JP2011146885A - Lens barrel adapter, and lens barrel and imaging apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain stereoscopic imaging wherein pop-up feeling and depth feel can be enjoyed by setting the convergence to 3 degree or less in short distance thereby reducing the feeling of fatigue. <P>SOLUTION: On the first and second optical axes parallel to each other, a part of a light beam 300 on the second optical axis is reflected on a total reflection mirror 422 by opening the inside shutter part 410a and closing the outside shutter part 410b of the first shutter 410, and opening the inside shutter part 420a and closing the outside shutter part 420b of the second shutter 420, and then the reflected light beam 300 is further reflected on a half mirror 412 before being taken into a lens system. The remainder of the light beam 300 on the second optical axis is taken into the lens system via the total reflection mirror 422 and the half mirror 412 by closing the inside shutter part 410a and the outside shutter part 410b of the first shutter 410, and closing the inside shutter part 420a and opening the outside shutter part 420b of the second shutter 420. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel adapter, a lens barrel, and an imaging device using the lens barrel adapter that are used when shooting a video for viewing as a stereoscopic video.

  In recent years, digital still cameras and video cameras using an imaging element such as a charge coupled device (CCD) and a complementary metal-oxide semiconductor (CMOS) sensor have been widely used. In general, these digital still cameras and video cameras are provided with a lens barrel for imaging a light beam emitted from a subject on an image sensor and capturing an optical image of the subject.

  When an optical image is captured using such a lens barrel, it is desired to capture not only a two-dimensional image but also an image for viewing as a stereoscopic image. For example, Patent Document 1 discloses a stereoscopic video imaging apparatus. As shown in FIG. 11, the imaging apparatus includes two left and right shutters 11R and 11L and two left and right mirrors 12R and 12L arranged on the first optical axis and the second optical axis. The luminous flux of the subject on the first optical axis and the luminous flux of the subject on the second optical axis are reflected by the two left and right mirrors 12R and 12L and taken into the lens 14 via the prism 13. The light flux of the subject captured by the lens 14 is imaged by the CCD 15. While switching between the light flux on the first optical axis and the light flux on the second optical axis by the left and right shutters 11R and 11L, each light flux is imaged by the CCD 15, and the optical image on the first optical axis and the second An optical image on the optical axis is formed. The optical image on the first optical axis and the optical image on the second optical axis formed by the CCD 15 correspond to the right-eye video and the left-eye video for stereoscopic video, respectively. Since the right-eye video and the left-eye video have different optical axes, they have binocular parallax.

  In addition to Patent Literature 1, imaging devices that capture a right-eye video and a left-eye video having binocular parallax are disclosed in Patent Literature 2 and Patent Literature 3.

  The right-eye video and the left-eye video captured by these imaging devices can be viewed as a stereoscopic video using, for example, the stereoscopic video display device disclosed in Patent Document 4. The stereoscopic image display device alternately displays a right-eye image and a left-eye image having parallax on the screen of the display panel. When the right-eye video is projected, the viewer can view this video with the right eye, and when the left-eye video is projected, the viewer can view this video with the left eye. In order to view the right-eye image with the right eye and the left-eye image with the left eye, for example, shutter-type glasses are used. In the shutter-type glasses, a liquid crystal filter that switches between passage and blocking of light is arranged in the right-eye lens and the left-eye lens. By switching between light passing and blocking by opening and closing the shutter of the liquid crystal filter, the right eye image can be viewed with the right eye, and the left eye image can be viewed with the left eye. By continuing to open and close the shutter, the viewer can view a stereoscopic video from the right-eye video and the left-eye video having parallax. Note that the stereoscopic image has a sense of depth and pop-out depending on the amount of parallax between the right-eye video and the left-eye video. If the amount of parallax is large, the depth and pop-out will be large, and if the amount of parallax is small, the depth and pop-out will be small.

JP 2003-92771 A JP-A-8-307904 Japanese Utility Model Publication No. 1-155043 JP 2000-36939 A

  The right-eye video and the left-eye video for stereoscopic video have parallax with each other, but when the amount of parallax is large, the feeling of popping out and the depth of the video also increase. If this pop-out feeling or depth feeling becomes too large, the viewer may feel tired. In order to capture the right-eye video and the left-eye video so that the amount of parallax does not become too large, it is desirable to set the convergence angle to 3 degrees or less. The convergence angle is an angle formed by the right eye and the left eye when viewed from the subject.

  The convergence angle in the imaging apparatus disclosed in Patent Document 1 corresponds to the angle formed by the left and right mirrors 12R and 12L when viewed from the subject. The convergence angle becomes smaller as the distance between the subject and the imaging device becomes longer, and becomes larger as the distance between the subject and the imaging device becomes shorter. Further, this convergence angle is affected by the distance between the left and right mirrors 12R and 12L. If the distance between the first optical axis and the second optical axis corresponding to the image for the right eye or the image for the left eye is narrow, the convergence angle seen from the subject becomes small, and the distance between the first optical axis and the second optical axis can be widened. For example, the angle of convergence seen from the subject increases.

  In general, when capturing a right-eye image and a left-eye image that are desirable as stereoscopic images, the interval between the first optical axis and the second optical axis captured by the imaging apparatus is often set to 70 mm to 90 mm. This interval is called a stereo base.

  When the stereo base is set to 70 mm to 90 mm, for example, when a stereoscopic image is to be captured at a short distance of about 1 m to 5 m, it is difficult for the conventional imaging apparatus to set the convergence angle to 3 degrees or less. In general, the distance between the subject and the imaging device for enjoying a sense of popping out and a sense of depth of a stereoscopic image is limited to a short distance.

