JP2012165068A - Imaging apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize appropriate exposure control corresponding to diaphragm performance of an interchangeable lens without using a special device and without deteriorating image quality.SOLUTION: A lens interchangeable imaging apparatus can control exposure of imaging means by controlling a diaphragm and at least one of a gain and accumulation time of the imaging means in accordance with subject luminance. In a process for receiving a luminance correction amount for minimum resolution of the diaphragm and information on time between the transmission of a diaphragm control signal and the drive of the diaphragm from an interchangeable lens and for driving the diaphragm by the minimum resolution when the minimum resolution of the diaphragm is second resolution larger than first resolution, the gain or the accumulation time is changed to complement the luminance correction amount while the diaphragm is stopped, and a luminance change by the change of the gain or the accumulation time is reset at timing when the diaphragm is driven based on information on the time.

Description

  The present invention relates to an imaging apparatus to which an interchangeable lens can be attached.

  In recent years, in an imaging apparatus such as an interchangeable lens type digital still camera in which a lens group for guiding light to an imaging system such as an imaging element can be freely exchanged, not only a conventional still image shooting function but also a function of shooting a moving image The number of installed models is increasing. In addition, an imaging device such as a digital camcorder that shoots a moving image can be mounted with an interchangeable lens for a digital still camera. Since most interchangeable lenses for digital still cameras have been developed specifically for still image shooting, the accuracy of the F value of the diaphragm blades in the interchangeable lens is high, but the resolution between the F values is often rough. . For this reason, it is difficult to perform aperture control that continuously and smoothly changes the exposure with these lenses, and when performing moving image shooting, the aperture control during shooting is often fixed. Therefore, in order to enable exposure control suitable for moving image shooting, a moving image shooting lens capable of finely controlling the aperture F value resolution and continuously and smoothly controlling it has been developed and sold.

  However, since the number of lenses still on the market is small, there are many cases where there are no interchangeable lenses with the aperture value and focal length necessary for photographing. Therefore, various methods have been proposed for shooting moving images with a still image shooting lens.

  In Patent Document 1, when performing moving image shooting using a conventional interchangeable lens for still image shooting with a rough aperture resolution, an adapter for moving image shooting including an ND filter is mounted between the camera and the lens. A method for realizing a smooth luminance change by controlling the ND filter is disclosed. When exposure control is performed using a still image shooting lens with a low resolution, the conventional still image shooting lens cannot follow the luminance change of the subject, and a sudden change in luminance occurs in the captured image. Therefore, exposure control suitable for moving image shooting is performed by performing exposure control on the sudden brightness change due to aperture control using the ND filter.

JP 2010-204303 A

  However, the patent document 1 has the following problems. First, when performing exposure adjustment with the ND filter, it is necessary to perform compensation by changing the exposure according to the amount covering the aperture diameter of the diaphragm. Therefore, the end face of the ND filter often exists within the aperture diameter of the diaphragm. When such a state occurs, incident light is reflected on the end face of the ND filter, which causes ghost and flare. Similarly, a large difference occurs between the vertical and horizontal resolutions, and the resolution of an image to be taken is significantly reduced, resulting in degradation of image quality.

  Further, when controlling the insertion position of the ND filter, there is a normal time lag from when the control signal for driving the ND filter is sent to when the ND filter is actually driven. A configuration in which this time lag is controlled in consideration of differences due to individual differences in adapters is not disclosed in Patent Document 1. Therefore, in the exposure control using the ND filter described in Patent Document 1, there is a possibility that a sudden luminance change due to the aperture control appears in the captured image.

  In addition to purchasing a video shooting adapter, the user needs to detach the adapter in consideration of still image shooting and video shooting, and shooting must be interrupted.

  The present invention has been made for the purpose of solving the problems of the prior art. An object of the present invention is to enable appropriate exposure control according to the aperture performance of the interchangeable lens without using a special device and without causing deterioration of image quality.

