the sixth position from the front end, there is a RDY (B) terminal, next to it, i.e., at the seventh position from the front end, there is a DATAB (B) terminal, next to it, i.e., at the eighth position from the front end, there is a CLK (B) terminal, next to it, i.e., at the ninth position from the front end, there is a DATAL (B) terminal, and next to it, i.e., at the tenth position from the front end, there is a HCLK (B) terminal, and at the very end next to it, there is a HDATA (B) terminal.

[0127] Next to the GND (L) terminal, i.e., at the sixth position from the front end, there is a RDY (L) terminal, next to it, i.e., at the seventh position from the front end, there is a DATAB (L) terminal, next to it, i.e., at the eighth position from the front end, there is a CLK (L) terminal, next to it, i.e., at the ninth position from the front end, there is a DATAL (L) terminal, and next to it, i.e., at the tenth position from the front end, there is a HCLK (L) terminal, and at the very end next to it, there is a HDATA (L) terminal.

[0128] Next, the influence of noise caused by the communication line composed of each body-side terminal and each lens-side terminal is described. Hotline communication is a communication that sends information (lens data) to the body in one direction after the communication starts, and is performed at a high frequency (repeatedly in an extremely short cycle). During hotline communication, a clock signal (H clock signal) is transmitted from the HCLK (L) terminal to the HCLK (B) terminal. Since the clock signal is a signal that repeats the high level and the low level in a short cycle, it becomes a larger noise source than other signals. In addition, since the clock signal sent from the HCLK (L) terminal to the HCLK (B) terminal is a signal output from the interchangeable lens 3, even if noise is erroneously added to the clock signal, the camera body 2 side cannot recognize the noise. In this way, there is a possibility that the clock signal (H clock signal) flowing through the HCLK terminal becomes a noise source and / or there is a possibility that noise is added to the clock signal (H clock signal), which may cause malfunction of the camera system 1. Examples of malfunctions include erroneous detection of attachment of an interchangeable lens and confusion as to whether or not command communication can be performed.

[0129] In the present embodiment, the HCLK terminal is arranged at a position away from the VBAT terminal to which a high voltage is applied. In addition, the HCLK terminal is arranged away from the RDY terminal for indicating whether command communication can be performed. Since the voltage and current of the VBAT terminal of the drive unit 37 that drives the interchangeable lens 3 will change according to the driving state of the drive unit 37, the change of the voltage and current of the VBAT terminal may become noise for other terminals. Therefore, by separating the VBAT terminal from the HCLK terminal, the noise generated by the change of the voltage and current of the VBAT terminal can be suppressed from affecting the clock signal (H clock signal). It is possible to suppress the addition of noise to the clock signal (H clock signal).

[0130] The RDY terminal is a terminal used to indicate whether command communication is possible. The HCLK terminal, which may become a noise source, is configured away from the RDY terminal so as not to be adjacent to the RDY terminal. Therefore, it is possible to suppress the influence of noise generated by the clock signal (H clock signal) on the signal of the RDY terminal.

[0131] In addition, HDATA and DATAL terminals are arranged on both sides of the HCLK terminal. Thus, the influence of the noise of the HCLK terminal on terminals other than the HDATA and DATAL terminals can be suppressed. The variation of the signal flowing through the HDATA and DATAL terminals is less than that of the clock signal (H clock signal). Therefore, this is to suppress the influence of the variation of the clock signal (H clock signal) on terminals other than the HDATA and DATAL terminals.

[0132] Next, as described above, command data communication is a communication that bidirectionally sends and receives information between the fuselage body and the interchangeable lens. During command data communication, a clock signal (C clock signal) is transmitted from the CLK (B) terminal to the CLK (L) terminal. For the same reasons as above, the clock signal sent by the CLK terminal will also become a noise source. In addition, when noise is added to the clock signal (C clock signal), an abnormality will occur in the command communication. Therefore, in this embodiment, the CLK terminal is configured at a position away from the VBAT terminal to which a high voltage is applied. Since the voltage and current of the VBAT terminal of the drive unit 37 that drives the interchangeable lens 3 will change according to the driving state of the drive unit 37, the changes in the voltage and current of the VBAT terminal may become noise for other terminals. Therefore, by separating the VBAT terminal from the CLK terminal, it is possible to suppress the influence of the noise of the VBAT terminal on the clock signal (C clock signal). That is, it is possible to suppress the addition of noise to the clock signal (C clock signal).

[0133] In addition, the CLK terminal is arranged away from the RDY terminal for indicating whether command communication is possible.

[0134] In addition, when the HCLK terminal and the CLK terminal are adjacent, the clock signal on one side will affect the other clock signal and become a noise source. In the present embodiment, a DATAL terminal is arranged between the CLK terminal and the HCLK terminal. In addition, a DATAB terminal is arranged between the CLK terminal and the RDY terminal. That is, a DATAL terminal and a DATAB terminal are arranged on both sides of the CLK terminal. Thus, the influence of the noise caused by the CLK terminal on the camera system can be suppressed. Since the variation of the signal flowing through the DATAL terminal and the DATAB terminal is less than that of the clock signal (C clock signal), this is to suppress the influence of the variation of the clock signal (C clock signal) on the terminals other than the DATAL terminal and the DATAB terminal.

