JP2020034760A - Interchangeable lens unit and imaging apparatus - Google Patents

Abstract

To provide an interchangeable lens unit capable of reducing fluctuation of exposure regardless of the operating speed for changing an aperture position.SOLUTION: An interchangeable lens unit 100 includes: an aperture unit 114 with a variable aperture position; a user-operable operation member 133; and lens control means 111 that controls the drive of the aperture unit. The lens control means is configured to calculate a target aperture position according to the operation amount of the operating member for each control cycle of the aperture unit. The aperture unit calculates the drive speed of the aperture unit so that the target aperture position for each control cycle is reached in a longer time than the control cycle.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an interchangeable lens device (hereinafter, referred to as an interchangeable lens) connectable to an imaging device (hereinafter, referred to as a camera body), and particularly to an interchangeable lens that controls an aperture.

  The interchangeable lens receives an aperture drive command from the camera body in which a user sets an aperture position (aperture value or F value), and controls the aperture according to the instruction. In this case, for example, when the user continuously performs the operation of changing the aperture position while capturing a moving image, an aperture drive command is transmitted from the camera body to the interchangeable lens each time, and driving and stopping of the aperture in the interchangeable lens are performed. To be repeated. As a result, there is a possibility that flicker may occur without the exposure changing smoothly.

  Patent Literature 1 discloses a camera that suppresses flickering of exposure by reducing the drive speed of an aperture when displaying a moving image in an electronic viewfinder.

JP-A-03-010576

  However, in the camera disclosed in Patent Literature 1, the operation speed for changing the aperture position is not considered, and the speed of changing the exposure may be too slow with respect to the operation speed.

  The present invention provides an interchangeable lens and an image pickup apparatus capable of reducing the flicker of exposure regardless of the operation speed for changing the aperture position.

  An interchangeable lens device according to one aspect of the present invention includes an aperture unit having a variable aperture position, an operation member operable by a user, and lens control means for controlling driving of the aperture unit. The lens control means calculates a target aperture position and a drive speed of the aperture unit according to the operation amount of the operation member for each control cycle of the aperture unit. The drive speed is a speed at which the aperture unit reaches a target aperture position for each control cycle in a longer time than the control cycle.

  Note that an imaging apparatus having a camera control unit for transmitting a control cycle of the aperture unit to the interchangeable lens apparatus also constitutes another aspect of the present invention.

  Further, an imaging apparatus according to another aspect of the present invention is mounted on an interchangeable lens device having an aperture unit having a variable aperture position and an operation member operable by a user. The imaging device has an imaging element that captures a subject image formed by light passing through the aperture unit, and camera control means. The camera control means calculates a target aperture position and a drive speed of the aperture unit according to the operation amount of the operation member for each control cycle of the aperture unit. The drive speed is a speed at which the aperture unit reaches a target aperture position for each control cycle in a longer time than the control cycle.

  Note that an interchangeable lens device having a lens control unit that transmits an operation amount of the operation member to the imaging device also constitutes another aspect of the present invention.

  Further, a control method as another aspect of the present invention is applied to an interchangeable lens device including an aperture unit having a variable aperture position and an operation member operable by a user. The control method includes a step of calculating a target aperture position corresponding to an operation amount of the operation member for each control cycle of the aperture unit, and a step of calculating a drive speed of the aperture unit for each control cycle. The drive speed is such that the aperture unit reaches the target aperture position in each control cycle in a longer time than the control cycle.

  Furthermore, a control method according to another aspect of the present invention is applied to an imaging apparatus equipped with an interchangeable lens device having an aperture unit having a variable aperture position and an operation member that can be operated by a user. The control method includes a step of calculating a target aperture position corresponding to an operation amount of the operation member for each control cycle of the aperture unit, and a step of calculating a drive speed of the aperture unit for each control cycle. The drive speed is such that the aperture unit reaches the target aperture position in each control cycle in a longer time than the control cycle.

  Note that a computer program that causes the interchangeable lens device or the imaging device to execute a process according to the control method also constitutes another aspect of the present invention.

