JP2018124585A - interchangeable lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accessory, a camera body and a camera system capable of detecting attachment / detachment of a lens with a simple communication procedure. A first truth value for a camera body during a period of suppressing an input operation of a first data signal via a third accessory contact and an output operation of a second data signal via a fourth accessory contact. The fifth accessory contact, which outputs a signal of the corresponding level, and the input operation of the first data signal from the camera body via the third accessory contact in synchronization with the clock signal input to the second accessory contact. The output operation of the second data signal to the camera body via the fourth accessory contact is performed, and when the operating voltage is supplied from the camera body via the first accessory contact, the first is performed to the fifth accessory contact. An accessory provided with an accessory-side communication control means that controls the duration of output of a signal at a level corresponding to the truth value of to less than a predetermined time. [Selection diagram] Fig. 1

Description

  The present invention relates to an interchangeable lens.

  2. Description of the Related Art Conventionally, a camera system in which a communication contact is provided between a camera body and an interchangeable lens is known. In such a camera system, there is one that detects attachment / detachment of an interchangeable lens using a communication contact. For example, Patent Document 1 describes a camera system that detects attachment of a photographic lens barrel using a communication line BINTL between the photographic lens barrel and the camera body. The communication line BINTL is a communication line used by the camera body for both input and output. The BCPU in the camera body needs to switch the terminal of the communication line to input when detecting attachment / detachment, and to switch the terminal to output when communicating.

JP-A-8-95144

  The attachment / detachment detection mechanism described in Patent Document 1 has a problem that the configuration is complicated.

  An interchangeable lens according to an aspect of the present invention is an interchangeable lens that can be attached to and detached from a camera body, and the interchangeable lens can perform data communication with the camera body when attached to the camera body. A contact that outputs a first voltage indicating that the interchangeable lens cannot perform data communication, and a second voltage that is higher than the first voltage, and is electrically connected to the contact. And a connected pull-down resistor.

  According to the present invention, lens attachment / detachment detection can be performed with a simple configuration.

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. 6 is a timing chart showing how the lens attachment / detachment detection unit 119 detects attachment / detachment of the interchangeable lens 200. 1 is a perspective view showing an interchangeable lens type camera system including an intermediate adapter to which the present invention is applied. 1 is a perspective view showing an interchangeable lens type camera system including an intermediate adapter to which the present invention is applied.

(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 system 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 body side mount 101 to which the interchangeable lens 200 is detachably attached. Holding the contact at a position in the vicinity of the body-side mount portion 101 of the camera body 100 (inner peripheral side of the body-side mount portion 101) while partially protruding toward the inner peripheral side of the body-side mount portion 101. A portion (electrical connection portion) 102 is provided. The holding portion 102 is provided with a plurality of contacts.

  In addition, the interchangeable lens 200 is provided with a lens side mount portion 201 corresponding to the body side mount portion 101 to which the camera body 100 is detachably attached. A holder that holds a contact at a position in the vicinity of the lens side mount portion 201 of the interchangeable lens 200 (inner peripheral side of the lens side mount portion 201) in a state of partially protruding toward the inner peripheral side of the lens side mount portion 201. Part (electrical connection 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 a CCD is provided behind the body side mount 101 in the camera body 100. Above the camera body 100, a button 107 serving as an input device is provided. The user uses the input device such as the button 107 to instruct the camera body 100 to shoot, set shooting conditions, and the like.

  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 210a to 210c. The plurality of lenses 210a to 210c includes a focusing lens 210b for controlling the focus position of the subject image.

  Inside the interchangeable lens 200, a lens-side control unit 203 that controls each part of the interchangeable lens 200 is provided. The lens side control unit 203 includes a microcomputer (not shown) and its peripheral circuits. The lens-side control unit 203 is connected to the lens-side first communication unit 217, the lens-side second communication unit 218, the lens driving unit 212, the lens position detection unit 213, the ROM 215, and the RAM 216.

  The lens-side first communication unit 217 and the lens-side second communication unit 218 exchange signals with the camera body 100 via the respective communication contacts provided in the holding unit 202, thereby communicating with the camera body 100. Perform data communication. The 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 lens driving unit 212. The lens position detection unit 213 detects the position of the focusing lens 210b by counting the number of pulses of a signal input to a stepping motor included in the lens driving unit 212, for example. Alternatively, the position of the focusing lens 210b may be detected using a known distance encoder or the like provided in the interchangeable lens 200.

