JP7180360B2 - accessory - Google Patents

Description

The present invention relates to accessories .

An accessory that can be attached to and detached from a camera body is known (for example, Patent Document 1). Conventionally, it has been necessary to attach accessories to the camera body in a state in which they can be used properly.

Japanese Patent Application Laid-Open No. 2004-117380

According to a first aspect, an accessory is an accessory that is attachable to and detachable from a camera body and has a plurality of terminals that contact with a plurality of terminals that the camera body has, wherein at least a power supply voltage is supplied from the camera body. one power supply terminal, at least one ground terminal that is in contact with a ground terminal of the camera body and used as a ground potential, and a terminal that is different from the power supply terminal and the ground terminal and is connected to the camera body. and a first communication terminal group used for two-way first communication with the camera body. and a second communication terminal group used for the second communication, wherein the number of the power supply terminals and the number of the ground terminals are different from each other, and the detection terminals contact a plurality of terminals provided on the camera body. The power supply terminal is arranged at a position farther from the second communication terminal group than the first communication terminal group, and the first communication terminal group receives a first clock signal from the camera body. and a second terminal for outputting the first data in synchronization with the first clock signal, the second communication terminal group for transmitting the second clock to the camera body A third terminal for outputting a signal and a fourth terminal for outputting second data in synchronization with the second clock signal are provided .

Diagram schematically showing the configuration of the camera system FIG. 2 is a circuit diagram schematically showing electrical connections between the camera body and the interchangeable lens according to the first embodiment; Timing chart showing an example of command data communication Timing chart showing an example of hotline communication Front view schematically showing the mounting surface of the camera body viewed from the interchangeable lens side Front view schematically showing the mount surface of the interchangeable lens viewed from the camera body side FIG. 4 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to a second embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to a third embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to a fourth embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to a fifth embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to a sixth embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to the seventh embodiment; FIG. 11 is a circuit diagram schematically showing electrical connections between a camera body and an interchangeable lens according to an eighth embodiment; A circuit diagram schematically showing electrical connection between a camera body and an interchangeable lens according to a ninth embodiment.

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

The interchangeable lens 3 includes a lens side mount 31 , a lens side terminal holding portion 32 , a lens side communication portion 3
4, a lens side storage unit 35, an imaging optical system 36, and a drive unit 3
7. The lens side mount 31 and the lens side terminal holding portion 32 will be described in detail later.

The lens side control section 33 is composed of a microcomputer, its peripheral circuits, and the like.
The lens side communication section 34 performs data communication, which will be described later, with the camera body 2 . The lens side communication section 34 is connected to a lens side terminal group (described later) provided in the lens side terminal holding section 32 . The lens side storage unit 35 is a nonvolatile storage medium. The lens side storage section 35 is connected to the lens side control section 33 . A predetermined control program or the like executed by the lens-side control unit 33 is stored in advance in the lens-side storage unit 35 . The lens-side control unit 33 controls the interchangeable lens 3 by reading a control program from the lens-side storage unit 35 and executing the program.

The imaging optical system 36 forms a subject image on an imaging surface of an imaging element 27, which will be described later. The optical axis O of the imaging optical system 36 substantially coincides with the center positions of the lens side mount 31 and the body side mount 21 to be described later. The imaging optical system 36 of FIG. 1 generally includes a lens 36a, a focus lens 36b, and a lens 36c. The focus lens 36b is a lens that adjusts the imaging position of the subject image. The driving section 37 is connected to the lens side control section 33 and has an actuator (not shown) and the like. The drive unit 37 moves the focus lens 3 by using the actuator or the like.
6b is driven in the optical axis direction (+Z direction, -Z direction).

The camera body 2 includes a body-side mount 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 image sensor 27, and a lock pin described later. It has a switch 28 that detects the state.

The body-side control section 23 is composed of a microcomputer, its peripheral circuits, and the like.
Although the body-side control unit 23 performs various controls of the body, only the part related to communication will be described in this case, and other functions will be omitted. The body-side communication unit 24 performs data communication, which will be described later, with the interchangeable lens 3 . The body-side communication section 24 is connected to body-side terminals (described later) provided in the body-side terminal holding section 22 . Some terminals of the body-side terminal holding portion 22 are connected to the body-side control portion 23 as described later. The body-side storage unit 25 is a non-volatile storage medium. Body-side storage unit 25 is connected to body-side control unit 23 . A predetermined control program or the like executed by the body-side control unit 23 is stored in advance in the body-side storage unit 25 . The body-side control section 23 controls the camera body 2 by reading a control program from the body-side storage section 25 and executing the program.

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

FIG. 2 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3. As shown in FIG. The body-side terminal holding portion 22 includes an LDET (B) terminal, a VBAT (B) terminal, a PGND (
B) terminal, V33 (B) terminal, GND (B) terminal, RDY (B) terminal, DATAB (B)
CLK(B) terminal, DATAL(B) terminal, HCLK(B) terminal, and HDAT
It has an A (B) terminal. These eleven body-side terminals are collectively referred to as a body-side terminal group.

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

VBAT (B) terminal, PGND (B) terminal, V33 (B) terminal, GND (B) terminal
It is a terminal of a power supply system connected to the power supply unit 26 . In FIG. 2, the direction of supplied power is indicated by an arrow. A VBAT (B) terminal is a terminal used for power supply to the interchangeable lens 3 .
The drive unit 37 of the interchangeable lens 3 is driven by power supplied through the VBAT(B) terminal. The operation of the drive unit 37 requires a voltage and a current larger than those of the lens-side control unit 33, and the power supply voltage applied to the VBAT(B) terminal by the power supply unit 26 is about 10V at maximum. In the following description, the voltage applied to the VBAT (B) terminal by the power supply section 26 is referred to as drive system voltage. That is, the camera body 2 supplies the drive system power supply voltage to the interchangeable lens 3 from the VBAT (B) terminal. The PGND (B) terminal is a ground terminal corresponding to the VBAT (B) terminal, and is used as a ground potential (ground) for the power supply voltage of the driving system.

A V33(B) terminal is a terminal used for power supply to the interchangeable lens 3 . V33(B
) terminal to operate the lens-side control unit 33 and the like by power supplied from the power supply unit 26 . Each unit such as the lens-side control unit 33 operates with a smaller voltage and a smaller current than the drive unit 37 . A 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 by the power supply unit 26 to the V33(B) terminal is referred to as circuit system voltage. That is, the camera body 2 supplies the circuit system power supply voltage to the interchangeable lens 3 from the V33(B) terminal. The GND (B) terminal is a ground terminal corresponding to the V33 (B) terminal,
It is used as the ground potential (ground) of the power supply voltage of the circuit system.

The RDY (B) terminal is connected to the body side communication section 24 . DATAB (B) terminal, CL
K(B) terminal, DATA(B) terminal, HCLK(B) terminal, HDATA(B) terminal
It is a communication system terminal connected to the body side communication unit 24 . RDY (B) terminal, DATAB (
The B) terminal, the CLK(B) terminal, and the DATAL(B) terminal are used for command data communication, which will be described later. The HCLK (B) terminal and HDATA (B) terminal are connected to the body side communication section 24.
and used for hotline communication, which will be described later. In FIG. 2, arrows indicate the flow of signals. Whether or not the interchangeable lens 3 is capable of command data communication is indicated by the potential of the RDY(B) terminal. A DATAB (B) terminal is a terminal from which a data signal is output toward the interchangeable lens 3 . A CLK (B) terminal is a terminal through which a clock signal (C clock signal) is output from the camera body 2 toward the interchangeable lens 3 .

A DATA (B) terminal is a terminal to which a data signal from the interchangeable lens 3 is input.

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.

The lens-side terminal holding portion 32 includes an LDET (L) terminal, a VBAT (L) terminal, a PGND (L
) terminal, V33 (L) terminal, GND (L) terminal, RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA
(L) It has a terminal. These eleven 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, the body-side terminals and the lens-side terminals are electrically connected as indicated by broken lines in FIG. Specifically, LDE is connected to the LDET (B) terminal.
The T(L) terminal is connected, the VBAT(B) terminal is connected to the VBAT(L) terminal, and the PG
A PGND (L) terminal is connected to the ND (B) terminal, and a V33 (L) terminal is connected to the V33 (B) terminal.
The GND (L) terminal is connected to the GND (B) terminal, the RDY (L) terminal is connected to the RDY (B) terminal, and the DATAB (L) terminal is connected to the DATAB (B) terminal. The CLK(L) terminal is connected to the CLK(B) terminal, the DATAL(L) terminal is connected to the DATAL(B) terminal, and the HCLK(L) terminal is connected to the HCLK(B) terminal. , and the HDATA (B) terminal is connected to the HDATA (L) terminal. Signals to be input or output to individual lens-side terminals correspond to body-side terminals with which they are in contact.

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

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

A V33(L) terminal is a terminal used for power supply to the interchangeable lens 3 . V33(L
) terminal and the GND (L) terminal are connected to each unit such as the lens side control unit 33 . V33
(B) Power supplied from the power supply unit 26 via the terminal causes the lens side control unit 33 and the like to operate. A GND (L) terminal is a ground terminal corresponding to the V33 (B) terminal, and is used as a ground potential (ground) for the power supply voltage of the circuit system. V33 (L) terminal and GND (
A bypass capacitor C2 is connected between the L) terminals.

The RDY(L) terminal is connected to the body side communication section 24 via the RDY(B) terminal. D.
ATAB (L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal,
The HDATA (L) terminal is the DATAB (B) terminal, the CLK (B) terminal, and the DATA
Communication system terminals electrically connected to the L (B) terminal, the HCLK (B) terminal, and the HDATA (B) terminal. RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DATA
The L (L) terminal is used for command data communication, which will be described later. The HCLK(L) terminal and HDATA(L) terminal are used for hotline communication, which will be described later.

The VBAT (L) terminal and the PGND (L) terminal are connected to the driving section 37 via the lens side control section 33.
connected to The V33 (L) terminal and the GND (L) terminal are connected to each section such as the lens side control section 33 . RDY (L) terminal, DATAB (L) terminal, CLK (L) terminal, DA
The TAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal are connected to the lens side communication section 34, respectively.

(Description of command data communication)
A control instruction (command) and control contents (control data) are transmitted from the body side control section 23 to the lens side control section 33 of the interchangeable lens 3, and response contents (response data) are sent from the lens side control section 33 to the body side control section 23. and other data is called command data communication. Command data communication is full-duplex communication. Command data communication is performed via the body-side communication unit 24 and the lens-side communication unit 34 via the RDY(B) terminal, the RDY(L) terminal, and the DATAB(B) terminal.
terminal, DATAB (L) terminal, CLK (B) terminal, CLK (L) terminal, DATA (B)
and DATA (L) terminal for digital data communication.

