Accessories

Abstract

The present invention provides an accessory capable of stable communication with a camera body. The accessory is an accessory mounted on a camera body, the camera body having a first clock terminal on the camera side that outputs a first clock signal, a first data terminal on the camera side that outputs a first data signal, and a third data terminal on the camera side that is input with a third data signal, the accessory having an eighth terminal in contact with the first clock terminal on the camera side, a seventh terminal in contact with the first data terminal on the camera side, and a ninth terminal in contact with the third data terminal on the camera side, the eighth terminal being arranged between the seventh terminal and the ninth terminal.

Description

Technical Field

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

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

[0003] Prior art literature

[0004] Patent Document 1: Japanese Patent Application Publication No. 2004-117380 Summary of the invention

[0005] According to the first technical solution, the accessory is an accessory installed on a camera body, the camera body having a first clock terminal on the camera side that outputs a first clock signal, a first data terminal on the camera side that outputs a first data signal, and a third data terminal on the camera side that is input with a third data signal, the accessory having an eighth terminal in contact with the first clock terminal on the camera side, a seventh terminal in contact with the first data terminal on the camera side, and a ninth terminal in contact with the third data terminal on the camera side, and the eighth terminal is arranged between the seventh terminal and the ninth terminal.

[0006] According to the second technical solution, the accessory is an accessory installed on a camera body, the camera body having a second clock terminal on the camera side to which a second clock signal is input, a third data terminal on the camera side to which a third data signal is input, and a second data terminal on the camera side to which a second data signal is input, the accessory having a ninth terminal in contact with the third data terminal on the camera side, a tenth terminal in contact with the second clock terminal on the camera side, and an eleventh terminal in contact with the second data terminal on the camera side, and the tenth terminal is arranged between the ninth terminal and the eleventh terminal.

[0007] According to the third technical solution, the accessory is an accessory installed on a camera body, the camera body having a first clock terminal on the camera side that outputs a first clock signal, a first data terminal on the camera side that outputs a first data signal, a third data terminal on the camera side that is input with a third data signal, a second clock terminal on the camera side that is input with a second clock signal, and a second data terminal on the camera side that is input with a second data signal, the accessory having a seventh terminal in contact with the first data terminal on the camera side, an eighth terminal in contact with the first clock terminal on the camera side, a ninth terminal in contact with the third data terminal on the camera side, a tenth terminal in contact with the second clock terminal on the camera side, and an eleventh terminal in contact with the second data terminal on the camera side, the eighth terminal being arranged between the seventh terminal and the ninth terminal, and the tenth terminal being arranged between the ninth terminal and the eleventh terminal.

[0008] According to the fourth technical solution, the accessory is an accessory installed on the camera body, comprising: a seventh terminal, which inputs the first data signal from the camera body; an eighth terminal, which inputs the first clock signal from the camera body; a ninth terminal, which outputs the third data signal to the camera body; a tenth terminal, which outputs the second clock signal to the camera body; and an eleventh terminal, which outputs the second data signal to the camera body, the eighth terminal being arranged between the seventh terminal and the ninth terminal, and the tenth terminal being arranged between the ninth terminal and the eleventh terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A diagram schematically showing the configuration of a camera system.

[0010] Figure 2 This is a circuit diagram schematically showing the electrical connection between a camera body and an interchangeable lens (interchangeable lens).

[0011] Figure 3 This is a timing chart showing an example of command data communication.

[0012] Figure 4 This is a timing chart showing an example of hot line communication.

[0013] Figure 5 This is a front view schematically showing the mounting (mount, adapter) surface of the camera body as viewed from the interchangeable lens side.

[0014] Figure 6 This is a front view schematically showing the mounting surface of the interchangeable lens as viewed from the camera body side.

[0015] Description of symbols

[0016] 1 Camera system; 2 Camera body; 3 Interchangeable lens; 21 Body-side mounting parts (mount); 22 Body-side terminal retaining part; 31 Lens-side mounting parts; 32 Lens-side terminal retaining part. DETAILED DESCRIPTION

[0017] (First embodiment)

[0018] 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 detached from and attached to the camera body 2 .

[0019] The interchangeable lens 3 includes a lens-side mount 31, a lens-side terminal holding portion 32, a lens-side control portion 33, a lens-side communication portion 34, a lens-side storage portion 35, a photographing (imaging) optical system 36, and a drive portion 37. The lens-side mount 31 and the lens-side terminal holding portion 32 will be described in detail later.

[0020] The lens side control unit 33 is composed of a microcomputer and its peripheral circuits. 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 and the lens side control unit 33. The lens side storage unit 35 is a non-volatile storage medium. The lens side storage unit 35 is connected to the lens side control unit 33. The lens side storage unit 35 pre-stores a predetermined control program executed by the lens side control unit 33. The lens side control unit 33 controls the replacement of the lens 3 by loading the control program from the lens side storage unit 35 and executing the program.

[0021] The photographing optical system 36 forms a subject (photographing object) image on a photographing surface of the later-described imaging element 27. The optical axis O of the photographing optical system 36 substantially coincides with the center positions of the lens side mount 31 and the later-described body side mount 21. 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) through the actuator, etc.

[0022] The camera body 2 has a body-side mounting 21, a body-side terminal holding portion 22, a body-side control portion 23, a body-side communication portion 24, a body-side storage portion 25, a power supply portion 26, an imaging element 27, and a switch 28 for detecting the state of a lock pin described later.

[0023] 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 this disclosure, only the part related to communication is described, 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 and the body-side control unit 23. In addition, a part of the terminals of the body-side terminal holding unit 22 is connected to the body-side control unit 23 as described later. The body-side storage unit 25 is a non-volatile storage medium. The body-side storage unit 25 is connected to the body-side control unit 23. 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 loading the control program from the body-side storage unit 25 and executing the program.

[0024] 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 and / 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.

[0025] 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 a LDET (B) terminal, a VBAT (B) terminal, a PGND (B) terminal, a V33 (B) terminal, a GND (B) terminal, a RDY (B) terminal, a DATAB (B) terminal, a CLK (B) terminal, a DATAL (B) terminal, a HCLK (B) terminal, and a HDATA (B) terminal. The 11 body-side terminals are collectively referred to as a body-side terminal group.

[0026] The LDET (B) terminal is a terminal used for detection of 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. Between the resistor R2 and the body-side control unit 23, a power source V33 supplied from the power supply unit 26 is connected via the resistor R1, and the LDET (B) terminal is pulled up.

