JP6642621B2 - interchangeable lens - Google Patents

Description

  The present invention relates to an interchangeable lens.

  Conventionally, there has been known a camera in which a photographer can manually set a focus position of an optical system by operating a manual focus ring. In such a camera, when a photographer operates a manual focus ring provided on a lens barrel, a movement amount of the manual focus ring is detected by a sensor, and a focus lens is driven in accordance with the movement amount.

  A camera provided with a manual focus ring is described in, for example, Patent Document 1. In the camera described in Patent Literature 1, power is saved by turning on or off a power supply of a sensor that detects a movement amount of a manual focus ring according to a preset shooting mode.

JP-A-2004-48160

  The prior art has a problem that the amount of movement detected by moving the manual focus ring is always constant, and it is not possible to perform flexible control according to the operation mode of the camera body.

An interchangeable lens according to the present invention is an interchangeable lens that can be mounted on a camera body, has an optical system having a movable focus lens, an operation member that moves by operation and outputs a movement amount, and is instructed from the camera body. A first mode in which the focus lens is moved by a moving amount of the operating member, a second mode in which the focus lens is moved by a driving amount based on the moving amount of the operation member, and the focus in a driving amount instructed by the camera body. A third mode capable of switching between movement of the lens and movement of the focus lens with a drive amount based on the movement amount of the operation member is received from the camera body to control the focus lens. And a detection unit capable of detecting the amount of movement of the operation member. When a mode is received, if the moving amount of the operating member detected by the detection unit after the operation of the operating member is started is less than a predetermined amount, information indicating that the operating member has not moved. Is transmitted to the camera body, and when the moving amount of the operating member is equal to or more than the predetermined amount, information indicating the moving amount of the operating member detected by the detection unit is transmitted to the camera body, and the camera body When the second mode is received from the control unit, the information indicating the movement amount of the operation member detected by the detection unit after the operation of the operation member is started is transmitted to the camera body.

  According to the present invention, an easy-to-use camera system can be provided.

1 is a perspective view showing a camera system of an interchangeable lens type to which the present invention is applied. FIG. 1 is a cross-sectional view illustrating a lens-interchangeable camera system to which the present invention is applied. FIG. 3 is a schematic diagram showing details of holding units 102 and 202. 5 is a timing chart illustrating an example of command data communication. 6 is a timing chart illustrating an example of hot line communication. FIG. 9 is a diagram illustrating a circuit configuration of a first photo interrupter 213a and a second photo interrupter 213b. It is a figure showing the relation of the installation position of the 1st photo interrupter 213a and the 2nd photo interrupter 213b. FIG. 9 is a diagram illustrating a waveform example of a detection signal of a first photo interrupter 213a and a second photo interrupter 213b. FIG. 9 is a schematic diagram illustrating a relationship between detection signals of a first photo-interrupter 213a and a second photo-interrupter 213b. 5 is a flowchart of a control process executed by a body control unit 103 and a lens control unit 203. 5 is a flowchart of a state transition process executed by a body control unit. 5 is a flowchart of a state transition process executed by a lens control unit.

(First Embodiment)
Hereinafter, a lens-interchangeable digital camera according to a first embodiment of the present invention will be described. In the following description, portions particularly related to the present invention will be described, and illustration and description of other portions will be omitted.

  FIG. 1 is a perspective view showing a camera system of an interchangeable lens type 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 apparatuses and apparatuses are omitted. The camera system 1 includes a camera body 100 and an interchangeable lens 200 detachable from the camera body 100.

  The camera body 100 is provided with a body-side mount unit 101 to which the interchangeable lens 200 is detachably attached. At a position near the body-side mount portion 101 (on the inner circumference side of the body-side mount portion 101), a holding portion (electrical portion) that holds the contact while partially protruding toward the inner circumference side of the body-side mount portion 101 is provided. ) 102 is provided. The holding portion 102 is provided with a plurality of contacts.

  Further, the interchangeable lens 200 is provided with a lens-side mount unit 201 corresponding to the body-side mount unit 101 and to which the camera body 100 is detachably mounted. At a position near the lens-side mount portion 201 (on the inner peripheral side of the lens-side mount portion 201), a holding portion (electrical portion) that holds a contact while partially protruding toward the inner peripheral side of the lens-side mount portion 201 is provided. Connection unit) 202 is provided. The holding section 202 is provided with a plurality of contacts.

  When the interchangeable lens 200 is mounted on the camera body 100, the holding portion 102 of the camera body 100 provided with a plurality of contacts is electrically and electrically connected to the holding portion 202 of the interchangeable lens 200 provided with a plurality of contacts. Physically connected. Both holding units 102 and 202 are used for power supply from the camera body 100 to the interchangeable lens 200 and for transmission and reception of signals between the camera body 100 and the interchangeable lens 200.

  An image sensor 104 such as a CMOS or a CCD is provided behind the body-side mount unit 101 in the camera body 100. Above the camera body 100, there is provided a well-known two-stage operation type (a configuration capable of half-pressing operation and full-pressing operation) 105 (release button). The user uses the release switch 105 or an operation member (not shown) to instruct the camera body 100 to take a photograph or set photographing conditions. The lens barrel of the interchangeable lens 200 is provided with a focus ring 219 that is an operation member that can be rotated.

  FIG. 2 is a 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 210d arranged on the same optical axis O. The plurality of lenses 210a to 210d include a focus lens 210c for adjusting a focus position of a subject image.

  Inside the interchangeable lens 200, a lens control unit 203 that controls each unit of the interchangeable lens 200 is provided. The lens control unit 203 includes a microcomputer (not shown) and its peripheral circuits. The lens control section 203 is connected to a lens-side first communication section 217, a lens-side second communication section 218, a focus drive section 214, a ROM 215, a RAM 216, a first photo interrupter 213a, and a second photo interrupter 213b.

  The lens-side first communication unit 217 and the lens-side second communication unit 218 transmit and receive signals to and from the camera body 100 via respective 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. The lens control unit 203 performs each communication (hot line communication, command data communication) described later with the camera body 100 (a body control unit 103 described later) using these communication interfaces.

  The focus drive unit 214 has a motor (for example, an actuator such as a stepping motor) that generates a driving force, and a transmission system (for example, a combination of a plurality of gears) that transmits the driving force to the focus lens 210c. The focus drive unit 214 is controlled by the lens control unit 203, and drives the focus lens 210c in the optical axis O direction at a drive speed specified by the lens control unit 203.

