JP2021177237A - Lens device and imaging system - Google Patents

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

The present invention relates to a lens device that is detachably attached to an imaging device.

In the lens device as an interchangeable lens, as disclosed in Patent Document 1 and Patent Document 2, the optical systems of the left and right optical systems have their optical axes corresponding to the distance between human eyes (for example, 60 to 65 mm) by the base line length. Some of them are arranged in parallel so as to be separated from each other, and a subject image (image circle) is formed by each optical system on one or two image sensors on the left and right. The image data for the left eye and the image data for the right eye recorded by capturing the subject image formed by each of the left and right optical systems are displayed on a stereoscopic display device such as a 3D display or virtual reality (VR) goggles. As a result, the stereoscopic image can be presented to the viewer.

Japanese Unexamined Patent Publication No. 2012-003022 Japanese Unexamined Patent Publication No. 2012-113281

In order to fit the left and right optical systems as described above inside a lens mount with a diameter that can be attached to a general interchangeable lens type image pickup device while ensuring the baseline length between them, each optical system should be installed. It may be bent, the parts of the left and right optical systems on the object side are separated by the baseline length, and the parts on the image side may be brought close to each other.

However, if the image-side portions of the left and right optical systems are brought close to each other, light may enter the image circle of each optical system from the other optical system, and ghosts may occur.

The present invention provides a lens device capable of ensuring a baseline length on the object side and preventing light from the other from entering the image circles of the left and right optical systems that are close to each other on the image side.

The lens device as one aspect of the present invention has a right-eye optical system and a left-eye optical system, and is detachably attached to the image pickup device. The distance between the optical axes of the image-side parts of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object-side parts. It is provided between the optical paths from the final lens surface on the image side to the image surface in each of the right eye and left eye optical systems, and blocks the light from the final lens surface of the right eye optical system to the image circle of the left eye optical system. Moreover, it is characterized by having a light-shielding wall that blocks light from the final lens surface of the left-eye optical system toward the image circle of the right-eye optical system.

Further, the lens device as one aspect of the present invention has a right-eye optical system and a left-eye optical system, and is detachably attached to the image pickup device. In the lens device, the distance between the optical axes of the image-side parts of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object-side parts, and the distance between the optical axes of the right-eye and left-eye optical systems is the highest in each of the right-eye and left-eye optical systems. It has a light-shielding member provided between the optical path from the final lens surface on the image side to the image surface. The light-shielding member is characterized by having a light-shielding portion that protrudes inward from a part of a circle that surrounds the optical path coaxially with the final lens surfaces of the right-eye and left-eye optical systems.

An imaging system including an imaging device to which each of the lens devices is detachably attached also constitutes another aspect of the present invention.

According to the present invention, it is possible to secure a baseline length on the object side to prevent light from the other from entering the image circles of the left and right optical systems that are close to each other on the image side.

FIG. 3 is a plan sectional view of the stereoscopic imaging lens of the first embodiment. The exploded perspective view of the right optical system in the stereoscopic image pickup lens of Example 1. FIG. An exploded perspective view (front perspective view) of the stereoscopic imaging lens of Example 1. An exploded perspective view (rear side perspective view) of the stereoscopic imaging lens of Example 1. A front sectional view and an enlarged view of the stereoscopic imaging lens of the first embodiment. The figure which shows the mount cover of the stereoscopic image pickup lens of Example 1. FIG. The figure which shows the positional relationship of the 3rd optical axis of the 3D image pickup lens of Example 1 and the image circle on an image pickup element. The block diagram which shows the structure of the stereoscopic image pickup lens and the image pickup apparatus of Example 1. FIG. The figure which shows the periphery of the mount cover of the stereoscopic image pickup lens of Example 2. FIG. 3 is a cross-sectional view of the periphery of the mount cover of the stereoscopic imaging lens of the second embodiment. The figure which shows the image acquired using the stereoscopic image pickup lens of Example 2. FIG.

Hereinafter, examples of the present invention will be described with reference to the drawings.

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 image pickup lens 200 is an interchangeable lens that is detachably attached to a camera body as an image pickup device. FIG. 1 shows a grip portion 130 that the user holds with his / her right hand in the camera body.

The stereoscopic imaging lens 200 has a right eye optical system 201R and a left eye optical system 201L. When the stereoscopic image pickup lens 200 is attached to the camera body, the image circles (subject images) of the right eye optical system 201R and the left eye optical system 201L are formed on the right image pickup area on the image sensor provided in the camera body. It is formed simultaneously in the left imaging region. The image sensor captures subject images formed in these right and left imaging regions.

