JP2019095806A - Imaging apparatus and interchangeable lens - Google Patents

Abstract

To provide an imaging apparatus capable of excellently photographing an image.SOLUTION: The imaging apparatus includes an imaging part which captures the image by an optical system having a diaphragm, a detection part which detects a deviation amount between a focusing position where the image by the optical system is focused and the imaging part on the basis of a signal outputted from the imaging part, and a control part which controls the diaphragm value of the diaphragm. The control part controls a second diaphragm value during performing imaging by the imaging part, for the detection part to detect the deviation amount to a first diaphragm value, when the first diaphragm value during performing imaging by the imaging part, to record the signal as image data is a first threshold or less.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an imaging device and an interchangeable lens.

  2. Description of the Related Art Conventionally, there has been known an image pickup apparatus which detects a focus state of an optical system by detecting a shift amount of an image plane of an optical system based on an output of focus detection pixels provided in an image pickup device. As such an imaging device, for example, in order to prevent occurrence of vignetting when performing focus detection, the aperture value of the optical system is set to a value smaller than a predetermined aperture value (value on the open side), A method for performing focus detection is known (e.g., Patent Document 1).

JP, 2010-217618, A

  However, in the prior art, when the aperture value of the optical system is changed from the aperture value at the time of focus detection to the imaging aperture value in order to capture an image in real time, the image plane of the optical system As a result, there was a case where it was not possible to shoot an image in which the subject was in focus.

  The problem to be solved by the present invention is to provide an imaging device or an interchangeable lens capable of capturing an image well.

  The present invention solves the above-mentioned subject by the following solution means. Although the following description will be made with reference to the reference numerals corresponding to the drawings showing the embodiments of the present invention, these reference numerals are for the purpose of facilitating the understanding of the present invention and are not intended to limit the present invention. .

[1] An image pickup apparatus according to the present invention is an image pickup section for picking up an image by an optical system having a diaphragm and outputting a signal, and an image by the optical system being focused based on a signal outputted from the image pickup section. A detection unit that detects an amount of deviation between the focusing position and the imaging unit; and a control unit that controls the aperture value of the aperture, the control unit recording the signal as image data. When the first aperture value during imaging by the imaging unit is less than or equal to the first threshold value, the second aperture value during imaging by the imaging unit is detected by the first aperture so that the detection unit detects the amount of displacement. Control to value.
[2] In the invention according to the imaging device, the control unit can be configured to control the second aperture value to the first threshold value when the first aperture value is larger than the first threshold value.
[3] In the invention according to the imaging device, the control unit controls the second aperture value to the first aperture value when the first aperture value is equal to or greater than a second threshold value smaller than the first threshold value. It can be configured as
[4] In the invention relating to the imaging device, the control unit may set the first aperture value or less, the second threshold value, or the second threshold value when the image based on the signal does not have a proper exposure when the first aperture value is larger than the first threshold. It can be configured to control the second aperture value in the range above the threshold value.
[5] In the invention according to the above-mentioned imaging device, the control unit is configured to set the first aperture value to a value equal to or less than the first threshold and equal to or more than the second threshold, and the image based on the signal is not properly exposed. The second aperture value can be controlled within a range of 1 aperture value or less and the second threshold value or more.
[6] In the invention according to the imaging device, the control unit can be configured to control the second aperture value to the first aperture value when the first aperture value is equal to or less than the second threshold.
[7] In the invention relating to the imaging device described above, it can be configured to include a mounting unit to which the interchangeable lens having the optical system can be mounted, and a storage unit that stores the second threshold for each interchangeable lens.
[8] In the invention relating to the above imaging apparatus, the information on the second threshold value is provided from the mounting unit on which the interchangeable lens having the optical system and the storage unit storing the second threshold can be mounted, and the interchangeable lens. And a receiving unit for receiving.
[9] The interchangeable lens according to the present invention is an interchangeable lens that can be mounted on the above-described imaging device, and the imaging device is the optical system, a storage unit that stores the second threshold, and information of the second threshold. And a transmitter for transmitting the

  According to the present invention, an image can be captured well.

FIG. 1 is a block diagram showing a camera according to the present embodiment. FIG. 2 is a front view showing a focus detection position on the imaging surface of the imaging device shown in FIG. FIG. 3 is a front view schematically showing an arrangement of the focus detection pixels 222a and 222b by enlarging a portion III of FIG. FIG. 4 is a front view showing one of the imaging pixels 221 in an enlarged manner. FIG. 5A is an enlarged front view showing one of the focus detection pixels 222a, and FIG. 5B is an enlarged front view showing one of the focus detection pixels 222b. FIG. 6 is a cross-sectional view showing one of the imaging pixels 221 in an enlarged manner. FIG. 7A is an enlarged sectional view showing one of the focus detection pixels 222a, and FIG. 7B is an enlarged sectional view showing one of the focus detection pixels 222b. FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 9 is a flowchart showing the operation of the camera according to the present embodiment. FIG. 10 is a diagram showing an example of the relationship between the aperture value at the time of focus detection set in the present embodiment and the imaging aperture value. FIG. 11 is a flowchart showing the scan operation execution process of step S118.

  Hereinafter, embodiments of the present invention will be described based on the drawings.

  FIG. 1 is a main part configuration diagram showing a digital camera 1 according to an embodiment of the present invention. The digital camera 1 (hereinafter simply referred to as the camera 1) of the present embodiment is composed of a camera body 2 and a lens barrel 3, and the camera body 2 and the lens barrel 3 are detachably coupled by a mount unit 4 There is.

  The lens barrel 3 is an interchangeable lens that is detachable from the camera body 2. As shown in FIG. 1, the lens barrel 3 incorporates a photographing optical system including lenses 31, 32, 33 and a diaphragm 34.

  The lens 32 is a focus lens, and can move in the direction of the optical axis L1 to adjust the focal length of the imaging optical system. The focus lens 32 is provided so as to be movable along the optical axis L1 of the lens barrel 3, and its position is adjusted by the focus lens drive motor 36 while its position is detected by the encoder 35.

  The specific configuration of the moving mechanism along the optical axis L1 of the focus lens 32 is not particularly limited. For example, a rotary cylinder is rotatably inserted into a fixed cylinder fixed to the lens barrel 3, and a helicoid groove (helical groove) is formed on the inner peripheral surface of the rotary cylinder, and the focus lens 32 is fixed. The end of the lens frame is fitted in the helicoid groove. Then, by rotating the rotary cylinder by the focus lens drive motor 36, the focus lens 32 fixed to the lens frame moves rectilinearly along the optical axis L1.