  The first photo-interrupter 213a and the second photo-interrupter 213b are members for detecting the rotation (rotation operation amount or movement amount and rotation direction or movement direction) of the focus ring (operation member or movement member) 219. On the inner peripheral surface of the focus ring 219, shielding plates of the same shape (substantially square) are provided at regular intervals in the circumferential direction. The shield plate blocks light incident on the light receiving elements of the first photo-interrupter 213a and the second photo-interrupter 213b, thereby causing a change in detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b. Accordingly, the lens control unit 203 operates the focus ring 219 (movement amount) and operation direction (movement direction) (hereinafter, these operation amounts and operation directions are collectively referred to as “operation information of the focus ring 219 (operation member)”. ) May be detected).

  The lens control unit 203 is configured to be able to acquire the position of the focus lens 210c on the optical axis O. For example, the position of the focus lens 210c may be detected by providing an encoder (not shown), or the position may be detected by monitoring an input signal to an actuator (such as a stepping motor) that drives the focus lens 210c. It may be.

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

  On the front surface of the image sensor 104, 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. The subject light transmitted through the imaging optical system 210 enters the image sensor 104 via the shutter 115 and the filter 116.

  Inside the camera body 100, there is provided a body control unit 103 which controls each part of the camera body 100. The body control unit 103 includes a microcomputer, a RAM, and its peripheral circuits (not shown).

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

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

(Description of Holders 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 disposed on the right side of the body-side mounting portion 101 in accordance with an actual mounting structure. That is, the holding unit 102 of the present embodiment is disposed at a position deeper than the mounting surface of the body-side mount unit 101 (a position on the right side of the body-side mount unit 101 in FIG. 3). Similarly, the reason why the holding unit 202 is disposed on the right side of the lens-side mounting unit 201 is that the holding unit 202 of the present embodiment is disposed at a position protruding from the mounting surface of the lens-side mounting unit 201. Represents. Since the holding unit 102 and the holding unit 202 are arranged in this manner, the mounting surface of the body-side mounting unit 101 and the mounting surface of the lens-side mounting unit 201 are brought into contact, and the camera body 100 and the interchangeable lens 200 are mounted. When coupled, the holding unit 102 and the holding unit 202 are connected, and the electrical contacts provided on both holding units are also connected. Since such a mounting structure is well known, further description and illustration are omitted.

  As shown in FIG. 3, the holding unit 102 has twelve contacts BP1 to BP12. The holding unit 202 has twelve contacts LP1 to LP12 corresponding to the twelve contacts, respectively.

  The contact BP1 and the contact BP2 are connected to a first power supply circuit 130 in the camera body 100. The first power supply circuit 130 supplies an operating voltage of each unit in the interchangeable lens 200 to the contact point BP1 except for a circuit having a driving system such as an actuator and having relatively large power consumption (such as the focus driving unit 214). That is, the operating voltage of each unit in the interchangeable lens 200 excluding the above-described driving units is supplied from the contact point BP1 and the contact point LP1. The voltage value that can be supplied to the contact point BP1 has a range from a minimum voltage value to a maximum voltage value (for example, a voltage width on the order of 3V), and the voltage value supplied normally is the maximum voltage value and the minimum voltage value. Is a voltage value near the intermediate value of. Thus, the current value supplied from the camera body 100 to the interchangeable lens 200 is in the range of about several tens mA to several hundred mA when the power is on.

  The contact BP2 is a ground terminal corresponding to the operating voltage applied to the contact BP1. That is, the contact point BP2 and the contact point LP2 are at the ground terminal voltage corresponding to the operating voltage described above.

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

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

  In the following description, a signal line formed by the contact BP3 and the contact LP3 is referred to as a signal line CLK. Similarly, a signal line composed of the contact points BP4 and LP4 is a signal line BDAT, a signal line composed of the contact points BP5 and LP5 is a signal line LDAT, and a signal line composed of the contact points BP6 and LP6 is a signal line. 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 a signal to the body-side second communication unit 118 using these contacts (communication system contacts). The details of the communication performed by the body-side second communication unit 118 and the lens-side second communication unit 218 will be described later in detail.

  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 constituted by the contact points BP8 and LP8 is represented by a signal line HANS, a signal line constituted by the contact points BP9 and LP9 is represented by a signal line HCLK, and a signal line constituted by the contact points BP10 and LP10 is represented by a signal. Called line HDAT.

  The contact BP11 and the contact BP12 are connected to a second power supply circuit 131 in the camera body 100. The second power supply circuit 131 supplies, to the contact point BP12, a drive voltage of a circuit (such as the focus drive unit 214) having a drive system such as an actuator and having relatively large power consumption. That is, the driving voltage of the focus driving unit 214 is supplied from the contact points BP12 and LP12. The voltage value that can be supplied to the contact BP12 has a range from a minimum voltage value to a maximum voltage value, and each of the ranges is a voltage value larger than the voltage value range that can be supplied to the contact BP1 described above (for example, The maximum voltage value that can be supplied to the contact BP12 is about several times the maximum voltage value that can be supplied to the contact BP1). That is, the voltage value supplied to the contact BP12 is a voltage value different in magnitude from the voltage value supplied to the contact BP1 described above. The voltage value supplied to the contact BP12 as a standard is a voltage value near an intermediate value between the maximum voltage value and the minimum voltage value that can be supplied to the contact BP12. Thus, the current supplied from the camera body 100 to the interchangeable lens 200 has a current value of about 10 mA to several A when the power is on.

  The contact BP11 is a ground terminal corresponding to the drive voltage applied 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 formed by the contact BP11 and the contact LP11 is referred to as a signal line PGND. A signal line formed by the contact points BP12 and LP12 is referred to as a signal line BAT. These contacts LP11, LP12, BP11, BP12 constitute power system contacts for supplying power from the camera body 100 to the interchangeable lens 200.

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

(Explanation of command data communication)
The lens control unit 203 controls the lens-side first communication unit 217 to transmit 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. The reception and the transmission of the response data to the body-side first communication unit 117 are performed in parallel at a first predetermined cycle (for example, 16 milliseconds in the present 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 between the body control unit 103 and the body-side first communication unit 117 is referred to as “command data communication”. Further, a transmission line including 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. At the start of the command data communication (T1), the body control unit 103 and the body-side first communication unit 117 first confirm the signal level of the signal line RDY. The signal level of the signal line RDY indicates whether communication of the lens-side first communication unit 217 is possible. When communication is not possible, the lens control unit 203 and the lens-side first communication unit 217 output an H (High) level signal from the contact point LP6. That is, the signal level of the signal line RDY is set to the 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 goes to the L level. Also, the next process during communication is not executed.

