Lens device and imaging system

Abstract

To ensure a base line length on an object side, and on an image side, prevent rays of light from respective image circles of right and left optical systems brought into proximity to each other from mutually entering the other image circles.SOLUTION: A lens device 200 has a right eye optical system 201R and a left eye optical system 201L and is removably attached to an imaging apparatus. The interval between the optical axes of portions on an image side of the right eye and left eye optical systems is smaller than that between the optical axes of portions on an object side. The lens device has, on light paths directed to image surfaces from final lens surfaces on the most image side in the right eye and left eye optical systems, a light shielding wall 208e that blocks light directed to an image circle of the left eye optical system from the final lens surface of the right eye optical system and blocks light directed to an image circle of the right eye optical system from the final lens surface of the left eye optical system.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a lens device that is detachably attached to an imaging device. [Background technology]

[0002] As disclosed in Patent Documents 1 and 2, some interchangeable lens devices have left and right optical systems arranged in parallel such that their optical axes are spaced apart by a base line length corresponding to the interocular distance (e.g., 60 to 65 mm), and a subject image (image circle) is formed by each optical system on one or two left and right imaging elements. The subject images formed by the left and right optical systems are captured and recorded, and image data for the left eye and image data for the right eye are displayed on a stereoscopic display device such as a 3D display or virtual reality (VR) goggles, thereby presenting a stereoscopic image to a viewer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-003022 A [Patent Document 2] JP 2012-113281 A Summary of the Invention [Problem to be solved by the invention]

[0004] In order to fit the left and right optical systems described above into a lens mount of a diameter that can be attached to a typical interchangeable lens type imaging device while maintaining the baseline length between them, it is sufficient to bend each optical system, separate the object-side portions of the left and right optical systems by the baseline length, and bring the image-side portions closer to each other.

[0005] However, when the image side portions of the left and right optical systems are brought close to each other, light from each optical system may enter the image circle of the other optical system, causing a ghost image.

[0006] The present invention provides a lens device capable of preventing light from entering the image circles of left and right optical systems that are close to each other on the image side while ensuring a base length on the object side. [Means for solving the problem]

[0007] A lens device according to one aspect of the present invention has a right-eye optical system and a left-eye optical system, and is detachably attached to an imaging device. A lens mount and The distance between the optical axes of the image side portions of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object side portions. A light-shielding wall is provided between the optical paths from the final lens surface on the image side of each of the right-eye and left-eye optical systems toward the image surface, and blocks light from the final lens surface of the right-eye optical system toward the image circle of the left-eye optical system, and blocks light from the final lens surface of the left-eye optical system toward the image circle of the right-eye optical system. The final lens surface is disposed on the image side of the flange surface of the lens mount. It is characterized by:

[0009] An imaging system including an imaging device to which any of the above lens devices are detachably attached also constitutes another aspect of the present invention. Effect of the Invention

[0010] According to the present invention, it is possible to ensure the base length on the object side and to prevent light from the other from entering into the image circles of the left and right optical systems that are close to each other on the image side. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a plan sectional view of the stereoscopic imaging lens of the first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view of a right optical system in the stereoscopic imaging lens of the first embodiment. [Diagram 3] FIG. 2 is an exploded perspective view (front perspective view) of the stereoscopic imaging lens of the first embodiment. [Figure 4] FIG. 2 is an exploded perspective view (rear perspective view) of the stereoscopic imaging lens of the first embodiment. [Diagram 5]1A and 1B are a front sectional view and an enlarged view of a stereoscopic imaging lens of Example 1. [Figure 6] FIG. 3 is a diagram showing a mount cover of the stereoscopic imaging lens of the first embodiment. [Figure 7] 4 is a diagram showing the positional relationship between a third optical axis of the stereoscopic imaging lens of the first embodiment and an image circle on an imaging element. [Figure 8] FIG. 1 is a block diagram showing the configuration of a stereoscopic imaging lens and an imaging device according to a first embodiment. [Figure 9] FIG. 11 is a diagram showing the periphery of a mount cover of the stereoscopic imaging lens of the second embodiment. [Figure 10] FIG. 11 is a cross-sectional view of the periphery of a mount cover of the stereoscopic imaging lens of the second embodiment. [Figure 11] 11A to 11C are diagrams showing images acquired using the stereoscopic imaging lens of the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0013] Fig. 1 shows a cross section of a lens device (hereinafter referred to as a stereoscopic imaging lens) 200 according to a first embodiment of the present invention, as viewed from above. The stereoscopic imaging lens 200 is an interchangeable lens that is detachably attached to a camera body serving as an imaging device. Fig. 1 shows a grip portion 130 of the camera body that a user holds with his / her right hand.

