Imaging device, control method for imaging device, and program

Abstract

To provide a system associated with interchangeable lens diaphragm driving and photometry for reducing starting time of an imaging apparatus.SOLUTION: An imaging apparatus comprises: an interchangeable lens device that is mounted to be removable and communicable on the imaging apparatus; communication means that communicates with the interchangeable lens device; image acquisition means that acquires an image by imaging a subject through an optical system including the interchangeable lens device; control means that controls the image acquisition means; and drive time acquisition means that acquires drive time in which diaphragm of the interchangeable lens device is opened from a first state to predetermined size of time required for opening processing of the diaphragm of the interchangeable lens device. The control means causes the image acquisition means to start acquisition of an image at a point of time when a power supply of the imaging apparatus is turned on and the drive time acquired by the acquisition means is passed from a point of time when the communication means received a request of the opening processing of the diaphragm from the interchangeable lens device.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an interchangeable lens device having a variable aperture that is detachable, or an imaging device including a lens device having a variable aperture.

Background Art

[0002] Some interchangeable lens devices with variable apertures close the variable aperture to prevent external light passing through the interchangeable lens device from irradiating the shutter or imaging element inside the imaging device and causing them to deteriorate when the power of the imaging device is off. In Patent Document 1, when an operation to turn on the power of the imaging device is performed with the variable aperture closed, an initial positioning of the aperture blades of the lens (an "opening process" of opening so that the aperture value is minimized, which is referred to as a "reset process" here) is performed. Thereafter, an invention is disclosed in which photometry is started at the timing when the imaging device receives a notification of completion of reset of the aperture blades. Further, in Patent Document 2, an invention is disclosed in which, in response to detecting power supply from the imaging device when the interchangeable lens device is attached to the imaging device, the driving means drives the variable aperture from the closed state to the open state without receiving communication for controlling the variable aperture from the imaging device.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, since driving is performed after minimizing the aperture of the interchangeable lens, it takes time to start up the imaging device. Also, in Patent Document 2, it was necessary to wait for completion of the opening process of the lens.

[0005] Therefore, an object of the present invention is to speed up the startup time of a camera by providing a system related to the aperture drive and photometry of an interchangeable lens for shortening the startup time of an imaging device.

Means for Solving the Problems

[0006] To achieve the above object, the present invention provides an imaging device, comprising: an interchangeable lens device detachably and communicably attached to the imaging device; communication means for communicating with the interchangeable lens device; image acquisition means for acquiring an image by imaging a subject through an optical system including the interchangeable lens device; control means for controlling the image acquisition means; and drive time acquisition means for acquiring a drive time required for an aperture of the interchangeable lens device to open from a first state to a predetermined size among times required for an aperture opening process of the interchangeable lens device. The control means starts image acquisition by the image acquisition means at a time point when a time corresponding to the drive time acquired by the drive time acquisition means has elapsed since the power of the imaging device is turned on and the communication means receives a request for an aperture opening process from the interchangeable lens device.

Effects of the Invention

[0007] According to the present invention, it is possible to shorten the time from when the power of the imaging device is turned on (the start time of power supply to the interchangeable lens device) until the variable aperture in the interchangeable lens device is driven to an open state and the imaging device becomes capable of imaging.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Best Mode for Carrying Out the Invention

[0009] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims. Although a plurality of features are described in the embodiments, not all of these plurality of features are essential to the invention, and the plurality of features may be arbitrarily combined. Further, in the accompanying drawings, the same or similar configurations are denoted by the same reference numerals, and redundant descriptions are omitted.

[0010] (First Embodiment) Hereinafter, with reference to FIG. 1 and the like, the configuration and processing flow of an imaging device according to the first embodiment of the present invention will be described. In the present embodiment, a digital camera is exemplified as the imaging device, but the present invention is not limited thereto. For example, the present invention can also be applied to an imaging device connected to an interchangeable lens having a variable aperture, a smartphone or a tablet having an optical system with a variable aperture built therein, and other electronic devices having an imaging function.