[0135] When the DATAL terminal is arranged between the CLK terminal and the HCLK terminal, since the variation of the signal flowing in the DATAL terminal is less than that of the clock signal (C clock signal) of the CLK terminal and the clock signal (H clock signal) of the HCLK terminal, this is to suppress the influence of the variation of the clock signal (C clock signal) of the CLK terminal on the clock signal (H clock signal) of the HCLK terminal, and to suppress the influence of the variation of the clock signal (H clock signal) of the HCLK terminal on the clock signal (C clock signal) of the CLK terminal.

[0136] In addition, as described above, in order to communicate command data, it is necessary to determine the level of the RDY terminal. That is, since the signal level of the RDY terminal indicates whether the command data can be communicated, the influence of noise on the shooting operation is large. Here, the following case is considered: although the command data cannot be communicated, the body-side control unit 23 mistakenly recognizes that the communication is possible due to noise. In this case, although the lens-side control unit 33 cannot receive the command data, the body-side control unit 23 sends the command data, and the body-side control unit 23 mistakenly recognizes that the lens is being replaced and the control is performed according to the command data. However, since the lens-side control unit 33 cannot receive the command data, the control according to the command data sent by mistake is not performed. Therefore, the operation of the camera system 1 will fail. Therefore, it is necessary to avoid adding noise to the signal of the RDY terminal. In order to avoid adding noise to the signal of the RDY terminal, it is preferable to arrange terminals on both sides of the RDY terminal through which a relatively stable signal, that is, a signal with less change in signal level per unit time, flows. In this embodiment, the GND terminal and the DATAB terminal are arranged on both sides of the RDY terminal. Since the GND terminal is a terminal of ground potential, it is stable, and the DATAB terminal is also a terminal through which a relatively stable signal flows compared to the CLK terminal and the HCLK terminal. Thus, the influence of noise on the signal of the RDY terminal can be suppressed.

[0137] Next, the power (power supply voltage of the driving system) supplied from the VBAT (B) terminal to the VBAT (L) terminal is used to drive the actuator (e.g., a stepping motor, etc.) of the drive unit 37 of the interchangeable lens 3. Therefore, the current flowing in the VBAT terminal will vary greatly when the actuator is driven and when it is not driven. Such a change in current will become a noise source relative to the signal flowing in other terminals. In this embodiment, the VBAT terminal is configured at a position away from the RDY terminal, DATAB terminal, CLK terminal, DATAL terminal for command data communication, and the HCLK terminal and HDATA terminal for hotline communication. In addition, the GND terminal, V33 terminal, and PGND terminal are configured between the VBAT terminal and these terminals for communication. Among them, in particular, since the GND terminal and the PGND terminal are terminals of ground potential, the influence of noise can be suppressed. As a result, the influence of noise caused by the change in the current flowing in the VBAT terminal on data communication can be suppressed.

[0138] Here, the terminal arrangement considering noise described above is summarized.

[0139] The RDY terminal is arranged away from the VBAT terminal and the HCLK terminal, which are noise sources, so as not to be adjacent to each other. This can suppress the influence of noise on the RDY terminal for indicating whether command communication is possible.

[0140] 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, the HCLK terminal, the DATAL terminal, the CLK terminal, and the DATAB terminal are sequentially arranged from the rear end in the attachment direction. This can suppress the influence of the noise caused by the clock signal on the RDY terminal and the like.

[0141] Furthermore, considering the influence of noise, the terminal group for power supply and the terminal group for communication are arranged separately with the RDY terminal clamped. If described in detail, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal as terminals for power supply are arranged in sequence from the front end side on the front end side of the attachment direction with the RDY terminal clamped, and the DATAB terminal, CLK terminal, DATAL terminal, HCLK terminal, and HDATA terminal as terminals for communication are arranged in sequence from the front end side on the rear end side of the attachment direction. In this way, the influence of the power supply system terminal group such as the VBAT terminal on the terminal for communication can be suppressed. In addition, the influence of noise on the RDY terminal of the power supply system terminal group such as the VBAT terminal and the terminal group for communication such as the HCLK terminal and the CLK terminal can be suppressed.

[0142] Of the HCLK terminal for the clock signal (H clock signal) transmitted for hotline communication and the CLK terminal for the clock signal (C clock signal) transmitted for command data communication, the HCLK terminal is arranged at a position farther from the VBAT terminal than the CLK terminal. This is because although the body-side control unit 23 outputs the clock signal (C clock signal) transmitted from the CLK terminal to the interchangeable lens via the body-side communication unit 24, when noise is added to the clock signal (H clock signal) transmitted from the interchangeable lens via the lens-side communication unit 34 and to the camera body via the HCLK (L) terminal, the body-side control unit 23 misidentifies the clock signal (H clock signal) transmitted, and therefore the noise added to the HCLK terminal has a greater impact on the camera system 1.

