Imaging device

Abstract

To provide an imaging device capable of quickly and more accurately changing the focal length. 【Solution means】The imaging device includes an imaging element that captures a subject through an interchangeable lens including a zoom lens and generates image data, and a drive device attached to an operation ring that moves the zoom lens in the optical axis direction. A control unit that transmits a command indicating a drive direction and a drive amount, and the control unit transmits a command to drive the drive device, thereby obtaining calibration information indicating a correlation between the drive direction and drive amount of the drive device and the focal length of the interchangeable lens.

Description

Technical Field

[0001] The present disclosure relates to an imaging device.

Background Art

[0002] Conventionally, an imaging device is known that enables a remote zoom operation by connecting an external drive device to an operation ring provided on an interchangeable lens and rotating the operation ring using the drive device to move the zoom lens in the optical axis direction (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when performing a remote zoom operation, it is necessary to limit the driving speed of the drive device in order to prevent overrunning of the drive device, and there has been a case where it takes time to change the focal length. It can be said that there is room for improvement in changing the focal length of the interchangeable lens faster and more accurately.

[0005] An object of the present disclosure is to provide an imaging device capable of changing the focal length of an interchangeable lens faster and more accurately.

Means for Solving the Problems

[0006] The imaging device according to the present disclosure includes an imaging element that captures a subject through an interchangeable lens including a zoom lens and generates image data, and a control unit that transmits a command indicating a driving direction and a driving amount to a driving device attached to an operation ring that moves the zoom lens in the optical axis direction. The control unit obtains calibration information indicating a correlation between the driving direction and driving amount of the driving device and the focal length of the interchangeable lens by transmitting the command to drive the driving device.

[0007] The imaging device according to the present disclosure includes an imaging element that captures a subject through an interchangeable lens including a zoom lens and generates image data, a control unit that transmits a command indicating a driving direction and a driving amount to a driving device attached to an operation ring that moves the zoom lens in the optical axis direction, and a display unit. The control unit causes the display unit to display information related to a calibration operation for obtaining calibration information regarding driving of the driving device for each interchangeable lens.

Advantages of the Invention

[0008] According to the imaging device of the present disclosure, it is possible to change the focal length of the interchangeable lens quickly and more accurately.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9A

Figure 9B

Figure 10

Figure 11

Figure 12

Figure 13

Mode for Carrying Out the Invention

[0010] According to a first aspect of the present disclosure, there is provided an imaging device including an imaging element that captures a subject through an interchangeable lens including a zoom lens and generates image data, and a control unit that transmits a command indicating a driving direction and a driving amount to a driving device attached to an operation ring that moves the zoom lens in the optical axis direction. The control unit acquires calibration information indicating a correlation between the driving direction and driving amount of the driving device and the focal length of the interchangeable lens by transmitting the command to drive the driving device.

[0011] According to a second aspect of the present disclosure, the control unit acquires a current focal length indicating the current focal length of the interchangeable lens and a target focal length indicating a target focal length, and determines the driving amount of the driving device based on the target focal length, the current focal length, and the calibration information, and transmits the command including the determined driving amount to the driving device. The imaging device according to the first aspect is provided.

[0012] According to a third aspect of the present disclosure, when acquiring the calibration information, the control unit drives the driving device in a first driving direction to acquire first calibration information indicating a correlation between the driving amount in the first driving direction and the focal length of the interchangeable lens, and drives the driving device in a second driving direction to acquire second calibration information indicating a correlation between the driving amount in the second driving direction and the focal length of the interchangeable lens, and provides the imaging device according to the first aspect or the second aspect.

[0013] According to a fourth aspect of the present disclosure, the control unit acquires a current focal length indicating the current focal length of the interchangeable lens and a target focal length indicating a target focal length, and when the movement from the current focal length to the target focal length corresponds to the driving of the driving device in the first driving direction, determines the driving amount of the driving device based on the target focal length, the current focal length, and the first calibration information, and when the movement from the current focal length to the target focal length corresponds to the driving of the driving device in the second driving direction, determines the driving amount of the driving device based on the target focal length, the current focal length, and the second calibration information, and transmits the command including the determined driving amount to the driving device, and provides the imaging device according to the third aspect.

[0014] According to a fifth aspect of the present disclosure, when acquiring the calibration information, the control unit acquires the current focal length, which is the current focal length, from the interchangeable lens while driving the driving device, associates the acquired current focal length with the driving position of the corresponding driving device, and acquires the calibration information, and provides the imaging device according to any one of the first aspect to the fourth aspect.

[0015] According to a sixth aspect of the present disclosure, the control unit stores the calibration information together with the identification information of the interchangeable lens, and when the interchangeable lens is attached, determines whether the calibration information corresponding to the identification information of the interchangeable lens is already stored, and when the calibration information corresponding to the identification information of the interchangeable lens is already stored, the driving amount of the driving device can be determined based on the calibration information, and there is provided an imaging device according to any one of the first to fifth aspects.

[0016] According to a seventh aspect of the present disclosure, there is provided an imaging device including: an imaging element that captures a subject through an interchangeable lens including a zoom lens and generates image data; and a control unit that transmits a command indicating a driving direction and a driving amount to a driving device attached to an operation ring that moves the zoom lens in the optical axis direction, wherein the control unit causes a display unit to display information related to a calibration operation for acquiring calibration information regarding driving of the driving device for each interchangeable lens.

[0017] According to an eighth aspect of the present disclosure, there is provided an imaging device according to the seventh aspect, wherein the control unit causes the display unit to display, as information related to the calibration operation, information that enables selection of whether or not to execute the calibration operation.

[0018] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, a more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0019] Note that the applicant provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and does not intend to limit the subject matter described in the claims thereby.

[0020] (Embodiment) Hereinafter, the configuration of the remote imaging system according to this embodiment will be described with reference to the drawings.

[0021] FIG. 1 is a diagram showing the configuration of the remote imaging system according to this embodiment. As shown in FIG. 1, the imaging system 100 according to this embodiment includes a digital camera 2 and an external device (external communication device, control device) 40.

[0022] The external device 40 is an external control device that can communicate with the digital camera 2 and is used to remotely operate the digital camera 2.

[0023] The external device 40 can send instructions (remote operations) such as zoom operation, focus operation, aperture operation, and release button press of the digital camera 2 to the digital camera 2 via its own communication unit. The digital camera 2 receives the instructions from the external device 40 via its own communication unit 15 and performs operations according to the received instructions. The external device 40 includes an operation display unit 41 such as a liquid crystal screen, and operations by the user and displays to the user are performed via the operation display unit 41.

