JP5735784B2 - Imaging device and control method thereof, lens device and control method thereof - Google Patents

Description

  The present invention relates to a focus adjustment technique for a photographing optical system in an image pickup apparatus.

  As one of methods for detecting the focus state of a photographing lens, Patent Document 1 discloses an apparatus that performs focus detection by a pupil division method using a two-dimensional sensor in which a microlens is formed in each pixel of the sensor. . In the device of Patent Document 1, the photoelectric conversion unit of each pixel constituting the sensor is divided into a plurality of parts, and the divided photoelectric conversion unit is configured to receive different areas of the pupil of the photographing lens through the microlens. doing.

  Patent Document 2 discloses a solid-state imaging device that also serves as an image sensor in which pixels in which the relative positions of a microlens and a photoelectric conversion unit are displaced are two-dimensionally arranged. In the solid-state imaging device of Patent Document 2, when detecting the focus state of the photographic lens, the focus state of the photographic lens is detected based on an image generated by a pixel array having different relative displacement directions of the microlens and the photoelectric conversion unit. doing. On the other hand, when a normal image is captured, an image is generated by adding pixels having different relative displacement directions between the microlens and the photoelectric conversion unit.

  Further, Patent Document 3 discloses a solid-state imaging device that performs pupil-division focus detection using a CMOS image sensor (solid-state imaging device) used in a digital still camera. The solid-state imaging device of Patent Document 3 has a configuration in which some of the many pixels constituting the solid-state imaging device have a photoelectric conversion unit divided into two in order to detect the focus state of the photographic lens. . The photoelectric conversion unit is configured to receive a predetermined region of the pupil of the photographing lens via the microlens.

  FIG. 23 is an explanatory diagram of a light reception distribution of a pixel that performs focus detection located in the center of the solid-state imaging device disclosed in Patent Document 3, and shows a photographing lens that can be received by each of the two photoelectric conversion units. The area on the pupil is shown. In the figure, the hatched portion in the circle indicates the exit pupil of the photographic lens, and the white area Sα and the area Sβ are areas that can be received by the photoelectric conversion unit divided into two, and the optical axis of the normal photographic lens (see FIG. It is set to be symmetric with respect to the intersection of the middle x axis and the y axis.

  In the camera, the focal state of the photographic lens is detected by performing a correlation operation between the image generated by the light beam transmitted through the region Sα on the pupil of the photographic lens and the image generated by the light beam transmitted through the region Sβ. A method of performing focus detection by performing correlation calculation of images generated from light beams transmitted through different pupil regions of the photographing lens is disclosed in Patent Document 4.

  In Patent Document 4, a specific filter for correcting an image stored in a camera is deformed according to an aperture ratio, an exit pupil position, and an image shift amount. A technique for detecting a state is disclosed.

JP 58-24105 (2nd page, FIG. 1) Japanese Patent No. 2959142 (2nd page, FIG. 2) Japanese Patent Laying-Open No. 2005-106994 (page 7, FIG. 3) JP-A-5-127074 (page 15, FIG. 34)

  The photoelectric conversion unit receives a predetermined region of the pupil of the photographing lens through the microlens. FIG. 15 is a graph in which the distribution of the light receiving sensitivity for receiving a predetermined region of the pupil of the photographing lens through the microlens and the lens frame are superimposed.

  FIG. 15 is a schematic diagram in which a frame of a member that restricts a light beam such as a lens frame or a diaphragm is superimposed on the incident angle characteristic of the focus detection pixel at the center of the image sensor. The frame is actually a superposition of a plurality of frames, but one frame is shown here for simplicity.

  FIG. 15A shows the characteristics of the pixel SHA, and FIG. 15B shows the characteristics of the pixel SHB. In FIG. 15, the x-axis and y-axis represent the incident angles of the pixel in the x-direction and y-direction, respectively. FIG. 15 shows that the received light intensity is higher as the color is darker. Further, a light beam that has passed through the inside of the lens frame shape indicated by Area 1 is incident on the pixel SHA and the pixel SHB with the illustrated pupil intensity distribution.

  As apparent from FIG. 15, the light flux is displaced by a member that restricts the light flux, such as a lens frame or a diaphragm of the photographing lens. As a result, even if correlation calculation is performed based on the image generated by the light beam transmitted through the region Sα on the pupil of the photographing lens and the image generated by the light beam transmitted through the region Sβ, highly accurate focus detection cannot be performed. There was a drawback.

  In addition, the invention of Patent Document 4 has a drawback that it cannot be repaired according to the vignetting state only by deforming a specific filter stored in the camera according to conditions.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an imaging apparatus capable of performing focus detection with higher accuracy.

An imaging apparatus according to the present invention includes a first pixel group that receives a light beam passing through a first pupil region of an imaging optical system that forms a subject image, and a second pupil region of the imaging optical system. An image sensor having a second pixel group that receives a light beam passing therethrough, frame information that is information on a frame defining an outer edge of the light beam passing through the imaging optical system in the imaging optical system, An acquisition means for acquiring identification information for identifying the type from the imaging optical system; a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information And a focus state of the imaging optical system is detected based on a correction unit that corrects the signal and a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit. comprising a focus detection unit, wherein the identification information is to group the same frame identification And wherein the information der Rukoto for.

  According to the present invention, it is possible to restore an image with vignetting of a light beam with higher accuracy, and it is possible to provide an imaging device capable of performing focus detection with higher accuracy.

1 is a diagram illustrating a configuration of a camera that is an embodiment of an imaging apparatus of the present invention. The schematic circuit block diagram of an image pick-up element. Sectional drawing of the pixel part of an image pick-up element. The drive timing chart of an image pick-up element. The top view and sectional drawing of the pixel for an imaging of an image pick-up element. The top view and sectional drawing of the pixel for a focus detection for performing pupil division in the horizontal direction (lateral direction) of an imaging lens. The top view and sectional drawing of the pixel for focus detection for performing pupil division | segmentation to the orthogonal | vertical direction of an imaging lens. The figure which illustrates notionally the pupil division | segmentation condition of an image sensor. The figure explaining the image and focus detection area which were acquired at the time of focus detection. The schematic diagram showing the incident angle characteristic of the pixel for focus detection in the center of an image sensor. The figure which represented the incident angle characteristic of the pixel for focus detection in two dimensions. The figure explaining the vignetting of a light beam. The figure which showed the pupil area | region on the pupil surface Me. The figure which shows the pupil intensity distribution of the pixel for focus detection. The figure which showed the vignetting on the pupil surface Me of the focus detection pixel in the center of the image sensor. The figure which expressed the pupil intensity distribution of the incident light beam on the pupil plane Me of the focus detection pixel in the center of the image sensor in two dimensions. The figure which showed the vignetting on the pupil surface Me of the pixel of the position which has image height from the center of an image pick-up element. The figure which represented the pupil intensity distribution of the incident light beam on the pupil plane Me of the pixel of the position which has an image height from the center of an image pick-up element in two dimensions. The flowchart which shows a focus detection operation | movement. FIG. 5 is a cross-sectional view schematically showing a lens beam at a position and radius of a lens frame and an image height at which an image sensor is present. Frame information data table. A data table showing the features of the frame. Explanatory drawing of the light reception distribution of an image pick-up element.

