JP2022189278A - lens device - Google Patents

Abstract

To provide a lens device that can achieve both dust-proof and drip-proof performance and optical performance while maintaining the appearance quality, and can perform stereoscopic photography with an angle of view exceeding 180 degrees.SOLUTION: A lens device has: a lens that is arranged on the most subject side; a holding member that holds the lens; a cover member that includes a first opening for exposing the lens when seen from an optical axis direction of the lens, and is positioned with respect to the holding member in the optical axis direction; and an exterior member that includes a second opening fitted to an outer diameter of the cover member. A first gap in a radial direction orthogonal to the optical axis direction formed between the holding member and the cover member is larger than a second gap in the radial direction formed between the exterior member and the cover member.SELECTED DRAWING: Figure 2

Description

The present invention relates to a lens device.

2. Description of the Related Art Conventionally, an interchangeable lens for stereoscopic photography is known as one of interchangeable lens systems. Patent Literature 1 discloses a lens in which two optical systems are arranged in parallel and two image circles are imaged in parallel on one imaging element.

Japanese Unexamined Patent Application Publication No. 2012-3022

When viewing with VR goggles, it is desirable that the angle of view of moving images or still images is 180 degrees or more in order to obtain not only a stereoscopic effect but also a sense of reality. Considering manufacturing errors and the like, it is desirable that the lens be capable of photographing at an angle of view exceeding 180 degrees in order to provide an image of at least 180 degrees.

However, the lens of Patent Literature 1 cannot shoot with an angle of view exceeding 180 degrees. In order to shoot at an angle of view exceeding 180 degrees, the exterior member is arranged closer to the imaging surface than the apex of the front lens so that the exterior member does not block the light flux of 180 degrees or more incident on the front lens, The exterior member must be provided with openings into which the two lenses respectively enter. In this case, if the lens is misaligned, the gap between the opening and the lens becomes uneven, resulting in a problem of appearance quality. Moreover, when a drip-proof structure is provided, non-uniformity of the gap adversely affects the dust-proof and drip-proof performance. If the aperture and the lens are aligned so that the gap is not uneven, the misalignment of the lens is corrected, which adversely affects the optical performance and the relative relationship between the two optical systems.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lens device capable of achieving both dustproof/splashproof performance and optical performance while maintaining appearance quality, and capable of stereoscopic photography at an angle of view exceeding 180 degrees.

A lens device as one aspect of the present invention includes a lens disposed closest to a subject, a holding member that holds the lens, and a first opening that exposes the lens when viewed from the direction of the optical axis of the lens. and a cover member positioned in the optical axis direction, and an exterior member having a second opening that fits with the outer diameter of the cover member, and the optical axis direction formed between the holding member and the cover member The first orthogonal radial gap is characterized in that it is larger than the second radial gap formed between the exterior member and the cover member.

According to the present invention, it is possible to provide a lens device that can achieve both dustproof and dripproof performance and optical performance while maintaining appearance quality, and that is capable of stereoscopic photography at an angle of view exceeding 180 degrees.

1 is a schematic configuration diagram of a camera system according to an embodiment of the present invention; FIG. 1 is a cross-sectional view of a lens device; FIG. 2 is an exploded perspective view of the lens device viewed from the object side; FIG. 2 is an exploded perspective view of the lens device viewed from the imaging surface side; FIG. It is a front view of a lens device. FIG. 6 is a cross-sectional view taken along line AA of FIG. 5; It is a figure which shows the modification of a lens apparatus. FIG. 6 is a cross-sectional view taken along line BB of FIG. 5; It is a figure which shows the positional relationship of each optical axis and the image circle on an image pick-up element. FIG. 10 is a diagram showing reflection of the left-eye optical system when an image is captured by the right-eye optical system; 4 is an external perspective view of a lens cap attached to the lens device; FIG. FIG. 4 is an external perspective view of the lens cap attached to the lens device; FIG. 4 is an external perspective view of the lens cap when attached to and detached from the lens device; 4 is an exploded perspective view of the lens cap; FIG. FIG. 4 is a cross-sectional view of the lens cap and the first group lens when the lens cap is attached; FIG. 4 is a side view of the slider and the first group lens when the lens cap is attached; FIG. 4 is a top view of the slider and the first group lens when the lens cap is attached; It is a cross-sectional view of the lens cap and the first group lens when the lens cap of the modification is attached. 1 is an external perspective view of a lens device; FIG. It is an external appearance side view of a lens apparatus. FIG. 3 is an external bottom view of the lens device;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same reference numerals are given to the same members, and overlapping descriptions are omitted.