[0014] The stereoscopic imaging lens 200 has a right-eye optical system 201R and a left-eye optical system 201L. When the stereoscopic imaging lens 200 is attached to a camera body, the image circles (subject images) of the right-eye optical system 201R and the left-eye optical system 201L are simultaneously formed in the right-side imaging region and the left-side imaging region on an imaging element provided in the camera body. The imaging element captures the subject images formed in the right-side and left-side imaging regions.

[0015] FIG. 2 shows an exploded view of the right-eye optical system 201R. The right-eye optical system 201R and the left-eye optical system 201L have the same configuration except that their optical axes are linearly symmetrical with respect to the central axis of the stereoscopic imaging lens 200. FIG. 3 and FIG. 4 show exploded views of the stereoscopic imaging lens 200 as viewed from the front and rear, respectively. In the following description, the reference numerals of the components of the right-eye optical system 201R are suffixed with R, and the reference numerals of the components of the left-eye optical system 201L are suffixed with L. Moreover, the reference numerals of the components common to both the right-eye optical system 201R and the left-eye optical system 201L are suffixed with neither R nor L.

[0016] The right-eye optical system 201R and the left-eye optical system 201L each have, in order from the object (subject) side to the image side, a first optical axis OA1, a second optical axis OA2 that is bent at a right angle from the first optical axis OA1 and extends, and a third optical axis OA3 that is bent at a right angle from the second optical axis OA2 and extends parallel to the first optical axis OA1. Each optical system has a first lens 211, a second lens 211-2, and a third lens 211-3 arranged along the first optical axis OA1, a fourth lens 221 arranged along the second optical axis OA2, and a fifth lens 231 and a sixth lens 231-2 arranged along the third optical axis OA3. Each optical system further has a first prism 220 that bends the second optical axis OA2 with respect to the first optical axis OA1, and a second prism 230 that bends the third optical axis OA3 with respect to the second optical axis OA2. The fourth lens 221 is disposed between the first prism 220 and the second prism 230 .

[0017] The first to third lenses 211, 211-2, and 211-3 form a first optical system (the object side portions of the right-eye and left-eye optical systems) having a first optical axis OA1, and the first prism 220, the fourth lens 221, and the second prism 230 form a second optical system having a second optical axis OA2 bent with respect to the first optical axis OA1. The fifth lens 231 and the sixth lens 231-2 form a third optical system (the image side portions of the right-eye and left-eye optical systems) having a third optical axis OA3 bent with respect to the second optical axis OA2.

[0018] Hereinafter, a description will be given of the configuration of the right-eye optical system 201R shown in Fig. 2. As described above, the configuration of the left-eye optical system 201L is basically the same as the configuration of the right-eye optical system 201R.

[0019] The first lens 211R is held by a first lens holding member 212R, and is pressed against the first lens holding member 212R by a pressing ring 215 fixed to the first lens holding member 212R. A dustproof member 216 is attached to the outer periphery of the pressing ring 215 to close the gap between the pressing ring 215 and cases 206a and 206b, which serve as exterior members to be described later.

[0020] The second lens 211-2R is held by a second lens holding member 218R. The third lens 211-3R is held by a first lens base 213R serving as a base member.

[0021] A first lens holding member 212R arranged on the outer periphery of the first lens base 213R (see FIG. 5(b)) is attached via two types of three eccentric rollers 214a and 214b so as to enable optical adjustment including eccentricity adjustment and inclination adjustment of the first lens 211R. The eccentric rollers 214a and 214b correspond to the first adjustment members for eccentricity adjustment and inclination adjustment, respectively. In this embodiment, the eccentricity adjustment of the lens refers to the correction of the deviation of the optical axis of the lens with respect to the first optical axis OA1 in the direction perpendicular to the first optical axis OA1, and the inclination adjustment refers to the correction of the inclination of the optical axis of the lens with respect to the first optical axis OA1.

[0022] Also, the first lens base 213R has a second lens holding member 218R (see FIG. 5(b)) disposed on its inner periphery attached via two types of three eccentric rollers 219a and 219b so as to enable optical adjustment including eccentricity adjustment and inclination adjustment of the second lens 211-2R. The eccentric rollers 219a and 219b correspond to the second adjustment members for eccentricity adjustment and inclination adjustment. In this embodiment, three eccentric rollers (214a, 214b, 219a, 219b) of the same type are disposed at three locations (multiple locations) at equal intervals of 120 degrees in the circumferential direction around the first optical axis OA1.