  According to the present invention, it is possible to reduce the flicker of exposure regardless of the operation speed of the operation member for changing the aperture position.

FIG. 1 is a block diagram illustrating a configuration of an interchangeable lens and a camera body that are Embodiment 1 of the present invention. 5 is a flowchart illustrating aperture operation information determination processing according to the first embodiment. 5 is a flowchart illustrating an aperture drive speed calculation process according to the first embodiment. FIG. 4 is a diagram illustrating an aperture drive speed in the first embodiment. 7 is a flowchart illustrating operation information communication processing according to the first embodiment. 9 is a flowchart illustrating an aperture drive speed calculation process according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration of a camera system including a lens unit (interchangeable lens device) 100 according to a first embodiment of the present invention and a camera body (imaging device) 200 to which the lens unit 100 is detachably and communicablely mounted. Is shown.

  The lens unit 100 has an imaging optical system. The imaging optical system includes a field lens 101, a variable power lens 102, an aperture unit 114, an afocal lens 103, and a focus lens 104 in order from the subject side (left side in the figure). The variable power lens 102 and the focus lens 104 perform variable power and focus adjustment of the imaging optical system by moving in the optical axis direction (the direction of the arrow in the figure). The aperture unit 114 has a variable aperture opening diameter (in other words, an aperture position) for adjusting the amount of light passing through the imaging optical system. The aperture position can be rephrased as an aperture value and an F value.

  The variable power lens 102 and the focus lens 104 are held by lens holding frames 105 and 106, respectively. The lens holding frames 105 and 106 are held by a guide shaft (not shown) so as to be movable in the optical axis direction, and are driven in the optical direction by receiving driving forces from stepping motors 107 and 108. In the diaphragm unit 114, the diaphragm blades 114a and 114b are driven in the opening and closing directions by the driving force from the diaphragm actuator 113 to change the diaphragm opening diameter (that is, the diaphragm position). In the following description, driving of the aperture blades 114a and 114b is referred to as driving of the aperture unit 114.

  The lens unit 100 has a lens microcomputer (hereinafter, referred to as a lens microcomputer) 111 as lens control means. The lens microcomputer 111 includes a focus lens 104 (stepping motor 108) and a variable power lens 102 (stepping) according to a user operation of a focus operation ring 130 and a zoom switch (not shown) as operation members provided on the lens unit 100. The driving of the motor 107) is controlled. The stepping motors 107 and 108 are driven by a zoom drive circuit 119 and a focus drive circuit 120, respectively, which receive a zoom control signal and a focus control signal from the lens microcomputer 111.

  Further, the lens microcomputer 111 also performs control according to various lens control commands transmitted from the camera body 200 (a camera microcomputer 205 described later).

  In the aperture unit 114, the positions of the aperture blades 114a and 114b in the opening and closing direction are detected by the photo interrupter 115, and information on the positions is input to the lens microcomputer 111. The lens microcomputer 111 outputs an aperture control signal to the aperture drive circuit 121 based on the position information. The aperture drive circuit 121 drives the aperture actuator 113 according to the aperture control signal.

  The focus operation ring 130 is an operation member that performs a manual focus (MF) operation for the user to input an instruction to move the focus lens 104 to an arbitrary position. The rotation direction and the rotation amount of the focus operation ring 130 are detected by the focus ring rotation detection unit 131. The focus ring rotation detection unit 131 includes a photo interrupter and a slit light blocking plate that rotates between the light emitting unit and the light receiving unit of the photo interrupter according to the rotation of the focus operation ring 130. The photo interrupter outputs a pulse signal by alternately arranging the slit-shaped light transmitting portions and the light shielding portion of the slit light shielding plate between the light emitting portion and the light receiving portion. The pulse signal is input to the lens microcomputer 111. The lens microcomputer 111 detects the amount of rotation of the focus operation ring 130 by counting the pulse signals.

  The focus ring rotation detector 131 is configured by combining two photo interrupters and one slit light shielding plate arranged at a predetermined interval from each other. The lens microcomputer 111 can determine the rotation direction of the focus operation ring 130 by identifying which of the output pulse waveforms from the two photo interrupters is leading.