  As described above, the focus lens 32 fixed to the lens frame moves rectilinearly in the direction of the optical axis L1 by rotating the rotary cylinder with respect to the lens barrel 3, but the focus lens drive motor 36 as its drive source is a lens The lens barrel 3 is provided. The focus lens drive motor 36 and the rotary cylinder are connected by, for example, a transmission composed of a plurality of gears, and when the drive shaft of the focus lens drive motor 36 is rotationally driven in either direction, it is transmitted to the rotary cylinder with a predetermined gear ratio. Then, when the rotary cylinder rotates in any one direction, the focus lens 32 fixed to the lens frame moves rectilinearly in any direction of the optical axis L1. When the drive shaft of the focus lens drive motor 36 is driven to rotate in the reverse direction, the gears constituting the transmission also rotate in the reverse direction, and the focus lens 32 moves rectilinearly in the direction opposite to the optical axis L1. .

  The position of the focus lens 32 is detected by the encoder 35. As described above, the position of the focus lens 32 in the direction of the optical axis L1 is correlated with the rotation angle of the rotary cylinder, and therefore can be determined by detecting the relative rotation angle of the rotary cylinder with respect to the lens barrel 3, for example.

  The encoder 35 according to the present embodiment detects a rotation of a rotating disk connected to the rotational drive of the rotating cylinder by an optical sensor such as a photo interrupter and outputs a pulse signal according to the number of rotations, or a fixed cylinder The encoder contacts on the surface of the flexible printed wiring board provided on either one of the rotating cylinder and the brush contact on the other are brought into contact with each other, and the moving amount of the rotating cylinder (in either the rotational direction or the optical axis direction) It is possible to use one that detects a change in the contact position according to (a) by a detection circuit.

  The focus lens 32 can move in the direction of the optical axis L1 from the end on the camera body side (also referred to as the near end) to the end on the subject side (also referred to as the infinite end) by rotation of the rotary cylinder described above. it can. Incidentally, the current position information of the focus lens 32 detected by the encoder 35 is sent to the camera control unit 21 described later via the lens control unit 37, and the focus lens drive motor 36 calculates the focus based on this information. The drive position of the lens 32 is driven by being sent from the camera control unit 21 via the lens control unit 37.

  The aperture 34 is configured to adjust the aperture diameter centered on the optical axis L1 in order to limit the light amount of the light flux passing through the imaging optical system and reaching the imaging device 22 and to adjust the blur amount. Adjustment of the aperture diameter by the aperture stop 34 is performed, for example, by transmitting the aperture diameter according to the aperture value calculated in the automatic exposure mode from the camera control unit 21 via the lens control unit 37. Further, the aperture diameter corresponding to the set photographing aperture value is input from the camera control unit 21 to the lens control unit 37 by manual operation by the operation unit 28 provided in the camera body 2. The aperture diameter of the diaphragm 34 is detected by a diaphragm aperture sensor (not shown), and the lens controller 37 recognizes the current aperture diameter.

  On the other hand, in the camera body 2, an imaging element 22 for receiving the light flux L1 from the imaging optical system is provided on a planned focal plane of the imaging optical system, and a shutter 23 is provided on the front surface thereof. The imaging device 22 is configured of a device such as a CCD or a CMOS, converts the received light signal into an electric signal, and sends it to the camera control unit 21. The photographed image information sent to the camera control unit 21 is sequentially sent to the liquid crystal drive circuit 25 and displayed on the electronic viewfinder (EVF) 26 of the observation optical system, and the release button (provided in the operation unit 28) When the full depression (not shown) is performed, the photographed image information is recorded in the memory 24 which is a recording medium. The memory 24 can use any of a removable card type memory and a built-in type memory. An infrared cut filter for cutting infrared light and an optical low pass filter for preventing aliasing noise of an image are disposed in front of the imaging surface of the image sensor 22. Details of the structure of the imaging device 22 will be described later.

  A camera control unit 21 is provided in the camera body 2. The camera control unit 21 is electrically connected to the lens control unit 37 by the electric signal contact unit 41 provided in the mount unit 4, receives lens information from the lens control unit 37, and defocuses the lens control unit 37. Send information such as the amount and aperture diameter. In addition, as described above, the camera control unit 21 reads out the pixel output from the imaging device 22 and generates image information by performing predetermined information processing on the read out pixel output as necessary, and the generated image information Are output to the liquid crystal drive circuit 25 and the memory 24 of the electronic viewfinder 26. Further, the camera control unit 21 controls the entire camera 1 such as correction of image information from the image pickup device 22 and detection of a focusing state of the lens barrel 3, an aperture adjusting state, and the like.

  Further, in addition to the above, the camera control unit 21 detects the focus state of the photographing optical system by the phase detection method based on the pixel data read from the imaging device 22 and detects the focus state of the optical system by the contrast detection method. Do. In addition, the detection method of a focus state is mentioned later.

  In addition, when performing focus detection, the camera control unit 21 stores in advance in the memory 29 the limit value on the stop side of the aperture value of the optical system as the stop side limit value. When the focus detection is performed, this narrowing-side limit value is, for example, the narrowing-side value among aperture values that can effectively prevent occurrence of vignetting and can obtain good focus detection accuracy. be able to.

  Furthermore, the camera control unit 21 sets the open limit value of the aperture value of the optical system to the memory 29 as the open limit value when detecting the focus state of the optical system for each type of lens barrel 3. It is stored in advance. Here, for example, when the f-number at the time of detecting the focus state of the optical system is F1.4 and the shooting f-number at the time of main photographing of the image is F2.8, the main photographing is performed after focus detection. When the f-number of the optical system is changed from f / 1.4 which is the f-number at the time of focus detection to F2.8 which is the photographing f-number, movement of the image plane of the optical system accompanying the change of the f-number. As a result, the in-focus position detected at the time of focus detection deviates from the depth of field of the optical system at the time of main shooting of the image, and an image in focus on the object in focus at the time of focus detection can not be shot There is a case. In particular, this tendency becomes greater as the aperture value of the optical system becomes a value on the open side. Therefore, in such a case, for example, by limiting the aperture value at the time of detecting the focus state of the optical system to F 1.4 so as not to be F 1.4, the image plane movement amount accompanying the change of the aperture value Even when the f-number of the optical system is changed from the f-number at the time of detecting the focus state to the photographing f-number, it is possible to capture an image in focus on the subject. In this way, even when the aperture value of the optical system is changed from the aperture value at the time of focus detection to the imaging aperture value, the open-side limit value can be used to successfully capture an image. The limit value on the side is determined according to the type of lens barrel 3.