FIG. 1 is a schematic configuration diagram of a camera system 100 according to an embodiment of the invention. The camera system 100 has a camera body (imaging device) 110 and a lens device (interchangeable lens) 200, and is capable of capturing stereoscopic images.

The camera body 110 has an image sensor 111 , an A/D conversion section 112 , an image processing section 113 , a display section 114 , an operation section 115 , a storage section 116 , a camera control section 117 and a camera mount 122 .

The lens device 200 includes a right eye optical system (first optical system) 201R, a left eye optical system (second optical system) 201L, a lens mount (mount section) 202, and a lens control section 209. Attached detachably. The two optical systems are arranged in parallel (symmetrically) and configured to image two image circles in parallel on the imaging device 111 . The two optical systems are horizontally aligned with a predetermined distance (baseline length) between them. When viewed from the imaging surface side (image side), an image formed by the right-eye optical system 201R is recorded as a moving image or still image for the right eye, and an image formed by the left-eye optical system 201L is recorded as a left-eye image. Record as video or still images for the eye. When a moving image or still image is played back, a 3D display, VR goggles, or the like is used to view the image, so that the viewer's right eye sees the image for the right eye and the left eye sees the image for the left eye. At this time, an image with parallax is projected to the right eye and the left eye depending on the base line length, so the viewer can obtain a three-dimensional effect. As described above, the lens device 200 is a lens device for stereoscopic photography that can form two images with parallax using two optical systems.

When the lens device 200 is attached to the camera body 110 via the lens mount 202 and the camera mount 122, the camera control section 117 and the lens control section 209 are electrically connected.

The image of the subject is formed on the imaging device 111 by arranging a right-eye image formed via the right-eye optical system 201R and a left-eye image formed via the left-eye optical system 201L. The imaging device 111 converts the formed subject image (optical signal) into an analog electrical signal. The A/D converter 112 converts the analog electrical signal output from the imaging device 111 into a digital electrical signal (image signal). The image processing unit 113 performs various image processing on the digital electrical signal output from the A/D conversion unit 112 .

The display unit 114 displays various information. The display unit 114 is realized by using an electronic viewfinder or a liquid crystal panel, for example. The operation unit 115 functions as a user interface for the user to give instructions to the camera system 100 . Note that when the display unit 114 has a touch panel, the touch panel is also one of the operation units 115 .

The storage unit 116 is realized by using, for example, a ROM, a RAM, and an HDD, and stores various data such as image data subjected to image processing by the image processing unit 113 and programs.

The camera control unit 117 is realized by using a CPU, for example, and controls the camera system 100 as a whole.

FIG. 2 is a cross-sectional view of the lens device 200. As shown in FIG. FIG. 3 is an exploded perspective view of the lens device 200 viewed from the subject side (object side). FIG. 4 is an exploded perspective view of the lens device 200 viewed from the imaging surface side.

In the following description, descriptions of the right-eye optical system 201R are denoted by R, and descriptions of the left-eye optical system 201L are denoted by L. Descriptions common to both the right-eye optical system 201R and the left-eye optical system 201L do not have R or L at the end of the reference numeral. Each optical system of the right-eye optical system 201R and the left-eye optical system 201L is capable of photographing with an angle of view exceeding 180 degrees. Each optical system is a bending optical system having two reflecting surfaces. In each optical system, a first optical axis OA1, a second optical axis OA2 substantially orthogonal to the first optical axis OA1, and a third optical axis OA3 parallel to the first optical axis OA1 are set in order from the object side. Each optical system includes a first lens group 211 having a convex object-side lens surface 211A arranged on a first optical axis OA1, a second lens group 221 arranged on a second optical axis OA2, and a third optical axis. It has three groups of lenses 231a and 231b arranged on the OA3. Each optical system includes a first prism 220 that bends the light beam along the first optical axis OA1 and guides it to the second optical axis OA2, and a second prism 220 that bends the light beam along the second optical axis OA2 and guides it to the third optical axis OA3. 230. In the following description, the optical axis direction indicates the direction parallel to the first optical axis OA1, which is the direction extending to the object side and the imaging surface side.