[0011] FIG. 1 illustrates the configuration of an imaging system (hereinafter referred to as a camera system) including an imaging device (hereinafter referred to as “camera 200”) according to the first embodiment of the present invention and a lens device (hereinafter referred to as “lens unit 100”) as an imaging accessory.

[0012] The lens unit 100 is an interchangeable lens that is removably attached to the camera 200. In this embodiment, the case where the interchangeable lens unit 100 can be attached to and detached from the camera 200 is described, but the lens unit may be provided integrally with the camera. In this camera system, a step-synchronous communication method is used to transmit requests for controlling various actuators from the camera to the lens. On the other hand, various lens information such as the focal length, the driving state of the focus motor, the driving state of the aperture unit, and the driving state of the anti-shake unit is transmitted from the lens to the camera. In the case of an imaging device in which the lens and the camera body are integrated, all information including various lens information may be configured to be collectively managed by the imaging device.

[0013] The lens unit 100 and the camera 200 are mechanically and electrically connected via a mount 300 which is a coupling mechanism. The lens unit 100 obtains power from the camera 200 via a power terminal portion (not shown) provided on the mount 300, and supplies power necessary for operation to various actuators and the lens control unit 111 in the lens unit 100 described later. Also, the lens unit 100 and the camera 200 communicate with each other via a communication terminal portion (communication units 112 and 208 described later) provided on the mount 300.

[0014] The lens unit 100 has an imaging optical system, and the imaging optical system includes, in order from the subject OBJ side, a field lens 101, a zoom lens (variable magnification lens) 102 that performs zooming, an aperture unit 114 that adjusts the amount of light, an anti-shake lens 103, and a focus lens 104 that performs focus adjustment. Note that the imaging optical system of the lens unit 100 is not limited to the above-described configuration.

[0015] The zoom lens 102 and the focus lens 104 are respectively held by lens holding frames 105 and 106. The lens holding frames 105 and 106 are guided to be movable in the optical axis direction (indicated by a dashed line in the figure) by a guide shaft (not shown) and are driven in the optical axis direction by stepping motors 107 and 108. The stepping motors 107 and 108 move the zoom lens 102 and the focus lens 104 in synchronization with drive pulses respectively. The anti-shake lens 103 reduces image blur caused by camera shake (such as hand shake) by shifting in a direction perpendicular to the optical axis of the imaging optical system.

[0016] The lens control unit 111 is constituted by, for example, a microcomputer or the like and serves as control means for the lens that controls the operations of the respective parts within the lens unit 100. Further, the lens control unit 111 receives, via the lens communication unit 112, control request commands for various actuators within the lens unit 100 and transmission request commands for lens information transmitted from the camera 200. In this embodiment, a step-synchronous communication method is adopted as the communication method, and communication is performed by a data transmission terminal from the camera to the lens, a data reception terminal from the lens to the camera, and an RTC terminal that supplies a communication start timing from the camera to the lens, which will be described later. The detailed communication flow control will be described later.

[0017] In addition, the lens control unit 111 can control each part of the lens in response to a control request command from the camera 200, and transmit lens data corresponding to a transmission request command for lens information via the lens communication unit 112 to the camera 200. Further, the lens control unit 111 can output drive signals to the zoom drive circuit 119 and the focus drive circuit 120 in response to commands related to zooming and focusing among the control commands, and drive the stepping motors 107 and 108. Thereby, zoom processing for controlling the zoom operation by the zoom lens 102 and AF processing for controlling the focus adjustment operation by the focus lens 104 are performed.

[0018] The aperture control unit 111 outputs a drive signal to the aperture drive circuit 121 based on an input signal from the A / D conversion circuit 123 described later, and drives the aperture actuator 113. Thereby, the operation of adjusting the amount of light by the aperture unit 114 is controlled.