  If the signal line RDY is at the L (Low) level, the body control unit 103 and the body-side first communication unit 117 output the clock signal 401 from the contact BP3. That is, the clock signal 401 is transmitted to the first lens side communication unit 217 via the signal line CLK. The body control section 103 and the body-side first communication section 117 output a body-side command packet signal 402 as the first half of the control data from the contact point BP4 in synchronization with the clock signal 401. 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 first lens-side communication unit 217 synchronize with the clock signal 401 from the contact LP5 to the lens-side command packet which is the first half of the response data. 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 change the signal level of the signal line RDY to the H level in response to the completion of the transmission of the lens-side command packet signal 403 (T2). The lens control unit 203 starts a first control process 404 (described later) which 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. The lens-side first communication unit 217 outputs an L-level signal from the contact point LP6 in response to the notification. That is, the signal level of the signal line RDY is set to the L level (T3). The body control unit 103 and the body-side first communication unit 117 output a clock signal 405 from the contact BP3 according to 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 section 103 and the body-side first communication section 117 output a body-side data packet signal 406, which 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.

  When the clock signal 405 is output to the signal line CLK, the lens control unit 203 and the first lens-side communication unit 217 synchronize with the clock signal 405 and output the lens-side data packet signal, which is the latter half of the response data, from the contact LP5. 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.

  The lens control unit 203 and the lens-side first communication unit 217 change the signal level of the signal line RDY to the H level again in response to the completion of the transmission of the lens-side data packet signal 407 (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.

  Here, the first control processing 404 and the second control processing 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. The lens control unit 203 performs, as the first control process 404, a process of analyzing the content of the body side command packet signal 402 and 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 body side command packet signal 402 to determine whether there is an error in the communication of the command packet signal 402 based on the number of data bytes. A communication error check process for simply checking is also executed. The specific data signal generated in the first control process 404 is output to the body 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 on the lens side. In this case, the lens control unit 203 executes the above-described communication error check processing using the checksum data included in the body side data packet signal 406 as the second control processing 408.

  Further, for example, a case will be described in which the received body side command packet signal 402 is an instruction to drive a driven member on the lens side. For example, a case where the command packet signal 402 is a driving instruction of the focus lens 210c and the received body side data packet signal 406 is a driving amount of the focus lens 210c will be described. The lens control unit 203 analyzes the contents of the command packet signal 402 and generates an acknowledgment signal indicating that the contents are understood as the first control processing 404. Further, the lens control unit 203 also performs the above-described communication error check processing as the first control processing 404 by using the checksum data included in the command packet signal 402. The acknowledgment signal generated in the first control processing 404 is output to the body as a lens-side data packet signal 407. In addition, the lens control unit 203 executes, as the second control process 408, a process of analyzing the content of the body-side data packet signal 406, and performs a communication error as described above using the checksum data included in the body-side data packet signal 406. Perform check processing.

  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 point LP6. That is, the signal level of the signal line RDY is set to the L level (T5).

  When the received body-side command packet signal 402 is an instruction to drive the lens-side driven member (for example, the focus lens 210c) 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 signal line RDY is set to the L level, the focus driving unit 214 is caused to execute a process of driving the focus lens 210c by the driving amount.

  The communication performed from time T1 to time T5 is one command data communication. As described above, in one command data communication, one body-side command packet signal 402 and one body-side data packet signal 406 are transmitted by the body control unit 103 and the body-side first communication unit 117, respectively. That is, although the data is divided into two and transmitted for the sake of processing, the body-side command packet signal 402 and the body-side data packet signal 406 together form one control data.

  Similarly, in one command data communication, one lens-side command packet signal 403 and one lens-side data packet signal 407 are transmitted by the lens 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 together form one response data.

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

(Explanation 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 “hot line communication”. Further, a transmission line including 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 hot line communication. The body control unit 103 according to the present embodiment is configured to start the hot line communication every second predetermined cycle (for example, 1 millisecond in the present embodiment). This cycle is shorter than the cycle in which command data communication is performed. FIG. 5A is a diagram illustrating a state in which hot line communication is repeatedly executed at a predetermined cycle Tn. FIG. 5B shows a state in which the period Tx of a certain communication among the repeatedly executed hot line communication is enlarged. Hereinafter, the procedure of the hot line communication will be described with reference to the timing chart of FIG.

  When the hot line communication is started (T6), the body control section 103 and the body side second communication section 118 first output an L level signal from the contact 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 point LP7. In response to this notification, the lens control unit 203 starts executing a generation process 501 for generating lens position data. The generation processing 501 is processing in which the lens control unit 203 causes a focusing lens position detection unit (not shown) to detect the position of the focus lens 210c, and generates lens position data representing the detection result.

  When the lens control unit 203 completes the generation processing 501, the lens control unit 203 and the lens-side second communication unit 218 output an L-level signal from the contact point LP8 (T7). That is, the signal level of the signal line HANS is set to the L level. Body control section 103 and body-side second communication section 118 output clock signal 502 from contact BP9 in response to this signal being input to 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 lens-side second communication unit 218 output a lens position data signal 503 indicating the lens position data from the contact point LP10 in synchronization with the clock signal 502. That is, the lens position data signal 503 is transmitted to the second body communication section 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 lens-side second communication unit 218 output an H-level signal from the contact point LP8. That is, the signal level of the signal line HANS is set to the H level (T8). Body side second communication section 118 outputs an H level signal from contact point LP7 in response to the input of this signal to contact point BP8. That is, the signal level of the signal line HREQ is set to the H level (T9).

  The communication performed from time T6 to time T9 is one hotline communication. As described above, in one hotline 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 hot line 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 to which an asynchronous signal (signal level / H (High) level or L (Low) level of the signal line HREQ) is transmitted, and the contacts LP8 and BP8 are asynchronous signals (signal line HANS). (H (High) level or L (Low) level).

  It should be noted that the command data communication and the hot line communication can be executed simultaneously or partially in parallel. That is, one of the first lens-side communication unit 217 and the second lens-side 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 focus ring 219)
FIG. 6 is a diagram illustrating a circuit configuration of the first photo interrupter 213a and the second photo interrupter 213b. Note that the circuit configurations of the first photo interrupter 213a and the second photo interrupter 213b are the same.

  As shown in FIG. 6, the first photo-interrupter 213a is a sensor in which a light emitting diode 161a and a light receiving element 162a are paired. The detection signal of the light receiving element 162a of the first photo interrupter 213a is output to the lens control unit 203. The second photo-interrupter 213b is a sensor configured by a light emitting diode 161b and a light receiving element 162b forming a pair. The detection signal of the light receiving element 162b of the second photo interrupter 213b is output to the lens control unit 203.