  In view of the above problems, the present invention is an imaging apparatus that can be attached with an interchangeable lens including a photographing optical system including a diaphragm and can communicate with the interchangeable lens, and detects light that has passed through the photographing optical system. The image pickup means for storing the charge and transferring the stored charge to generate the image pickup signal, and the drive of the stop can be controlled by transmitting the stop control signal to the attached interchangeable lens, so that the subject brightness can be controlled. In response, at least one of a gain or an accumulation time of the imaging unit and a control unit capable of controlling the exposure of the imaging unit by controlling the aperture, the control unit is equivalent to the minimum resolution of the aperture. Information about the brightness correction amount and the time from when the diaphragm control signal is transmitted until the diaphragm is driven is received from the interchangeable lens, and the second resolution whose minimum resolution is larger than the first resolution is received. Place In the process of driving the diaphragm by the minimum resolution, while the diaphragm is stopped, the gain or accumulation time is changed so as to complement the luminance correction amount, and the diaphragm is driven based on the information about the time. The imaging apparatus is characterized in that the change in luminance due to the change in gain or accumulation time is reset at the timing to be performed.

  According to the present invention, it is possible to perform appropriate exposure control according to the aperture performance of an interchangeable lens without using a special device and without causing deterioration of image quality.

1 is a block diagram illustrating an example of a schematic configuration of an imaging apparatus according to an embodiment of the present invention. The flowchart figure which shows the 1st Embodiment of this invention Example program diagram for exposure control The figure explaining the program diagram which concerns on embodiment of this invention The figure which shows the production | generation means of the program diagram which concerns on embodiment of this invention The flowchart figure which shows the 2nd Embodiment of this invention.

  FIG. 1 is a block diagram illustrating an example of a schematic configuration of an imaging apparatus 100 according to an embodiment of the present invention. The imaging apparatus 100 is an imaging apparatus body such as a so-called digital still camera or digital camcorder. The imaging apparatus 100 is configured to control the interchangeable lens 1 mounted on the lens mount unit 7 to generate and record a subject image.

  The interchangeable lens 1 is detachably attached to the lens mount portion 7 of the imaging device 100. The lens 2 in the interchangeable lens 1 guides light incident from the outside of the imaging device 100 to the inside of the imaging device 100. The interchangeable lens 1 can be changed to another interchangeable lens depending on the purpose of the user. In FIG. 1, the lens 2 is simplified and illustrated as a single lens, but the lens 2 is usually composed of a plurality of lenses. Further, by operating the lens 2 with a motor or the like, functions such as focusing and image stabilization correction can be realized, but description thereof is omitted in this embodiment.

  The diaphragm 3 is configured inside the interchangeable lens 1 and is a diaphragm blade that adjusts the amount of light incident from the outside of the imaging apparatus 100. The microcomputer 12 in the imaging apparatus drives the diaphragm from the lens control circuit 13 to the microcomputer 6 in the interchangeable lens 1 via the lens mount unit 7 based on the control data calculated by the lens control circuit 13. An aperture control signal is transmitted. The microcomputer 6 drives and controls the diaphragm drive motor 4 by driving power based on the diaphragm control signal. The diaphragm state detection circuit 5 detects the driving state of the diaphragm 3 and transmits the detection result to the microcomputer 12 in the imaging apparatus 100 via the lens mount unit 7. In the present embodiment, the driving power supplied to the diaphragm driving motor 4 is calculated by detecting the driving state of the diaphragm 3 by the diaphragm state detecting circuit 5, but the F value and driving power of the diaphragm 3 are calculated. The aperture state detection circuit 5 does not have to be provided.

  The image sensor 8 senses light that has passed through the lens 2 and accumulates charges, and transfers the accumulated charges to perform imaging. The image sensor 8 used in the present embodiment is composed of an XY address type CMOS image sensor. Alternatively, the image sensor 8 may be a CCD image sensor. The CDS / AGC circuit 9 samples and amplifies image information based on charges (image signals) stored in each pixel of the image sensor 8. Note that correlated double sampling (CDS) is performed for sampling, and automatic gain adjustment (AGC) is performed for amplification. The A / D converter 10 converts the image information (analog signal) output from the CDS / AGC circuit 9 into a digital signal. The digital signal processing circuit 11 performs various signal processing on the image information (digital signal) output from the A / D converter 10. The microcomputer 12 is a circuit called a microcontroller or simply a controller, and comprehensively controls the operation of the imaging apparatus 100. For example, the microcomputer 12 receives information such as luminance and color from the digital signal processing circuit 11 and performs various arithmetic processes.