[0143] Of the HCLK terminal and the GND terminal, the HCLK terminal is disposed at a position farther from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is disposed between the GND terminal and the VBAT terminal. Thus, the HCLK terminal of the clock signal (H clock signal) transmitted for hotline communication can be shielded from noise caused by the VBAT terminal.

[0144] Of the CLK terminal and the GND terminal, the CLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, the PGND terminal is arranged between the GND terminal and the VBAT terminal. Thus, the noise caused by the VBAT terminal to the CLK terminal of the clock signal (C clock signal) for command data communication can be shielded.

[0145] (Terminal configuration considering wear)

[0146] Hereinafter, contact of each terminal when the interchangeable lens 3 is attached to or detached from the camera body 2 will be described.

[0147] When the interchangeable lens 3 is mounted on the camera body 2, the body-side terminals successively contact the lens-side terminals. The same is true when the interchangeable lens 3 is removed from the camera body 2. That is, the body-side terminals, which are pins protruding from the body-side terminal retaining portion 22, and the lens-side terminals, which are exposed conductive contact surfaces, rub against each other one by one. Since a plurality of interchangeable lenses are loaded and unloaded relative to one camera body, the body-side terminals are more susceptible to wear than the lens-side terminals. In particular, the body-side terminals located closer to the rear end of the attachment direction of the interchangeable lens 3 will be rubbed by a greater number of lens-side terminals and will rub more. Therefore, the wear of the front end of the pins of the body terminals located closer to the rear end is more likely to develop than that of the body-side terminals located at the front end. Since the wear of the body-side terminals affects the contact with the lens-side terminals, data communication may become unstable.

[0148] In this embodiment, since the LDET (B) terminal is arranged at the front end in the attachment direction, the wear of the LDET (B) terminal is minimal. As a result, the LDET (B) terminal and the LDET (L) terminal are in good contact, and the possibility of erroneous detection of the attachment and detachment of the interchangeable lens 3 is small.

[0149] As described above, in this embodiment, in order to suppress the influence of noise on communication, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position away from the VBAT(B) terminal. That is, the VBAT(B) terminal is arranged at the second position from the front end side of the attachment direction, and the CLK(B) terminal and the HCLK(B) terminal are arranged at the rear end side away from the VBAT(B) terminal. Therefore, compared with the LDET(B) terminal and the VBAT(B) terminal, the wear of the CLK(B) terminal and the HCLK(B) terminal becomes more. In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged near the first claw 29a on the body side. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the inner peripheral edge of the edge of the inner peripheral side of the first claw 29a on the body side than the VBAT(B) terminal. In other words, the distance between the CLK (B) terminal and the inner periphery of the first body claw 29a is made shorter than the distance between the VBAT (B) terminal and the inner periphery of the first body claw 29a, and the distance between the HCLK (B) terminal and the inner periphery of the first body claw 29a is made shorter than the distance between the VBAT (B) terminal and the inner periphery of the first body claw 29a. As described above, the first leaf spring 41a is provided on the inner side of the first body claw 29a, and the first leaf spring 41a is used to move in the +Z direction ( Figure 1 ) presses the first claw portion 39a on the lens side. Even from the perspective of the first leaf spring 41a, the distance between the CLK(B) terminal and the first leaf spring 41a and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the VBAT(B) terminal and the first leaf spring 41a. In addition, the LDET(B) terminal is also 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. As a result, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly toward the lens side terminal than the VBAT(B) terminal and the LDET(B) terminal.

[0150] On the lens side, the CLK(L) terminal and the HCLK(L) terminal are also arranged at a position closer to the inner periphery of the first claw portion 39a on the lens side than the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is made shorter than the distance between the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is made shorter than the distance between the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side. Therefore, the CLK(L) terminal and the HCLK(L) terminal located next to the first claw portion 39a on the lens side are pressed against the corresponding body side terminals by the first leaf spring 41a in the attached state. In addition, the LDET (L) terminal is also similar to the VBAT (L) terminal. In the attached state, the distance between the CLK (L) terminal and the first leaf spring 41a and the distance between the HCLK (L) terminal and the first leaf spring 41a are shorter than the distance between the LDET (L) terminal and the first leaf spring 41a. Therefore, in the attached state, the force pressing the CLK (L) terminal and the HCLK (L) terminal against the terminal on the body side acts more strongly than the LDET (L) terminal. Therefore, even if the CLK (B) terminal and the HCLK (B) terminal are worn, good contact can be maintained, and the respective clock signals can be stabilized, so that stable data communication can be performed. In addition, for example, even if an impact is applied to the camera body 2 and / or the interchangeable lens 3 in the attached state, the contact between the CLK (B) terminal and the CLK (L) terminal and the contact between the HCLK (B) terminal and the HCLK (L) terminal can be maintained.