  The ROM 215 is a non-volatile storage medium, and stores a predetermined control program executed by the lens side 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-side 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-side control unit 103 that controls each part of the camera body 100 is provided. The body side control unit 103 includes a microcomputer (not shown), a RAM, and peripheral circuits thereof. The body side first control unit 117, the body side second communication unit 118, and the lens attachment / detachment detection unit 119 are connected to the body side control unit 103.

  The body-side first communication unit 117 exchanges signals with the lens-side first communication unit 217 in the interchangeable lens 200 via each communication contact provided in the holding unit 102, so that the lens-side first communication is performed. Data communication with the unit 217 is performed. Similarly, the body side second communication unit 118 transmits and receives signals to and from the lens side second communication unit 218 in the interchangeable lens 200 via each communication contact provided in the holding unit 102, so that the lens side Data communication with the second communication unit 218 is performed. The lens attachment / detachment detection unit 119 detects attachment / detachment of the interchangeable lens 200 based on a signal level of a specific contact described below among a plurality of contacts provided in the holding unit 102.

  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-side control unit 103 displays various menu screens for setting a subject image (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. As shown in FIG. 3, the holding | maintenance part 102 has 12 contacts of BP1-BP12. The holding unit 202 has 12 contacts LP1 to LP12 corresponding to the 12 contacts. Hereinafter, BP1 to BP12 are referred to as body side contacts, and LP1 to LP12 are referred to as lens side contacts.

  The body side contacts BP1 and BP2 are connected to the first power supply circuit 120 in the camera body 100. The first power supply circuit 120 supplies the operating voltage of each part in the interchangeable lens 200 excluding the lens driving part 212 to the body side contact BP1. That is, when the interchangeable lens 200 is attached to the camera body 100 via the body side mount unit 101 and the lens side mount unit 201, the lens driving unit 212 is connected from the body side contact BP1 and the lens side contact LP1. The operating voltage of each part (including the lens-side first communication unit 217 and the lens-side second communication unit 218) in the interchangeable lens 200 is supplied. The body side contact BP2 is a ground terminal corresponding to the above operating voltage. That is, the body side contact BP2 and the lens side contact LP2 are ground terminals corresponding to the above operating voltage.

  In the following description, a signal line constituted by the body side contact BP1 and the lens side contact LP1 is referred to as a signal line V33. A signal line constituted by the body side contact BP2 and the lens side contact LP2 is referred to as a signal line GND.

Body side contacts BP3, BP4, BP5, and BP6 are contacts for performing data communication called command data communication. These four body-side contacts are connected to the body-side first communication unit 117. The lens side contacts LP3, LP4, LP5 and LP6 connected to these four contacts 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 perform data communication by exchanging signals through the four body-side contacts and the four lens-side contacts. The contents of data communication (command data communication) performed by the body-side first communication unit 117 and the lens-side first communication unit 217 will be described in detail later.

  When the signal level of the signal input from each contact is equal to or higher than a predetermined reference level (for example, 2.0 V), the body-side first communication unit 117 and the lens-side first communication unit 217 receive the truth of the input signal. It is determined that the value represents “true” (also referred to as 1, H, High, etc.). Further, when the signal level of the signal input from each contact is equal to or lower than a predetermined reference level (for example, 0.8 V) set separately from the reference level, the input signal has the truth value “false”. (Also referred to as 0, L, Low, etc.). The same applies to the body-side second communication unit 118 and the lens-side second communication unit 218.

  The body side contact BP6 is connected to the power source Vcc (for example, 5 V) via the pull-up resistor R1 in the camera body 100. That is, the body side contact point BP6 is pulled up. On the other hand, the lens side contact LP6 is grounded through the pull-down resistor R2 in the interchangeable lens 200. That is, the lens side contact LP6 is pulled down.

  The resistance values of the pull-up resistor R1 and the pull-down resistor R2 are such that when the camera body 100 is attached to the interchangeable lens 200 and data communication is not performed by the lens-side first communication unit 217, the signal level of the body-side contact BP6 is It is determined to be a signal level corresponding to the truth value L (for example, a signal level of 0.8 V or less). For example, R1 = 10 kΩ and R2 = 100Ω.

  When the interchangeable lens 200 is not attached to the body side mount 101, the signal level of the body side contact point BP6 becomes a signal level corresponding to the truth value H (for example, 2.0 V or more). This is because the body side contact point BP6 is pulled up.

  A lens attachment / detachment detector 119 is connected to the body side contact BP6. The lens attachment / detachment detection unit 119 detects attachment / detachment of the interchangeable lens 200 based on the signal level of the body side contact BP6. Detection of attachment / detachment by the lens attachment / detachment detection unit 119 will be described in detail later.