  Further, in the present embodiment, the camera control unit 21 stores the open side limit value as the number of aperture steps from the open aperture value. For example, when the open limit value is F2 as the f-number (F value), the open f-number is F1.2 and the f-number of the optical system is changed from the open f-number F1.2 to the open-end limit value. When the number of stages of the diaphragm 34 for changing to a certain F2 is two, the camera control unit 21 stores the open side limit value as two stages. Thus, by storing the open-side limit value as the number of aperture steps from the open aperture value, for example, even when the lens position of the zoom lens is changed, the open aperture value according to the lens position of the zoom lens The open-side limit value corresponding to the lens position of the zoom lens can be obtained based on the above, and it is not necessary to store the open aperture value for each lens position of the zoom lens. The above-described open aperture value, open side limit value, and aperture stage number are merely examples, and the present invention is not limited to these values.

  Then, the camera control unit 21 controls the exposure at the time of focus detection based on the open-side limit value and the narrow-down side limit value stored in the memory 29. The details of the exposure control at the time of focus detection will be described later.

  The operation unit 28 is a shutter release button and an input switch for the photographer to set various operation modes of the camera 1 and can switch between an auto focus mode and a manual focus mode. The various modes set by the operation unit 28 are sent to the camera control unit 21, and the operation of the entire camera 1 is controlled by the camera control unit 21. Further, the shutter release button includes a first switch SW1 which is turned on when the button is half pressed, and a second switch SW2 which is turned on when the button is fully pressed.

  Next, the image sensor 22 according to the present embodiment will be described.

  FIG. 2 is a front view showing the imaging surface of the imaging device 22, and FIG. 3 is a front view schematically showing the arrangement of the focus detection pixels 222a and 222b by enlarging a portion III of FIG.

  As shown in FIG. 3, in the imaging device 22 of the present embodiment, a plurality of imaging pixels 221 are two-dimensionally arranged on a plane of an imaging surface, and a green pixel G having a color filter transmitting a green wavelength region And a red pixel R having a color filter transmitting the red wavelength region and a blue pixel B having a color filter transmitting the blue wavelength region are what is called a Bayer arrangement. That is, two green pixels are arranged on one diagonal line in adjacent four pixel groups 223 (a dense square lattice array), and one red pixel and one blue pixel are arranged on the other diagonal line. The imaging element 22 is configured by repeatedly arranging the pixel group 223 two-dimensionally on the imaging surface of the imaging element 22 in units of the pixel group 223 in which the Bayer arrangement is performed.

  The arrangement of the unit pixel groups 223 may be, for example, a close hexagonal lattice arrangement, as well as the close square lattice shown in the drawing. Further, the configuration and arrangement of the color filter are not limited to this, and an arrangement of complementary color filters (green: G, yellow: Ye, magenta: Mg, cyan: Cy) can also be adopted.

  FIG. 4 is an enlarged front view showing one of the imaging pixels 221, and FIG. 6 is a sectional view. One imaging pixel 221 includes a microlens 2211, a photoelectric conversion unit 2212, and a color filter (not shown), and as shown in the cross-sectional view of FIG. 6, the photoelectric conversion unit is formed on the surface of the semiconductor circuit substrate 2213 of the imaging device 22. 2212 is fabricated, and a microlens 2211 is formed on the surface. The photoelectric conversion unit 2212 is shaped so as to receive the imaging light flux passing through the exit pupil (for example, F1.0) of the imaging optical system by the microlens 2211 and receives the imaging light flux.

  In addition, focus detection pixel arrays 22a, 22b, and 22c in which focus detection pixels 222a and 222b are arranged instead of the imaging pixels 221 described above at the center of the imaging surface of the imaging element 22 and at three positions symmetrical with respect to the center. Is provided. Then, as shown in FIG. 3, in one focus detection pixel row, a plurality of focus detection pixels 222a and 222b are arranged adjacent to each other and alternately arranged in one horizontal row (22a, 22c, 22c). There is. In the present embodiment, the focus detection pixels 222a and 222b are densely arranged without providing a gap at the positions of the green pixel G and the blue pixel B of the imaging pixel 221 in Bayer arrangement.

  The positions of the focus detection pixel arrays 22a to 22c shown in FIG. 2 are not limited to the illustrated positions, but may be one or two, or may be disposed at four or more positions. it can. Further, at the time of actual focus detection, the photographer selects a desired focus detection pixel row as a focus detection position by manually operating the operation unit 28 from among the plurality of arranged focus detection pixel rows 22a to 22c. It can also be done.

  FIG. 5A is an enlarged front view of one of the focus detection pixels 222a, and FIG. 7A is a cross-sectional view of the focus detection pixel 222a. 5B is an enlarged front view showing one of the focus detection pixels 222b, and FIG. 7B is a cross-sectional view of the focus detection pixel 222b. The focus detection pixel 222a includes a micro lens 2221a and a semicircular photoelectric conversion unit 2222a as shown in FIG. 5A, and as shown in the cross sectional view of FIG. The photoelectric conversion portion 2222a is formed on the surface of the semiconductor circuit substrate 2213, and the micro lens 2221a is formed on the surface. Further, as shown in FIG. 5B, the focus detection pixel 222b is composed of a micro lens 2221b and a photoelectric conversion unit 2222b, and as shown in the cross sectional view of FIG. 7B, the semiconductor of the imaging device 22 is The photoelectric conversion portion 2222b is formed on the surface of the circuit board 2213, and the micro lens 2221b is formed on the surface. The focus detection pixels 222a and 222b are arranged adjacent to each other and alternately in a horizontal row, as shown in FIG. 3, to form the focus detection pixel rows 22a to 22c shown in FIG.

  The photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b have shapes that receive light beams passing through a predetermined area (for example, F2.8) of the exit pupil of the photographing optical system by the micro lenses 2221a and 2221b. Be done. Further, no color filter is provided in the focus detection pixels 222a and 222b, and the spectral characteristics thereof are obtained by integrating the spectral characteristics of the photodiode performing photoelectric conversion and the spectral characteristics of the infrared cut filter (not shown). ing. However, one of the same color filters as the imaging pixel 221, for example, a green filter may be provided.