[0019] Furthermore, the lens control unit 111 drives a vibration-proof actuator (such as a voice coil motor) 126 via the vibration-proof drive circuit 125 in response to the shake of the camera detected by a shake sensor (not shown) such as a vibration gyro provided in the lens unit 100. Thereby, a vibration-proof process for controlling the shift operation (vibration-proof operation) of the vibration-proof lens 103 is performed.

[0020] The manual focus ring 130 is an operation unit that enables a user to give an instruction for drive control to the lens unit 100 during manual focus. The encoder sensor 131 detects the position of the manual focus ring and provides position information to the lens control unit 111.

[0021] The aperture unit 114 is configured to include aperture blades 114a and 114b. The states of the aperture blades 114a and 114b are detected by the Hall element 115 and input to the lens control unit 111 via the amplifier circuit 122 and the A / D conversion circuit 123. Note that, for the sake of convenience, only two aperture blades are shown in FIG. 1, but the number thereof can be changed as appropriate, and an existing configuration can be used as appropriate.

[0022] The non-volatile memory 127 is an electrically erasable and recordable memory, and for example, an EEPROM or the like is used. In the non-volatile memory 127, constants, programs, etc. for the operation of the lens control unit 111 are stored. Here, the program refers to a program for executing various flowcharts described later in this embodiment. Further, type information of the lens unit 100 described later may be stored in advance as data in the non-volatile memory 127. The type information may include, for example, the processing time required for the aperture blades 114a and 114b to reach the reset position.

[0023] The imaging element 201 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor. In this embodiment, a CMOS sensor is used as the imaging element 201. The CMOS sensor sequentially performs charge accumulation and reading while shifting the time for each horizontal line. An imaging control circuit (not shown) controls the charge accumulation and reading of the imaging element 201 according to an instruction from a camera control unit 205 described later. The imaging element 201 photoelectrically converts a subject image formed by an imaging optical system in the lens unit 100 and outputs an electrical signal (analog signal).

[0024] The A / D conversion unit 202 converts the analog signal from the imaging element 201 into a digital signal.

[0025] The image processing unit 203 performs various image processes on the digital signal from the A / D conversion unit 202 to generate a video signal, and the acquired image information is stored in a memory 210 such as a DDR (DOUBLE DATA RATE SDRAM). That is, it has a role as an image acquisition means. The image processing unit 203 can generate focus information indicating the contrast state (focus state of the imaging optical system) of the subject image and luminance information representing the exposure state from the video signal. Also, the video signal is output to the display unit 206, and the display unit 206 can display the video signal as a live view image used for confirmation of the composition, focus state, etc.

[0026] The non-volatile memory 211 is an electrically erasable and recordable memory, and for example, an EEPROM or the like is used. In the non-volatile memory 211, constants, programs, etc. for the operation of the camera control unit 205 are stored. Here, the program refers to a program or the like for executing various flowcharts described later in this embodiment. Also, in the non-volatile memory 211, data such as the processing time required for the aperture blades 114a and 114b to reach the reset position based on the type information of the lens unit 100 described later is stored in advance as data.

[0027] The camera control unit 205 controls each part of the camera 200 in response to inputs from camera operation members such as an imaging instruction switch (not shown) and various setting switches. It reads out the program recorded in the aforementioned non-volatile memory 211, expands it in a system memory such as a RAM (not shown), and executes it to realize each process of the present embodiment described later. For example, the camera control unit 205 transmits a control command regarding the zoom operation of the zoom lens 102 to the lens control unit 111 via the camera communication interface circuit 208 (hereinafter referred to as the "communication unit 208"), which is a communication circuit, in response to the operation of a zoom switch (not shown).

[0028] Furthermore, the camera control unit 205 transmits a control command regarding the light amount adjustment operation of the aperture unit 114 according to the luminance information and the focus adjustment operation of the focus lens 104 according to the focus information to the lens control unit 111 via the communication unit 208.

[0029] Next, the communication circuit configured between the camera 200 and the lens unit 100 and the communication process performed therebetween will be described with reference to FIG. 2 and the like.