[0023] The eccentric rollers 214a, 214b, 219a, and 219b have eccentric parts that are eccentric with respect to their central axes. When an adjuster uses a tool to rotate (operate) the eccentric rollers 214a and 219a around their central axes, the lens holding members (212R and 218R) move in a direction perpendicular to the optical axis of the lens. When the eccentric rollers 214b and 219b are rotated around their central axes, the lens holding members (212R and 218R) move so that the inclination of the optical axis of the lens is adjusted. Such an optical adjustment mechanism makes it possible to perform optical adjustments (eccentricity adjustment and tilt adjustment) of the first and second lenses 211R and 211-2R.

[0024] The first prism 220R is assembled and bonded to the prism base 217R from the direction of the second optical axis OA2. A prism mask 224 is attached to the exit surface of the first prism 220R to block light rays outside the optical path. The prism base 217R is fixed to the first lens base 213R with screws (not shown).

[0025] The fourth lens 221R is attached and bonded to the fourth lens holding member 222R from the direction of the second optical axis OA2, and the second prism 230R is attached and bonded to the fourth lens holding member 222R from the direction of the third optical axis OA3. A prism mask 233 is attached to the exit surface of the second prism 230R to block light rays outside the optical path. The prism base 217R and the fourth lens holding member 222R hold the aperture unit 223R sandwiched between them. The prism base 217R is fixed to the fourth lens holding member 222R with screws.

[0026] The fifth lens 231R is held by a fifth lens holding member 232R, and the sixth lens 231-2R ​​is held by a sixth lens holding member 232-2R. The fifth and sixth lens holding members 232R, 232-2R are fixed to the fourth lens holding member 222 with screws.

[0027] The right-eye optical system 201R and the left-eye optical system 201L configured as above are fixed with screws to the right and left parts of the second lens base 203 shown in Figures 1, 3, and 4. At this time, two types of spacers 209a, 209b and a washer 210 are sandwiched between each optical system and the second lens base 203. By adjusting the thickness of these spacers 209a, 209b and the washer 210 in the direction in which the first and third optical axes OA1, OA3 extend (hereinafter referred to as the optical axis direction), it is possible to adjust the focal positions of the right-eye optical system 201R and the left-eye optical system 201L to be the same position.

[0028] The second lens base 203 is fixed to the lens mount 202 with screws, sandwiching the focus ring 205 and the focus flange 204. The focus ring 205 is a cam-shaped member whose thickness in the optical axis direction of the portion that abuts against the second lens base 203 changes depending on the angle of rotation of the focus ring 205. By rotating the focus ring 205, the distance in the optical axis direction between the focus flange 204 and the second lens base 203 can be changed. This action allows the right eye optical system 201R and the left eye optical system 201L to be moved as a whole in the optical axis direction, thereby simultaneously performing focus adjustment (focusing).

[0029] The cases 206a and 206b are fixed to the second lens base 203 from above and below with screws so as to cover the second lens base 203 and the portions of the right-eye optical system 201R and the left-eye optical system 201L that are closer to the object than the second lens base 203.

[0030] Here, the lens mount 202 is configured to be fitted into the camera mount 122 (see FIG. 8) and rotated to be bayonet-coupled. The lens mount 202 is formed with a bayonet claw 202a for bayonet coupling.

[0031] The fitting diameter when the lens mount 202 is fitted into the camera mount 122 is ΦD as shown in Fig. 1. In Fig. 1, the dashed dotted line 202F is the flange surface of the lens mount 202.

[0032] The first to third lenses 211, 211-2, 211-3 along the first optical axis OA1 and the fourth lens 221 along the second optical axis OA2 are located closer to the object than the flange surface 202F of the lens mantle 202, and are located closer to the object than the camera mount 122 when the stereoscopic imaging lens 200 is attached to the camera body.

[0033] The distance (spacing) between the third optical axis OA3 of the right-eye optical system 201R and the left-eye optical system 201L is L2, and the inner diameter of the focus ring 205 is φF. At this time, φF is larger than L2 because the inner circumference of the focus ring 205 rotatably fits into the outer circumference of the second lens base 203 that holds the right-eye optical system 201R and the left-eye optical system 201L.

