JP2012203020A - Interchangeable lens and camera system - Google Patents

Abstract

Provided are an interchangeable lens and a camera system that can change a power supply state by an operation member on the interchangeable lens side without using a mechanical connection switching mechanism and with low power consumption.
An interchangeable lens comprising power receiving means capable of receiving a first output current from a camera body when the camera body is in a power-off state and a second output current larger than the first output current when the camera is in a power-on state. And the camera body is in a power-off state having a first operation state that operates with a first consumption current, a second operation state that operates with a second consumption current, and a third operation state that operates with a third consumption current At the time of operation in the first operation state, the second operation state is entered in response to detection of the operation of the operation member, and the first signal is sent to the camera body in response to the interchangeable lens entering the second operation state. And an interchangeable lens that enters the third operating state in response to the input of the second signal when in the second operating state.
[Selection] Figure 2

Description

  The present invention relates to an interchangeable lens and a camera system.

  2. Description of the Related Art Conventionally, a camera system including an interchangeable lens and a camera body is known that can change the power state of the camera body by an operation member provided on the interchangeable lens. For example, in Patent Document 1, when power is supplied from a camera, the switch on the interchangeable lens side and the lens MPU are connected, and when the power supply from the camera is cut off, the switch on the interchangeable lens side is connected to the camera MPU. A single-lens reflex camera connected to is described.

JP 2009-186545 A

  The mechanism for mechanically switching the connection of the operation members as in the prior art leads to an increase in the number of parts and a complicated and enlarged circuit. On the other hand, if power supply to the interchangeable lens is continued in order to detect the operation of the operation member, there is a problem that power consumption increases.

According to a first aspect of the present invention, there is provided attachment means for detachably attaching the camera body, a first output current when the camera body is in a power-off state, and a first output current larger than the first output current when the camera body is in a power-on state. Power receiving means capable of receiving two output currents from the camera body, an operating member, a detecting means for detecting operation of the operating member, and a lens side communication means capable of transmitting and receiving signals between the camera body, The interchangeable lens includes a first operating state in which the interchangeable lens operates with a first consumption current smaller than the first output current, and a second consumption current that is greater than the first consumption current but less than or equal to the first output current. A second operating state, and a third operating state that operates with a third current consumption that is greater than the first output current but less than or equal to the second output current, and the interchangeable lens has a camera body in a power-off state. At this time, it operates in the first operation state and enters the second operation state in response to detection of the operation of the operation member by the detection means, and the lens side communication means has the interchangeable lens in the second operation state. Accordingly, a first signal indicating an instruction to change the state to the power-on state is output to the camera body, and when the interchangeable lens is in the second operation state, the camera body is turned on by the first signal. The interchangeable lens is characterized in that it enters the third operation state in response to the second signal representing the input to the lens side communication means.
The invention according to claim 6 is a camera system comprising a camera body and an interchangeable lens that can be attached to and detached from the camera body, wherein the camera body includes a power source that is a power supply source to the camera body and the interchangeable lens, State switching means for switching between a power-off state and a power-on state of the camera body, a first output current when the camera body is in a power-off state, and a second output current greater than the first output current when the camera body is in a power-on state Are provided with power supply means capable of supplying each of the interchangeable lenses and body side communication means capable of transmitting / receiving signals to / from the interchangeable lenses, and the interchangeable lenses detect the operation member and the operation of the operation member. And a lens side communication unit capable of transmitting and receiving signals between the camera body and the interchangeable lens with a first consumption current smaller than the first output current. A first operating state to operate, a second operating state to operate with a second consumption current greater than the first consumption current but less than the first output current, and a greater than first output current but less than the second output current. The interchangeable lens operates in the first operation state when the camera body is in a power-off state, and the operation of the operation member is detected by the detection means. Accordingly, the second operation state is entered, the lens side communication means outputs a first signal to the body side communication means in response to the interchangeable lens being in the second operation state, and the state switching means is The camera body is switched to the power-on state in response to the signal input, and the body side communication means outputs the second signal to the lens side communication means in response to the power supply means being able to supply the second output current. The interchangeable lens is in the second operating state When a camera system characterized by comprising a third operational state in accordance with input of the second signal.

  According to the present invention, it is possible to change the power state by the operation member on the interchangeable lens side without using a mechanical connection switching mechanism and with low power consumption.

It is the perspective view which showed the lens-interchangeable camera system to which this invention is applied. It is sectional drawing which showed the lens-interchangeable camera system to which this invention is applied. It is a schematic diagram which shows the detail of the holding parts 102 and 202. FIG. It is a timing chart which shows the example of command data communication. It is a timing chart which shows the example of hotline communication. 3 is a block diagram illustrating details of a power transmission unit 130 and a power reception unit 230. FIG. 6 is a timing chart showing how the camera body 100 is turned on when a button 107 is pressed. 6 is a timing chart showing how the camera body 100 is turned on when a button 207 is pressed.

(First embodiment)
FIG. 1 is a perspective view showing an interchangeable lens type camera system to which the present invention is applied. FIG. 1 shows only devices and apparatuses according to the present invention, and illustration and description of other devices and apparatuses are omitted. The camera 1 includes a camera body 100 and an interchangeable lens 200 that can be attached to and detached from the camera body 100.

  The camera body 100 is provided with a lens mount 101 to which the interchangeable lens 200 is detachably attached. At a position near the lens mount 101 of the camera body 100 (inner peripheral side of the lens mount 101), a holding part (electrical connection) that holds a contact in a state of partially protruding toward the inner peripheral side of the lens mount 101 Part) 102 is provided. The holding portion 102 is provided with a plurality of contacts.

  The interchangeable lens 200 is provided with a lens mount 201 to which the camera body 100 is detachably attached corresponding to the lens mount 101 on the body side. At a position near the lens mount 201 of the interchangeable lens 200 (inner peripheral side of the lens mount 201), a holding portion (electrical connection) that holds a contact in a state of partially protruding toward the inner peripheral side of the lens mount 201 Part) 202 is provided. The holding portion 202 is provided with a plurality of contacts.

  When the interchangeable lens 200 is attached to the camera body 100, the holding unit 102 provided with a plurality of contacts is electrically and physically connected to the holding unit 202 provided with a plurality of contacts. Both holders 102 and 202 are used for power supply from the camera body 100 to the interchangeable lens 200 and transmission / reception of signals between the camera body 100 and the interchangeable lens 200.