[0024] The digital camera 2 according to this embodiment includes a camera body 10 and an interchangeable lens 20 that can be attached to and detached from the camera body 10.

[0025] The camera body 10, which is an example of an imaging device, includes a camera control unit 11, an imaging element 12, a storage unit 13, an operation display unit 14, and a communication unit 15.

[0026] The camera control unit 11 controls the operation of the entire digital camera 2 by controlling components such as the imaging element 12 according to instructions from the external device 40 or the operation display unit 14.

[0027] The camera control unit 11 may be composed of a hard-wired electronic circuit or may be composed of a microcomputer using a program or the like. For example, the camera control unit 11 can be realized by a processor such as a CPU, MPU, GPU, DSP, FPGA, or ASIC.

[0028] The imaging element 12 is an element that images a subject image incident through the interchangeable lens 20 and generates image data. The imaging element 12 is, for example, a CMOS image sensor. The generated image data is digitized by an AD converter. The digitized image data is subjected to predetermined image processing by the camera control unit 11. The predetermined image processing is, for example, gamma correction processing, white balance correction processing, defect correction processing, YC conversion processing, electronic zoom processing, and JPEG compression processing. The imaging element 12 may be a CCD or an NMOS image sensor, etc.

[0029] The storage unit 13 is a storage unit that stores various information regarding the digital camera 2. The storage unit 13 includes, for example, a non-volatile memory and a volatile memory.

[0030] The operation display unit 14 is a member that functions as a display unit and an operation unit. The operation display unit 14 includes, for example, a display unit such as a liquid crystal monitor and an operation unit such as physical buttons. The display unit displays images such as through images and various information such as menu screens. The operation unit includes various operation members such as a release button, a mode dial, and a power switch.

[0031] The communication unit 15 is a wireless or wired communication interface. The camera control unit 11 can transmit various information to the external device 40 using PTP (Picture Transfer Protocol) through USB communication via the communication unit 15, for example.

[0032] The first connection unit 50 is a member for mechanically and electrically connecting the camera body 10 and the interchangeable lens 20. The first connection unit 50 of the present embodiment includes a body mount provided on the camera body 10 and a lens mount provided on the interchangeable lens 20. By connecting the body mount and the lens mount in the first connection unit 50, the camera control unit 11 and the lens control unit 21 can communicate with each other with the camera body 10 and the interchangeable lens 20 fixed to each other.

[0033] The interchangeable lens 20 connected to the camera body 10 includes a lens control unit 21, an optical system including a zoom lens 22, a zoom lens drive unit 23, a focal length detection unit 24, and a storage unit 25.

[0034] The lens control unit 21 controls the operation of the interchangeable lens 20 based on commands and the like transmitted from the camera control unit 11. The lens control unit 21 may be composed of a hard-wired electronic circuit or may be composed of a microcomputer using a program or the like. For example, the lens control unit 21 can be realized by a processor such as a CPU, MPU, GPU, DSP, FPGA, or ASIC.

[0035] The zoom lens 22 is a lens for changing the magnification of a subject formed by the optical system. The optical system includes a focus lens and a diaphragm in addition to the zoom lens 22. The zoom lens 22 is composed of one or a plurality of lenses. The zoom lens 22 is driven by the zoom lens drive unit 23.

[0036] The zoom lens drive unit 23 is a member for moving the zoom lens 22 along the optical axis direction of the optical system. By moving the zoom lens 22 along the optical axis direction, the focal length of the interchangeable lens 20 can be changed. The zoom lens drive unit 23 includes an operation ring 26 that can be manually operated by the user.

[0037] A gear 27 is provided on the outer peripheral portion of the operation ring 26. An external zoom drive device 30 can be connected to the gear 27. By connecting the external zoom drive device 30 to the interchangeable lens 20, the operation ring 26 can be remotely operated via the external zoom drive device 30 not only when the user manually operates the operation ring 26. As a result, a remote zoom operation can be executed.

[0038] The focal length detection unit 24 is a part that detects the focal length of the interchangeable lens 20. The focal length detection unit 24 is, for example, a zoom encoder. The information on the focal length detected by the focal length detection unit 24 is output to the lens control unit 21. The lens control unit 21 transmits the information on the current focal length of the interchangeable lens 20 acquired to the camera control unit 11 at a predetermined cycle (for example, about 60 Hz).

[0039] The storage unit 25 is a storage unit that stores various information regarding the interchangeable lens 20. The storage unit 25 includes, for example, a non-volatile memory and a volatile memory.

[0040] The storage unit 25 includes, for example, identification information of the interchangeable lens 20 and lens data such as the focal lengths at the Tele end and the Wide end. The lens data is transmitted from the lens control unit 21 to the camera control unit 11 when the camera body 10 and the interchangeable lens 20 are connected at the first connection unit 50. Thereby, the camera control unit 11 acquires the lens data regarding the interchangeable lens 20.

[0041] The external zoom drive device 30 is a device for remotely operating the operation ring 26, and includes a control unit 31, a drive motor 32, a reduction gear 33, a drive gear 34, and a rotational position detection unit 35.

[0042] The control unit 31 controls the operation of the external zoom drive device 30 based on commands and the like transmitted from the camera control unit 11. The control unit 31 may be configured by a hard-wired electronic circuit or may be configured by a microcomputer using a program or the like. For example, the control unit 31 can be realized by a processor such as a CPU, MPU, GPU, DSP, FPGA, or ASIC.

[0043] The drive motor 32 is a motor that rotates based on a drive signal transmitted from the control unit 31. The drive motor 32 rotates based on the drive direction and the drive amount specified by the drive signal. The rotational driving force of the drive motor 32 is transmitted to the drive gear 34 via the reduction gear 33.

[0044] The drive gear 34 is a gear that can engage with the gear 27 of the zoom lens drive unit 23, and transmits the rotational driving force of the drive motor 32 to the gear 27. By rotating the gear 27, the operation ring 26 can be rotated to move the zoom lens 22 in the optical axis direction.

[0045] The rotational position detection unit 35 is a part that detects the rotational position of the drive motor 32. The rotational position detection unit 35 is, for example, an encoder of the drive motor 32. The information on the rotational position of the drive motor 32 detected by the rotational position detection unit 35 is output to the control unit 31. The control unit 31 transmits the acquired rotational position information to the camera control unit 11 at a predetermined period (for example, about 60 Hz).