[0034] The lenses along the third optical axis OA3 are the fifth and sixth lenses 231R and 231-2R ​​in the right-eye optical system 201R, and the fifth and sixth lenses 231L and 231-2L in the left-eye optical system 201L. A lens mount cover 208 is attached to the end of the stereoscopic imaging lens 200 on the image side.

[0035] The lens mount cover (cover member) 208 has a first cover portion 208a located slightly closer to the object side than the image side lens surfaces (hereinafter referred to as the left and right final lens surfaces) of the sixth lenses 231-2L and 231-2R, which are the most image side lenses and are almost flush with the most image side surface of the bayonet claws 202a of the lens mount 202, and a second cover portion 208b formed in the center of the first cover portion 208a so as to protrude toward the image side from the first cover portion 208a and the left and right final lens surfaces. At positions of the second cover portion 208b facing the left and right final lens surfaces, left and right cylindrical wall portions 208L and 208R are formed with openings formed on the inside through which the light emitted from the final lens surfaces passes.

[0036] The left and right cylindrical wall portions 208L, 208R are formed so as to surround the outer circumferences of the left and right final lens surfaces. The portion (hereinafter referred to as the boundary wall portion) 208e between these cylindrical wall portions 208L, 208R serves as a light-shielding wall that blocks light so that crosstalk does not occur, in which light emitted from each of the left and right final lens surfaces adjacent to each other enters an image circle formed on the image sensor of the camera body by light emitted from the other final lens surface. In other words, the boundary wall portion 208e is a light-shielding wall provided between the optical paths from each of the left and right final lens surfaces. Since it is not possible to provide a light-shielding shape corresponding to the left and right optical systems 201L, 201R of the stereoscopic imaging lens 200, which is an interchangeable lens, in advance on the camera body side, the occurrence of crosstalk can be avoided by providing the boundary wall portion 208e (cylindrical wall portions 208L, 208R) in the stereoscopic imaging lens 200.

[0037] In this embodiment, the boundary wall 208e between the left and right cylindrical wall portions 208L and 208R is used as a light-shielding wall. However, it is also possible to provide only a light-shielding wall equivalent to the boundary wall portion without providing a cylindrical wall portion (i.e., without providing the lens mount cover 208).

[0038] In addition, the image-side end 208c of the cylindrical wall portions 208R and 208L is formed in an edge shape that protrudes inward of the opening. The edge-shaped end 208c cuts unnecessary light reflected by the cylindrical walls 208R and 208L, thereby preventing the occurrence of ghosts. In addition, when the right-eye optical system 201R and the left-eye optical system 201L are full-circle fisheye lenses, unnecessary light in the entire circumference of the full-circle fisheye lenses can be cut. Note that the right-eye optical system 201R and the left-eye optical system 201L may be full-circle fisheye lenses, or may be fisheye lenses that are not full-circle fisheye lenses.

[0039] Fig. 5(a) shows a cross section of the stereoscopic imaging lens 200 cut along the dashed line 213F in Fig. 1 and seen from the object side, and Fig. 5(b) shows an enlarged view of the periphery of the second lens 211-2L in the cross section. Here, the arrangement of the decentered rollers 214a, 214b and the decentered rollers 219a, 219b on the left-eye optical system 201L side will be described. The arrangement of these decentered rollers is the same on the right-eye optical system 201R side.

[0040] Six eccentric rollers 214a, 214b for optical adjustment of the first lens 211 held by the first lens holding member 212 and six eccentric rollers 219a, 219b for optical adjustment of the second lens 211-2L held by the second lens holding member 218L are arranged within a range L7 between the first lens 211 (its image-side surface) and the second optical system (220L, 221L, 230L) in the optical axis direction (the direction in which the first optical axis OA1 extends) shown in Fig. 1. Furthermore, as shown in Fig. 1, in the optical axis direction, the area A where the eccentric rollers 214a, 214b (the eccentric parts of each eccentric roller) are arranged and the area B where the eccentric rollers 219a, 219b are arranged at least partially overlap each other. In other words, the area A and the area B at least partially overlap in a direction perpendicular to the optical axis direction. To enable such an arrangement of eccentric rollers, as shown in Figures 5(a) and (b), eccentric rollers 214a, 214b and eccentric rollers 219a, 219b are arranged alternately around the second lens 211-2L (in the circumferential direction centered on the first optical axis OA1).