  An imaging element 104 such as a CMOS or CCD is provided behind the lens mount 101 in the camera body 100. Above the camera body 100, a button 107 serving as an input device is provided. When the camera body 100 is in a power-off state, when the user presses the button 107, the camera body 100 is in a power-on state. A button 207 similar to the button 107 is also provided on the side surface of the lens barrel of the interchangeable lens 200. When the camera body 100 is in the power-off state, when the user presses the button 207 of the interchangeable lens 200 attached to the camera body 100, the camera body 100 is in the power-on state.

  FIG. 2 is a cross-sectional view showing an interchangeable lens type camera system to which the present invention is applied. The interchangeable lens 200 includes an imaging optical system 210 that forms a subject image. The imaging optical system 210 includes a plurality of lenses 210 a to 210 c and a diaphragm 211. The plurality of lenses 210a to 210c include a focusing lens 210b for controlling the focus position of the subject image and a shake correction lens 210c for correcting image blur of the subject image.

  Inside the interchangeable lens 200, a lens control unit 203 that controls each part of the interchangeable lens 200 is provided. The lens control unit 203 includes a microcomputer (not shown) and its peripheral circuits. The lens control unit 203 includes a lens side first communication unit 217, a lens side second communication unit 218, a focusing lens driving unit 212, a shake correction lens driving unit 213, an aperture driving unit 214, a ROM 215, a RAM 216, and a power receiving unit 230. It is connected. A button 207 shown in FIG. 1 is further connected to the lens control unit 203, and the lens control unit 203 can detect a pressing operation of the button 207.

  The lens-side first communication unit 217 and the lens-side second communication unit 218 are configured to be able to exchange signals with the camera body 100 via the communication contacts of the holding units 102 and 202. The lens side first communication unit 217 and the lens side second communication unit 218 are communication interfaces on the interchangeable lens 200 side, respectively. The lens control unit 203 performs data communication (hotline communication, command data communication) described later with the camera body 100 (a body control unit 103 described later) using these communication interfaces. The power receiving unit 230 receives the operating current of each unit including the lens control unit 203 from the camera body 100 through the power supply contact of the holding units 102 and 202 from the camera body 100.

  The focusing lens driving unit 212 includes an actuator such as a stepping motor, for example, and drives the focusing lens 210b in accordance with a signal input to the focusing lens driving unit 212. Similarly, the blur correction lens driving unit 213 and the diaphragm driving unit 214 have actuators such as a voice coil motor, for example, and drive the blur correction lens 210c and the diaphragm 211, respectively, according to an input signal. The focusing lens 210b is driven in the optical axis direction by the focusing lens driving unit 212. The shake correction lens 210c is driven in the vertical direction (X direction, Y direction) of the optical axis by the shake correction lens driving unit 213. The diaphragm 211 is driven by the diaphragm driving unit 214 so that the size of the opening (opening diameter) for passing the subject light changes.

  The ROM 215 is a non-volatile storage medium, and stores a predetermined control program executed by the lens control unit 203 in advance. The RAM 216 is a volatile storage medium and is used as a storage area for various data by the lens control unit 203.

  A shutter 115 for controlling the exposure state of the image sensor 104 and an optical filter 116 combining an optical low-pass filter and an infrared cut filter are provided on the front surface of the image sensor 104. The subject light that has passed through the imaging optical system 210 enters the image sensor 104 via the shutter 115 and the filter 116.

  Inside the camera body 100, a body control unit 103 that controls each part of the camera body 100 is provided. The body control unit 103 includes a microcomputer (not shown), a RAM, and peripheral circuits thereof. The button 107 shown in FIG. 1 is connected to the body control unit 103, and a pressing operation of the button 107 can be detected.

  A body-side first communication unit 117 and a body-side second communication unit 118 are connected to the body control unit 103. The body side first communication unit 117 and the body side second communication unit 118 are both connected to the holding unit 102, and signals can be exchanged with the interchangeable lens 200. The body side first communication unit 117 can exchange data with the lens side first communication unit 217 via a plurality of communication contacts provided in the holding unit 102. Similarly, the body side second communication unit 118 can exchange data with the lens side second communication unit 218. In other words, each of the body-side first communication unit 117 and the body-side second communication unit 118 is a body-side communication interface. The body control unit 103 performs communication (hotline communication and command data communication) described later with the interchangeable lens 200 (lens control unit 203) using these communication interfaces.

  A display device 111 configured by an LCD panel or the like is disposed on the back surface of the camera body 100. The body control unit 103 displays various menu screens for setting an image of a subject (a so-called through image) based on the output of the image sensor 104, shooting conditions, and the like on the display device 111.

(Description of holding units 102 and 202)
FIG. 3 is a schematic diagram showing details of the holding units 102 and 202. In FIG. 3, the holding portion 102 is arranged on the right side of the lens mount 101 in accordance with the actual mount structure. That is, the holding portion 102 of the present embodiment is disposed at a location deeper than the mount surface of the lens mount 101 of the camera body 100 (a location on the right side of the lens mount 101 in FIG. 3). Similarly, the holding unit 202 is arranged on the right side of the lens mount 201 because the holding unit 202 of this embodiment is arranged at a position protruding from the mount surface of the lens mount 201 of the interchangeable lens 200. Represents. Since the holding unit 102 and the holding unit 202 are arranged in this way, when the mount surface of the lens mount 101 and the mount surface of the lens mount 201 are brought into contact with each other, the camera body 100 and the interchangeable lens 200 are mounted and coupled. The holding part 102 and the holding part 202 are connected, and the electrical contacts provided in both holding parts are also connected. Since such a mount structure is well known, further explanation and illustration are omitted.

  As shown in FIG. 3, the holding unit 102 has 12 contacts BP <b> 1 to BP <b> 12. The holding unit 202 has twelve contacts LP1 to LP12 corresponding to the twelve contacts described above.

  The contact BP1 and the contact BP2 are connected to the power transmission unit 130 in the camera body 100. The power transmission unit 130 has a drive system such as an actuator at the contact point BP1 and has a relatively large power consumption (excluding the focusing lens drive unit 212, the shake correction lens drive unit 213, the aperture drive unit 214, etc.). The operating voltage of each part is supplied. That is, the operating voltage of each part in the interchangeable lens 200 excluding the above driving parts is supplied from the contact BP1 and the contact LP1. The voltage value that can be supplied to the contact point BP1 has a range between the minimum voltage value and the maximum voltage value (for example, a voltage width in the 3V range). The voltage value that is normally supplied is the maximum voltage value and the minimum voltage value. Is a voltage value in the vicinity of the intermediate value. As a result, the current value supplied from the camera body 100 side to the interchangeable lens 200 side is a current value within a range of about several tens of mA to several hundreds of mA in the power-on state.