[0027] The VBAT (B) terminal, the PGND (B) terminal, the V33 (B) terminal, and the GND (B) terminal are power system terminals 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 used for supplying power to the interchangeable lens 3. The drive unit 37 of the interchangeable lens 3 is driven by the power supplied via the VBAT (B) terminal. Compared with the lens side control unit 33, the operation of the drive unit 37 requires a larger voltage and a larger current, and the maximum voltage applied by the power supply unit 26 to the VBAT (B) terminal is about 10V. In the following description, the voltage applied by the power supply unit 26 to the VBAT (B) terminal is referred to as the drive system voltage. The PGND (B) terminal is a ground terminal corresponding to the VBAT (B) terminal.

[0028] The V33(B) terminal is a terminal used for supplying power to the interchangeable lens 3. The power supplied by the power supply unit 26 via the V33(B) terminal is used to operate the lens side control unit 33 and the like. Compared to the drive unit 37, the lens side control unit 33 and the like operate with a smaller voltage and a smaller current. The maximum voltage applied by the power supply unit 26 to the V33(B) terminal is about 3.3V. In the following description, the voltage applied by the power supply unit 26 to the V33(B) terminal is referred to as the circuit system voltage. The GND(B) terminal is a ground terminal corresponding to the V33(B) terminal.

[0029] The RDY(B) terminal is connected to the body side communication unit 24. The DATAB(B) terminal, CLK(B) terminal, DATAL(B) terminal, HCLK(B) terminal, and HDATA(B) terminal are communication system terminals connected to the body side communication unit 24. The RDY(B) terminal, DATAB(B) terminal, CLK(B) terminal, and DATAL(B) terminal are used for command data communication described later. In addition, the HCLK(B) terminal and HDATA(B) terminal are connected to the body side communication unit 24 and are used for hotline communication described later. Figure 2 In FIG. 1 , arrows are used to indicate the direction of signal flow. The potential of the RDY (B) terminal indicates whether the interchangeable lens 3 can perform command data communication. The DATAB (B) terminal is a terminal for outputting a data signal to the interchangeable lens 3. The CLK (B) terminal is a terminal for outputting a clock signal to the interchangeable lens 3.

[0030] The DATAL (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0031] The HCLK (B) terminal is a terminal to which a clock signal from the interchangeable lens 3 is input. The HDATA (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

[0032] The lens side terminal holding portion 32 includes a LDET (L) terminal, a VBAT (L) terminal, a PGND (L) terminal, a V33 (L) terminal, a GND (L) terminal, a RDY (L) terminal, a DATAB (L) terminal, a CLK (L) terminal, a DATAL (L) terminal, a HCLK (L) terminal, and a HDATA (L) terminal. 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 indicated by the dotted lines in FIG. 1 , the body side terminals are electrically connected to the lens side terminals. Specifically, the LDET (B) terminal is connected to the LDET (L) terminal, the VBAT (B) terminal is connected to the VBAT (L) terminal, the PGND (B) terminal is connected to the PGND (L) terminal, the V33 (B) terminal is connected to the V33 (L) terminal, the GND (B) terminal is connected to the GND (L) terminal, the RDY (B) terminal is connected to the RDY (L) terminal, the DATAB (B) terminal is connected to the DATAB (L) terminal, the CLK (B) terminal is connected to the CLK (L) terminal, the DATAL (B) terminal is connected to the DATAL (L) terminal, the HCLK (B) terminal is connected to the HCLK (L) terminal, and the HDATA (B) terminal is connected to the HDATA (L) terminal. The functions of the lens side terminals are the same as those of the body side terminals they are in contact with, so the description thereof is omitted.

[0033] The LDET (L) terminal is grounded via a resistor R3. When the LDET (L) terminal contacts the LDET (B), the potential of the LDET (B) terminal is pulled down. The VBAT (L) terminal and the PGND (L) terminal are connected to the drive unit 37. A so-called bypass capacitor C1 is connected between the VBAT (L) terminal and the PGND (L) terminal. The V33 (L) terminal and the GND (L) terminal are connected to various parts such as the lens side control unit 33. A bypass capacitor C2 is connected between the V33 (L) terminal and the GND (L) terminal. The RDY (L) terminal, the DATAB (L) terminal, the CLK (L) terminal, the DATAL (L) terminal, the HCLK (L) terminal, and the HDATA (L) terminal are respectively connected to the lens side communication unit 34.

[0034] (Description of command data communication)

[0035] The following communication is called command data communication: after the control instruction (command) from the body side control unit 23 is sent to the lens side control unit 33 of the interchangeable lens 3, the control content (control data) from the body side control unit 23 and the response content (response data) from the lens side control unit 33 are sent and received in parallel. The command data communication is full-duplex communication. The command data communication is performed through the body side communication unit 24 and the lens side communication unit 34 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.

[0036] The body-side control unit 23 sends various control instructions and control contents to the interchangeable lens 3 through the body-side communication unit 24 and the lens-side communication unit 34 by command data communication, and receives response contents from the interchangeable lens 3, thereby sending and receiving various information between the interchangeable lens 3. The control instructions mentioned here refer to, for example, instructions for sending lens information. The various information received from the interchangeable lens 3 refer to, for example, information on the model (type) 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 sent to the interchangeable lens 3 refer to, for example, control contents such as the drive amount of the lens and / or model information of the camera body 2. In addition, the control instructions also include drive instructions for the focus lens 36b, and the like. The lens-side control unit 33 receives various control instructions from the body-side control unit 23 through command data communication, obtains various information from the body-side control unit 23, and sends various information to the body-side control unit 23.

[0037] Figure 3 1 is an example of a time chart showing the timing of command data communication. When the 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 the lens side control unit 33 can perform command data communication. When the command data communication is not possible, the lens side control unit 33 sets the signal level (potential) of the RDY (L) terminal to a high level (H level). When the command data communication is possible, the lens side control unit 33 sets the signal level (potential) of the RDY (L) terminal to a low level (L level) via the lens side communication unit 34.

[0038] 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 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 clock signal 401 to the lens side control unit 33 via the CLK (B) terminal and the CLK (L) terminal. Figure 3The frequency of the repeated high level and low level of the clock signal 401 is, for example, 8 MHz. The body-side control unit 23 outputs a body-side command signal 402 as a control instruction from the DATAB (B) terminal in synchronization with the 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 indicated by the switching between the high level and the low level of DATAB is a signal indicating control instructed by the body-side control unit 23 to the lens-side control unit 33 through command data communication. For example, the body-side command signal 402 is a signal indicating model information requesting replacement of the lens 3 and / or a signal indicating an instruction to drive the focus lens 36b.

[0039] When the lens-side control unit 33 receives the body-side command signal 402 via the lens-side communication unit 34, it performs a check process to check whether the body-side command signal 402 has a communication error using an error detection code (e.g., check 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 a high level, the body-side control unit 23 does not transmit the body-side command signal 402.

[0040] The lens-side control unit 33 starts the first control process 404 based on the instruction of the received body-side command signal 402 .