The body-side control unit 23 transmits various control commands and control details to the interchangeable lens 3 by command data communication via the body-side communication unit 24 and the lens-side communication unit 34,
Various information is transmitted and received to and from the interchangeable lens 3 by receiving response contents and other data from the lens. The control command here is, for example, a transmission command for lens information. The various information received from the interchangeable lens 3 includes, for example, model information of the interchangeable lens 3 and information indicating optical characteristics such as the focal length of the imaging optical system 36 . The various information transmitted to the interchangeable lens 3 are
For example, it is a control command such as a lens drive command, control details such as a lens drive amount, model information of the camera body 2, and the like. The control command also includes a drive command for the focus lens 36b. The lens-side control unit 33 receives various control commands from the body-side control unit 23, acquires control contents from the body-side control unit 23, and sends response contents (for example, In response to an initialization control command from the camera body 2, information regarding the execution status of the initialization process such as initialization is in progress, initialization is completed, etc.) is transmitted.

FIG. 3 is an example of a timing chart showing the timing of command data communication. The body-side control unit 23 first checks the signal level of the RDY (B) terminal at the start of command data communication (T1). The signal level of the RDY(B) terminal indicates whether command data communication of the lens side control section 33 is possible or not. When the command data communication cannot be performed, the lens-side control unit 33 sets the signal level (potential) of the RDY (L) terminal to high level (H level). When the lens-side control unit 33 is ready to perform command data communication, the lens-side control unit 33 changes the signal level (potential) of the RDY (L) terminal to a low level (L level) via the lens-side communication unit 34.
to

At the start of command data communication (T1), if the signal level of the RDY (B) terminal is low level (L level), the body side control section 23 receives CLK (B) through the body side communication section 24.
A C clock signal 401 is output from the terminal. That is, the body-side control unit 23 controls CLK(B
) terminal and the CLK(L) terminal to the lens-side control section 33 . The frequency of repeating the high level and low level of the C clock signal 401 in FIG.
For example, 8 MHz. The body-side control unit 23 synchronizes with the C clock signal 401 to synchronize the DAT
A body-side command signal 402, which is a control command, is output from the AB (B) terminal. i.e.
The body side control section 23 transmits the body side command signal 402 to the lens side control section 33 via the DATAB(B) terminal and the DATAB(L) terminal. A body-side command signal 402 indicated by switching between a high level and a low level of DATAB in FIG. 3 is a signal representing control instructed by the body-side control section 23 to the lens-side control section 33 by command data communication. For example, the body-side command signal 402 is a signal representing a request for model information of the interchangeable lens 3 or a signal representing an instruction to drive the focus lens 36b. As shown in FIG. 3, the timing at which the body-side command signal 402 is transmitted differs from the cycle of the C clock signal 401 . The command signal 402 is periodically transmitted at intervals of at least about 8 milliseconds in the case of initialization processing performed when the power of the camera system 1 is turned on and end processing performed when the power is turned off. However, other than that, it is sent at an arbitrary timing.

When the lens-side control unit 33 receives the body-side command signal 402 via the lens-side communication unit 34, it uses the error detection code (for example, checksum data) included in the body-side command signal 402 to generate the body-side command signal. Inspection processing for inspecting the presence or absence of a communication error 402 is executed. After that, the lens side control section 33 sets the signal level of the RDY (L) terminal to high level (H level) (T2). The body-side control unit 23 does not transmit the C clock signal or the body-side command signal 402 when the signal level of the RDY(B) terminal is high.
The lens side control section 33 starts the first control processing 404 based on the instruction of the received body side command signal 402 .

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

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 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 representing the control parameters of the body-side command signal 402 . For example, body side command signal 4
02 is a signal representing an instruction to drive the focus lens 36b, the corresponding body-side data signal 406 is a signal representing the drive amount of the focus lens 36b. Alternatively, the body-side data signal 406 is a signal representing information (model information of the camera body, etc.) required by the lens-side control unit 33 in command data communication.

Also, when the C clock signal 405 is input to the CLK (L) terminal, the lens side control section 33
outputs the lens side data signal 407 from the DATAL (L) terminal in synchronization with the C clock signal 405 . The lens side data signal 407 indicated by switching between high level and low level of DATA in FIG.
3 is the signal to be sent to . For example, when the body-side command signal 402 is a signal representing a request for model information of the interchangeable lens 3 , the corresponding lens-side data signal 407 is a signal representing model information of the interchangeable lens 3 . As shown in FIG. 3, the timing at which the body-side data signal 406 and the lens-side data signal 407 are transmitted differs from the period of the C clock signal 405 . The body-side data signal 406 and the lens-side data signal 407 take about 8 milliseconds at the shortest in the case of initialization processing performed when the power of the camera system 1 is turned on (power-on) and end processing performed when the power is turned off. It is transmitted periodically at intervals, but other than that, it is transmitted at arbitrary timing.

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

Here, the first control processing 404 and the second control processing 408 performed by the lens side control section 33 will be described. For example, a case where the received body-side command signal 402 requests specific information about the interchangeable lens 3 will be described. The lens-side control unit 33 performs first control processing 40
4, a process of generating the requested information as the lens side data signal 407 is executed. The lens side data signal 407 generated by the first control processing 404 is transmitted to the lens side communication section 34
, DATAL (L) terminal, and DATAL (B) terminal to the body side communication section 24 of the body side control section 23 .

For example, a case where the received body-side command signal 402 is a signal representing an instruction to drive the focus lens 36b will be described. As a first control process 404, the lens-side control unit 33 executes 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 by the first control processing 404 is transmitted as the lens side data signal 407 to the lens side communication unit 34, the DATAL (L) terminal, and the DAT.
It is transmitted to the body side communication section 24 of the body side control section 23 via the AL(B) terminal. As a second control process 408 , the lens-side control unit 33 executes a process of driving by the drive amount designated by the body-side data signal 406 .

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

The communication performed at the timings T1 to T5 described above is one command data communication.
In one command data communication, the body side control section 23 sends the body side command signal 40
2 and body side data signal 406 are transmitted. Namely, the body side command signal 40
2 and the body-side data signal 406 are combined into one control instruction (command) and control content (
control data).

As described above, the lens-side control unit 33 receives control instructions (commands) and control details (control data) from the body-side control unit 23, and responds to the body-side communication unit 24 (response data).
are sent in parallel. That is, command data communication is so-called full-duplex communication.

(Explanation of hotline communication)
As another communication system, there is communication in which data is unidirectionally transmitted from the lens-side control unit 33 of the interchangeable lens 3 to the body-side control unit 23 of the camera body 2, and this is called hotline communication. In the hotline communication, the body-side control unit 23 and the lens-side control unit 33 communicate via the body-side communication unit 24 and the lens-side communication unit 34 via the HCLK (B) terminal, the HCLK (L) terminal,
Data communication is performed using the HDATA (B) terminal and the HDATA (L) terminal. The body-side control unit 23 acquires information about the state of the interchangeable lens 3 from the lens-side control unit 33 of the interchangeable lens 3 by hotline communication. The information about the state of the interchangeable lens 3 is
For example, the position of the focus lens 36b, the position of a camera shake correction lens (not shown), the drive position of the aperture blades, and the like. Note that the camera shake correction lens is a member that can be moved (drivable) so as to include a component in the direction perpendicular to the optical axis direction, and the diaphragm is moved (drivable) so as to change the size of the aperture through which the light beam passes. ) is a possible member. In this hotline communication, when an instruction to start communication is sent from the camera body via command data communication, lens side control is performed independently of command data communication until an instruction to end communication is sent. This is communication in which the unit 33 autonomously transmits lens data to the body-side control unit 23 .

FIG. 4 is an example of a timing chart showing the timing of hotline communication. The lens side control section 33 sends a hotline communication start command to the body side control section 2 of the camera body.
3 through command data communication (T6), generation processing 501 is performed. The generation process 501 is a process of acquiring the lens state at, for example, a sampling period of 1 millisecond and generating a lens signal 503 for hotline communication. When the generation of the lens signal 503 is completed (T7), the lens side control section 33 outputs the H clock signal 502 from the HCLK (L) terminal via the lens side communication section . That is, the HCLK (L) terminal and the HCLK (
B) Transmit the H clock signal 502 to the body side control section 23 via the terminal. The frequency of repeating the high level and low level of the H clock signal 502 in FIG.
8 MHz. That is, the frequency of the H clock signal 502 for hotline communication is the same as or lower than the frequency of the C clock signal 401 for command data communication. That is, the cycle of the H clock signal 502 for hot line communication is the same as or longer than the cycle of the C clock signal 401 for command data communication.

The lens-side control unit 33 transmits the lens signal 503 (for example, information about the position of the focus lens 36b) generated in the generation process 501 to the H clock signal 5 via the lens-side communication unit 34.
02 and output from the HDATA (L) terminal. That is, the lens-side control unit 33
A lens signal 503 is transmitted to the body side communication section 24 of the body side control section 23 via the lens side communication section 34, the HDATA (L) terminal, and the HDATA (B) terminal. HDATA in Figure 4
A lens signal 503 indicated by switching between a high level and a low level is a signal transmitted from the lens-side control section 33 to the body-side control section 23 by hotline communication. The output of the H clock signal 502 and lens signal 503 ends at timing T8.
The lens-side control unit 33 repeats transmission of lens data by hotline communication at regular intervals (for example, 1 millisecond) until an instruction to stop transmission of the lens signal 503 is received by command data communication. As shown in FIG. 4, the timing at which lens data is transmitted by hotline communication is different from the period of the H clock signal 502 . The transmission interval of lens data by hotline communication is shorter than the interval of transmission and reception of control instructions (commands) and control contents (control data) by command data communication described above.

Some or all of the command data communication and the hotline communication can be executed in parallel. That is, the body-side control unit 23 and the lens-side control unit 33 can start and end hotline communication while performing command data communication. It is also possible to start and end command data communication during hotline communication.

As described above, hotline communication is performed independently of command communication. The lens-side control unit 33 transmits information about the state of the interchangeable lens 3 to the body-side control unit 23 through hotline communication regardless of command communication. Therefore, the body-side control section 23 can continuously grasp the state of the interchangeable lens 3 even during command communication. For this reason, the body-side control unit 23 can continuously grasp the position of the focus lens 36b, so that, for example, autofocus can be controlled at high speed. The same applies to camera shake correction control and aperture control.
Further, the body-side control section 23 can issue various instructions to the interchangeable lens 3 at any timing by command communication even while the lens-side control section 33 is performing hotline communication.