[0030] The camera control unit 205 functions as a communication method management means and a transmission request means for the lens unit 100. Also, the lens control unit 111 functions as a lens data generation means and a data transmission means to the camera 200.

[0031] FIG. 2 shows the configuration of the communication units 208 and 112 configured between the camera 200 and the lens unit 100 in the present embodiment.

[0032] The camera control unit 205 and the lens control unit 111 perform data communication via the communication control units 209 and 116 provided in the communication units 208 and 112. The communication control units 209 and 116 communicate via the communication terminal unit provided in the mount 300 described above. In this embodiment, as shown in the mount 300, although a three-wire step-synchronous serial communication method is used as the communication method, it is not limited thereto. Here, the three wires referred to here are a communication request signal RTS, a communication line DCL for camera data signals, and a communication line DLC for lens data signals.

[0033] The communication request signal RTS is a signal sent from the camera 200 as a communication master to the lens unit 100 as a slave. The data signal DCL is a signal including control commands, transmission request commands, etc. from the camera 200 to the lens unit 100.

[0034] The data signal DCL is a signal including command information such as an actuator control request transmitted from the camera 200 to the lens unit 100. The data signal DLC is a signal including lens data etc. transmitted from the lens unit 100 to the camera 200.

[0035] When adopting step-synchronous communication, the camera 200 and the lens unit 100 do not transmit and receive data synchronized with a common clock signal, but previously define the communication speed at which they communicate with each other, and transmit and receive at a communication bit rate according to this definition. Here, the communication bit rate indicates the amount of data that can be transferred per second, and the unit is expressed in bps (bits per second).

[0036] Hereinafter, with reference to the flowchart of FIG. 3, the processing when the power of the camera 200 is turned off and then turned on again will be described. This flowchart is executed by the camera control unit 205 and the lens control unit 111 controlling each part of the camera 200 and the lens unit 100 according to a program.

[0037] First, in S300, the power of the camera 200 is on.

[0038] In S301, the camera control unit 205 determines whether the power of the camera 200 has been turned off. If it is determined that the power of the camera 200 has been turned off, the process proceeds to S302. On the other hand, if the power is on, the determination in S301 is made again. In addition, even when the camera control unit 205 does not determine that the power of the camera is off in S301, after a certain period of time (predetermined time) has elapsed, the power of the camera 200 may be internally turned off according to the instruction of the camera control unit 205.

[0039] In S302, the camera control unit 205 issues a control request to the lens control unit 111. The lens control unit 111 that has received the control request outputs a drive signal to the aperture drive circuit 121 to drive the aperture actuator 113, and transitions the aperture unit 114 to the small aperture state so that the interval between the aperture blades 114a and 114b becomes the minimum. When the aperture unit 114 transitions to the small aperture state, the process proceeds to S303. Also, even in the case where the power of the camera 200 is internally turned off as described in S301 above, the camera control unit 205 may issue a control request to the lens control unit 111 to transition the aperture unit 114 to the small aperture state.

[0040] In S303, the camera control unit 205 sets the power of the camera 200 to the off state. Therefore, in the state where the power is off in S303, the aperture unit is in the small aperture state, and it is possible to suppress the external light from irradiating the shutter and the imaging element in the imaging device and causing deterioration.

[0041] Subsequently, in S304, the camera control unit 205 determines whether the power of the camera 200 has been turned on. If it is determined that the power of the camera 200 has been turned on, the process proceeds to S305, and otherwise, the determination in S304 is made again. In addition, in S304, the camera control unit 205 may internally activate the power of the camera by detecting the pressing of some button or the like instead of determining the power-on operation, and execute the processes after S307.

[0042] In S305, initialization processing of a communication port for enabling communication between the lens unit 100 and the camera 200 is performed, and the process proceeds to S306.