FIG. 2 shows the right eye optical system 201R in an exploded manner. The right-eye optical system 201R and the left-eye optical system 201L have the same configuration as each other except that their optical axes are line-symmetrical with respect to the central axis of the stereoscopic imaging lens 200. 3 and 4, respectively, show the stereoscopic imaging lens 200 viewed from the front side and the rear side in an exploded manner. In the following description, R is added to the end of the code of the component of the right eye optical system 201R, and L is added to the end of the code of the component of the left eye optical system 201L. Further, neither R nor L is added to the end of the code of the component common to both the right eye optical system 201R and the left eye optical system 201L.

The right-eye optical system 201R and the left-eye optical system 201L have a first optical axis OA1 and a second optical axis OA2 that bends at a right angle from the first optical axis OA1 and extends from the object (subject) side to the image side, respectively. It has a third optical axis OA3 that is bent at a right angle from the second optical axis OA2 and extends in parallel with the first optical axis OA1. Each optical system includes a first lens 211, a second lens 211-2 and a third lens 211-3 arranged along the first optical axis OA1, and a fourth lens arranged along the second optical axis OA2. It has 221 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 arranged between the first prism 220 and the second prism 230.

The first to third lenses 211, 211-2, and 211-3 constitute a first optical system having a first optical axis OA1 (a portion of the right eye and left eye optical systems on each object side), and the first lens is a second lens. The 1 prism 220, the 4th lens 221 and the 2nd prism 230 constitute a second optical system having a second optical axis OA2 bent with respect to the first optical axis OA1. Further, the fifth lens 231 and the sixth lens 231-2 have a third optical system having a third optical axis OA3 bent with respect to the second optical axis OA2 (on the image side of each of the right eye and left eye optical systems). Part).

Hereinafter, the configuration of the right eye optical system 201R shown in FIG. 2 will be described. 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.

The first lens 211R is held by the first lens holding member 212R, and is held against the first lens holding member 212R by the holding ring 215 fixed to the first lens holding member 212R. A dustproof member 216 that closes a gap between the cases 206a and 206b as exterior members, which will be described later, is attached to the outer peripheral portion of the holding ring 215.

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

On the first lens base 213R, a first lens holding member 212R arranged on the outer periphery thereof (see FIG. 5B) enables optical adjustment including eccentricity adjustment and tilt adjustment of the first lens 211R. It is attached via two or three types of eccentric rollers 214a and eccentric rollers 214b. The eccentric rollers 214a and 214b correspond to the adjusting members for eccentricity adjustment and tilt adjustment as the first adjusting member, respectively. The eccentricity adjustment of the lens referred to in this embodiment means the correction of the deviation of the optical axis of the lens with respect to the first optical axis OA1 in the direction orthogonal to the first optical axis OA1, and the tilt adjustment means the correction of the deviation of the optical axis of the lens with respect to the light of the lens. It means the correction of the inclination of the axis with respect to the first optical axis OA1.

Further, on the first lens base 213R, a second lens holding member 218R arranged on the inner circumference thereof (see FIG. 5B) is provided with optical adjustment including eccentricity adjustment and tilt adjustment of the second lens 211-2R. It is attached via two types and three eccentric rollers 219a and eccentric rollers 219b so as to be possible. The eccentric rollers 219a and 219b correspond to the adjusting members for eccentricity adjustment and tilt adjustment as the second adjusting member. In this embodiment, three eccentric rollers (214a, 214b, 219a, 219b) of the same type are arranged at three locations (plural locations) at 120-degree equal intervals in the circumferential direction around the first optical axis OA1.

The eccentric rollers 214a, 214b, 219a, and 219b have eccentric portions eccentric with respect to their central axes. When the adjuster rotates (operates) the eccentric rollers 214a and 219a around the central axis of the rollers 214a and 219a using a jig, the lens holding members (212R and 218R) move in the direction orthogonal to the optical axis of the lens. Further, by rotating the eccentric rollers 214b and 219b around the central axis thereof, the lens holding member (212R, 218R) moves so that the inclination of the optical axis of the lens is adjusted. With such an optical adjustment mechanism, optical adjustment (eccentricity adjustment and tilt adjustment) of the first and second lenses 211R and 211-2R is possible.