  Hereinafter, an imaging device according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram showing a configuration of a camera which is an embodiment of an imaging apparatus of the present invention. In FIG. 1, reference numeral 101 denotes a first lens group disposed at the tip of a photographing optical system (imaging optical system), which is held so as to be able to advance and retract in the optical axis direction. Reference numeral 102 denotes an aperture / shutter, which adjusts the light amount at the time of shooting by adjusting the aperture diameter, and also has a function as an exposure time adjustment shutter at the time of still image shooting. Reference numeral 103 denotes a second lens group. The diaphragm shutter 102 and the second lens group 103 integrally move forward and backward in the optical axis direction, and perform a zooming function (zoom function) in conjunction with the forward and backward movement of the first lens group 101.

  Reference numeral 105 denotes a third lens group that performs focus adjustment by advancing and retreating in the optical axis direction. Reference numeral 106 denotes an optical low-pass filter, which is an optical element for reducing false colors and moire in a captured image. Reference numeral 107 denotes an image sensor composed of a C-MOS sensor which is a photoelectric conversion means and its peripheral circuits. The imaging element 107 is a two-dimensional single-plate color sensor in which a Bayer array primary color mosaic filter is formed on-chip on light receiving pixels of m pixels in the horizontal direction and n pixels in the vertical direction.

  Reference numeral 111 denotes a zoom actuator, which rotates a cam cylinder (not shown) to drive the first lens group 111 to the third lens group 105 forward and backward in the optical axis direction, thereby performing a zooming operation. Reference numeral 112 denotes an aperture shutter actuator that controls the aperture diameter of the aperture / shutter 102 to adjust the amount of photographing light, and controls the exposure time during still image photographing. Reference numeral 114 denotes a focus actuator that performs focus adjustment by driving the third lens group 105 back and forth in the optical axis direction.

  Reference numeral 115 denotes an electronic flash for illuminating a subject at the time of photographing, and a flash illumination device using a xenon tube is suitable, but an illumination device including an LED that emits light continuously may be used. Reference numeral 116 denotes an AF auxiliary light device that projects an image of a mask having a predetermined aperture pattern onto a subject field via a light projection lens, thereby improving the focus detection capability for a dark subject or a low-contrast subject.

  Reference numeral 121 denotes an in-camera CPU that controls various controls of the camera body, and includes a calculation unit, ROM, RAM, A / D converter, D / A converter, communication interface circuit, and the like, and a predetermined program stored in the ROM Based on this, various circuits of the camera are driven. Then, a series of operations such as AF, shooting, image processing, and recording are executed. The in-camera CPU 121 is a focus detection unit, a light amount correction unit, and a light flux regulation information correction unit of the present invention.

  An electronic flash control circuit 122 controls lighting of the electronic flash 115 in synchronization with the photographing operation. Reference numeral 123 denotes an auxiliary light driving circuit that controls the lighting of the AF auxiliary light device 116 in synchronization with the focus detection operation. An image sensor driving circuit 124 controls the image capturing operation of the image sensor 107, A / D converts the acquired image signal, and transmits it to the in-camera CPU 121. An image processing circuit 125 performs processing such as γ conversion, color interpolation, and JPEG compression of an image acquired by the image sensor 107.

  A focus drive circuit 126 controls the focus actuator 114 based on the focus detection result, and adjusts the focus by driving the third lens group 105 back and forth in the optical axis direction. Reference numeral 128 denotes an aperture shutter drive circuit which controls the aperture shutter actuator 112 to control the aperture of the aperture / shutter 102. Reference numeral 129 denotes a zoom drive circuit that drives the zoom actuator 111 in accordance with the zoom operation of the photographer.

  Reference numeral 131 denotes a display device such as an LCD, which displays information related to the shooting mode of the camera, a preview image before shooting and a confirmation image after shooting, a focus state display image at the time of focus detection, and the like. An operation switch group 132 includes a power switch, a release (shooting trigger) switch, a zoom operation switch, a shooting mode selection switch, and the like. Reference numeral 133 denotes a detachable flash memory that records a photographed image.

  FIG. 2 is a diagram showing a schematic circuit configuration of the image sensor in the present embodiment, and the technique disclosed in Japanese Patent Application Laid-Open No. 09-046596 is suitable. FIG. 2 shows the range of 2 columns × 4 rows of pixels of a two-dimensional C-MOS area sensor, but when used as an image sensor, a large number of pixels shown in FIG. Acquisition is possible. In the present embodiment, description will be made on the assumption that the pixel pitch is 2 μm, the number of effective pixels is 3000 horizontal columns × 2000 vertical rows = 6 million pixels, and the imaging screen size is 6 mm horizontal × 4 mm vertical.

  In FIG. 2, 1 is a photoelectric conversion portion of a photoelectric conversion element comprising a MOS transistor gate and a depletion layer under the gate, 2 is a photogate, 3 is a transfer switch MOS transistor, 4 is a reset MOS transistor, and 5 is a source follower amplifier MOS. It is a transistor. 6 is a horizontal selection switch MOS transistor, 7 is a load MOS transistor of the source follower, 8 is a dark output transfer MOS transistor, 9 is a light output transfer MOS transistor, 10 is a dark output storage capacitor CTN, and 11 is a light output storage capacitor CTS. . 12 is a horizontal transfer MOS transistor, 13 is a horizontal output line reset MOS transistor, 14 is a differential output amplifier, 15 is a horizontal scanning circuit, and 16 is a vertical scanning circuit.

  FIG. 3 is a cross-sectional view of the pixel portion of the image sensor according to the present embodiment. In FIG. 3, 17 is a P-type well, 18 is a gate oxide film, 19 is a first-layer poly-Si, 20 is a second-layer poly-Si, and 21 is an n + floating diffusion portion (FD). The FD unit 21 is connected to another photoelectric conversion unit via another transfer MOS transistor. In FIG. 3, the drain of the two transfer MOS transistors 3 and the FD portion 21 are made common to improve the sensitivity by miniaturization and the capacity reduction of the FD portion 21, but the FD portion 21 may be connected by an Al wiring. .