  The contact BP2 is a ground terminal corresponding to the operating voltage given to the contact BP1. That is, the contact BP2 and the contact LP2 are ground terminal voltages corresponding to the above operating voltage. The contact LP1 and the contact LP2 are connected to the power receiving unit 230 in the interchangeable lens 200. The power receiving unit 230 supplies the power supplied from the camera body 100 to each unit in the interchangeable lens 200 including the lens control unit 203.

  In the following description, the signal line constituted by the contact point BP1 and the contact point LP1 is referred to as a signal line V33. A signal line constituted by the contact point BP2 and the contact point LP2 is referred to as a signal line GND. These contacts LP1, LP2, BP1, BP2 constitute a power supply system contact for supplying power from the camera body 100 side to the interchangeable lens 200 side.

  The contacts BP3, BP4, BP5, and BP6 are connected to the body-side first communication unit 117. The contact points LP3, LP4, LP5, and LP6 on the interchangeable lens 200 side corresponding to these contact points are connected to the lens-side first communication unit 217. The body-side first communication unit 117 and the lens-side first communication unit 217 transmit and receive data to and from each other using these contact points (communication system contact points). The contents of communication performed by the body-side first communication unit 117 and the lens-side first communication unit 217 will be described in detail later.

  In the following description, a signal line constituted by the contact BP3 and the contact LP3 is referred to as a signal line CLK. Similarly, the signal line constituted by the contact BP4 and the contact LP4 is signal line BDAT, the signal line constituted by the contact BP5 and the contact LP5 is signal line LDAT, and the signal line constituted by the contact BP6 and the contact LP6 is signaled. Called line RDY.

  The contacts BP7, BP8, BP9, and BP10 are connected to the body-side second communication unit 118. The contacts LP7, LP8, LP9, and LP10 on the interchangeable lens 200 side corresponding to these contacts are connected to the lens-side second communication unit 218. The lens-side second communication unit 218 transmits data to the body-side second communication unit 118 using these contacts (communication system contacts). The contents of communication performed by the body-side second communication unit 118 and the lens-side second communication unit 218 will be described in detail later.

  In the following description, a signal line constituted by the contact BP7 and the contact LP7 is referred to as a signal line HREQ. Similarly, a signal line composed of the contact point BP8 and the contact point LP8 is signal line HANS, a signal line composed of the contact point BP9 and the contact point LP9 is signal line HCLK, and a signal line composed of the contact point BP10 and the contact point LP10 is signaled. Called line HDAT.

  The contact BP11 and the contact BP12 are connected to the power supply circuit 140 in the camera body 100. The power supply circuit 140 supplies a driving voltage of a circuit (focusing lens driving unit 212, blur correction lens driving unit 213, aperture driving unit 214, etc.) having a driving system such as an actuator and a relatively large power consumption to the contact point BP12. . That is, the driving voltages of the focusing lens driving unit 212, the blur correction lens driving unit 213, and the aperture driving unit 214 are supplied from the contact BP12 and the contact LP12. The voltage value that can be supplied to the contact point BP12 has a range from the minimum voltage value to the maximum voltage value, all of which are larger than the voltage value range that can be supplied to the contact point BP1 (for example, The maximum voltage value that can be supplied to the contact point BP12 is several times the maximum voltage value that can be supplied to the contact point BP1). That is, the voltage value supplied to the contact point BP12 is a voltage value whose magnitude is different from the voltage value supplied to the contact point BP1. The voltage value that is normally supplied to the contact BP12 is a voltage value in the vicinity of an intermediate value between the maximum voltage value and the minimum voltage value that can be supplied to the contact BP12. As a result, the current supplied from the camera body 100 side to the interchangeable lens 200 side has a current value of about 10 mA to several A in the power-on state.

  The contact BP11 is a ground terminal corresponding to the drive voltage given to the contact BP12. That is, the contact BP11 and the contact LP11 are ground terminals corresponding to the drive voltage.

  In the following description, a signal line constituted by the contact BP11 and the contact LP11 is referred to as a signal line PGND. A signal line constituted by the contact BP12 and the contact LP12 is referred to as a signal line BAT. These contacts LP11, LP12, BP11, BP12 constitute a power supply system contact for supplying power from the camera body 100 side to the interchangeable lens 200 side.

  As is apparent from the magnitude relationship between the voltage value (current value) supplied to the contacts BP12 and LP12 and the voltage value (current value) supplied to the contacts BP1 and LP1, the voltages are supplied to the contacts. The difference between the maximum value and the minimum value of the current flowing through the contact point BP11 and the contact point LP11 serving as the ground terminals for each of the voltages is larger than the difference between the maximum value and the minimum value of the current flowing through the contact point BP2 and the contact point LP2. ing. This is because the power consumed by each drive unit having a drive system such as an actuator is larger than that of an electronic circuit such as the lens control unit 203 in the interchangeable lens 200 and it is not necessary to drive the driven member. This is because each drive unit does not consume power.

(Description of command data communication)
The lens control unit 203 controls the lens-side first communication unit 217 and receives control data from the body-side first communication unit 117 via the contacts LP3 to LP6, that is, the signal lines CLK, BDAT, LDAT, and RDY. Reception and transmission of response data to the body-side first communication unit 117 are performed in parallel at a first predetermined cycle (for example, 16 milliseconds in this embodiment). Hereinafter, details of communication performed between the lens-side first communication unit 217 and the body-side first communication unit 117 will be described.

  In the present embodiment, communication performed between the lens control unit 203 and the lens-side first communication unit 217 and the body control unit 103 and the body-side first communication unit 117 is referred to as “command data communication”. A transmission line composed of four signal lines (signal lines CLK, BDAT, LDAT, and RDY) used for command data communication is referred to as a first transmission line.