[0046] The second connection part 52 is a member for mechanically and electrically connecting the camera body 10 and the external zoom drive device 30. The second connection part 52 of the present embodiment includes a body mount provided on the camera body 10 and a drive device mount provided on the external zoom drive device 30. By connecting the body mount and the drive device mount in the second connection part 52 while engaging the drive gear 34 with the gear 27, the camera control unit 11 and the control unit 31 can communicate with each other with the camera body 10 and the external zoom drive device 30 fixed to each other.

[0047] In the imaging system 100 having the above configuration, when the user inputs a target focal length to the external device 40, the information on the target focal length is transmitted from the external device 40 to the camera control unit 11, and the camera control unit 11 operates the external zoom drive device 30 so that the focal length of the interchangeable lens 20 becomes the target focal length. Thereby, a remote zoom operation is executed.

[0048] The camera control unit 11 of this embodiment previously acquires calibration information indicating the correlation between the focal length of the interchangeable lens 20 and the drive direction / drive amount of the drive motor 32 of the external zoom drive device 30. When the camera control unit 11 has calibration information regarding the interchangeable lens 20, it can execute a remote zoom operation using the calibration information. As a result, the focal length of the interchangeable lens 20 can be changed to the target focal length quickly and more accurately.

[0049] FIG. 2 and FIG. 3 show a first drive table (FIG. 2) and a second drive table (FIG. 3) as an example of calibration information. In FIGS. 2 and 3, the focal length (unit: mm) of the interchangeable lens 20 is shown in the left column, and the rotational position (unit: pulse) of the drive motor 32 corresponding to the focal length is shown in the right column.

[0050] The first drive table (Table No. 1-1) shown in FIG. 2 is calibration information when driving the zoom lens 22 in the Tele direction. The second drive table (Table No. 1-2) shown in FIG. 3 is calibration information when driving the zoom lens 22 in the Wide direction.

[0051] In the first drive table shown in FIG. 2 and the second drive table shown in FIG. 3, for the same focal length, the corresponding rotational positions do not completely match (especially when the focal length is 30 mm or more and 95 mm or less). This mismatch is because there is hysteresis in the change of the focal length when the drive motor 32 moves in the Tele direction and when it moves in the Wide direction.

[0052] When the movement of the zoom lens 22 from the current focal length to the target focal length is in the Tele direction, the camera control unit 11 drives the external zoom drive device 30 using the first drive table shown in FIG. 2. When the movement of the zoom lens 22 from the current focal length to the target focal length is in the Wide direction, the camera control unit 11 drives the external zoom drive device 30 using the second drive table shown in FIG. 3.

[0053] By selectively using two drive tables according to the moving direction of the zoom lens 22 from the current focal length toward the target focal length in this way, it is possible to change more accurately from the current focal length to the target focal length.

[0054] The information on the two drive tables shown in FIGS. 2 and 3 is stored in the storage unit 13 of the camera body 10 together with the identification information of the interchangeable lens 20.

[0055] FIG. 4 is a table showing the identification information of the interchangeable lens 20 stored in the storage unit 13 of the camera body 10 and the No. of the corresponding drive table.

[0056] In FIG. 4, the "Drive Table No" in the left column indicates the No. of the drive table, and the "Lens ID" in the right column indicates the identification information of the interchangeable lens 20. In the example shown in FIG. 4, the identification information (1001, 1008, 1004) of three interchangeable lenses 20 and the corresponding three table Nos. (1, 2, 3) are stored.

[0057] For one drive table No, there are two types of drive tables. For example, corresponding to Table No = 1, the first drive table (for Tele direction drive) of Table No. 1-1 shown in FIG. 2 and the second drive table (for Wide direction drive) of Table No. 1-2 shown in FIG. 3 are stored in the storage unit 13.

[0058] The operation of the imaging system 100 having the above configuration will be described with reference to the drawings from FIG. 5 onward.

[0059] FIG. 5 is a flowchart showing the operation executed by the camera control unit 11 of the camera body 10 when the interchangeable lens 20 is attached to the camera body 10.

[0060] The flow shown in FIG. 5 is executed by the camera control unit 11 in response to the camera body 10 and the interchangeable lens 20 being fixed to each other at the first connection unit 50 shown in FIG. 1 and the camera control unit 11 and the lens control unit 21 being electrically communicable.

[0061] The camera control unit 11 acquires lens data (S11). Specifically, the camera control unit 11 acquires lens data regarding the interchangeable lens 20 from the lens control unit 21. The lens data includes information such as identification information of the interchangeable lens 20.

[0062] The camera control unit 11 determines whether there is a drive table corresponding to the lens ID (S12). Specifically, the camera control unit 11 reads out the information of the lens ID / drive table No. (FIG. 4) stored in the storage unit 13, and determines whether there is a drive table No. corresponding to the lens ID acquired in step S11. In the example shown in FIG. 4, when the identification information (lens ID) of the interchangeable lens 20 acquired in step S11 is any one of "1001", "1008", and "1004", it is determined that there is a drive table corresponding to the lens ID (YES in S12), and when it is not any of "1001", "1008", and "1004", it is determined that there is no drive table corresponding to the lens ID (NO in S12).

[0063] When it is determined that there is a drive table corresponding to the lens ID (Yes in S12), the camera control unit 11 sets the drive table (S13). Specifically, the camera control unit 11 reads out the information of the drive table (calibration information) stored in association with the drive table No. corresponding to the identification information (lens ID) of the interchangeable lens 20 acquired in step S11 from the storage unit 13 to make it available for use.

[0064] When it is determined that there is no drive table corresponding to the lens ID (No in S12), or in response to the execution of step S13, the camera control unit 11 ends the flow shown in FIG. 5.

[0065] FIGS. 6 and 7 are flowcharts showing a calibration operation for creating the first drive table and the second drive table (calibration information) shown in FIGS. 2 and 3.

[0066] The flow shown in FIGS. 6 and 7 is executed by the camera control unit 11 in response to the user selecting to execute a calibration operation for remote zoom operation via the operation display unit 41 of the external device 40.

[0067] As shown in FIG. 6, the camera control unit 11 transmits a drive command in the Wide direction (S21). Specifically, the camera control unit 11 transmits a drive command for rotationally driving the drive motor 32 in the drive direction corresponding to the movement of the zoom lens 22 in the Wide direction to the control unit 31 of the external zoom drive device 30. The control unit 31 that has received the drive command controls the drive motor 32 to rotate in the drive direction specified by the drive command. Thereby, the zoom lens 22 starts to move in the Wide direction.