  Next, the operation will be described with reference to the timing chart of FIG. This timing chart is for the case of all pixel independent output.

  First, according to the timing output from the vertical scanning circuit 16, the control pulse φL is set to high to reset the vertical output line. Further, the control pulses φR0, φPG00, and φPGe0 are set high, the reset MOS transistor 4 is turned on, and the first-layer poly Si 19 of the photogate 2 is set high. At time T0, the control pulse φS0 is set high, the selection switch MOS transistor 6 is turned on, and the pixel portions of the first and second lines are selected. Next, the control pulse φR0 is set to low, the reset of the FD unit 21 is stopped, the FD unit 21 is set in a floating state, and the source and follower amplifier MOS transistor 5 is set to the through state. Thereafter, the control pulse φTN is set to high at time T1, and the dark voltage of the FD unit 21 is output to the storage capacitor CTN10 by the source follower operation.

  Next, in order to perform photoelectric conversion output of the pixels on the first line, the control pulse φTX00 on the first line is set to high to turn on the transfer switch MOS transistor 3, and then the control pulse φPG00 is lowered to low at time T2. At this time, a voltage relationship is preferable in which the potential well that has spread under the photogate 2 is raised so that photogenerated carriers are completely transferred to the FD portion 21. Therefore, if complete transfer is possible, the control pulse φTX may be a fixed potential instead of a pulse.

  At time T2, charges from the photoelectric conversion unit 1 of the photodiode are transferred to the FD unit 21, so that the potential of the FD unit 21 changes according to light. At this time, since the source follower amplifier MOS transistor 5 is in a floating state, the potential of the FD section 21 is output to the storage capacitor CTS11 with the control pulse φTs being high at time T3. At this time, the dark output and the light output of the pixels on the first line are stored in the storage capacitors CTN10 and CTS11, respectively, and the horizontal output line reset MOS transistor 13 is turned on by setting the control pulse φHC at time T4 to be temporarily high. Reset the line. In the horizontal transfer period, the dark output and the light output of the pixel are output to the horizontal output line by the scanning timing signal of the horizontal scanning circuit 15. At this time, if the differential output VOUT is obtained by the differential amplifier 14 of the storage capacitors CTN10 and CTS11, a signal having a good S / N from which random noise and fixed pattern noise of the pixel are removed can be obtained. The photoelectric charges of the pixels 30-12 and 30-22 are accumulated in the respective storage capacitors CTN10 and CTS11 simultaneously with the pixels 30-11 and 30-21, but the timing is read from the horizontal scanning circuit 15 by one pixel. The data is read out to the horizontal output line after being delayed and output from the differential amplifier 14.

  In the present embodiment, a configuration in which the differential output VOUT is performed in the chip is shown, but the same effect can be obtained even if a conventional CDS (Correlated Double Sampling) circuit is used outside without including it in the chip. Is obtained.

  After a bright output is output to the storage capacitor CTS11, the control pulse φR0 is set to high, the reset MOS transistor 4 is turned on, and the FD portion 21 is reset to the power supply VDD. After the horizontal transfer of the first line is completed, the second line is read. In reading the second line, the control pulse φTXe0 and the control pulse φPGe0 are driven in the same manner, and high pulses are supplied to the control pulses φTN and φTS, respectively, and photocharges are accumulated in the storage capacitors CTN10 and CTS11, respectively. Take the output. With the above driving, the first and second lines can be read independently. Thereafter, by scanning the vertical scanning circuit and reading out the second n + 1 and second n + 2 (n = 1, 2,...) In the same manner, all the pixels can be independently output. That is, when n = 1, first, the control pulse φS1 is set high, then φR1 is set low, then the control pulses φTN and φTX01 are set high, the control pulse φPG01 is set low, the control pulse φTS is set high, and the control pulse φHC Is temporarily high to read out pixel signals of the pixels 30-31 and 30-32. Subsequently, the control pulses φTXe1, φPGe1 and the control pulse are applied in the same manner as described above, and the pixel signals of the pixels 30-41 and 30-42 are read out.

  5 to 7 are diagrams illustrating the structure of the imaging pixel and the focus detection pixel. In the present embodiment, out of 4 pixels of 2 rows × 2 columns, pixels having G (green) spectral sensitivity are arranged in 2 diagonal pixels, and R (red) and B (blue) are arranged in the other 2 pixels. A Bayer arrangement in which one pixel each having a spectral sensitivity of 1 is arranged is employed. In addition, focus detection pixels having a structure to be described later are distributed and arranged in a predetermined rule between the Bayer arrays.

  FIG. 5 is a plan view and a cross-sectional view of the imaging pixel. FIG. 5A is a plan view of 2 × 2 imaging pixels located in the center of the imaging device. As is well known, in the Bayer array, G pixels are arranged diagonally, and R and B pixels are arranged in the other two pixels. A structure of 2 rows × 2 columns is repeatedly arranged.

  FIG. 5B shows a cross section AA of FIG. ML is an on-chip microlens disposed on the forefront of each pixel, CFR is an R (Red) color filter, and CFG is a G (Green) color filter. PD is a schematic diagram of the photoelectric conversion unit of the C-MOS sensor described with reference to FIG. 3, and CL is a wiring layer for forming signal lines for transmitting various signals in the C-MOS sensor. TL schematically shows the photographing optical system.

  Here, the on-chip microlens ML and the photoelectric conversion unit PD of the imaging pixel are configured to capture the light beam that has passed through the photographing optical system ML as effectively as possible. In other words, the exit pupil EP of the photographing optical system TL and the photoelectric conversion unit PD are conjugated with each other by the microlens ML, and the effective area of the photoelectric conversion unit is designed to be large. Further, although the incident light beam of the R pixel has been described in FIG. 5B, the G pixel and the B (Blue) pixel have the same structure. Accordingly, the exit pupil EP corresponding to each of the RGB pixels for imaging has a large diameter, and the S / N of the image signal is improved by efficiently capturing the light flux from the subject.

  FIG. 6 is a plan view and a cross-sectional view of a focus detection pixel for performing pupil division in the x direction in the drawing of the photographing lens. FIG. 6A is a plan view of 2 × 2 pixels including focus detection pixels located at the center of the image sensor. When obtaining an imaging signal, the G pixel is a main component of luminance information. Since human image recognition characteristics are sensitive to luminance information, image quality degradation is likely to be recognized if G pixels are lost. On the other hand, the R or B pixel is a pixel that acquires color information. However, since humans are insensitive to color information, pixels that acquire color information are less likely to notice deterioration in image quality even if some loss occurs. Therefore, in the present embodiment, among the pixels in 2 rows × 2 columns, the G pixel is left as an imaging pixel, and focus detection pixels are arranged at a certain ratio to pixels at positions corresponding to R and B. This is indicated by SHA and SHB in FIG.