(Description of lens mount mechanism)
The camera system 1 of this embodiment includes a so-called bayonet lens mount 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.

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

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

The first body-side claw portion 29a to the fourth body-side claw portion 29d have different lengths in the circumferential direction. Specifically, the first body-side claw portion 29a is the longest, the third body-side claw portion 29c is the second longest, the fourth body-side claw portion 29d is the third longest, and the second body-side claw portion 29b is the longest. Shortest.

The body-side claw portion 29 protrudes from the body-side mount 21 toward the center of the opening, and the circumference of the opening has a portion where the body-side claw portion 29 exists and a portion where the body-side claw portion 29 does not exist. . 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 mount 21 will be referred to as the first body-side insertion/extraction portion 40a.
called. Similarly, the space 40 between the first body-side claw portion 29a and the second body-side claw portion 29b
The space 40c between the body-side second claw portion 29b and the body-side third claw portion 29c is defined as the body-side third insertion-extraction portion 40c and the body-side third claw portion 29c. A space 40d between the fourth body-side claw portion 29d is referred to as a fourth body-side insertion/extraction portion 40d. These four body side insertion/removal portions are collectively referred to as body side insertion/removal portions 40 .

A body-side terminal holding portion 22 is provided inside the opening of the body-side mount 21 . The body-side terminal holding portion 22 has an arcuate shape corresponding to the shape of the annular body-side mount 21 . The body-side terminal holding part 22 is arranged above the opening of the body-side mount 21 in parallel with the opening of the body-side mount 21, and is preferably arranged in the center of the upper part as shown in FIG. 5(a). The body-side terminal holding portion 22 has a plurality of body-side terminals as described above. The plurality of body-side terminals are arranged in a line on the body-side terminal holding portion 22 inside the body-side mount 21 in an arc shape. A plurality of body-side terminals are H-shaped from the right side as shown in FIG.
DATA(B), HCLK(B), DATA(B), CLK(B), DATAB(B)
, RDY(B), GND(B), V33(B), PGND(B), VBAT(B), and LDET(B) on the leftmost side. Each body-side terminal group is a conductive pin. The body-side terminal group is pushed in the -Z direction (FIG. 1) by a spring or the like (not shown). - The Z direction is the direction toward the interchangeable lens 3 attached to the camera and the direction of the subject.

The body-side mount 21 has a hole through which the lock pin 42 passes. The hole through which the lock pin 42 penetrates is arranged on the upper right side of the fourth body-side claw portion 29d. In other words, the body side mount 2
1, the hole of the lock pin 42 is located between the region where the fourth body side claw portion 29d exists and the region where the first body side claw portion 29a exists in the opening of the body side mount 21. placed. The lock pin 42 is pushed in the -Z direction (FIG. 1) by a spring or the like (not shown).

FIG. 5B is a schematic view of the mount of the camera body 2 with the body side mount 21 removed, viewed from the interchangeable lens 3 side. A position corresponding to the body side first claw portion 29a (body side first
A first plate spring 41a is provided on the rear side of the claw portion 29a. Similarly, the body-side second claw portion 2
A second plate spring 41b is provided at a position corresponding to 9b (on the back side of the second body-side claw portion 29b), and a position corresponding to the third body-side claw portion 29c (on the back side of the third body-side claw portion 29c). is provided with a third leaf spring 41c, and a fourth leaf spring 41d is provided at a position corresponding to the fourth body-side claw 29d (behind 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 a lens-side claw portion, which will be described later, in the +Z direction (toward the camera body 2).

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

The lens-side claw portion 39 extends from the outer circumference of the cylindrical portion of the lens-side mount 31 to the outside of the mount (optical axis O
radial direction). As shown in FIG. 6, the lens side first
The claw portion 39a is at the upper left position, the second lens side claw portion 39b is at the upper right position, the third lens side claw portion 39c is at the lower right position, and the fourth lens side claw portion 39d is at the lower left position. placed.
On the rear side of the lens-side claw portion 39 (on the reference surface side of the lens-side mount 31), there is a space for inserting the corresponding body-side claw portion 29 when the interchangeable lens 3 is attached to the camera body 2.例文帳に追加

A lens-side terminal holding portion 32 is provided inside the opening of the lens-side mount 31 . The lens-side terminal holding portion 32 has an arcuate shape corresponding to the shape of the annular lens-side mount 31 . The lens-side terminal holding portion 32 is arranged above the lens-side mount 31 in parallel with the opening of the lens-side mount 31, and is preferably arranged in the center of the upper portion as shown in FIG. 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 line on the lens-side terminal holding portion 32 inside the lens-side mount 31 in an arc shape. As shown in FIG. 6, the plurality of lens-side terminals are LDET (L), VB
AT (L), PGND (L), V33 (L), GND (L), RDY (L), DATAB
Eleven terminals of (L), CLK(L), DATAL(L), HCLK(L), and HDATA(L) are arranged. The lens-side terminal group is arranged such that the conductive contact surfaces thereof are exposed in the +Z direction (FIG. 1). The +Z direction is the direction in which subject light that has passed through the imaging optical system 36 travels toward the imaging element 27 .

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

When the interchangeable lens 3 is attached to the camera body 2, the plurality of body-side terminals physically contact the corresponding plurality of lens-side terminals. This contact electrically connects the plurality of body-side terminals and the plurality of lens-side terminals. That is, the plurality of body-side terminals and the plurality of lens-side terminals are electrically connected.

(Attaching an interchangeable lens)
A method of attaching the interchangeable lens 3 to the camera body 2 will be described. When attaching the interchangeable lens 3 to the camera body 2, first, the body-side mount 21 and the lens-side mount 31 are opposed to each other, the lens-side first hook portion 39a is aligned with the body-side first insertion/removal portion 40a, and the lens-side second hook portion 39a is aligned.
The claw portion 39b is aligned with the body side second insertion/removal portion 40b, the lens side third claw portion 39c is aligned with the body side third insertion/removal portion 40c, and the lens side fourth claw portion 39d is aligned with the body side fourth insertion/removal portion. 4
Align to the 0d position. Then, the lens side first claw portion 39a is inserted into the body side first insertion/extraction portion 40a, the lens side second claw portion 39b is inserted into the body side second insertion/extraction portion 40b, and the lens side third claw portion 39c is inserted into the body side insertion/extraction portion 40b. It is inserted into the third insertion/removal portion 40c, and the lens side fourth claw portion 39d is inserted into the body side fourth claw portion 39d.
It is inserted into the insertion/removal portion 40d. At this time, the LDET (L) terminal is connected to the CLK (B) terminal, and the VBA
T (L) terminal to DATAL (B) terminal, PGND (L) terminal to HCLK (B) terminal,
The V33 (L) terminal is in contact with the HDATA (B) terminal.

From this state, the interchangeable lens 3 is rotated in the mounting direction 44 shown in FIGS. That is, the first body-side claw portion 29a enters the space behind the first lens-side claw portion 39a, the second body-side claw portion 29b enters the space behind the second lens-side claw portion 39b, and Third claw portion 2
9c enters the space behind the third lens-side claw portion 39c, and the fourth body-side claw portion 29d enters the space behind the fourth lens-side claw portion 39d. At this time, the plurality of lens-side terminals sequentially come into contact with the plurality of body-side terminals. Note that the camera body 2 instead of the interchangeable lens 3 may be rotated in a direction opposite to the mounting direction 44 shown in FIGS.

When the lens-side claw portions 39 are inserted into the corresponding body-side insertion/extraction portions 40 and rotated in the mounting direction 44, for example, the LDET (L) terminal becomes the CLK (B) terminal, DATAB (B) terminal,
RDY (B) terminal, GND (B) terminal, V33 (B) terminal, PGND (B) terminal, VBA
Contact the T(B) terminal and the LDET(B) terminal in this order. For example, VBAT (L) terminal is DA
TAL (B) terminal, CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, GN
The D (B) terminal, the V33 (B) terminal, the PGND (B) terminal, and the VBAT (B) terminal are contacted in this order. For example, PGND (L) terminal is HCLK (B) terminal, DATAL (B) terminal, CLK
(B) terminal, DATAB (B) terminal, RDY (B) terminal, GND (B) terminal, V33 (B
) terminal and then the PGND (B) terminal. For example, V33 (L) terminal is HDATA (B
) terminal, HCLK (B) terminal, DATAL (B) terminal, CLK (B) terminal, DATAB (
B) terminal, RDY (B) terminal, GND (B) terminal, and V33 (B) terminal are contacted in order. For example, the GND (L) terminal is the HDATA (B) terminal, the HCLK (B) terminal, and the DATAL (B) terminal.
CLK (B) terminal, DATAB (B) terminal, RDY (B) terminal, and GND (B) terminal are contacted in order.

For example, RDY (L) terminal is HDATA (B) terminal, HCLK (B) terminal, DATAL (
B) terminal, CLK (B) terminal, DATAB (B) terminal, and RDY (B) terminal are contacted in order. For example, DATAB (L) terminal is HDATA (B) terminal, HCLK (B) terminal, DATA
The L(B) terminal, the CLK(B) terminal, and the DATAB(B) terminal are contacted in this order. For example CLK
(L) terminal is HDATA (B) terminal, HCLK (B) terminal, DATAL (B) terminal, CL
Contact the K (B) terminals in order. For example, DATA (L) terminal is HDATA (B) terminal, H
The CLK(B) terminal and the DATAL(B) terminal are contacted in this order. For example, the HCLK(L) terminal contacts the HDATA(B) terminal and the HCLK(B) terminal in that order.

When the interchangeable lens 3 is rotated by a predetermined angle with respect to the camera body 2, the attachment completion position is reached. At the attachment completion position, the corresponding body-side claw portion 29 and lens-side claw portion 39 face each other in the optical axis direction, and the lock pin 42 is pushed in the -Z direction in FIG. When the lock pin 42 enters the lock pin receiving portion 43 , the interchangeable lens 3 cannot be rotated for removal from the camera body 2 . That is, when the body-side claw portion 29 and the lens-side claw portion 39 reach the predetermined attachment completion positions, the relative positions of the body-side mount 21 and the lens-side mount 31 are fixed. The lens-side claw portion 39 is moved toward the body (+Z direction in FIG. 1) by a leaf spring 41.
pushed by Thereby, each of the plurality of lens-side terminals contacts and is electrically connected to each of the corresponding plurality of body-side terminals.

