JP6222949B2 - Imaging device and imaging apparatus - Google Patents

Description

  The present invention relates to an imaging element and an imaging apparatus.

  As one of methods for detecting the focus state of the photographing lens, there is a pupil division phase difference method (imaging surface phase difference method) using an image pickup element in which a microlens is formed in each pixel arranged two-dimensionally. For example, Patent Document 1 describes a configuration in which a pair of focus detection pixels is partially arranged on an image sensor in which image pickup pixels are two-dimensionally arranged. The pair of focus detection pixels are configured to receive different areas of the exit pupil of the photographing lens by a light shielding layer having an opening, and perform pupil division. The focus detection is performed by obtaining the image shift amount from the signal of the focus detection pixel. Further, as a conventional technique, there is a configuration in which the macro lens curvature of the focus detection pixel is different from the micro lens curvature of the imaging pixel in order to improve the pupil division performance of the focus detection pixel. Further, in order to improve the light receiving sensitivity of the focus detection pixels, there is a configuration in which a color filter that decreases the transmittance is not provided.

JP 2000-156823 A

  However, since the configuration of the focus detection pixel is different from the configuration of the imaging pixel, the crosstalk light amount from the focus detection pixel to the adjacent pixel due to the oblique incident light is different from the crosstalk light amount from the imaging pixel to the adjacent pixel. There is a case. In this case, depending on the photographing conditions, the light amount floats or sinks in the imaging pixels around the focus detection pixels.

  The present invention has been made in view of the above problems, and an object of the present invention is to reduce the difference between the crosstalk light amount from the focus detection pixel to the adjacent pixel and the crosstalk light amount from the imaging pixel to the adjacent pixel due to obliquely incident light. Is to realize.

In order to solve the above problems and achieve the object, an imaging device of the present invention includes a plurality of imaging pixels that receive a light beam passing through a pupil region of an imaging optical system, and a pupil part that is a partial region of the pupil region. A plurality of focus detection pixels that receive a light beam including a predetermined wavelength component that passes through the region, and an image sensor in which a centroid of the pupil region and a centroid of the pupil partial region are different from each other, A transmissive member capable of transmitting the light fluxes having a plurality of different spectral transmittances in the predetermined wavelength component is disposed in the focus detection pixel, and the transmissive member is a peripheral portion adjacent to the imaging pixel in the predetermined wavelength component Is configured to be smaller than the spectral transmittance of the central portion.

  According to the present invention, it is possible to reduce the difference between the crosstalk light amount from the focus detection pixel to the adjacent pixel and the crosstalk light amount from the photographing pixel to the adjacent pixel due to the oblique incident light.

1 is a diagram illustrating a configuration of an imaging apparatus according to an embodiment of the present invention. FIG. 3 is a diagram schematically showing a pixel array of the present embodiment. FIG. 2 is a plan view and a cross-sectional view illustrating a schematic configuration of a first focus detection pixel of the present embodiment. The top view and sectional drawing which show schematic structure of the 2nd focus detection pixel of this embodiment. The top view and sectional drawing which show schematic structure of the imaging pixel of this embodiment. The top view and sectional drawing which show schematic structure of the pixel for a focus detection of the modification of this embodiment. FIG. 3 is a cross-sectional view of an image sensor in which an imaging pixel and a focus detection pixel of the present embodiment are adjacent to each other. The top view and sectional drawing of the conventional CMOS image pick-up element with which G image pick-up pixel and R image pick-up pixel adjoin. The top view and sectional drawing of the conventional CMOS image sensor with which an imaging pixel and the W focus detection pixel adjoin. The figure which illustrates light intensity distribution of the incident light parallel to the optical axis of this embodiment. The figure which illustrates the shape of the opening part of the permeation | transmission member of this embodiment. The figure explaining the pupil division of this embodiment.

  Hereinafter, embodiments for carrying out the present invention will be described in detail. The embodiment described below is an example for realizing the present invention, and should be appropriately modified or changed according to the configuration and various conditions of the apparatus to which the present invention is applied. It is not limited to the embodiment. Moreover, you may comprise combining suitably one part of each embodiment mentioned later.