[0041] The outer diameter of the first lens 211L is larger than that of the second lens 211-2L. Therefore, the eccentric rollers 214a and 214b are arranged not around the first lens 211L but in the range L7 between the first lens 211L and the second optical system, particularly around the second lens 211-2L, so as to alternate with the eccentric rollers 219a and 219b in the circumferential direction, thereby making it possible to reduce the outer shape of the stereoscopic imaging lens 200 (cases 206a and 206b). As a result, as shown in FIG. 1, a distance L6 between the stereoscopic imaging lens 200 and the grip part 130 protruding from the camera body toward the object side can be ensured to be a distance sufficient for a user to hold the grip part 130.

[0042] The portions of the cases 206a and 206b that cover the side surfaces of the first to third lenses (first optical system) 211R to 211-3R and 211L to 211-3L have a curved shape that is concave toward the first optical system in order to maximize the distance L6 from the grip portion 130.

[0043] If the first adjustment mechanism and the second adjustment mechanism were arranged in different regions in the optical axis direction, the eccentric rollers 214a, 214b, 219a, 219b, the first lens holding member 212L, the second lens holding member 218L, and the first lens base 213 would become larger. In other words, the outer shape of the stereoscopic imaging lens 200 would become larger. As a result, the distance L6 between the stereoscopic imaging lens 200 and the grip section 130 of the camera body would become smaller, making it difficult for the user to hold the grip section 130.

[0044] Fig. 6 shows the lens mount cover 208 as seen from the image side. Fig. 7 shows the positional relationship between the right-eye and left-eye optical systems 201R, 201L (211R, 211L), the first to third optical axes OA1R-OA3R, OA1L-OA3L, the inner circumference of the mount (camera mount 122 and lens mount 202), the imaging element 111 provided in the camera body, and the image circles ICR, ICL of the right-eye and left-eye optical systems 201R, 201L on the imaging element 111. In Fig. 6, the imaging element 111 is indicated by a dashed line.

[0045] In FIG. 6, the length L in the vertical direction (direction perpendicular to the left-right direction and parallel to the image plane) of the boundary wall portion 208e provided between the optical paths from the sixth lenses 231-2R, 231-2L (final lens surfaces) toward the image sensor is set to be longer than the diameter ΦD2 of the image circles ICR, ICL shown in FIG. 7.

[0046] 1, of the stereoscopic imaging lens 200, parts of the fifth lenses 231R and 231L, the sixth lenses 231-2R ​​and 231-2L, and the lens mount cover 208 protrude toward the image side beyond the flange surface 202F of the lens mount 202. As a result, they extend beyond the flange surface of the camera mount 122 and enter inside the camera body. If the distance between the image side end surface of the lens mount cover 208 (boundary wall portion 208e) and the imaging element (imaging surface) 111 (not shown in FIG. 1) is L3, the distance between the flange surface 202F and the imaging element 111 is L4, and the distance between the image side surface of the sixth lenses 231-2R ​​and 231-2L and the imaging element 111 is L5, then L3, L4, and L5 are expressed as follows: L3 <L5 L3 <L4 These have a relationship of

[0047] In the single-lens reflex camera body, a shutter and a mirror are disposed on the object side of the imaging element 111. Therefore, the portion of the stereoscopic imaging lens 200 that protrudes toward the image side from the flange surface 202F (hereinafter referred to as the image-side protruding portion) can enter up to the front of the shutter on the object side of the mirror. On the other hand, in the mirrorless camera body, since there is no mirror and the shutter is disposed near the imaging element 111, the image-side protruding portion of the stereoscopic imaging lens 200 can enter further into the camera body. Furthermore, in the mirrorless camera body without a shutter, the image-side protruding portion of the stereoscopic imaging lens 200 can enter up to a position close to the imaging element 111. The shorter the distance L3 between the boundary wall portion 208e and the imaging element 111, the less likely it is that light from each of the sixth lenses 231-2R ​​and 231-2L will leak into the image circle of the other optical system.

[0048] 7, an image circle ICR of the right-eye optical system 201R and an image circle ICL of the left-eye optical system 201L are formed side by side on the imaging element 111. The diameter ΦD2 of each image circle and the distance between the image circles ICR and ICL should be set so that the image circles ICR and ICL do not overlap. For example, it is preferable to set the center of the image circle ICR of the right-eye optical system 201R to be located in the center of the right imaging region when the imaging surface of the imaging element 111 is divided in half at the center, and the center of the image circle ICL of the left-eye optical system 201L to be located in the center of the left imaging region.