The first prism 220R is assembled and adhered 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 by a screw (not shown).

The fourth lens 221R is assembled and adhered to the fourth lens holding member 222R from the direction of the second optical axis OA2, and the second prism 230R is assembled and adhered 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 are held by sandwiching the aperture unit 223R between them. The prism base 217R is fixed to the fourth lens holding member 222R with screws.

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

The right eye optical system 201R and the left eye optical system 201L configured as described above are fixed to the right and left portions of the second lens base 203 shown in FIGS. 1, 3 and 4, respectively, with screws. At this time, two types of spacers 209a and 209b and a washer 210 are sandwiched between each optical system and the second lens base 203. By adjusting the thicknesses of the spacers 209a and 209b and the washer 210 in the direction in which the first and third optical axes OA1 and OA3 extend (hereinafter referred to as the optical axis direction), the right eye optical system 201R and the left eye optical system 201L The focus positions can be adjusted so that they are in the same position as each other.

The second lens base 203 is fixed to the lens mount 202 with screws so as to sandwich 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 a portion that comes into contact with the second lens base 203 changes depending on the angle at which it rotates. By rotating the focus ring 205, the distance between the focus flange 204 and the second lens base 203 in the optical axis direction can be changed. By this action, the entire right eye optical system 201R and the left eye optical system 201L can be moved in the optical axis direction to simultaneously perform focus adjustment (focusing).

The cases 206a and 206b are attached to the second lens base 203 by screws from above and below so as to cover the portion of the second lens base 203, the right eye optical system 201R, and the left eye optical system 201L on the object side of the second lens base 203. It is fixed.

Here, the lens mount 202 is configured to fit and rotate with respect to the camera mount 122 (see FIG. 8) to be bayonet-coupled. The lens cloak 202 is formed with a bayonet claw 202a for connecting the bayonet.

The fitting diameter when the lens mount 202 is fitted to the camera mount 122 is ΦD as shown in FIG. In FIG. 1, the alternate long and short dash line 202F is the flange surface of the lens mount 202.

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 closer to the object side than the flange surface 202F of the lens cloak 202. When the stereoscopic imaging lens 200 is attached to the camera body, it is located closer to the object than the camera mount 122.

The distance (interval) 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 is rotatably fitted to the outer circumference of the second lens base 203 holding the right eye optical system 201R and the left eye optical system 201L.

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 image-side end of the stereoscopic imaging lens 200.

The lens mount cover (cover member) 208 is an image of the sixth lens 231-2L, 231-2R, which is substantially the same surface as the image-side surface of the bayonet claw 202a of the lens cloak 202 and is the most image-side lens. The first cover portion 208a located slightly closer to the object side than the side lens surfaces (hereinafter referred to as the left and right final lens surfaces), the first cover portion 208a at the center of the first cover portion 208a, and the left and right finals. It has a second cover portion 208b formed so as to project toward the image side from the lens surface. Left and right cylindrical wall portions 208L and 208R having openings formed inside through which light emitted from the final lens surface passes are formed at positions of the second cover portion 208b facing the left and right final lens surfaces. There is.

The left and right cylindrical wall portions 208L and 208R are formed so as to surround the outer periphery of the left and right final lens surfaces. The portion between the cylindrical wall portions 208L and 208R (hereinafter referred to as the boundary wall portion) 208e is formed by the light emitted from each of the left and right final lens surfaces adjacent to each other and the light emitted from the other final lens surface. It has a role as a light-shielding wall that blocks light so as not to cause crosstalk that enters the image circle formed on the image sensor. That is, 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 in advance a light-shielding shape corresponding to the left and right optical systems 201L and 201R of the three-dimensional image pickup lens 200 which is an interchangeable lens on the camera body side, the boundary wall portion 208e (cylindrical wall portion 208L, By providing 208R), it is possible to avoid the occurrence of crosstalk.

In this embodiment, the case where the boundary wall portion 208e between the left and right cylindrical wall portions 208L and 208R is used as a light-shielding wall has been described, but the cylindrical wall portion is not provided (that is, the lens mount cover 208 is not provided). Only a light-shielding wall corresponding to the boundary wall portion may be provided.