[0068] The camera control unit 11 determines whether or not it has reached the Wide end (S22). Specifically, the camera control unit 11 determines whether or not the zoom lens 22 has reached the Wide end based on the information on the current focal length of the interchangeable lens 20 transmitted from the lens control unit 21 of the interchangeable lens 20. The information on the focal length corresponding to the Wide end is included in the lens data and is acquired in step S11 of FIG. 5.

[0069] In response to determining that it has reached the Wide end (Yes in S22), the camera control unit 11 transmits a command to stop the drive motor 32 of the external zoom drive device 30 (S23). Specifically, the camera control unit 11 transmits a command for stopping the rotational drive of the drive motor 32 to the control unit 31 of the external zoom drive device 30. The control unit 31 controls the drive motor 32 to stop its rotational drive in response to receiving the command.

[0070] By steps S21 to S23, the zoom lens 22 is moved to the Wide end and stopped.

[0071] The camera control unit 11 transmits a command to reset the detection pulse of the rotational position to 0 (S24). Specifically, the camera control unit 11 transmits a command to the control unit 31 of the external zoom drive device 30 to reset the pulse information indicating the rotational position output from the rotational position detection unit 35 to 0. Thereby, the rotational position of the drive motor 32 corresponding to the Wide end of the zoom lens 22 is set as the reference position.

[0072] The camera control unit 11 transmits a Tele-direction drive command (S25). Specifically, the camera control unit 11 transmits a drive command to the control unit 31 of the external zoom drive device 30 to rotationally drive the drive motor 32 in the drive direction (for example, the first drive direction) corresponding to the movement of the zoom lens 22 in the Tele direction. The control unit 31 that has received the drive command controls the drive motor 32 to rotationally drive it in the drive direction specified by the drive command. Thereby, the zoom lens 22 starts to move in the Tele direction.

[0073] The camera control unit 11 determines whether or not the focal length has changed (S26). Specifically, the camera control unit 11 determines whether or not the focal length has changed according to whether or not the current focal length is different from the most recent focal length based on the information on the current focal length transmitted from the lens control unit 21 of the interchangeable lens 20.

[0074] When it is determined that the focal length has changed (Yes in S26), the camera control unit 11 acquires the rotational position (S27). Specifically, the camera control unit 11 acquires the rotational position of the drive motor 32 by the control unit 31 of the external zoom drive device 30 transmitting the information on the rotational position output from the rotational position detection unit 35 to the camera control unit 11.

[0075] The camera control unit 11 stores the focal length and the rotational position (S28). Specifically, the camera control unit 11 associates the information on the current focal length acquired in step S26 with the information on the rotational position of the drive motor 32 acquired in step S27, and stores them in the storage unit 13. The information on the focal length and the rotational position stored in step S28 constitutes the information of the first drive table for Tele-direction driving shown in FIG. 2.

[0076] The camera control unit 11 determines whether or not it has reached the Tele end (S29). Specifically, if the current focal length acquired in step S26 is the focal length corresponding to the Tele end, the camera control unit 11 determines that it has reached the Tele end (Yes in S29), and proceeds to step S30. If the current focal length acquired in step S26 is not the focal length corresponding to the Tele end, the camera control unit 11 determines that it has not reached the Tele end (No in S29), and executes step S26 again.

[0077] Steps S26 to S29 are repeatedly executed until the current focal length acquired in step S26 becomes the focal length corresponding to the Tele end. In other words, while moving the zoom lens 22 from the Wide end toward the Tele end (S25), every time the focal length of the interchangeable lens 20 changes (Yes in S26), the current focal length and the corresponding rotational position of the drive motor 32 are stored in the storage unit 13 (S28), and the first drive table for Tele-direction driving shown in FIG. 2 is created.

[0078] When it is determined that the Tele end has been reached (Yes in S29), the camera control unit 11 transmits a command to stop the drive motor 32 (S30). Specifically, the camera control unit 11 transmits a command for stopping the rotational drive of the drive motor 32 to the control unit 31 of the external zoom drive device 30. The control unit 31 controls to stop the rotational drive of the drive motor 32 in response to the reception of the command.

[0079] By executing steps S21 to S30, the first drive table for Tele direction driving shown in FIG. 2 is created. The created first drive table shows the correlation between each focal length from the Wide end to the Tele end and the rotational position of the drive motor 32 corresponding to each focal length.

[0080] In the example shown in FIG. 2, the focal length corresponding to the Wide end is 28 mm, the rotational position of the drive motor 32 is 0 pulse, the focal length corresponding to the Tele end is 105 mm, and the rotational position of the drive motor 32 is 780 pulses. The focal lengths and rotational positions memorized in step S28 are not limited to being used as the first drive table, and only a part of the memorized information may be used as the first drive table.

[0081] As shown in FIG. 7, the camera control unit 11 transmits a drive command in the Wide direction (S31). Specifically, the camera control unit 11 transmits a drive command for rotationally driving the drive motor 32 in the drive direction (for example, the second drive direction) corresponding to the movement of the zoom lens 22 in the Wide direction to the control unit 31 of the external zoom drive device 30. The control unit 31 that has received the drive command controls the drive motor 32 to rotationally drive it in the drive direction specified by the drive command. As a result, the zoom lens 22 starts to move in the Wide direction from the position corresponding to the Tele end toward the position corresponding to the Wide end.

[0082] The camera control unit 11 determines whether the focal length has changed (S32). Specifically, the camera control unit 11 determines whether the focal length has changed according to whether the current focal length is different from the most recent focal length based on the information on the current focal length transmitted from the lens control unit 21 of the interchangeable lens 20.

[0083] When it is determined that the focal length has changed (Yes in S32), the camera control unit 11 acquires the rotational position (S33). Specifically, the control unit 31 of the external zoom drive device 30 transmits the rotational position information output from the rotational position detection unit 35 to the camera control unit 11, so that the camera control unit 11 acquires the rotational position of the drive motor 32.

[0084] The camera control unit 11 stores the focal length and the rotational position in the memory (S34). Specifically, the camera control unit 11 associates the information on the current focal length acquired in step S32 with the information on the rotational position of the drive motor 32 acquired in step S33 and stores them in the storage unit 13. The information on the focal length and the rotational position stored in step S34 creates the second drive table for Wide direction driving shown in FIG. 3.