  Although the photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b shown in FIGS. 5A and 5B are semicircular, the shape of the photoelectric conversion units 2222a and 2222b is not limited thereto. And other shapes, for example, an oval shape, a rectangular shape, and a polygonal shape.

  Here, a so-called phase difference detection method for detecting the focus state of the photographing optical system based on the pixel outputs of the focus detection pixels 222a and 222b described above will be described.

  FIG. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. 3 and is disposed in the vicinity of the photographing optical axis L1 and the focus detection pixels 222a-1, 222b-1, 222a-2, 222b-2 adjacent to each other are It shows that light beams AB1-1, AB2-1, AB1-2, and AB2-2 emitted from the focusing pupils 351 and 352 of the exit pupil 350 are respectively received. Although FIG. 8 illustrates only one of the plurality of focus detection pixels 222a and 222b located in the vicinity of the photographing optical axis L1, other focus detection pixels other than the focus detection pixels shown in FIG. 8 are shown. Similarly, the light beams emitted from the pair of distance measuring pupils 351 and 352 are also received.

  Here, the exit pupil 350 is an image set at the position of the distance D in front of the microlenses 2221 a and 2221 b of the focus detection pixels 222 a and 222 b disposed on the planned focal plane of the imaging optical system. The distance D is a value uniquely determined according to the curvature of the micro lens, the refractive index, the distance between the micro lens and the photoelectric conversion part, and the like, and this distance D is referred to as a distance measurement pupil distance. Further, the ranging pupils 351 and 352 refer to images of the photoelectric conversion units 2222a and 2222b respectively projected by the micro lenses 2221a and 2221b of the focus detection pixels 222a and 222b.

  In FIG. 8, the arrangement direction of the focus detection pixels 222 a-1, 222 b-1, 222 a-2 and 222 b-2 coincides with the arrangement direction of the pair of distance measurement pupils 351 and 352.

  Further, as shown in FIG. 8, the microlenses 2221a-1, 2221b-1, 2221a-2, 2221b-2 of the focus detection pixels 222a-1, 222b-1, 222a-2, 222b-2 have a photographing optical system. It is placed near the planned focal plane of. The shape of each of the photoelectric conversion units 2222a-1, 2222b-1, 2222a-2, 2222b-2 disposed behind the microlenses 2221a-1, 2221b-1, 2221a-2, 2221b-2 is The light is projected onto the exit pupil 350 separated by the distance measurement distance D from the lenses 2221a-1 and 2221b-1, and 2221a-2 and 2221b-2, and the projected shapes form distance measurement pupils 351 and 352.

  That is, on the exit pupil 350 located at the distance measurement distance D, the microlenses and photoelectric conversion units in each focus detection pixel are matched so that the projection shapes (distance measurement pupils 351, 352) of the photoelectric conversion units of each focus detection pixel match. The relative positional relationship of is determined, whereby the projection direction of the photoelectric conversion unit at each focus detection pixel is determined.

  As shown in FIG. 8, the photoelectric conversion unit 2222a-1 of the focus detection pixel 222a-1 is formed on the microlens 2221a-1 by the light beam AB1-1 which passes through the distance measurement pupil 351 and is directed to the microlens 2221a-1. Output a signal corresponding to the intensity of the image being Similarly, the photoelectric conversion unit 2222a-2 of the focus detection pixel 222a-2 passes through the distance measurement pupil 351, and the intensity of the image formed on the microlens 2221a-2 by the light beam AB1-2 directed to the microlens 2221a-2. Output a signal corresponding to

  In addition, the photoelectric conversion unit 2222b-1 of the focus detection pixel 222b-1 passes through the distance measurement pupil 352, and the intensity of the image formed on the microlens 2221b-1 by the light beam AB2-1 directed to the microlens 2221b-1 Output the corresponding signal. Similarly, the photoelectric conversion unit 2222b-2 of the focus detection pixel 222b-2 passes through the distance measurement pupil 352, and the intensity of the image formed on the microlens 2221b-2 by the light beam AB2-2 directed to the microlens 2221b-2. Output a signal corresponding to

  Then, a plurality of the two types of focus detection pixels 222a and 222b described above are linearly arranged as shown in FIG. 3, and the output of the photoelectric conversion units 2222a and 2222b of each focus detection pixel 222a By combining the output groups corresponding to each of the focus detection pupils 352 and the focus detection pupil 352, the intensities of a pair of images formed on the focus detection pixel array by the focus detection light beams passing through the focus detection pupil 351 and the focus detection pupil 352, respectively. Data on the distribution is obtained. Then, by performing image shift detection calculation processing such as correlation calculation processing or phase difference detection processing on the intensity distribution data, it is possible to detect an image shift amount by a so-called phase difference detection method.

  Then, a conversion operation according to the distance between the center of gravity of the pair of distance measuring pupils is performed on the obtained image shift amount to obtain the current focal plane with respect to the planned focal plane (the focal point corresponding to the position of the microlens array on the planned focal plane) The deviation of the focal plane in the detection area can be determined.

  The calculation of the image shift amount by the phase difference detection method and the calculation of the defocus amount based on this are executed by the camera control unit 21.

  Further, the camera control unit 21 reads the output of the imaging pixel 221 of the imaging element 22, and calculates the focus evaluation value based on the read pixel output. The focus evaluation value can be obtained, for example, by extracting the high frequency component of the image output from the imaging pixel 221 of the imaging device 22 using a high frequency transmission filter. It can also be determined by extracting high frequency components using two high frequency transmission filters having different cutoff frequencies.

  Then, the camera control unit 21 sends a control signal to the lens control unit 37 to drive the focus lens 32 at a predetermined sampling interval (distance) to obtain a focus evaluation value at each position, and the focus evaluation value is maximum. The focus detection by the contrast detection method is performed to obtain the position of the focus lens 32 as the in-focus position. It should be noted that, for example, when the focus evaluation value is calculated while driving the focus lens 32, the in-focus position is further lowered twice after the focus evaluation value rises twice. It can obtain | require by performing calculations, such as an interpolation method, using the focus evaluation value of.

  Next, an operation example of the camera 1 according to the present embodiment will be described. FIG. 9 is a flowchart showing an operation example of the camera 1 according to the present embodiment. The following operation is started when the power of the camera 1 is turned on.