Each optical system is fixed to the lens top base 300 by screws or the like. The lens top base 300 is fixed to the lens bottom base 301 by screws or the like. The lens bottom base 301 is held so as to be movable in the optical axis direction while its movement in the rotational direction is restricted by a rectilinear structure (not shown). As a result, each optical system can be moved together in the optical axis direction, so that the focus positions of the right-eye optical system 201R and the left-eye optical system 201L can be adjusted at the same time.

FIG. 5 is a front view of the lens device 200. FIG. FIG. 6 is a cross-sectional view taken along the line AA of FIG. 5, showing the first group lens 211 and its peripheral structure. FIG. 7 is a diagram showing a modification of the lens device 200. As shown in FIG. FIG. 8 is a cross-sectional view taken along the line BB of FIG. 5, showing the first group lens 211 of the lens device 200 and its peripheral structure.

The lens device 200 has an exterior cover member 203 and a front exterior member (exterior member) 204 . The exterior cover member 203 houses the right eye optical system 201R and the left eye optical system 201L. The front exterior member 204 is fixed to the exterior cover member 203 with screws, and together with the exterior cover member 203, the front side of the lens device 200 can be accommodated so as to cover it.

The front exterior member 204 has an opening (second opening) 204F into which a first group lens (first lens) 211R of the right eye optical system 201R and a first group lens (second lens) 211L of the left eye optical system 201L enter. have The front exterior member 204 has a shape that does not block the effective light beams of the right-eye optical system 201R and the left-eye optical system 201L with an effective angle of view FOV exceeding 180 degrees. A lens surface 211A on the object side of the first group lenses 211R and 211L is an incident surface of an effective light beam on the object side. When the inner side of the effective entrance surface outer diameter 211C of the lens surface 211A is defined as an effective entrance surface 211B, the luminous flux with an angle of view of 180 degrees extends horizontally in a direction substantially orthogonal to the effective entrance surface 211B and the optical axis. A luminous flux with an angle of view exceeding 180 degrees is closer to the imaging surface than the effective incident surface 211B, and extends toward the imaging surface as the distance from the first group lens 211 increases. Therefore, the front exterior member 204 and the cover member 213 are arranged closer to the imaging surface than the effective incident surface 211B so as not to block the light flux with the angle of view exceeding 180 degrees.

Here, as shown in FIG. 5, from the center point O between the right eye optical system 201R and the left eye optical system 201L, the right eye area 20R is on the right eye optical system 201R side, and the left eye area 20R is on the left eye optical system 201L side. It is assumed that the area is 20L. In the right eye region 20R, the front exterior member 204 captures images as it moves away from the first group lens 211L of the left eye optical system 201L so as not to block the outermost effective luminous flux (thick dotted line in FIG. 8) of the left eye optical system 201L. It has an object side surface 204A that approaches the plane side. In addition, in the left eye area 20L, the front exterior member 204 moves closer to the imaging plane side as it moves away from the first group lens 211R of the right eye optical system 201R so as not to block the outermost effective luminous flux of the right eye optical system 201R. 204B. However, the first lens group 211L and its surroundings seen from the right eye optical system 201R and the first group lens 211R and its surroundings seen from the left eye optical system 201L also have areas that block part of the mutual effective light beams.

The front exterior member 204 has wall portions 204C and 204D that protrude toward the subject from the subject side surfaces 204A and 204B in order to form an opening 204F. The wall portion 204C has an arc shape substantially coaxial with the first group lens 211R of the right-eye optical system 201R, and does not block the effective light flux of the right-eye optical system 201R, but partially blocks the effective light flux of the left-eye optical system 201L. block. The wall portion 204D has an arc shape substantially coaxial with the first lens group 211L of the left-eye optical system 201L, and does not block the effective light flux of the left-eye optical system 201L, but part of the effective light flux of the right-eye optical system 201R. cover the part.