In the following description, the state in which the body-side claw portion 29 and the lens-side claw portion 39 have reached predetermined mounting completion positions is referred to as a mounting completion state. Mounting is a state in which the lens side claw portion 39 is in the middle of rotating from the position where the lens side claw portion 39 is inserted into the body side insertion/extraction portion 40 to just before the mounting completion position, or a state in the middle of rotating from just before the mounting completion position to the insertion position. called a state.

In the mounting state, the signal level of the LDET (B) terminal is pulled up and is at high level. The body-side control unit 23 determines that the interchangeable lens 3 is not attached when it is detected that the signal level of the LDET (B) terminal is high. When the interchangeable lens 3 is not attached, the body-side control unit 23 supplies VBAT (B) to the power supply unit 26.
Power is not supplied to the terminal and V33(B) terminal.

In the mounting completion state, the signal level of the LDET (B) terminal is pulled down to low level as described above (FIG. 2). The body-side control section 23 determines that the interchangeable lens 3 has been attached when it is detected that the signal level of the LDET (B) terminal has become a low level. In addition, when the mounting is completed, the lock pin 42 enters the lock pin receiving portion 43 and the switch 28 (FIG. 1) interlocked with the lock pin 42 is turned on. When the body-side control unit 23 detects that the signal level of the LDET (B) terminal has become low level and that the switch 28 has been turned on, the power supply unit 26 starts supplying power to the V33 (B) terminal. That is, the power supply voltage of the circuit system is supplied. Note that the camera body 2 does not necessarily have to include the switch 28 . switch 2
8, the power supply unit 26 may start supplying power to the V33(B) terminal when it is detected that the signal level of the LDET(B) terminal has become low level.

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

When the user presses an unlocking button (not shown) of the camera body in the mounting completion state, the lock pin 42 is retracted from the lock pin receiving portion 43 . Thereby, the relative positions of the body-side mount 21 and the lens-side mount 31 can be changed. When the user presses a lock release button (not shown), the body-side control unit 23 turns off the switch 28 linked to the lock release button, causing the power supply unit 26 to supply power to the VBAT (B) terminal and the V33 (B) terminal. stop. From this state, when the interchangeable lens 3 is rotated in a direction opposite to the mounting direction 44 shown in FIGS. 5 and 6, the plurality of lens-side terminals come into contact with the plurality of body-side terminals in the order opposite to that described above. To go.

It should be noted that the power supply does not have to be stopped in conjunction with the operation of the lock release button. in this case,
The body-side control unit 23 rotates the interchangeable lens 3 in a direction opposite to the mounting direction 44 to rotate the LDET (
When the L) terminal and the LDET (B) terminal are separated and it is detected that the signal level of the LDET (B) terminal has changed from the low level to the high level, the VBAT (B) terminal and the V33 (B) are supplied to the power supply section 26 . Stop power supply to the terminal. By doing so, the camera system 1
can reduce the number of parts. Also, if the unlock button is pressed and the LDET
The power supply unit 26 may stop supplying power to the VBAT (B) terminal and the V33 (B) terminal when detecting both that the signal level of the (B) terminal changes from low level to high level. . Alternatively, when detecting either the pressing of the lock release button or the change of the signal level of the LDET (B) terminal from the low level to the high level, the body side control section 23 supplies the power supply section 26 with VBAT The power supply to the (B) terminal and the V33(B) terminal may be stopped.

During attachment and detachment of the interchangeable lens to the camera body (
(during installation), the lens-side terminal comes into contact with the body-side terminal other than the corresponding terminal when the installation is completed. The arrangement of the lens-side terminals and the body-side terminals should desirably minimize problems caused by contact during attachment and detachment.

(Terminal layout considering noise)
In the present embodiment, the LDET (B) terminal among the plurality of body-side terminals is arranged at the tip in the mounting direction of the lens (arrow 44 in FIG. 5A). That is, the LDET (B) terminal is arranged on the leftmost side of the body-side terminal group in FIG. 5(a) as described above. Among the plurality of lens-side terminals, the LDET (L) terminal was similarly arranged at the tip in the mounting direction of the lens (arrow 44 in FIG. 6). That is, the LDET (L) terminal is arranged on the rightmost side of the lens-side terminal group in FIG. 6 as described above. Therefore, the LDET (B) terminal does not come into contact with any lens-side terminal other than the LDET (L) terminal until the mounting of the mounting lens is completed. Therefore, the signal level of the LDET (B) terminal does not erroneously become low level during the mounting process of the interchangeable lens, and the mounting of the lens is not erroneously recognized.

In the present embodiment, the VBAT (B) terminal is arranged next to the LDET (B) terminal, that is, second from the tip in the mounting direction. The VBAT (L) terminal was placed next to the LDET (L) terminal, that is, second from the most tip in the mounting direction. The purpose of this arrangement is to reduce the number of terminals on the lens side that come into contact with the VBAT (B) terminal on the camera body side during the process of mounting the lens. Since the power supply voltage of the drive system applied to the VBAT(B) terminal is higher than the other terminals, VBAT(B) may be If the terminal comes into contact with a terminal other than the VBAT (L) terminal, this high voltage may apply an unexpected load to the electric circuit inside the interchangeable lens. In this embodiment, the VBAT(B) terminal is positioned next to the LDET(B) terminal, so that only one of the plurality of lens-side terminals is connected to the VBAT(B) terminal while the interchangeable lens 3 is attached. Only the LDET (L) terminal is contacted. As shown in FIG. 2, the LDET (L) terminal is grounded via a resistor R3, so that even if a high voltage is applied from the VBAT (B) terminal, the camera system 1 is not affected.

In this embodiment, the PGND (B) terminal, which is the ground potential, is arranged next to the VBAT (B) terminal, that is, third from the tip in the mounting direction. PGND (L) terminal, VBAT (L)
It was arranged next to the terminal, that is, third from the tip in the mounting direction. A high voltage 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 becomes PGN.
Contact the D (B) terminal. The charge stored in capacitor C1 is ground potential PGND
(B) It is quickly discharged from the terminal and does not affect other circuits of the camera system 1 .

In this embodiment, the V33 (B) terminal is arranged next to the PGND (B) terminal, that is, the fourth from the tip in the mounting direction, and the GND (B) terminal is arranged next to it, that is, the fifth from the tip. did. Next to the PGND (L) terminal, that is, V33 (L) next to the fourth tip from the mounting direction
A terminal was arranged, and the GND (L) terminal was arranged next to it, ie, fifth from the tip. V3
The voltage supplied from the V33 (B) terminal is accumulated in the capacitor C2 connected to the 3 (L) terminal. When the interchangeable lens 3 is rotated in the removal direction, the V33(L) terminal
Contact the GND (B) terminal first. The charge accumulated in the capacitor C2 is quickly discharged from the GND (B) terminal, which is the ground potential, and does not affect other circuits of the camera system 1. FIG.

The RDY (B) terminal is arranged next to the GND (B) terminal, that is, the sixth from the tip, and the DATAB (B) terminal is arranged next to it, that is, the seventh from the tip. The CLK (B) terminal is placed eighth, and the DAT next to it, that is, the ninth from the tip
The AL (B) terminal is arranged, and the HCLK (B)
A terminal was arranged, and the HDATA (B) terminal was arranged at the rearmost end next to it.

The RDY (L) terminal is arranged next to the GND (L) terminal, i.e., the sixth from the tip, and the DATAB (L) terminal is arranged next to it, i.e., the seventh from the tip. The CLK (L) terminal is placed eighth, and the DAT next to it, that is, the ninth from the tip
AL (L) terminal is arranged, and HCLK (L)
The terminals were arranged, and the HDATA (L) terminal was arranged at the rearmost end next to them.

Next, the influence of noise on the communication line composed of each body-side terminal and each lens-side terminal will be described. Hotline communication unilaterally sends information (
lens data), and is performed frequently (repeatedly at very short intervals).
During hotline communication, a clock signal (H) is sent from the HCLK(L) terminal to the HCLK(B) terminal.
clock signal) is sent. Since the clock signal is a signal that repeats a high level and a low level in a short cycle, it can become a large noise source with respect to other signals. Furthermore, HCLK(L
) terminal to the HCLK (B) terminal is the signal output from the interchangeable lens 3, so even if the clock signal contains noise, the camera body 2 can recognize the noise. Can not. As described above, the clock signal (H clock signal) flowing through the HCLK terminal may become a noise source, or the clock signal (H clock signal) may contain noise, which may cause the camera system 1 to malfunction. be. Examples of malfunction include erroneous detection of attachment of an interchangeable lens and erroneous determination of command communication.

In this embodiment, the HCLK terminal is arranged at a position away from the VBAT terminal to which a high voltage is applied. Since the voltage/current of the VBAT terminal that drives the drive unit 37 of the interchangeable lens 3 fluctuates depending on the drive state of the drive unit 37, fluctuations in the voltage/current of the VBAT terminal may cause noise to other terminals. Therefore, by separating the VBAT terminal from the HCLK terminal, the V
It is possible to suppress the influence of noise caused by fluctuations in the voltage/current of the BAT terminal on the clock signal (H clock signal). It is possible to suppress noise from being added to the clock signal (H clock signal).
The RDY terminal is a terminal used to indicate whether or not command communication is possible. The HCLK terminal, which can be a noise source, is placed away from the RDY terminal so as not to be adjacent to it. Therefore, it is possible to suppress the noise caused by the clock signal (H clock signal) from affecting the signal at the RDY terminal.

Also, the HDATA terminal and the DATAL terminal are arranged on both sides of the HCLK terminal. By doing so, it is possible to suppress the influence of noise from the HCLK terminal on terminals other than the HDATA terminal and the DATAL terminal. A signal flowing through the HDATA terminal and the DATAL terminal fluctuates less than the clock signal (H clock signal). This is because it is possible to suppress the influence of variations in the clock signal (H clock signal) from reaching terminals other than the HDATA terminal and the DATAL terminal.

Next, command data communication is communication for bidirectionally transmitting and receiving information between the body and the interchangeable lens as described above. During command data communication, a clock signal (C clock signal) is sent from the CLK(B) terminal to the CLK(L) terminal. The clock signal transmitted at the CLK terminal can also be a noise source for the same reason as described above. Also, if noise is added to the clock signal (C clock signal), an abnormality will occur in command communication. Therefore, in this embodiment, CLK
The terminal is located away from the VBAT terminal to which a high voltage is applied. Drive unit 3 of interchangeable lens 3
Since the voltage/current of the VBAT terminal that drives the circuit 7 fluctuates depending on the driving state of the drive unit 37, fluctuations in the voltage/current of the VBAT terminal may cause noise to other terminals. Therefore, by separating the VBAT terminal from the CLK terminal, it is possible to suppress the influence of noise at the VBAT terminal on the clock signal (C clock signal). That is, the clock signal (C
clock signal) can be suppressed.
Also, the CLK terminal is arranged away from the RDY terminal used to indicate whether command communication is possible or not.