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

  The body side contacts BP7, BP8, BP9, and BP10 are contacts for performing data communication called hotline communication. These four body-side contacts are connected to the body-side second communication unit 118. The lens side contacts LP7, LP8, LP9, and LP10 connected to these four contacts are connected to the lens side second communication unit 218. The body-side second communication unit 118 and the lens-side second communication unit 218 perform data communication by exchanging signals through the four body-side contacts and the four lens-side contacts. The contents of data communication (hotline 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 body side contact BP7 and the lens side contact LP7 is referred to as a signal line HREQ. Similarly, the signal line formed by the body side contact BP8 and the lens side contact LP8 is the signal line HANS, the signal line formed by the body side contact BP9 and the lens side contact LP9 is the signal line HCLK, and the body side contact BP10 and A signal line constituted by the lens side contact LP10 is referred to as a signal line HDAT.

  The body side contacts BP11 and BP12 are connected to the second power supply circuit 121 in the camera body 100. The second power supply circuit 121 supplies the driving voltage of the lens driving unit 212 to the body side contact BP12. That is, the driving voltage of the lens driving unit 212 is supplied from the body side contact BP12 and the lens side contact LP12. The body side contact BP11 is a ground terminal corresponding to the drive voltage. That is, the voltage at the body side contact BP11 and the lens side contact LP11 is a ground voltage corresponding to the drive voltage.

  In the following description, the signal line constituted by the body side contact BP11 and the lens side contact LP11 is referred to as a signal line PGND. A signal line constituted by the body side contact BP12 and the lens side contact LP12 is referred to as a signal line BAT.

  Note that the difference between the maximum value and the minimum value of the current flowing through the body side contact BP11 and the lens side contact LP11 is larger than the difference between the maximum value and the minimum value of the current flowing through the body side contact BP2 and the lens side contact LP2. ing. This is because the power consumed by the lens driving unit 212 having a driving system such as an actuator is larger than that of an electronic circuit such as the lens-side control unit 203 in the interchangeable lens 200, and the focusing lens 210b needs to be driven. If not, the lens driving unit 212 does not consume power.

(Description of command data communication)
The lens side first communication unit 217 performs data communication with the body side first communication unit 117 via the lens side contacts LP3 to LP6, that is, the signal lines CLK, BDAT, LDAT, and RDY. This data communication is repeated every 16 milliseconds, for example. In this data communication, 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 are performed in parallel. 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-side first communication unit 217 and the body-side first communication unit 117 is referred to as command data communication.

  FIG. 4 is a timing chart showing an example of command data communication. When the body-side first communication unit 117 and the lens-side first communication unit 217 are not performing data communication (before time T1 in FIG. 4), the signal level of the signal line RDY is the signal level corresponding to the truth value L. It has become.

  The body-side first communication unit 117 first checks 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, the lens side first communication unit 217 transmits a signal indicating whether or not the lens side first communication unit 217 can perform data communication to the lens side contact LP6. This signal is neither a data signal nor a clock signal. If the lens-side first communication unit 217 is in a state where data communication cannot be performed, an H (High) level signal is output from the lens-side contact LP6. When the signal line RDY is at the H level, the body-side first communication unit 117 does not start communication until the signal line RDY is at the L level. Also, the next process during communication is not executed.

If the signal line RDY is at L (Low) level, the first body-side communication unit 117 outputs the clock signal 401 from the body-side contact BP3. The body-side first communication unit 117 outputs a body-side command packet signal 402 that is the first half of the control data from the body-side contact BP4 in synchronization with the clock signal 401. When the clock signal 401 is output to the signal line CLK, the first lens-side communication unit 217 outputs the lens-side command packet signal 403 that is the first half of the response data from the lens-side contact LP5 in synchronization with the clock signal 401. To do.

  The lens side first communication unit 217 sets 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 side control unit 203 starts a first control process 404 that is a process according to the content of the received body side command packet signal 402. For example, when the received body-side command packet signal 402 has a content requesting specific data, the lens-side control unit 203 executes a process for generating the data as the first control process 404.

  When the first control process 404 is completed, the lens side 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 lens side contact LP6 (T3). The body-side first communication unit 117 outputs a clock signal 405 from the body-side contact BP3 according to the change in the signal level. The body-side first communication unit 117 outputs a body-side data packet signal 406 that is the latter half of the control data from the body-side contact BP4 in synchronization with the clock signal 405. When the clock signal 405 is output to the signal line CLK, the lens-side first communication unit 217 outputs the lens-side data packet signal 407 that is the latter half of the response data from the lens-side contact LP5 in synchronization with the clock signal 405. To do.