  First, in step S101, the camera control unit 21 acquires the open-side limit value corresponding to the type of the lens barrel 3. The method of acquiring the open side limit value corresponding to the type of the lens barrel 3 is not particularly limited. For example, the camera control unit 21 controls the lens identification information for identifying the type of the lens barrel 3 as lens control The type of the lens barrel 3 is identified based on the lens identification information acquired from the unit 37 and acquired. Then, the camera control unit 21 can acquire the open side limit value corresponding to the identified type of the lens barrel 3 from the memory 29. In the present embodiment, since the open limit value is stored in the memory 29 as the number of steps from the open aperture, the camera control unit 21 sets the open aperture and the number of steps from the open aperture. Based on the open-side limit value (F value) of the aperture value of the optical system at the time of focus detection, the open-side limit value is determined.

  In step S102, the camera control unit 21 acquires, from the memory 29, the limit value on the stop side of the aperture value of the optical system at the time of detecting the focus state of the optical system as the stop side limit value.

  Then, in step S103, the camera control unit 21 performs focus detection on the aperture value (F value) of the optical system based on the open side limit value acquired in step S101 and the narrowing side limit value acquired in step S102. Processing is performed to set the aperture value for performing. Specifically, the camera control unit 21 narrows down the aperture value of the optical system when the shooting aperture value set for the main shooting of the image is a value on the narrowing side rather than the narrowing limit value. Set to the side limit value. Here, FIG. 10 is a diagram showing an example of the relationship between the aperture value set to perform focus detection and the imaging aperture value. In the example shown in FIG. 10, in the lens barrel 3 in which the open aperture value is F1.2 and the maximum aperture value (maximum F value) is F16, the open side limit value is acquired as F2.8, and the narrowing side It shows a scene where the limit value is obtained as F5.6. For example, in (A) of FIG. 10, since the imaging aperture value is set to F16 and the imaging aperture value F16 is a value on the narrowing side rather than the narrowing limit value F5.6, the camera control is performed. The unit 21 sets the aperture value of the optical system to F5.6, which is the stop side limit value. Further, in FIG. 10B, since the imaging aperture value is F8, the camera control unit 21 sets the aperture value of the optical system to F5. Set to 6.

  In addition, when the shooting aperture value set for the main shooting of the image is the same value as the narrowing-down limit value or a value on the open side more than the narrow-down limit, the camera control unit 21 Set the aperture to the shooting aperture. For example, in (C) of FIG. 10, since the shooting aperture value is F5.6, which is the same as the stop-side limit value, the camera control unit 21 sets the aperture value of the optical system to F5.6, which is the shooting aperture value. Do. Further, in FIG. 10D, since the shooting aperture value is set to F4 and the shooting aperture value F4 is a value more on the open side than F5.6, which is the narrowing-down limit value, camera control is performed. The unit 21 sets the aperture value of the optical system to F4, which is a shooting aperture value. Similarly, in (E) to (G) in FIG. 10, as in the case of (D) in FIG. 10, since the shooting aperture value is an open side value more than the narrowing limit value, the camera control unit 21 Set the aperture of the optical system to the shooting aperture.

  In step S104, the camera control unit 21 divides the shooting screen into a plurality of areas, performs multi-division photometry (multi-pattern photometry) that performs photometry for each divided area, and calculates the luminance value Bv of the entire shooting screen. Be done. Then, at least one of the light reception sensitivity Sv and the exposure time Tv is changed by the camera control unit 21 based on the calculated luminance value Bv of the entire photographing screen so that the appropriate exposure can be obtained over the entire photographing screen. In step S104, at least one of the light receiving sensitivity Sv and the exposure time Tv is changed while the aperture Av corresponding to the aperture value set in step S103 is fixed. Then, based on the changed light receiving sensitivity Sv and exposure time Tv, for example, the shutter speed of the shutter 23, the sensitivity of the imaging device 21 and the like are set to control the exposure of the imaging device 22.

  In step S105, the camera control unit 21 determines whether or not the proper exposure has been obtained over the entire photographing screen by the exposure control in step S104. If the entire photographed screen does not have a proper exposure only by changing the light receiving sensitivity Sv or the exposure time Tv, the process proceeds to step S106, while changing at least one of the light receiving sensitivity Sv and the exposure time Tv If the appropriate exposure is obtained overall, the process proceeds to step S108.

  In step S106, it is determined that the proper exposure can not be obtained over the entire shooting screen only by changing the light reception sensitivity Sv and the exposure time Tv. Therefore, the camera control unit 21 changes the aperture Av. Specifically, when the shooting aperture value is a value on the narrowing side rather than the narrowing-side limit value, the camera control unit 21 determines that the aperture value of the optical system is the open-side limit value and the narrowing-side limit value. The aperture Av is changed based on the luminance value Bv of the entire shooting screen so as to be within the range. For example, in (A) of FIG. 10, since the imaging aperture value F16 is a value on the narrowing side rather than the narrowing limit value F5.6, the camera control unit 21 sets the aperture value of the optical system to The aperture Av is changed so as to be within the range from F2.8, which is the open side limit value, to F5.6, which is the narrowing down side limit value, and exposure control is performed so as to obtain appropriate exposure over the entire shooting screen. The same applies to (B) of FIG.

  Further, when the shooting aperture value is the same value as the narrowing limit value or a value on the opening side more than the narrowing limit value, the camera control unit 21 sets the aperture value of the optical system to the open limit value and shooting. The aperture Av is changed based on the luminance value Bv of the entire shooting screen so as to be within the range with the aperture value. For example, in (C) of FIG. 10, since the shooting aperture value F5.6 is the same value as F5.6 which is the narrowing-down limit value, the camera control unit 21 sets the aperture value of the optical system open. The aperture Av is changed so as to be within the range from the side limit value F2.8 to the shooting aperture value F5.6. Further, in (D) of FIG. 10, since the photographing aperture value F4 is a value more on the open side than F5.6, which is the narrowing limit value, the camera control unit 21 sets the aperture value of the optical system to The aperture Av is changed so as to be within the range from F2.8, which is the open side limit value, to F4, which is the shooting aperture value.

  When the shooting aperture value is the same as the opening limit value or a value on the opening side more than the opening limit value, the camera control unit 21 assumes that the aperture value of the optical system remains the shooting aperture value. Do. For example, in (E) of FIG. 10, since the imaging aperture value F2.8 is the same value as the open side limit value F2.8, the camera control unit 21 captures the aperture value of the optical system. Leave the aperture value at F2.8. The same applies to (F) to (G) in FIG. Further, in the present embodiment, for example, as shown in (A) to (D) of FIG. 10, the camera control unit 21 can change the aperture Av within the range of a predetermined aperture value. Even when the luminance value Bv of the entire photographing screen changes again, the diaphragm Av is changed slightly to the open side with some margin so that the diaphragm Av need not be changed again.