  Furthermore, detecting (calculating) the rotation speed of the focus operation ring 130 by measuring the time from the edge where the level of the output signal of one photointerrupter switches to the edge of the output signal of the other photointerrupter. Can be. However, when the two photointerrupters are not arranged at the interval as designed, the dimensional error appears as a time error between the edge portions, so that an accurate rotation speed cannot be detected. For this reason, since there is no such a problem between the edge portions of the output signal of one photointerrupter, in this embodiment, the lens microcomputer 111 determines the rotation speed of the focus operation ring 130 using the time interval at which these edge portions appear. Is detected.

  The lens microcomputer 111 controls the focus drive circuit 120 according to MF operation information (rotation direction, rotation amount, and rotation speed) detected through the focus ring rotation detection unit 131 and a focus drive command transmitted from a camera microcomputer 205 described later. The drive of the focus lens 104 (stepping motor 108) is controlled via the control unit.

  In this embodiment, the focus ring rotation detecting unit 131 is configured using a photo interrupter, but may be configured using a capacitance sensor, a magnetic sensor, or the like.

  The lens unit 100 is provided with an aperture operation ring 133 so as to be rotatable. The aperture operation ring 133 is an operation member capable of an endless rotation operation for performing an aperture operation for inputting an instruction to set an aperture unit 114 to an arbitrary aperture position by a user. The rotation direction (operation direction) and the rotation amount (operation amount) of the aperture operation ring 133 are determined by using a pulse signal output from an aperture ring rotation detection unit 132 configured similarly to the focus ring rotation detection unit 131 using the lens microcomputer 111. Is detected by The aperture ring rotation detection unit 132 and the lens microcomputer 111 constitute detection means (rotation detection means) for detecting the operation amount of the aperture operation ring 133. The lens microcomputer 111 controls the aperture operation information detected through the aperture ring rotation detection unit 132 (in accordance with the rotation direction and the amount of rotation of the aperture operation ring 133 and the aperture drive command transmitted from the camera microcomputer 205 described later). The drive of the aperture unit 114 (the aperture actuator 113) is controlled via the.

  The “operation amount” will be described. The operation amount of the operation ring is the rotation angle and the number of clicks of the operation ring. In addition, the operation amount of the zoom switch means the time during which the lever is tilted from the neutral position to the wide angle side or the telephoto side for the swing lever type zoom switch, and if there are switches on the wide angle side and the telephoto side, respectively. The time during which the switch was pressed. Further, for an operation member including a scale and a movable member movable with respect to the scale, the position of the movable member is referred to.

  The camera body 200 includes an image sensor 201 configured by a CCD sensor, a CMOS sensor, or the like that captures (photoelectrically converts) a subject image formed by the lens unit 100. Further, the camera body 200 includes an A / D conversion circuit 202, a signal processing circuit 203, a recording unit 204, a camera microcomputer (camera microcomputer) 205 as a camera control unit, and a display unit 206.

  The imaging element 201 photoelectrically converts a subject image and outputs an electric signal (analog signal). This analog signal is converted into a digital signal by the A / D conversion circuit 202, and the digital signal is input to the signal processing circuit 203. The signal processing circuit 203 performs various kinds of signal processing on the input digital signal to generate a focus signal indicating a focus state of the imaging optical system (subject image) or a luminance signal indicating an exposure state. Or generate a video signal. The video signal generated by the signal processing circuit 203 is sent to the recording unit 204, and still image data and moving image data obtained from the video signal are recorded in the recording unit 204. Also, a moving image corresponding to the video signal is displayed on the display unit 206 as a live view image. The user can check the imaging composition and the focus state by viewing the live view image.

  The camera body 200 and the lens unit 100 are mechanically and electrically connected by a mount 300 as a coupling mechanism. The lens unit 100 receives power supply from the camera body 200 via a power terminal provided on the mount 300. The camera microcomputer 205 and the lens microcomputer 111 communicate with each other via a communication terminal provided on the mount 300.