  In response to the completion of transmission of the lens-side data packet signal 407, the lens-side first communication unit 217 sets the signal level of the signal line RDY to the H level again (T4). The lens side control unit 203 starts a second control process 408 that is a process according to the contents of the received body side command packet signal 402 and body side data packet signal 406. For example, if the received body-side 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, the lens-side control unit 203 performs the second control process. As 408, processing for driving the focusing lens 210b by the driving amount is executed.

  When the second control process 408 is completed, the lens side control unit 203 notifies the lens side first communication unit 217 of the completion of the second control process 408. In response to this notification, the first lens side communication unit 217 outputs an L level signal from the lens side contact LP6 (T5).

  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-side command packet signal 402 and body-side data packet signal 406 are transmitted one by one by body-side control unit 103 and body-side first communication unit 117, respectively. 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-side command packet signal 403 and the lens-side data packet signal 407 are transmitted one by one by the lens-side control unit 203 and the lens-side first communication unit 217, respectively. 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-side first communication unit 217 performs 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.

  As described above, the lens side first communication unit 217 and the body side first communication unit 117 output various signals to the four signal lines (CLK, BDAT, LDAT, RDY) used for command data communication. . As is apparent from FIG. 4, the signal having the smallest change in signal level among these signals is a signal output to the signal line RDY by the lens-side first communication unit 217. That is, in the command data communication with the camera body 100, the lens side first communication unit 217 causes the lens side contacts LP3 to LP3 to minimize the change in the signal level of the lens side contact LP6 among the four lens side contacts LP3 to LP6. Control LP6.

  As for the first control process 404 and the second control process 408 described above, a predetermined specified (limit / upper limit) time is required with respect to the time required for the control process so that the process of the entire camera is not delayed. Are provided in advance in the memory of the lens side control unit 203. In command data communication, control processing (work) performed on the lens side is usually completed in about several hundred microseconds to several milliseconds if the lens side is operating normally. For this reason, a time obtained by adding a certain margin time to the working time on the lens side in command data communication is set as the specified time. In the present embodiment, the specified time is tuned to an appropriate value within a range of several tens of milliseconds to several hundreds of milliseconds, for example. That is, the lens side control unit 203 performs control so that the periods T23 and T45 illustrated in FIG. 4 do not exceed the specified time. In other words, the lens-side first communication unit 217 is supplied with operating power from the camera body 100 to the lens control unit 203 while the camera body 100 is attached to the lens-side mount unit 201. In the meantime, the lens side contact LP6 is controlled so that the signal level of the lens side contact LP6 does not become the signal level corresponding to the truth value H continuously for the above specified time or more.

(Description of hotline communication)
The lens-side second communication unit 218 transmits lens position data to the body-side second communication unit 118 via the lens-side contacts LP7 to LP10, that is, the signal lines HREQ, HANS, HCLK, and HDAT. 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-side second communication unit 218 and the body-side second communication unit 118 is referred to as hotline communication.

  FIG. 5 is a timing chart showing an example of hotline communication. The body side control unit 103 of the present embodiment is configured to start hot line communication every second predetermined period Tn (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.

  When the hot line communication is started (T6), the body side second communication unit 118 first outputs an L level signal from the body side contact point BP7. The second lens side communication unit 218 notifies the lens side control unit 203 that this signal has been input to the lens side contact LP7. In response to this notification, the lens-side 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-side control unit 203 causes the lens position detection unit 213 to detect the position of the focusing lens 210b and generates lens position data representing a detection result.

  When the lens-side control unit 203 completes the generation process 501, the lens-side second communication unit 218 outputs an L-level signal from the lens-side contact LP8 (T7). The body-side second communication unit 118 outputs a clock signal 502 from the body-side contact BP9 in response to the input of this signal to the body-side contact BP8. The lens side second communication unit 218 outputs a lens position data signal 503 representing lens position data from the lens side contact LP10 in synchronization with the clock signal 502.

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

  The communication performed from time T6 to time T9 described above is one hot line communication. As described above, one lens position data signal 503 is transmitted by the lens side control unit 203 and the lens side second communication unit 218 in one hot line communication.

  Of the four lens side contacts LP7 to LP10 used for hotline communication, a signal that is neither a clock signal nor a data signal is output to the lens side contacts LP7 and LP8. The change in the signal level of these two lens side contacts is greater than that of the lens side contact LP6 used for command data communication. This is because hot line communication is executed in a shorter cycle than command data communication.