  The lens control circuit 13 controls the drive unit in the interchangeable lens 1 based on the control by the microcomputer 12. In the present embodiment, based on the control data calculated by the lens control circuit 13, an aperture control signal is transmitted to the aperture drive motor 4 via the lens mount unit 7, and drive power is supplied by the microcomputer 6. . The lens control circuit 13 also calculates data relating to control timing such as speed and time for driving the diaphragm 3.

  The image sensor drive circuit 14 supplies drive pulses and the like for driving the image sensor 8 to the image sensor 8 based on the control by the microcomputer 12, and reads out the image captured by the image sensor 8 and the exposure time. Make adjustments. For example, the image sensor driving circuit 14 drives the image sensor 8 with a predetermined exposure time under the control of the microcomputer 12 according to a photometric value of an image captured by the image sensor 8. Supply. Thereby, in the imaging device, it is possible to adjust the exposure time of the imaging element 8 according to the photometric value of the captured image and read the image.

  The lens performance discrimination circuit 15 discriminates whether the lens mounted on the lens mount unit 7 is a moving image shooting lens or a still image shooting lens. When the lens performance discriminating circuit 15 discriminates it as a moving image photographing lens, exposure control is performed with a normal program diagram. Similarly, when it is determined that the lens is a still image shooting lens, a program that changes the gain or the shutter speed so that the program diagram generation / switching circuit 16 does not cause an abrupt brightness change due to exposure control based on the aperture resolution. Generate a diagram. Here, the shutter speed means the charge accumulation time of the image sensor 8. Then, exposure control is performed by switching to the generated program diagram.

  The luminance information detection circuit 17 detects a photometric value based on digital image data output from the microcomputer 12. The luminance information calculation circuit 18 calculates and normalizes the photometric value detected by the luminance information detection circuit 17 and converts it into a photometric value that can be easily calculated by the microcomputer 12. The microcomputer 12 performs exposure control based on the photometric value calculated by the luminance information calculation circuit 18.

  The recording medium 19 writes the image generated by the digital signal processing circuit 11 to an external memory such as a memory card. The memory 20 is a RAM or the like and temporarily stores data. For example, the memory 20 temporarily stores image data after being imaged by the image sensor 8 and processed by the digital signal processing circuit 11. A program for driving the imaging device 100 is also stored in the memory 20 and is sequentially called and executed by the microcomputer 12. Further, when the program diagram generated by the program diagram generation / switching circuit 16 is stored and the same interchangeable lens is mounted on the lens mount unit 7 again, the previously generated program diagram is called and used. Also used.

<First Embodiment>
In the operation of the imaging apparatus 100 in this embodiment, when an interchangeable lens is mounted on the lens mount unit 7, the unique lens ID of the mounted interchangeable lens is read by the microcomputer 6 in the interchangeable lens. The read lens ID is transmitted to the microcomputer 12 in the imaging apparatus via the lens mount unit 7 and the lens control circuit 13. The lens performance discrimination circuit 15 reads the lens ID of the interchangeable lens transmitted from the microcomputer 12 and compares it with the interchangeable lens data recorded in the memory 20. At this time, it is determined whether the transmitted lens ID is a still image capturing interchangeable lens, a moving image capturing interchangeable lens, or a lens having no lens ID.

  When it is determined from the lens ID that the lens is an interchangeable lens for moving image shooting, the aperture resolution of the interchangeable lens is fine so that it is possible to follow the luminance change of the subject, and exposure control is performed according to a normally used program diagram. .

  On the other hand, when it is determined that the lens is an interchangeable lens for taking a still image, the gain or shutter speed is set so that a sudden luminance change does not occur when the interchangeable lens mounted by the program diagram generation / switching circuit 16 is driven. Generate a diagram with modified And it switches to the program diagram created from the program diagram used when performing normal exposure control. That is, exposure control is performed using a program diagram in which the gain or shutter speed is changed.

  If it is determined that the interchangeable lens does not have a lens ID, it is unknown whether smooth exposure control is possible during moving image shooting, so the user is notified by displaying a warning message on a display device or the like.