  FIG. 4 is a timing chart showing an example of command data communication. The body control unit 103 and the body-side first communication unit 117 first check the signal level of the signal line RDY at the start of command data communication (T1). The signal level of the signal line RDY indicates whether the lens-side first communication unit 217 can communicate. That is, a communication availability signal indicating availability of data communication is output from the lens side first communication unit 217 to the signal line RDY. The lens control unit 203 and the lens-side first communication unit 217 output a signal of H (High) level from the contact LP6 when communication is not possible. That is, the signal level of the signal line RDY is set to H level. When the signal line RDY is at the H level, the body control unit 103 and the body-side first communication unit 117 do not start communication until the signal line RDY is at the L level. Also, the next processing during communication is not executed.

  If the signal line RDY is at L (Low) level, the body control unit 103 and the first body side communication unit 117 output the clock signal 401 from the contact point BP3. That is, the clock signal 401 is transmitted to the first lens side communication unit 217 via the signal line CLK. In synchronization with the clock signal 401, the body control unit 103 and the body side first communication unit 117 output a body side command packet signal 402, which is the first half of the control data, from the contact point BP4. That is, the body side command packet signal 402 is transmitted to the first lens side communication unit 217 via the signal line BDAT.

  When the clock signal 401 is output to the signal line CLK, the lens control unit 203 and the lens-side first communication unit 217 synchronize with the clock signal 401, and the lens-side command packet that is the first half of the response data from the contact LP5. The signal 403 is output. That is, the lens-side command packet signal 403 is transmitted to the first body-side communication unit 117 via the signal line LDAT.

  The lens control unit 203 and the lens side first communication unit 217 set the signal level of the signal line RDY to the H level in response to the completion of transmission of the lens side command packet signal 403 (T2). The lens control unit 203 starts a first control process 404 (described later) that is a process according to the content of the received body-side command packet signal 402.

  When the first control process 404 is completed, the lens control unit 203 notifies the lens side first communication unit 217 of the completion of the first control process 404. In response to this notification, the lens side first communication unit 217 outputs an L level signal from the contact LP6. That is, the signal level of the signal line RDY is set to L level (T3). The body control unit 103 and the first body side communication unit 117 output the clock signal 405 from the contact point BP3 in accordance with the change in the signal level. That is, the clock signal 405 is transmitted to the lens side first communication unit 217 via the signal line CLK.

  The body control unit 103 and the first body-side communication unit 117 output a body-side data packet signal 406 that is the latter half of the control data from the contact point BP4 in synchronization with the clock signal 405. That is, the body side data packet signal 406 is transmitted to the lens side first communication unit 217 via the signal line BDAT.

  Further, when the clock signal 405 is output to the signal line CLK, the lens control unit 203 and the lens side first communication unit 217 synchronize with the clock signal 405, and the lens which is the latter half of the response data from the contact LP5 receives the data packet signal. 407 is output. That is, the lens-side data packet signal 407 is transmitted to the first body-side communication unit 117 via the signal line LDAT.

  In response to the completion of transmission of the lens-side data packet signal 407, the lens control unit 203 and the lens-side first communication unit 217 set the signal level of the signal line RDY to the H level again (T4). The lens control unit 203 starts a second control process 408 (described later) that is a process according to the content of the received body-side data packet signal 406.

  As described above, the lens-side first communication unit 217 includes the signal line CLK from which the clock signal is output from the camera body 100, the signal line BDAT from which the data signal is output from the camera body 100 in synchronization with the clock signal, A signal line LDAT from which a data signal is output in synchronization with the clock signal from the lens-side first communication unit 217, and a communication enable / disable signal indicating whether data communication from the lens-side first communication unit 217 to the lens-side first communication unit 217 is possible. Is communicated with the camera body 100 using the signal line RDY from which is output.

  Here, the first control process 404 and the second control process 408 performed by the lens control unit 203 will be described.

  For example, a case where the received body-side command packet signal 402 has a content requesting specific data on the interchangeable lens side will be described. As the first control process 404, the lens control unit 203 analyzes the content of the command packet signal 402 and executes a process of generating the requested specific data. Further, as the first control process 404, the lens control unit 203 uses the checksum data included in the command packet signal 402 to easily determine whether there is an error in the communication of the command packet signal 402 from the number of data bytes. The communication error check process to check is also executed. The specific data signal generated in the first control process 404 is output to the body side as a lens-side data packet signal 407. In this case, the body side data packet signal 406 output from the body side after the command packet signal 402 is a dummy data signal (including checksum data) that has no particular meaning for the lens side. In this case, the lens control unit 203 executes the communication error check process as described above using the checksum data included in the body side data packet signal 406 as the second control process 408.

  For example, a case where the received body-side command packet signal 402 is an instruction to drive a lens-side driven member will be described. For example, a case where the command packet signal 402 is an instruction to drive the focusing lens 210b and the received body side data packet signal 406 is the driving amount of the focusing lens 210b will be described. As the first control process 404, the lens control unit 203 analyzes the content of the command packet signal 402 and generates an acknowledgment signal indicating that the content has been understood. Furthermore, the lens control unit 203 also executes the communication error check process as described above using the checksum data included in the command packet signal 402 as the first control process 404. The acknowledge signal generated in the first control process 404 is output to the body side as a lens side data packet signal 407. In addition, as the second control process 408, the lens control unit 203 executes an analysis process of the contents of the body side data packet signal 406 and uses the checksum data included in the body side data packet signal 406 as described above. Execute the check process.

  When the second control process 408 is completed, the lens control unit 203 notifies the lens side first communication unit 217 of the completion of the second control process 408. Accordingly, the lens control unit 203 causes the lens side first communication unit 217 to output an L level signal from the contact LP6. That is, the signal level of the signal line RDY is set to L level (T5).

  If the received body-side command packet signal 402 is an instruction to drive a lens-side driven member (for example, a focusing lens) as described above, the lens control unit 203 sends a signal to the lens-side first communication unit 217. While the signal level of the line RDY is set to L level, the focusing lens driving unit 212 is caused to execute processing for driving the focusing lens 210b by the driving amount.

  The communication performed at the above-described time T1 to time T5 is one command data communication. As described above, in one command data communication, body control unit 103 and body side first communication unit 117 transmit body side command packet signal 402 and body side data packet signal 406 one by one. In other words, the body side command packet signal 402 and the body side data packet signal 406 together constitute one control data although it is divided and transmitted for convenience of processing.

  Similarly, in one command data communication, the lens control unit 203 and the lens side first communication unit 217 transmit the lens side command packet signal 403 and the lens side data packet signal 407 one by one. That is, the lens side command packet signal 403 and the lens side data packet signal 407 are combined to form one response data.