[0151] Even when a part of the first claw portion 39a on the lens side is notched, the protrusion arranged in the area opposite to the first claw portion 29a on the body side and the notched portion can be combined to form the first claw portion on the lens side. As a method of forming the notch, the lens side claw portion can be divided into two or more parts in the circumferential direction to form a notch, or a part of the lens side claw portion can be notched, or at least a part of the lens side claw portion can be notched by shortening the radial length. In addition, the circumferential length of the lens side claw portion can also be changed within the range passing through the corresponding body side plug-in portion. The same applies to the second claw portion 39b on the lens side, the third claw portion 39c on the lens side, and the fourth claw portion 39d on the lens side. In addition, the radial thickness of the cylindrical portion can be appropriately changed, and it can also be a shape in which at least a part protrudes inward compared to the cylindrical portion of this embodiment.

[0152] 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 near the first body-side claw 29a. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the inner periphery of the first body-side claw 29a than the LDET(B) terminal and the VBAT(B) terminal. In other words, the distance between the CLK(B) terminal and the inner periphery of the first body-side claw 29a is made shorter than the distance between the LDET(B) terminal and the VBAT(B) terminal and the inner periphery of the first body-side claw 29a, and the distance between the HCLK(B) terminal and the inner periphery of the first body-side claw 29a is made shorter than the distance between the LDET(B) terminal and the VBAT(B) terminal and the inner periphery of the first body-side claw 29a. As described above, the first leaf spring 41a is provided on the inner side of the first claw portion 29a on the body side, and the first leaf spring 41a is used to move the first claw portion 29a in the +Z direction ( Figure 1 ) presses the first claw portion 39a on the lens side. Even from the perspective of the first leaf spring 41a, the distance between the CLK (B) terminal and the first leaf spring 41a and the distance between the HCLK (B) terminal and the first leaf spring 41a are shorter than the distance between the LDET (B) terminal and the VBAT (B) terminal and the first leaf spring 41a.

[0153] On the lens side, the CLK(L) terminal and the HCLK(L) terminal are also arranged at positions closer to the inner periphery of the first claw portion 39a on the lens side than the LDET(L) terminal and the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is made shorter than the distance between the LDET(L) terminal and the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is made shorter than the distance between the LDET(L) terminal and the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side. Therefore, the CLK(L) terminal and the HCLK(L) terminal located next to the first claw portion 39a on the lens side are pressed against the corresponding body side terminals by the first leaf spring 41a. As a result, the CLK(B) terminal and the HCLK(B) terminal are pressed more strongly toward the lens-side terminal 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. In addition, for example, even if an impact is applied to the camera body 2 and / or the interchangeable lens 3 while maintaining the attached state, the CLK(B) terminal and the HCLK(B) terminal can maintain contact with the lens-side terminal.

[0154] In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are also present in the vicinity of the fourth claw portion 29d on the body side. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the fourth claw portion 29d on the body side than the VBAT(B) terminal and the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the fourth claw portion 29d on the body side is made shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw portion 29d on the body side. In addition, the distance between the HCLK(B) terminal and the fourth claw portion 29d on the body side is made shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw portion 29d on the body side. As described above, there is a fourth leaf spring 41d on the inner side of the fourth claw portion 29d on the body side, and the fourth leaf spring 41d is used to move in the +Z direction ( Figure 1 ) presses the fourth claw 39d on the lens side. Therefore, the CLK (B) terminal and the HCLK (B) terminal located near the fourth claw 39d on the lens side are stably and strongly pressed against the lens side terminals compared to the VBAT (B) terminal and the LDET (B) terminal by the first leaf spring 41a and the fourth leaf spring 41d.

[0155] The distance between the aforementioned CLK (B) terminal and the first body-side claw 29a (the same is true for the fourth body-side claw 29d, but omitted below) is the straight-line distance between one end of the first body-side claw 29a and the CLK (B) terminal, and can also be specified by the straight-line distance between the other end of the first body-side claw 29a and the CLK (B) terminal. Alternatively, the distance between the aforementioned CLK (B) terminal and the first body-side claw 29a can also be specified by the straight-line distance between the middle position of the first body-side claw 29a in the circumferential direction of the body-side assembly 21 and the CLK (B) terminal. The distance between the other body-side terminals such as the HCLK (B) terminal, the VBAT (B) terminal, and the LDET (B) terminal and the first body-side claw 29a is also a straight-line distance. The distance between the first leaf spring 41a (the fourth leaf spring 41d) and the body-side terminal is also a straight-line distance.

