JP2020020688A - Distance measuring device and imaging device - Google Patents

Abstract

To provide a distance measuring device and an imaging device with which it is possible to maintain focusing accuracy even when exposed to an ambient change such as temperature or humidity and an external force.SOLUTION: Provided is a distance measuring device for imaging a subject from different viewpoints using imaging optical systems CA, CB of the same structure, each having two reflection members, in each of image readout areas SA, SB of an imaging element 18 and acquiring the distance to the subject, the distance measuring device comprising: a prism holding frame 101 for integrally holding prisms 11a, 11b arranged on the subject side of each of the reflection members held by each of the imaging optical systems CA, CB; a second lens holding frame 102 for integrally holding triangle mirror reflection surfaces 15a, 15b arranged on the imaging element side of each of the reflection members held by each of the imaging optical systems CA, CB; and a screw unit 101a for joining the prism holding frame 101 to the second lens holding frame 102 at a neutral line OC of these.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a ranging device and an imaging device, and more particularly to a ranging device that obtains a subject distance, and an imaging device that includes the ranging device separately from an imaging optical system that obtains an image.

  2. Description of the Related Art Conventionally, in a digital camera, an image is acquired while changing a focus position of an imaging optical system, and an autofocus by a contrast AF method is used in which a focus position at which the contrast of the acquired image is maximized is set as a focus position. Are known. The autofocus by the contrast AF method has a high focusing accuracy, but the processing is slow because the focus position of a photographing optical system for acquiring an image (hereinafter, referred to as a “main imaging optical system”) needs to be changed. In addition, it may not be possible to properly perform focusing on a subject that is largely out of the depth of field range of the main imaging optical system. These problems are particularly remarkable in the case of a telephoto lens having a relatively shallow depth of field.

  In order to solve such a problem, there is known an image pickup apparatus using autofocus by a phase difference AF method for calculating a focus position of an image pickup optical system to be a focus position according to a subject distance acquired by a distance measuring device provided therein. I have. Here, the distance measuring device is a device having two image pickup optical systems different from the main image pickup optical system (hereinafter, referred to as “second two image pickup optical systems”). The subject distance is calculated from the principle of triangulation. Further, the two subordinate imaging optical systems include a reflecting member (for example, a prism) that bends the optical axis, and guides the subject image formed by each to a single imaging device unit, thereby reducing the size of the distance measuring device. Also, a technique for reducing the cost is known.

  Patent Literature 1 discloses a finder device in which a range finder and a distance measuring device (autofocus unit) are combined, and respective entrance windows are integrated. Patent Literature 2 discloses an imaging device that includes a main imaging optical system and a distance measurement device (distance measurement optical system) and acquires a distance map image using the distance measurement optical system.

JP-A-9-43682 JP 2013-42379 A

  However, in the autofocus by the phase difference AF method, when the subject distance is acquired using the two subordinate imaging optical systems, the subject located outside the range of the respective depths of field is not subject to the subject distance. Calculation accuracy decreases. From this viewpoint, it is desirable that the focal lengths of the two subordinate imaging optical systems be short in order to increase the depth of field. However, in order to calculate the subject distance with high resolution, the length of a straight line (hereinafter, referred to as “baseline length”) connecting the centers of the entrance pupils of the two subordinate imaging optical systems or the focal length of each of them must be increased. There is a need to. That is, in order to increase the depth of field of each of the two subordinate imaging optical systems, it is preferable to increase the base line length instead of shortening the respective focal lengths.

  It is generally known that when the positional relationship between two subordinate imaging optical systems changes due to an external impact or environmental change, the calculation accuracy of the subject distance and, consequently, the focusing accuracy greatly decrease. However, there is no mention in Patent Documents 1 and 2 about measures against external impacts and environmental changes. This measure is particularly important when the base line length is increased in order to increase the depth of field of each of the two subordinate imaging optical systems.

  That is, the autofocus unit of Patent Document 1 has a configuration in which each of the two subordinate imaging optical systems includes a reflecting member and an objective lens, and guides a subject image formed by the two objective lenses to a single imaging element unit. . In addition, in order to make the base line length of the autofocus unit having such a configuration equal to the base line length of the range finder, the sum of the focal lengths of the respective objective lenses is substantially set to the base line length. Therefore, even if the focal length of each objective lens is shortened, the base line length cannot be lengthened by the autofocus unit of Patent Literature 1, and a reduction in focusing accuracy due to an external impact or environmental change is considered in Patent Literature 1. It has not been.