  Thereafter, incident light from the interchangeable lens 1 is sensed by the image sensor 8 to image the subject. Then, the electric charge stored in each pixel of the image sensor 8 is output as an image signal in accordance with the drive pulse supplied from the image sensor drive circuit 14. The image signal output from the image sensor 8 is sampled and amplified by the CDS / AGC circuit 9. The image signal output from the CDS / AGC circuit 9 after sampling and amplification is converted into a digital signal by the A / D converter 10 and sent to the digital signal processing circuit 11. The digital signal processing circuit 11 performs various signal processing on the digital image signal output from the A / D converter 10.

  The luminance information detection circuit 17 detects luminance information based on the digital image signal output from the microcomputer 12 and detects a photometric value. The luminance information calculation circuit 18 calculates and normalizes the photometric value detected by the luminance information detection circuit 17 and converts it into a photometric value that can be easily calculated by the microcomputer 12. The microcomputer 12 performs exposure control based on the photometric value calculated by the luminance information calculation circuit 18. In exposure control, control is performed so that the detected photometric value converges to an appropriate exposure. At this time, the microcomputer 12 calculates a parameter for controlling the aperture 3 for achieving proper exposure. Based on the calculation result, an aperture control signal is transmitted from the lens control circuit 13 to the microcomputer 6 via the lens mount unit 7 to drive and control the aperture 3. At this time, based on the control data transmitted by the lens control circuit 13, the diaphragm drive motor 4 is driven according to the drive power supplied by the microcomputer 6 to drive the diaphragm 3. Here, there is a time difference (response time) from when the diaphragm control signal is transmitted until the diaphragm 3 is actually driven. It is a feature of the present invention that information about the response time is received from the interchangeable lens and used for exposure control, which will be described in detail later.

  In the present embodiment, as shown in FIG. 1, each configuration shows a configuration of an independent circuit unit, but all configurations or a part thereof may be configured in the microcomputer 12. Good.

  Next, a control method performed by the microcomputer 12 in the imaging apparatus 100 of the present embodiment will be described with reference to FIG. FIG. 2 is a flowchart illustrating a method for controlling the imaging apparatus 100 according to the embodiment of the present invention. Specifically, it is a diagram showing operations for performing the above-described exchange lens discrimination, program diagram generation, and switching.

  In the present embodiment, in step S101, it is determined whether or not an interchangeable lens is attached to the lens mount unit 7. The determination method determines that the interchangeable lens is mounted when lens communication is established between the microcomputer 6 in the interchangeable lens and the microcomputer 12 in the imaging apparatus. Here, when it is determined that the interchangeable lens is attached due to the establishment of the lens communication, the process proceeds to step S102, and the process proceeds to a process of acquiring the lens ID of the interchangeable lens in order to detect the performance of the interchangeable lens. On the other hand, if it is determined that the interchangeable lens is not attached, the process proceeds to step S109, waits until the interchangeable lens is attached, and the process of the flowchart ends.

  In step S102, the microcomputer 12 in the imaging apparatus communicates with the microcomputer 6 in the interchangeable lens to acquire a lens ID. Here, when the lens ID can be acquired, in step S103, the microcomputer 12 in the imaging apparatus refers to and searches the lens data table recorded in the memory 20, and selects lens data that matches the lens ID of the interchangeable lens. get. When the acquired lens data is an interchangeable lens for moving image shooting, it is considered that the aperture resolution is such that the exposure control can follow a small luminance change, and the process proceeds to step S104, where exposure control using a normal program diagram is performed.

  On the other hand, if the lens ID cannot be acquired in step S103, the mounted interchangeable lens is regarded as an unknown interchangeable lens having no lens data. With an unknown interchangeable lens, it is impossible to determine a moving image capturing interchangeable lens and a still image capturing interchangeable lens based on lens data. Therefore, in step S108, a notification that there is a possibility of being unsuitable for moving image shooting is displayed on the display device or the like as a warning, and in step S104, exposure control is performed using a normal program diagram.

  If it is determined in step S103 that the lens ID has been acquired but it is not a moving image capturing interchangeable lens, the aperture resolution is considered to be rough, and the process proceeds to step S105, where a program line suitable for a still image capturing interchangeable lens is obtained. Generate the figure.