  The image pickup device and the image pickup apparatus of the present invention are particularly useful for a digital video camera and a digital still camera (hereinafter referred to as a camera), and use an image pickup device in which a microlens is formed on each pixel arranged two-dimensionally. Focus detection is performed by the pupil division phase difference method.

  [Apparatus Configuration] With reference to FIG. 1, the configuration of a camera according to an embodiment of the present invention will be described. In the camera of this embodiment, a camera body having an image sensor and an imaging optical system are integrated, and a moving image and a still image can be recorded.

  In FIG. 1, reference numeral 101 denotes a first lens group disposed at the tip of the 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 (hereinafter referred to as “aperture”), which adjusts the light amount at the time of shooting by adjusting the aperture area, 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 102 and the second lens group 103 are integrally driven in the optical axis direction, and realize a zooming function (zoom function) in conjunction with 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 a CMOS image sensor (hereinafter referred to as an image sensor) composed of a CMOS image sensor and its peripheral circuits.

  Reference numeral 111 denotes a zoom actuator that drives a first lens group 101 to a third lens group 103 in the optical axis direction by rotating a cam cylinder (not shown) manually or by an actuator, thereby realizing a zoom function. Reference numeral 112 denotes an aperture actuator that controls the aperture area of the aperture 102 to adjust the amount of photographing light and controls the exposure time during still image shooting. A focus actuator 114 adjusts the focus by driving the third lens group 105 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 (autofocus) auxiliary light source, which projects a mask image having a predetermined aperture pattern onto a subject field via a projection lens, thereby improving the focus detection capability for a dark subject or a low-contrast subject. .

  Reference numeral 121 denotes a CPU, which has a calculation unit, ROM, RAM, A / D converter, D / A converter, communication interface circuit, and the like to manage various controls of the camera body. The CPU 121 drives various circuits included in the camera based on a predetermined program stored in the ROM, and executes a series of operations such as AF, photographing, image processing, and recording.

  Reference numeral 122 denotes an electronic flash control circuit that controls lighting of the illumination device 115 in synchronization with the photographing operation.

  An auxiliary light source driving circuit 123 controls lighting of the AF auxiliary light source 116 in synchronization with the focus detection operation.

  An image sensor driving circuit 124 controls the imaging operation of the image sensor 107, converts an analog image signal acquired from the image sensor 107 into a digital signal, and outputs the digital signal to the CPU 121. An image processing circuit 125 performs processing such as γ conversion, color interpolation, and image compression of the image signal acquired from the image sensor 107 to generate digital image data.

  A focus driving circuit 126 drives a focus actuator 114 based on a focus detection result described later, and drives the third lens group 105 in the optical axis direction to perform focus adjustment.

  Reference numeral 128 denotes an aperture driving circuit that drives the aperture actuator 112 to adjust the aperture area of the aperture 102.

  A zoom drive circuit 129 drives the zoom actuator 111 in response to a zoom operation via the operation switch 132 by 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 when focus is detected, and the like.

  An operation switch group 132 includes a power switch, a shutter switch, a zoom operation switch, a shooting mode selection switch, and the like.

  Reference numeral 133 denotes a flash memory that can be attached to and detached from the camera body, and records photographed image data.

  [Configuration of Image Sensor] Next, the pixel arrangement of the image sensor of this embodiment will be outlined with reference to FIG.

  FIG. 2 shows the pixel array of the image sensor of the present embodiment in a range of 20 columns × 20 rows. As shown in FIG. 2, the image pickup device of the present embodiment is composed of a rectangular pixel group in which M pixels in the horizontal direction and N pixels in the vertical direction are two-dimensionally arranged, and high-resolution image data can be acquired. It has become.