  On the other hand, Patent Literature 2 discloses that a distance map image is acquired by using two subordinate imaging optical systems of a distance measuring device. However, the specific configuration of each of the two subordinate imaging optical systems and each of them is described. There is no mention of a method of increasing the base line length while shortening the focal length of the lens.

  Therefore, an object of the present invention is to provide a distance measuring device and an imaging device that can maintain focusing accuracy even when environmental changes such as temperature and humidity or external forces are applied.

  A distance measuring apparatus according to a first aspect of the present invention uses a first and a second imaging optical system each including two reflecting members to convert a subject from different viewpoints into a first and a second image reading area of an imaging element. In the distance measuring apparatus that captures an image and obtains a subject distance, the first and second imaging optical systems each include a first reflection member that is disposed on a side of the subject among the reflection members that are included in the first and second imaging optical systems. A first holding frame for integrally holding, and a second reflecting member arranged on the side of the image sensor among the reflecting members included in each of the first and second imaging optical systems are integrally formed. And a connecting portion for connecting the first holding frame to the second holding frame at a neutral line of the second holding frame.

  The imaging device according to claim 10 of the present invention is an imaging device in which the distance measuring device is incorporated, and the third imaging optical system uses the third imaging optical system based on the subject distance acquired by the distance measuring device. It is characterized in that a focus is adjusted when an object is imaged by an image sensor having a higher resolution than the image sensor.

  According to the present invention, focusing accuracy can be maintained even when environmental changes such as temperature and humidity or external forces are applied.

FIG. 4 is a diagram illustrating a method of calculating a subject distance in the distance measuring apparatus according to the embodiment of the present invention. FIG. 2 is a diagram for describing a method of acquiring coordinates of corresponding pixels for acquiring a parallax amount from two subject images captured using the two imaging optical systems in FIG. 1. FIG. 2 is a diagram illustrating a hardware configuration of a distance measuring device used for calculating a subject distance in FIG. 1. It is sectional drawing of the distance measuring device of FIG. FIG. 4 is an exploded perspective view of the distance measuring device of FIG. 3. FIG. 4 is an exploded perspective view of an image sensor unit including the image sensor in FIG. 3. FIG. 5 is a diagram illustrating an imaging device in which the distance measuring device of FIG. 4 is incorporated.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  With reference to FIG. 1, a method for acquiring a subject distance using two imaging optical systems will be described.

  FIG. 1 is a diagram illustrating a method of calculating a subject distance in a distance measuring apparatus according to an embodiment of the present invention.

  In FIG. 1, the distance measuring apparatus has two imaging optical systems CA and CB having the same structure, and one imaging element that captures an optical image formed by these as an object image in image reading areas SA and SB, respectively.

  Hereinafter, a case will be described in which the subject distance in the case where the subject Obj existing at one point in the shooting scene is imaged in the image readout areas SA and SB using the two imaging optical systems CA and CB. Note that the x-axis is on a plane where the entrance pupils of the imaging optical systems CA and CB are located, passes through the centers of the respective entrance pupils, and the distance from each of the entrance pupil centers is D / 2. Use the origin. On the other hand, the z-axis is an axis that passes through the origin and extends in a direction parallel to the optical axes of the imaging optical systems CA and CB. That is, the center of the entrance pupil of each of the imaging optical systems CA and CB exists at (−D / 2, 0) and (D / 2, 0). Here, the focal length of each of the imaging optical systems CA and CB is set to f, and the corresponding pixel P1 that records light from the subject Obj existing at (x, z) in each of the image readout areas SA and SB of one image sensor. , P2 are -D / 2-a and D / 2 + b. In this case, the following equation (1) holds.

  In Expression (1), ba is a displacement on the imaging surface when the same subject is imaged from different viewpoints, that is, an amount of parallax (amount of parallax). If the parallax amount ba can be obtained, the object distance z can be obtained by substituting the parallax amount ba, the focal length f of each of the imaging optical systems CA and CB, and the base line length D into Expression (1). Can be calculated.

  Next, referring to FIG. 2, a method of acquiring coordinates of corresponding pixels for acquiring a parallax amount from two subject images IMG1 and IMG2 captured using two imaging optical systems CA and CB in FIG. explain.