[0156] In addition, the distance between the aforementioned CLK (B) terminal and the first body-side claw 29a (the same also applies to the fourth body-side claw 29d, but omitted below) can be defined as the arc-shaped distance between one end of the first body-side claw 29a and the CLK (B) terminal in the circumferential direction of the body-side assembly 21, or can be defined as the arc-shaped distance between the other end of the first body-side claw 29a and the CLK (B) terminal. Alternatively, the distance between the aforementioned CLK (B) terminal and the first body-side claw 29a can also be defined as the arc-shaped distance between the middle position of the first body-side claw 29a in the circumferential direction of the body-side assembly 21 and the CLK (B) terminal. The distances between other body-side terminals such as the HCLK (B) terminal, the VBAT (B) terminal, and the LDET (B) terminal and the first body-side claw 29a are also arc-shaped distances. The distance between the first leaf spring 41 a (fourth leaf spring 41 d ) and the body-side terminal is also an arc-shaped distance.

[0157] The camera body 2 is described above, but the same is true for the interchangeable lens 3. In the present embodiment, the CLK(L) terminal and the HCLK(L) terminal are arranged near the first claw portion 39a on the lens side. That is, the CLK(L) terminal and the HCLK(L) terminal are arranged at a position closer to the first claw portion 39a on the lens side than the VBAT(L) terminal and the LDET(L) terminal. In other words, the distance between the CLK(L) terminal and the first claw portion 39a on the lens side is made shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the first claw portion 39a on the lens side is made shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw portion 39a on the lens side. The first claw portion 39a on the lens side is moved in the +Z direction ( Figure 1 Therefore, similarly to the above, the CLK (L) terminal and the HCLK (L) terminal located near the first claw portion 39a on the lens side are pressed against the body side terminal more strongly than the VBAT (L) terminal or the LDET (L) terminal by the first leaf spring 41a.

[0158] In this embodiment, if Figure 5As shown in (a), the CLK (B) terminal and the HCLK (B) terminal are arranged inside the fan-shaped area (with an angle of 50) formed by the center position of the opening of the mounting member 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped first body-side claw 29a. Alternatively, the CLK (B) terminal and the HCLK (B) terminal are arranged inside the triangular area formed by the center position of the opening of the mounting member 21 (i.e., the position of the optical axis O of the interchangeable lens 3) and the two ends of the inner circumference of the first body-side claw 29a. Therefore, although the first body-side claw portion 29a does not exist on the extension line of the dashed line 51 connecting the center position of the opening of the assembly 21 and the LDET (B) terminal, the first body-side claw portion 29a exists on the extension line of the dashed line 52 connecting the center position of the opening of the assembly 21 and the HCLK (B) terminal, and the first body-side claw portion 29a exists on the extension line of the dashed line 53 connecting the center position of the opening of the assembly 21 and the CLK (B) terminal. Therefore, in the attached state, the CLK (B) terminal and the HCLK (B) terminal are pressed against the corresponding lens-side terminals more strongly than the LDET (B) terminal.

[0159] like Figure 6 As shown, the CLK(L) terminal and the HCLK(L) terminal are arranged inside the fan-shaped (angle range of 60) formed by the center position of the opening of the mounting part 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the arc-shaped lens-side first claw 39a. Alternatively, the CLK(L) terminal and the HCLK(L) terminal are arranged inside the triangular area formed by the center position of the opening of the mounting part 31 (i.e., the position of the optical axis O of the interchangeable lens 3) and the two ends of the outer peripheral side of the lens-side first claw 39a. Therefore, although the lens-side first claw 39a does not exist on the extension line of the single-point dashed line 61 connecting the center position of the opening of the mounting part 31 with the LDET(L) terminal, the lens-side first claw 39a exists on the extension line of the single-point dashed line 62 connecting the center position of the opening of the mounting part 31 with the HCLK(L) terminal, and the lens-side first claw 39a exists on the extension line of the single-point dashed line 63 connecting the center position of the opening of the mounting part 31 with the CLK(L) terminal. Thus, in the attached state, the CLK(L) terminal and the HCLK(L) terminal are in stable contact with the corresponding body-side terminal compared to the LDET(L) terminal. In other words, a stronger force pressing the body-side terminal acts on the CLK(L) terminal and the HCLK(L) terminal than on the LDET(L) terminal. Therefore, even if the front ends of the CLK(B) terminal and the HCLK(B) terminal are worn, the clock signal communication between the camera body 2 and the interchangeable lens 3 can be stably performed.

[0160] In addition, in the present embodiment, the CLK (B) terminal, CLK (L) terminal, HCLK (B) terminal, and HCLK (L) terminal are described, but the same is true for the HDATA (B) terminal, HDATA (L) terminal, DATAL (B) terminal, DATAL (L) terminal, DATAB (B) terminal, and DATAB (L) terminal, which are other terminals of the communication system. That is, the HDATA (B) terminal, DATAL (B) terminal, and DATAB (B) terminal are arranged at a position closer to the first claw 29a and the first leaf spring 41a on the body side than the LDET (B) terminal and the VBAT (B) terminal (shorter distance). As a result, the HDATA (B) terminal, DATAL (B) terminal, and DATAB (B) terminal are pressed against the lens side terminal more strongly than the VBAT (B) terminal and the LDET (B) terminal, and can maintain good contact with the lens side terminal. In addition, the HDATA(L) terminal, DATAL(L) terminal, and DATAB(L) terminal are arranged at a position closer to the first lens-side claw 39a (shorter distance) than the LDET(L) terminal and the VBAT(L) terminal. Thus, the HDATA(L) terminal, DATAL(L) terminal, and DATAB(L) terminal are pressed against the body-side terminal more strongly than the VBAT(L) terminal and the LDET(L) terminal, and can maintain good contact with the lens-side terminal.