  The camera microcomputer 205 controls the camera body 200 according to inputs from an imaging instruction switch, a camera setting switch, and the like (not shown) provided on the camera body 200. Further, the camera microcomputer 205 transmits a zoom drive command, an aperture drive command, and a focus drive command to the lens microcomputer 111, and transmits information for focus control and aperture control to the focus operation ring 130 and the aperture operation ring 133. Or send.

  Next, a process of controlling the aperture unit 114 according to a user operation of the aperture operation ring 133 will be described. The flowchart in FIG. 2 illustrates a process for determining the aperture operation information, and the flowchart in FIG. 3 illustrates a process for calculating the drive speed of the aperture unit 114 (hereinafter, referred to as the aperture drive speed). These processes are executed by the lens microcomputer 111 according to a computer program.

  In step S101 of FIG. 2, the lens microcomputer 111 determines whether or not a user operation (rotation operation) of the aperture operation ring 133 has been performed based on whether or not a pulse signal has been input from the aperture ring rotation detection unit 132. If there is no user operation, the lens microcomputer 111 repeats the determination in step S101 until a user operation is detected. If there is a user operation, the process proceeds to step S102.

  In step S <b> 102, the lens microcomputer 111 determines which of the output pulse waveforms from the two photo interrupters of the aperture ring detector 132 is leading, and determines the rotation direction of the aperture operation ring 133, as described above. If the rotation direction of the aperture operation ring 133 is the normal rotation direction, the lens microcomputer 111 proceeds to step S103, and increments the rotation amount of the aperture operation ring 133. Then, the process proceeds to step S105. On the other hand, if the rotation direction of the aperture operation ring 133 is the reverse direction, the lens microcomputer 111 proceeds to step S104, and decrements the rotation amount of the aperture operation ring 133. Then, the process proceeds to step S105.

  In step S105, the lens microcomputer 111 determines whether the rotation amount is positive or negative. If the rotation amount is positive, the process proceeds to S106, and if the rotation amount is negative, the process proceeds to S107.

  In step S106, the lens microcomputer 111 determines the rotation direction of the aperture operation ring 133 as the aperture operation information to be the normal rotation direction. On the other hand, in step S107, the lens microcomputer 111 determines the rotation direction of the aperture operation ring 133 to be the reverse rotation direction.

  The lens microcomputer 111 sequentially updates the aperture operation information indicating the rotation direction and the rotation amount of the aperture operation ring 133 when the user operates the aperture operation ring 133 by the above processing.

  In step S201 of FIG. 3, the lens microcomputer 111 acquires information on the aperture resolution from the camera microcomputer 205. The aperture resolution is set from a camera setting menu by a user operation, and the drive amount of the aperture unit 114 per unit rotation amount (unit operation amount: one click) of the aperture operation ring 133, that is, the drive resolution (（step, 1 / step). 3 stages, 1/8 stage, etc.).

  Next, in step S202, the lens microcomputer 111 acquires information on the aperture control cycle from the camera microcomputer 205. The aperture control cycle is an aperture control cycle for transmitting an aperture drive command from the camera microcomputer 205 to the lens microcomputer 111. The camera microcomputer 205 transmits an aperture drive command to the lens microcomputer 111 in the aperture control cycle.

  Next, in step S203, the lens microcomputer 111 determines whether a transmission request for aperture operation information has been received from the camera microcomputer 205. The lens microcomputer 111 repeats the determination in step S203 if there is no transmission request, and proceeds to step S204 if there is a transmission request.

  In steps S204 and S205, the lens microcomputer 111 transmits the rotation direction and the rotation amount of the aperture operation ring 133 determined by the aperture operation information determination processing of FIG.

  Next, in step S206, the lens microcomputer 111 calculates (sets) an aperture drive speed. The method of calculating the aperture drive speed will be described later.

  Next, in step S207, the lens microcomputer 111 transmits the aperture drive speed calculated in step S206 to the camera microcomputer 205. The camera microcomputer 205 determines the driving direction (opening or closing direction), driving amount, and aperture of the aperture unit 114 according to the rotation direction and the amount of rotation of the aperture operation ring 133 received in steps S204 and S205 and the received aperture driving speed. An aperture drive command including a drive speed is generated. In the following description, the drive direction and the drive amount of the aperture unit 114 are referred to as the aperture drive direction and the aperture drive amount, respectively.