As shown in FIG. 6 , the lens device 200 has a first group lens holding member 212 and a cover member 213 . The first group lens holding member 212 holds the first group lenses 211R and 211L. The cover member 213 covers the outer peripheral portions of the subject-side lens surfaces 211A of the first group lenses 211R and 211L, and has openings (first openings) 213A into which the first group lenses 211R and 211L enter. The opening 213A is formed so as to expose the first group lenses 211R and 211L when viewed from the optical axis direction.

A boundary 211D with the lens surface 211A exists on the outer peripheral side of the effective incident surface outer diameter 211C of the first group lens 211 . A boundary 211D is a boundary between the lens surface 211A and other surfaces or members. For example, the boundary 211D may be the boundary between the lens surface 211A and the side surface 211E of the first group lens 211, or as shown in FIG. It may be a boundary with the inner diameter tip portion of the crimped claw shape.

A cover member 213 covers the boundary 211D. That is, the inner diameter of opening 213A of cover member 213 is smaller than the diameter of boundary 211D. Assuming that the inner diameter of the opening 213A is ΦA and the diameter of the boundary 211D is ΦB, the overlap amount X on one side is expressed by the following equation (1).

X=(ΦB−ΦA)/2 (1)
The appearance quality can be improved by covering the boundary 211D.

A groove portion 213B is formed in a part of the inner circumference of the cover member 213 . A convex portion 212A extending toward the outer circumference is formed on a portion of the outer circumference of the first group lens holding member 212 . Grooves 213B and projections 212A are assembled when they are not overlapping when viewed from the optical axis direction, and by rotating cover member 213, projections 212A enter grooves 213B. Thereby, the cover member 213 is positioned with respect to the first group lens holding member 212 in the optical axis direction. Note that the first group lens holding member 212 may be provided with a groove, and the cover member 213 may be provided with a convex portion.

A predetermined backlash (first gap) Y is formed between the first group lens holding member 212 and the cover member 213 in a direction (radial direction) orthogonal to the optical axis direction. Since the predetermined backlash Y is smaller than the overlap amount X of the cover member 213, the cover member 213 can cover the boundary 211D even when the first group lens holding member 212 or the cover member 213 moves by the predetermined backlash Y.

Since the cover member 213 is positioned with the first group lens holding member 212 in the optical axis direction, it can move integrally with the first group lens holding member 212 in the optical axis direction. The outer diameter of the cover member 213 is fitted with the inner diameter of the opening 204F of the front exterior member 204 . The backlash (second gap) formed between the front exterior member 204 and the cover member 213 by the fitting in the direction perpendicular to the optical axis direction is minute and smaller than the predetermined backlash Y. FIG.

The cover member 213 has a rotation restricting key (projection) 213C, and the front exterior member 204 has a rotation restricting groove (groove) 204E corresponding to the rotation restricting key 213C. Accordingly, when the front exterior member 204 is assembled, the rotation restriction key 213C enters the rotation restriction groove 204E, and the rotation of the cover member 213 is restricted. Therefore, it is possible to prevent the cover member 213 from rotating and coming off the first group lens holding member 212 . Note that the cover member 213 may be provided with a rotation restricting groove, and the front exterior member 204 may be provided with a rotation restricting key. That is, it is sufficient that one of the cover member 213 and the front exterior member 204 has a rotation restricting key and the other has a rotation groove.

The optical axis direction sealing member 214 is a member for splash and dust proofing, and is a subject-side surface facing the imaging surface side surface (first surface) 213D of the cover member 213 and the surface 213D of the first group lens holding member 212. (Second surface) 212B and seals between surfaces 213D and 212B. It is desirable that the surface 213D and the surface 212B are the entire circumference, but they may be part of the circumference. By sandwiching the optical axis direction sealing member 214 in the optical axis direction, the cover member 213 and the first group lens holding member 212 are urged in the optical axis direction, and play in the optical axis direction can be reduced.

Further, in order to maintain a predetermined backlash Y, the optical axis direction seal member 214 has a clearance larger than the predetermined backlash Y ( gap) is formed. The optical axis direction sealing member 214 is made of a material that can be elastically deformed, such as rubber or sponge, and can absorb a predetermined backlash Y. As shown in FIG.