[0049] The right-eye and left-eye optical systems 201R and 201L in this embodiment are each configured as a full-circle fisheye lens, and the subject image formed by these is a circular image formed by light from a range of an angle of view of approximately 180°. Therefore, as shown in Fig. 7, two circular images are formed on the left and right sides of the imaging surface of the imaging element 111. The longer the base length L1, which is the distance (spacing) between the first optical axis OA1R of the right-eye optical system 201R and the first optical axis OA1L of the left-eye optical system 201L shown in Fig. 1, the greater the stereoscopic effect given to the user when viewing the captured image data.

[0050] For example, the size of the imaging surface of the image sensor 111 is 24 mm vertical × 36 mm horizontal, the diameter ΦD2 of the image circles ICR, ICL is 17 mm, the distance L2 between the third optical axes OA3R, OA3L is 18 mm, and the length of the second optical axes OA2R, OA2L is 21 mm. If the right-eye and left-eye optical systems 201R, 201L are arranged so that the second optical axes OA2R, OA2L extend horizontally, the baseline length L1 is 60 mm, which is approximately equal to the interpupillary distance of an adult.

[0051] Also, the inner diameter ΦD of the lens mount 202 may be shorter than the base length L1. Furthermore, by making the interval L2 between the third optical axes OA3R and OA3L shorter than the inner diameter ΦD of the lens mount 202, the fifth lenses 231R and 231L and the sixth lenses 231-2R ​​and 231-2L can be disposed inside the respective mounts. L2<φD <L1 The following setting is preferable.

[0052] The inner diameter φF of the focus ring 205 is, with respect to the distance L2, L2<φF These have a relationship of

[0053] 8 shows a configuration example of a stereoscopic imaging system 100 including a stereoscopic imaging lens 200 and a camera body 110 to which the stereoscopic imaging lens 200 is detachably attached. The stereoscopic imaging lens 200 includes the right eye optical system 201R and the left eye optical system 201L described above, and a lens control unit 209.

[0054] The camera body 110 has the above-mentioned camera mount 122 and image sensor 111, as well as an A / D converter 112, an image processing unit 113, a display unit 114, an operation unit 115, a storage unit 116, and a camera control unit 117. When the lens mount 202 of the stereoscopic imaging lens 200 is attached to the camera mount 122 of the camera body 110, the camera control unit 117 and the lens control unit 209 are electrically connected.

[0055] Subject images (right eye image and left eye image) are formed side by side on the imaging element 111 by the right eye optical system 201R and the left eye optical system 201L, respectively. The imaging element 111 captures the subject image and converts it into an analog electrical signal. The A / D converter 112 converts the analog electrical signal output from the imaging element 111 into a digital signal. The image processing unit 113 performs various image processing on the digital signal output from the A / D converter 112 to generate image data.

[0056] The display unit 114 displays image data and functions as an electronic viewfinder, and also displays various information related to imaging. The display unit 114 is implemented by a display device such as a liquid crystal panel or an organic EL panel.

[0057] The operation unit 115 functions as a user interface for the user to give various instructions to the stereoscopic imaging system 100. In the case where the display unit 114 has a touch sensor, the operation unit 115 also includes the touch sensor.

[0058] The camera control unit 117 is responsible for the overall control of the stereoscopic imaging system 100. The camera control unit 117 is configured with a computer such as a CPU or an MPU. The storage unit 116 stores various data such as image data. The storage unit 116 also stores a program for the camera control unit 117 as a computer to execute processing. The storage unit 116 is configured with a ROM, a RAM, a HDD, and the like.

[0059] In the above embodiment, a stereoscopic imaging lens having right-eye and left-eye optical systems has been described; however, the configuration in which the area in which a plurality of first adjustment members are arranged and the area in which a plurality of second adjustment members are arranged overlap each other in the optical axis direction can also be applied to a lens device having a monocular optical system. EXAMPLES

[0060] Next, a second embodiment of the present invention will be described. Fig. 9 shows the periphery of the lens mount cover (cover member) 258 in this embodiment as viewed from the image side. Fig. 10 shows a cross section of the periphery of the lens mount cover 258. This embodiment is the same as the first embodiment except for the lens mount cover 258, so a description thereof will be omitted.

[0061] The lens mount cover 258 has a first cover portion 258a located slightly closer to the object side than the left and right final lens surfaces, and a second cover portion 258b formed inside the first cover portion 258a so as to protrude toward the image side from the first cover portion 258a and the left and right final lens surfaces. Left and right cylindrical wall portions 258L and 258R are formed at positions facing the left and right final lens surfaces, and have openings formed on the inside through which light emitted from the final lens surfaces passes. The left and right cylindrical wall portions 258L and 258R are formed so as to surround the outer peripheries of the left and right final lens surfaces.