  For example, when command data communication is executed every 16 milliseconds and hot line communication is executed every 1 millisecond, the signal level change of the lens side contact LP6 is four times per 16 milliseconds. On the other hand, the hot line communication is executed, for example, every 1 millisecond, and the signal level change per communication at the lens side contacts LP7 and LP8 is twice, so that the signal level is 32 times per 16 milliseconds. Will change.

  In other words, in the command side data communication and hotline communication with the camera body 100, the first lens side communication unit 217 causes the lens side contact LP6 among the lens side contacts LP3 to LP10 to have the least change in the signal level. The contacts LP3 to LP6 are controlled.

  Note that command data communication and hotline communication can be executed 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.

(Explanation of attachment / detachment detection of interchangeable lens)
FIG. 6A is a timing chart showing how the lens attachment / detachment detection unit 119 detects the attachment of the interchangeable lens 200. When the interchangeable lens 200 is not attached to the camera body 100, the body side contact point BP6 is pulled up (FIG. 3), so that the signal level of the body side contact point BP6 becomes a signal level corresponding to the truth value H. Here, when the interchangeable lens 200 is attached, since the lens side contact LP6 is pulled down (FIG. 3), the signal level of the body side contact BP6 becomes a signal level corresponding to the truth value L (T10). As described above, the lens attachment / detachment detection unit 119 detects the attachment of the interchangeable lens 200 when the signal level of the body side contact point BP6 becomes the signal level corresponding to the truth value L. When the body-side control unit 103 detects that the interchangeable lens 200 is attached to the camera body 100, the body-side control unit 103 starts power supply to the interchangeable lens 200 and starts a communication operation with the interchangeable lens 200.

  FIG. 6B is a timing chart showing how the lens attachment / detachment detection unit 119 detects the removal of the interchangeable lens 200. When the interchangeable lens 200 is removed from the camera body 100, the signal level of the body side contact BP6 again becomes the signal level corresponding to the truth value H (T11). At this time, the lens attachment / detachment detection unit 119 indicates that the change in the signal level is caused by the lens-side first communication unit 217 outputting a signal to the signal line RDY, or the interchangeable lens 200 is removed. It cannot be distinguished whether it was caused by

  When the signal level of the body side contact point BP6 becomes a signal level corresponding to the truth value H, the lens attachment / detachment detection unit 119 changes the signal level of the body side contact point BP6 to the above-mentioned specified time (in FIG. 4). In the explanation of the above, determine whether or not to maintain the above.

  If the change in the signal level generated at the time T11 is caused by the lens-side first communication unit 217, the signal level of the body-side contact BP6 is the truth value L before the specified time elapses from the time T11. Should return to the signal level corresponding to. On the other hand, if the signal level of the body-side contact BP6 remains the signal level corresponding to the truth value H even after the specified time has elapsed, this is the signal level due to the interchangeable lens 200 being removed. It can be determined that this is a change. Accordingly, the lens attachment / detachment detection unit 119 detects the removal of the interchangeable lens 200 at time T12 when a predetermined time T1112 has elapsed from time T11.

  As described above, the lens attachment / detachment detection unit 119 detects the removal of the interchangeable lens 200 when the signal level of the body side contact BP6 is the signal level corresponding to the truth value H continuously for the predetermined time or more. In this embodiment, the signal level of the body side contact point BP6 corresponding to the truth value H, which is a period (time) serving as a determination reference for the lens attachment / detachment detection unit 119 to detect (determine) the removal of the interchangeable lens. The period for maintaining (continuing) the signal level is set to “regular time or longer”. The “predetermined time or more” may be the specified time itself, or may be longer than the specified time (for example, about several times the specified time).

  In addition, as a case where the signal level of the body side contact BP6 becomes the signal level corresponding to the truth value H continuously for the specified time or more, a case other than the above-described removal of the interchangeable lens 200 may be considered. For example, a case where the interchangeable lens is still attached but the interchangeable lens side is hung up, or a case where the communication contact is defective. As for the body side control unit 103 of the camera body 100, the signal level of the body side contact point BP6 is continuously set to the signal level corresponding to the truth value H for at least the specified time regardless of the reason (factor). When it is detected that the power supply is turned off, the power supply to the interchangeable lens 200 is cut off.