Further, the end portions 208c on the image side of the cylindrical wall portions 208R and 208L are formed in an edge shape protruding inward of the opening. The edge-shaped end 208c can prevent the occurrence of ghosts by cutting unnecessary light reflected by the cylindrical walls 208R and 208L. Further, when the right eye optical system 201R and the left eye optical system 201L are all-around fisheye lenses, unnecessary light in the entire circumference of the all-around fisheye lens can be cut. The right eye optical system 201R and the left eye optical system 201L may be an all-around fisheye lens, or may be a fisheye lens that is not an all-around fisheye lens.

FIG. 5A shows a cross section of the stereoscopic imaging lens 200 cut along the alternate long and short dash line 213F in FIG. 1 and viewed from the object side, and FIG. 5B shows an enlarged periphery of the second lens 211-2L in the cross section. Is shown. Here, the arrangement of the eccentric rollers 214a and 214b and the eccentric rollers 219a and 219b on the left eye optical system 201L side will be described. The arrangement of these eccentric rollers is the same on the right eye optical system 201R side.

Six eccentric rollers 214a and 214b for optical adjustment of the first lens 211 held by the first lens holding member 212 and six eccentric rollers for optical adjustment of the second lens 211-2L held by the second lens holding member 218L. 219a and 219b are between the first lens 211 (the surface on the image side) and the second optical system (220L, 221L, 230L) in the optical axis direction (direction in which the first optical axis OA1 extends) shown in FIG. It is arranged within the range L7. Further, as shown in FIG. 1, in the optical axis direction, the region A in which the eccentric rollers 214a and 214b (eccentric portions in each eccentric roller) are arranged and the region B in which the eccentric rollers 219a and 219b are arranged are at least those regions. Some overlap with each other. In other words, the region A and the region B overlap at least a part in the direction orthogonal to the optical axis direction. In order to enable such arrangement of the eccentric rollers, as shown in FIGS. 5A and 5B, the eccentric rollers 214a and 214b and the eccentric rollers 219a and 219b are around the second lens 211-2L. They are arranged alternately in the circumferential direction centered on the first optical axis OA1).

This is because the outer diameter of the first lens 211L is larger than the outer diameter of the second lens 211-2L. Therefore, the eccentric rollers 214a and 214b are placed not around the first lens 211L but within the range L7 between the first lens 211L and the second optical system, particularly around the second lens 211-2L. By arranging the stereoscopic imaging lenses 200 (cases 206a and 206b) so as to alternate with the 219b in the circumferential direction, the outer shape of the stereoscopic imaging lenses 200 (cases 206a and 206b) can be miniaturized. As a result, as shown in FIG. 1, the distance L6 between the stereoscopic imaging lens 200 and the grip portion 130 protruding from the camera body toward the object side is such that a sufficient distance is secured for the user to grip the grip portion 130. Can be done.

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 are intended to increase the distance L6 from the grip portion 130 as much as possible. In addition, it has a curved surface shape that is recessed on the first optical system side.

If the first adjustment mechanism and the second adjustment mechanism are 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 second lens holding member 218L. One lens base 213 turns larger. That is, the outer shape of the stereoscopic imaging lens 200 becomes large. Therefore, the distance L6 between the stereoscopic image pickup lens 200 and the grip portion 130 of the camera body becomes small, and the user cannot grip the grip portion 130.

FIG. 6 shows the lens mount cover 208 as seen from the image side. Further, FIG. 7 shows the right eye and left eye optical systems 201R, 201L (211R, 211L), the first to third optical axes OA1R to OA3R, OA1L to OA3L, and the mounts (camera mount 122 and lens mount 202). The positional relationship between the circumference, the image pickup element 111 provided on the camera body, and the image circles ICR and ICL of the right eye and left eye optical systems 201R and 201L on the image pickup element 111 is shown. In FIG. 6, the image sensor 111 is shown by a alternate long and short dash line.

In FIG. 6, the direction parallel to the image plane perpendicular to the left-right direction of the boundary wall portion 208e provided between the optical paths from the sixth lens 231-2R and 231-2L (final lens plane) to the image pickup element. ) Is set to be longer than the diameter ΦD2 of the image circle ICR and ICL shown in FIG.