  A cross section BB of FIG. 6A is shown in FIG. The microlens ML and the photoelectric conversion unit PD have the same structure as the imaging pixel shown in FIG. In the present embodiment, since the signal of the focus detection pixel is not used for image creation, a transparent film CFW (White) is arranged instead of the color separation color filter. Further, since pupil division is performed by the image sensor, the opening of the wiring layer CL is deviated in the x direction with respect to the center line of the microlens ML. Specifically, since the opening OPHA of the pixel SHA is biased in the −x direction, the light beam that has passed through the exit pupil EPHA (first pupil region) on the left side of the photographic lens TL is received. Similarly, since the opening OPHB of the pixel SHB is biased in the + x direction, the light beam that has passed through the right exit pupil EPHB (second pupil region) of the photographic lens TL is received. Therefore, the pixels SHA are regularly arranged in the x direction, the subject image acquired by these pixel groups (corresponding to the first pixel group of the present invention) is set as an A image, and the pixels SHB are also regularly arranged in the x direction. If the subject image acquired by these pixel groups (corresponding to the second pixel group of the present invention) is a B image, the relative position between the A image and the B image is detected, so that the subject image defocus amount ( Defocus amount) can be detected.

  In the pixels SHA and SHB, focus detection is possible for an object having a luminance distribution in the x direction on the photographing screen, for example, a line in the y direction, but a line in the x direction having a luminance distribution in the y direction is the focus. It cannot be detected. Therefore, in the present embodiment, pixels that perform pupil division are also provided in the y direction of the taking lens so that the latter can be detected in focus.

  FIG. 7 is a plan view and a cross-sectional view of focus detection pixels for performing pupil division in the y direction in the drawing of the photographing lens. FIG. 7A is a plan view of pixels of 2 rows × 2 columns including focus detection pixels located at the center of the image sensor. As in FIG. 6A, G pixels are left as image capture pixels, and R Focus detection pixels are arranged at a certain ratio in pixels corresponding to positions B and B. This is indicated by SVC and SVD in FIG.

  FIG. 7B shows a cross-section C-C of FIG. 7A. The pixel of FIG. 6B has a structure in which the pupil is separated in the x direction, whereas the pixel of FIG. Only the pupil separation direction is in the y direction, and the pixel structure does not change. That is, since the opening OPVC of the pixel SVC is biased in the −y direction, the light beam that has passed through the exit pupil EPVC in the + y direction of the photographic lens TL is received. Similarly, since the opening OPVD of the pixel SVD is biased in the + y direction, the light beam that has passed through the exit pupil EPVD of the photographing lens TL in the −y direction is received. Therefore, the pixels SVC are regularly arranged in the y direction, the subject images acquired by these pixel groups are set as C images, the pixels SVD are also regularly arranged in the y direction, and the subject images acquired by these pixel groups are Assuming a D image, the amount of defocus (defocus amount) of a subject image having a luminance distribution in the y direction can be detected by detecting the relative position of the C image and the D image.

  FIG. 8 is a diagram conceptually illustrating the pupil division state of the image sensor in the present embodiment. TL is a photographing lens, 107 is an image sensor, OBJ is a subject, and IMG is a subject image.

  As described in the plan view and the cross-sectional view of the imaging pixel of the imaging device in FIG. 5, the imaging pixel receives the light beam that has passed through the entire exit pupil EP of the imaging lens. On the other hand, the focus detection pixel includes a plan view and a cross-sectional view of the focus detection pixel for performing pupil division in the x direction in FIG. 6, and a plan view of the focus detection pixel for performing pupil division in the y direction in FIG. 7. As described in the cross-sectional view, it has a pupil division function. Specifically, the pixel SHA in FIG. 6 receives a light beam that has passed through the pupil on the + X direction side, that is, a light beam that has passed through the pupil EPHA in FIG. Similarly, the pixels SHB, SVC, and SVD receive light beams that have passed through the pupils EPHB, EPVC, and EPVD, respectively. The focus detection pixels are distributed over the entire area of the image sensor 107, thereby enabling focus detection in the entire image pickup area.

  FIG. 9 is a diagram illustrating an image acquired at the time of focus detection and a focus detection area. In FIG. 9, the subject image formed on the imaging surface shows a person in the center, a tree in the foreground on the left side, and a mountain range in the foreground on the right side. In the present embodiment, the focus detection pixels are arranged such that the pixel pairs SHA and SHB for detecting the x-direction deviation and the pixel pairs SVC and SVD for detecting the y-direction deviation are arranged at an equal density over the entire imaging region. Has been. In detecting the x-direction deviation, a pair of image signals obtained from the pixel pair SHA and SHB for detecting the x-direction deviation is used as an AF pixel signal for phase difference calculation. When detecting the y-direction deviation, a pair of image signals obtained from the y-direction deviation detection pixel pair SVC and SVD is used as an AF pixel signal for phase difference calculation. Therefore, it is possible to set a distance measurement area for detecting an x-direction deviation and a y-direction deviation at an arbitrary position in the imaging area.

  In FIG. 9, a human face exists in the center of the screen. Therefore, when the presence of a face is detected by a known face recognition technique, a focus detection area AFARh (x1, y1) for detecting a deviation in the x direction around the face area and a focus detection area AFARv for detecting a deviation in the y direction. (X3, y3) is set. Here, the subscript h represents the x direction, and (x1, y1) and (x3, y3) represent the coordinates of the upper left corner of the focus detection area. Then, an A image signal for phase difference detection obtained by connecting focus detection pixels SHA for detecting x-direction deviation included in each section of the focus detection area AFARh (x1, y1) over 30 sections is AFSIGh (A1). is there. Similarly, a B image signal for phase difference detection obtained by connecting focus detection pixels SHB for detecting deviation in the x direction of each section over 30 sections is AFSIGh (B1). Then, by calculating the relative x-direction shift amount between the A image signal AFSIGh (A1) and the B image signal AFSIGh (B1) by a known correlation calculation, the defocus amount (defocus amount, focus state) of the photographing lens. ).

  The defocus amount is similarly obtained for the focus detection area AFARv (x3, y3). Then, the two defocus amounts detected in the x-direction shift and y-direction shift focus detection regions are compared, and a highly reliable value may be adopted.