[0041] 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 becomes a low level, the body-side control unit 23 outputs a clock signal 405 from the CLK (B) terminal. That is, the body-side control unit 23 transmits the clock signal 405 to the lens-side control unit 33 via the CLK (B) terminal and the CLK (L) terminal.

[0042] 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 .

[0043] The body-side control section 23 outputs the body-side data signal 406 from the DATAB (B) terminal via the body-side communication section 24 in synchronization with the clock signal 405. That is, the body-side control section 23 transmits 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.

[0044] When the clock signal 405 is input to the CLK (L) terminal, the lens-side control unit 33 outputs a lens-side data signal 407 from the DATAL (L) terminal in synchronization with the clock signal 405 . Figure 3 The lens side data signal 407 indicated by the switching between the high level and the low level of DATAL is a signal sent from 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.

[0045] When the transmission of the lens side data signal 407 is completed, the lens side control unit 33 sets the signal level of the RDY (L) terminal to the high level again (T4). 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).

[0046] 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 in the first control process 404 is transmitted to the body side control unit 23 via the lens side communication unit 34, the DATAL (L) terminal, the DATAL (B) terminal, and the body side communication unit 24.

[0047] For example, the case where the received body-side command signal 402 is a signal indicating an instruction to drive the focus lens 36b will be described. As the first control process 404, the lens-side control unit 33 performs a process of generating a signal indicating that a signal indicating an instruction to drive the focus lens 36b has been received. The signal generated in the first control process 404 is transmitted to the body-side control unit 23 as a lens-side data signal 407 via the lens-side communication unit 34, the DATAL (L) terminal, the DATAL (B) terminal, and the body-side communication unit 24. As the second control process 408, the lens-side control unit 33 performs a process of driving the focus lens 36b by the drive amount specified by the body-side data signal 406.

[0048] 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 ).

[0049] The communication performed at the timings T1 to T5 described above is one command data communication. In one command data communication, the body side command signal 402 and the body side data signal 406 are transmitted by the body side control unit 23. That is, the body side command signal 402 and the body side data signal 406 together constitute one control data.

[0050] As described above, the lens-side control unit 33 concurrently receives control data from the body-side control unit 23 and transmits response data to the body-side communication unit 24. That is, the command data communication is a so-called full-duplex communication.

[0051] (Instructions for hotline communication)

[0052] As another communication system, there is a communication in which data is sent from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2 in one direction, and this is called hotline communication. Hotline communication is data communication performed between the body-side control unit 23 and the lens-side control unit 33 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 refers to, for example, the position of the focus lens 36b and / or the position of the shake correction lens (not shown), the position of the diaphragm, and the like. The shake correction lens is a component that can be moved (driven) so as to include a component in a direction perpendicular to the optical axis direction, and the diaphragm is a component that can be moved (driven) so as to change the size of the opening through which the light beam passes. This hotline communication is the following communication: 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.

[0053] Figure 4 : is an example of a time chart showing the timing of hotline communication. When the lens-side control unit 33 receives a command to start hotline communication from the body-side control unit 23 of the camera body through command data communication (T6), it performs generation processing 501. Generation processing 501 is a process of acquiring the state of the lens with a sampling period of 1 millisecond, for example, and generating a lens signal 503 for hotline communication. When the generation of the lens signal 503 is completed (T7), the lens-side control unit 33 outputs a clock signal 502 from the HCLK (L) terminal via the lens-side communication unit 34. That is, the clock signal 502 is sent to the body-side control unit 23 via the HCLK (L) terminal and the HCLK (B) terminal. Figure 4 The frequency of the repetition of high level and low level of the clock signal 502 is, for example, 8 MHz to 20 MHz. That is, the frequency of the clock signal 502 for hotline communication is about the same as or higher than the frequency of the clock signal 401 for command data communication.

[0054] The lens side control unit 33 outputs the lens signal 503 (for example, information on the position of the focus lens 36b) generated in the generation process 501 from the HDATA (L) terminal via the lens side communication unit 34 in synchronization with the clock signal 502. That is, the lens side control unit 33 transmits the lens signal 503 to the body side control unit 23 via the lens side communication unit 34, the HDATA (L) terminal, the HDATA (B) terminal, and the body side communication unit 24. Figure 4The lens signal 503 indicated by the switching between the high level and the low level of HDATA is a signal transmitted from the lens side control unit 33 to the body side control unit 23 via the hotline communication. The output of the clock signal 502 and the lens signal 503 ends at the timing T8.

[0055] The lens-side control unit 33 repeats the transmission of the lens data by hotline communication at regular intervals (for example, 1 millisecond) until receiving an instruction to stop the transmission of the lens signal 503 by command data communication.

[0056] The command data communication and the hotline communication can be executed in part or in whole in parallel. That is, the body side control unit 23 and the lens side control unit 33 can start or end the hotline communication when the command data communication is performed. In addition, the command data communication can also be started or ended when the hotline communication is performed.

[0057] As described above, the hotline communication is performed independently of the command communication. The lens-side control unit 33 transmits information on the state of the interchangeable lens 3 to the body-side control unit 23 via the hotline communication independently of the command communication. Thus, the body-side control unit 23 can continue to grasp the state of the interchangeable lens 3 even during the command communication. Therefore, the body-side control unit 23 can continue to grasp the position of the focus lens 36b, so that, for example, the auto focus can be controlled at high speed. The same is true for the shake correction control and / or the diaphragm control.

[0058] 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 by command communication at any timing.

[0059] (Description of lens assembly mechanism)

[0060] The camera system 1 of this embodiment has a so-called bayonet-type lens mounting mechanism. The body-side mount 21 of the camera body 2 and the lens-side mount 31 of the interchangeable lens 3 will be described below in order.

[0061] 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 21 and the body side terminal holding portion 22 are described above. The body side assembly 21 has a circular reference surface with a certain width. Furthermore, the body side assembly 21 has a first body side claw portion 29a, a second body side claw portion 29b, a third body side claw portion 29c, and a fourth body side claw portion 29d. In the following description, the above four claw portions are collectively referred to as the body side claw portion 29.

[0062] 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.

[0063] The lengths of the first to fourth body claws 29a to 29d in the circumferential direction are different. 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.

[0064] 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, a 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 a first body side plug-in portion 40a. Similarly, a space 40b between the first body side claw portion 29a and the second body side claw portion 29b is referred to as a second body side plug-in portion 40b, a space 40c between the second body side claw portion 29b and the third body side claw portion 29c is referred to as a third body side plug-in portion 40c, and a space 40d between the third body side claw portion 29c and the fourth body side claw portion 29d is referred to as a fourth body side plug-in portion 40d. The four body side plugging and unplugging portions are collectively referred to as a body side plugging and unplugging portion 40 .