[0085] The camera control unit 11 determines whether it has reached the Wide end (S35). Specifically, if the current focal length acquired in step S32 is the focal length corresponding to the Wide end, the camera control unit 11 determines that it has reached the Wide end (Yes in S35) and proceeds to step S36. If the current focal length acquired in step S32 is not the focal length corresponding to the Wide end, the camera control unit 11 determines that it has not reached the Wide end (No in S35) and executes step S32 again.

[0086] Steps S32 to S35 are repeatedly executed until the current focal length acquired in step S32 becomes the focal length corresponding to the Wide end. In other words, while moving the zoom lens 22 from the Tele end towards the Wide end (S31), every time the focal length of the interchangeable lens 20 changes (Yes in S32), the current focal length and the corresponding rotational position of the drive motor 32 are stored in the storage unit 13 (S34), and the second drive table for Wide direction driving shown in FIG. 3 is created.

[0087] When it is determined that the Wide end has been reached (Yes in S35), the camera control unit 11 transmits a command to stop the drive motor 32 (S36). Specifically, the camera control unit 11 transmits a command to stop the rotational drive of the drive motor 32 to the control unit 31 of the external zoom drive device 30. In response to the reception of the command, the control unit 31 controls to stop the rotational drive of the drive motor 32.

[0088] By executing steps S31 to S36, the second drive table for Wide direction drive shown in FIG. 3 is created. The created second drive table shows the correlation between each focal length from the Tele end to the Wide end and the rotational position of the drive motor 32 corresponding to each focal length.

[0089] In the example shown in FIG. 3, the focal length corresponding to the Tele end is 105 mm, the rotational position of the drive motor 32 is 780 pulse, the focal length corresponding to the Wide end is 28 mm, and the rotational position of the drive motor 32 is 0 pulse. The focal lengths and rotational positions memorized in step S34 are not limited to being used as the second drive table, and only a part of the memorized information may be used as the second drive table.

[0090] When the first drive table and the second drive table are created, the camera control unit 11 determines whether there is a drive table corresponding to the lens ID (S37). Specifically, the camera control unit 11 reads out the information of the lens ID / drive table No (FIG. 4) stored in the storage unit 13, and determines whether there is a drive table corresponding to the lens ID according to whether there is data corresponding to the identification information (lens ID) of the interchangeable lens 20 acquired in step S11.

[0091] If it is determined that there is no drive table corresponding to the lens ID (No in S37), the camera control unit 11 adds a drive table (S38). Specifically, the camera control unit 11 adds the first drive table and the second drive table created by executing steps S21 to S36, together with the identification information of the interchangeable lens 20, as the lens ID / drive table No information shown in FIG. 4. As a result, the first drive table and the second drive table created by executing steps S21 to S36 are added as calibration information for remote zoom operation of the interchangeable lens 20.

[0092] If it is determined that there is a drive table corresponding to the lens ID (Yes in S37), the camera control unit 11 replaces the drive table (S39). Specifically, the camera control unit 11 replaces the first drive table and the second drive table created by executing steps S21 to S36 with the lens ID and the drive table No of the interchangeable lens 20 that already exist in the lens ID / drive table No information shown in FIG. 4, and stores them in the storage unit 13. As a result, the drive table corresponding to the interchangeable lens 20 is replaced and updated.

[0093] FIG. 8 is a flowchart showing a method of performing a remote zoom operation using the drive table created / updated by the calibration operation shown in FIGS. 6 and 7.

[0094] The flow shown in FIG. 8 is executed by the camera control unit 11 when the user inputs a target focal length via the external device 40 in a state where the drive table corresponding to the attached interchangeable lens 20 (lens ID) is stored in the storage unit 13 of the camera body 10.

[0095] As shown in FIG. 8, the camera control unit 11 determines whether the target focal length > the current focal length (S41). Specifically, the camera control unit 11 determines whether the target focal length > the current focal length based on the target focal length transmitted from the external device 40 and the current focal length transmitted from the interchangeable lens 20.

[0096] When it is determined that the target focal length > the current focal length (Yes in S41), the camera control unit 11 calculates the driving amount from the first driving table (S42). Specifically, when the target focal length > the current focal length, it is necessary to move the zoom lens 22 in the Tele direction. Therefore, the camera control unit 11 calculates the driving amount of the driving motor 32 from the first driving table for Tele direction driving.

[0097] FIG. 9A is a diagram showing a method of calculating the driving amount of the driving motor 32 from the first driving table for Tele direction driving.

[0098] In the example shown in FIG. 9A, the current focal length is 40 mm and the target focal length is 90 mm. The rotational position corresponding to a focal length of 40 mm is 130 pulses, and the rotational position corresponding to a focal length of 90 mm is 630 pulses. The camera control unit 11 calculates the driving amount of the driving motor 32 as 630 pulses - 130 pulses = 500 pulses.

[0099] In response to the calculation of the driving amount, the camera control unit 11 transmits a driving command for specifying the driving amount in the Tele direction (S43). Specifically, the camera control unit 11 transmits a driving command to the control unit 31 of the external zoom driving device 30, specifying the driving direction (for example, the first driving direction) of the driving motor 32 corresponding to the Tele direction and the driving amount (for example, 500 pulses) calculated in step S42.

[0100] The control unit 31 that has received the driving command controls the driving motor 32 to operate in the driving direction and with the driving amount specified by the driving command. By rotating the driving motor 32 in the specified driving direction with the specified driving amount, the operation ring 26 rotates via the driving gear 34 and the gear 27, and the zoom lens 22 is moved in the Tele direction.

[0101] Since the driving amount is determined based on the pre-acquired calibration information, the target focal length, and the current focal length, when moving the zoom lens 22, it is possible to accurately move from the position corresponding to the current focal length to the position corresponding to the target focal length. Different from the conventional method, even if the driving speed of the driving motor 32 is increased, there is little possibility of overrun, and it is possible to change to the target focal length quickly and more accurately.

[0102] When it is determined that the target focal length > the current focal length is not satisfied (No in S41), the camera control unit 11 calculates the driving amount from the second driving table (S44). Specifically, when the target focal length > the current focal length is not satisfied, it is necessary to move the zoom lens 22 in the Wide direction. Therefore, the camera control unit 11 calculates the driving amount of the driving motor 32 from the second driving table for Wide direction driving.

[0103] FIG. 9B is a diagram showing a method of calculating the driving amount of the driving motor 32 from the second driving table for Wide direction driving.