  In FIG. 2, subject images IMG1 and IMG2 are images obtained by capturing a subject from different viewpoints using the two imaging optical systems CA and CB in the image readout areas SA and SB of one imaging device.

  Hereinafter, on the image sensor including the image readout areas SA and SB, the center (not shown) is the origin, the horizontal direction in FIG. 2 is the X axis, the vertical direction is the Y axis, and the pixel value of the subject image IMG1 is Is described as F1 (X, Y) and the pixel value of the subject image IMG2 is F2 (X, Y).

  The coordinates (X2, Y2) of the corresponding pixel P2 of FIG. 1 in the subject image IMG2 corresponding to the coordinates (X1, Y1) of the corresponding pixel P1 of FIG. 1 in the subject image IMG1 can be obtained as follows. First, a pixel value F1 (X1, Y1) in the subject image IMG1 is detected. Next, a pixel value F2 (X2, Y2) most similar to the detected pixel value F1 (X1, Y1) is searched from the subject image IMG2. Thereafter, the coordinates (X2, Y2) of the corresponding pixel P2 are obtained from the searched pixel value F2 (X2, Y2).

  In the following description, the corresponding point and the corresponding pixel on the subject images IMG1 and IMG2 have the same meaning. However, it is generally difficult to search a pixel value most similar to a pixel value of an arbitrary pixel in one image from another image. For this reason, in such a search, a method called a block matching method using not only the pixel value of an arbitrary corresponding pixel P1 but also the pixel values of neighboring pixels may be used. Thus, the coordinates of the corresponding pixels of the two subject images IMG1 and IMG2 can be reliably obtained, and the amount of parallax can be calculated.

  As described above, the coordinates of the corresponding pixels of the two subject images captured using the two imaging optical systems are obtained, the parallax amount is calculated from the obtained coordinates, and the subject distance is calculated based on the parallax amounts. can do.

  When acquiring the coordinates of the corresponding pixel, it is preferable that the two subject images used are sharp images that are in focus. That is, when capturing these two subject images, it is preferable that the subject be within the respective depths of field of the two imaging optical systems. This is because when the subject is blurred, a pixel value of an erroneous pixel different from the true corresponding pixel may be searched for as a pixel value of the corresponding pixel, and as a result, an erroneous subject distance may be calculated. is there.

  Subsequently, a detailed configuration of the distance measuring device according to the present invention will be described with reference to FIGS.

  FIG. 3 is a diagram showing a hardware configuration of a distance measuring device used for calculating the subject distance in FIG.

  FIG. 3A is an overall configuration diagram of the distance measuring device.

  As shown in FIG. 3A, the distance measuring device includes two imaging optical systems CA and CB, and an imaging element 18.

  The imaging optical system CA includes one prism 11a, three lenses 12a to 14a, and a triangular mirror reflecting surface 15a. Similarly, the imaging optical system CB includes one prism 11b, three lenses 12b to 14b, and a triangular mirror reflecting surface 15b. As shown in FIG. 3, the triangular mirror reflecting surfaces 15a and 15b indicate surfaces of the triangular mirror 15 disposed between the lenses 14a and 14b, respectively, facing the lenses 14a and 14b. The triangular mirror 15 is a triangular component in which the triangular mirror reflecting surfaces 15a and 15b are mirror-deposited with a synthetic resin such as acrylic. Note that the two imaging optical systems CA and CB are single focus optical systems. The distance measuring apparatus according to the embodiment of the present invention is designed with a 35 mm equivalent focal length of 400 mm. For this reason, the optical sensitivity of the prisms 11a and 11b and the triangular mirror 15 is high, and there is a possibility that the two subject images IMG1 and IMG2 captured using the two imaging optical systems CA and CB may be shifted due to slight inclination. In FIG. 3A, the optical axes OA and OB of the imaging optical systems CA and CB are indicated by alternate long and short dash lines, respectively. At this time, the distance between the intersection of the optical axis OA and the prism 11a and the intersection of the optical axis OB and the prism 11b corresponds to the base length D of the distance measuring device.