The radial direction sealing member 215 is a member for drip and dust protection, and is arranged in a state of being sandwiched between the cover member 213 and the opening 204F in a direction orthogonal to the optical axis direction. The radial sealing member 215 on the right-eye optical system 201R side is arranged at a position that blocks the effective light flux of the left-eye optical system 201L, and the radial sealing member 215 on the left-eye optical system 201L side blocks the effective light flux of the right-eye optical system 201R. placed in a blocking position.

With the configuration described above, it is possible to realize the lens device 200 that can achieve both dustproof/splashproof performance and optical performance while maintaining appearance quality, and that is capable of stereoscopic photography with an angle of view exceeding 180 degrees. Since the 1st group lens holding member 212 is not directly fitted in the opening 204F of the front exterior member 204, even if the 1st group lens holding member 212 is displaced due to a manufacturing error or the like, the position can be corrected. never Therefore, the optical performance and the relative error between the right-eye optical system 201R and the left-eye optical system 201L do not change even if the front exterior member 204 is incorporated.

FIG. 9 is a diagram showing the positional relationship between each optical axis of the lens device 200 and the image circle on the imaging element 111. As shown in FIG.

On the imaging device 111, a right-eye image circle ICR with an effective angle of view formed by the right-eye optical system 201R and a left-eye image circle ICL with an effective angle of view formed by the left-eye optical system 201L are imaged in parallel. tie the It is preferable to set the diameter ΦD2 of the image circles and the distance between the image circles so that the image circles do not overlap each other as much as possible. For example, the light-receiving range of the image sensor 111 is divided into left and right halves at the center, and the center of the right-eye image circle ICR is positioned approximately in the center of the right region, and the left-eye image circle ICR is located approximately in the center of the left region. It is preferable to set so that the center of the circle ICL is positioned.

Each optical system is a wide-angle fisheye lens. In this embodiment, each optical system is a circular fisheye lens, and the image formed on the imaging plane is a circular image covering a range of angle of view exceeding 180 degrees, and the left and right lenses are shown in FIG. Two circular images are formed on each of the . The longer the distance (base line length) L1 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, the greater the stereoscopic effect during viewing. For example, assume that the size of the image sensor 111 is 24 mm long×36 mm wide, the diameter ΦD2 of the image circle is 17 mm, the distance L2 between the third optical axes OA3R and OA3L is 18 mm, and the length of the second optical axis is 21 mm. When each optical system is arranged such that the second optical axis extends in the horizontal direction, the base line length L1 is 60 mm, which is approximately equal to the interpupillary distance of an adult. Further, by making the diameter ΦD of the lens mount 202 shorter than the base line length L1 and the distance L2 between the third optical axes shorter than the diameter ΦD of the lens mount 202, the lens arranged on the third optical axis is Arrangement inside the lens mount 202 becomes possible. When viewed as a VR, it is said that the angle of view at which a stereoscopic effect can be obtained is about 120 degrees. In this embodiment, since the effective angle of view exceeds 180 degrees, the diameter ΦD2 of the image circle in this embodiment is larger than the diameter ΦD3 of the image circle within the range of 180 degrees.

FIG. 10 is a diagram showing reflection of the left-eye optical system 201L when an image is captured by the right-eye optical system 201R. The wall portion 204D of the front exterior member 204 is imaged inside the diameter ΦD2 of the image circle, which is the effective angle of view, but is not imaged at the angle of view of 180 degrees, and is outside the image circle within the range of the angle of view of 180 degrees. The image is taken outside the diameter ΦD3. Therefore, when viewing as VR, there is no effect when viewing at a field angle of 180 degrees. For example, within the effective angle of view of the right-eye optical system 201R, there are the first group lens 211L of the left-eye optical system 201L in the left-eye region 20L, the cover member 213, and the wall portion 204D of the front exterior member 204. As indicated by 10, it is reflected in the actual effective imaging range. Only the first group lens 211L is reflected within the image circle with an angle of view of 180 degrees (inside the diameter ΦD3), but the cover member 213 and the wall portion 204D are outside the image circle with an angle of view of 180 degrees. Also, the reflection of the wall portion 204D is imaged outside (left side in FIG. 10) of the vertex portion of the first group lens 211L even when viewed in the horizontal direction. In the case of image processing or image editing, if the outer side of the vertex indicated by the straight line Z of the first group lens 211L, which is always reflected due to the specifications, is cut, the reflection of the wall portion 204D does not affect. The same applies to the reflection of the right-eye optical system 201R when the image is captured by the left-eye optical system 201L. As described above, although the wall portion 204D is within the effective angle of view, it is arranged so as to have almost no effect on imaging for actual VR applications.