  As a result, even when the signal level of the signal line RDY on the interchangeable lens side is kept at the H level in cases such as the above-described hang-up and communication contact failure, power is supplied from the camera side to the interchangeable lens side. Since it is once turned off, the operation of the lens side control unit 203 is stopped by this, and the lens side contact LP6 becomes a level via the pull-down resistor R2. That is, since the signal level of the signal line RDY on the interchangeable lens side becomes L level, the camera body 100 behaves in the same manner as described with reference to FIG. That is, the lens attachment / detachment detection unit 119 on the camera body side recognizes that the interchangeable lens has been reattached, and the body side control unit 103 starts power supply and communication with the interchangeable lens 200.

According to the camera system according to the first embodiment described above, the following operational effects can be obtained. (1) The interchangeable lens 200 includes a lens-side first communication unit 217 that performs data communication with the camera body 100 by exchanging signals with the camera body 100 via the lens-side contacts LP3 to LP6. The lens-side contact LP6 is connected to the body-side contact BP6 used by the camera body 100 for attachment / detachment detection, and the lens-side first communication unit 217 outputs a signal that is neither a data signal nor a clock signal to the lens-side contact LP6. When the camera body 100 is attached to the side mount portion 201, the lens side contact LP6 is controlled so that the signal level of the body side contact BP6 does not continuously become a signal level corresponding to the truth value H for a predetermined time or more. The lens side contact LP6 is configured such that the signal level of the body side contact BP6 becomes a signal level corresponding to the truth value L when the camera body 100 is attached and data communication by the lens side first communication unit 217 is not performed. Is done. Since it did in this way, attachment / detachment detection of a lens can be performed with a simple communication procedure.

(2) The camera body 100 includes a body-side first communication unit 117 that performs data communication with the interchangeable lens 200 by exchanging signals with the interchangeable lens 200 via the body-side contacts BP3 to BP6, A lens attachment / detachment detection unit 119 that detects attachment / detachment of the interchangeable lens 200 based on the signal level of the side contact BP6. The body-side contact BP6 is connected to the lens-side contact LP6 from the lens-side contacts LP3 to LP6, which is not a data signal or a clock signal, and is output from the interchangeable lens 200. Is not attached, the signal level becomes a signal level corresponding to the truth value H, the interchangeable lens 200 is attached to the body side mount unit 101, and communication by the body side first communication unit 117 is not performed. Is configured so that the signal level corresponds to the truth value L. When the interchangeable lens 200 is attached to the body side mount unit 101, the first body side communication unit 117 has a signal level corresponding to the truth value H continuously for a predetermined time or more via the body side contact BP6. The lens attachment / detachment detection unit 119 detects the removal of the interchangeable lens 200 when the signal level of the body side contact BP6 is a signal level corresponding to the truth value H continuously for a predetermined time or longer. When the signal level of the body side contact BP6 becomes a signal level corresponding to the truth value L, the attachment of the interchangeable lens 200 is detected. Since it did in this way, attachment / detachment detection of a lens can be performed with a simple communication procedure.

(3) In the data communication with the camera body 100, the first lens side communication unit 217 sets the lens side contacts LP3 to LP6 so that the change in the signal level of the lens side contact LP6 among the lens side contacts LP3 to LP6 is minimized. Control. Since it did in this way, the circuit design of the lens side 1st communication part 217 and the lens side contacts LP3-LP6 becomes easy.

(4) The interchangeable lens 200 includes the lens body contacts LP7 to LP10 connected to the body side contacts BP7 to BP10 that the camera body 100 has for hot line communication, and the camera body 100 via the lens side contacts LP7 to LP10. And a lens-side second communication unit 218 that performs data communication with each other. In the data communication with the camera body 100, the second lens side communication unit 218 controls the lens side contacts LP3 to LP6 so that the change in the signal level of the lens side contact LP6 among the lens side contacts LP3 to LP10 is minimized. Since it did in this way, the circuit design of the lens side 1st communication part 217 and the lens side 2nd communication part 218 becomes easy.

(5) The lens side contact LP6 is grounded through the pull-down resistor R2 in the interchangeable lens 200. Thus, when the interchangeable lens 200 is attached to the camera body 100, the signal level of the body side contact BP6 changes to a signal level corresponding to the truth value L, and the attachment / detachment detection unit 119 can detect attachment.

(Second Embodiment)
FIG. 7 is a perspective view showing a camera system according to the second embodiment. The camera system 2 of the present embodiment includes a camera body 100, an intermediate adapter 700 that can be attached to and detached from the camera body 100, and an interchangeable lens 600 that can be attached to and detached from the intermediate adapter 700. In the following description, the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and the description thereof is omitted.