  A pixel group 200 of 2 rows × 2 columns shown in FIG. 2 includes a color filter (G) having a spectral transmittance of G (green) on the upper left side of a pixel 200R in which a color filter having a spectral transmittance of R (red) is arranged. A pixel 200G on which a transmission member (to be described later) is arranged is arranged on the upper right and lower left, and a pixel 200B on which a color filter having a spectral transmittance of B (blue) is arranged on the lower right. Further, the 2 × 2 focus detection pixel group 210 (220, 230, 240, 250) shown in FIG. 2 has an image pickup in which a color filter having a spectral transmittance of G is arranged in the upper right and lower left pixels. Pixel 210G (220G, 230G, 240G, 250G), first focus detection pixel 210SA (220SA, 230SA, 240SA, 250SA) in which a transmissive member having a white (W) spectral transmittance is arranged on the upper left, and right A second focus detection pixel 210SB (220SB, 230SB, 240SB, 250SB) in which a transmissive member having a white (W) spectral transmittance is disposed is disposed below. In the present embodiment, the color filter is included in the transmissive member. As will be described later, the focus detection pixel is designed to receive a light beam that passes through a pupil partial region, which is a partial region, by a light shielding layer. Therefore, a transmissive member having a large spectral transmittance is disposed to maintain light receiving sensitivity. It is common to be done.

  [Pixel Configuration] Next, the configuration of the focus detection pixel group 230 will be described with reference to FIGS.

  FIG. 3A is a plan view of one first focus detection pixel 230SA of the image sensor shown in FIG. 2 viewed from the light receiving surface side (+ z side) of the image sensor, and FIG. It is aa sectional drawing of (a). FIG. 4A is a plan view of one second focus detection pixel 230SB of the image sensor shown in FIG. 2 as viewed from the light receiving surface side (+ z side) of the image sensor, and FIG. It is bb sectional drawing of Fig.4 (a). 5A is a plan view of one imaging pixel 230G of the imaging device shown in FIG. 2 as viewed from the light receiving surface side (+ z side) of the imaging device, and FIG. 5B is a plan view of FIG. It is cc sectional drawing of).

  As illustrated, the first focus detection pixel 230SA, the second focus detection pixel 230SB, and the imaging pixel 230G have a pin structure in which an n-intrinsic layer 302 is sandwiched between a p-type layer 300 and an n-type layer 301. A photoelectric conversion unit (hereinafter referred to as a photodiode (PD)) is formed. The PD region is a depletion layer formed in the n-intrinsic layer 302 and a region extending around the depletion layer by a diffusion distance of minority carriers, and is generally a region in which the n-intrinsic layer 302 and the n-type layer 301 are combined. And overlap. If necessary, the n-intrinsic layer 302 may be omitted to form a pn junction PD.

  A microlens 305 for collecting incident light is formed on the light receiving side of each pixel.

  In the first focus detection pixel 230SA shown in FIG. 3, a first light shielding layer 330a having a first opening 331a is formed between the microlens 305 and the PD, and the first light shielding layer 330a has a first center with respect to the center of gravity of the light receiving surface of the PD. The center of gravity of the opening 331a is decentered in the −x direction.

  On the other hand, in the second focus detection pixel 230SB shown in FIG. 4, a second light shielding layer 330b having a second opening 331b is formed between the microlens 305 and the PD, and the center of gravity of the light receiving surface of the PD is The center of gravity of the second opening 331b is decentered in the + x direction. Thus, the center of gravity of the first opening 331a of the first light shielding layer 330a is different from the center of gravity of the second opening 331b of the second light shielding layer 330b. In addition, the average value of the center of gravity of the first opening 331a of the first light shielding layer 330a and the center of gravity of the second opening 331b of the second light shielding 330b is configured to substantially coincide with the center of gravity of the light receiving surface of the PD.

  In the imaging pixel 230G shown in FIG. 5, a light shielding layer 330c having an opening 331c is formed between the microlens 305 and the PD, and the center of gravity of the light receiving surface of the PD and the center of gravity of the opening 331c are configured to match. The

  In FIGS. 12A and 12B, 400 is an exit pupil of the imaging optical system, 500 is a pupil intensity distribution (pupil region) of the imaging pixel 230G, and 530a is a pupil intensity distribution (first) of the first focus detection pixel 230SA. (Pupil partial area) 530b is the pupil intensity distribution (second pupil partial area) of the second focus detection pixel 230SB. The light flux from the subject passes through the exit pupil 400 of the imaging optical system and enters each pixel.

  The pupil region 500 of the imaging pixel 230G in FIG. 12C is generally in a conjugate relationship with the light receiving surface of the PD and the microlens 305, and is a pupil region that can be received by the imaging pixel 230G. In this case, the pupil distance is several tens of mm, whereas the diameter of the microlens 305 is several μm. Therefore, the aperture value of the microlens 305 becomes several tens of thousands, resulting in diffraction blur of several tens of mm. Therefore, the image of the light receiving surface of the PD does not become a clear area but has a light receiving rate distribution.