As shown in FIG. 1, a part of the fifth lens 231R and 231L, the sixth lens 231-2R and 231-2L, and the lens mount cover 208 of the stereoscopic imaging lens 200 have an image more than the flange surface 202F of the lens mount 202. It protrudes to the side. Therefore, it goes beyond the flange surface of the camera mount 122 and enters the inside of the camera body. The distance between the image-side end surface of the lens mount cover 208 (boundary wall portion 208e) and the image sensor (image sensor) 111 (not shown in FIG. 1) is L3, and the distance between the flange surface 202F and the image sensor 111 is L4. Assuming that the distance between the image side surface of the sixth lens 231-2R and 231-2L and the image sensor 111 is L5, L3, L4 and L5 are
L3 <L5
L3 <L4
Have a relationship.

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

As shown in FIG. 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 image sensor 111. It is preferable to set the distance between the diameter ΦD2 of each image circle and the image circle ICR and ICL so that the image circle ICRs and ICLs do not overlap with each other. For example, when the image pickup surface of the image sensor 111 is divided in half at the center, the center of the image circle ICR of the right eye optical system 201R is located in the center of the right image pickup area, and the left eye optical system is in the center of the left image pickup area. It is preferable to set so that the center of the image circle ICL of 201 L is located.

The right eye and left eye optical systems 201R and 201L of this embodiment are respectively configured as full-circle fisheye lenses, and the subject image formed by these is a circular image in which light from a range of an angle of view of approximately 180 ° is formed. become. Therefore, as shown in FIG. 7, two circular images are formed on the left and right sides of the image pickup surface of the image pickup device 111. The longer the baseline length L1, which is the distance (interval) 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 more the captured image data is viewed. The three-dimensional effect given to the user is increased.

For example, the size of the image pickup surface of the image sensor 111 is 24 mm in length × 36 mm in width, the diameter of the image circle ICR and ICL is 17 mm, the distance L2 between the third optical axis OA3R and OA3L is 18 mm, and the second optical axes OA2R and OA2L. The length is 21 mm. When the right eye and left eye optical systems 201R and 201L are arranged so that the second optical axes OA2R and OA2L extend in the horizontal direction, the baseline length L1 becomes 60 mm, which is almost equal to the eye width of an adult.

Further, the inner diameter ΦD of the lens mount 202 may be shorter than the baseline length L1. Further, by making the distance L2 between the third optical axes OA3R and OA3L shorter than the inner diameter ΦD of the lens mount 202, the fifth lens 231R and 231L and the sixth lens 231-2R and 231-2L are placed inside each mount. Can be placed. That is,
L2 <φD <L1
Is preferable.

The inner diameter φF of the focus ring 205 is set with respect to the interval L2.
L2 <φF
Have a relationship.

FIG. 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 above-mentioned right eye optical system 201R and left eye optical system 201L, and a lens control unit 209.

The camera body 110 includes the above-mentioned camera mount 122 and image sensor 111, 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.

Subject images (right-eye image and left-eye image) are formed side by side on the image sensor 111 by the right-eye optical system 201R and the left-eye optical system 201L, respectively. The image sensor 111 captures a subject image and converts it into an analog electric signal. The A / D converter 112 converts the analog electric signal output from the image sensor 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.

The display unit 114 displays image data and functions as an electronic viewfinder, and also displays various information related to imaging. A display device such as a liquid crystal panel or an organic EL panel is used for the display unit 114.

The operation unit 115 functions as a user interface for the user to give various instructions to the stereoscopic imaging system 100. When the display unit 114 has a touch sensor, the touch sensor is also included in the operation unit 115.

The camera control unit 117 controls the entire stereoscopic imaging system 100. The camera control unit 117 is composed of a computer such as a CPU and 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 by using a ROM, a RAM, an HDD, or the like.

In the above embodiment, the stereoscopic imaging lens having the right-eye and left-eye optical systems has been described, but the region in which the plurality of first adjusting members are arranged and the region in which the plurality of second adjusting members are arranged are defined in the optical axis direction. The configuration in which they overlap each other can also be applied to a lens device having a monocular optical system.

Next, Example 2 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 around the lens mount cover 258. Since this embodiment is the same as that of the first embodiment other than the lens mount cover 258, the description thereof will be omitted.

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 inside the first cover portion 258a from the first cover portion 258a and the left and right final lens surfaces. Also has a second cover portion 258b formed so as to project toward the image side. Left and right cylindrical wall portions 258L and 258R are formed in the second cover portion 258b at positions facing the left and right final lens surfaces so that openings through which light emitted from the final lens surface passes are formed inside. There is. The left and right cylindrical wall portions 258L and 258R are formed so as to surround the outer periphery of the left and right final lens surfaces.