  Next, in step S208, the lens microcomputer 111 determines whether or not an aperture drive command has been received from the camera microcomputer 205. If no lens drive command has been received, the lens microcomputer 111 repeats the determination in step S208 until the lens microcomputer 111 receives the command. On the other hand, if an aperture drive command has been received, the flow advances to step S209 to drive the aperture unit 114 according to the aperture drive direction, aperture drive amount, and aperture drive speed included in the aperture drive command.

  Next, a method of calculating the aperture drive speed in step S206 will be described with reference to FIG. The “aperture control cycle” in the figure is information acquired by the lens microcomputer 111 from the camera microcomputer 205 in step S202. As described above, an aperture drive command is transmitted from the camera microcomputer 205 to the lens microcomputer 111 in this aperture control cycle. You. “Aperture position” (1, 2) indicates the position of the aperture blades 114a and 114b while the aperture unit 114 is being driven. The “target aperture position” in the figure is an aperture position calculated at the timing when the lens microcomputer 111 receives a transmission request for aperture operation information from the camera microcomputer 205 in step S203 (that is, for each aperture control cycle). is there. Specifically, the lens microcomputer 111 multiplies the aperture resolution acquired from the camera microcomputer 205 in step S201 by the rotation amount in the aperture control cycle of the aperture operation ring 133 determined by the aperture operation information determination processing in FIG. Calculate the target aperture position. At this time, the target aperture position is an aperture position in a direction corresponding to the rotation direction of the aperture operation ring 133 determined by the aperture operation information determination process. Note that the target aperture position may be rephrased as a target drive amount of the aperture unit 114 (target aperture drive amount).

  If the drive of the aperture unit 114 to the target aperture position has been completed by the timing of receiving the next aperture drive command from the camera microcomputer 205 as indicated by the broken line as the aperture position 1 in the drawing, the aperture unit 114 is driven. , Stop and drive are repeated. As a result, the flicker of the exposure is conspicuous for the user. Therefore, in the present embodiment, as shown by the solid line as the aperture position 2 in the drawing, the aperture unit 114 reaches the target aperture position for each aperture control cycle in a longer time (T 'or T ") than the control cycle. The aperture driving speed is calculated to drive the aperture unit 114. Thus, only the target aperture position can be changed without stopping the aperture unit 114 at the reception timing of the next aperture driving command. As a result, the aperture unit 114 can be driven smoothly, and the exposure can be changed smoothly (without flicker).

For this purpose, it is necessary to determine the aperture driving speed so that the driving of the aperture unit 114 is not completed at the reception timing of the next aperture driving command. The lens microcomputer 111 calculates the aperture drive speed V using the following equation (1) or (2) using the target aperture position Target, the current aperture position NowPosi, the aperture control cycle T, and the correction variable α. The correction coefficient α is for setting the denominator (time) of the equation to a value larger than T.
V = (Target-NowPosi) / (T + α) (1)
V = (Target-NowPosi) / (T × α) (2)
Note that the above-described method of calculating the aperture drive speed is merely an example, and another calculation method may be used.

  In the present embodiment, when the aperture unit 114 is driven according to a user operation of the aperture operation ring 113, a target aperture position is set for each aperture control cycle, and the drive of the aperture unit 114 is not stopped at the target aperture position. Is set to the aperture driving speed. Thus, regardless of the operation speed of the aperture operation ring 113, it is possible to suppress flickering of the exposure while the aperture unit 114 is being driven.

  Next, a second embodiment of the present invention will be described. In the first embodiment, the case where the lens microcomputer 111 calculates the aperture drive speed has been described. In the second embodiment, the camera microcomputer 205 calculates the aperture drive speed.

  The flowchart in FIG. 5 illustrates the aperture operation information transmission processing performed by the lens microcomputer 111 in the present embodiment.