  The interchangeable lens 600 is an interchangeable lens that can be attached to and detached from a camera body having a mounting standard different from that of the camera body 100. That is, the lens side mount portion 601 of the interchangeable lens 600 cannot be attached because the mount standard is different from that of the body side mount portion 101 of the camera body 100. Further, in the vicinity of the lens-side mount portion 601 of the interchangeable lens 600, a holding portion 602 provided with a plurality of contact points is present in the same manner as the interchangeable lens 200 shown in FIG. It is different from the holding unit 102.

  The intermediate adapter 700 is a mount adapter for attaching the interchangeable lens 600 as described above to the camera body 100. Specifically, the housing of the intermediate adapter 700 has a cylindrical shape. On one side surface of the intermediate adapter 700, a first mount portion 701 corresponding to the body side mount portion 101 (which is a mount standard corresponding to the body side mount portion 101) is provided. On the other side surface of the intermediate adapter 700, a second mount portion 703 corresponding to the lens side mount portion 601 (which is a mount standard corresponding to the lens side mount portion 601) is provided. The shape of the housing is not limited to the cylindrical shape, and may be other shapes. The first mount portion 701 can be detachably attached to the body side mount portion 101 of the camera body 100. The second mount portion 703 can be detachably attached to the lens side mount portion 601 of the interchangeable lens 600.

  Similar to the interchangeable lens 200 according to the first embodiment, the inner periphery of the first mount portion 701 is located near the first mount portion 701 of the intermediate adapter 700 (inner peripheral side of the first mount portion 701). A holding portion 702 for holding the contact is provided in a state of partially protruding to the side. The holding portion 702 is provided with a plurality of contacts. When the intermediate adapter 700 is attached to the camera body 100, the holding unit 702 provided with a plurality of contacts is electrically and physically connected to the holding unit 102 provided with a plurality of contacts. Since the first mount unit 701 and the holding unit 702 have the same configuration as the lens side mount unit 201 and the holding unit 202 according to the first embodiment, further description is omitted.

  Further, a contact is held at a position in the vicinity of the second mount portion 703 of the intermediate adapter 700 (inner peripheral side of the second mount portion 703) in a state of partially protruding toward the inner peripheral side of the second mount portion 703. A holding portion 704 is provided. The holding portion 704 is provided with a plurality of contacts. A holding portion 602 that holds a contact point is provided at a position near the lens-side mount portion 601 of the interchangeable lens 600. The holding portion 602 is provided with a plurality of contacts. When the interchangeable lens 600 is attached to the intermediate adapter 700, the holding unit 602 provided with a plurality of contacts is electrically and physically connected to the holding unit 704 provided with a plurality of contacts.

The camera body 100 detects the attachment / detachment of the intermediate adapter 700 in the same manner as the attachment / detachment detection of the interchangeable lens 200 in the first embodiment. That is, the configuration of each contact provided in the holding unit 702 of the intermediate adapter 700 is the same as each contact provided in the holding unit 202 of the interchangeable lens 200 according to the first embodiment. For example, as described in the first embodiment, the holding portion 702 is provided with lens side contacts LP1 to LP12. When the intermediate adapter 700 is attached, the lens side contact LP6 provided in the holding portion 702 is pulled down, so that the signal level of the body side contact BP6 becomes a signal level corresponding to the truth value L. Thus, the lens attachment / detachment detection unit 119 detects the attachment of the intermediate adapter 700 when the signal level of the body side contact BP6 becomes the signal level corresponding to the truth value L. When the body-side control unit 103 detects that the intermediate adapter 700 is attached to the camera body 100, the body-side control unit 103 starts power supply to the intermediate adapter 700 and starts a communication operation with the intermediate adapter 700. The intermediate adapter 700 mediates communication between the interchangeable lens 600 and the camera body 100 via each communication contact provided in the holding unit 704.

  Further, the intermediate adapter 700 has an adapter controller (not shown). This adapter control unit performs a communication operation with the body control unit 103 in the same manner as the lens control unit 203 of the interchangeable lens 200. The adapter control unit is provided in the intermediate adapter 700. Drive control of a driving member (for example, a diaphragm driving lever for driving a diaphragm blade provided in the interchangeable lens 600) is performed. The adapter controller further performs the same control as the control performed on the signal level of the lens side contact LP6 of the interchangeable lens 200 while the intermediate adapter 700 is attached to the camera body 100. In other words, while the camera body 100 is attached to the first mount unit 701, the adapter control unit continuously maintains the truth value of the signal level of the intermediate adapter contact corresponding to the lens side contact LP6 for the specified time or more. The contact of the intermediate adapter corresponding to the lens side contact LP6 is controlled so that the signal level does not correspond to H.