As shown in FIG. 9, the ends of the cylindrical wall portions 258R and 258L on the image side are 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 the arc shape. It has a D-cut portion 258f extending in a linear shape so as to connect both ends of the portion 258c on the boundary wall side. As a result, each opening has a D shape. The D-cut portion 258f corresponds to a light-shielding portion that protrudes inward from a part of a circle that is coaxial with the above-mentioned final lens and surrounds the optical path from the final lens.

Further, in the cross section shown in FIG. 10, the arc-shaped portion 258c and the D-cut portion 258f are formed in an edge shape protruding inward of the opening. The edge-shaped end can prevent the occurrence of ghosts by cutting unnecessary light reflected by the cylindrical walls 208R and 208L.

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

When a prism is used to bring the optical axes on the image side closer to each other as in the right-eye and left-eye optical systems of this embodiment, the light reflected multiple times in the prism is in addition to the normal light reflected only once. Reaches the image plane and ghosts are likely to occur. In the boundary wall portion 258e and the D-cut portion 258f, the light emitted from each of the left and right final lens surfaces adjacent to each other enters the image circle formed on the image sensor by the light emitted from the other final lens surface. That is, it functions as a light-shielding unit for preventing crosstalk.

Further, when the right eye optical system 251R and the left eye optical system 251L are all-around fisheye lenses, unnecessary light in the entire circumference of the all-around fisheye lens can be cut. The right eye optical system 251R and the left eye optical system 251L may be an all-around fisheye lens or a fisheye lens that is not an all-around fisheye lens.

In this embodiment as well, 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 without providing the lens mount cover 258.

FIG. 11 shows an image acquired by an image sensor using the right eye and left eye optical systems 251R and 251L as an all-around fisheye lens. The right-eye and left-eye optical systems 251R and 251L form an image of light from a subject on one image sensor so that the light from the subject is turned upside down. Therefore, an image obtained by rotating the image acquired by the image sensor by 180 ° is a normally used image. Therefore, also in FIG. 11, the right eye image 300R passed through the right eye optical system 251R is shown on the left side, and the left eye image 300L passed through the left eye optical system 251L is shown on the right side.

However, by arranging two optical systems with a wide angle of view like a fisheye lens, the leftmost region (first region) 301 of the right eye image 300R has the most of the other optical system, the left eye optical system 251L. Light from the first lens (211L in FIG. 1) on the subject side, the holding ring (215L in FIG. 1), which is a member for holding the lens around the lens, and the exterior portion are reflected. Similarly, in the right end portion (first region) 302 of the left eye image 300L, the first lens (211R in FIG. 1) on the most subject side of the right eye optical system 251R, which is the other optical system, and the presser around it. Light from the ring (215R) and the exterior part is reflected. Therefore, a complete 360 ° image cannot be obtained with only one of the right eye and left eye optical systems 251R and 251L.

The arc-shaped portion 258c at the end of the cylindrical wall portions 258R and 258L on the image side forms an image on the image sensor (in the image circle) without blocking the effective light rays of the all-around fisheye lens. However, since the D-cut portion 258f has a convex shape that protrudes toward the inside of the opening from the arc-shaped portion 258c, a part of the effective light beam is blocked to cause eclipse. Therefore, in the image of FIG. 11, the region (second region) 311 and 312 corresponding to the D-cut portion 258f is not completely dark, but is darker than the other peripheral portions. 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.

When an ultra-wide-angle optical system such as a fisheye lens is used in a stereoscopic imaging system that captures images through the left and right optical systems, the image plane of one optical system shows the lens and exterior part of the other optical system on the most subject side. It gets crowded. At this time, the image that should originally appear in the area where the lens or exterior portion of the other optical system is reflected on the image plane of one optical system is captured only by the other optical system. As a result, a stereoscopic image cannot be obtained in that region. Therefore, even if eclipse occurs in the region in both optical systems, there is no problem in practical use. Further, in the region where the ghost is shielded, even if there is a decrease in the amount of light due to eclipse, if the images are not simultaneously imaged through the left and right optical systems, there is no effect on stereoscopic imaging.