[0065] A body side terminal holding portion 22 is provided inside the opening of the body side mounting part 21. The body side terminal holding portion 22 has an arc shape corresponding to the shape of the annular body side mounting part 21. The body side terminal holding portion 22 is arranged in parallel with the opening of the body side mounting part 21 at the upper part of the opening of the body side mounting part 21, preferably as shown in FIG. Figure 5 As shown in (a) of FIG. 2 , the body side terminal holding portion 22 has a plurality of body side terminals. In the body side terminal holding portion 22 , the plurality of body side terminals are arranged in a row on the inner side of the body side assembly 21 and are arranged in an arc shape. Figure 5 As shown in (a), the plurality of body side terminals are arranged from the right to the left, namely HDATA (B), HCLK (B), DATAL (B), CLK (B), DATAB (B), RDY (B), GND (B), V33 (B), PGND (B), VBAT (B), LDET (B). Each terminal of the body side terminal group is a conductive pin. The body side terminal group is pushed in the -Z direction ( Figure 1). The -Z direction refers to the direction toward the interchangeable lens 3 attached to the camera, which is the direction of the subject.

[0066] 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 29d. That is, on 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 29d is located and the area where the body side first claw 29a is located. The lock pin 42 is pushed in the -Z direction ( Figure 1 ).

[0067] Figure 5 (b) is a schematic diagram of the assembly of the camera body 2 with the body-side assembly 21 removed, as viewed from the interchangeable lens 3 side. A first leaf spring 41a is provided at a position corresponding to the first body-side claw 29a (back side of the first body-side claw 29a). Similarly, a second leaf spring 41b is provided at a position corresponding to the second body-side claw 29b (back side of the second body-side claw 29b), a third leaf spring 41c is provided at a position corresponding to the third body-side claw 29c (back side of the third body-side claw 29c), and a fourth leaf spring 41d is provided at a position corresponding to the fourth body-side claw 29d (back side of the fourth body-side claw 29d). In the following description, the above 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 (camera body 2 side).

[0068] Figure 6 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 are mentioned above. The lens side mounting part 31 has an annular reference surface with a certain width. When the interchangeable lens 3 is attached to the camera body 2, the annular reference surface of the lens side mounting part 31 contacts the annular reference surface of the body side mounting part 21 mentioned above. Furthermore, the lens side mounting part 31 has a cylindrical part extending along the optical axis 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, the above four claw parts are collectively referred to as the lens side claw part 39.

[0069] The lens-side claw portion 39 is provided in a direction protruding from the outer periphery of the cylindrical portion of the lens-side mount 31 toward the outside of the mount (in a direction radiating from the optical axis O). Figure 6As shown 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 back side of the lens side claw 39 (the reference surface side of the lens side mounting member 31) for accommodating the corresponding body side claw 29 when the interchangeable lens 3 is attached to the camera body 2.

[0070] 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 6 As shown in the figure, the lens side terminal holding portion 32 is arranged in the center of the upper portion. As described above, the lens side terminal holding portion 32 has a plurality of lens side terminals. In the lens side terminal holding portion 32, the plurality of lens side terminals are arranged in a row on the inner side of the lens side mounting member 31 and are arranged in an arc shape. Figure 6 As shown, the multiple lens side terminals are configured as 11 terminals from the right, namely LDET (L), VBAT (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), HCLK (L), and HDATA (L). The lens side terminal group is configured so that the conductive contact surface faces the +Z direction ( Figure 1 The +Z direction refers to the direction in which the subject light passing through the photographing optical system 36 is directed toward the photographing element 27.

[0071] 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 accommodating 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 ) and set.

[0072] 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.

[0073] (Accessory for interchangeable lenses)

[0074] A 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 positioned at the position of the first body-side plug-in portion 40a, the second lens-side claw portion 39b is positioned at the position of the second body-side plug-in portion 40b, the third lens-side claw portion 39c is positioned at the position of the third body-side plug-in portion 40c, and the fourth lens-side claw portion 39d is positioned at 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.

[0075] From this state, the interchangeable lens 3 is moved along Figure 5 as well as Figure 6 In other words, the first claw 29a on the body side enters the space on the back side of the first claw 39a on the lens side, the second claw 29b on the body side enters the space on the back side of the second claw 39b on the lens side, the third claw 29c on the body side enters the space on the back side of the third claw 39c on the lens side, and the fourth claw 29d on the body side enters the space on the back side of the fourth claw 39d on the lens side. At this time, the plurality of lens side terminals contact the plurality of body side terminals in sequence. In addition, instead of the interchangeable lens 3, the camera body 2 may be moved in a direction parallel to the interchangeable lens 3. Figure 5 as well as Figure 6 The attachment direction 44 is shown as rotating in the opposite direction.

[0076] When the lens side claws 39 are inserted into the corresponding body side plug-in and unplug parts 40 and rotated in the attachment direction 44, for example, the LDET (L) terminal sequentially contacts the CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, VBAT (B) terminal, and LDET (B) terminal. For example, the VBAT (L) terminal sequentially contacts the DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, and VBAT (B) terminal. For example, the PGND (L) terminal sequentially contacts the HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B) terminal, and PGND (B) terminal. For example, the V33 (L) terminal sequentially contacts the HDATA (B) 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.

[0077] 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.

[0078] The interchangeable lens 3 is rotated relative to the camera body 2 by a predetermined angle to reach the attachment completion position. In the attachment completion position, the corresponding body side claws 29 and lens side claws 39 are opposite to the optical axis direction, and the lock pin 42 is moved along the Figure 1The lock pin 42 is pushed in the -Z direction and enters the lock pin receiving portion 43. When the lock pin 42 enters the lock pin receiving portion 43, the interchangeable lens 3 cannot be rotated relative to the camera body 2 for removal. In other words, when the body side claw portion 29 and the lens side claw portion 39 reach the predetermined attachment completion position, the relative position of the body side mounting part 21 and the lens side mounting part 31 is fixed. The lens side claw portion 39 is pushed to the body side ( Figure 1 Thus, each of the plurality of lens-side terminals is in contact with and electrically connected to each of the corresponding plurality of body-side terminals.

[0079] 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 inserted into the body-side insertion and removal portion 40 to the halfway point just before the attachment completion position, or the state in which the lens-side claw portion 39 is rotated from the halfway point just before the attachment completion position to the halfway point of the insertion position is referred to as the attachment mid-state.

[0080] 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 allow the power supply unit 26 to supply power to the VBAT (B) terminal and the V33 (B) terminal.