  The first photo-interrupter 213a and the second photo-interrupter 213b are turned on or off by the lens control unit 203. The detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b are signals of a level corresponding to the amount of light received by the light receiving elements 162a and 162b, and correspond to a high level corresponding to the amount of light (luminance) of the light emitting diodes 161a and 161b. The threshold value Th for determining the detection signal is determined in advance.

  FIG. 7 is a diagram illustrating the relationship between the installation positions of the first photo interrupter 213a and the second photo interrupter 213b. In FIG. 7, the first photo interrupter 213a and the second photo interrupter 213b have phases shifted from each other by 90 degrees (1/4 cycle) with respect to the cycle of the installation interval of the shielding member of the focus ring 219 in the circumferential direction. It is installed in. In other words, the first photo-interrupter 213a and the second photo-interrupter 213b have a relationship of installation positions where the rotation direction of the focus ring 219 can be detected based on the detection timing of the shielding members.

  Specifically, when the focus ring 219 is rotated in one direction by user operation and rotated, the shielding member blocks light incident on the light receiving element 162a of the first photointerrupter 213a, and is delayed by 1/4 cycle. One of the shield plates has a positional relationship of blocking light incident on the light receiving element 162b of the second photo interrupter 213b. When the focus ring 219 is rotated in the opposite direction and rotated, the shielding member blocks light incident on the light receiving element 162b of the second photointerrupter 213b, and is delayed by 周期 cycle, and The shielding plate has a positional relationship of blocking light incident on the light receiving element 162a of the first photo interrupter 213a. The detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b are changed from a high level (that is, an output level equal to or more than the set threshold Th) to a low level (that is, set) when the shielding member of the focus ring 219 passes. (The output level below the threshold value Th). This allows the lens control unit 203 to detect the rotation direction of the focus ring 219.

  FIG. 8 is a diagram illustrating a waveform example of a detection signal of each of the first photo-interrupter 213a and the second photo-interrupter 213b when the focus ring 219 is operated. FIG. 9 is a schematic diagram showing a relationship between detection signals of the first photo interrupter 213a and the second photo interrupter 213b when the focus ring 219 is operated.

  As shown in FIGS. 8 and 9, when the focus ring 219 is manually operated by the photographer, a pulse-like detection signal is output from each of the first photo-interrupter 213a and the second photo-interrupter 213b (time t1). To t24). Since each of the detection signals output at this time is manually operated, the frequency becomes uneven on the time axis. On the other hand, the detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b have a correlation. In the example shown in FIG. 9, the detection signal of the first photo-interrupter 213a is different from that of the second photo-interrupter 213b. The detection signal is delayed by a quarter cycle. Note that, when the rotation direction of the focus ring 219 is reversed, the detection signal of the first photo-interrupter 213a is １ ／ cycle of the detection signal of the second photo-interrupter 213b, contrary to the example shown in FIG. The relationship is delayed. Therefore, the lens control unit 203 detects the rotation direction of the focus ring 219 by determining which of the detection signal of the first photo-interrupter 213a and the detection signal of the second photo-interrupter 213b becomes the high level first. be able to.

(Description of operation mode of camera body 100)
In the camera body 100, an M / A mode, an MF mode, and an MF prohibition mode, which will be described later, can be selectively set as operation modes related to focus adjustment. The user can alternatively set the M / A mode, the MF mode, or the MF prohibition mode for the camera body 100 from a menu screen or the like, for example.

  The M / A mode is a focus mode in which a manual focus (MF) mode and an auto focus (AF) mode are appropriately switched, and the MF mode and the AF mode are used together. In the M / A mode, the AF mode is used in principle, but when the user operates the focus ring 219 to perform a manual focus operation, the focus mode is automatically switched from the AF mode to the MF mode in accordance with the operation. Mode. When the user performs a predetermined AF operation (for example, half-pressing the release switch 105) while the M / A mode is set, the body control unit 103 executes a known automatic focus adjustment process. By the automatic focus adjustment processing, the focus lens 210c is driven to the in-focus position, and the imaging position of the subject image is set on the imaging surface of the imaging device 104. When the M / A mode is set, the user can manually adjust the focus position by operating the focus ring 219. For example, if the focus ring 219 is operated during execution of the automatic focus adjustment processing, the automatic focus adjustment processing is interrupted, and the focus lens 210c is driven according to the operation of the focus ring 219.

  When the MF mode is set, the body control unit 103 does not execute the automatic focus adjustment process even if the user performs the above-described AF operation. When the MF mode is set, the focus position is adjusted by operating the focus ring 219.

  When the MF prohibition mode is set, even if the user operates the focus ring 219, the focus lens 210c is not driven. When the MF prohibition mode is set, the user adjusts the focus position by automatic focus adjustment processing by the AF operation. In other words, the MF prohibition mode is a mode in which the focus mode is fixed at the AF mode.

When the M / A mode is set, a so-called live view display is performed on the display device 111. That is, a through image is displayed on the display screen of the display device 111. In the present embodiment, when the user operates the focus ring 219, the body control unit 103 cuts out a part of the through image displayed on the display device 111 and displays the enlarged through image to assist the manual adjustment of the focus position. It is configured as follows. This allows the user to make fine adjustments before and after the focus position. However, in the M / A mode, it is not always necessary to perform the enlarged display, and a one-time (actual magnification) display may be performed. Whether or not to enlarge the display in the M / A mode may be configured to allow the user to make a selection in a menu display, for example.
In the following description, a state in which the body control unit 103 performs the enlarged display is referred to as an enlarged display state. In addition, a state in which the enlarged display is not performed (a state of 1 × (1 ×)) is referred to as a normal display state.

  If the focus ring 219 is not operated for a certain period (for example, 10 seconds) while the body control unit 103 is in the enlarged display state, the body control unit 103 returns from the enlarged display state to the normal display state.

(Explanation of regular communication)
The body control unit 103 and the lens control unit 203 perform command data communication at predetermined intervals (for example, 16 milliseconds) during power-on. In the following description, the command data communication performed periodically is referred to as regular communication.

  In the steady communication, the body control unit 103 transmits information on various states of the camera body 100 to the lens control unit 203. In parallel with this, the lens control unit 203 transmits information on various states of the interchangeable lens 200 to the body control unit 103.

  The information transmitted from the body control unit 103 to the lens control unit 203 includes information indicating that the M / A mode is set in the camera body 100 and that the MF mode is set in the camera body 100 And information indicating that the MF prohibition mode is set in the camera body 100 (hereinafter, these may be collectively referred to as “mode information” or “mode signal”). That is, the body control unit 103 transmits information (mode information or mode signal) indicating an operation mode related to the focus adjustment of the camera body 100 to the lens control unit 203.