[0104] In the example shown in FIG. 9B, the current focal length is 90 mm and the target focal length is 40 mm. The rotational position corresponding to the focal length of 90 mm is 620 pulses, and the rotational position corresponding to the focal length of 40 mm is 120 pulses. The camera control unit 11 calculates the driving amount of the driving motor 32 as 120 pulses - 620 pulses = -500 pulses.

[0105] After calculating the driving amount, the camera control unit 11 transmits a driving command specifying the driving amount in the Wide direction (S45). Specifically, the camera control unit 11 transmits a driving command specifying the driving direction of the driving motor 32 corresponding to the Wide direction (for example, the second driving direction) and the driving amount (for example, -500 pulses) calculated in step S44 to the control unit 31 of the external zoom driving device 30.

[0106] Upon receiving the drive command, the control unit 31 controls the drive motor 32 to operate in the drive direction and drive amount specified by the drive command. As the drive motor 32 rotates in the specified drive direction by the specified drive amount, the operation ring 26 rotates via the drive gear 34 and the gear 27, moving the zoom lens 22 in the Wide direction.

[0107] Since the drive amount is determined based on the pre-acquired calibration information, the target focal length, and the current focal length, unlike the conventional method, even if the drive speed of the drive motor 32 is increased, there is little possibility of overrun occurring, and it is possible to change to the target focal length quickly and more accurately.

[0108] As shown in FIGS. 9A and 9B, when moving in the Tele direction and when moving in the Wide direction, even at the same focal length, the rotational positions of the corresponding drive motor 32 are different from each other.

[0109] For example, when driving in the Tele direction using the first drive table, if the previous drive direction was the same Tele direction, as described with reference to FIG. 9A, the drive amount may be obtained by the simple difference between the rotational position corresponding to the target focal length and the rotational position corresponding to the current focal length. On the other hand, if the previous drive direction was the Wide direction and the drive direction is reversed, the rotational position corresponding to 40 mm of the current focal length is not 130 pulses shown in FIG. 9A but 120 pulses shown in FIG. 9B. Therefore, the drive amount is calculated as 630 pulses - 120 pulses = 510 pulses. The difference of 10 pulses between 510 pulses and 500 pulses corresponds to the backlash amount when the drive motor 32 reverses.

[0110] Similarly, when driving in the Wide direction using the second drive table, if the previous driving direction is the same Wide direction, the driving amount can be obtained by the simple difference between the rotational position corresponding to the target focal length and the rotational position corresponding to the current focal length, as described with reference to FIG. 9B. On the other hand, if the previous driving direction is the Tele direction and the driving direction is reversed, the rotational position corresponding to 90 mm of the current focal length is not 620 pulses shown in FIG. 9B but 630 pulses shown in FIG. 9A. Therefore, the driving amount is calculated as 120 pulses - 630 pulses = -510 pulses. The difference between 500 pulses and 510 pulses, which is -10 pulses, corresponds to the backlash amount when the drive motor 32 reverses.

[0111] As described above, when the driving direction is reversed, by adding the backlash amount (10 pulses, -10 pulses) to calculate the driving amount, it becomes possible to change more accurately to the target focal length.

[0112] In response to the execution of steps S43 and S45, the camera control unit 11 determines whether the drive motor 32 has stopped (S46). Specifically, the camera control unit 11 determines that the drive motor 32 has stopped (Yes in S46) when the information on the rotational position of the drive motor 32 transmitted from the control unit 31 is the same as the information obtained previously, and proceeds to step S47. When the information on the rotational position of the drive motor 32 transmitted from the control unit 31 is different from the information obtained previously, the camera control unit 11 determines that the drive motor 32 has not stopped (No in S46) and executes step S46 again.

[0113] Thereby, the drive motor 32 is driven until the driving of the drive motor 32 by the driving amount specified in steps S43 and S45 is completed, and when the driving is completed, the process proceeds to step S47.

[0114] The camera control unit 11 determines whether the target focal length ≠ the current focal length (S47). Specifically, the camera control unit 11 acquires information on the current focal length from the interchangeable lens 20, and determines whether the target focal length ≠ the current focal length by comparing the acquired current focal length with the target focal length input from the external device 40.

[0115] When it is determined that the target focal length ≠ the current focal length (Yes in S47), the camera control unit 11 performs a warning display (S48). Specifically, when the target focal length ≠ the current focal length, it is considered that an abnormality has occurred, such as a state where the external zoom drive device 30 is not properly attached (i.e., out of adjustment state). Therefore, a warning indicating that an abnormality has occurred is displayed on the operation display unit 14 of the camera body 10 or the operation display unit 41 of the external device 40. In the warning display, for example, the user may be prompted to check the attachment state of the external zoom drive device 30 and retry. This can prompt the user to return to a normal state.

[0116] When it is determined that the target focal length ≠ the current focal length is not true (No in S47), the camera control unit 11 ends the flow shown in FIG. 8 without performing a warning display. When the target focal length ≠ the current focal length is not true, it is confirmed that the target focal length and the current focal length match accurately, and the target focal length of the interchangeable lens 20 can be accurately changed.

[0117] According to the above-described flow, the camera control unit 11 acquires calibration information (drive table) indicating the correlation between the drive direction and drive amount of the drive motor 32 and the focal length of the interchangeable lens 20, and determines the drive amount of the drive motor 32 based on the acquired calibration information. In this way, by acquiring the calibration information in advance, when actually driving the external zoom drive device 30 to change the focal length, it is possible to change the focal length quickly and more accurately.

[0118] Once the calibration information is obtained, it is stored in the storage unit 13 even after the interchangeable lens 20 is removed. When the same interchangeable lens 20 is reinstalled on the camera body 10, as shown in FIG. 5, if it is determined that there is a drive table corresponding to the lens ID of the interchangeable lens 20 (Yes in S12), the drive table is set to a usable state (S13). Unless a calibration operation is performed again on the interchangeable lens 20 to update the drive table (Yes in S37, S39), it is possible to reuse the already obtained calibration information without updating it.

[0119] Next, a display example regarding the remote zoom operation of the interchangeable lens 20 will be described with reference to the drawings after FIG. 10.

[0120] FIG. 10 shows a display example regarding the remote zoom operation displayed on the operation display unit 41 of the external device 40. In the example shown in FIG. 10, items such as "Zoom speed", "Zoom (focal length specified)", "Zoom (current focal length)", and "Calibration" are displayed.