  When the intermediate adapter 700 is removed from the camera body 100, the signal level of the body side contact BP6 again becomes the signal level corresponding to the truth value H. The lens attachment / detachment detection unit 119 detects the removal of the interchangeable lens 200 when the signal level of the body-side contact BP6 remains the signal level corresponding to the truth value H even after the above-mentioned specified time has elapsed. .

  According to the camera system of the second embodiment described above, the same effects as those of the first embodiment can be obtained even in the intermediate adapter.

  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)
In the hotline communication, the lens side second communication unit 218 may transmit data other than the lens position data. For example, data relating to the aperture of the diaphragm or data relating to the position of the shake correction lens may be transmitted.

(Modification 2)
When the position of the focusing lens 210b is unnecessary, such as a manual focus lens, the lens side contacts LP7 to LP10 and the lens side second communication unit 218 may be omitted. Since the lens attachment / detachment detection unit 119 detects attachment / detachment of the interchangeable lens 200 by the body side contact BP6, it can correctly detect attachment / detachment even when these lens side contacts LP7 to LP10 used for hotline communication are not present. Is possible.

(Modification 3)
The present invention can also be applied to a camera system with interchangeable lenses having a configuration different from the configuration shown in the above embodiment. For example, the present invention can be applied to a so-called single-lens reflex camera having a mirror in the camera body, and the same effects as those of the above-described embodiment can be obtained.

(Modification 4)
In the second embodiment, the intermediate adapter may be a so-called wide converter (wicon) or teleconverter (telecon) having a predetermined optical system. As an example of such a configuration, a camera system 3 is shown in FIG. An intermediate adapter 800 included in the camera system 3 is mounted between the camera body 100 and the interchangeable lens 200 according to the first embodiment, and is attached to the third mount unit 801 corresponding to the camera body 100 and the interchangeable lens 200. And a corresponding fourth mount portion 803, and the focal length of the optical system of the interchangeable lens 200 is increased by a predetermined magnification. The present invention can also be applied to such an intermediate adapter 800.

  In FIG. 8, a holding portion 802 connected to the holding portion 102 of the camera body 100 is provided in the vicinity of the third mount portion 801. In addition, a holding unit 804 connected to the holding unit 202 of the interchangeable lens 200 is provided in the vicinity of the fourth mount unit 803. In this case, each contact of the holding unit 802 may be configured such that a signal input (output) to the contact is through-output (input) to each corresponding contact of the holding unit 804. Alternatively, a microprocessor (control unit) (not shown) in the intermediate adapter 800 may be configured to perform communication in one holding unit and then return the result by performing communication in the other holding unit. . In this case, each contact point of the holding unit 802 is configured in the same manner as the holding unit 202 in the first embodiment. For example, a terminal used for attachment / detachment detection is grounded via a pull-down resistor inside the intermediate adapter 800, and the microprocessor in the intermediate adapter 800 controls this terminal as in the first embodiment. Further, in the microprocessor in the intermediate adapter 800, while the camera body 100 is attached to the third mount portion 801, the signal level of the contact of the intermediate adapter 800 corresponding to the lens side contact LP6 is continuous for the specified time or more. Thus, the contact of the intermediate adapter 800 corresponding to the lens side contact LP6 is controlled so that the signal level does not correspond to the truth value H.

(Modification 5)
In each of the embodiments described above, the present invention is applied to an interchangeable lens, an intermediate adapter, and the like that can be attached to and detached from the camera body. The present invention can also be applied to accessories other than interchangeable lenses and intermediate adapters that can be attached to and detached from the camera body.

  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, 2, 3 ... Camera system, 100 ... Camera body, 101 ... Body side mount part, 102, 202, 602, 702, 704, 802, 804 ... Holding part, 103 ... Body side control part, 117 ... Body side 1st DESCRIPTION OF SYMBOLS 1 Communication part, 118 ... Body side 2nd communication part, 119 ... Lens attachment / detachment detection part, 200, 600 ... Interchangeable lens, 201, 601 ... Lens side mount part, 203 ... Lens side control part, 217 ... Lens side 1st communication , 218... Lens side second communication unit, 700, 800... Intermediate adapter

Claims (1)

An interchangeable lens that can be attached to and detached from the camera body,
A first voltage indicating that the interchangeable lens can perform data communication with the camera body, and the interchangeable lens cannot perform data communication when attached to the camera body; A contact that outputs a second voltage higher than the first voltage,
A pull-down resistor electrically connected to the contact;
Interchangeable lens with

Images