The structure of the lens cap 400 detachably attached to the lens device 200 in one action will be described below. FIG. 11 is an external perspective view of the lens cap 400 attached to the lens device 200. FIG. FIG. 12 is an external perspective view of the lens cap 400 attached to the lens device 200 (not shown). FIG. 13 is an external perspective view of the lens cap 400 when attached to and detached from the lens device 200 (not shown). FIG. 14 is an exploded perspective view of the lens cap 400. FIG.

The lens cap 400 has a base 401, sliders (slider members) 402A and 402B, and springs 403A and 403B. The sliders 402A and 402B have the same shape, are connected in a phase rotated by 180 degrees, and are incorporated in the base 401 . The slider 402A (402B) has an operation portion 402A2 (402B2), a coupling portion 402A3 (402B3) that fits with the lens device 200, and a stopper portion 402A4 (402B4) that contacts the base 401. Further, the slider 402A (402B) has a connecting portion arranged between the optical axis of the first group lens 211R and the optical axis of the first group lens 211L. First optical axis The slider 402A (402B) is biased toward the operation section 402A2 (402B2) by a spring 403A (403B) incorporated in the base 401. As shown in FIG. The base 401 and the stopper portion 402A4 (402B4) are in contact with each other while the slider 402A (402B) is biased. By simultaneously pressing the operating portions 402A2 and 402B2 toward the coupling portions 402A3 and 402B3, the coupling portions 402A3 and 402B3 are opened and closed, and the lens cap 400 can be attached to and detached from the lens device 200. FIG. It should be noted that the lens cap 400 can be attached to and detached from the lens device 200 simply by pressing one of the operation parts.

The configuration of the lens cap 400 and the first group lens 211 when the lens cap 400 is attached will be described below. FIG. 15 is a sectional view of the lens cap 400 and the first group lens 211 when the lens cap 400 is attached. FIG. 16 is a side view of sliders 402A and 402B and first group lens 211 when lens cap 400 is attached. FIG. 17 is a top view of the sliders 402A and 402B and the first group lens 211 when the lens cap 400 is attached.

Sliders 402A and 402B are arranged between the first group lenses 211R and 211L arranged on the first optical axis OA1, and the sliders 402A and 402B and the first group lenses 211R and 211L are arranged on the same plane perpendicular to the optical axis direction. is provided. Thereby, the thickness in the optical axis direction can be reduced by the thickness of the slider 402 . Further, the operation units 402A2 and 402B2 are arranged in the central portion between the first group lenses 211R and 211L. Thereby, smooth operability can be realized.

FIG. 18 is a sectional view of the lens cap 400 and the first group lens 211 when the lens cap 400 of the modified example is attached.

Sliders 402A and 402B are arranged between the first group lenses 211R and 211L arranged on the first optical axis OA1, and the sliders 402A and 402B and the first group lenses 211R and 211R are arranged on the same plane perpendicular to the optical axis direction. Not provided. As a result, the thickness of the sliders 402A and 402B is increased, so that the weight of the lens device 200 is increased as the lens device 200 is increased in size. .

The arrangement of the coupling portions 203A, 203B, 203C, and 203D provided in the lens device 200 to be fitted with the coupling portions 402A3 and 402B3 will be described below. 19 to 21 are an external perspective view, an external side view, and an external bottom view of the lens device 200, respectively. The angle of view of the lens device 200 is within the range indicated by the dotted line G and exceeds 180 degrees toward the subject. If parts, etc., including the connecting portion, are provided on the object side from the range indicated by the dotted line G, they will be reflected in the image. Therefore, the coupling portions 203A, 203B, 203C, and 203D are provided outside the angle of view indicated by the dotted line G. In the present embodiment, the coupling portions 203A, 203B, 203C, and 203D are provided in a direction visible from the external direction, but the lens cap 400 is fitted to the lens device 200 from a direction invisible from the external direction, that is, from the inside. In some cases. Even in that case, by arranging the coupling portions 203A, 203B, 203C, and 203D outside the angle of view indicated by the dotted line G, it is possible to prevent them from being reflected in the image.

Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various combinations, modifications, and changes are possible within the scope of the gist.

200 lens device 204 front exterior member (exterior member)
204F opening (second opening)
211R 1 group lens (lens)
211L 1 group lens (lens)
212 1st group lens holding member (holding member)
213 cover member 213A opening (first opening)

Claims (19)

The lens closest to the subject,
a holding member that holds the lens;
a cover member having a first opening that exposes the lens when viewed from the optical axis direction of the lens, and positioned in the optical axis direction of the holding member;
an exterior member having a second opening fitted to the outer diameter of the cover member;
The first gap in the radial direction perpendicular to the optical axis direction formed between the holding member and the cover member corresponds to the second gap in the radial direction formed between the exterior member and the cover member. A lens device characterized in that it is larger than the gap between the 2. The lens device according to claim 1, wherein one of said cover member and said exterior member has a projection, and the other is formed with a groove that fits into said projection. 3. The lens device according to claim 1, wherein the lens, the holding member, and the cover member are integrally movable along the optical axis direction. A boundary between a lens surface of the lens on the subject side and a side surface of the lens or the holding member is positioned outside an inner circumference of the first opening when viewed from the optical axis direction. Item 4. The lens device according to any one of Items 1 to 3. 5. The lens according to claim 4, wherein even if the size of said first gap changes, said boundary is positioned outside the inner circumference of said first opening when viewed from said optical axis direction. Device. A seal disposed between an image-side first surface of the cover member and a second surface of the holding member opposite the first surface to seal between the first surface and the second surface. 6. A lens device according to any preceding claim, further comprising a member. The seal member is arranged with a gap larger than the first gap formed between the cover member and the holding member in a direction orthogonal to the optical axis direction. The lens device according to claim 6. 8. The lens device according to claim 1, wherein the cover member is arranged closer to the image side than the effective incident surface of the lens. 9. The mounting part for attaching to an imaging device capable of imaging a stereoscopic image by forming two images with parallax on one imaging plane and simultaneously imaging the imaging device. 1. The lens device according to claim 1. further comprising an exterior cover member covering the lens device;
The lens device is configured such that a lens cap is detachably attached,
the exterior cover member includes a coupling portion that fits with the lens cap,
10. The lens device according to any one of claims 1 to 9, wherein the coupling portion is arranged closer to the image side than the effective incident surface of the lens. The lens comprises a first lens included in the first optical system and a second lens included in the second optical system,
The cover member comprises a first cover member exposing the first lens and a second cover member exposing the second lens,
11. The lens device according to any one of claims 1 to 10, wherein the exterior member includes an opening into which the first cover member enters and an opening into which the second cover member enters. each of the first optical system and the second optical system is a bending optical system having two reflecting surfaces;
In the first optical system and the second optical system, a first optical axis closest to the subject, a second optical axis orthogonal to the first optical axis, a second optical axis parallel to the first optical axis and closest to the image side 12. The lens device according to claim 11, wherein three optical axes are set. 13. The lens device according to claim 11, wherein the first optical system and the second optical system are wide-angle fisheye lenses. 14. The lens apparatus according to any one of claims 11 to 13, wherein the first optical system and the second optical system are fisheye lenses capable of photographing at an angle of view exceeding 180 degrees. 15. The lens device according to any one of claims 11 to 14, wherein the first optical system and the second optical system are circular fisheye lenses. A lens cap detachably attached to the lens device according to any one of claims 11 to 15,
Having two slider members arranged between a first optical system including a first lens and a second optical system including a second lens,
A lens cap, wherein the two slider members, the first lens, and the second lens are provided on the same plane orthogonal to the optical axis direction of the first lens and the second lens. 17. A lens cap according to claim 16, wherein each of said two slider members comprises a connecting portion located between the optical axis of said first lens and the optical axis of said second lens. Each of the two slider members is arranged in the center between the optical axis of the first lens and the optical axis of the second lens, and has an operation part for detachably attaching the lens cap to the lens device. 18. A lens cap according to claim 16 or 17, comprising: 19. A lens cap according to any one of claims 16 to 18, wherein each of said two slider members has a coupling portion that engages with said lens device.

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