  The optical axis OA of the imaging optical system CA is bent 90 degrees by the prism 11a and 90 degrees by the triangular mirror reflection surface 15a on the XZ plane in FIG. 1, and enters the image reading area SA of the imaging element 18. That is, each of the prism 11a and the triangular mirror 15 bends the optical axis OA of the imaging optical system CA by 90 degrees. Similarly, the prism 11b and the triangular mirror reflecting surface 15b each bend the optical axis OB of the imaging optical system CB by 90 degrees and make the optical axis OB enter the image reading area SB of the imaging element 18. The imaging optical systems CA and CB have the same configuration as each other, and are arranged so as to rotate with respect to a straight line passing through the center of the imaging element 18 and parallel to the Z axis.

  By combining two reflecting members that bend the optical axes OA and OB twice as described above, when the subject images IMG1 and IMG2 formed by the two imaging optical systems CA and CB are captured by one imaging element 18, However, a long base line length can be realized. This is because the base line length corresponds to the distance between the centers of the lenses closest to the line connecting the centers of the entrance pupils of the two imaging optical systems CA and CB. In other words, the reflecting member on the imaging element 18 side of each of the imaging optical systems CA and CB is a part formed integrally with mirror-deposited portions constituting the respective components, and has a shape like the triangular mirror 15. It does not have to be a simple triangle.

  FIG. 3B is a front view of the image sensor 18 to which the light of the subject is guided by the two image pickup optical systems CA and CB of the distance measuring device when viewed from the triangular mirror 15.

  In FIG. 3B, the base line length D is indicated by a dashed line. FIG. 3B shows an image circle ICa of the imaging optical system CA, an intersection OCa between the optical axis OA and the imaging device 18, and an image readout area SA of the imaging device 18. Similarly, FIG. 3B shows an image circle ICb of the imaging optical system CB, an intersection OCb between the optical axis OB and the imaging device 18, and an image reading area SB. As described above, the imaging optical systems CA and CB are arranged so that the straight line connecting the intersection points OCa and OCb and the base line length D are substantially horizontal to each other. The image sensor 18 is arranged such that its long side is substantially parallel to the base line length D and its short side is substantially perpendicular to the base line length D.

  The image readout areas SA and SB are pixel areas in the imaging device 18 where the subject images IMG1 and IMG2 formed by the imaging optical systems CA and CB are captured, respectively. Since pixels other than the pixel readout areas SA and SB among the pixels of the image pickup element 18 are not used, the image pickup element 18 may be configured such that the pixels exist only in the pixel readout areas SA and SB. Further, the image sensor 18 may have a configuration in which two pixel groups corresponding to the image readout areas SA and SB are formed on one circuit board. Thus, the distance between the two image readout areas SA and SB may be small with respect to the base line length D, and the form of the imaging element 18 can be arbitrarily changed.

  4 to 6 are views showing details of the mechanical configuration of the distance measuring apparatus according to the present invention.

  FIG. 4 is a sectional view of the distance measuring apparatus according to the present invention, and FIG. 5 is an exploded perspective view. FIG. 6 is an exploded perspective view of the image sensor unit 600 including the image sensor 18.

  As shown in FIGS. 4 and 5, the two prisms 11a and 11b are integrally held by a prism holding frame 101 (first holding frame). Although not shown, the two prisms 11a and 11b are fixed to the prism holding frame 101 by UV bonding. The lens 12a is held by the first lens holding frame 103a, and is fixed by UV bonding like the prism 11a. The lens 12b is similarly fixed to the first lens holding frame 103b by UV bonding. The lenses 13a, 13b, 14a, 14b and the triangular mirror 15 are held by the second lens holding frame 102 (second holding frame) on surfaces (mounting surfaces) other than the surfaces constituting the triangular mirror reflecting surfaces 15a, 15b. ing. Further, the mounting surface is fixed to the second lens holding frame 102 by UV bonding similarly to the prisms 11a and 11b.

  Next, the image sensor unit 600 will be described with reference to FIG.

  As shown in FIG. 6, the image sensor unit 600 includes an image sensor holder 104, an image sensor mask 106, a glass plate 17 coated with a coating for cutting infrared light, and an image sensor holding plate 105 for holding the image sensor 18. It consists of. Here, the imaging device mask 106 is a component that partitions the subject images IMG1 and IMG2 formed by the two imaging optical systems CA and CB so as not to interfere with each other.

  The image sensor 18 is fixed to the image sensor holding plate 105 by UV bonding. An image sensor holding plate 105 for integrally holding the image sensor 18 is fastened with screws to the image sensor holder 104 with the image sensor mask 106 and the glass plate 17 interposed therebetween.