[0121] The user can operate the input / selectable portions of each item shown in FIG. 10. The input / selected content is transmitted from the external device 40 to the camera body 10.

[0122] "Zoom speed" is an item for the user to specify the moving speed of the zoom lens 22 (corresponding to the driving speed of the driving motor 32). In the example shown in FIG. 10, "15" is input.

[0123] "Zoom (focal length specified)" is an item for the user to specify the target focal length. In the example shown in FIG. 10, "70" mm is input.

[0124] "Zoom (current focal length)" is an item indicating the current focal length of the interchangeable lens 20. In the example shown in FIG. 10, it is shown that the current focal length is 148 mm.

[0125] Under the item of "Zoom (Current Focal Length)", as items visually indicating the current focal length, "W 45", "175 T", and the display bar 60 are displayed. "W 45" indicates that the focal length at the Wide end is 45 mm, "175 T" indicates that the focal length at the Tele end is 175 mm, and the display bar 60 indicates that the current focal length is 148 mm.

[0126] "Calibration" is an item for the user to select the start of the above-described calibration operation. When the user selects "Start", the camera control unit 11 of the camera body 10 executes a series of calibration operations (S21 to 39) shown in FIGS. 6 and 7, thereby creating a drive table corresponding to the interchangeable lens 20. The created drive table is stored in the storage unit 13 as calibration information together with the identification information of the interchangeable lens 20. Unless the user selects "Start", the camera control unit 11 does not execute the calibration operation.

[0127] In the present embodiment, depending on whether or not the user selects "Start" of "Calibration", it is possible to select whether or not to execute the calibration operation for the remote zoom operation.

[0128] When the calibration information is not created without executing the calibration operation, the remote zoom operation can be performed by the same method as in the conventional case without using the calibration information. Specifically, while restricting the driving speed of the drive motor 32, the drive motor 32 is moved from the current focal length toward the target focal length, and each time it is determined whether or not the target focal length has been reached based on the information on the current focal length transmitted from the interchangeable lens 20. When it is determined that the target focal length has been reached, the driving of the drive motor 32 is stopped.

[0129] By enabling the user to select whether to perform the calibration operation, it becomes possible to execute a remote zoom operation according to the user's preference. Also, when the calibration information of the interchangeable lens 20 is already stored, the calibration information can be reused to execute the remote zoom operation.

[0130] Figs. 11 to 13 show display examples related to the remote zoom operation displayed on the operation display unit 14 of the camera body 10.

[0131] Fig. 11 is the initial menu screen, and items such as "Q MENU", "Video Button", "Zoom Drive Setting", "Focus Ring Setting", and "Touch Setting" are displayed. When the user selects the item 70 of "Zoom Drive Setting", the screen shown in Fig. 12 is shifted to.

[0132] Fig. 12 is a menu screen related to the remote zoom operation using the external zoom drive device 30, and items such as "Focal Length Display ON", "Step Zoom", "Zoom Position Memory", "Zoom Speed", and "Zoom Calibration" are displayed. When the user selects the item 72 of "Zoom Calibration", the screen shown in Fig. 13 is shifted to.

[0133] Fig. 13 is a screen for selecting whether to perform the calibration operation. In the example shown in Fig. 13, characters "Do you want to execute calibration?" and characters "YES" and "NO" are displayed. When the user selects "YES", the camera control unit 11 executes the series of calibration operations shown in Figs. 6 and 7, and a drive table (calibration information) corresponding to the interchangeable lens 20 is created. When the user selects "NO", the camera control unit 11 does not execute the calibration operation.

[0134] Similar to the example shown in FIG. 10, by enabling the user to select whether to perform the calibration operation, a remote zoom operation according to the user's preference can be executed. Further, when the calibration information of the interchangeable lens 20 is already stored, the calibration information can be reused to execute the remote zoom operation.

[0135] As described with reference to FIGS. 10 to 13, by displaying information related to the calibration operation for acquiring the calibration information for each interchangeable lens 20 on the operation display unit 14 or the operation display unit 41, it becomes possible to acquire the calibration information in advance, leading to changing the focal length faster and more accurately.

[0136] (Function and Effect) As described above, the digital camera 2 (imaging device) of the present embodiment includes an imaging element 12 that captures a subject through an interchangeable lens 20 including a zoom lens 22 and generates image data, and an external zoom drive device 30 (drive device) attached to an operation ring 26 that moves the zoom lens 22 in the optical axis direction. A camera control unit 11 (control unit) that transmits a command indicating the drive direction and drive amount, and the camera control unit 11 transmits the command to drive the external zoom drive device 30 (S25, S31), and the drive direction and drive amount of the external zoom drive device 30 and the interchangeable lens 20. Calibration information indicating the correlation with the focal length is acquired (S28, S34).

[0137] According to such a configuration, by acquiring the calibration information in advance, when driving the external zoom drive device 30 to change the focal length, it becomes possible to change the focal length faster and more accurately.

[0138] Also, in the digital camera 2 (imaging device) of the present embodiment, the camera control unit 11 (control unit) acquires the current focal length indicating the current focal length of the interchangeable lens 20 and the target focal length indicating the target focal length, and based on the target focal length, the current focal length, and the calibration information, determines the driving amount of the external zoom driving device 30, and transmits a command including the determined driving amount to the external zoom driving device 30 (S41 to S45). According to such a configuration, when changing from the current focal length to the target focal length, it is possible to change the focal length quickly and more accurately.

[0139] Also, in the digital camera 2 (imaging device) of the present embodiment, when the camera control unit 11 (control unit) acquires the calibration information, it drives the external zoom driving device 30 in the first driving direction (S25), and acquires the first calibration information indicating the correlation between the driving amount in the first driving direction and the focal length of the interchangeable lens 20 (S28). Then, it drives the external zoom driving device 30 in the second driving direction (S31), and acquires the second calibration information indicating the correlation between the driving amount in the second driving direction and the focal length of the interchangeable lens 20 (S34). According to such a configuration, it is possible to acquire a more accurate driving amount according to the driving direction of the external zoom driving device 30, and the accuracy when changing the focal length can be improved.