[0062] As shown in Fig. 9, the image side ends of the cylindrical walls 258R and 258L have an arc-shaped portion 258c that extends in an arc shape along a circle that is coaxial with the final lens and surrounds the optical path from the final lens, and a D-cut portion 258f that extends in a straight line so as to connect both ends of the arc-shaped portion 258c on the boundary wall side. This makes each opening D-shaped. The D-cut portion 258f corresponds to a light-shielding portion that protrudes inward from a part of the circle that is coaxial with the final lens and surrounds the optical path from the final lens.

[0063] 10, the arc-shaped portion 258c and the D-cut portion 258f are formed into an edge shape that protrudes inward of the opening. The ends of this edge shape cut out unnecessary light reflected by the cylindrical walls 208R and 208L, thereby preventing the occurrence of ghosts.

[0064] The boundary wall 258e between the cylindrical wall portions 258L and 258R is a light-shielding wall provided between the optical paths from the left and right final lens surfaces, respectively, as in the first embodiment. The D-cut portion 258f also has a light-shielding function of blocking the intrusion of light from the optical paths from the left and right final lens surfaces to the other optical path. The boundary wall 258e and the D-cut portion 258f correspond to light-shielding members.

[0065] When a prism is used to bring the image-side optical axes closer to each other as in the right-eye and left-eye optical systems of this embodiment, in addition to the normal light that is reflected only once, the light that is reflected multiple times within the prism reaches the image plane, making it easy for ghosts to occur. The boundary wall portion 258e and the D-cut portion 258f function as a light-shielding portion to prevent the light emitted from each of the left and right final lens surfaces that are close to each other from entering the image circle formed on the image sensor by the light emitted from the other final lens surface, that is, to prevent crosstalk.

[0066] In addition, when the right eye optical system 251R and the left eye optical system 251L are full-circumference fisheye lenses, it is possible to cut out unnecessary light in the entire circumference of the full-circumference fisheye lenses. Note that the right eye optical system 251R and the left eye optical system 251L may be full-circumference fisheye lenses, or may be fisheye lenses other than full-circumference fisheye lenses.

[0067] In this embodiment as well, the lens mount cover 258 may not be provided, and a light-shielding member having only a light-shielding wall corresponding to the boundary wall portion and a light-shielding portion corresponding to the D-cut portion may be provided.

[0068] FIG. 11 shows an image acquired by an imaging element using right-eye and left-eye optical systems 251R and 251L as full-circle fisheye lenses. The right-eye and left-eye optical systems 251R and 251L form an image of light from a subject on one imaging element so that the light is upside down and upside down. Therefore, an image acquired by the imaging element rotated 180 degrees is an image that is normally used. Therefore, FIG. 11 also shows a right-eye image 300R through the right-eye optical system 251R on the left side, and a left-eye image 300L through the left-eye optical system 251L on the right side.

[0069] However, by arranging two wide-angle optical systems like fisheye lenses, the left end area (first area) 301 of the right eye image 300R reflects the first lens (211L in FIG. 1) of the other optical system, the left eye optical system 251L, which is the closest to the subject, and the press ring (215L) around it, which is a member for holding the lens, and the light from the exterior parts. Similarly, the right end area (first area) 302 of the left eye image 300L reflects the first lens (211R in FIG. 1) of the other optical system, the right eye optical system 251R, which is the closest to the subject, and the press ring (215R) around it, and the light from the exterior parts. For this reason, a complete 360° image cannot be obtained by only one of the right eye and left eye optical systems 251R and 251L.

[0070] The arc-shaped portion 258c at the image-side end of the cylindrical wall portions 258R and 258L forms an image on the imaging element (within the image circle) without blocking the effective light of the full-circle fisheye lens. However, the D-cut portion 258f has a convex shape that protrudes toward the inside of the opening more than the arc-shaped portion 258c, and therefore blocks a part of the effective light, causing vignetting. Therefore, the regions (second regions) 311 and 312 corresponding to the D-cut portion 258f in the image of FIG. 11 are not completely dark, but are darker than other peripheral regions. The regions 311 and 312 are regions located at positions corresponding to the left end region 301 in the right eye image 300R and the right end region 302 in the left eye image 300L, respectively.