  As described above, the lens control unit 203 and the lens-side first communication unit 217 perform reception of control data from the body-side first communication unit 117 and transmission of response data to the body-side first communication unit 117 in parallel. And do it. The contact LP6 and the contact BP6 used for command data communication are contacts through which asynchronous signals (signal level of the signal line RDY / H (High) level or L (Low) level) that are not synchronized with other clock signals are transmitted. is there.

(Description of hotline communication)
The lens control unit 203 controls the lens side second communication unit 218 to transmit lens position data to the body side second communication unit 118 via the contacts LP7 to LP10, that is, the signal lines HREQ, HANS, HCLK, and HDAT. Send. Hereinafter, details of communication performed between the lens-side second communication unit 218 and the body-side second communication unit 118 will be described.

  In the present embodiment, communication performed between the lens control unit 203 and the lens-side second communication unit 218, and the body control unit 103 and the body-side second communication unit 118 is referred to as “hotline communication”. A transmission line composed of four signal lines (signal lines HREQ, HANS, HCLK, and HDAT) used for hot line communication is referred to as a second transmission line.

  FIG. 5 is a timing chart showing an example of hotline communication. The body control unit 103 of the present embodiment is configured to start hot line communication every second predetermined period (for example, 1 millisecond in the present embodiment). This period is shorter than the period for performing command data communication. FIG. 5A is a diagram illustrating a state in which hot line communication is repeatedly performed at predetermined intervals Tn. FIG. 5B shows a state in which a certain communication period Tx is expanded in hot line communication repeatedly executed. Hereinafter, the procedure of hotline communication will be described based on the timing chart of FIG.

  At the start of hot line communication (T6), body control unit 103 and body-side second communication unit 118 first output an L level signal from contact point BP7. That is, the signal level of the signal line HREQ is set to L level. The lens side second communication unit 218 notifies the lens control unit 203 that this signal has been input to the contact LP7. In response to this notification, the lens control unit 203 starts executing a generation process 501 that generates lens position data. The generation process 501 is a process in which the lens control unit 203 causes a focusing lens position detection unit (not shown) to detect the position of the focusing lens 210b and generates lens position data representing the detection result.

  When the lens control unit 203 completes the generation process 501, the lens control unit 203 and the lens-side second communication unit 218 output an L level signal from the contact LP8 (T7). That is, the signal level of the signal line HANS is set to the L level. The body control unit 103 and the body-side second communication unit 118 output the clock signal 502 from the contact BP9 in response to the input of this signal to the contact BP8. That is, a clock signal is transmitted to the lens side second communication unit 218 via the signal line HCLK.

  The lens control unit 203 and the second lens-side communication unit 218 output a lens position data signal 503 representing lens position data from the contact LP10 in synchronization with the clock signal 502. That is, the lens position data signal 503 is transmitted to the body-side second communication unit 118 via the signal line HDAT.

  When the transmission of the lens position data signal 503 is completed, the lens control unit 203 and the second lens side communication unit 218 output an H level signal from the contact LP8. That is, the signal level of the signal line HANS is set to the H level (T8). The body-side second communication unit 118 outputs an H-level signal from the contact LP7 in response to the input of this signal to the contact BP8. That is, the signal level of the signal line HREQ is set to H level (T9).

  The communication performed from time T6 to time T9 described above is one hot line communication. As described above, in one hot line communication, one lens position data signal 503 is transmitted by the lens control unit 203 and the second lens side communication unit 218. The contacts LP7, LP8, BP7, and BP8 used for hotline communication are contacts through which asynchronous signals that are not synchronized with other clock signals are transmitted. That is, the contacts LP7 and BP7 are contacts through which an asynchronous signal (signal level HREQ signal level / H (High) level or L (Low) level) is transmitted, and the contacts LP8 and BP8 are asynchronous signals (signal line HANS). Signal level / H (High) level or L (Low) level).

  Note that the command data communication and the hotline communication can be executed simultaneously or partially in parallel. That is, one of the lens side first communication unit 217 and the lens side second communication unit 218 can communicate with the camera body 100 even when the other is communicating with the camera body 100. is there.

(Description of the power supply state of the camera body 100)
The camera body 100 has two states, a power-off state and a power-on state. When the camera body 100 is in a power-off state, the user cannot use functions of the camera body 100 such as shooting and playback. When the camera body 100 is in the power-on state, the user can take and play still images and moving images.

  The power transmission unit 130 of the camera body 100 supplies a predetermined first output current to the interchangeable lens 200 (power reception unit 230) when the camera body 100 is in a power-off state. The first output current is a current of about 50 mA, for example. That is, in the camera 1 of the present embodiment, a constant current is supplied to the interchangeable lens 200 even when the camera body 100 is in the power-off state. On the other hand, when the power is on, the power transmitting unit 130 of the camera body 100 supplies the interchangeable lens 200 (power receiving unit 230) with a second output current that is larger than when the power is off. The second output current is a current of about 100 mA, for example.

  When the user presses the button 107 when the camera body 100 is in the power-off state, the body control unit 103 detects the pressing operation applied to the button 107 and turns the camera body 100 into the power-on state. On the other hand, when the camera body 100 is in the power-on state, when the user presses the button 107, the body control unit 103 places the camera body 100 in the power-off state. That is, the body control unit 103 switches between the power-off state and the power-on state of the camera body 100.

  Further, the camera body 100 can be switched between the power-off state and the power-on state by using a button 207 provided on the interchangeable lens 200. Details of processing executed by the body control unit 103 and the lens control unit 203 when the button 207 is pressed will be described later.

(Description of power transmission unit 130 and power reception unit 230)
FIG. 6 is a block diagram illustrating details of the power transmission unit 130 and the power reception unit 230. The power transmission unit 130 includes a series regulator 131 that can supply a first output current (50 mA), a DC / DC converter 132 that can supply a second output current (100 mA), and a connection between these two power supply circuits and the contact point BP1. And a switch SW3 that can be switched. A battery 133 is connected to each of the series regulator 131 and the DC / DC converter 132. The battery 133 is a known secondary battery such as a lithium ion battery, and is a power supply source to the camera body 100 and the interchangeable lens 200.