  The information transmitted from the body control unit 103 to the lens control unit 203 further includes information indicating that the camera body 100 is in a normal display state and information indicating that the camera body 100 is in an enlarged display state. included.

  The information transmitted from the lens control unit 203 to the body control unit 103 includes the movement amount and the movement direction of the focus ring 219 detected in a unit time (for example, the time from the last steady communication to the current steady communication). (Operation information) is included. The moving amount of the focus ring 219 is represented by, for example, the number of pulses of the detection signal output from the first photo interrupter 213a and the second photo interrupter 213b.

(Description of Manual Focus Control by Body Control Unit 103)
FIG. 10 is a flowchart of a control process executed by the body control unit 103 and the lens control unit 203. First, a control process executed by the body control unit 103 shown on the left side of the drawing will be described. The body control section 103 executes this control processing periodically.

  First, in step S10, the body control unit 103 transmits a mode signal to the lens control unit 203 by regular communication. In step S12, the body control unit 103 receives information (operation information) indicating the moving amount and the moving direction of the focus ring 219 from the lens control unit 203 by regular communication. In step S14, the body control unit 103 executes a state transition process described later.

  In step S16, the body control unit 103 determines whether the MF prohibition mode is set for the camera body 100. When the MF prohibition mode is set, the body control unit 103 ends the control processing illustrated in FIG. On the other hand, if the MF prohibition mode is not set, the body control unit 103 advances the process to step S18.

  In the processing of steps S18 to S28, the body control unit 103 generates a command (drive instruction) according to the operation information based on the above-described operation information received from the interchangeable lens in the normal communication. First, in step S18, the body control unit 103 determines whether the movement amount (operation information) received from the interchangeable lens is “0”. If the movement amount is “0”, the body control unit 103 advances the processing to step S24. In step S24, the body control unit 103 determines whether the automatic focus adjustment process is being performed. If the automatic focus adjustment process is not being executed, the body control unit 103 advances the process to step 26. In step S26, the body control unit 103 generates a focus lens stop command. In step S28, the body control unit 103 transmits a focus lens stop command to the lens control unit 203 by command data communication. On the other hand, when the automatic focus adjustment processing is being executed, the body control unit 103 does not generate and transmit the focus lens stop command, and ends the processing in FIG.

  On the other hand, when the received movement amount is not 0 in step S18, the body control unit 103 advances the processing to step S20. In step S20, the body control unit 103 generates a focus lens drive command according to the movement amount and the movement direction (the operation information described above) of the focus ring 219 received by the steady communication. In step S22, the body control unit 103 transmits the focus lens drive command generated in step S20 to the lens control unit 203 by command data communication. Therefore, the focus lens drive command includes, as a control parameter, information corresponding to the movement amount and the movement direction of the focus ring 219 received by the steady communication.

  Next, a control process performed by the lens control unit 203 illustrated on the right side of the paper will be described. First, in step S30, the lens control unit 203 receives a mode signal from the body control unit 103 through regular communication. In step S32, the lens control unit 203 transmits operation information to the body control unit 103 by regular communication. In step 34, the lens control unit 203 executes a state transition process described later. In step S36, the lens control unit 203 determines whether a focus lens drive command has been received from the body control unit 103. If a focus lens drive command has been received, the lens control unit 203 advances the process to step S40.

  In step S40, the lens control unit 203 drives the focus driving unit 214 to drive the focus lens 210c by a driving amount corresponding to the moving amount of the focus ring 219. The greater the amount of movement of the focus ring 219, the greater the amount of drive of the focus lens 210c.

  At this time, the lens control unit 203 changes the control method of the focus drive unit 214 according to the movement amount of the focus ring 219, which is the control parameter of the focus lens drive command received in step S36.

When the movement amount of the focus ring 219 is equal to or less than a predetermined threshold value (for example, three pulses), the focus lens 210c is driven by a drive amount proportional to the movement amount of the focus ring 219. On the other hand, when the movement amount of the focus ring 219 exceeds a predetermined threshold value (for example, three pulses), the focus lens 210c is driven at a drive speed calculated by the following equation (1).
v = ax ² + bx + c (1)

  Here, v is the drive speed of the focus lens 210c, x is the amount of movement of the focus ring 219, and a, b, and c are predetermined constants. That is, as the amount of movement of the focus ring 219 increases, the drive speed of the focus lens 210c increases quadratically.

  As described above, when the focus ring 219 is slightly moved, the lens control unit 203 performs control based on the drive amount, and drives the focus lens 210c at high speed and with good response. When the focus ring 219 is largely moved, control based on the drive speed is performed, and the focus lens 210c is largely driven at a drive speed that increases quadratically with respect to the amount of movement.

  If the focus lens drive command has not been received in step S36, the lens control unit 203 advances the processing to step S38. In step S38, the lens control unit 203 determines whether a focus lens stop command has been received from the body control unit 103. If a focus lens stop command has been received, the lens control unit 203 advances the process to step S42. In step S42, the lens control unit 203 causes the focus driving unit 214 to stop driving the focus lens 210c. When the focus lens 210c is not being driven, the lens control unit 203 does nothing.

(Description of operation state of interchangeable lens 200)
During operation, the interchangeable lens 200 takes one of four operation states, a pulse count state, an erroneous operation prevention state, a semi-light-off state, and a full light-off state.

  When the interchangeable lens 200 is in the pulse counting state, the lens control unit 203 determines the movement amount and the movement direction of the focus ring 219 based on the pulse-like detection signals output from the first photo-interrupter 213a and the second photo-interrupter 213b. To detect. When the interchangeable lens 200 is in the pulse counting state, the lens control unit 203 transmits information (operation information) indicating the detected moving amount and moving direction of the focus ring 219 to the camera body 100 through regular communication. At this time, the lens control unit 203 transmits the detected moving amount and moving direction of the focus ring 219 as they are.

  When the interchangeable lens 200 is in the erroneous operation prevention state, the lens control unit 203 detects the movement amount and the movement direction of the focus ring 219 (in other words, detects operation information) as in the pulse count state. . However, the movement amount transmitted by the steady communication is “0”. That is, the lens control unit 203 in the erroneous operation prevention state corrects the detected movement amount (operation information) of the focus ring 219 to “0”, and refers to the corrected operation information (hereinafter, referred to as “corrected operation information”). May be transmitted to the body control unit 103.

  When the interchangeable lens 200 is in the semi-extinguished state, the lens control unit 203 does not energize (cut off) any one of the first photo-interrupter 213a and the second photo-interrupter 213b. That is, the light emitting diodes 161a and 161b do not emit light, and no detection signal is output from the photointerrupter.