  In step S107, the light reception sensitivity Sv and the exposure time Tv are determined by the camera control unit 21 so that the appropriate exposure can be obtained over the entire shooting screen with the aperture Av changed in step S106. Specifically, as in step S104, the camera control unit 21 performs multi-pattern photometry on the entire shooting screen, and calculates the luminance value Bv of the entire shooting screen. Then, based on the calculated brightness value Bv and the aperture Av changed in step S106, the camera control unit 21 determines and determines the light reception sensitivity Sv and the exposure time Tv at which the appropriate exposure can be obtained over the entire shooting screen. The exposure to the image sensor 22 is controlled based on the light receiving sensitivity Sv and the exposure time Tv, and the aperture Av changed in step S106.

  Then, in step S108, the camera control unit 21 performs calculation processing of the defocus amount by the phase difference detection method. Specifically, first, light reception from the optical system is performed by the imaging device 22, and each focus detection pixel 222 a constituting the three focus detection pixel arrays 22 a to 22 c of the imaging device 22 by the camera control unit 21. , 222b to read a pair of image data corresponding to the pair of images. In this case, when a specific focus detection position is selected by the manual operation of the photographer, only data from focus detection pixels corresponding to the focus detection position may be read out. Then, the camera control unit 21 executes image shift detection calculation processing (correlation calculation processing) based on the read pair of image data, and images at focus detection positions corresponding to the three focus detection pixel arrays 22a to 22c. The shift amount is calculated, and the image shift amount is converted into the defocus amount. The camera control unit 21 also evaluates the reliability of the calculated defocus amount. For example, the camera control unit 21 can determine the reliability of the defocus amount based on the degree of coincidence or contrast of the pair of image data.

  In step S109, the camera control unit 21 determines whether the shutter release button provided on the operation unit 28 has been half-pressed (the first switch SW1 is turned on). If the shutter release button has been half-pressed, the process proceeds to step S110. On the other hand, when the shutter release button is not half-pressed, the process returns to step S104, and exposure control and calculation of the defocus amount are repeatedly executed until the shutter release button is half-pressed.

  In step S110, the camera control unit 21 determines whether the defocus amount has been calculated by the phase difference detection method. If the defocus amount can be calculated, it is determined that distance measurement is possible, and the process proceeds to step S111. If the defocus amount can not be calculated, it is determined that the distance measurement is not possible, and the process proceeds to step S115. . In the present embodiment, even if the defocus amount can be calculated, if the reliability of the calculated defocus amount is low, the defocus amount can not be calculated and the process proceeds to step S115. To be. In the present embodiment, for example, it is determined that the reliability of the defocus amount is low when the contrast of the subject is low, when the subject is an ultra-low-brightness subject, or when the subject is an ultra-high-brightness subject, .

  In step S111, the camera control unit 21 calculates the lens driving amount necessary to drive the focus lens 32 to the in-focus position based on the defocus amount calculated in step S108. The lens drive amount is sent to the focus lens drive motor 36 via the lens control unit 37. As a result, the focus lens drive motor 36 drives the focus lens 32 based on the calculated lens drive amount.

  In step S112, the camera control unit 21 determines whether the shutter release button has been fully pressed (the second switch SW2 is turned on). If the second switch SW2 is on, the process proceeds to step S113. If the second switch SW2 is not on, the process returns to step S104.

  In step S113, in order to perform the main photographing of the image, the camera control unit 21 performs a process of setting the aperture value of the optical system to the photographing aperture value. For example, in (A) of FIG. 10, in order to capture an image, the camera control unit 21 sets the aperture value of the optical system to the aperture value at the time of focus detection. From the limiting value within the range of F5.6), the shooting aperture value is changed to F16. Similarly, also in the examples shown in (B) to (G) of FIG. 10, the aperture value of the optical system is changed from the aperture value for performing focus detection to the imaging aperture value for performing the main photographing of the image. Then, in the subsequent step S114, the image pickup device 22 performs the main photographing of the image with the aperture value set in step S113, and the image data of the photographed image is stored in the memory 24.

  On the other hand, if it is determined in step S110 that the defocus amount can not be calculated, the process proceeds to step S115 in order to obtain an exposure suitable for focus detection. In step S115, the camera control unit 21 performs exposure control for focus detection so as to obtain an exposure suitable for focus detection. Specifically, the camera control unit 21 performs spot photometry in a predetermined area including the focus detection areas (the focus detection pixel arrays 22a, 22b, and 22c shown in FIG. 2) based on the output of the imaging device 22, and The luminance value SpotBv in a predetermined area including the focus detection area is calculated. Then, the camera control unit 21 determines the light receiving sensitivity Sv, the exposure time Tv, and the like so that an exposure suitable for focus detection (for example, an exposure brighter than the appropriate exposure) can be obtained based on the calculated brightness value SpotBv. Determine the aperture Av. In the exposure control for focus detection in step S115, as in steps S104 to S107, the camera control unit 21 preferentially changes the light reception sensitivity Sv and the exposure time Tv to obtain the light reception sensitivity Sv and the exposure time Tv. The aperture Av is changed based on the open side limit value and the narrowing side limit value acquired in steps S101 and S102 only when the change is not sufficient to obtain an exposure suitable for focus detection. That is, as shown in (A) and (B) of FIG. 10, the camera control unit 21 controls the aperture of the optical system when the photographing aperture value is a value on the narrowing side rather than the narrowing limit value. The aperture Av is changed based on the luminance value SpotBv in a predetermined area including the focus detection area so that the value is within the range between the open-side limit value and the narrow-down side limit value. Further, as shown in (C) to (D) of FIG. 10, when the imaging aperture value is the same value as the narrowing limit value or a value on the opening side than the narrowing limit value, the aperture of the optical system The aperture Av is changed based on the luminance value SpotBv in the predetermined area including the focus detection area so that the value is within the range between the open-side limit value and the imaging aperture value, and further, (E) in FIG. As shown in (G), when the shooting aperture value is the same value as the opening limit value or a value closer to the opening limit than the opening limit value, the aperture value of the optical system remains the shooting aperture value. I assume.