  In step S301, the lens microcomputer 111 determines whether a transmission request for aperture operation information has been received from the camera microcomputer 205. The lens microcomputer 111 repeats the determination in step S301 if there is no transmission request, and proceeds to step S302 if there is a transmission request.

  In steps S302 and S303, the lens microcomputer 111 transmits the rotation direction and the rotation amount of the aperture operation ring 133 as aperture operation information determined by the aperture operation information determination processing of FIG.

  The flowchart in FIG. 6 illustrates the aperture drive speed calculation processing performed by the camera microcomputer 205 in the present embodiment.

  In steps S401 and S402, the camera microcomputer 205 acquires the rotation direction and the rotation amount of the aperture operation ring 133 transmitted from the lens microcomputer 111.

  Next, in step S403, the camera microcomputer 205 uses the aperture resolution information set by itself and the rotation direction and rotation amount of the aperture operation ring 133 received from the lens microcomputer 111 as described in the first embodiment, and The drive direction is set, and the aperture drive amount is calculated.

  Next, in step S404, the camera microcomputer 205 determines that the driving of the aperture unit 114 to the target aperture position does not end by the time the next aperture driving command is transmitted to the lens microcomputer 111 as described in the first embodiment. Is calculated.

  In step S405, the camera microcomputer 205 transmits an aperture driving command including the aperture driving direction, the aperture driving amount, and the aperture driving speed to the lens microcomputer 111. Accordingly, the lens microcomputer 111 drives the aperture unit 114 at the aperture drive speed by the aperture drive amount in the aperture drive direction included in the aperture drive command.

Also in the present embodiment, when the aperture unit 114 is driven according to a user operation of the aperture operation ring 113, a target aperture position is set for each aperture control cycle, and the drive of the aperture unit 114 is not stopped at the target aperture position. Is set to the aperture driving speed. Thus, regardless of the operation speed of the aperture operation ring 113, it is possible to suppress flickering of the exposure while the aperture unit 114 is being driven.
(Other Examples)
The present invention supplies a program for realizing one or more functions of the above-described embodiments to a system or an apparatus via a network or a storage medium, and one or more processors in a computer of the system or the apparatus read and execute the program. This processing can be realized. Further, it can also be realized by a circuit (for example, an ASIC) that realizes one or more functions.

  Each of the embodiments described above is only a typical example, and various modifications and changes can be made to each embodiment when the present invention is implemented.

100 lens unit (interchangeable lens device)
111 Camera microcomputer 113 Aperture actuator 114 Aperture unit 133 Aperture operation ring 200 Camera body 205 Camera microcomputer

Claims (16)