  On the other hand, the trunk of the tree on the left side of the screen is mainly composed of the y-direction component, that is, has a luminance distribution in the x-direction. An area AFARh (x2, y2) is set. Further, the mountain ridge on the right side of the screen is mainly composed of x-direction components, that is, has a luminance distribution in the y-direction, so that it is determined as a subject suitable for y-direction deviation detection, and focus detection for y-direction deviation detection is performed. An area AFARv (x4, y4) is set.

  As described above, in this embodiment, since the focus detection area for detecting the x-direction shift and the y-direction shift can be set at an arbitrary position on the screen, even if the projection position of the subject and the directionality of the luminance distribution are various. , Focus detection is always possible. Since the principle is the same except that the x-direction deviation and the y-direction deviation are different from each other, the following description is for detecting the x-direction deviation, and the explanation for the y-direction deviation detection is omitted.

  10A and 10B are schematic diagrams showing the incident angle characteristics of the focus detection pixel at the center of the image sensor. FIG. 10A shows the characteristics of the pixel SHA, and FIG. 10B shows the characteristics of the pixel SHB. In FIG. 10, the x-axis and y-axis represent the incident angles of the pixel in the x-direction and y-direction, respectively. FIG. 10 shows that the received light intensity is higher as the color becomes darker. In FIG. 6, for ease of explanation, the exit pupil of the pixel SHA is shown separately as EPHA, and the exit pupil of the pixel SHB is shown separately as EPHB. However, as shown in FIG. 10, the exit pupils of the pixel SHA and the pixel SHB are actually partial areas in order to reduce the influence of diffraction due to the openings OPHA and the openings OPHB or to improve the SN. There are overlapping parts. FIG. 11 is a one-dimensional representation of the incident angle characteristics of the focus detection pixels. The abscissa represents the incident angle, the ordinate represents the sum of the light receiving sensitivity in the θy direction in FIG. 10, and the origin is the optical axis. As shown in FIG. 11, in the focus detection pixel at the center of the image sensor, the incident angle characteristics of the pixel SHA and the pixel SHB are substantially symmetric with respect to the optical axis.

  FIG. 12 is a diagram for explaining the vignetting of the light beam. FIG. 12A shows a light beam incident on a pixel at the center of the image sensor, and FIG. 12B shows a light beam incident on a pixel at a position having an image height from the center of the image sensor. A light beam whose outer edge is limited by several components such as a lens holding frame of the photographing lens and the diaphragm 102 is incident on the image sensor. Here, in order to make the explanation easy to understand, it is assumed that there are two members that limit the light flux at any image height.

  In Iw1 and Iw2, a member that restricts the luminous flux is used as a window, and the luminous flux passes through the inside. Me represents a pupil plane set by the configuration of the microlens ML. With reference to FIG. 12A, vignetting of the light beam incident on the pixel at the center of the image sensor will be described. L1rc and L1lc represent the outer periphery of the light beam emitted from the window Iw1, L1rc represents the right end in FIG. 12, and L1lc represents the left end in FIG. L2rc and L2lc represent the outer periphery of the projection of the light beam emitted from the window Iw2 up to the pupil position of the microlens ML, L2rc indicates the right end in FIG. 12, and L2lc indicates the left end in FIG. As shown in FIG. 12A, the pupil region on the pupil plane Me of the light beam incident on the image sensor central pixel is indicated by a light beam having L2lc and L2rc as outer circumferences, that is, an arrow Area1. Next, with reference to FIG. 12B, vignetting of a light beam incident on a pixel at a position having an image height from the center of the image sensor will be described. L1rh and L1lh represent the outer periphery of the light beam emitted from the window Iw1, L1rh represents the right end in FIG. 12, and L1lh represents the left end in FIG. L2rh and L2lh represent the outer periphery of the projected light beam of the window Iw2 up to the pupil position of the microlens ML, L2rh indicates the right end in FIG. 12, and L2lh indicates the left end in FIG. As shown in FIG. 12B, the pupil region on the pupil plane Me of the light beam incident on the pixel at the position having the image height from the center of the image sensor is a light beam having L1lh and L2rh as outer circumferences, that is, an arrow Area2. Indicated by

  FIG. 13 is a diagram showing a pupil region on the pupil plane Me. FIG. 13A shows a pupil region of a pixel at the center of the image sensor, and FIG. 13B shows a pupil region of a pixel at a position having an image height from the center of the image sensor. As described with reference to FIG. 12, since the light beam limited by the same window Iw2 is incident on the pixel in the center of the image sensor, the shape of the window Iw2 is projected as it is in the pupil area Area1 as shown in FIG. . Since the window for limiting the luminous flux is circular, the shape of the pupil area Area1 is also circular. On the other hand, since the light beam limited by Iw1 and Iw2 enters the pixel at the image height from the center of the image sensor, the pupil area Area2 has a shape as shown in FIG.

  FIG. 14 is a diagram showing a pupil intensity distribution of focus detection pixels. This is equivalent to the incident angle characteristic of the focus detection pixel at the center of the image sensor shown in FIG. 10 projected onto the pupil of the microlens ML, and the vertical and horizontal axes in FIG. 14 are expanded to the coordinates on the pupil. Is. This pupil intensity distribution has the same characteristics for pixels at positions having an image height from the center of the image sensor. This is because the microlens ML of the pixel at a position having an image height from the center of the image sensor is made eccentric so that the center of the optical axis passes through the center of the pupil of the microlens ML.

  FIG. 15 is a diagram showing vignetting on the pupil plane Me of the focus detection pixel at the center of the image sensor. FIG. 15A shows the characteristics of the pixel SHA, and FIG. 15B shows the characteristics of the pixel SHB. FIG. 15 is a view obtained by superimposing FIG. 13A and FIG. 14. A light beam transmitted through the inside of the shape indicated by Area 1 is incident on the pixel SHA and the pixel SHB with the illustrated pupil intensity distribution. FIG. 16 is a two-dimensional representation of the pupil intensity distribution of the incident light beam on the pupil plane Me of the focus detection pixel at the center of the image sensor. The horizontal axis represents coordinates in the x direction on the pupil plane Me, and the vertical axis represents the intensity of each coordinate. The intensity of each coordinate is obtained by adding the pupil intensity in the y direction in FIG. The pupil intensity distribution of the incident light beam on the pupil plane Me of the pixel SHA and the pixel SHB is indicated by EsdAc and EsdBc. As shown in FIG. 15, the pupil intensity distribution on the pupil plane Me of the pixel SHA and the pixel SHB is vignetted by a member that restricts a light beam such as a lens frame or a diaphragm of the photographing lens.