[0161] The following modifications are possible, and one or more modifications may be combined with the above-described embodiment.

[0162] (Variant 1)

[0163] It is also possible to make any terminal used for command data communication or hotline communication also have the function of sending a power-on signal from the interchangeable lens 3 to the camera body 2. For example, a power switch function is provided in the interchangeable lens 3. Even if the interchangeable lens 3 is in the attached state and the camera system 1 is in the power-off state, the power supply unit 26 supplies power to the lens-side control unit 33 of the interchangeable lens 3 from the V33 (B) terminal. When the power switch of the interchangeable lens 3 is operated, the lens-side control unit 33 outputs a power-on signal to the RDY (L) terminal via the lens-side communication unit 34, for example. When the body-side control unit 23 detects the power-on signal through the RDY (B) terminal via the body-side communication unit 24, the camera system 1 is switched from the power-off state to the power-on state in the same manner as when the power switch (not shown) provided on the camera body 2 is operated.

[0164] (Variant 2)

[0165] In the embodiment, the DATAB(B) terminal is arranged at the front end side of the CLK(B) terminal in the attachment direction, and the DATAL(B) terminal is arranged at the rear end side, but the positions of the DATAB(B) terminal and the DATAL(B) terminal may be reversed. 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 attachment direction.

[0166] In addition, in the above-mentioned embodiment, as an accessory, the interchangeable lens of the camera is used as an example for explanation, but the accessories are not limited to the interchangeable lenses. For example, it can also be a teleconverter, a wide-angle converter, a close-up ring, etc. that are attached between the camera body and the interchangeable lens and change the focal length of the interchangeable lens. Alternatively, it can also be applied to the following assembly adapters, etc.: accessories that can attach interchangeable lenses containing other assembly specifications to the assembly specifications of the above-mentioned camera body. That is, as long as it is an accessory that is attached to the camera body for use, it can be applied in the same way. In this case, the lens side terminal group, the lens side claw portion 39, the lens side communication portion 34, etc. are equivalent to the accessory side terminal group, the accessory side protrusion, the accessory side communication portion, etc. of each accessory.

[0167] In the above-mentioned embodiment, the accessory is configured to be attachable and detachable relative to the camera body, but the above-mentioned camera body may be an assembly adapter capable of attaching the interchangeable lens of the above-mentioned assembly specification to a camera body different from the above-mentioned assembly specification, or may be a structure capable of attaching the above-mentioned accessory to the assembly adapter.

[0168] The present invention is not limited to the above-described embodiment, and the following modified forms are also possible.

[0169] Deformation 1 relates to an accessory that can be attached and detached from a camera body and has a terminal holding portion configured with a plurality of terminals, the accessory having: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal to which a first power is supplied from the camera body; a third terminal used as a ground terminal corresponding to the first power; a fourth terminal to which a second power is supplied from the camera body; a fifth terminal used as a ground terminal corresponding to the second power; a sixth terminal used to indicate whether communication with the camera body is possible; an eighth terminal to which a first clock signal is input from the camera body; and a seventh terminal a terminal to which a first data signal is input from the camera body in synchronization with the first clock signal; a ninth terminal to which a third data signal is output to the camera body in synchronization with the first clock signal; a tenth terminal to which a second clock signal is output to the camera body; and an eleventh terminal to which a second data signal is output to the camera body in synchronization with the second clock signal, wherein three terminals, namely the third terminal, the fourth terminal and the fifth terminal, are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0170] Deformation 2 relates to an accessory that can be loaded and unloaded relative to a camera body and has a terminal holding portion configured with a plurality of terminals, the accessory comprising: a first terminal, which is used to enable the camera body to detect the attachment of the accessory; a second terminal, which is supplied with a first power from the camera body; a third terminal, which is used as a ground terminal corresponding to the first power; a fourth terminal, which is supplied with a second power from the camera body; a fifth terminal, which is used as a ground terminal corresponding to the second power; a sixth terminal, which is used to indicate whether communication with the camera body can be carried out; an eighth terminal, which is input with a first clock signal from the camera body; and a seventh terminal, which is used to A first data signal is input from the camera body in synchronization with the first clock signal; a ninth terminal, which outputs a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal to the camera body; and an eleventh terminal, which outputs a second data signal to the camera body in synchronization with the second clock signal, wherein the second terminal, the third terminal, the fourth terminal, and the fifth terminal as terminals of a power supply system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of a communication system are arranged so as to sandwich the sixth terminal.