  The pupil region 500 of the imaging pixel 230G is as large as possible so that more light flux that has passed through the exit pupil 400 of the imaging optical system can be received, and the center of gravity of the pupil region 500 is imaged optically at a predetermined pupil distance. The optical axis of the system is generally coincident.

  The first pupil partial region 530a of the first focus detection pixel 230SA in FIG. 12A is generally formed by the first opening 331a in which the center of gravity of the first light shielding layer 330a is eccentric in the −x direction and the microlens 305. , In a conjugate relationship. Thus, the first pupil partial region 530a is a pupil partial region that can be received by the first focus detection pixel 230SA. The first pupil partial region 530a of the first focus detection pixel 230SA is smaller than the pupil region 500 of the imaging pixel 230G, and the center of gravity is eccentric to the + X side on the pupil plane.

  The second pupil partial region 530b of the second focus detection pixel 230SB of FIG. 12B is roughly constituted by the second opening 331b in which the center of gravity of the second light shielding layer 330b is decentered in the + x direction and the microlens 305. It is a conjugate relationship. Thus, the second pupil partial region 530b is a pupil region that can be received by the second focus detection pixel 230SB. The second pupil partial region 530b of the second focus detection pixel 230SB is smaller than the pupil region 500 of the imaging pixel, and the center of gravity is decentered on the −X side on the pupil plane.

  Since the center of gravity of the first pupil partial region 530a of the first focus detection pixel 230SA and the center of gravity of the second pupil partial region 530b of the second focus detection pixel 230SB are different, they are decentered in the opposite direction. Thereby, the exit pupil 400 of the imaging optical system can be divided into pupils in the X direction. Similarly, when the center of gravity of the first opening 331a of the first light shielding layer 330a is decentered in the -y direction and the center of gravity of the second opening 331b of the second light shielding layer 330b is decentered in the + y direction, the imaging optical system The exit pupil 400 can be divided in the Y direction.

  In this embodiment, the center of gravity of the first pupil partial region 530a and the center of gravity of the second pupil region 530b are made different, and the average of the center of gravity of the first pupil partial region 530a and the center of gravity of the second pupil region 530b is determined as a predetermined pupil distance. Thus, the center of gravity of the pupil region 500 is substantially matched.

  The imaging device of the present embodiment described above includes a plurality of imaging pixels that receive a light beam that passes through a pupil region of the imaging optical system, and a plurality of focal points that receive a light beam that passes through a pupil partial region that is a partial region of the pupil region. The detection pixel is configured so that the center of gravity of the pupil region and the center of gravity of the pupil partial region are different. Since the light beam that has passed through only the partial region is received by the PD due to the light shielding layer and the amount of light received by the PD is reduced, the transmission member of the focus detection pixel is a transmission member having a large spectral transmittance or a material that does not absorb light. It is desirable to consist of

  In the present embodiment, the focus detection pixels 230SA and 230SB shown in FIGS. 3 and 4 are provided with two transmission members 340a and 340b having different spectral transmittances. That is, in the present embodiment, a transmissive member having a plurality of different spectral transmittances is arranged in the focus detection pixel. The transmissive member 340b is desirably a transmissive member having a large spectral transmittance so that the light receiving rate does not decrease. Furthermore, in this embodiment, in order to simplify the manufacturing process without increasing the number of photolithography processes for forming the color filter, the transmissive member 340b is filled with the same members as the upper and lower members of the transmissive member 340b. Composed.

  On the other hand, the transmission member 340a has a smaller spectral transmittance than the transmission member 340b or the same spectral transmittance as that of the adjacent pixel in order to suppress the amount of crosstalk to the adjacent pixel due to the oblique incident light. The spectral transmittance is the same as that of the adjacent pixel (second adjacent pixel).

  In FIG. 3A and FIG. 4A, the opening filled with the transmission member 340b in the transmission member 340a has a quadrangular shape as shown in FIG. 11A, but as shown in FIG. 11B. A circular shape may be used.