Also, if the HCLK terminal and the CLK terminal are adjacent to each other, one clock signal may affect the other clock signal and become a noise source. In this embodiment, the DATAL terminal is arranged between the CLK terminal and the HCLK terminal. In addition, between the CLK terminal and the RDY terminal, there is a DATA
The B terminal is arranged. That is, the DATAL terminal and the DATAB terminal are arranged on both sides of the CLK terminal. By doing so, it is possible to suppress the influence of noise caused by the CLK terminal on the camera system. Since the signal flowing through the DATA and DATAB terminals fluctuates less than the clock signal (C clock signal), it is possible to suppress the influence of fluctuations in the clock signal (C clock signal) from reaching terminals other than the DATA and DATAB terminals. is.
If the DATAL terminal is arranged between the CLK terminal and the HCLK terminal, the signal flowing through the DATAL terminal fluctuates less than the clock signal (C clock signal) of the CLK terminal and the clock signal (H clock signal) of the HCLK terminal. The clock signal (H clock signal) at the HCLK terminal is affected by fluctuations in the clock signal (C clock signal) at the terminal.
This is because the influence of fluctuations in the clock signal (H clock signal) at the CLK terminal can be suppressed from affecting the clock signal (C clock signal) at the CLK terminal.

Also, as described above, it is necessary to determine the level of the RDY terminal in order to perform command data communication. That is, since the signal level of the RDY terminal indicates whether or not command data can be communicated, noise has a great influence on the photographing operation. Here, consider a case where the body-side control unit 23 erroneously recognizes that communication is possible due to noise, although command data cannot be communicated. In this case, the lens-side control unit 33 cannot receive the command data, but the body-side control unit 23 transmits the command data, and if the interchangeable lens is controlled according to the command data, the body-side control unit 23 erroneously recognizes it. do. However, since the lens-side control unit 33 cannot accept the command data, control is not performed according to the erroneously transmitted command data. Therefore, the operation of the camera system 1 is hindered. Therefore, 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 desirable to arrange terminals on both sides of the RDY terminal through which a relatively stable signal, that is, a signal with little change in signal level per unit time flows. In this embodiment, the GND terminal and the DATAB terminal are arranged on both sides of the RDY terminal. Since the GND terminal is a terminal with a ground potential, it is stable, and the DATAB terminal is also a terminal through which a stable signal flows compared to the CLK terminal and the HCLK terminal. Since this is done, the influence of noise on the signal of the RDY terminal can be suppressed.

Next, power supplied from the VBAT(B) terminal to the VBAT(L) terminal (power supply voltage of the drive system) is used to drive the actuator (for example, stepping motor, etc.) of the drive section 37 of the interchangeable lens 3 . Therefore, the current flowing through the VBAT terminal varies greatly depending on whether the actuator is being driven or not. Such current fluctuations become a noise source for signals flowing through other terminals. In this embodiment, the VBAT terminal is located away from the RDY, DATAB, CLK, and DATAL terminals used for command data communication, and the HCLK and HDATA terminals used for hotline communication. Further, between the VBAT terminal and terminals used for these communications, a GND terminal and a V33
, and a PGND terminal. Among them, especially the GND terminal and the PGND terminal are ground potential terminals, so that the influence of noise can be suppressed. This suppresses the influence of noise caused by fluctuations in the current flowing through the VBAT terminal on data communication.

The terminal arrangement in consideration of the noise explained above is summarized here.
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. As a result, the influence of noise on the RDY terminal used to indicate whether command communication is possible or not can be suppressed.
The HCLK terminal, which is a noise source, is sandwiched between the HDATA terminal and the DATAL terminal, and the CLK terminal is sandwiched between the DATAL terminal and the DATAB terminal. That is, from the rear end in the mounting direction, the HD
ATA terminal, HCLK terminal, DATAL terminal, CLK terminal and DATAB terminal are arranged.
As a result, the influence of noise caused by the clock signal to the RDY terminal or the like can be suppressed.
Furthermore, in consideration of the influence of noise, the terminal group for power supply and the terminal group used for communication are separated from each other with the RDY terminal interposed therebetween. More specifically, the VBAT terminal, the PGND terminal, the V33 terminal, and the GND terminal, which are power supply terminals, are arranged in order from the tip side on the front end side in the mounting direction across the RDY terminal, and the terminals for communication are arranged on the rear end side in the mounting direction. DATAB terminal, CLK terminal,
A DATAL terminal, an HCLK terminal, and an HDATA terminal are arranged in this order from the tip side. As a result, it is possible to suppress the influence of the power supply terminal group such as the VBAT terminal on the terminals used for communication. In addition, it is possible to suppress the influence of noise on the power supply terminal group such as the VBAT terminal and the RDY terminal of the terminal group used for communication such as the HCLK terminal and the CLK terminal.

An HCLK terminal to which a clock signal (H clock signal) used for hotline communication is sent, and a CLK terminal to which a clock signal (C clock signal) used for command data communication is sent.
In terms of terminals, the HCLK terminal is located farther from the VBAT terminal than the CLK terminal.
This is because the clock signal (C clock signal) sent to the interchangeable lens through the CLK terminal is output by the body side control section 23 via the body side communication section 24, but the interchangeable lens is transmitted to the lens side communication section 3
If the clock signal (H clock signal) sent to the camera body via the HCLK (L) terminal via 4 is mixed with noise, the body-side control unit 23 misrecognizes the clock signal (H clock signal) of the HCLK terminal. This is because noise has a greater influence on the camera system 1 .
As for the HCLK terminal and the GND terminal, the HCLK terminal is located farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. This can shield noise caused by the VBAT terminal to the HCLK terminal to which the clock signal (H clock signal) used for hot line communication is sent.
As for the CLK terminal and the GND terminal, the CLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. As a result, noise caused by the VBAT terminal to the CLK terminal to which the clock signal (C clock signal) used for command data communication is sent can be shielded.

(Terminal layout considering wear)
Now, the contact of each terminal when the interchangeable lens 3 is attached to and detached from the camera body 2 will be described.
When the interchangeable lens 3 is attached to the camera body 2, the body-side terminals come into contact with the lens-side terminals one after another. The same applies when removing the interchangeable lens 3 from the camera body 2 . That is, the body-side terminals, which are pins protruding from the body-side terminal holding portion 22, and the lens-side terminals, which are exposed conductive contact surfaces, are rubbed one after another. Since a plurality of interchangeable lenses are attached to and detached from one camera body, the body-side terminals are more easily worn than the lens-side terminals. In particular, the body-side terminals positioned on the rear end side in the mounting direction of the interchangeable lens 3 are rubbed against more lens-side terminals, and are subjected to more friction. Therefore, the tip of the body terminal positioned closer to the rear end is more likely to be worn than the body terminal positioned closer to the tip. Wear of the body-side terminals affects contact with the lens-side terminals, and data communication may become unstable.
In this embodiment, since the LDET (B) terminal is arranged at the most tip in the mounting direction, the LDE
The T(B) terminal wears the least. As a result, the LDET (B) terminal and the LDET (L) terminal are in good contact with each other, and there is little possibility of erroneously detecting attachment/detachment of the interchangeable lens 3 .

As described above, in this embodiment, CLK (
The B) terminal and the HCLK(B) terminal are arranged at positions away from the VBAT(B) terminal. In other words, the VBAT (B) terminal is placed second from the tip side in the mounting direction, and the CLK (B) terminal and HC
The LK (B) terminal is arranged on the rear end side away from the VBAT (B) terminal. Therefore, CLK(B
) terminal and HCLK(B) terminal are subject to more wear than the LDET(B) terminal and VBAT(B) terminal. In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged immediately adjacent to the first body-side claw portion 29a. That is, the CLK(B) terminal and HCLK(B)
The terminal is arranged at a position closer to the inner peripheral edge, which is the inner peripheral edge of the first body-side claw portion 29a, than the VBAT (B) terminal. In other words, the distance between the CLK (B) terminal and the inner peripheral edge of the first body-side claw portion 29a is shorter than the distance between the VBAT (B) terminal and the inner peripheral edge of the first body-side claw portion 29a.
The distance between the HCLK (B) terminal and the inner peripheral edge of the first body-side claw portion 29a is shorter than the distance between the VBAT (B) terminal and the inner peripheral edge of the first body-side claw portion 29a. As mentioned above, the body side first
A first plate spring 41a is provided on the back side of the claw portion 29a, and the first plate spring 41a presses the first lens-side claw portion 39a in the +Z direction (FIG. 1). From the viewpoint of the first leaf spring 41a, CLK (
B) Distance between terminal and first leaf spring 41a, and HCLK (B) terminal and first leaf spring 41a
are both shorter than the distance between the VBAT (B) terminal and the first leaf spring 41a. The LDET (B) terminal is 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 is also shorter than the distance between the LDET (B) terminal and the first plate spring 41a. Since we did this, CL
The K(B) terminal and HCLK(B) terminal are pressed against the lens-side terminal more strongly than the VBAT(B) terminal and LDET(B) terminal.

Also on the lens side, the CLK (L) terminal and HCLK (L) terminal are connected to VBAT (L)
It is arranged at a position closer to the inner peripheral edge of the first lens-side claw portion 39a than the terminal. In other words, CLK
The distance between the (L) terminal and the inner peripheral edge of the lens-side first claw portion 39a is shorter than the distance between the VBAT (L) terminal and the inner peripheral edge of the lens-side first claw portion 39a. The distance to the inner peripheral edge of the side first claw portion 39a is shorter than the distance between the VBAT (L) terminal and the inner peripheral edge of the lens side first claw portion 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the lens-side first claw portion 39a are pressed against the corresponding body-side terminals by the first plate spring 41a in the completely attached state. The LDET (L) terminal is similar to the VBAT (L) terminal. All the distances are shorter than the distance between the LDET (L) terminal and the first leaf spring 41a. Because of this configuration, the CLK(L) terminal and the HCLK(L) terminal are pressed against the body-side terminal more strongly than the LDET(L) terminal when the mounting is completed. As a result, good contact can be maintained even if the CLK (B) terminal and the HCLK (B) terminal wear out, and the respective clock signals are stabilized, enabling stable data communication. Also, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while maintaining the attached state, the contact between the CLK(B) terminal and the CLK(L) terminal and the HCLK(B) terminal and the HCLK(L) terminal contact is maintained.