  In step S105, the performance of the interchangeable lens is detected in order to generate a program diagram corresponding to the aperture resolution of the interchangeable lens for still image shooting. FIG. 3 shows an example of a program diagram normally used. In this program diagram, as the input value of incident light from the outside of the imaging apparatus increases, the exposure is controlled by controlling gain, aperture, and shutter speed in this order. The program diagram is not limited to this, and the gain, aperture, and shutter speed may be controlled in any order as the input value of incident light increases. Here, in the case of an interchangeable lens for moving image shooting, the aperture resolution is fine as shown in FIG. 3A, and fine exposure control is possible with respect to the input. However, in the case of an interchangeable lens for still image shooting, as shown in FIG. 3 (2), the aperture resolution is rough, fine exposure control cannot be performed for the input, and a luminance step occurs.

  Therefore, as shown in FIG. 4, compensation is performed by changing the gain or the shutter speed so as to eliminate the luminance step due to the stop. Here, parameters used for correction will be described as gains with reference to FIGS. Usually, when the F value of the diaphragm is changed, the resolution is rough, and thus a luminance level difference occurs. However, the gain is changed to compensate for the luminance level difference. It is necessary to perform the compensation control every time the F value of the aperture changes. Therefore, as shown in FIG. 4, it is necessary to alternately perform aperture control and gain control in the aperture control region.

  In order to perform gain control, as shown in FIG. 5, the amount of change in the F value of the aperture by one step, that is, the gain correction amount corresponding to the minimum resolution, and after the aperture control signal is transmitted until the actual aperture is driven. Response time information is required. These two parameters are obtained by communicating with the mounted interchangeable lens. From these two parameters, as shown in FIG. 5, in order to match the actual change in exposure with the actual change in brightness, in step S106, per unit time from the transmission of the diaphragm control signal to the actual driving of the diaphragm. Is calculated, and gain control for controlling the aperture region of the program diagram is determined. In FIG. 5, when the diaphragm is opened from the state where the diaphragm is opened, there is no luminance change due to the diaphragm between the actual driving of the diaphragm and the next driving. Therefore, by changing the gain based on the gain correction amount corresponding to the minimum resolution, correction is performed so as to complement the luminance step as shown by the dotted line in FIG. After the response time elapses after transmission of the aperture control signal, a luminance change due to aperture driving occurs at the timing when the aperture is driven. Therefore, the correction is reset by setting the correction gain to zero or decreasing. By controlling in this way, smooth exposure control is possible even if the aperture resolution is rough. The gain control is determined as described above, and a program diagram corresponding to the attached interchangeable lens is generated.

  Thereafter, in step S107, the program diagram to be used is switched to the generated program diagram, and in step S104, exposure control is performed using the switched program diagram.

  As described above, according to the present embodiment, the mounted replacement is performed using the gain compensation amount corresponding to the minimum resolution of the diaphragm and the response time information from when the diaphragm control signal is transmitted until the actual diaphragm is driven. Exposure control can be performed with a program diagram suitable for each lens.

  In the present embodiment, the case where gain control is performed in the aperture region of the program diagram has been described. However, the same control can be performed when control is performed using the shutter speed.

  Further, it has been described that when a lens with a rough aperture resolution is attached, a new program diagram is created and used for exposure control, and the program diagram is stored in the memory 20, but the present invention is not limited to this. . Exposure control is performed by reflecting gain or shutter speed control in a normal program diagram, and the control content may be stored in the memory 20 and recalled when the same lens is mounted and used for exposure control. .

<Second Embodiment>
When the normal lens ID can be acquired, the performance of the attached interchangeable lens is acquired by referring to the lens data table. However, when an interchangeable lens that cannot acquire a lens ID is attached, data necessary for discrimination between a still image capturing interchangeable lens and a moving image capturing interchangeable lens, and in the case of a still image capturing interchangeable lens, data necessary for generating a program diagram Can not get.

  As a second embodiment, when a unique lens ID of a mounted interchangeable lens cannot be acquired, appropriate exposure control is performed from information acquired in the mode using a mode for acquiring the performance of the interchangeable lens. A method will be described.

  In the present embodiment, an interchangeable lens performance acquisition mode capable of acquiring data for lens discrimination and program diagram generation even for an interchangeable lens whose lens ID is unknown is shown. This mode is used when NO in step S102 of FIG. The control content of the lens performance acquisition mode will be described with reference to FIG.

  In the present embodiment, in step S201, it is determined whether the lens performance acquisition mode is selected. If it is determined that the lens performance acquisition mode is selected, in step S202, the drive target position and the aperture control signal are transmitted to the microcomputer 6 in the interchangeable lens. On the other hand, if it is not determined that the lens performance acquisition mode has been selected, the process of the flowchart ends.