  Therefore, even if the focus ring 219 is operated in the semi-light-off state, only the detection signal from the other photo interrupter is input to the lens control unit 203, and the lens control unit 203 can detect the moving direction of the focus ring 219. Can not. Further, the detection accuracy of the movement amount of the focus ring 219 also decreases. However, since one of the photo interrupters does not consume power, the power consumption of the interchangeable lens 200 is reduced as compared with the pulse count state and the erroneous operation prevention state.

  When the interchangeable lens 200 is in the semi-extinguished state, the lens control unit 203 corrects the movement amount (operation information) transmitted by the steady communication to “0” as in the above-described erroneous operation prevention state, and corrects this. The corrected operation information (corrected operation information) is transmitted to the body control unit 103.

  When the interchangeable lens 200 is in the all-light-off state, the lens control unit 203 does not energize (cut off) both the first photo-interrupter 213a and the second photo-interrupter 213b. Therefore, even if the focus ring 219 is operated in the completely unlit state, no detection signal is input to the lens control unit 203, and the lens control unit 203 cannot detect the movement amount and the movement direction of the focus ring 219. However, the first photo-interrupter 213a and the second photo-interrupter 213b do not consume power, so that the power consumption of the interchangeable lens 200 is further reduced as compared with the case of the semi-light-off state.

  Next, the relationship between the operation states will be described.

  FIG. 11 is a flowchart of the state transition processing executed by the body control unit 103. In step S100, body control section 103 determines whether M / A mode is set for camera body 100 or not. If an operation mode other than the M / A mode is set, the body control unit 103 ends the processing in FIG. On the other hand, when the M / A mode is set, the body control unit 103 causes the process to proceed to step S110.

  In step S110, body control section 103 determines the current display state of camera body 100. If the display state is the normal display state, the body control unit 103 advances the process to step S120. In step S120, body control section 103 determines whether or not interchangeable lens 200 has transitioned to the pulse count state. As described below, when the M / A mode is set in the camera body 100, the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state when the focus ring 219 is operated. That is, in step S120, the body control unit 103 determines whether the focus ring 219 has been operated. If the focus ring 219 has been operated, the body control unit 103 causes the process to proceed to step S130. In step S130, body control section 103 causes camera body 100 to transition to the enlarged display state. On the other hand, if the focus ring 219 has not been operated, the body control unit 103 ends the processing in FIG.

  If the display state of the camera body 100 is the enlarged display state in step S110, the body control unit 103 advances the processing to step S140. In step S140, body control section 103 determines whether or not a predetermined AF operation has been performed by the user. If the AF operation has been performed, the body control unit 103 causes the process to proceed to step S160. On the other hand, if the AF operation has not been performed, the body control unit 103 advances the process to step S150.

  In step S150, body control section 103 determines whether or not focus ring 219 has been operated for a predetermined time or longer. If the focus ring 219 has been operated, the body control unit 103 ends the processing in FIG. On the other hand, if the focus ring 219 has not been operated for a predetermined time or more, the body control unit 103 advances the process to step S160. In step S160, body control section 103 causes camera body 100 to transition to the normal display state.

  As described above, in the case where the M / A mode is set in the camera body 100, when the lens control unit 203 causes the interchangeable lens 200 to transition from the erroneous operation prevention state to the pulse count state, the body control unit 103 enters the enlarged display state. Transitions to. In the enlarged display state, the body control unit 103 performs a predetermined AF operation by the user, or when the movement amount of the focus ring 219 transmitted from the lens control unit 203 by the steady communication remains at 0 for a certain period. Transitions from the enlarged display state to the normal display state. That is, when it is estimated that the user does not intend to continue manual focus adjustment any more, the body control unit 103 transitions from the enlarged display state to the normal display state.

  FIG. 12 is a flowchart of a state transition process performed by the lens control unit 203. First, in step S200, the lens control unit 203 determines an operation mode set for the camera body 100. If the MF prohibition mode is set for the camera body 100, the lens control unit 203 advances the processing to step S330.

  In step S330, the lens control unit 203 causes the interchangeable lens 200 to transition to the all-light-off state, and ends the processing in FIG. As described above, when the lens control unit 203 receives the information (mode signal) indicating that the MF prohibition mode is set to the camera body 100 from the body control unit 103 through the steady communication, the interchangeable lens 200 is turned off completely. Make a transition. This is because it is not necessary to detect the operation amount of the focus ring 219 in the MF prohibition mode.

  If the MF mode is set in the camera body 100 in step S200, the lens control unit 203 advances the processing to step S310. In step S310, the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state, and ends the processing in FIG. As described above, when the lens control unit 203 receives the information (mode signal) indicating that the MF mode is set to the camera body 100 from the body control unit 103 through the steady communication, the lens control unit 203 shifts the interchangeable lens 200 to the pulse count state. Let it.

  If the M / A mode is set in the camera body 100 in step S200, the lens control unit 203 advances the processing to step S210. In step S210, the lens control unit 203 determines whether or not the operation mode set for the camera body 100 has changed since the last time the processing in FIG. 12 was executed. If another operation mode was previously set, that is, if the M / A mode has been newly set, the lens control unit 203 advances the process to step S320. In step S320, the lens control unit 203 causes the interchangeable lens 200 to transition to the erroneous operation prevention state. As described above, when the lens control unit 203 receives the information (mode signal) indicating that the M / A mode is set in the camera body 100 from the body control unit 103 through the steady communication, the lens control unit 203 first prevents the interchangeable lens 200 from being erroneously operated. Transition to the state.

  If the operation mode has not changed from the previous time in step S210, the lens control unit 203 advances the processing to step S220. In step S220, the lens control unit 203 determines the current state of the interchangeable lens 200. If the interchangeable lens 200 is in the erroneous operation prevention state, the lens control unit 203 advances the processing to step S230.

  In step S230, the lens control unit 203 determines whether an edge corresponding to two pulses is detected within a predetermined time (for example, 200 milliseconds) in the detection signals of the first photo interrupter 213a and the second photo interrupter 213b. If two pulses of edges have been detected, the lens control unit 203 advances the process to step S260. In step S260, the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state. As described above, when the interchangeable lens 200 is in the erroneous operation prevention state, the lens control unit 203 detects two pulses in the detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b within a predetermined time (for example, 200 milliseconds). When an edge is detected, the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state. That is, when it is estimated that the user intends to perform manual focus adjustment, the lens control unit 203 causes the interchangeable lens 200 to transition from the erroneous operation prevention state to the pulse count state.

  This is because the automatic focus adjustment process is continued even if the focus ring 219 is unintentionally moved during the automatic focus adjustment process. In other words, this is to prevent the automatic focus adjustment processing from being interrupted by a slight touch of the finger or the like on the focus ring 219.