[0071] When using an ultra-wide-angle optical system such as a fisheye lens in a stereoscopic imaging system that captures images through left and right optical systems, the lens or exterior part of the other optical system closest to the subject is reflected on the image plane of one optical system. In this case, an image that should be reflected in the area where the lens or exterior part of the other optical system is reflected on the image plane of one optical system is reflected only in the other optical system. As a result, an image that can be viewed stereoscopically cannot be obtained in that area. Therefore, even if vignetting occurs in the area in both optical systems, it is not a problem in practice. Furthermore, in the area where the ghost is blocked, even if there is a decrease in the amount of light due to vignetting, there is no effect on stereoscopic imaging as long as it is not captured simultaneously through the left and right optical systems.

[0072] (Reference material) Japanese Patent Application Publication No. 2009-180976 discloses a technique for providing a light shielding wall extending from an optical system to a position close to an image sensor in order to prevent light from other optical systems from entering the image circle of each of the optical systems. However, this technique is a technique for miniaturizing a compound eye optical system. In an image system with interchangeable lenses as in this embodiment, a focal plane shutter and an optical filter are disposed in front of the image sensor, so that the length of the light shielding wall is limited, and it is not possible to extend the light shielding wall to a position close to the image sensor as in Japanese Patent Application Publication No. 2009-180976. In other words, the technique of Japanese Patent Application Publication No. 2009-180976 cannot be applied to an image system with interchangeable lenses as in this embodiment.

[0073] The embodiments described above are merely representative examples, and various modifications and alterations are possible for each embodiment when implementing the present invention. [Explanation of symbols]

[0074] 200 Stereoscopic Imaging Lens 201R, 251R Right eye optical system 201L, 251L left eye optical system 202 Lens mount 208, 258 Lens mount cover 208e, 258 Boundary wall (shading wall) 211R / L 1st lens 211-2R / L 2nd lens 211-3R / L 3rd lens 220R / L First Prism 221R / L 4th lens 230R / L Second Prism 231R / L 5th lens 231-2R / L 6th lens OA1R / L 1st optical axis OA2R / L 2nd optical axis OA3R / L 3rd optical axis 258c Arc-shaped section 258f D-cut section

Claims

1. A lens device having a right-eye optical system and a left-eye optical system, and a lens mount that is detachably attached to an imaging device, the distance between the optical axes of the image-side portions of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object-side portions of the right-eye and left-eye optical systems; a light-shielding wall that is provided between an optical path from a final lens surface closest to the image side in each of the right-eye and left-eye optical systems toward an image plane, and that blocks light from the final lens surface of the right-eye optical system toward an image circle of the left-eye optical system and blocks light from the final lens surface of the left-eye optical system toward the image circle of the right-eye optical system, a final lens surface disposed on the image side of a flange surface of the lens mount;

2. each of the right-eye optical system and the left-eye optical system includes, in order from an object side to an image side, a first optical system, a second optical system having an optical axis bent with respect to the optical axis of the first optical system, and a third optical system having an optical axis bent with respect to the optical axis of the second optical system; 2 . The lens device according to claim 1 , wherein a distance between the optical axes of the third optical system of each of the right-eye and left-eye optical systems is narrower than a distance between the optical axes of the first optical systems.

3. a cover member is attached to the lens device, the cover member having left and right openings facing the final lens surfaces of the right-eye and left-eye optical systems and protruding toward an image side beyond the final lens surfaces, 3. The lens device according to claim 1, wherein the light blocking wall is provided between the left and right openings in the cover member.

4. the cover member has the opening on an inside thereof, and has cylindrical wall portions on the left and right sides formed so as to surround the final lens surface, 4. The lens device according to claim 3, wherein the light blocking wall is provided between the cylindrical wall portions of the cover member.

5. 5. The lens device according to claim 4, wherein an end portion of the cylindrical wall portion on the image side has a shape that protrudes inwardly of the opening portion.

6. A lens device described in any one of claims 1 to 5, characterized in that the vertical length of the light-shielding wall is longer than the diameter of the image circle.

7. 7. The lens device according to claim 1, wherein a distance between the light blocking wall and an imaging surface of the imaging device is shorter than a distance between the final lens surface and the imaging surface.

8. 7. The lens device according to claim 1, wherein a distance between the light blocking wall and an imaging surface of the imaging device is shorter than a distance between the flange surface and the imaging surface.

9. 9. The lens device according to claim 1, wherein the right-eye and left-eye optical systems are fisheye lenses or full-circle fisheye lenses.

10. A lens device according to any one of claims 1 to 9; and an imaging device to which the lens device is detachably attached.

Images