(Reference material)
Japanese Patent Application Laid-Open No. 2009-180977 describes a light-shielding wall extending from the optical system to a position close to the image sensor in order to prevent light from another optical system from entering the image circles of each of the plurality of optical systems. The technology for providing the above is disclosed. However, this technique is a technique for miniaturizing the compound eye optical system. In the interchangeable lens type image pickup system as in this embodiment, since the focal plane shutter and the optical filter are arranged in front of the image pickup element, there is a limit to the length of the light-shielding wall. It is not possible to extend the light-shielding wall to a position close to the image sensor as in the publication. That is, the technique of JP-A-2009-180976 cannot be applied to an interchangeable lens type imaging system as in this embodiment.

Each of the above-described examples is only a representative example, and various modifications and changes can be made to each of the examples in carrying out the present invention.

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 (light-shielding wall)
211R / L 1st lens 211-2R / L 2nd lens 211-3R / L 3rd lens 220R / L 1st prism 221R / L 4th lens 230R / L 2nd 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 part 258f D cut part

Claims (14)

A lens device that has a right-eye optical system and a left-eye optical system and is detachably attached to an imaging device.
The distance between the optical axes of the image-side parts of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object-side parts.
It is provided between the optical paths from the final lens surface on the image side to the image surface in each of the right eye and left eye optical systems, and from the final lens surface of the right eye optical system to the image circle of the left eye optical system. A lens device having a light-shielding wall that blocks light toward the image circle of the right-eye optical system from the final lens surface of the left-eye optical system. The right-eye optical system and the left-eye optical system have a first optical system and a second optical system having an optical axis bent with respect to the optical axis of the first optical system, respectively, in this order from the object side to the image side. A third optical system having an optical axis bent with respect to the optical axis of the second optical system.
The lens apparatus according to claim 1, wherein the distance between the optical axes of the third optical system of the right eye and the left eye optical system is narrower than the distance between the optical axes of the first optical system. The lens device has a lens mount that is detachably attached to the image pickup device.
The lens device according to claim 1 or 2, wherein the final lens surface is arranged on the image side of the flange surface of the lens mount. A cover member having left and right openings facing the final lens surfaces of the right eye and left eye optical systems and projecting toward the image side from the final lens surface is attached to the lens device.
The lens device according to any one of claims 1 to 3, wherein the light-shielding wall is provided between the left and right openings in the cover member. The lens device according to any one of claims 1 to 4, wherein the vertical length of the light-shielding wall is longer than the diameter of the image circle. The cover member has the opening on the inside, and has cylindrical wall portions formed so as to surround the final lens surface on the left and right.
The lens device according to claim 4 or 5, wherein the light-shielding wall is provided between the cylindrical wall portions of the cover member. The lens device according to claim 6, wherein the image-side end of the cylindrical wall portion has a shape protruding inward of the opening. The invention according to any one of claims 1 to 7, wherein the distance between the light-shielding wall and the imaging surface of the imaging device is shorter than the distance between the final lens surface and the imaging surface. Lens device. The lens device according to claim 3, wherein the distance between the light-shielding wall and the imaging surface of the imaging device is shorter than the distance between the flange surface and the imaging surface. A lens device that has a right-eye optical system and a left-eye optical system and is detachably attached to an imaging device.
The distance between the optical axes of the image-side parts of the right-eye and left-eye optical systems is narrower than the distance between the optical axes of the object-side parts.
Each of the right eye and left eye optical systems has a light-shielding member provided between the optical paths from the final lens surface on the image side to the image surface.
The lens device is characterized by having a light-shielding portion that protrudes inward from a part of a circle that surrounds the optical path coaxially with the final lens surface of each of the right-eye and left-eye optical systems. .. A cover member having left and right openings facing the final lens surfaces of the right eye and left eye optical systems and projecting toward the image side from the final lens surface is attached to the lens device.
The left and right openings each have an arc-shaped portion extending along the circle and the light-shielding portion.
The lens device according to claim 10, wherein the light-shielding portion has a shape that connects both ends of the arc-shaped portion in a linear shape between the left and right openings. The right-eye and left-eye optical systems image light from the most object-side lens of the other optical system and a member holding the lens in a first region in each image circle.
The light-shielding portion is a light directed to a second region in the image circle of each of the right-eye and left-eye optical systems, which is located at a position corresponding to the first region in the image circle of the other optical system. 10. The lens apparatus according to claim 10 or 11, wherein the lens device blocks the lens. The lens apparatus according to any one of claims 1 to 12, wherein the right-eye and left-eye optical systems are a fisheye lens or an all-around fisheye lens. The lens device according to any one of claims 1 to 13.
An imaging system comprising an imaging device to which the lens device is detachably attached.

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