  As shown in FIGS. 4 and 5, the first lens holding frames 103a and 103b are separate from the second lens holding frame 102, and the screw portions 203a and 203b of the first lens holding frames 103a and 103b and the second lens The screw portions 102a and 102b of the holding frame 102 are screwed and connected. The subject images IMG1 and IMG2 formed by the two imaging optical systems CA and CB are focused by the mounting errors of the lenses 12a, 12b, 13a, 13b, 14a and 14b and the triangular mirror 15 when the images are captured by the image sensor 18. There may be a difference in the condition. That is, even if a clear image is captured for one of the subject images IMG1 and IMG2, the other image may be blurred and an accurate subject distance may not be calculated. Therefore, the positions of the first lens holding frames 103a and 103b are adjusted by the screw portions 203a and 203b, and play a role of aligning the images captured by the two imaging optical systems CA and CB. After the position adjustment of the first lens holding frames 103a and 103b with respect to the second lens holding frame 102, the screw portions 203a and 203b and the screw portions 102a and 102b are fixed by UV bonding.

  As shown in FIGS. 4 and 5, the prism holding frame 101 and the image sensor unit 600 are fastened to the second lens holding frame 102. In the image pickup device unit 600, the positioning hole portion 104a and the rotation stop hole portion 104b are fitted to two shaft portions (not shown) of the second lens holding frame 102, and are fastened from the four hole portions 104c with screws (not shown). As a result, it is fixed to the second lens holding frame 102. Further, the prism holding frame 101 is similarly fastened to the second lens holding frame 102 with screws (not shown). The prism holding frame 101 and the second lens holding frame 102 are fastened to each other with three screw portions 101a (coupling portions) on the neutral line OC of the two imaging optical systems CA and CB shown in FIGS. In this embodiment, the number of the screws 101a is three, but the number may not be three as long as the prism holding frame 101 and the second lens holding frame 102 can be fastened on the neutral line OC. Here, the neutral line OC means a line coinciding with the z-axis in FIG.

  The prism holding frame 101 holds the two prisms 11a and 11b. However, since the two prisms 11a and 11b have high optical sensitivity, if the relative inclination slightly changes, the subject distance calculation accuracy deteriorates. For this reason, the prism holding frame 101 is made of a material having a small linear expansion coefficient so as not to be easily affected by changes in the external environment. For example, metal parts and glass parts are used. In addition, the thickness of the components forming the prism holding frame 101 is uniform so that the amount of change in the position of the two prisms 11a and 11b is the same even under the influence of the external environment. The shape is formed in a line symmetrical shape with respect to the neutral line OC in FIGS. Here, that the thickness is uniform means that an error of the thickness is less than 5%, and that the shape is line-symmetric with respect to the neutral line OC means that the error is from a line-symmetric position from the neutral line OC. It means that the error is less than 5%.

  The second lens holding frame 102 holds the triangular mirror 15. Therefore, when the triangular mirror 15 is tilted under the influence of the external environment, the positions of the two subject images IMG1 and IMG2 picked up by the image pickup device 18 from the two image pickup optical systems CA and CB also shift. However, since the triangular mirror reflecting surfaces 15a and 15b are integrally inclined, the imaging positions of the two subject images IMG1 and IMG2 on the imaging element 18 change, but the relative positional relationship does not change. Further, since the lens members 12 to 14 held by the second lens holding frame 102 are not so high in optical sensitivity, a slight displacement can be tolerated. Therefore, the second lens holding frame 102 may be formed of a generally used resin component such as polycarbonate. Therefore, in the distance measuring apparatus according to the embodiment of the present invention, the prism holding frame 101 is made of a material having a smaller linear expansion coefficient than the second lens holding frame 102.

  Here, the two prisms 11a and 11b have high optical sensitivity, and if the two prisms 11a and 11b are decentered, the two subject images IMG1 and IMG2 may protrude out of the image reading area, and thus image reading may not be performed. . Further, due to such eccentricity, the positions of the two subject images IMG1 and IMG2 may deviate from the initial positions, and it may be impossible to calculate the subject distance with high accuracy.