[0043] In S306, the camera control unit 205 determines whether the lens unit 100 is attached to the camera 200. If it is attached, the process proceeds to S307. Note that the reason for determining whether the lens is attached or not in S306 is that the lens may have been removed while the power was off between S303 and S304. If it is determined in S306 that the lens 100 is not attached, the process proceeds to the process of S311.

[0044] In S307, the camera control unit 205 requests the lens control unit 111 to transmit the type information of the attached lens unit 100 through the lens communication unit 112 and the communication unit 208. In response to the request, the lens control unit 111 transmits the type information of the attached lens unit 100 to the camera control unit 205 through the lens communication unit 112 and the communication unit 208. Thus, the camera control unit 205 acquires the type information of the lens unit 100.

[0045] In S308, the camera control unit 205 acquires the processing time Ta (driving time) required for the aperture blades 114a and 114b based on the type information of the lens unit 100 acquired in S307 to reach the reset position from the non-volatile memory 211 of the camera 200, and the process proceeds to S309. Note that the method for acquiring the driving time is not limited to this. For example, the processing time Ta required for the aperture blades 114a and 114b based on the type information of the lens unit 100 to reach the reset position may be acquired from the non-volatile memory 127 on the lens unit 100 side described above.

[0046] Also, when only the driving time Ta is stored in the non-volatile memory 211 of the camera 200, the non-volatile memory of the camera 200 does not store information regarding the new lens unit 100. Therefore, it is also possible to adopt a configuration in which the driving time Ta is stored in the non-volatile memory 127 of the new lens unit 100, and the process of S310 is performed by acquiring the driving time Ta when communicating with the lens control unit 111 in S307.

[0047] The driving time Ta obtained here may be the time it takes for the aperture blades 114a and 114b of the lens unit 100 to reach the reset position. Alternatively, it may be the time it takes to reach the open position. Here, the time it takes to reach the open position in the present embodiment refers to the time it takes for the aperture blades 114a and 114b of the lens unit 100 to first reach the open position from the small aperture state. That is, note that it is not the time when reaching the open position via the reset position. Or, if the aperture blades 114a and 114b of the lens unit 100 are moved from the small aperture state, and the quality of the live view display is maintained within a predetermined condition based on the photometric result thereafter, it may be a shorter time than reaching the open position. The open position here indicates the position when the specified aperture value of the aperture blades 114a and 114b of the lens unit 100 becomes the minimum value. Also, the reset position indicates a state in which the aperture blades 114a and 114b of the lens 100 are opened further outside than when the specified aperture value becomes the minimum value. The reason for defining the reset position here is that there is an imaging system that performs a process of transitioning the aperture unit 114 to the reset position once before stopping at the open position when performing the reset process of the aperture unit 114.

[0048] Here, the reset process will be described. The reset process refers to a series of processes in which the aperture blades 114a and 114b of the lens 100 are driven from the small aperture state to the reset position once and then to the open position. The detachable lens unit attached to the imaging device is composed of a focus lens, an anti-shake lens, aperture blades, a lens control unit, etc. The imaging device can be equipped with various lens units. However, among the lens units, there are some that require a reset operation after the imaging device detects the lens unit. In this reset operation, the initial position of the focus lens, the initial position of the anti-shake lens, and the initial position of the aperture blades are set. By setting the initial positions of each lens, correct lens drive control is realized. Also, setting the initial position of the aperture blades means opening them in the direction in which the aperture value becomes minimum, and by opening the aperture blades to the fully open side, the accuracy of the aperture is ensured. Furthermore, these respective processes are processed in parallel from the start of the reset process, and the processing time of each process differs depending on the hardware configuration of the lens unit.

[0049] Subsequently, in S309, the lens control unit 111 receives a reset request command for the lens unit 100 from the camera 200 via the lens communication unit 112. Based on the input signal from the A / D conversion circuit 123, the lens control unit 111 outputs a drive signal to the aperture drive circuit 121 to drive the aperture actuator 113. Then, the reset process of the aperture unit 114 is started, and the process proceeds to S310.