  FIG. 10 shows an example of the light intensity distribution in the focus detection pixel when light enters parallel to the optical axis of the microlens. Here, P is the pixel period, f is the focal length of the microlens, d is the aperture diameter of the opening of the transmissive member, h is the distance between the transmissive member and the microlens focal position, and H is the principal point of the microlens. The opening diameter d of the opening 340b of the transmissive member 340a in FIGS. 3 and 4 is generally expressed by an expression (not shown) so that the light receiving sensitivity of the focus detection pixel does not decrease when light enters parallel to the optical axis of the microlens. It is desirable to configure so as to satisfy the condition 1). In an example in which the pixel period P is 4.3 μm, the focal length f of the microlens is 6.5 μm, and the distance h between the transmitting member and the microlens focal position is 3.9 μm, the opening diameter d of the opening of the transmitting member is 2. 73 μm.

d = h / √ {(f / p) ² −1/4} (1)
The opening 340b of the transmissive member 340a in FIGS. 3 and 4 is formed from the optical axis in accordance with the amount of eccentricity from the optical axis of the openings 331a and 331b of the light shielding layer 330a in FIG. 3 (the light shielding layer 330b in FIG. 4). You may make it eccentric.

  For comparison, a conventional configuration will be described with reference to FIGS.

  8A is a plan view of a conventional CMOS image sensor in which a G image pickup pixel and an R image pickup pixel are adjacent to each other, and FIG. 8B is a dd cross section of FIG. 8A and is incident on the R image pickup pixel. An example of the light intensity distribution inside the pixel when light is incident obliquely is shown. On the other hand, FIG. 9A is a plan view of a conventional CMOS image sensor in which an imaging pixel and a white (W) focus detection pixel are adjacent to each other, and FIG. 9B is an ee cross section of FIG. 4 shows an example of an optical path of light rays (arrows in the drawing) inside the pixel when incident light is incident on the W focus detection pixel obliquely. 340G, 340W, and 340R in FIGS. 8 and 9 are transmissive members, and generally color filters that conform to the rules of the Bayer arrangement are arranged. Comparing FIG. 8B and FIG. 9B, the crosstalk light amount to the adjacent pixels due to the oblique incident light is larger in FIG. 9B. As described above, since the configuration of the focus detection pixel is different from the configuration of the photographing pixel, the crosstalk light amount from the focus detection pixel to the adjacent pixel due to the oblique incident light and the crosstalk light amount from the photographing pixel to the adjacent pixel are increased. It will be different.

  [Explanation of Effects] Next, effects of the present embodiment will be described with reference to FIG.

  FIG. 7 is a cross-sectional view of an imaging device in which the imaging pixel and the focus detection pixel of this embodiment are adjacent to each other, and shows an example of the light intensity distribution inside the pixel when incident light is incident obliquely.

  As shown in FIG. 7, the spectral transmittance of the transmissive member 340a of the focus detection pixel is the same as the spectral transmittance of the R color filter of the second adjacent pixel (two adjacent R imaging pixels), and the transmissive member The spectral transmittance of 340b is white (W). In the focus detection pixel of the present embodiment, the transmissive member 340a in the peripheral portion is configured to have a small spectral transmittance in the visible region, and the transmissive member 340b in the central portion is configured to have a large spectral transmittance in the visible region. In addition, a part of the transmission member of the focus detection pixel (opening) has a spectral transmittance in the visible region larger than that of the imaging pixel in order to maintain the light receiving sensitivity of the focus detection pixel.

  With the configuration of the present embodiment, crosstalk light to adjacent pixels due to obliquely incident light that occurred in the conventional example of FIG. 9B is absorbed and reduced by the transmissive member 340a having a small visible spectral transmittance. When the configuration of FIG. 7 is compared with the conventional example of FIG. 9B, the amount of crosstalk from the focus detection pixel to the adjacent pixel is reduced by the configuration of FIG. Difference due to the amount of crosstalk light to adjacent pixels is reduced.

  As described above, according to the present embodiment, it is possible to reduce the difference between the crosstalk light amount from the focus detection pixel to the adjacent pixel and the crosstalk light amount from the photographing pixel to the adjacent pixel due to the oblique incident light.