  If the edges for two pulses have not been detected in step S230, the lens control unit 203 advances the processing to step S240. In step S240, the lens control unit 203 determines whether a pulse has not been detected from the detection signals of the first photo-interrupter 213a and the second photo-interrupter 213b for a predetermined time (for example, 30 seconds) or more. If a pulse has not been detected, the lens control unit 203 advances the process to step S250. In step S250, the lens control unit 203 causes the interchangeable lens 200 to transition to a semi-extinguished state. On the other hand, if a pulse has been detected in step S240, the lens control unit 203 ends the processing in FIG. As described above, when the M / A mode is set in the camera body 100 and the interchangeable lens 200 is in the erroneous operation prevention state, the first photo-interrupter 213a and the second photo-interrupter 213b are not shorter than a predetermined time (for example, 30 seconds). When no pulse is detected from the detection signal, that is, when the focus ring 219 has not been operated for a predetermined time or more, the lens control unit 203 causes the interchangeable lens 200 to transition to a semi-extinguished state.

  If the interchangeable lens 200 is in the pulse count state in step S220, the lens control unit 203 advances the processing to step S290. In step S290, the lens control unit 203 determines whether a pulse has not been detected from the detection signals of the first photo interrupter 213a and the second photo interrupter 213b for a predetermined time (for example, 3 seconds) or more. If a pulse has not been detected, the lens control unit 203 advances the process to step S320. In step S320, the lens control unit 203 causes the interchangeable lens 200 to transition to the erroneous operation prevention state. On the other hand, if a pulse has been detected in step S290, the lens control unit 203 advances the processing to step S300. In step S300, the lens control unit 203 determines whether the camera body 100 has transitioned to the normal display state. If the camera body 100 has transitioned to the normal display state, the lens control unit 203 advances the process to step S320. In step S320, the lens control unit 203 causes the interchangeable lens 200 to transition to the erroneous operation prevention state. On the other hand, if the camera body 100 has not transitioned to the normal display state in step S300, the lens control unit 203 ends the processing in FIG.

  As described above, when the M / A mode is set in the camera body 100 and the interchangeable lens 200 is in the pulse counting state, the first photo-interrupter 213a and the second photo-interrupter 213b do not exceed a predetermined time (for example, 3 seconds). If no pulse is detected from the detection signal, that is, if the focus ring 219 has not been operated for a predetermined time or more, the lens control unit 203 causes the interchangeable lens 200 to transition to the erroneous operation prevention state. When the M / A mode is set for the camera body 100 and the interchangeable lens 200 is in the pulse count state, and the body control unit 103 transitions from the enlarged display state to the normal display state, the lens control unit 203 sets the interchangeable lens. 200 is shifted to the erroneous operation prevention state. That is, when it is estimated that the user does not intend to continue manual focus adjustment any more, the lens control unit 203 shifts the interchangeable lens 200 from the pulse count state to the erroneous operation prevention state.

  If the interchangeable lens 200 is in the semi-extinguished state in step S220, the lens control unit 203 advances the process to step S270. In step S270, the lens control unit 203 determines whether an edge of two pulses is detected within a predetermined time (for example, 200 milliseconds) in the detection signal of the first photo interrupter 213a or the second photo interrupter 213b. If the edges for two pulses have not been detected, the lens control unit 203 ends the processing in FIG. On the other hand, if two pulses of edges have been detected, the lens control unit 203 advances the process to step S280. In step S280, the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state. As described above, when the M / A mode is set in the camera body 100 and the interchangeable lens 200 is in the semi-extinguished state, the detection signal of the first photo-interrupter 213a or the second photo-interrupter 213b indicates a predetermined time (for example, 200 If an edge for two pulses is detected within (millisecond), the lens control unit 203 causes the interchangeable lens 200 to transition to the pulse count state. That is, when it is estimated that the user intends to perform manual focus adjustment, the lens control unit 203 causes the interchangeable lens 200 to transition from the semi-extinguished state to the pulse count state.

According to the camera system according to the first embodiment, the following operation and effect can be obtained.
(1) The lens-side first communication unit 217 (receiving means) receives information (mode signal) on the operation mode of the camera body 100 from the camera body 100. The lens control unit 203 (detection unit, correction unit) detects operation information indicating the movement amount and the movement direction of the focus ring 219 (moving member), and based on the information received by the lens-side first communication unit 217, The detected moving amount and moving direction of the focus ring 219 are corrected. With this configuration, it is possible to provide an easy-to-use interchangeable lens in which flexible control (control including limitation) according to the operation mode of the camera body is performed. In addition, since the mode information is also transmitted to the interchangeable lens side on the camera body side, appropriate information according to the operation mode (focus mode) of the camera regarding the operation information of the focus ring is received from the interchangeable lens side. Can be.

(2) The information on the operation mode of the camera body 100 indicates one of the MF mode (first mode) and the M / A mode (second mode) related to focus adjustment. With this configuration, the interchangeable lens 200 can perform control based on the operation mode related to the focus adjustment of the camera body 100.

(3) When information indicating the MF mode is received by the lens-side first communication unit 217, the lens control unit 203 does not correct the detected movement amount and movement direction of the focus ring 219, and When receiving the information indicating the MF mode, the communication unit 217 transmits the information indicating the moving amount and the moving direction of the focus ring 219 detected by the lens control unit 203. With this configuration, when the MF mode is set, it is presumed that the user intends the manual focus operation using the focus ring 219, and the operation of the focus ring 219 is transmitted to the camera body 100 as it is. The body control unit 103 can perform various controls in accordance with the operation amount of the focus ring 219.

(4) The lens control unit 203 determines that the information indicating the M / A mode is received by the first lens-side communication unit 217, and that the detected movement amount of the focus ring 219 per unit time is equal to or more than a predetermined amount. If there is, the detected moving amount and moving direction of the focus ring 219 are not corrected. The lens-side first communication unit 217 receives the information indicating the M / A mode, and determines that the movement amount of the focus ring 219 per unit time detected by the lens control unit 203 is equal to or more than a predetermined amount. In this case, information indicating the moving amount and moving direction of the focus ring 219 detected by the lens control unit 203 is transmitted. Thus, even when the M / A mode is set, when the focus ring 219 is moved by a certain size or more, the user intends to perform the manual focus operation using the focus ring 219. Therefore, the operation of the focus ring 219 is transmitted to the camera body 100 as it is, and the body control unit 103 can perform various controls in accordance with the operation amount of the focus ring 219.