Even if a part of the lens-side first claw portion 39a is cut away, the body-side first claw portion 2
The entirety including the protruding portion and the notched portion arranged in the region facing the 9a is defined as the lens-side first claw portion. As for the method of notching, the lens side claw portion may be notched so as to be divided into two or more parts in the circumferential direction, the lens side claw portion may be partially cut out, or the lens side claw portion may be cut out. At least a portion may be cut out so as to shorten the length in the radial direction. Also, the circumferential length of the lens-side claw portion may be changed within a range in which it passes through the corresponding body-side insertion/extraction portion. The same applies to the second lens-side claw portion 39b, the third lens-side claw portion 39c, and the fourth lens-side claw portion 39d.
Moreover, the thickness of the cylindrical portion in the radial direction can be changed as appropriate, and the shape may be such that at least a portion of the cylindrical portion protrudes inward from the cylindrical portion of the present embodiment.

As described above, the CLK(B) terminal and the HCLK(B) terminal wear more than the LDET(B) terminal and the VBAT(B) terminal. In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are arranged immediately adjacent to the first body-side claw portion 29a. That is, CL
The K(B) terminal and the HCLK(B) terminal are arranged at positions closer to the inner peripheral edge of the first body-side claw portion 29a than the LDET(B) terminal and the VBAT(B) terminal. In other words, CLK(B)
The distance between the terminal and the inner peripheral edge of the first body-side claw portion 29a is the LDET (B) terminal or the VBAT (B) terminal.
The distance between the terminal and the inner peripheral edge of the first body-side claw portion 29a is shorter than the distance between the HCLK (B) terminal and the inner peripheral edge of the first body-side claw portion 29a. It is shorter than the distance between the terminal and the inner peripheral edge of the first body-side claw portion 29a. As described above, the first plate spring 41a is provided on the back side of the first body-side claw portion 29a, and the first plate spring 41a causes the first lens-side claw portion 3 to move.
9a is pressed in the +Z direction (Fig. 1). From the viewpoint of the first leaf spring 41a, CLK(B)
The distance between the terminal and the first leaf spring 41a and the distance between the HCLK (B) terminal and the first leaf spring 41a are all different from the distance between the LDET (B) terminal and the VBAT (B) terminal and the first leaf spring 41a. less than the distance of

Also on the lens side, the CLK (L) terminal and HCLK (L) terminal are connected to LDET (L)
It is arranged at a position closer to the inner peripheral edge of the first lens-side claw portion 39a than the terminal and the VBAT(L) terminal. In other words, the distance between the CLK (L) terminal and the inner peripheral edge of the first lens-side claw portion 39a is LDET
(L) terminal or VBAT (L) terminal and the inner peripheral edge of the first lens side claw portion 39a, and the distance between the HCLK (L) terminal and the inner peripheral edge of the first lens side claw portion 39a is LDET (L)
It is shorter than the distance between the terminal or the VBAT (L) terminal and the inner peripheral edge of the lens-side first claw portion 39a. Therefore, the CLK(L) terminal and the HCLK(L) terminal near the first lens-side claw portion 39a are pressed against the corresponding body-side terminals by the first plate spring 41a. Since this is done, the CLK(B) terminal and the HCLK(B) terminal are connected to the LDET(B) terminal and the VBAT terminal.
(B) The lens side terminal is pressed more strongly than the terminal. As a result, the CLK (B) terminal and H
Even if the CLK (B) terminal wears out, good contact can be maintained and stable communication can be performed. Further, for example, even if an impact is applied to the camera body 2 or the interchangeable lens 3 while maintaining the attached state, the C
Contact between the LK (B) terminal and HCLK (B) terminal and the lens side terminal is maintained.

In this embodiment, the CLK(B) terminal and the HCLK(B) terminal are connected to the body side fourth claw portion 2
It is also near 9d. That is, the CLK(B) terminal and HCLK(B) terminal
It is arranged at a position closer to the body-side fourth claw portion 29d than the T(B) terminal and the LDET(B) terminal. In other words, the distance between the CLK (B) terminal and the body side fourth claw portion 29d is shorter than the distance between the VBAT (B) terminal or the LDET (B) terminal and the body side fourth claw portion 29d.
The distance between the K(B) terminal and the body-side fourth claw portion 29d is determined by the VBAT(B) terminal or the LDET (
B) shorter than the distance between the terminal and the body-side fourth claw portion 29d; As described above, the fourth plate spring 41d is provided on the back side of the fourth body-side claw portion 29d, and the fourth plate spring 41d presses the fourth lens-side claw portion 39d in the +Z direction (FIG. 1). Therefore, the CLK (B) terminal and the HCLK (B) terminal near the lens side fourth claw portion 39d are connected to the VBAT (B) terminal and the LDET (B) terminal by the first leaf spring 41a and the fourth leaf spring 41d. is stably and strongly pressed against the lens side terminal.

The distance between the CLK (B) terminal described above and the first body-side claw portion 29a (the same applies to the fourth body-side claw portion 29d, but will be omitted below) is one end of the first body-side claw portion 29a. CLK(
B) is the linear distance from the terminal, and may be defined by the linear distance between the other end of the first body-side claw portion 29a and the CLK (B) terminal. Alternatively, the distance between the CLK (B) terminal and the body-side first claw portion 29a described above is the body-side first claw portion 29 in the circumferential direction of the body-side mount 21.
It may be defined by the linear distance between the intermediate position of a and the CLK (B) terminal. Similarly, the distances between other body-side terminals such as the HCLK (B) terminal, VBAT (B) terminal, and LDET (B) terminal and the first body-side claw portion 29a are linear distances. Similarly, the distance between the first leaf spring 41a (fourth leaf spring 41d) and the body-side terminal is also a linear distance.

Note that the CLK (B) terminal described above and the first body-side claw portion 29a (fourth body-side claw portion 29d)
) is defined as the arc-shaped distance between one end of the body-side first claw portion 29a and the CLK (B) terminal in the circumferential direction of the body-side mount 21. Alternatively, it may be defined as the arc-shaped distance between the other end of the first body-side claw portion 29a and the CLK (B) terminal. Alternatively, the distance between the CLK (B) terminal described above and the first body-side claw portion 29a is the middle position of the first body-side claw portion 29a in the circumferential direction of the body-side mount 21 and the distance between the CLK (B) terminal and the first body-side claw portion 29a.
(B) It may be defined as an arc-shaped distance from the terminal. Similarly, the distance between other body-side terminals such as the HCLK (B) terminal, VBAT (B) terminal, and LDET (B) terminal and the first body-side claw portion 29a is also an arc-shaped distance. The distance between the first leaf spring 41a (fourth leaf spring 41d) and the body-side terminal is also an arc-shaped distance.

Although the camera body 2 has been described above, the same applies to the interchangeable lens 3 as well. In this embodiment, the CLK(L) terminal and the HCLK(L) terminal are arranged in the immediate vicinity of the first lens-side claw portion 39a. That is, the CLK (L) and HCLK (L) terminals are connected to VBAT (
The L) terminal and the LDET (L) terminal were arranged at a position closer to the lens-side first claw portion 39a. In other words, the distance between the CLK (L) terminal and the first lens-side claw portion 39a is shorter than the distance between the VBAT (L) terminal or the LDET (L) terminal and the first lens-side claw portion 39a.
The distance between the K(L) terminal and the lens-side first claw portion 39a is determined by the VBAT(L) terminal or the LDET (
L) Shorter than the distance between the terminal and the first lens-side claw portion 39a. The lens-side first claw portion 39a is pressed in the +Z direction (FIG. 1) by the body-side first leaf spring 41a. Therefore, similarly to the above, the CLK (L) terminal and the HCLK (L) terminal near the lens-side first claw portion 39a are connected to the body more than the VBAT (L) terminal or the LDET (L) terminal by the first leaf spring 41a. It is strongly pressed against the side terminal.

In this embodiment, as shown in FIG. 5(a), the CLK(B) terminal and HCLK(B)
The terminals are arranged inside a fan shape (within an angle of 50) formed by the central position of the opening of the mount 21 (that is, the position of the optical axis O of the interchangeable lens 3) and the arcuate body-side first claw portion 29a. .
Alternatively, the CLK (B) terminal and the HCLK (B) terminal are connected to the center position of the opening of the mount 21 (that is, the position of the optical axis O of the interchangeable lens 3) and both ends of the inner peripheral side of the first body-side claw portion 29a. placed inside the triangular area formed. Therefore, the body-side first claw portion 29a does not exist on the extension line of the dashed line 51 connecting the center position of the opening of the mount 21 and the LDET (B) terminal, but the center position of the opening of the mount 21 and HCLK (B) A dashed line 52 connecting the terminals
The body-side first claw portion 29a exists on the extension line of , and the center position of the opening of the mount 21 and CL
The body-side first hook portion 29a is present on an extension of the dashed line 53 connecting the K(B) terminal.
As a result, the CLK(B) terminal and the HCLK(B) terminal are set to L in the mounting completion state.
It is pressed more strongly against the corresponding lens-side terminal than the DET(B) terminal.

As shown in FIG. 6, the CLK(L) terminal and the HCLK(L) terminal are connected to the central position of the opening of the mount 31 (that is, the position of the optical axis O of the interchangeable lens 3) and the arcuate lens-side first claw portion 39.
It was arranged inside the fan shape (range of angle 60) formed by a. Alternatively, the CLK (L) terminal and HCLK (L) terminal may be positioned at the center position of the opening of the mount 31 (that is, the interchangeable lens 3
position of the optical axis O) and both ends on the outer peripheral side of the first lens-side claw portion 39a. Therefore, the lens-side first claw portion 39a does not exist on the extended line of the dashed-dotted line 61 connecting the center position of the opening of the mount 31 and the LDET (L) terminal.
The lens-side first claw portion 39a exists on an extension of the dashed line 62 connecting the center position of the opening of the mount 31 and the HCLK (L) terminal, and a point connecting the center position of the opening of the mount 31 and the CLK (L) terminal. A lens-side first claw portion 39 a exists on an extension line of the dashed line 63 . As a result, in the mounting completion 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 HCLK
The (L) terminal receives a stronger force than the LDET (L) terminal to press against the body side terminal.
Therefore, even if the tips of the CLK(B) terminal and the HCLK(B) terminal are worn,
Communication of the clock signal between the camera body 2 and the interchangeable lens 3 is performed stably.