[0171] Deformation 3 relates to an accessory. Based on Deformation 2, three terminals, namely the third terminal, the fourth terminal and the fifth terminal, are arranged between the second terminal and the sixth terminal, and three terminals, namely the seventh terminal, the eighth terminal and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

[0172] Variation 4 relates to an accessory according to any one of Variations 1 to 3, wherein the accessory comprises: an optical system including a driven member; and a driving unit that drives the driven member, and the first power is power for driving the driving unit.

[0173] Deformation mode 5 relates to an accessory, based on deformation mode 4, wherein the driven component includes: any one of a component capable of moving along the optical axis direction of the optical system, a component capable of moving in a manner including a component in a direction perpendicular to the optical axis direction, and a component capable of moving in a manner changing the size of an opening through which a light beam passes.

[0174] Deformation 6 relates to an accessory, based on any one of Deformations 1 to 5, wherein the fourth terminal is supplied with a second power from the camera body for performing the following actions: using the seventh terminal to input the first data signal from the camera body in synchronization with the first clock signal input by the eighth terminal, using the ninth terminal to output the third data signal to the camera body, and using the eleventh terminal to output the second data signal to the camera body in synchronization with the second clock signal output by the tenth terminal.

[0175] Variation 7 relates to an accessory according to any one of Variations 1 to 6, wherein the second power is smaller than the first power.

[0176] Modification 8 relates to an accessory according to any one of Modifications 1 to 7, wherein the sixth terminal outputs a signal indicating whether the communication based on the first data signal and the third data signal is possible.

[0177] Variation 9 relates to an accessory, based on any one of variations 1 to 8, wherein the first terminal is arranged next to the second terminal, and the eleventh terminal is arranged next to the tenth terminal.

[0178] Variation 10 relates to an accessory according to any one of Variations 1 to 9, wherein the third terminal is disposed next to the second terminal, and the first terminal is disposed next to the second terminal on the opposite side to the third terminal.

[0179] Variation 11 relates to an accessory, based on any one of variations 1 to 10, wherein the fifth terminal is arranged next to the fourth terminal.

[0180] Deformation 12 relates to an accessory, based on any one of Deformations 1 to 9, wherein the third terminal is arranged next to the second terminal, and the fourth terminal is arranged next to the fifth terminal, in the order of the second terminal, the third terminal, the fourth terminal, and the fifth terminal.

[0181] Variation 13 relates to an accessory according to any one of variations 1 to 12, wherein the ninth terminal is arranged next to the tenth terminal, and the eleventh terminal is arranged next to the tenth terminal on the opposite side to the ninth terminal.

[0182] Variation 14 relates to an accessory according to any one of variations 1 to 13, wherein the seventh terminal is arranged next to the eighth terminal, and the ninth terminal is arranged next to the eighth terminal on the opposite side to the seventh terminal.

[0183] Modification 15 relates to an accessory according to any one of Modifications 1 to 14, wherein the fifth terminal is arranged next to the sixth terminal, and the seventh terminal is arranged next to the sixth terminal on the opposite side to the fifth terminal.

[0184] Deformation 16 relates to an accessory, which is a replacement lens based on any one of Deformations 1 to 15.

Claims

1. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a third terminal serving as a ground potential for the first supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, Three types of terminals, namely, the third terminal, the fourth terminal, and the fifth terminal, are arranged between the second terminal and the sixth terminal. Three types of terminals, namely, the seventh terminal, the eighth terminal, and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

2. An accessory that can be attached to and detached from a camera body and has a plurality of terminals, The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a third terminal serving as a ground potential for the first supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The second terminal, the third terminal, the fourth terminal, and the fifth terminal as terminals of the drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of the communication system are arranged so as to sandwich the sixth terminal.

3. The accessory according to claim 2, Three types of terminals, namely, the third terminal, the fourth terminal, and the fifth terminal, are arranged between the second terminal and the sixth terminal. Three types of terminals, namely, the seventh terminal, the eighth terminal, and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

4. The accessory according to any one of claims 1 to 3, The accessories include: an optical system comprising a driven member; and a driving unit that drives the driven member, The driving unit is driven by the first power supply voltage.

5. The accessory according to claim 4, The driven component comprises: Any one of a member movable along the optical axis direction of the optical system, a member movable so as to include a component in a direction perpendicular to the optical axis direction, and a member movable so as to change the size of an opening through which a light beam passes.

6. The accessory according to any one of claims 1 to 5, The second power supply voltage supplied via the fourth terminal is used to perform the following actions: using the seventh terminal to input the first data signal synchronized with the first clock signal, using the ninth terminal to output the third data signal to the camera body in synchronization with the first clock signal, and using the eleventh terminal to output the second data signal to the camera body in synchronization with the second clock signal.

7. The accessory according to any one of claims 1 to 6, The second power supply voltage is lower than the first power supply voltage.

8. The accessory according to any one of claims 1 to 7, The sixth terminal outputs a signal indicating whether the communication based on the first data signal and the third data signal can be performed.