An interchangeable lens device that is detachably and communicatively attached to the imaging device,
An aperture unit with a variable aperture position,
An operation member that can be operated by a user,
Lens control means for controlling the drive of the aperture unit,
The lens control means includes:
For each control cycle of the aperture unit, calculate a target aperture position and a drive speed of the aperture unit according to the operation amount of the operation member,
The interchangeable lens device according to claim 1, wherein the drive speed is a speed at which the aperture unit reaches the target aperture position for each control cycle in a time longer than the control cycle. A detecting unit for detecting an operation amount of the operation member,
The lens control means includes:
2. The target aperture position is calculated by using an operation amount detected by the detection unit and a drive amount of the aperture unit for each unit operation amount of the operation member for each control cycle. The interchangeable lens device according to the above.   The interchangeable lens device according to claim 2, wherein the lens control unit receives the control cycle and the drive amount for each unit operation amount from the imaging device. The lens control means includes:
Transmitting the operation amount and the driving speed to the imaging device;
The driving of the aperture unit is controlled in response to receiving an aperture driving command including a driving amount of the aperture unit according to the operation amount and the driving speed from the imaging device. 4. The interchangeable lens device according to 3. An imaging device in which an interchangeable lens device is detachably and communicably mounted,
The interchangeable lens device includes an aperture unit having a variable aperture position, and an operation member that can be operated by a user, and for each control cycle of the aperture unit, a target aperture position corresponding to an operation amount of the operation member. The drive speed of the aperture unit is calculated, and the drive speed is such a speed that the aperture unit reaches the target aperture position for each control cycle in a longer time than the control cycle,
The imaging device,
An image sensor that captures a subject image formed by light passing through the aperture unit;
An imaging apparatus comprising: the interchangeable lens device includes a camera control unit that transmits the control cycle. The interchangeable lens device includes a detection unit that detects an operation amount of the operation member, and for each control cycle, determines the target aperture position using the operation amount and a drive amount for each unit operation amount of the aperture unit. Calculate,
The imaging apparatus according to claim 5, wherein the camera control unit transmits the drive amount for each unit operation amount to the interchangeable lens device. The camera control means,
Receiving the operation amount and the driving speed from the interchangeable lens device,
The imaging apparatus according to claim 6, wherein an aperture driving command including a driving amount of the aperture unit according to the operation amount and the driving speed is transmitted to the interchangeable lens device. An imaging device in which an interchangeable lens device is detachably and communicably mounted,
The interchangeable lens device includes an aperture unit having a variable aperture position, and an operation member that can be operated by a user,
The imaging device,
An image sensor that captures a subject image formed by light passing through the aperture unit;
Camera control means,
The camera control means,
For each control cycle of the aperture unit, calculate a target aperture position and a drive speed of the aperture unit according to the operation amount of the operation member,
The imaging apparatus according to claim 1, wherein the drive speed is a speed at which the aperture unit reaches the target aperture position for each control cycle in a time longer than the control cycle. The interchangeable lens device has a detection unit that detects an operation amount of the operation member,
The camera control means,
Receiving the operation amount from the interchangeable lens device,
The imaging apparatus according to claim 8, wherein the target aperture position is calculated using the operation amount and the drive amount of the aperture unit for each unit operation amount of the operation member for each control cycle.   10. The imaging apparatus according to claim 9, wherein the camera control unit transmits an aperture driving command including a driving amount of the aperture unit according to the operation amount and the driving speed to the interchangeable lens device. . An interchangeable lens device that is detachably and communicatively attached to the imaging device,
An aperture unit with a variable aperture position,
An operation member that can be operated by a user,
Detecting means for detecting an operation amount of the operation member,
The imaging apparatus calculates a target aperture position and a drive speed of the aperture unit according to an operation amount of the operation member for each control cycle of the aperture unit. A speed that reaches the target throttle position in a time longer than the control cycle,
The interchangeable lens device according to claim 1, further comprising a lens control unit configured to transmit the operation amount to the imaging device.   The lens control unit controls the drive of the aperture unit in response to receiving an aperture drive command including the drive amount and the drive speed of the aperture unit according to the operation amount from the imaging device. The interchangeable lens device according to claim 11, wherein: An interchangeable lens device that is detachably and communicably mounted to an imaging device, a control method of the interchangeable lens device including an aperture unit having a variable aperture position and an operation member that can be operated by a user,
Calculating a target aperture position according to the operation amount of the operation member for each control cycle of the aperture unit;
Calculating the drive speed of the aperture unit for each control cycle,
The control method of the interchangeable lens device, wherein the drive speed is a speed at which the aperture unit reaches the target aperture position for each control cycle in a longer time than the control cycle. A method of controlling an imaging device in which an interchangeable lens device is detachably and communicably mounted,
The interchangeable lens device includes an aperture unit having a variable aperture position, and an operation member that can be operated by a user,
The control method includes:
Calculating a target aperture position according to the operation amount of the operation member for each control cycle of the aperture unit;
Calculating the drive speed of the aperture unit for each control cycle,
The control method for an imaging apparatus according to claim 1, wherein the drive speed is a speed at which the aperture unit reaches the target aperture position for each control cycle in a time longer than the control cycle.   The computer according to claim 13, wherein the computer is an interchangeable lens device detachably and communicably mounted to the imaging apparatus, the computer having an aperture unit having a variable aperture position and an operation member operable by a user. A computer program for executing a process according to the control method.   15. A process according to the control method according to claim 14, which is performed on a computer of an imaging apparatus in which an interchangeable lens device having an aperture unit having a variable aperture position and an operation member operable by a user is detachably and communicably mounted. A computer program characterized by executing the following.