  In the configuration of the distance measuring apparatus according to the present invention, even if the material forming the prism holding frame 101 expands due to environmental changes such as temperature and humidity, the prism holding frame 101 is screwed with the screw 101a on the neutral line OC of the distance measuring apparatus. Since it is fastened, it expands from the screw portion 101a. Therefore, the two prisms 11a and 11b of the prism holding frame 101 are displaced by the same amount of movement. Further, there is a case where any one of the prism holding frame 101, the second lens holding frame 102, and the image sensor unit 600 is displaced by an external force. Also in such a case, since the prism holding frame 101, the second lens holding frame 102, and the image sensor unit 600 are integrally fastened, displacement occurs integrally with respect to an external force. As described above, in the distance measuring apparatus according to the present invention, when the positional displacement of the internal components occurs, the relative positions of the two subject images IMG1 and IMG2 formed on the image sensor 18 using the imaging optical systems CA and CB. Eliminate positional deviation. As a result, high subject distance calculation accuracy can be maintained.

  The range finder has been described above as an example, but the present invention is not limited to these embodiments, and various forms within the scope of the present invention are also included in the present invention. For example, as shown in FIG. 7, the imaging optical system CA, CB of the present invention is applied to an imaging device 700 for imaging an object with an imaging device (not shown) having a higher resolution than the imaging device 18 using the third optical system 10c. May be incorporated. This makes it possible to perform high-speed and high-accuracy focus adjustment of the subject based on the subject distance acquired by the distance measuring device.

  Further, in the present invention, the lens and the prism are fixed by UV bonding. However, a method of urging and fixing with a leaf spring or the like may be used, and is not limited to the method of the present invention. Further, the two imaging optical systems in the present invention are single focal length optical systems equivalent to 400 mm in 35 mm conversion, but may be variable magnification optical systems and the focal length is not limited to 400 mm. In the present invention, the lens position is adjusted with a screw in order to align the focus of the two imaging optical systems CA and CB. However, a mechanical configuration may be adopted in which a focusing lens is arranged to adjust the focus. .

  Further, in the present embodiment, the two imaging optical systems CA and CB have the same structure, but the present invention is not limited to this. In other words, if the prism holding frame 101, the second lens holding frame 102, and the image sensor unit 600 are integrally fastened and the position shifts integrally with external force, the two image pickup optical systems CA and CB are used. May have different structures.

CA, CB Image pickup optical system 11a, 11b Prism 15a, 15b Triangular mirror reflection surface SA, SB Image readout area 18 Image pickup device 101 Prism holding frame 101a Screw portion 102 Second lens holding frame OC neutral line

Claims (10)

A distance measuring apparatus that captures an image of a subject from different viewpoints in respective first and second image readout areas of an image sensor using first and second imaging optical systems each including two reflecting members, and acquires a subject distance. At
A first holding frame that integrally holds a first reflecting member disposed on the subject side among the reflecting members included in each of the first and second imaging optical systems;
A second holding frame that integrally holds a second reflecting member disposed on the image sensor side of each of the reflecting members included in each of the first and second imaging optical systems;
A coupling portion for coupling the first holding frame to the second holding frame at these neutral lines.   2. The distance measuring apparatus according to claim 1, wherein the second holding frame integrally holds the second reflection member and the image sensor provided in each of the first and second imaging optical systems. 3. apparatus.   The distance measuring apparatus according to claim 1, wherein the first holding frame has a smaller linear expansion coefficient than the second holding frame.   4. The distance measuring apparatus according to claim 1, wherein the first holding frame is formed in a line-symmetric shape with respect to the neutral line. 5.   The distance measuring apparatus according to claim 1, wherein the first holding frame has a uniform thickness.   The said 2nd reflection member with which each of the said 1st and 2nd image pick-up optical systems is provided is a part integrally comprised, and the part which comprises each is mirror-deposited. The distance measuring apparatus according to any one of claims 1 to 5.   7. The distance measuring apparatus according to claim 6, wherein the component is held by the second holding frame on a mounting surface other than the surface having the mirror-deposited portion.   The first and second imaging optical systems bend the optical axis by 90 degrees by the first and second reflection members provided respectively and make the optical axes enter the first and second image readout regions, respectively. The distance measuring apparatus according to any one of claims 1 to 7, wherein:   The distance measuring apparatus according to any one of claims 1 to 8, wherein the first and second imaging optical systems are single focus optical systems. An imaging device incorporating the distance measuring device according to any one of claims 1 to 9, using a third imaging optical system based on the subject distance acquired by the distance measuring device. An imaging apparatus for performing focus adjustment when imaging the subject with an imaging device having a higher resolution than the imaging device.

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