In this embodiment, the CLK(B) terminal, CLK(L) terminal, HCLK(B) terminal, H
The CLK (L) terminal has been explained, but the HDATA (B
) terminal, HDATA (L) terminal, DATAL (B) terminal, DATAL (L) terminal, DAT
The same applies to the AB (B) terminal and the DATAB (L) terminal. That is, HDATA(B
) terminal, DATA(B) terminal, and DATAB(B) terminal are connected to LDET(B) terminal, VBAT
(B) It is arranged at a position closer to the body-side first claw portion 29a and the first plate spring 41a than the terminal (the distance is short). As a result, the HDATA(B) terminal, DATA(B) terminal, and DATAB(B) terminal are pressed against the lens-side terminal more strongly than the VBAT(B) terminal and LDET(B) terminal. Good contact can be maintained. Also, HDATA (
LDET (L) terminal, VBA
It is arranged at a position closer to the lens-side first claw portion 39a than the T(L) terminal (the distance is short).
. Since this is done, the HDATA (L) terminal, DATAL (L) terminal, DATAB (L) terminal
) terminal is 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.

(Second embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the second embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 7 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the second embodiment. As shown in FIG. 7, in the interchangeable lens 3 according to the second embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a VBA
T (L) terminal, PGND (L) terminal, V33 (L) terminal, RDY (L) terminal, DATAB
(L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and H
It has a DATA (L) terminal. However, the interchangeable lens 3 according to the second embodiment does not have the GND (L) terminal of the interchangeable lens 3 according to the first embodiment.

Therefore, in the interchangeable lens 3 according to the second embodiment, the PGND (L) terminal is used as the ground potential (ground) of the power supply voltage of the driving system and is connected to each part such as the lens side control part 33. It is used as the ground potential (ground) of the power supply voltage of the circuit system. V.
A bypass capacitor C2 is connected between the 33 (L) terminal and the PGND (L) terminal.

The connection and configuration of each terminal other than the PGND (L) terminal of the interchangeable lens 3 according to the second embodiment are the same as those of the interchangeable lens 3 according to the first embodiment, and the example shown in FIG. , LDET (L), VBAT (L), PGND (L
), V33(L), RDY(L), DATAB(L), CLK(L), DATAL(L)
, HCLK(L), and HDATA(L) are arranged.

(Third Embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the third embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 8 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the third embodiment. As shown in FIG. 8, in the interchangeable lens 3 according to the third embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a VBA
T (L) terminal, V33 (L) terminal, GND (L) terminal, RDY (L) terminal, DATAB (
L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HD
It has an ATA (L) terminal. However, the interchangeable lens 3 according to the third embodiment does not have the PGND (L) terminal of the interchangeable lens 3 according to the first embodiment.

Therefore, in the interchangeable lens 3 according to the third embodiment, the GND (L) terminal is used as the ground potential (ground) of the power supply voltage of the circuit system, and is connected to each part such as the driving part 37, It is also used as the ground potential (ground) for the power supply voltage of the driving system. VBAT(
A bypass capacitor C1 is connected between the L) terminal and the GND (L) terminal.
A bypass capacitor C2 is connected between the (L) terminal and the GND (L) terminal.

The connection and configuration of each terminal other than the GND (L) terminal of the interchangeable lens 3 according to the third embodiment are the same as those of the interchangeable lens 3 according to the first embodiment, and the example shown in FIG. Similarly, in the lens side terminal holding portion 32, LDET (L), VBAT (L), V33 (L),
GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), H
CLK(L) and HDATA(L) terminals are arranged.

(Fourth embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the fourth embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 9 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the fourth embodiment. As shown in FIG. 9, in the interchangeable lens 3 according to the fourth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a VBA
T (L) terminal, PGND (L) terminal, GND (L) terminal, RDY (L) terminal, DATAB
(L) terminal, CLK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and H
It has a DATA (L) terminal. However, the interchangeable lens 3 according to the fourth embodiment does not have the V33(L) terminal of the interchangeable lens 3 according to the first embodiment, and the lens side controller 33
etc. is not supplied from the camera body 2 .

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

The connection and configuration of each terminal other than the VBAT(L) terminal of the interchangeable lens 3 according to the fourth embodiment are the same as those of the interchangeable lens 3 according to the first embodiment, and the example shown in FIG. , LDET (L), VBAT (L), PGND (L
), GND(L), RDY(L), DATAB(L), CLK(L), DATA(L)
, HCLK(L), and HDATA(L) are arranged.

(Fifth embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the fifth embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 10 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the fifth embodiment. As shown in FIG. 10, in the interchangeable lens 3 according to the fifth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a P
GND (L) terminal, V33 (L) terminal, GND (L) terminal, RDY (L) terminal, DATA
It has a B(L) terminal, a CLK(L) terminal, a DATAL(L) terminal, an HCLK(L) terminal, and an HDATA(L) terminal. However, the interchangeable lens 3 according to the fifth embodiment
The interchangeable lens 3 according to the first embodiment does not have the VBAT (L) terminal, and the camera body 2 does not supply power for the drive system to the drive unit 37 or the like.

Therefore, the interchangeable lens 3 according to the fifth embodiment includes a DC/DC converter 51. FIG. The DC/DC converter 51 is, for example, a step-up voltage conversion circuit, and is connected to the V33 (L) terminal and the driving section 37 . The DC/DC converter 51 converts the power supply voltage supplied from the camera body 2 via the V33 (L) terminal, and supplies power to the drive system circuits such as the drive unit 37 . Wiring and P
A bypass capacitor C1 is connected between the GND (L) terminals.

The connection and configuration of each terminal other than the V33(L) terminal of the interchangeable lens 3 according to the fifth embodiment are the same as those of the interchangeable lens 3 according to the first embodiment, and the example shown in FIG. Similarly, in the lens-side terminal holding portion 32, LDET (L), PGND (L), V33 (L),
GND (L), RDY (L), DATAB (L), CLK (L), DATAL (L), H
CLK(L) and HDATA(L) terminals are arranged.

(Sixth embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the sixth embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 11 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the sixth embodiment. As shown in FIG. 11, in the interchangeable lens 3 according to the sixth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a V
BAT (L) terminal, PGND (L) terminal, RDY (L) terminal, DATAB (L) terminal, C
LK (L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L)
have terminals. However, the interchangeable lens 3 according to the sixth embodiment does not have the V33 (L) terminal and the GND (L) terminal of the interchangeable lens 3 according to the first embodiment, and the lens-side control unit 33 and the like are provided. is not supplied from the camera body 2.

For this reason, the interchangeable lens 3 according to the sixth embodiment includes a DC/DC converter 52 . DC/DC converter 52 is, for example, a step-down voltage conversion circuit, and VBAT (L)
It is connected to the terminal and the lens side control section 33 . The DC/DC converter 52 is VBAT (L
) terminal, the power supply voltage supplied from the camera body 2 is converted into voltage, and power is supplied to the lens-side control unit 33 and the like.

In the interchangeable lens 3 according to the sixth embodiment, the PGND (L) terminal is used as a ground potential (ground) for the power supply voltage of the driving system, and is connected to each part such as the lens side control part 33. , is used as the ground potential (ground) of the power supply voltage of the circuit system. DC/
A bypass capacitor C2 is connected between the wiring for power supply from the DC converter 52 to the lens side control unit 33 and the like and the PGND (L) terminal.

The connection and configuration of each terminal other than the VBAT (L) terminal and the PGND (L) terminal of the interchangeable lens 3 according to the sixth embodiment are the same as those of the interchangeable lens 3 according to the first embodiment. As in the example shown in FIG. 6 , LDET (L), VBA
T (L), PGND (L), RDY (L), DATAB (L), CLK (L), DATA
Terminals L(L), HCLK(L), and HDATA(L) are arranged.

(Seventh embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the seventh embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 12 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the seventh embodiment. As shown in FIG. 12, in the interchangeable lens 3 according to the seventh embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a V
BAT (L) terminal, GND (L) terminal, RDY (L) terminal, DATAB (L) terminal, CL
It has a K(L) terminal, DATAL(L) terminal, HCLK(L) terminal, and HDATA(L) terminal. However, the interchangeable lens 3 according to the seventh embodiment does not have the PGND (L) terminal and the V33 (L) terminal of the interchangeable lens 3 according to the first embodiment, and the lens side control unit 33 and the like are not provided. is not supplied from the camera body 2.

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

Further, in the interchangeable lens 3 according to the seventh embodiment, the GND (L) terminal is used as the ground potential (ground) of the power supply voltage of the circuit system, and is connected to each part such as the driving part 37 to It is also used as the ground potential (ground) for the power supply voltage of the system. V BAT (L)
A bypass capacitor C1 is connected between the terminal and the GND (L) terminal to provide a DC/DC
A bypass capacitor C2 is connected between the power supply wiring from the converter 53 to the lens side control unit 33 and the like and the GND (L) terminal.

The connection and configuration of each terminal other than the VBAT (L) terminal and the GND (L) terminal of the interchangeable lens 3 according to the seventh embodiment are the same as those of the interchangeable lens 3 according to the first embodiment.
As in the example shown in FIG. 6, LDET(L), VBAT
(L), GND (L), RDY (L), DATAB (L), CLK (L), DATA (
L), HCLK(L), and HDATA(L) terminals are arranged.

(Eighth embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the eighth embodiment will be explained. The description of the configuration common to the above-described first embodiment is omitted. FIG. 13 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the eighth embodiment. As shown in FIG. 13, in the interchangeable lens 3 according to the eighth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a P
GND (L) terminal, V33 (L) terminal, RDY (L) terminal, DATAB (L) terminal, CL
It has a K(L) terminal, DATAL(L) terminal, HCLK(L) terminal, and HDATA(L) terminal. However, the interchangeable lens 3 according to the eighth embodiment does not include the VBAT (L) terminal and the GND (L) terminal of the interchangeable lens 3 according to the first embodiment, and The camera body 2 does not supply the power for the drive system for this.

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

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

The connection and configuration of each terminal other than the PGND (L) terminal and the V33 (L) terminal of the interchangeable lens 3 according to the eighth embodiment are the same as those of the interchangeable lens 3 according to the first embodiment.
As in the example shown in FIG. 6, LDET (L), PGND
(L), V33 (L), RDY (L), DATAB (L), CLK (L), DATA (
L), HCLK(L), and HDATA(L) terminals are arranged.