  The body control unit 103 outputs a first output current (50 mA) from the series regulator 131 when the camera body 100 is in a power-off state, and a second output current (100 mA) from the DC / DC converter 132 when the camera body 100 is in a power-on state. Are switched to the interchangeable lens 200, the switch SW3 of the power transmission unit 130 is switched. That is, when the camera body 100 is in the power-on state, the switch SW3 connects the contact point BP1 and the series regulator 131, and when the camera body 100 is in the power-off state, the switch SW3 connects the contact point BP1 and the DC / DC converter 132.

  The power receiving unit 230 receives a first output current (50 mA) from the camera body 100 (power transmission unit 130) when the camera body 100 is in a power-off state and a second output current (100 mA) when the camera body 100 is in a power-on state. Receive. The power receiving unit 230 supplies these received output currents to the lens control unit 203 and various peripheral circuits 231 and 232. The peripheral circuits 231 and 232 shown in FIG. 6 are, for example, a motor drive circuit and an image blur detection circuit, respectively. In FIG. 6, two peripheral circuits 231 and 232 are illustrated as an example, but any number of such peripheral circuits may be used.

  The power receiving unit 230 includes a plurality of switches SW1 and SW2 that can switch the current supply to the peripheral circuits 231 and 232. The lens control unit 203 is configured to be able to individually control ON / OFF of these switches SW1 and SW2.

(Description of the operating state of the interchangeable lens 200)
The interchangeable lens 200 operates at a predetermined first consumption current (for example, 0.1 mA) that is much smaller than the first output current (50 mA) when the camera body 100 is in a power-off state. The reason why the operation can be performed with such a small amount of current consumption is that the processing content of the interchangeable lens 200 when the camera body 100 is in the power-off state is very limited, as will be described later. Hereinafter, a state in which the interchangeable lens 200 operates at the first consumption current (0.1 mA) is referred to as a first operation state.

  The interchangeable lens 200 has a second operation state and a second operation state in addition to the first operation state described above. The second operation state is a state in which the interchangeable lens 200 operates with a second current consumption (for example, 50 mA). The second consumption current (50 mA) is a consumption current amount that is larger than the first consumption current (0.1 mA) but less than or equal to the first output current (50 mA). When the interchangeable lens 200 is in the first operation state and the second operation state, the user cannot perform shooting using the camera 1. Further, when the interchangeable lens 200 is in the first operation state and the second operation state, the lens side first communication unit 217 cannot perform command data communication with the camera body 100. This is because when the interchangeable lens 200 is in the first operation state or the second operation state, the lens control unit 203 switches the switches SW1 and SW2 of the power receiving unit 230 to supply current to peripheral circuits necessary for photographing and command data communication. This is because it is not performed.

  The third operating state of the interchangeable lens 200 is a state in which the interchangeable lens 200 operates at a third consumption current (for example, 100 mA) that is greater than the first output current (50 mA) and less than or equal to the second output current (100 mA). At this time, current is supplied to each peripheral circuit of the interchangeable lens 200, and the camera body 100 can use all the functions of the interchangeable lens 200. When the camera body 100 is in the power-on state, the interchangeable lens 200 is in the third operation state.

(Description of power-on by operating the camera body 100)
FIG. 7 is a timing chart showing how the camera body 100 is turned on when the button 107 is pressed. In this timing chart, the amount of current supplied from the power transmission unit 130 of the camera body 100 to the interchangeable lens 200, the amount of current consumed by the interchangeable lens 200, the signal level of the signal line RDY, the signal level of the signal line CLK, It is shown.

  The camera body 100 is in a power-off state from the beginning of the timing chart shown in FIG. 7 to time T11. At this time, the first output current (50 mA) is supplied from the power transmission unit 130 to the power reception unit 230. In addition, the interchangeable lens 200 operates at the first consumption current (0.1 mA). That is, the interchangeable lens 200 is in the first operation state.

  When the camera body 100 is in a power-off state, the signal level of the signal line RDY is L (Low) level, and the signal line CLK is L (Low) level. At this time, the body control unit 103 performs only detection of the pressing operation of the button 107 and detection of a change in the signal level of the signal line RDY. Therefore, the power consumption of the body control unit 103 is very small compared to that in the power-on state. In addition, the lens control unit 203 performs only detection of the pressing operation of the button 207 and detection of a change in the signal level of the signal line CLK. Therefore, the interchangeable lens 200 consumes only the first consumption current (0.1 mA), which is a very small consumption current.

  A time T11 in FIG. 7 is a time when the user presses the button 107 of the camera body 100. When the body control unit 103 detects a pressing operation of the button 107, the body control unit 103 enters a power-on state and starts supplying the second output current (100 mA) to the interchangeable lens 200. That is, the switch SW3 shown in FIG. 6 is switched to the DC / DC converter 132 side, and the contact BP1 and the DC / DC converter 132 are connected.

  Next, the body control unit 103 controls the body-side first communication unit 117 to change the signal level of the signal line CLK from the L level to the H level (time T12). This signal output to the signal line CLK is a signal indicating that the camera body 100 has changed from the power-off state to the power-on state. That is, in the activation sequence of the camera 1 by the button 107, the signal line CLK is used for input / output of a signal indicating that the camera body 100 is in a power-on state.

  When the lens control unit 203 detects this signal output to the signal line CLK in the first operation state, the lens control unit 203 places the interchangeable lens 200 in the third operation state and starts an operation based on the third current consumption (100 mA) (time). T13). The lens control unit 203 energizes various peripheral circuits and starts the activation process of the interchangeable lens 200. In the activation process, the lens control unit 203 initializes the lens-side first communication unit 217 so that the above-described command data communication can be performed. This signal output to the signal line RDY is a signal indicating that the lens control unit 203 is initializing the lens side first communication unit 217. That is, in the activation sequence of the camera 1 by the button 107, the signal line RDY is used for input / output of a signal indicating that the lens control unit 203 is initializing the lens side first communication unit 217. When the initialization process is completed, the lens control unit 203 changes the signal level of the signal line RDY from the L level to the H level. By detecting this signal, the body control unit 103 recognizes that command data communication with the interchangeable lens 200 is possible.

  Thereafter, the body control unit 103 performs data communication with the interchangeable lens 200 by command data communication, and performs various initialization processes necessary for normal operations such as shooting. As a result, shooting and playback using the camera 1 can be performed.