  In step S202, a time measurement counter is started to measure the time since the aperture control signal was transmitted to the interchangeable lens.

  In step S <b> 203, the luminance information detection circuit 17 detects the amount of incident light input to the image sensor 8. The detected incident light quantity is processed by the luminance information calculation circuit 18 and normalized. If the input of the incident light quantity changes after transmitting the aperture control signal, it is considered that the F value corresponding to the minimum resolution of the interchangeable lens has changed, and a counter value for time measurement from the transmission of the aperture control signal to the change of the incident light quantity is acquired. . Also, the input value of the incident light quantity before and after the F value corresponding to the minimum resolution is changed is acquired. Further, the lens drive amount from the stop control signal transmission to the change in incident light amount is acquired. On the other hand, if the input value does not change, it is considered that the F value corresponding to the minimum resolution of the interchangeable lens has not changed yet, and the process returns to step S203 while the time measurement counter is kept rotating in step S204.

  If it is determined in step S203 that the amount of incident light input to the image sensor 8 has changed, the process proceeds to step S205, in which it is determined whether the lens drive amount from the stop control signal transmission to the change in incident light amount is greater than a predetermined value. . If the drive amount is greater than the predetermined value, it is determined that the moving lens is an interchangeable lens for moving image shooting, the flowchart is ended, and exposure control is performed using a normal program diagram. On the other hand, when the drive amount is smaller than the predetermined value, it is determined that the lens is a still image taking interchangeable lens, and the process proceeds to step S206.

  In step S206, the gain correction amount and the control timing are calculated from the time from when the aperture control signal is transmitted until the input value of the incident light amount changes and the input value change amount.

  In step S207, the data calculated in step S206 is stored in the memory 20, thereby ending the flowchart of FIG. Thereafter, using the gain compensation amount and control timing data stored in the memory 20, exposure control is performed by changing the gain in the aperture region of the program diagram as in the first embodiment.

  By performing the above control, it is possible to discriminate between a moving image shooting interchangeable lens and a still image shooting interchangeable lens even for a lens whose lens ID of the interchangeable lens is unknown. In addition, when it is determined that the interchangeable lens is for still image shooting, appropriate exposure control can be performed even during moving image shooting.

  In the present embodiment, exposure control can be performed by changing the shutter speed instead of the gain.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

  Also, when a software program that realizes the functions of the above-described embodiments is supplied from a recording medium directly to a system or apparatus having a computer that can execute the program using wired / wireless communication, and the program is executed Are also included in the present invention.

  Accordingly, the program code itself supplied and installed in the computer in order to implement the functional processing of the present invention by the computer also realizes the present invention. That is, the computer program itself for realizing the functional processing of the present invention is also included in the present invention.

  In this case, the program may be in any form as long as it has a program function, such as an object code, a program executed by an interpreter, or script data supplied to the OS.

  As a recording medium for supplying the program, for example, a magnetic recording medium such as a hard disk or a magnetic tape, an optical / magneto-optical storage medium, or a nonvolatile semiconductor memory may be used.

  As a program supply method, a computer program that forms the present invention may be stored in a server on a computer network, and a connected client computer may download and program the computer program.

DESCRIPTION OF SYMBOLS 1 Interchangeable lens 2 Lens 3 Aperture 4 Aperture drive motor 5 Aperture state detection circuit 6 Microcomputer 7 Lens mount part 8 Image sensor 9 CDS / AGC circuit 10 A / D conversion circuit 11 Digital signal processing circuit 12 Microcomputer 13 Lens control circuit 14 Image sensor drive circuit 15 Lens performance discrimination circuit 16 Program diagram generation / switching circuit 17 Luminance information detection circuit 18 Luminance information calculation circuit 19 Recording medium 20 Memory 100 Imaging device

Claims (10)