[0050] In S310, the camera control unit 205 determines whether the processing time Ta has elapsed since the reset process was started in S309. When the processing time Ta has elapsed, the process proceeds to S311, and the camera 200 starts photometry processing via the imaging element 201.

[0051] In S311, the camera control unit 205 has a photometric start request function and requests a photometric value from the image processing unit 203. The image processing unit 203 performs a predetermined arithmetic process (photometric process) based on the amount of light incident through the optical system of the lens unit 100 on the imaging device 201, and transmits the obtained photometric value to the camera control unit 205. Further, the imaging device 201 photoelectrically converts the subject image formed by the imaging optical system in the lens unit 100 and outputs an electrical signal (analog signal). The A / D conversion unit 202 converts the analog signal output from the imaging device 201 into a digital signal and then outputs it to the image processing unit 203. When the above processing is completed, the process proceeds to S312.

[0052] Note that when transitioning to the photometric process in step S311, the reset process of the aperture blades 114a and 114b of the lens 100 may be stopped. In that case, communication is performed so that the camera control unit 205 controls the aperture of the lens control unit 111 based on the aperture value set automatically or based on the user's setting in the camera 200 thereafter. On the other hand, the reset process of the aperture blades 114a and 114b of the lens unit 100 may be continued even after the processing time Ta has elapsed in S310.

[0053] Here, the photometric process will be described. Usually, when photometry is performed before the aperture blades are opened, it is difficult to obtain a highly accurate photometric result. Especially when photometry is performed while opening the aperture blades, the photometric process may vary and there is a high possibility that a sufficient photometric value cannot be obtained. For this reason, it is common to start the photometric process in conjunction with the completion of the aperture blade opening process (moving from the small aperture state via the reset position to the finally open position). Note that this case has a specification aiming at speeding up the startup of the camera 200 as described later.

[0054] In S312, the image processing unit 203 performs various image processes on the digital signal output from the A / D conversion unit 202 to generate a video signal. Then, based on the photometric value obtained in S311, the image processing unit 203 starts preparing a live view image for displaying the video signal on the display unit 206.

[0055] In the above flow, the driving time Ta obtained in S308 is preferably as follows. For example, it is the time from the small aperture state to reaching the open position without passing through the reset position, or a time shorter than reaching the open position as long as the quality of the live view display is maintained as a result of the photometry process in S311. In this case, the photometry process is started before the aperture of the aperture unit 114 reaches the open position after passing through the reset position. As a result, it is possible to prepare the live view image without waiting for the aperture of the aperture unit 114 to reach the open position after passing through the reset position.

[0056] Hereinafter, with reference to FIG. 4, the timing at the time of camera startup will be specifically described.

[0057] In FIG. 4(a), a graph shows that the aperture unit 114 receives a reset request from the small aperture state, transitions to the open position and the reset position, and returns a reset completion after transitioning to the open position again. FIG. 4(b) shows the main startup processes performed in the camera 200 from when the power of the camera is turned on, and the time from the reset request of the aperture unit 114 to the completion of aperture opening is shown as T1 to T2. Also shown is the case where the Ta time held in S308 is the time until the aperture blades 114a and 114b of the lens unit 100 reach the open position, and it is a diagram when the time from the reset request in FIG. 4(a) to t2 is taken as the Ta time.

[0058] When the photometry process of S311 is started at the time when the t2 time has elapsed in FIG. 4(b), in the conventional camera, the photometry process that started at T2 can be started at T2a. That is, it is shown that the time until the live view image is displayed is shortened from T3 to T3a.

[0059] As described above, in this embodiment, photometry is started without waiting for all of the aperture opening processes (processes from receiving a reset request from the small aperture state, transitioning to the open position and the reset position, and transitioning to the open position again) of the lens unit 100. Thereby, high-speedization of the live view display of the camera 200 can be realized.