(Description of power-on by operating the interchangeable lens 200)
FIG. 8 is a timing chart showing how the camera body 100 is turned on when the button 207 is pressed. In this timing chart, as in FIG. 7, the amount of current supplied from the power transmission unit 130 of the camera body 100 to the interchangeable lens 200, the amount of current consumed by the interchangeable lens 200, the signal level of the signal line RDY, and the signal line CLK The signal level is shown.

  From the beginning of the timing chart to time T21, the camera body 100 is in a power-off state. As described with reference to FIG. 7, the interchangeable lens 200 operates in the first operation state when the camera body 100 is in the power-off state.

  A time T21 in FIG. 8 is a time when the user presses the button 207 of the interchangeable lens 200. When the lens control unit 203 detects the pressing operation of the button 207, the lens control unit 203 enters the second operation state accordingly, and starts the operation with the second consumption current (50 mA). In the second operation state, each peripheral circuit of the interchangeable lens 200 is not energized, and the lens control unit 203 can execute only limited processing. This is because the process of consuming a large amount of current cannot be executed because the output current supplied from the power transmission unit 130 is limited.

  The lens control unit 203 controls the lens side first communication unit 217 in response to the interchangeable lens 200 being in the second operation state, and changes the signal level of the signal line RDY from the L level to the H level (time T22). ). This signal output to the signal line RDY is a signal representing a state change instruction to turn on the power. That is, the lens-side first communication unit 217 sends a signal indicating a state change instruction to the power-on state to the camera body 100 (the body-side first communication unit 117) in response to the interchangeable lens 200 being in the second operation state. Output to.

  The body control unit 103 switches the camera body 100 to the power-on state in response to the input of this signal output to the signal line RDY (time T23). Since the power supply is turned on, the body control unit 103 switches the switch SW3 shown in FIG. 6 and connects the contact point BP1 to the DC / DC converter 132. As a result, the second output current (100 mA) is supplied to the interchangeable lens 200.

  When switching of the switch SW3 is completed, the body control unit 103 controls the first body-side communication unit 117 to change the signal level of the signal line CLK from the L level to the H level (time T24). This signal output to the signal line CLK is a signal indicating that the camera body 100 has been turned on by the signal output to the signal line RDY. That is, the body-side first communication unit 117 turns the camera body 100 into the power-on state in the interchangeable lens 200 (lens-side first communication unit 217) in response to the power transmission unit 130 being able to supply the second output current. Outputs a signal indicating that When the lens control unit 203 is in the second operation state, the lens control unit 203 detects this signal output to the signal line CLK, sets the interchangeable lens 200 to the third operation state, and starts the operation with the third current consumption (100 mA) (time T25). ). That is, when the interchangeable lens 200 is in the second operation state, the interchangeable lens 200 enters the third operation state in response to the input of this signal to the lens-side first communication unit 217.

According to the camera system according to the first embodiment described above, the following operational effects can be obtained.
(1) The power receiving unit 230 receives a first output current from the camera body 100 when the camera body 100 is in a power-off state and a second output current larger than the first output current when the camera body 100 is in a power-on state. To do. In addition, the interchangeable lens 200 has a first operation state that operates with a first consumption current smaller than the first output current, and a second operation that operates with a second consumption current that is greater than the first consumption current but less than or equal to the first output current. And a third operating state that operates with a third current consumption that is greater than the first output current but less than or equal to the second output current. When the camera body 100 is in the power off state, the interchangeable lens 200 operates in the first operation state, and when the operation of the button 207 is detected by the lens control unit 203, the interchangeable lens 200 enters the second operation state. In response to this, the lens-side first communication unit 217 outputs a signal representing a state change instruction to the power-on state to the camera body 100. Thereafter, the interchangeable lens 200 enters the third operation state in response to a signal indicating that the camera body 100 is in a power-on state by the above signal being input to the lens-side first communication unit 217. Since it did in this way, it becomes possible to change the power supply state by the operation member by the side of an interchangeable lens, without using a mechanical connection switching mechanism and low power consumption.

(2) The lens side first communication unit 217 includes a signal line CLK from which the clock signal is output from the camera body 100, a signal line BDAT from which the data signal is output from the camera body 100 in synchronization with the clock signal, and the lens side. A signal line LDAT from which a data signal is output in synchronization with the clock signal from the first communication unit 217 and a communication enable / disable signal indicating whether data communication from the lens side first communication unit 217 to the lens side first communication unit 217 is output. Data communication with the camera body 100 using the signal line RDY. The first lens-side communication unit 217 outputs a signal indicating a state change instruction to the power-on state through the signal line RDY, and receives a signal input indicating that the camera body 100 is in the power-on state based on the signal. This is done by the line CLK. Since it did in this way, it becomes unnecessary to prepare the dedicated signal line used only at the time of power-on, and the number of contacts of the holding parts 102 and 202 is reduced.

(3) The lens-side first communication unit 217 cannot perform data communication with the camera body 100 when the interchangeable lens 200 is in the first operation state and the second operation state. Thus, the amount of current consumed by the interchangeable lens 200 when the interchangeable lens 200 is in the first operation state and the second operation state is reduced.

(4) When the interchangeable lens 200 is in the first operation state, the interchangeable lens 200 enters the third operation state in response to a signal indicating that the camera body 100 is in a power-on state being input to the lens-side first communication unit 217. Become. Since it did in this way, when starting camera 1 with the operation member by the side of camera body 100, it is not necessary to go through the 1st operation state, and camera 1 can be started at high speed.

(5) The interchangeable lens 200 cannot perform photographing in the first operation state and the second operation state. Since it did in this way, the power consumption of the interchangeable lens 200 in a 1st operation state and a 2nd operation state can be made small compared with the 3rd operation state which can image | photograph.

(6) The interchangeable lens 200 operates in the first operation state when the camera body 100 is in the power-off state, and enters the second operation state in response to the operation of the button 207 being detected by the lens control unit 203. Become. The lens side first communication unit 217 outputs a predetermined first signal to the body side first communication unit 117 in response to the interchangeable lens 200 being in the second operation state, and the body control unit 103 The camera body 100 is switched to a power-on state in response to a signal input. Thereafter, the body-side first communication unit 117 outputs a predetermined second signal to the lens-side first communication unit 217 in response to the fact that the power transmission unit 130 can supply the second output current, and the interchangeable lens 200 is In the second operation state, the third operation state is entered in response to the input of the second signal. Thus, the camera body 100 can be turned on by pressing the button 207 on the interchangeable lens 200 side.