  FIG. 17 is a diagram showing vignetting on a pupil plane Me of a pixel at an image height from the center of the image sensor. FIG. 17A shows the characteristics of the pixel SHA, and FIG. 17B shows the characteristics of the pixel SHB. FIG. 17 is a view obtained by superimposing FIG. 13B and FIG. 14. A light beam transmitted through the inside of the shape indicated by Area 2 is incident on the pixel SHA and the pixel SHB with the illustrated pupil intensity distribution. FIG. 18 is a two-dimensional representation of the pupil intensity distribution of the incident light beam on the pupil plane Me of the pixel located at the image height from the center of the image sensor. The horizontal axis represents coordinates in the x direction on the pupil plane Me, and the vertical axis represents the intensity of each coordinate. The intensity of each coordinate is obtained by adding the pupil intensity in the y direction in FIG. 17 in a direction orthogonal to the pupil separation direction. In FIG. 18, the pupil intensity distributions of incident light beams on the pupil plane Me of the pixel SHA and the pixel SHB are indicated by EsdAh and EsdBh.

  As described above, the pixels SHA are regularly arranged in the x direction, the subject image A image acquired by these pixel groups, and the pixels SHB are also regularly arranged in the x direction, and the subjects acquired by these pixel groups. By detecting the relative position with respect to the image B image, the focus shift amount (defocus amount) of the subject image is detected.

  If the light amount distribution of the subject is f (x, y) and the light amount distribution of the subject image is g (x, y),

(Convolution) is established. Here, h (x, y) is a transfer function representing a state in which the subject deteriorates in the image forming system, and is called a point spread function. Therefore, in order to know a pair of subject images used for focus detection, it is necessary to know a point spread function. Here, in the phase difference type focus detection, attention is paid to the one-dimensional direction of a pair of subject images, and the phase shift is detected. Therefore, instead of the point spread function, a linear image distribution function ( The line spread function can evaluate the image system for focus detection. Therefore, when the light amount distribution of the subject is replaced with f (x) and the light amount distribution of the subject image is replaced with g (x), the above equation (1) can be rewritten as follows using the line image distribution function L (a).

  Therefore, a pair of subject image can be known by knowing a pair of line image distribution functions generated by light fluxes passing through different pupil regions in the phase shift direction at any defocusing time from the equation (2). . If a pair of subject images is known, the base line length can be obtained from the center-of-gravity interval of each subject image, and the defocus amount can be calculated from the image shift amount and base line length of the pair of subject images. The baseline length can be determined by the following equations (3) to (5). If the center of gravity of the subject image is GA, GB, and the baseline length is G,

... (3), (4), (5)
Next, the focus detection operation of this embodiment will be described using the flowchart of FIG. The operation in the flowchart of FIG. 19 is executed by the CPU 121 which is a focus detection unit, a light amount correction unit, and a light flux regulation information correction unit of the present invention.

  In step S1, lens information for knowing the vignetting state is read, and the process proceeds to step S2. Although details of the lens information will be described later, in addition to the F value and the zoom state which are imaging conditions, the frame information in the present embodiment and the cumulative driving number of the aperture are included in the lens information.

In step S2, distance measurement point information such as the distance measurement position and range set by the user is read. After completion, the process proceeds to step S3.
In step S3, a frame that defines the lens luminous flux is calculated. Although details will be described later, the frame defining the lens luminous flux is frame information (position, position) of the image height corresponding to the distance measurement point information acquired in step S2 from the frame information included in the lens information read in step 1. (Radius, frame identification information) is read, and the manufacturing error correction and endurance correction are performed by the light beam regulation information correction means.

  In step S4, the pupil intensity distribution stored in the ROM in the CPU 121 is read for each focus detection pixel, and the line image distribution function is calculated together with the light flux defining frame obtained in step S3. After completion, the process proceeds to step S5.

  In step S5, the center of gravity of the line image distribution function obtained in step S4 is calculated, and the baseline length is obtained. Details of the calculation method of the baseline length will be described later. When completed, the process proceeds to step S6. In step S6, the image signal of the focus detection pixel at the distance measurement position read in step S2 is read, and the subject A image and the subject B image are formed. After completion, the process proceeds to step S7.

  In step S7, the amount of vignetting of the subject image A image and the subject image B image is predicted from the light flux defining frame calculated in step S3, and light amount correction is performed to adjust the light amount ratio of the A image B image. After the light amount correction, the process proceeds to step S8.

  In step S8, the focus detection unit obtains an image shift amount by a known correlation calculation method using the subject image A image and the subject image B image after light amount correction obtained in step S7, and obtains a defocus amount. After calculating the defocus amount, the process proceeds to step S9.

  In step S9, it is determined whether or not the calculated defocus amount is in focus. If it is not determined that the subject is in focus, the process proceeds to step S10. If it is determined that focus is achieved, the process proceeds to step S11.

  In step S10, the third lens group 105 is advanced or retracted according to the calculated defocus calculation result. Then, the process returns to step S6. In step S11, a series of focus detection flows ends.

  Next, the lens information acquired in step S1 will be described in detail with reference to FIGS. The lens information includes the F value of the current shooting condition, the zoom state, the cumulative number of aperture driving times, and frame information. The zoom state is a position in the zoom lens when the distance from the Tele end to the Wide end is divided into, for example, two divisions or 50 divisions. Further, the frame information includes information on the position and radius of the frame, which is light flux defining information, and frame identification information.

  FIG. 20 is a cross-sectional view schematically showing a lens beam at a position and radius of the lens frame and an image height at which the image sensor 107 is present. FIG. 21 is an example of a data table of frame information held in a certain F value and a certain zoom state. Similar information is held in each F value and each zoom state. Here, the image heights 0, 1, and 2 are given as examples, but data up to a high image height is actually held at a finer pitch so as to correspond to the selected distance measuring point.

  In FIG. 20, when the image height is 0, the lens luminous flux is blocked only by the frame B which is the lens diaphragm. On the other hand, in the state where the image height is 1, for example, it can be seen that the lens luminous flux is blocked by the two frames of the frame C as the rear frame of the lens and the frame B as the stop.

  According to such a situation, as shown in FIG. 21, for each image height, the frame that blocks the lens light flux is set as the frame 1 and the frame 2, and information on the position, radius, and type is held for each. The position is a position in the optical axis direction of the frame that blocks the lens light flux when viewed from the pixel of the image sensor through the lens. The radius is a radius of a frame that blocks the lens light flux when viewed from the pixels of the image sensor through the lens. The type is frame identification information for identifying the type of the frame that blocks the lens luminous flux. For example, in the example of FIG. 20, whether the frame A is the front frame, the frame B is the stop, or the frame C is the rear frame. This is information for identification.