An imaging device that can be attached with an interchangeable lens having a photographing optical system including an aperture and can communicate with the interchangeable lens,
Imaging means for detecting light passing through the imaging optical system and accumulating charges, transferring the accumulated charges to generate an imaging signal; and
By transmitting an aperture control signal to the attached interchangeable lens, the drive of the aperture can be controlled, and by controlling at least one of the gain or the accumulation time of the imaging unit and the aperture according to the subject brightness, Control means capable of controlling the exposure of the imaging means,
The control means receives from the interchangeable lens information about the luminance correction amount corresponding to the minimum resolution of the aperture and the time from when the aperture control signal is transmitted until the aperture is driven. In the case of the second resolution larger than the resolution of 1, in the process of driving the diaphragm by the minimum resolution, the gain or the accumulation time is changed so as to complement the luminance correction amount while the diaphragm is stopped, An imaging apparatus, wherein a change in luminance due to a change in gain or accumulation time is reset at a timing when a diaphragm is driven based on information about the time.   The imaging apparatus according to claim 1, wherein the control unit can determine a minimum resolution of a diaphragm of the interchangeable lens based on an ID of the interchangeable lens mounted. The control means is capable of controlling the exposure of the imaging means based on a first program diagram that defines at least one of gain or accumulation time and aperture control according to subject brightness,
When the minimum resolution of the diaphragm is the second resolution, the control means supplements the luminance correction amount with gain or accumulation time while the diaphragm is stopped in the process of driving the diaphragm by the minimum resolution. And changing the control of at least one of the gain and the accumulation time so as to reset the luminance change due to the gain or the accumulation time change at the timing when the diaphragm is driven based on the information about the time. The imaging apparatus according to claim 1, wherein a diagram is created, and at least one of a gain and an accumulation time and an aperture are controlled based on the second program diagram.   4. The control device according to claim 3, wherein when the minimum resolution of the diaphragm is the first resolution, the control unit controls at least one of gain and accumulation time and the diaphragm based on the first program diagram. The imaging device described in 1. The imaging apparatus has storage means for storing the generated program diagram,
The control means stores the generated second program diagram in the storage means in association with the ID of the interchangeable lens when the minimum resolution of the aperture of the mounted interchangeable lens is the second resolution, and the same When an ID interchangeable lens is mounted again, at least one of gain and accumulation time and an aperture are controlled based on the second program diagram stored in association with the ID. Item 5. The imaging device according to Item 3 or 4.   The control means transmits the aperture control signal to the interchangeable lens based on the information on the time when the minimum resolution of the aperture of the interchangeable lens mounted is the second resolution. The imaging device according to any one of 1 to 5.   When the ID of the mounted interchangeable lens cannot be acquired, the control means notifies a warning and controls at least one of gain and accumulation time and the diaphragm based on the first program diagram. The imaging apparatus according to any one of claims 3 to 6, wherein the imaging apparatus is characterized.   When the control unit cannot acquire the ID of the mounted interchangeable lens, the control unit transmits a signal instructing driving of the diaphragm to the interchangeable lens, and transmits the incident light amount to the image capturing unit and the signal. In the process of measuring the elapsed time from the time when the driving amount of the diaphragm driven until the incident light amount changes is a second driving amount larger than the first driving amount, The gain or the accumulation time is changed so as to complement the amount of change in the incident light amount corresponding to the second drive amount while the stop is stopped, and the aperture is adjusted based on the time required until the incident light amount changes. A third program diagram in which control of at least one of the gain and the accumulation time is changed so as to reset the luminance change due to the gain or the accumulation time change at the driving timing is created, At least one of gain or storage time on the basis of the program diagram, and an image pickup apparatus according to any one of claims 3 to 6, characterized in that controlling the throttle.   When the control unit cannot acquire the ID of the mounted interchangeable lens, the control unit transmits a signal instructing driving of the diaphragm to the interchangeable lens, and transmits the incident light amount to the image capturing unit and the signal. And when the drive amount of the diaphragm driven until the incident light quantity changes is the first drive amount, at least one of gain and accumulation time based on the first program diagram, The imaging apparatus according to claim 8, wherein the image pickup apparatus controls an aperture and an aperture.   When the control unit cannot acquire the ID of the mounted interchangeable lens, the control unit transmits a signal instructing driving of the diaphragm to the interchangeable lens, and transmits the incident light amount to the image capturing unit and the signal. And when the driving amount of the diaphragm driven until the incident light amount changes is the second driving amount, based on the information about the time required until the incident light amount changes, The imaging apparatus according to claim 8 or 9, wherein the aperture control signal is transmitted to an interchangeable lens.

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