  In order to further reduce the difference between the crosstalk light amount from the focus detection pixel to the adjacent pixel and the crosstalk light amount from the imaging pixel to the adjacent pixel, the spectral transmittance of the transmission member 340a of the focus detection pixel It is desirable that the transmission member is set in accordance with the arrangement of the transmissive members (for example, Bayer arrangement) and is equal to the spectral transmittance of the transmissive member of the second adjacent pixel (two adjacent pixels).

  In addition, as illustrated in FIG. 6, a configuration may be adopted in which part of the transmission member 340 a of the focus detection pixel overlaps the transmission member 340 of the adjacent imaging pixel.

  In order to simplify the manufacturing process, the spectral transmittance of the transmissive member 340 of the imaging pixel adjacent to the focus detection pixel may be equal to the spectral transmittance of the transmissive member 340b of the focus detection pixel.

  As described above, according to the present embodiment, it is possible to reduce the difference between the crosstalk light amount from the focus detection pixel to the adjacent pixel and the crosstalk light amount from the photographing pixel to the adjacent pixel due to the oblique incident light.

Claims (12)

A plurality of imaging pixels for receiving a light beam passing through a pupil region of the imaging optical system;
A plurality of focus detection pixels that receive a light beam including a predetermined wavelength component that passes through a pupil partial region that is a partial region of the pupil region;
An imaging device in which the center of gravity of the pupil region and the center of gravity of the pupil partial region are different,
A transmission member capable of transmitting the luminous flux having a plurality of different spectral transmittances in the predetermined wavelength component is disposed in the focus detection pixel;
The imaging device, wherein the transmission member is configured such that a spectral transmittance of a peripheral portion adjacent to the imaging pixel in the predetermined wavelength component is smaller than a spectral transmittance of a central portion.   The imaging element according to claim 1, wherein the transmission member having the spectral transmittance of the central portion is configured by the same member as the upper and lower members of the transmission member.   The image sensor according to claim 1, wherein the spectral transmittance of the central portion is white spectral transmittance.   4. The image sensor according to claim 1, wherein the spectral transmittance of the peripheral portion has the same spectral transmittance as that of a transmissive member of an imaging pixel adjacent to the focus detection pixel.   The imaging element according to claim 4, wherein a part of the transmission member of the focus detection pixel overlaps a transmission member of an imaging pixel adjacent to the focus detection pixel.   2. The spectral transmittance of the peripheral portion is set in accordance with the arrangement of the transmissive members of the entire image sensor, and has the same spectral transmittance as that of the transmissive members of the two adjacent pixels adjacent to each other. 4. The imaging device according to any one of items 1 to 3. The focus detection pixels include a first focus detection pixel and a second focus detection pixel,
Decentering the centroid of the first pupil partial region of the first focus detection pixel and the centroid of the second pupil partial region of the second focus detection pixel in opposite directions with respect to the optical axis;
7. The center of gravity of the first pupil partial region and the center of gravity of the second pupil partial region are averaged at a predetermined pupil distance to match the center of gravity of the pupil region. The imaging device according to any one of the above. The imaging device according to any one of claims 1 to 7,
Focus detection means for performing focus detection using a signal from the focus detection pixel;
An imaging apparatus comprising: control means for controlling the imaging optical system so as to be in a focused state in accordance with a detection result by the focus detection means.   9. The imaging apparatus according to claim 8, wherein the focus detection unit performs pupil division phase difference type focus detection using the focus detection pixels.   An imaging device having a plurality of imaging pixels that receive a light beam passing through a pupil region of an imaging optical system, and focus detection pixels in the vicinity of the imaging pixels,
  A color filter having a spectral transmittance in a predetermined wavelength component is disposed in the imaging pixel,
  A first transmissive member having a spectral transmittance different from that of the color filter in the predetermined wavelength component in the focus detection pixel, and an image of the vicinity of the focus detection pixel in a peripheral portion of the first transmissive member An image pickup device comprising: a second transmission member that substantially matches a spectral transmittance of a color filter of a pixel.   The imaging device according to claim 10, wherein an imaging pixel in the vicinity of the focus detection pixel is adjacent to the focus detection pixel.   The imaging device according to claim 10, wherein an imaging pixel in the vicinity of the focus detection pixel is positioned next to the focus detection pixel.

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