  In step S116, the camera control unit 21 calculates the defocus amount based on the image data obtained by the exposure suitable for focus detection, and in the subsequent step S117, the camera control unit 21 is suitable for focus detection. Based on the image data obtained by the exposure, it is determined whether the defocus amount has been calculated. If the defocus amount can be calculated, the process proceeds to step S111, and drive processing of the focus lens 32 is performed based on the calculated defocus amount. On the other hand, when the defocus amount can not be calculated even if the image data obtained by the exposure suitable for focus detection is used, the process proceeds to step S118, and a scan operation execution process described later is performed. Also in step S117, as in step S110, even when the defocus amount can be calculated, if the reliability of the calculated defocus amount is low, the defocus amount can not be calculated. .

  In step S118, the camera control unit 21 performs a scan operation execution process for executing a scan operation. Here, with the scan operation, while the focus lens drive motor 36 scans and drives the focus lens 32, the camera control unit 21 determines the calculation of the defocus amount by the phase difference detection method and the calculation of the focus evaluation value. At the same time, the detection of the in-focus position by the phase difference detection method and the detection of the in-focus position by the contrast detection method are simultaneously performed at predetermined intervals. In the following, with reference to FIG. 11, a scan operation execution process according to the present embodiment will be described. FIG. 11 is a flowchart showing a scan operation execution process according to the present embodiment.

  First, in step S201, the camera control unit 21 performs processing for starting a scanning operation. Specifically, the camera control unit 21 sends a scan drive start command to the lens control unit 37, and the lens control unit 37 drives the focus lens drive motor 36 based on the command from the camera control unit 21 to perform focusing. The lens 32 is scan driven along the optical axis L1. The direction in which the scan drive is performed is not particularly limited, and the scan drive of the focus lens 32 may be performed from the infinite end to the close end, or even from the close end to the infinity end. Good.

  Then, while driving the focus lens 32, the camera control unit 21 reads out a pair of image data corresponding to the pair of images from the focus detection pixels 222a and 222b of the image sensor 22 at predetermined intervals. While the defocus amount is calculated and the reliability of the calculated defocus amount is evaluated by the phase difference detection method, the pixel output of the imaging pixel 221 of the imaging element 22 is performed at predetermined intervals while driving the focus lens 32. Based on this read out, the focus evaluation value is calculated, and the focus evaluation value at different focus lens positions is acquired, thereby detecting the in-focus position by the contrast detection method.

  In step S202, as a result of performing the scan operation, the camera control unit 21 determines whether the defocus amount has been calculated by the phase difference detection method. If the defocus amount can be calculated, it is determined that distance measurement is possible, and the process proceeds to step S205. On the other hand, if the defocus amount can not be calculated, it is determined that the distance measurement is not possible, and the process proceeds to step S203. .

  In step S203, as a result of performing the scan operation, the camera control unit 21 determines whether the in-focus position has been detected by the contrast detection method. If the in-focus position can be detected by the contrast detection method, the process proceeds to step S207. On the other hand, if the in-focus position can not be detected, the process proceeds to step S204.

  In step S204, the camera control unit 21 determines whether the scan operation has been performed on the entire drivable range of the focus lens 32 or not. When the scan operation is not performed for the entire drivable range of the focus lens 32, the process returns to step S202, and the steps S202 to S204 are repeated to perform the scan operation, that is, to drive the focus lens 32 while scanning. The operation of simultaneously executing the calculation of the defocus amount by the phase difference detection method and the detection of the in-focus position by the contrast detection method at predetermined intervals is continued. On the other hand, if execution of the scan operation has been completed for the entire drivable range of the focus lens 32, the process proceeds to step S208.

  When it is determined in step S202 that the defocus amount has been calculated by the phase difference detection method as a result of executing the scan operation, the process proceeds to step S205, and the phase difference detection method is calculated in step S205. A focusing operation is performed based on the defocus amount.

  That is, in step S205, after the stop processing of the scanning operation is first performed by the camera control unit 21, the lens drive necessary to drive the focus lens 32 to the in-focus position from the calculated defocus amount The amount is calculated, and the calculated lens driving amount is sent to the lens drive motor 36 via the lens control unit 37. Then, the lens drive motor 36 drives the focus lens 32 to the in-focus position based on the lens drive amount calculated by the camera control unit 21. When driving of the focus lens 32 to the in-focus position is completed, the process proceeds to step S206, and in step S206, the camera control unit 21 determines that the in-focus state is achieved.

  If it is determined in step S203 that the in-focus position has been detected by the contrast detection method as a result of performing the scan operation, the process proceeds to step S207, and based on the in-focus position detected by the contrast detection method The drive operation of the focus lens 32 is performed.

  That is, after the processing for stopping the scanning operation is performed by the camera control unit 21, the lens driving processing for driving the focus lens 32 to the in-focus position is performed based on the in-focus position detected by the contrast detection method. . When the drive of the focus lens 32 to the in-focus position is completed, the process proceeds to step S206, and the camera control unit 21 determines that the in-focus state is achieved.

  On the other hand, if it is determined in step S204 that the execution of the scan operation has been completed for the entire drivable range of the focus lens 32, the process proceeds to step S208. In step S208, as a result of performing the scan operation, focus detection can not be performed by any of the phase difference detection method and the contrast detection method, so the scan operation end processing is performed, and then in step S209. The process proceeds, and the camera control unit 21 determines that focusing is impossible.

  Then, after the scan operation execution process of step S118 is completed, the process proceeds to step S119, and it is determined by the camera control unit 21 whether or not the in-focus state is obtained based on the result of the in-focus determination in the scan operation execution process. To be done. In the scan operation execution process, when it is determined that the image is in focus (step S206), the process proceeds to step S112. On the other hand, if it is determined that the in-focus state can not be obtained (step S209), the process proceeds to step S120, and the in-focus state is displayed in step S120. The out-of-focus indication is performed, for example, by the electronic viewfinder 26.

  As described above, in the present embodiment, the open side limit value, which is the limit value on the open side of the aperture value of the optical system when performing focus detection, is stored in the memory of the camera body 2 for each type of lens barrel 3. The camera control unit 21 acquires from the memory 29 the open side limit value corresponding to the lens barrel 3 mounted on the camera body 2. Further, in the present embodiment, when the focus detection is performed, the narrowing-side limit value, which is the narrowing limit value of the aperture value of the optical system at the time of focus detection, is stored in the memory 29 of the camera body 2. , And the narrowing side limit value is acquired from the memory 29. Then, the camera control unit 21 sets the aperture value of the optical system at the time of focus detection based on the acquired open side limit value and narrowing side limit value. Specifically, when the shooting aperture value at the time of main imaging of the image is a value on the narrowing side rather than the narrowing limit value, the aperture value of the optical system at the time of focus detection is the open side limit value. It sets in the range of and the narrowing-down limit value. As described above, in the present embodiment, the aperture value of the optical system at the time of focus detection is limited to a value on the narrowing side rather than the open side limit value, so that the aperture of the optical system can be photographed. Even when the aperture value at focus detection is changed to the shooting aperture value for capturing an image, the movement amount of the image plane of the optical system accompanying the change of the aperture value of the optical system should be equal to or less than a predetermined value. As a result, the in-focus position detected in the focus detection can be made within the range of the depth of field of the optical system at the time of main photographing of the image, and the image in focus on the subject can be photographed. Can.