[0081] When the attachment is completed, as described above ( Figure 2 ), the signal level of the LDET (B) terminal is pulled down to a low level. When the body-side control unit 23 detects that the signal level of the LDET (B) terminal has become a low level, it determines that the interchangeable lens 3 is attached. In addition, 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 the body-side control unit 23 detects that the signal level of the LDET (B) terminal has become low and the switch 28 has been turned on, the power supply unit 26 starts supplying power to the V33 (B) terminal. In addition, the camera body 2 does not necessarily need to include the switch 28. In the absence of the switch 28, the power supply unit 26 only needs to start supplying power to the V33 (B) terminal at the time when the signal level of the LDET (B) terminal is detected to have become low.

[0082] When the power supply to the V33 (B) terminal starts, the power is supplied to the lens-side control unit 33 of the interchangeable lens 3 through the V33 (L) terminal, and the lens-side control unit 33 starts to operate. The lens-side control unit 33 that has started to operate allows the initial communication based on the command data communication with 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 for the lens-side control unit 33 to request the power supply to the VBAT (L) terminal. When the signal for requesting the power supply to the VBAT (L) terminal is transmitted from the lens-side control unit 33 to the body-side control unit 23, the body-side control unit 23 supplies power to the VBAT (B) terminal, and 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 shooting operation and / or the focusing 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.

[0083] When the attachment is completed, if the user presses the unlock button (not shown) of the camera body, the lock pin 42 will be retracted from the lock pin receiving portion 43. As a result, the relative position of the body-side mounting part 21 and the lens-side mounting part 31 can be changed. If the user presses the unlock button (not shown), the switch 28 linked to the unlock button is turned off (OFF), and the body-side control unit 23 stops the power supply unit 26 from supplying power to the VBAT (B) terminal and the V33 (B) terminal. From this state, if the interchangeable lens 3 is moved along the same direction as the interchangeable lens 3, the interchangeable lens 31 will be moved. Figure 5 as well as Figure 6 If the lens is rotated in the direction opposite to the attachment direction 44 shown, the plurality of lens-side terminals will contact the plurality of body-side terminals in the reverse order to that described above.

[0084] In addition, the power supply may be stopped without being linked to the operation of the unlock button. In this case, when the body-side control unit 23 detects that the LDET (L) terminal and the LDET (B) terminal are separated due to the rotation of the interchangeable lens 3 in the direction opposite to the attachment direction 44 and the signal level of the LDET (B) terminal changes from a low level to a high level, the power supply unit 26 stops the power supply 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, when both the unlock button is pressed and the signal level of the LDET (B) terminal changes from a low level to a high level are detected, the power supply unit 26 stops the power supply to the VBAT (B) terminal and the V33 (B) terminal. Alternatively, when either the unlock button is pressed or the signal level of the LDET (B) terminal changes from a low level to a high level is detected, the body-side control unit 23 stops the power supply to the VBAT (B) terminal and the V33 (B) terminal.

[0085] As described above, during the process of attaching the interchangeable lens to the camera body and during the process of removing the interchangeable lens from the camera body (attachment process), the lens side terminal may contact the body side terminal other than the terminal that should be in contact when the attachment is completed. Regarding the arrangement of the lens side terminal and the body side terminal, it is preferred to arrange the lens side terminal and the body side terminal in such a way that the occurrence of malfunctions (failures) due to the contact during the attachment process and the removal process is reduced.

[0086] (Terminal arrangement considering noise)

[0087] In this embodiment, the LDET (B) terminal among the plurality of body-side terminals is arranged in the lens attachment direction ( Figure 5 The front end of the arrow 44 in (a). That is, the configuration position of the LDET (B) terminal is as described above. Figure 5 The LDET (L) terminal among the multiple lens-side terminals is also arranged in the same way in the lens attachment direction ( Figure 6 The front end of the arrow 44). That is, the configuration position of the LDET (L) terminal is as described above. Figure 6 Therefore, until the attachment of the interchangeable lens is completed, the LDET (B) terminal does not contact the lens side terminals other than the LDET (L) terminal. Therefore, during the attachment of the interchangeable lens, the signal level of the LDET (B) terminal does not erroneously become a low level, and the lens attachment is not erroneously recognized.

[0088] In the present embodiment, the VBAT (B) terminal is arranged next to the LDET (B) terminal, that is, the second position from the front end in the attachment direction. The VBAT (L) terminal is arranged next to the LDET (L) terminal, that is, the second position from the front end in the attachment direction. This is to reduce the number of terminals on the lens side that are contacted by the VBAT (B) terminal on the camera body side during the lens attachment process. Since the voltage applied to the VBAT (B) terminal is a high voltage higher than other terminals, if the VBAT (B) terminal contacts terminals other than the VBAT (L) terminal when a high voltage is mistakenly applied to the VBAT (B) terminal due to a malfunction of the camera system 1, the high voltage may cause an unexpected burden on the electrical circuit in the interchangeable lens. In the present embodiment, the VBAT (B) terminal is located next to the LDET (B) terminal, so that when the interchangeable lens 3 is attached, only the LDET (L) terminal among the multiple lens-side terminals contacts the VBAT (B) terminal. 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.

[0089] In the present embodiment, the PGND(B) terminal is arranged next to the VBAT(B) terminal, that is, 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, the third position from the front end in the attachment direction. The high voltage charge supplied from the VBAT(B) terminal is accumulated 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 immediately discharged from the PGND(B) terminal, which is the ground terminal, and does not affect other circuits of the camera system 1.

[0090] In the present embodiment, the 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 the GND(B) terminal is arranged next to it, i.e., at the fifth position from the front end. The 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 the GND(L) terminal is arranged next to it, i.e., at the fifth position from the front end. The capacitor C2 connected to the V33(L) terminal accumulates a charge of the voltage supplied from the V33(B) 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 immediately discharged from the GND(B) terminal, which is the ground terminal, and does not affect other circuits of the camera system 1.

[0091] The RDY(B) terminal is configured next to the GND(B) terminal, i.e., the sixth bit from the front end, the DATAB(B) terminal is configured next to it, i.e., the seventh bit from the front end, the CLK(B) terminal is configured next to it, i.e., the eighth bit from the front end, the DATAL(B) terminal is configured next to it, i.e., the ninth bit from the front end, the HCLK(B) terminal is configured next to it, i.e., the tenth bit from the front end, and the HDATA(B) terminal is configured next to it, i.e., the end.

[0092] The RDY(L) terminal is configured next to the GND(L) terminal, i.e., the sixth bit from the front end, the DATAB(L) terminal is configured next to it, i.e., the seventh bit from the front end, the CLK(L) terminal is configured next to it, i.e., the eighth bit from the front end, the DATAL(L) terminal is configured next to it, i.e., the ninth bit from the front end, the HCLK(L) terminal is configured next to it, i.e., the tenth bit from the front end, and the HDATA(L) terminal is configured next to it, i.e., at the very end.