  For example, even if the rear lens frame is actually a single frame, when viewed from the pixels of the image sensor through the imaging optical system, the position and the radius appear different depending on the image height. For this reason, the light flux defining information has information on how it looks from the pixels of the image sensor for each image height, not the actual position and radius of the object. However, frame identification information for identifying the type of the frame is retained in order to recognize (group) the same frame as the actual object.

  FIG. 22 is a data table showing the features of the frame identified by the frame identification information. The manufacturing error indicates the magnification of the actual frame radius with respect to the design value. The durability correction indicates a coefficient of the frame radius change amount with respect to the number of times of aperture driving.

  The luminous flux defining information is used by being projected onto the exit pupil plane of the lens when obtaining the line image distribution function. At that time, if there is a slight error in the position or radius of the frame located near the image sensor, a large error will occur at the exit pupil position of the lens. On the other hand, the frame located far from the image sensor has little positional fluctuation when projected onto the exit pupil position of the lens even if there is an error in position or radius. Therefore, in the present embodiment, no manufacturing error information is held for the frame C located far from the image sensor.

  Of the frames that define the luminous flux, those with lens barrels such as frame A and frame B are constant regardless of the number of times the diaphragm is driven, but those with a diaphragm have a radius depending on the cumulative number of times the diaphragm is driven. May change. For example, when the aperture is repeatedly driven, the shaft that determines the aperture position is worn, and the radius at the time of aperture may change more than before the repeated drive. Therefore, only the frame B, which is a diaphragm, has a durability correction coefficient.

  The above is the description of the lens information. These pieces of lens information are used for determining the luminous flux defining frame in step S3, and further using the information, line image creation in step S4 and light amount correction in step S7 are performed.

  Next, the determination of the luminous flux regulation frame in step S3 will be described in detail.

  First, frame information (position, radius, frame identification information) of image height corresponding to the F value, zoom state, and distance measuring point information of the current shooting condition from the light flux defining information included in the lens information read out in step S1. ). Next, the manufacturing error correction and the durability correction are performed by the light beam regulation information correcting means.

  Manufacturing error correction and durability correction are performed in accordance with frame identification information included in the frame information. Specifically, the radius Rh of the frame after correction is expressed as follows using the radius R of the frame before correction, the manufacturing error Fer, the durability correction coefficient Uer, and the number of aperture driving times Nd.

Rh = R × Fer + (1 + Nd × Uer)
As described above, since the manufacturing error amount is corrected for the radius of the frame that defines the light beam, the frame that defines the light beam can be obtained more accurately. In addition, since the radius of the frame is changed according to the cumulative number of times of driving the diaphragm, even if the radius of the frame is changed by driving the diaphragm, it is possible to obtain a frame that defines the light flux more accurately.

  Further, as described above, the light flux defining information has a different value for each image height even if the actual object is one frame. In the present embodiment, since the frame information holds the frame identification information, if an actual manufacturing error or durability correction value is obtained, it can be easily reflected in all the light flux defining information. Specifically, as the luminous flux defining information, information that looks differently in a frame having different radii and positions depending on the image height is also referred to the frame identification information, so that all the frames formed by the same frame are the same. Manufacturing error information can be applied. In addition, it is possible to apply durability correction only to the frame information defined by the diaphragm from the light flux defining information defined by various frames.

  Further, since the light flux defining information of the frame located near the image sensor is higher in accuracy than the light flux defining information of the frame located far from the image sensor, it can be corrected more accurately with a smaller amount of data. .

  Next, the baseline length calculation method in step S5 will be described in detail.

  First, a line image corresponding to the subject image A (hereinafter referred to as line image A) and a line image corresponding to the subject image B image (hereinafter referred to as line image B) are moved so as to coincide with each other. Assuming that the moved line image A and line image B are the line image A0 and the line image B0, respectively, the line image A is convolved and integrated with the line image B0, and the line image B is convolved with the line image A0. The corrected baseline length is calculated from the center of gravity interval of the corrected line image B. This is expressed as follows.

  The equation for calculating the corrected line image A is MA (x) for the corrected line image A, LA (x) for the line image A, and LB '(x) for the line image B0.

(6)
Therefore, if the center of gravity of the corrected line image A is GA ′,

... (7)
It becomes.

  Similarly, the equation for obtaining the corrected line image B is as follows. If the corrected line image B is MB (x), the line image B is LB (x), and the line image A0 is LA ′ (x),

... (8)
Therefore, if the center of gravity of the corrected line image B is GB ′,

... (9)
It becomes.

  Therefore, if the baseline length to be obtained is G ′,

(10)
The baseline length is calculated by the above calculation.

  With the configuration as described above, it is possible to repair vignetting caused by a member that restricts the light flux, such as a lens frame and a diaphragm, with higher accuracy, and it is possible to perform focus detection with higher accuracy.

  More specifically, in step S3, the manufacturing error amount is corrected with respect to the design value for the radius of the frame that defines the luminous flux, so that the frame that defines the luminous flux can be obtained more accurately. In step S3, since the radius of the frame is changed according to the number of times the diaphragm is driven, even if the radius of the frame changes due to the driving of the aperture, a frame that defines the light flux more accurately can be obtained.

  In addition, since the frame information holds the frame identification information, the actual manufacturing error and durability correction information can be easily reflected in the light flux defining information. In addition, since the light flux defining information of the frame located close to the image sensor is more accurate than the light flux defining information of the frame far from the image sensor, a frame that defines the light flux more accurately with a smaller amount of data. Can be sought.

  In this embodiment, a known image shift method is used for the correlation calculation, but the same result can be obtained even if another method is used.

  Further, in this embodiment, the focus calculation method using an image sensor composed of a C-MOS sensor and its peripheral circuit as a photoelectric conversion means has been described as an example, but a conventional single-lens reflex camera using a line sensor as a photoelectric conversion means. It is also effective in a focus detection device of a camera pupil division type.

  Further, in the present embodiment, in order to make the explanation easy to understand, a model in which a maximum of two frames can be seen simultaneously from an imaging pixel having a certain image height has been described. The position, radius, and frame identification information of the frame 4 may be held.

  Further, in the present embodiment, for easy understanding of the description, it is assumed that the frame that blocks the lens luminous flux is a circle, and the luminous flux defining information is expressed by two parameters, position and radius. However, for example, as the luminous flux defining information, an ellipse or a polygon may be assumed and further parameters may be provided.