(Ninth embodiment)
Next, the interchangeable lens 3 of the camera system 1 according to the ninth embodiment will be described. The description of the configuration common to the above-described first embodiment is omitted. FIG. 14 is a circuit diagram schematically showing electrical connections between the camera body 2 and the interchangeable lens 3 according to the ninth embodiment. As shown in FIG. 14, in the interchangeable lens 3 according to the ninth embodiment, similarly to the interchangeable lens 3 according to the first embodiment, the lens-side terminal holding portion 32 includes an LDET (L) terminal, a V
33 (L) terminal, GND (L) terminal, RDY (L) terminal, DATAB (L) terminal, CLK
(L) terminal, DATAL (L) terminal, HCLK (L) terminal, and HDATA (L) terminal. However, the interchangeable lens 3 according to the ninth embodiment does not have the VBAT (L) terminal and the PGND (L) terminal of the interchangeable lens 3 according to the first embodiment. The camera body 2 does not supply the power for the drive system for this.

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

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

The connection and configuration of each terminal other than the V33 (L) terminal and the GND (L) terminal of the interchangeable lens 3 according to the ninth embodiment are the same as those of the interchangeable lens 3 according to the first embodiment. LDET (L), V33 (L
), GND(L), RDY(L), DATAB(L), CLK(L), DATA(L)
, HCLK(L), and HDATA(L) are arranged.

Similar to the first embodiment, the second to ninth embodiments also have the effect of suppressing the influence of various noises as described below. The RDY terminal is connected to the VBAT terminal, which is a noise source, and the HCL
It was spaced apart so as not to be adjacent to any of the K terminals. As a result, it is possible to suppress the influence of noise on the RDY terminal used to indicate whether or not command communication is possible.
In addition, the HCLK terminal, which is a noise source, is sandwiched between the HDATA terminal and the DATAL terminal.
The K 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 arranged in order from the rear end in the mounting direction. As a result, the influence of noise caused by the clock signal to the RDY terminal or the like can be suppressed.
Furthermore, in consideration of the influence of noise, the terminal group for power supply and the terminal group used for communication are separated from each other with the RDY terminal interposed therebetween. More specifically, the VBAT terminal, the PGND terminal, the V33 terminal, and the GND terminal, which are power supply terminals, are arranged in order from the tip side on the front end side in the mounting direction across the RDY terminal, and the terminals for communication are arranged on the rear end side in the mounting direction. DATAB terminal, CLK terminal,
The DATAL terminal, HCLK terminal, and HDATA terminal are arranged in order from the tip side. As a result, it is possible to suppress the influence of the power supply terminal group such as the VBAT terminal on the terminals used for communication. In addition, it is possible to suppress the influence of noise on the power supply terminal group such as the VBAT terminal and the RDY terminal of the terminal group used for communication such as the HCLK terminal and the CLK terminal.

An HCLK terminal to which a clock signal (H clock signal) used for hotline communication is sent, and a CLK terminal to which a clock signal (C clock signal) used for command data communication is sent.
In terms of terminals, the HCLK terminal is located farther from the VBAT terminal than the CLK terminal.
This is because the clock signal (C clock signal) sent to the interchangeable lens through the CLK terminal is output by the body side control section 23 via the body side communication section 24, but the interchangeable lens is transmitted to the lens side communication section 3
If the clock signal (H clock signal) sent to the camera body via the HCLK (L) terminal via 4 is mixed with noise, the body-side control unit 23 misrecognizes the clock signal (H clock signal) of the HCLK terminal. This is because noise has a greater influence on the camera system 1 .
As for the HCLK terminal and the GND terminal, the HCLK terminal is located farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. This can shield noise caused by the VBAT terminal to the HCLK terminal to which the clock signal (H clock signal) used for hot line communication is sent.
As for the CLK terminal and the GND terminal, the CLK terminal is arranged at a position farther from the VBAT terminal than the GND terminal. Furthermore, a PGND terminal is arranged between the GND terminal and the VBAT terminal. As a result, noise caused by the VBAT terminal to the CLK terminal to which the clock signal (C clock signal) used for command data communication is sent can be shielded.

The following modifications are also possible, and it is also possible to combine one or more modifications with the above-described embodiment.
(Modification 1)
Connect the interchangeable lens 3 to either terminal used for command data communication or hotline communication.
may also have a function of transmitting a power-on signal from to the camera body 2 . For example, the interchangeable lens 3 is provided with a power switch function. Even when the interchangeable lens 3 is in the attached state and the camera system 1 is in the power off state, the power supply unit 26 supplies power from the V33(B) terminal to the lens-side control unit 33 of the interchangeable lens 3 . When the power switch of the interchangeable lens 3 is operated, the lens-side control section 33 outputs a power-on signal to the RDY(L) terminal via the lens-side communication section 34, for example. When the body-side control unit 23 detects a power-on signal via the RDY (B) terminal via the body-side communication unit 24, the power switch (not shown) provided on the camera body 2 is operated in the same manner as when the power switch (not shown) is operated. , the camera system 1 transitions from the power-off state to the power-on state.

(Modification 2)
In the embodiment, the DATAB (B) terminal is arranged on the front end side of the CLK (B) terminal in the mounting direction, and the DATA (B) terminal is arranged on the rear end side. can be replaced. That is, from the tip side in the mounting direction, the DATA (B) terminal, C
The LK(B) terminal and the DATAB(B) terminal may be arranged in this order.

Further, for each terminal of the lens-side terminal group described in each of the above-described embodiments, L
The DET (L) terminal may be called a detection terminal. Also, the VBAT(L) terminal may be referred to as a power supply terminal or a first power supply terminal. Also, the PGND (L) terminal may be called a ground terminal or a first ground terminal. In addition, the V33(L) terminal may be referred to as a power supply terminal or a second power supply terminal. Also, the GND (L) terminal may be referred to as a ground terminal or a second ground terminal. Also, RD
The Y(L) terminal may be called a ready terminal. Also, the DATAB(L) terminal may be called a data terminal or a first data terminal. Also, the CLK (L) terminal may be called a clock terminal or a first clock terminal. Also, the DATAL (L) terminal may be called a data terminal or a second data terminal. Also, the HCLK (L) terminal may be called a clock terminal or a second clock terminal. Also, the HDATA (L) terminal may be called a data terminal or a third data terminal.

In the above embodiment, the interchangeable lens of the camera was described as an example of the accessory, but the accessory is not limited to the interchangeable lens. For example, it may be a teleconverter, a wide converter, or a close-up ring that is mounted between the camera body and the interchangeable lens to change the focal length of the interchangeable lens. Alternatively, it can be applied to a mount adapter or the like that enables attachment of an accessory including an interchangeable lens of a mount standard other than the mount standard of the camera body described above. In other words, it can be applied to any accessory that is attached to a camera body mount. In this case, the lens-side terminal group, the lens-side claw portion 39, the lens-side communication portion 34, and the like correspond to the accessory-side terminal group, the accessory-side projecting portion, the accessory-side communication portion, and the like of each accessory. In the above embodiment, the accessory is detachable from the camera body. However, the camera body is a mount adapter that allows an interchangeable lens with the mount standard described above to be attached to a camera body different from the mount standard described above. Alternatively, the mount adapter may be configured so that the above accessories can be attached thereto.

DESCRIPTION OF SYMBOLS 1... Camera system, 2... Camera body, 3... Interchangeable lens, 21... Body side mount, 2
2... Body-side terminal holding portion 31... Lens-side mount 32... Lens-side terminal holding portion

Claims (10)

An accessory that is attachable to and detachable from a camera body and includes a plurality of terminals that come into contact with a plurality of terminals that the camera body has,
at least one power terminal to which a power supply voltage is supplied from the camera body;
at least one ground terminal in contact with the ground terminal provided in the camera body and used as a ground potential;
a detection terminal that is different from the power supply terminal and the ground terminal and is used for detecting attachment/detachment of the interchangeable lens to/from the camera body;
a first communication terminal group used for bidirectional first communication with the camera body;
a second communication terminal group that communicates independently of the first communication and is used for one-way second communication to the camera body;
has
different from the number of power supply terminals and the number of ground terminals,
the detection terminal is arranged on the outermost side of a plurality of terminals contacting a plurality of terminals provided on the camera body ;
The power terminal is arranged farther from the second communication terminal group than the first communication terminal group,
The first communication terminal group has a first terminal to which a first clock signal is input from the camera body, and a second terminal to which first data is output in synchronization with the first clock signal. ,
The second communication terminal group includes a third terminal for outputting a second clock signal to the camera body, and a fourth terminal for outputting second data in synchronization with the second clock signal .
accessory. The accessory of claim 1, comprising:
An accessory wherein a plurality of terminals comprising said at least one power terminal and said at least one ground terminal are arranged adjacent to each other. The accessory of claim 1, wherein
An accessory wherein the number of power terminals is less than the number of ground terminals. The accessory of claim 1, wherein
The accessory wherein the number of said ground terminals is less than the number of said power terminals. An accessory according to claim 1 or 4,
a first power terminal, which is the power terminal, to which a first power voltage is supplied;
a second power supply terminal to which a second power supply voltage different from the first power supply voltage is supplied;
a first ground terminal that is the ground terminal;
a first circuit unit to which the first power supply voltage is supplied via the first power supply terminal;
a second circuit unit to which the second power supply voltage is supplied via the second power supply terminal;
The first ground terminal is an accessory used as a ground potential for the first circuit section and the second circuit section. 4. The accessory according to claim 1 or 3,
a first power terminal, which is the power terminal, to which a first power voltage is supplied;
a first ground terminal that is the ground terminal;
a second ground terminal that is the ground terminal;
a voltage conversion circuit that converts the first power supply voltage to a second power supply voltage;
a first circuit unit to which the first power supply voltage is supplied via the first power supply terminal;
a second circuit unit to which the second power supply voltage converted by the voltage conversion circuit is supplied;
The first ground terminal is used as a ground potential of the first circuit section,
The second ground terminal is an accessory used as a ground potential of the second circuit section. An accessory according to claim 5 or 6,
having a moving driven part,
The first circuit unit drives the driven unit,
The second circuit unit is an accessory that controls driving of the driven unit. An accessory according to claim 5 or 6 ,
having a moving driven part,
The first circuit unit drives the driven unit,
The second circuit unit is an accessory that controls communication via the first communication terminal group and the second communication terminal group. An accessory according to claim 7 or 8 ,
An optical system that has an aperture that can adjust the amount of light from the subject and a focusing lens that adjusts the imaging position of the subject, and an optical system that forms an image of the subject,
An accessory in which the driven part is at least one of the diaphragm and the focusing lens. An accessory according to any one of claims 1 to 9 ,
Accessories that are interchangeable lenses.

Images