[0093] 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 unilaterally sends information to the body after the communication starts, and is performed at a high frequency (repeatedly in an extremely short cycle). During hotline communication, a clock signal is sent from the HCLK (L) terminal to the HCLK (B) terminal. The clock signal is a signal that repeats high and low levels in a short cycle, so it may become a large noise source for other signals. Furthermore, the clock signal sent from the HCLK (L) terminal to the HCLK (B) terminal is a signal output from the interchangeable lens 3, so even if noise is mistakenly added to the clock signal, the camera body 2 side cannot recognize the noise. In this way, the signal flowing through the HCLK terminal may also become a noise source for the camera body 2, causing it to become a cause of malfunction of the camera system 1. As examples of malfunction, erroneous detection of the attachment of the interchangeable lens and / or misunderstanding of whether command communication can be performed can be listed. In this 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 and the RDY terminal used to indicate whether command communication is possible are arranged separately so as not to be adjacent to each other.

[0094] In addition, the HDATA terminal and the DATAL terminal are arranged on the left and right sides of the HCLK terminal. This can suppress the influence of the noise of the HCLK terminal on other terminals other than the HDATA terminal and the DATAL terminal.

[0095] Next, as described above, command data communication is a communication that sends and receives information in both directions between the body and the interchangeable lens. During command data communication, a clock signal is sent from the CLK (B) terminal to the CLK (L) terminal. The clock signal sent through the CLK terminal may also become a noise source for the same reason as mentioned above. Therefore, in this embodiment, the CLK terminal is configured at a position away from the VBAT terminal to which a high voltage is applied. In addition, the CLK terminal is configured separately from the RDY terminal used to indicate whether command communication can be performed so that they are not adjacent. In addition, if the HCLK terminal is adjacent to the CLK terminal, the clock signal on one side may affect the clock signal on the other side and may become a noise source. In this embodiment, a DATAL terminal is configured between the CLK terminal and the HCLK terminal. In addition, a DATAB terminal is configured between the CLK terminal and the RDY terminal. That is, the DATAL terminal and the DATAB terminal are configured on both sides of the CLK terminal. Because of this, the influence of the noise caused by the CLK terminal on the camera system can be suppressed.

[0096] In addition, as described above, the level of the RDY terminal must be determined for command data communication. That is, the signal level of the RDY terminal indicates whether the command data can be communicated, so the noise has a great influence on the shooting operation. Here, consider a case where the body-side control unit 23 mistakenly recognizes that the communication is possible due to noise even though the command data cannot be communicated. In this case, the lens-side control unit 33 cannot receive the command data, but the body-side control unit 23 sends the command data, and the body-side control unit 23 mistakenly recognizes that the control will be performed in accordance with the command data in the exchange lens. However, the lens-side control unit 33 does not receive the command data, and thus does not perform the control in accordance with the command data sent by mistake. Therefore, the operation of the camera system 1 will be hindered. For this reason, it is necessary to prevent noise from being added to the signal of the RDY terminal. In order to prevent noise from being added to the signal of the RDY terminal, it is preferable to configure terminals on the left and right sides of the RDY terminal to pass a relatively stable signal, that is, a signal whose signal level changes less per unit time. In this embodiment, the GND terminal and the DATAB terminal are configured on the left and right sides of the RDY terminal. The GND terminal is a terminal of ground potential and therefore stable, and the DATAB terminal is also a terminal through which a relatively stable signal flows compared to the CLK terminal and / or the HCLK terminal. Thus, the influence of noise on the signal of the RDY terminal can be suppressed.

[0097] Next, the power supplied from the VBAT (B) terminal to the VBAT (L) terminal is used to drive the actuator (such as a stepping motor, etc.) of the drive unit 37 of the interchangeable lens 3. Therefore, the current flowing through the VBAT terminal undergoes a large change when the actuator is driven and when it is not driven. This change in current becomes a noise source for the signal flowing through other terminals. In the present embodiment, the VBAT terminal is arranged at a position away from the RDY terminal, DATAB terminal, CLK terminal, DATAL terminal used for command data communication, and the HCLK terminal and HDATA terminal used for hotline communication. Furthermore, a GND terminal, a V33 terminal, and a PGND terminal are arranged between the VBAT terminal and the terminals used for these communications. Thus, the influence of the noise caused by the change in the current flowing through the VBAT terminal on the data communication can be suppressed.

[0098] The terminal configurations in consideration of noise described above are summarized here.

[0099] The RDY terminal is arranged separately from the VBAT terminal and the HCLK terminal, which are noise sources, so as not to be adjacent to each other. This can suppress the influence of noise on the RDY terminal used to indicate whether command communication is possible.

[0100] The HCLK terminal, which is a noise source, is placed between the HDATA terminal and the DATAL terminal, and the CLK terminal is placed 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 arranged in order 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.

[0101] Furthermore, considering the influence of noise, the terminal group for power supply and the terminal group for communication are configured separately across the RDY terminal. Specifically, across the RDY terminal, the VBAT terminal, PGND terminal, V33 terminal, and GND terminal as terminals for power supply are sequentially configured from the front end side on the front end side of the attachment direction, and the DATAB terminal, CLK terminal, DATAL terminal, HCLK terminal, and HDATA terminal as terminals for communication are sequentially configured from the front end side on the rear end side of the attachment direction. In this way, the influence of noise on the RDY terminal from the power supply system terminal group such as the VBAT terminal and the communication terminal group such as the HCLK terminal and CLK terminal can be suppressed.

[0102] The HCLK terminal for transmitting the clock signal used in the hotline communication and the CLK terminal for transmitting the clock signal used in the command data communication are arranged at a position farther from the VBAT terminal than the CLK terminal. The reason for this is that the clock signal transmitted from the CLK terminal to the interchangeable lens is outputted by the body-side control unit 23 via the body-side communication unit 24, and if noise is added to the 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 may misrecognize it, and therefore the noise of the clock signal added to the HCLK terminal has a greater impact on the camera system 1.

[0103] Regarding the HCLK terminal and the GND terminal, the HCLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. Thus, the noise caused by the VBAT terminal to the HCLK terminal that transmits the clock signal used in the hotline communication can be shielded.

[0104] Regarding 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, a PGND terminal is arranged between the GND terminal and the VBAT terminal. Thus, the noise caused by the VBAT terminal to the CLK terminal that sends the clock signal used in the command data communication can be shielded.

[0105] (Terminal configuration considering wear)

[0106] Hereinafter, the contact of each terminal when attaching or detaching the camera body 2 and replacing the lens 3 will be described.