[0060] (Other embodiments) The present invention can also be realized by supplying a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or a storage medium, and causing one or more processors in a computer of the system or apparatus to read and execute the program. It can also be realized by a circuit (for example, ASIC) that implements one or more functions.

[0061] As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist thereof.

Explanation of reference numerals

[0062] 100 Lens unit (interchangeable lens) 101 Field lens 102 Zoom lens 103 Vibration-proof lens 104 Focus lens 105 Lens holding frame 106 Lens holding frame 107 Stepping motor 108 Stepping motor 111 Lens microcomputer 112 Communication unit (lens side) 113 Diaphragm actuator 114 Diaphragm unit 115 Hall element 119 Zoom drive circuit 120 Focus drive circuit 121 Diaphragm drive circuit 122 Amplification circuit 123 A / D conversion circuit 125 Vibration-proof drive circuit 126 Vibration-proof actuator 127 Non-volatile memory 130 Manual focus ring 131 Encoder sensor 200 Imaging device body 201 Imaging element 202 A / D conversion unit 203 Image processing unit 204 Recording unit 205 Camera microcomputer 206 Display unit 207 Display magnification operation unit 208 Communication unit (camera side) 211 Non-volatile memory (camera) 300 Mount

Claims

1. An imaging device, An interchangeable lens device that is detachably and communicably attached to the imaging device, Communication means for communicating with the interchangeable lens device, Image acquisition means for acquiring an image by imaging a subject through an optical system including the interchangeable lens device, Control means for controlling the image acquisition means, and having, The control means acquires a driving time from when the aperture of the interchangeable lens device is in a small aperture state until it opens to a predetermined size among the times required for the aperture opening process of the interchangeable lens device, The imaging device is characterized in that when the driving time has elapsed from the time when the control means receives a request for the interchangeable lens device to start an aperture opening process, the control means causes the image acquisition means to start photometry processing.

2. The predetermined size is any one of the aperture size at the position where the aperture of the interchangeable lens device reaches open, the position where it reaches the reset position, and the position where the quality of the image acquired by the image acquisition means satisfies a predetermined condition after receiving a request for an opening process. The imaging device according to claim 1, characterized in that.

3. The interchangeable lens device has driving means for driving the aperture, The driving means is characterized in that when the power of the imaging device is turned off, the aperture is set to a small aperture state. The imaging device according to claim 1.

4. The interchangeable lens device has driving means for driving the aperture, The driving means is characterized in that the aperture opening process of the interchangeable lens device is continued even after the driving time has elapsed. The imaging device according to claim 1.

5. The imaging device according to claim 1, characterized in that it has storage means for storing the driving time from when the aperture is in a small aperture state until it opens to a predetermined size.

6. The imaging device further comprises a recording means for recording a driving time from a state where the aperture is in a small aperture state to when it opens to a predetermined size. The communication means communicates with the interchangeable lens device, and acquires type information of the interchangeable lens device being mounted. The control means acquires the driving time based on the type information and the driving time recorded by the recording means. The imaging device according to claim 1, characterized in that.

7. The interchangeable lens device further comprises a recording means for recording a driving time from a state where the aperture of the interchangeable lens device is in a small aperture state to when it opens to a predetermined size. The control means acquires the driving time recorded by the recording means. The imaging device according to claim 1, characterized in that.

8. A control method for an imaging device, comprising: A communication step of communicating with an interchangeable lens device detachably and communicably mounted on the imaging device; A driving time acquisition step of acquiring a driving time from a state where the aperture of the interchangeable lens device is in a small aperture state to when it opens to a predetermined size, among the time required for the aperture opening process of the interchangeable lens device; An image acquisition step of imaging a subject through an optical system including the interchangeable lens device to acquire an image. When a driving time has elapsed from a time point when a request for starting an aperture opening process is received from the interchangeable lens device in the communication step, photometry processing in the image acquisition step is started. A control method for an imaging device, characterized in that.

9. A program for causing a computer of the imaging device to execute processing according to the control method according to claim 8.

Images