  Further, in the present embodiment, when the shooting aperture value at the time of main photographing of the image is a value on the narrowing side rather than the narrowing limit value, the aperture value of the optical system at the time of focus detection is the narrowing side. By limiting to the value on the open side rather than the limit value, the occurrence of vignetting at the time of focus detection can be effectively prevented, and the focus state of the optical system can be appropriately detected. Furthermore, in the present embodiment, when the shooting aperture value is a value on the open side more than the narrowing limit value, the aperture value of the optical system at the time of focus detection is the open side limit value and the shooting aperture value. By setting in the range of, the aperture value of the optical system at the time of performing focus detection is limited so as not to be a value on the side of reduction rather than the imaging aperture value, whereby the image is captured when the image is captured. The depth of field at the time of main shooting becomes shallower than the depth of field at the time of focus detection, and the subject focused at the time of focus detection at the time of main shooting of an image Deviation from the depth of field can be effectively prevented, and as a result, an image in focus on the subject can be photographed well.

  Furthermore, in the present embodiment, even when the lens barrel 3 does not have the open side limit value, the open side limit value is stored for each type of the lens barrel 3, so there is an open side limit value. Even when the lens barrel 3 not used is used, the open side limit value corresponding to the lens barrel 3 to be used can be acquired, whereby the aperture value at the time of focus detection is based on the open side limit value. It can be set to an appropriate value.

  The embodiments described above are described to facilitate the understanding of the present invention, and are not described to limit the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents that fall within the technical scope of the present invention.

  For example, in the embodiment described above, the open limit value corresponding to the lens barrel 3 is acquired from the memory 29, and the aperture value of the optical system at the time of focus detection is set based on the acquired open limit value. Although the configuration has been exemplified, in addition to this configuration, for example, when the open side limit value corresponding to the lens barrel 3 is not stored in the memory 29, the aperture value of the optical system is set to the open aperture value. It may be configured to perform focus detection. When focus detection is performed by setting the aperture value of the optical system to the open aperture value, when the focus lens 32 is driven based on the result of the focus detection, the aperture value of the optical system is adjusted. For example, the focus may be detected again by changing the imaging aperture value. As described above, by setting the aperture value of the optical system to the open aperture value and performing focus detection, the focus state of the optical system can be appropriately detected even when the luminance of the object is low, and the focus lens By setting the f-number of the optical system to the shooting f-number during drive of 32 and performing focus detection, the subject whose focus is detected with focus detection is shot by the change of the image plane accompanying the change of the f-number. It is possible to effectively prevent an occasional out-of-focus condition, and it is possible to properly capture an image in-focus on a subject.

  In the embodiment described above, the configuration for obtaining the open limit value from the memory 29 is exemplified, but in addition to this configuration, for example, when the lens barrel 3 stores the open limit value, The open limit value stored in the lens barrel 3 may be acquired from the lens barrel 3 via the lens control unit 37.

  Furthermore, in the above-described embodiment, the configuration in which the open limit value is stored in the memory 29 for each type of lens barrel 3 has been illustrated, but in addition to this configuration, for example, the open limit value may be It is also possible to make it possible to update (firm-up) the open-side limit value by receiving from an external server via the Internet communication line in association with the type of lens barrel.

  The camera 1 according to the above-described embodiment is not particularly limited. For example, the present invention is applied to other optical devices such as a digital video camera, a single-lens reflex digital camera, a lens integrated digital camera, and a camera for mobile phones. May be

DESCRIPTION OF SYMBOLS 1 digital camera 2 camera main body 21 camera control part 22 imaging element 221 imaging pixel 222a, 222b focus detection pixel 28 operation part 29 memory 3 lens barrel 32 focus lens 36 focus lens drive motor 37: Lens control unit

Claims (9)

An imaging unit that captures an image by an optical system having a diaphragm and outputs a signal;
A detection unit that detects a shift amount between a focusing position at which an image by the optical system is focused and the imaging unit based on a signal output from the imaging unit;
A control unit that controls the aperture value of the aperture;
The control unit is configured to detect the amount of deviation when the first aperture value is equal to or less than a first threshold while the imaging unit performs imaging in order to record the signal as image data. An imaging device configured to control a second aperture value to the first aperture value while the unit is performing imaging. The imaging apparatus according to claim 1,
An imaging device configured to control the second aperture value to the first threshold value when the first aperture value is larger than the first threshold value; The imaging device according to claim 1 or 2,
An imaging device configured to control the second aperture value to the first aperture value when the first aperture value is equal to or greater than a second threshold value smaller than the first threshold value; The imaging apparatus according to claim 3,
When the first aperture value is larger than the first threshold and the image based on the signal does not have a proper exposure, the control unit controls the second aperture value within the range equal to or less than the first threshold and greater than the second threshold. Imaging device to control. The imaging apparatus according to claim 3 or 4,
The controller controls the first aperture value to be equal to or less than the first threshold and equal to or more than the second threshold, and equal to or less than the first aperture value and equal to or more than the second threshold when an image based on the signal is not properly exposed. An imaging device for controlling the second aperture value in a range. An imaging apparatus according to any one of claims 3 to 5, wherein
The imaging device controls the second aperture value to the first aperture value when the first aperture value is equal to or less than the second threshold. The imaging apparatus according to any one of claims 3 to 6,
A mounting portion on which the interchangeable lens having the optical system can be mounted;
And a storage unit configured to store the second threshold for each interchangeable lens. The imaging apparatus according to any one of claims 3 to 6,
A mounting unit on which an interchangeable lens having the optical system and a storage unit storing the second threshold can be mounted;
An image pickup apparatus comprising: a receiving unit configured to receive information of the second threshold from the interchangeable lens. An interchangeable lens mountable on the imaging device according to any one of claims 3 to 8,
The optical system,
A storage unit that stores the second threshold;
A transmitter configured to transmit information of the second threshold to the imaging device.

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