[0107] When the interchangeable lens 3 is mounted on the camera body 2, the body-side terminals and the lens-side terminals come into contact one by one. The same is true when the interchangeable lens 3 is removed from the camera body 2. That is, the pins protruding from the body-side terminal retaining portion 22, i.e., the body-side terminals, are rubbed against the exposed conductive contact surface, i.e., the lens-side terminals, one by one. Since multiple interchangeable lenses are mounted and dismounted from one camera body, the body-side terminals are more susceptible to wear than the lens-side terminals. In particular, the body-side terminals located at the rear end side of the attachment direction of the interchangeable lens 3 rub against more lens-side terminals and generate more friction. Therefore, the front end of the pins of the body terminals located at the rear end side are more susceptible to wear than those of the body-side terminals located at the front end side. The wear of the body-side terminals affects the contact with the lens-side terminals, so data communication may become unstable.

[0108] In this embodiment, the LDET (B) terminal is arranged at the front end in the attachment direction, so 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 erroneously detecting the disassembly of the interchangeable lens 3 is small.

[0109] As mentioned 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, the CLK (B) terminal and the HCLK (B) terminal are more worn than the LDET (B) terminal and the VBAT (B) terminal. In this embodiment, the CLK (B) terminal and the HCLK (B) terminal are arranged next to 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 periphery 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-side claw 29a is shorter than the distance between 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 shorter than the distance between 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 back side of the first body-side claw 29a, and the first leaf spring 41a is used to move the first lens-side claw 39a in the +Z direction ( Figure 1) is pressed. 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 also shorter than the distance between the VBAT(B) terminal and the first leaf spring 41a. In addition, the LDET(B) terminal is also similar to the VBAT(B) terminal, and the distance between the CLK(B) terminal and the first leaf spring 41a and the distance between the HCLK(B) terminal and the first leaf spring 41a are both shorter than the distance between the LDET(B) terminal and the first leaf spring 41a. For this reason, the CLK(B) terminal and the HCLK(B) terminal are pressed against the lens side terminal more strongly than the VBAT(B) terminal and the LDET(B) terminal.

[0110] 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 shorter than the distance between the VBAT (L) terminal and the inner periphery of the first claw portion 39a on the lens side, and the distance between the HCLK (L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the VBAT (L) terminal and the inner periphery of the first claw portion 39a on the lens side. Therefore, 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 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 CLK (L) terminal and the HCLK (L) terminal are pressed against the body side terminal with a stronger force than the LDET (L) terminal. As a result, even if the CLK (B) terminal and / or the HCLK (B) terminal are worn, good contact can be maintained, and the clock signal is stable, and stable data communication is 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 contact between the CLK (B) terminal and the CLK (L) terminal and the contact between the HCLK (B) terminal and the HCLK (L) terminal remain unchanged.

[0111] Even if a portion of the first claw portion 39a on the lens side is grooved, the entirety of the protrusion disposed in the area opposite to the first claw portion 29a on the body side and the grooved portion is set as the first claw portion on the lens side. As a method of groove, the lens side claw portion may be grooved in a manner of dividing it into two or more in the circumferential direction, or in a manner of cutting off a portion of the lens side claw portion, or in a manner of shortening the radial length of at least a portion of the lens side claw portion. In addition, the circumferential length of the lens side claw portion may 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 may be appropriately changed, and may be a shape in which at least a portion of the cylindrical portion of the present embodiment protrudes inward.

[0112] 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 this embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged next to the first claw 29a on the body side. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged closer to the inner periphery of the first claw 29a on the body side than the LDET(B) terminal and / or the VBAT(B) terminal. In other words, the distance between the CLK (B) terminal and the inner periphery of the first claw portion 29a on the body side is shorter than the distance between the LDET (B) terminal and / or the VBAT (B) terminal and the inner periphery of the first claw portion 29a on the body side, and the distance between the HCLK (B) terminal and the inner periphery of the first claw portion 29a on the body side is shorter than the distance between the LDET (B) terminal and / or the VBAT (B) terminal and the inner periphery of the first claw portion 29a on the body side. As described above, the first leaf spring 41a is provided on the back 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 39a on the lens side in the +Z direction ( Figure 1 From the perspective of the first leaf spring 41a, the distance between the CLK(B) terminal and the first leaf spring 41a and the distance between the HCLK(B) terminal and the first leaf spring 41a are also shorter than the distance between the LDET(B) terminal and / or the VBAT(B) terminal and the first leaf spring 41a.

[0113] 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 LDET(L) terminal and / or the VBAT(L) terminal. In other words, the distance between the CLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the LDET(L) terminal and / or the VBAT(L) terminal and the inner periphery of the first claw portion 39a on the lens side, and the distance between the HCLK(L) terminal and the inner periphery of the first claw portion 39a on the lens side is shorter than the distance between the LDET(L) terminal and / or 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. Because of this, the CLK (B) terminal and the HCLK (B) terminal are pressed against the lens side terminal more strongly than the LDET (B) terminal and / or the VBAT (B) terminal. Therefore, even if the CLK (B) terminal and / or 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 the camera body 2 and / or the interchangeable lens 3 are still attached, the contact between the CLK (B) terminal and the HCLK (B) terminal and the lens side terminal is maintained.

[0114] In the present embodiment, the CLK(B) terminal and the HCLK(B) terminal are also close to the fourth claw 29d on the body side. That is, the CLK(B) terminal and the HCLK(B) terminal are arranged at a position closer to the fourth claw 29d on the body side than the VBAT(B) terminal and / or the LDET(B) terminal. In other words, the distance between the CLK(B) terminal and the fourth claw 29d on the body side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw 29d on the body side, and the distance between the HCLK(B) terminal and the fourth claw 29d on the body side is shorter than the distance between the VBAT(B) terminal or the LDET(B) terminal and the fourth claw 29d on the body side. As described above, there is a fourth leaf spring 41d on the back side of the fourth claw 29d on the body side, and the fourth leaf spring 41d is used to move the fourth claw 39d on the lens side along the +Z direction ( Figure 1 Therefore, the CLK (B) terminal and the HCLK (B) terminal located near the fourth claw portion 39d on the lens side are pressed against the lens side terminals more stably and more strongly than the VBAT (B) terminal and / or the LDET (B) terminal by the fourth leaf spring 41d.

[0115] The distance between the aforementioned CLK (B) terminal and the first body-side claw 29a (the same applies to the fourth body-side claw 29d, which is omitted below) refers to 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 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.

[0116] In addition, the distance between the aforementioned CLK (B) terminal and the first body-side claw 29a (the same applies to the fourth body-side claw 29d, which is 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 distance between other body-side terminals such as the HCLK (B) terminal, the VBAT (B) terminal, and / or the LDET (B) terminal and the first body-side claw 29a is also an arc-shaped distance. 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.