9. The accessory according to any one of claims 1 to 8, The first terminal is arranged next to the second terminal, The eleventh terminal is arranged beside the tenth terminal.

10. The accessory according to any one of claims 1 to 9, The third terminal is arranged beside the second terminal, The first terminal is arranged next to the second terminal on the side opposite to the third terminal.

11. The accessory according to any one of claims 1 to 10, The fifth terminal is arranged beside the fourth terminal.

12. The accessory according to any one of claims 1 to 9, The third terminal is arranged beside the second terminal, The fourth terminal is arranged next to the fifth terminal, The second terminal, the third terminal, the fourth terminal, and the fifth terminal are arranged in this order.

13. The accessory according to any one of claims 1 to 12, The ninth terminal is arranged next to the tenth terminal, The eleventh terminal is arranged next to the tenth terminal on the side opposite to the ninth terminal.

14. The accessory according to any one of claims 1 to 13, The seventh terminal is arranged beside the eighth terminal, The ninth terminal is arranged next to the eighth terminal on the side opposite to the seventh terminal.

15. The accessory according to any one of claims 1 to 14, The fifth terminal is arranged next to the sixth terminal, The seventh terminal is arranged next to the sixth terminal on the side opposite to the fifth terminal.

16. The accessory according to any one of claims 1 to 15, The first data signal is input via the seventh terminal at a timing different from the first cycle of the first clock signal.

17. The accessory according to any one of claims 1 to 15, The third data signal is output via the ninth terminal at a timing different from the first cycle of the first clock signal.

18. The accessory according to any one of claims 1 to 15, The second data signal is periodically outputted via the eleventh terminal at a timing different from the second cycle of the second clock signal.

19. The accessory according to any one of claims 1 to 18, A period for outputting the second data signal is shorter than a period for inputting the first data signal and outputting the third data signal.

20. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the first power supply voltage and the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, Two types of terminals, a fourth terminal and a fifth terminal, are arranged between the second terminal and the sixth terminal. Three types of terminals, namely, the seventh terminal, the eighth terminal, and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

21. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal to which a power supply voltage is supplied from the camera body; a third terminal serving as a ground potential for the supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The third terminal is arranged between the second terminal and the sixth terminal, Three types of terminals, namely, the seventh terminal, the eighth terminal, and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

22. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the first power supply voltage and the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The second terminal, the fourth terminal, and the fifth terminal as terminals of the drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of the communication system are arranged so as to sandwich the sixth terminal.

23. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal to which a power supply voltage is supplied from the camera body; a third terminal serving as a ground potential for the supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal configured to output a second clock signal having a second period longer than the first period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The second terminal and the third terminal as terminals of the drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of the communication system are arranged so as to sandwich the sixth terminal.

24. The accessory according to any one of claims 20 to 23, The first data signal is input via the seventh terminal at a timing different from the first cycle of the first clock signal.

25. The accessory according to any one of claims 20 to 23, The third data signal is output via the ninth terminal at a timing different from the first cycle of the first clock signal.

26. The accessory according to any one of claims 20 to 23, The second data signal is periodically outputted via the eleventh terminal at a timing different from the second cycle of the second clock signal.

27. The accessory according to any one of claims 20 to 23, A period for outputting the second data signal is shorter than a period for inputting the first data signal and outputting the third data signal.

28. The accessory according to any one of claims 20 to 23, The sixth terminal outputs a signal indicating whether the communication based on the first data signal and the third data signal can be performed.

29. An accessory that can be attached to and detached from a camera body and has a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a third terminal serving as a ground potential for the first power supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, Three types of terminals, namely, the third terminal, the fourth terminal, and the fifth terminal, are arranged between the second terminal and the sixth terminal. Three types of terminals, namely, the seventh terminal, the eighth terminal, and the ninth terminal, are arranged between the sixth terminal and the tenth terminal.

30. An accessory capable of being attached to and detached from a camera body and having a plurality of terminals. The accessories include: a first terminal for enabling the camera body to detect attachment of the accessory; a second terminal supplied with a first power supply voltage from the camera body; a third terminal serving as a ground potential for the first power supply voltage; a fourth terminal to which a second power supply voltage is supplied from the camera body; a fifth terminal serving as a ground potential for the second power supply voltage; a sixth terminal for indicating whether communication with the camera body can be performed; an eighth terminal to which a first clock signal of a first period is input from the camera body; a seventh terminal to which a first data signal synchronized with the first clock signal is input from the camera body; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal, which outputs a second clock signal of a second period to the camera body; as well as an eleventh terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The second terminal, the third terminal, the fourth terminal, and the fifth terminal as terminals of the drive system and the seventh terminal, the eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal as terminals of the communication system are arranged so as to sandwich the sixth terminal.

31. The accessory according to any one of claims 1 to 30, The accessory is a replacement lens that can be installed and removed relative to the camera body.

Images