[0140] Also, in the digital camera 2 (imaging device) of the present embodiment, the camera control unit 11 (control unit) acquires the current focal length indicating the current focal length of the interchangeable lens 20 and the target focal length indicating the target focal length. When the movement from the current focal length to the target focal length corresponds to the driving in the first driving direction of the external zoom driving device 30, the driving amount of the external zoom driving device 30 is determined based on the target focal length, the current focal length, and the first calibration information (S41, S42). When the movement from the current focal length to the target focal length corresponds to the driving in the second driving direction of the external zoom driving device 30, the driving amount of the external zoom driving device 30 is determined based on the target focal length, the current focal length, and the second calibration information (S41, S44), and a command including the determined driving amount is transmitted to the external zoom driving device 30 (S43, S45). According to such a configuration, it is possible to obtain a more accurate driving amount according to the driving direction of the external zoom driving device 30, and the accuracy when changing the focal length can be improved.

[0141] Also, in the digital camera 2 (imaging device) of the present embodiment, when the camera control unit 11 (control unit) acquires the calibration information, it acquires the current focal length which is the current focal length from the interchangeable lens 20 while driving the external zoom driving device 30 (S25, S26, S31, S32), associates the acquired current focal length with the driving position of the corresponding external zoom driving device 30, and acquires it as calibration information (S28, S34). According to such a configuration, the calibration information can be acquired by a simple method.

[0142] Also, in the digital camera 2 (imaging device) of the present embodiment, the camera control unit 11 (control unit) stores calibration information together with the identification information of the interchangeable lens 20 (S38, S39). When the interchangeable lens 20 is attached, it determines whether calibration information corresponding to the identification information of the interchangeable lens 20 has already been stored (S12). If the calibration information corresponding to the identification information of the interchangeable lens 20 has already been stored (YES in S12), based on the calibration information, the driving amount of the external zoom drive device 30 can be determined. According to such a configuration, when the calibration information of the newly attached interchangeable lens 20 is already available, by being able to determine the driving amount of the external zoom drive device 30 based on the calibration information, it becomes possible to change the focal length quickly and more accurately without acquiring calibration information again.

[0143] As described above, the digital camera 2 (imaging device) of the present embodiment includes an imaging element 12 that captures a subject through an interchangeable lens 20 including a zoom lens 22 and generates image data, and a camera control unit 11 (control unit) that transmits a command indicating a driving direction and a driving amount to an external zoom drive device 30 (driving device) attached to an operation ring 26 that moves the zoom lens 22 in the optical axis direction. The camera control unit 11 causes the operation display unit 14 or the operation display unit 41 (display unit) to display information related to a calibration operation for acquiring calibration information regarding the driving of the external zoom drive device 30 for each interchangeable lens 20.

[0144] According to such a configuration, by displaying information related to the calibration operation, it becomes possible to acquire calibration information in advance, leading to being able to change the focal length quickly and more accurately.

[0145] In addition, in the digital camera 2 (imaging device) of the present embodiment, the camera control unit 11 causes the operation display unit 14 or the operation display unit 41 (display unit) to display information regarding the necessity of executing the calibration operation as information related to the calibration operation. According to such a configuration, by enabling the user to select whether or not to execute the calibration operation, the method of changing the focal length can be selected according to the user's preference. If calibration information is already available, it is also possible to execute a remote zoom operation by reusing the calibration information.

[0146] (Other embodiments) The present disclosure is not limited to the above-described embodiments, and various embodiments are conceivable.

[0147] In the above-described embodiment, the case where the user executes a remote zoom operation via the external device 40 has been described, but it is not limited to such a case. For example, even when the user executes a remote zoom operation via the camera body 10 without using the external device 40, the remote zoom operation and the calibration operation can be executed through the display examples shown in FIGS. 11 to 13.

[0148] Therefore, among the components described in the accompanying drawings and the detailed description, there may be included not only the components essential for solving the problem, but also the components not essential for solving the problem for the purpose of exemplifying the above technology. Therefore, just because those non-essential components are described in the accompanying drawings and the detailed description, it should not be immediately determined that those non-essential components are essential.

[0149] In addition, since the above-described embodiments are for exemplifying the technology in the present disclosure, various changes, replacements, additions, omissions, etc. can be made within the scope of the claims or their equivalents.

[0150] The present disclosure is applicable to imaging devices such as digital cameras.

Description of reference numerals

[0151] 2 Digital camera (imaging device) 10 Camera body 20 Interchangeable lens 30 External zoom drive device 40 External device 100 Imaging system

Claims

1. An imaging device that captures a subject through an interchangeable lens including a zoom lens and generates image data; A control unit that transmits a command indicating a driving direction and a driving amount to a driving device attached to an operation ring that moves the zoom lens in the optical axis direction. The imaging device is provided with: The control unit: By transmitting the command to drive the driving device, calibration information indicating a correlation between the driving direction and driving amount of the driving device and the focal length of the interchangeable lens is acquired; The current focal length indicating the current focal length of the interchangeable lens and the target focal length indicating the target focal length are acquired; Based on the target focal length, the current focal length, and the calibration information, the driving amount of the driving device is determined; The command including the determined driving amount is transmitted to the driving device. An imaging device.

2. When acquiring the calibration information, the control unit: Drives the driving device in a first driving direction to acquire first calibration information indicating a correlation between the driving amount in the first driving direction and the focal length of the interchangeable lens; Drives the driving device in a second driving direction to acquire second calibration information indicating a correlation between the driving amount in the second driving direction and the focal length of the interchangeable lens. The imaging device according to Claim 1.

3. The control unit: Acquires the current focal length indicating the current focal length of the interchangeable lens and the target focal length indicating the target focal length; When the movement from the current focal length to the target focal length corresponds to the driving of the driving device in the first driving direction, based on the target focal length, the current focal length, and the first calibration information, the driving amount of the driving device is determined; When the movement from the current focal length to the target focal length corresponds to the driving of the driving device in the second driving direction, based on the target focal length, the current focal length, and the second calibration information, the driving amount of the driving device is determined; The command including the determined driving amount is transmitted to the driving device. The imaging device according to Claim 2.

4. When acquiring the calibration information, the control unit: The imaging device according to claim 1, wherein while driving the driving device, a current focal length which is the current focal length is acquired from the interchangeable lens, and the acquired current focal length is associated with a driving position of the corresponding driving device and acquired as the calibration information.

5. The control unit stores the calibration information together with the identification information of the interchangeable lens, when the interchangeable lens is attached, determines whether calibration information corresponding to the identification information of the interchangeable lens has already been stored, and when the calibration information corresponding to the identification information of the interchangeable lens has already been stored, enables determination of a driving amount of the driving device based on the calibration information. The imaging device according to claim 1.

Images