[0117] The above is a description of the camera body 2, and the interchangeable lens 3 is the same. In the present embodiment, the CLK(L) terminal and the HCLK(L) terminal are arranged next to the first claw 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 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 39a on the lens side is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw 39a on the lens side, and the distance between the HCLK(L) terminal and the first claw 39a on the lens side is shorter than the distance between the VBAT(L) terminal or the LDET(L) terminal and the first claw 39a on the lens side. The first claw 39a on the lens side is held in the +Z direction ( Figure 1Therefore, similarly to the above, the CLK (L) terminal and the HCLK (L) terminal located near the first claw portion 39a on the lens side are pressed against the body side terminal more strongly than the VBAT (L) terminal or the LDET (L) terminal by the first leaf spring 41a.

[0118] In this embodiment, if Figure 5 As shown in (a), the CLK (B) terminal and the HCLK (B) terminal are arranged inside the sector (angle 50 range) formed by the center position of the opening of the mounting part 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 part 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, the first body-side claw 29a does not exist on the extension line of the dashed line 51 connecting the center position of the opening of the mounting member 21 and the LDET (B) terminal, but exists on the extension line of the dashed line 52 connecting the center position of the opening of the mounting member 21 and the HCLK (B) terminal, and exists on the extension line of the dashed line 53 connecting the center position of the opening of the mounting member 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.

[0119] like Figure 6As shown, the CLK(L) terminal and the HCLK(L) terminal are arranged inside the fan-shaped (angle 60 range) formed by the center position of the opening of the mounting member 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 member 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, the lens-side first claw 39a does not exist on the extension line of the dot-dash line 61 connecting the center position of the opening of the mounting member 31 and the LDET(L) terminal, but exists on the extension line of the dot-dash line 62 connecting the center position of the opening of the mounting member 31 and the HCLK(L) terminal, and exists on the extension line of the dot-dash line 63 connecting the center position of the opening of the mounting member 31 and the CLK(L) terminal. Thus, in the attached state, the CLK(L) terminal and the HCLK(L) terminal are in contact with the corresponding body-side terminal more stably than the LDET(L) terminal. In other words, the CLK(L) terminal and the HCLK(L) terminal are pressed against the body-side terminal with a stronger force than the LDET(L) terminal. Therefore, even if the front ends of the CLK(B) terminal and the HCLK(B) terminal are worn, the camera body 2 and the interchangeable lens 3 can communicate the clock signal stably.

[0120] The following modifications are possible, and one or more modifications can be combined with the above-described embodiment.

[0121] (Variant 1)

[0122] A terminal used for command data communication or hotline communication may also have a function of transmitting a power-on (ON) signal from the interchangeable lens 3 to the camera body 2. For example, a power switch function is provided for the interchangeable lens 3. When the interchangeable lens 3 is in the attached state and the camera system 1 is in the power-off state, the power supply section 26 also supplies power from the V33 (B) terminal to the lens-side control section 33 of the interchangeable lens 3. When the power switch of the interchangeable lens 3 is operated, the lens-side control section 33 outputs a power-on signal to the RDY (L) terminal, for example, via the lens-side communication section 34. When the body-side control section 23 detects the power-on signal via the body-side communication section 24 and the RDY (B) terminal, the camera system 1 is switched from the power-off state to the power-on state, similarly to when the power switch (not shown) provided on the camera body 2 is operated.

[0123] (Variant 2)

[0124] 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 exchanged. That is, the DATAL(B) terminal, the CLK(B) terminal, and the DATAB(B) terminal may be arranged in order from the front end side in the attachment direction.

[0125] In addition, in the above-mentioned embodiment, as an accessory, the interchangeable lens of the camera is cited as an example for explanation, but the accessories are not limited to the interchangeable lenses. For example, it can also be a teleconverter and / or a wide-angle lens, an extension tube, etc., which are attached between the camera body and the interchangeable lens to change the focal length of the interchangeable lens. Alternatively, it can also be applied to an assembly adapter that enables accessories including interchangeable lenses of other assembly standards to be attached to the assembly of the above-mentioned camera body. That is, as long as it is an accessory used for an assembly attached to the camera body, 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.

[0126] In the above-mentioned embodiment, an accessory is provided that can be removed from and installed on a camera body, but the above-mentioned camera body may be an assembly adapter that enables an interchangeable lens of the above-mentioned assembly accessory standard to be attached to a camera body that is different from the above-mentioned assembly accessory standard, or may be configured so that the above-mentioned accessory can be attached to the assembly adapter.

Claims

1. An accessory, the accessory being mounted on a camera body, the camera body comprising a first clock terminal on the camera side that outputs a first clock signal, a first data terminal on the camera side that outputs a first data signal in synchronization with the first clock signal, a third data terminal on the camera side that receives a third data signal in synchronization with the first clock signal, and two power terminals, each of which is supplied with power, The accessories include: an eighth terminal in contact with the first clock terminal on the camera side; a seventh terminal in contact with the first data terminal on the camera side; a ninth terminal in contact with the third camera-side data terminal; and The second terminal and the fourth terminal are respectively in contact with the two power terminals. The eighth terminal is arranged between the seventh terminal and the ninth terminal. The seventh terminal and the eighth terminal are located in a first partial region, and the second terminal and the fourth terminal are located in a second partial region adjacent to the first partial region.

2. An accessory, the accessory being mounted on a camera body, the camera body comprising a second clock terminal on the camera side to which a second clock signal is input, a third data terminal on the camera side to which a third data signal is input in synchronization with a clock signal different from the second clock signal, a second data terminal on the camera side to which a second data signal is input in synchronization with the second clock signal, and two power terminals, each of which is supplied with power, The accessories include: a ninth terminal in contact with the third data terminal on the camera side; a tenth terminal in contact with the second clock terminal on the camera side; an 11th terminal in contact with the second camera-side data terminal; and The second terminal and the fourth terminal are respectively in contact with the two power terminals. The tenth terminal is arranged between the ninth terminal and the eleventh terminal, The ninth terminal is located in a first local area, the second terminal and the fourth terminal are located in a second local area adjacent to the first local area, and the first local area is located between the second local area and the tenth terminal.

3. An accessory is an accessory installed on a camera body, the accessory having: an eighth terminal to which the first clock signal from the camera body is input; a seventh terminal to which a first data signal from the camera body is input in synchronization with the first clock signal; a ninth terminal configured to output a third data signal to the camera body in synchronization with the first clock signal; a tenth terminal that outputs a second clock signal to the camera body; and an 11th terminal which outputs a second data signal to the camera body in synchronization with the second clock signal, The eighth terminal, the ninth terminal, the tenth terminal, and the eleventh terminal are arranged in order from the seventh terminal.

4. The accessory according to any one of claims 1 to 3, The accessory is a replacement lens.

Images