(5) The lens control unit 203 determines that the information indicating the M / A mode has been received by the lens-side first communication unit 217, and that the detected movement amount of the focus ring 219 per unit time is less than the predetermined amount. If so, it is presumed that the user does not intend the manual focus operation using the focus ring 219 (just an erroneous operation), so the detected movement amount of the focus ring 219 is corrected to zero. In this way, even if the user inadvertently moves the focus ring 219 slightly in the M / A mode, the automatic focus adjustment processing is interrupted unexpectedly (contrary to the user's intention). There is no danger, and the usability of the user can be improved. That is, according to the present embodiment, in the case of a small operation on the focus ring in the M / A mode (an operation that can be regarded as an erroneous operation), a transition to the MF mode according to the erroneous operation (AF mode switching) (Interruption) can be limited, so that the AF mode is maintained, and the possibility of suddenly becoming unintentionally out of focus and missing a photo opportunity can also be reduced.

(6) The MF mode is a manual focus mode in which automatic focus adjustment is not performed. The M / A mode is an auto-manual combined mode in which both automatic focus adjustment and manual focus adjustment can be performed. With this configuration, fine adjustment of the focus lens 210c can be performed with good response in the MF mode, and erroneous operation of the focus lens 210c as described above can be suppressed in the M / A mode.

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

(Modification 1)
The present invention can be applied to a camera system different from that shown in FIG. For example, the present invention can be applied to a so-called single-lens reflex camera system including a quick return mirror.

(Modification 2)
In the embodiment described above, information (operation information) on the movement amount and the movement direction of the focus ring 219 detected on the interchangeable lens side is once transmitted to the camera body side, and the camera body side transmits a drive instruction according to the operation information. (Command) is generated, and then the generated command is transmitted from the camera body side to the interchangeable lens side to drive the focus lens 210c again. This may be configured so that the processing is completed in the interchangeable lens. That is, the lens control unit 203 may detect the movement amount and the movement direction of the focus ring 219, and then drive the focus lens 210c based on the movement amount and the movement direction.

  More specifically, when the lens control unit 203 receives a mode signal indicating the operation mode (focus mode as described in the above embodiment) of the camera from the camera body, the lens control unit 203 performs the above-described operation in accordance with the mode signal. Four operation states of a pulse count state, an erroneous operation prevention state, a semi-light-off state, and a full light-off state are selectively set. The processing of the operation information on the focus ring 219 (the operation information is used as it is or the operation information is corrected and used as corrected information) in the selected and set state is the same as in the above-described embodiment. The operation and effect in that case are the same. However, in the above embodiment, the processing for transmitting the operation information or the corrected operation information to the camera body is performed. However, in the present modification, the operation information or the corrected operation information is not transmitted to the camera body. Alternatively, the drive control of the focus lens is directly performed using the corrected operation information.

  If the processing is completed in the interchangeable lens as described above, the body control unit on the camera body side does not need to generate a command according to the operation information of the focus ring 219, so that the processing load on the body control unit is reduced. There are benefits that are reduced.

  As another configuration in which the processing is completed in the interchangeable lens, the following configuration can be realized. That is, if the lens control unit 203 determines that the operation of the focus ring 219 should be invalidated (set) according to the focus mode signal received from the camera body, even if the focus ring 219 Even when the operation information is detected by the above-described detection unit (the above-described photo interrupter), the lens control unit 203 does not receive the operation information, or treats the information as invalid even if it is received. Even with this configuration, the same advantages as described above can be obtained.

(Modification 3)
The interchangeable lens 200 of the embodiment described above may be configured as a so-called zoom lens having a variable focal length. In this case, the zoom operation is performed in the pulse count state, and the movement amount of the focus ring 219 transmitted by the steady communication is set to “0” for a fixed time (for example, 100 milliseconds) after the focal length changes. Is also good. By doing so, even when the focus ring 219 is unintentionally moved during the zoom operation, the focus lens 210c is not driven, and the usability of the interchangeable lens 200 is improved.

  Further, the lens control unit 203 that has received the focus lens drive command may change the drive amount and the drive speed of the focus lens 210c for each focal length. For example, the driving amount or the driving speed may be multiplied by a coefficient corresponding to the focal length, or the constants a, b, and c in the above equation (1) may be changed according to the focal length.

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

DESCRIPTION OF SYMBOLS 1 ... Camera system, 100 ... Camera body, 103 ... Body control part, 200 ... Interchangeable lens, 203 ... Lens control part, 210 ... Image forming optical system, 210c ... Focus lens, 213a ... First photo interrupter, 213b ... Second Photo interrupter, 219 ... Focus ring

Claims (5)

An interchangeable lens that can be attached to the camera body,
An optical system having a movable focus lens;
An operation member that moves by operation and outputs a movement amount,
A first mode in which the focus lens is moved by a drive amount instructed by the camera body, a second mode in which the focus lens is moved by a drive amount based on the movement amount of the operation member, and a command issued by the camera body. A third mode capable of switching between movement of the focus lens at a drive amount and movement of the focus lens at a drive amount based on the movement amount of the operation member, from the camera body. A control unit for controlling the focus lens by
A detection unit capable of detecting the amount of movement of the operation member,
The control unit includes:
When receiving the third mode from the camera body, if the movement amount of the operation member detected by the detection unit after the operation member is started is less than a predetermined amount, the operation member moves. Is transmitted to the camera body, and when the movement amount of the operation member is equal to or more than the predetermined amount, information indicating the movement amount of the operation member detected by the detection unit is transmitted to the camera body. Send,
An interchangeable lens that, when receiving the second mode from the camera body, transmits information indicating a movement amount of the operation member detected by the detection unit after the operation of the operation member is started to the camera body . The interchangeable lens according to claim 1,
The control unit, when receiving the third mode from the camera body, transmits a movement amount of the operation member detected by the detection unit to the camera body, a pulse count state, and consumes more than the pulse count state. A power saving state in which the power is small, and an erroneous operation prevention state in which information indicating that the operation member is not moving is transmitted to the camera body when the movement amount of the operation member detected by the detection unit is less than a predetermined amount. And an interchangeable lens to select one of them . The interchangeable lens according to claim 1 , wherein
The detection unit includes two detection units,
The control unit selects whether to energize the two detection units, to energize only one of the two detection units, or not to energize the two detection units. Interchangeable lenses that are possible . In the interchangeable lens according to any one of claims 1 to 3,
An interchangeable lens for transmitting the movement amount of the operation member to the camera body at the same cycle as periodically receiving a mode from the camera body . In the interchangeable lens according to any one of claims 1 to 4,
  An interchangeable lens that receives an instruction regarding driving of the focus lens from the camera body.

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