  In the present embodiment, the rear frame C located far from the image sensor reduces the amount of data by not having manufacturing error information. For example, even if the manufacturing error information is held, the front frame A configuration may be adopted in which A is held with reduced accuracy.

  Further, in the present embodiment, as an example of correction of the luminous flux regulation information, the case where both the manufacturing error correction and the durability correction are corrected for the radius of the frame has been described as an example. However, the frame position may be corrected.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

Claims (14)

A first pixel group that receives a light beam that passes through a first pupil region of an imaging optical system that forms a subject image, and a second pixel that receives a light beam that passes through a second pupil region of the imaging optical system. An image sensor having a pixel group of
Acquisition means for acquiring from the imaging optical system frame information, which is information about a frame defining an outer edge of a light beam passing through the imaging optical system in the imaging optical system, and identification information for identifying the type of the frame When,
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the imaging optical system based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit ;
The identification information, the image pickup apparatus, wherein information der Rukoto for identifying and grouping the same frame.   The frame information includes information on the position of the frame, the shape of the frame, and the size of the frame when viewed from each pixel of the first and second pixel groups through the imaging optical system. The imaging apparatus according to claim 1. The identification information, the image pickup according to claim 1 or 2, characterized in that the number of times of driving of the aperture provided in the imaging optical system is information for identifying whether the frame information changes apparatus. A first pixel group that receives a light beam that passes through a first pupil region of an imaging optical system that forms a subject image, and a second pixel that receives a light beam that passes through a second pupil region of the imaging optical system. An image sensor having a pixel group of
Acquisition means for acquiring from the imaging optical system frame information, which is information about a frame defining an outer edge of a light beam passing through the imaging optical system in the imaging optical system, and identification information for identifying the type of the frame When,
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the imaging optical system based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit;
The imaging apparatus according to claim 1, wherein the identification information is information for identifying whether or not the frame information changes depending on a number of times of driving of a diaphragm provided in the imaging optical system. The frame information includes information on the position of the frame, the shape of the frame, and the size of the frame when viewed from each pixel of the first and second pixel groups through the imaging optical system. The imaging apparatus according to claim 4. A first pixel group that receives a light beam that passes through a first pupil region of an imaging optical system that forms a subject image, and a second pixel that receives a light beam that passes through a second pupil region of the imaging optical system. A method for controlling an imaging apparatus including an imaging device having a pixel group of:
An acquisition step of acquiring from the imaging optical system frame information, which is information on a frame defining an outer edge of a light beam passing through the imaging optical system in the imaging optical system, and identification information for identifying the type of the frame. When,
A correction step of correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection step of detecting a focus state of the imaging optical system based on the signal from the first pixel group and the signal from the second pixel group corrected in the correction step. ,
The method of controlling an imaging apparatus, wherein the identification information is information for grouping and identifying the same frame. A first pixel group that receives a light beam that passes through a first pupil region of an imaging optical system that forms a subject image, and a second pixel that receives a light beam that passes through a second pupil region of the imaging optical system. A method for controlling an imaging apparatus including an imaging device having a pixel group of:
An acquisition step of acquiring from the imaging optical system frame information, which is information on a frame defining an outer edge of a light beam passing through the imaging optical system in the imaging optical system, and identification information for identifying the type of the frame. When,
A correction step of correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection step of detecting a focus state of the imaging optical system based on the signal from the first pixel group and the signal from the second pixel group corrected in the correction step. ,
The method for controlling an imaging apparatus according to claim 1, wherein the identification information is information for identifying whether or not the frame information changes depending on a number of times of driving of a diaphragm provided in the imaging optical system. A first pixel group that receives a light beam that passes through a first pupil region of a lens device that forms a subject image; and a second pixel group that receives a light beam that passes through a second pupil region of the lens device; An imaging device having:
Acquisition means for acquiring, from the lens device, frame information that is information of a frame that defines an outer edge of a light beam that passes through the lens device in the lens device, and identification information that identifies the type of the frame;
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the lens device based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit. The lens device used,
The lens apparatus, wherein the frame information and the identification information are stored so as to be transmittable, and the identification information is information for grouping and identifying the same frame. The frame information includes information on a position of the frame, a shape of the frame, and a size of the frame when viewed from each pixel of the first and second pixel groups through the lens device. The lens apparatus according to claim 8, characterized in that: The lens apparatus according to claim 8, wherein the identification information is information for identifying whether or not the frame information changes depending on a number of times of driving of a diaphragm provided in the lens apparatus. A first pixel group that receives a light beam that passes through a first pupil region of a lens device that forms a subject image; and a second pixel group that receives a light beam that passes through a second pupil region of the lens device; An imaging device having:
Acquisition means for acquiring, from the lens device, frame information that is information of a frame that defines an outer edge of a light beam that passes through the lens device in the lens device, and identification information that identifies the type of the frame;
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the lens device based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit. The lens device used,
The frame information and the identification information are stored so as to be transmitted, and the identification information is used to identify whether or not the frame information changes depending on the number of times the diaphragm provided in the imaging optical system is driven. The lens apparatus characterized by the above-mentioned. The frame information includes information on a position of the frame, a shape of the frame, and a size of the frame when viewed from each pixel of the first and second pixel groups through the lens device. The lens apparatus according to claim 11, characterized in that: A first pixel group that receives a light beam that passes through a first pupil region of a lens device that forms a subject image; and a second pixel group that receives a light beam that passes through a second pupil region of the lens device; An imaging device having:
Acquisition means for acquiring, from the lens device, frame information that is information of a frame that defines an outer edge of a light beam that passes through the lens device in the lens device, and identification information that identifies the type of the frame;
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the lens device based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit. A method for controlling the lens device used, comprising:
A method for controlling a lens apparatus, comprising: storing the frame information and the identification information in a transmittable manner, wherein the identification information is information for grouping and identifying the same frame. A first pixel group that receives a light beam that passes through a first pupil region of a lens device that forms a subject image; and a second pixel group that receives a light beam that passes through a second pupil region of the lens device; An imaging device having:
Acquisition means for acquiring, from the lens device, frame information that is information of a frame that defines an outer edge of a light beam that passes through the lens device in the lens device, and identification information that identifies the type of the frame;
Correction means for correcting a signal from the first pixel group and a signal from the second pixel group based on the frame information and the identification information;
A focus detection unit that detects a focus state of the lens device based on a signal from the first pixel group and a signal from the second pixel group corrected by the correction unit. A method for controlling the lens device used, comprising:
The frame information and the identification information are stored so as to be transmittable, and the identification information identifies whether the frame information changes depending on the number of times of driving of the diaphragm provided in the imaging optical system. The control method of the lens apparatus characterized by the above-mentioned.