(7) The power transmission unit 130 includes a series regulator 131 that can supply a first output current and a DC / DC converter 132 that can supply a second output current. When the camera body 100 is in the power-off state, power is supplied to the interchangeable lens 200 by the series regulator 131. When the camera body 100 is in the power-on state, power is supplied to the interchangeable lens 200 by the DC / DC converter 132. . Since it did in this way, the electric energy consumed at the time of a power supply OFF state can be reduced.

  The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.

(Modification 1)
The lens control unit 203 of the above-described embodiment outputs a signal indicating a state change instruction to the power-on state to the signal line RDY. In addition, the body control unit 103 outputs a signal indicating that the camera body 100 is in a power-on state to the signal line CLK. These signals may be input / output via different signal lines. For example, the former signal may be input / output via the signal line LDAT and the latter signal via the signal line BDAT.

(Modification 2)
The current values of the first output current and the second output current described above are examples, and the present invention is not limited to this. That is, a current value other than 50 mA may be used as the first output current, and a current value other than 100 mA may be used as the second output current. Further, these current values are merely representative values, and some variations and fluctuations may occur during actual operation. That is, when it is said that the first output current is 50 mA, it does not mean that the first output current must be strictly 50 mA. The same applies to the first consumption current, the second consumption current, and the third consumption current.

(Modification 3)
In the above-described embodiment, the operation when the button 207 on the interchangeable lens 200 side is pressed has been described. The operation member for turning on the camera body 100 is not limited to such a button. For example, operation members such as a focus ring for adjusting the focus state of the imaging optical system 210 and a stop ring for adjusting the aperture diameter of the aperture 211 are provided in the interchangeable lens 200, and these operations are performed when the camera body 100 is in a power-off state. When the member is operated, the camera body 100 may be turned on. In other words, the operation member on the side of the interchangeable lens 200 that turns the camera body 100 on may not be an operation member provided only for changing the power supply state of the camera body 100.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 ... Camera, 100 ... Camera body, 101 ... Lens mount, 102 ... Holding part, 103 ... Body control part, 117 ... Body side 1st communication part, 118 ... Body side 2nd communication part, 130 ... Power transmission part, 131 ... Series regulator 132 ... DC / DC converter 133 ... battery 200 ... interchangeable lens 201 ... lens mount 202 ... holding unit 203 ... lens control unit 210 ... imaging optical system 217 ... first lens side communication unit 218 ... second communication unit on the lens side, 230 ... power receiving unit

Claims (7)

Mounting means for detachably mounting the camera body;
Power receiving means capable of receiving a first output current from the camera body when the camera body is in a power-off state, and a second output current larger than the first output current when the camera body is in a power-on state;
An operation member;
Detecting means for detecting operation of the operating member;
Lens side communication means capable of sending and receiving signals to and from the camera body;
An interchangeable lens comprising:
The interchangeable lens operates in a first operating state that operates at a first consumption current that is smaller than the first output current, and a second operation that operates at a second consumption current that is greater than the first consumption current but less than or equal to the first output current. An operating state, and a third operating state that operates with a third current consumption that is greater than the first output current but less than or equal to the second output current;
The interchangeable lens operates in the first operation state when the camera body is in the power-off state, and enters the second operation state in response to the operation of the operation member being detected by the detection means. ,
The lens side communication means outputs a first signal indicating a state change instruction to the power-on state to the camera body in response to the interchangeable lens being in the second operation state,
When the interchangeable lens is in the second operation state, the second signal indicating that the camera body is turned on by the first signal is input to the lens-side communication unit. An interchangeable lens that is in a third operating state. The interchangeable lens according to claim 1,
The lens side communication means includes a first signal line for outputting a clock signal from the camera body, a second signal line for outputting a data signal in synchronization with the clock signal from the camera body, and the lens side communication. A third signal line for outputting a data signal in synchronism with the clock signal from the means, and a fourth signal line for outputting a communication enable / disable signal indicating whether data communication of the lens side communication means is possible from the lens side communication means. And is configured to enable data communication with the camera body using
The lens-side communication means is configured to output the first signal and the second signal, respectively, one of the first signal line, the second signal line, the third signal line, and the fourth signal line. The interchangeable lens characterized by performing by. The interchangeable lens according to claim 2,
The interchangeable lens, wherein the lens side communication means cannot perform data communication with the camera body when the interchangeable lens is in the first operation state and the second operation state. In the interchangeable lens as described in any one of Claims 1-3,
When the interchangeable lens is in the first operation state, the interchangeable lens is in the third operation state in response to the second signal being input to the lens-side communication unit. In the interchangeable lens as described in any one of Claims 1-4,
The interchangeable lens is characterized in that photographing cannot be performed in the first operation state and the second operation state. A camera system comprising a camera body and an interchangeable lens detachable from the camera body,
The camera body is
A power source that is a source of power to the camera body and the interchangeable lens;
State switching means for switching between a power-off state and a power-on state of the camera body;
Power supply means capable of supplying a first output current to the interchangeable lens when the camera body is in the power-off state and a second output current larger than the first output current when the camera body is in the power-on state, respectively. When,
Body-side communication means capable of transmitting and receiving signals to and from the interchangeable lens;
With
The interchangeable lens is
An operation member;
Detecting means for detecting operation of the operating member;
Lens side communication means capable of sending and receiving signals to and from the camera body;
With
The interchangeable lens operates in a first operating state that operates at a first consumption current that is smaller than the first output current, and a second operation that operates at a second consumption current that is greater than the first consumption current but less than or equal to the first output current. An operating state and a third operating state that operates with a third current consumption that is greater than the first output current but less than or equal to the second output current;
The interchangeable lens operates in the first operation state when the camera body is in the power-off state, and enters the second operation state in response to the operation of the operation member being detected by the detection means. ,
The lens side communication means outputs a first signal to the body side communication means in response to the interchangeable lens being in the second operation state,
The state switching means switches the camera body to the power-on state in response to the input of the first signal,
The body side communication means outputs a second signal to the lens side communication means in response to the power supply means being able to supply the second output current,
The interchangeable lens is in the third operating state in response to the input of the second signal when in the second operating state. The camera system according to claim 6,
The power supply means includes a first power supply circuit capable of supplying the first output current and a second power supply circuit capable of supplying the second output current, and when the camera body is in the power-off state. The camera system according to claim 1, wherein when the camera body is in the power-on state, the first power supply circuit supplies power to the interchangeable lens by the second power supply circuit.

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