  That is, if the convergence angle is set to 3 degrees or less at a short distance, it is possible to capture a stereoscopic image that does not feel fatigue and can provide a feeling of popping out and a feeling of depth.

  However, in the above conventional imaging device, the convergence angle cannot be reduced to 3 degrees or less at a short distance, so that the viewer may be tired from the feeling of popping out and feeling of depth, and the stereoscopic image cannot be fully enjoyed. Had.

  The present invention solves the above-described problem, and a lens barrel adapter and a lens that can capture a stereoscopic image in which a convergence angle is reduced to 3 degrees or less at a short distance, a feeling of fatigue is reduced, and a feeling of popping out and a feeling of depth can be enjoyed. An object of the present invention is to provide a lens barrel and an imaging device using the same.

  In order to achieve the above object, a lens barrel adapter according to the present invention is a lens barrel provided with a lens system or an image pickup device provided with the lens barrel, and the lens barrel adapters are mutually connected. A first shutter and a half mirror disposed on the first optical axis and a second shutter and a total reflection mirror disposed on the second optical axis are provided on the parallel first optical axis and the second optical axis. The first shutter has an inner shutter portion close to the second optical axis and an outer shutter portion far from the second optical axis, and the second shutter has an inner shutter portion close to the first optical axis and the An outer shutter portion far from the first optical axis, and the light flux on the first optical axis opens the inner shutter portion and the outer shutter portion of the first shutter, and the inner shutter portion and the outer shutter of the second shutter. Close the part A light beam transmitted through a mirror is taken into the lens system, and a part of the light beam on the second optical axis opens the inner shutter portion of the first shutter and closes the outer shutter portion, and the inner shutter portion of the second shutter. And the outer shutter part is closed, the light beam reflected by the total reflection mirror is reflected by the half mirror and taken into the lens system, and the remaining part of the light beam on the second optical axis is inside the first shutter. The shutter portion and the outer shutter portion are closed, the inner shutter portion of the second shutter is closed, and the outer shutter portion is opened, and the lens system is captured via the total reflection mirror and the half mirror.

  In order to achieve the above object, a lens barrel according to the present invention includes a first shutter and a half mirror disposed on the first optical axis on a first optical axis and a second optical axis that are parallel to each other, and a second mirror. A lens barrel having a second shutter and a total reflection mirror disposed on the optical axis, and a lens system, wherein the first shutter is formed from an inner shutter portion close to the second optical axis and the second optical axis. A far outer shutter part, and the second shutter has an inner shutter part near the first optical axis and an outer shutter part far from the first optical axis, and the light flux on the first optical axis is: The inner shutter portion and the outer shutter portion of the first shutter are opened, the inner shutter portion and the outer shutter portion of the second shutter are closed, and the light flux that has passed through the half mirror is taken into the lens system, and the second optical axis A part of the upper luminous flux is the first The inner shutter portion of the shutter is opened and the outer shutter portion is closed, the inner shutter portion of the second shutter is opened and the outer shutter portion is closed, and the light beam reflected by the total reflection mirror is reflected by the half mirror and the lens The remaining portion of the light flux on the second optical axis is closed by closing the inner shutter portion and the outer shutter portion of the first shutter, closing the inner shutter portion of the second shutter, and opening the outer shutter portion. The lens system is configured to take in through the reflecting mirror and the half mirror.

  In order to achieve the above object, an imaging apparatus of the present invention has a lens barrel having a lens system or a barrel adapter attached to the imaging apparatus, and the barrel adapters have first optical axes that are parallel to each other. A first shutter and a half mirror disposed on the first optical axis and a second shutter and a total reflection mirror disposed on the second optical axis at the second optical axis, and the first shutter Has an inner shutter part close to the second optical axis and an outer shutter part far from the second optical axis, and the second shutter is far from the inner shutter part close to the first optical axis and the first optical axis. An outer shutter portion, and the luminous flux on the first optical axis opens the inner shutter portion and the outer shutter portion of the first shutter, closes the inner shutter portion and the outer shutter portion of the second shutter, and Transmitted through half mirror The bundle is taken into the lens system, and a part of the light flux on the second optical axis opens the inner shutter part of the first shutter and closes the outer shutter part, opens the inner shutter part of the second shutter and opens the outer side. The shutter part is closed, the light beam reflected by the total reflection mirror is reflected by the half mirror and taken into the lens system, and the remaining part of the light beam on the second optical axis is outside the inner shutter part and the outer side of the first shutter. The shutter unit is closed, the inner shutter unit of the second shutter is closed and the outer shutter unit is opened, and the lens system is captured via the total reflection mirror and the half mirror.

  In order to achieve the above object, the imaging apparatus of the present invention has a lens barrel, and the lens barrel is disposed on the first optical axis at the first optical axis and the second optical axis that are parallel to each other. The first shutter and half mirror, a second shutter and total reflection mirror disposed on the second optical axis, and a lens barrel having a lens system, the first shutter being the second optical axis An inner shutter portion close to the first optical axis and an outer shutter portion far from the first optical axis. The light beam on the first optical axis is a light beam that has passed through the half mirror by opening the inner shutter portion and the outer shutter portion of the first shutter and closing the inner shutter portion and the outer shutter portion of the second shutter. Into the lens system, A part of the light flux on two optical axes opens the inner shutter part of the first shutter and closes the outer shutter part, opens the inner shutter part of the second shutter and closes the outer shutter part, and the total reflection mirror The light beam reflected at the second mirror is reflected by the half mirror and taken into the lens system, and the remaining part of the light beam on the second optical axis closes the inner shutter portion and the outer shutter portion of the first shutter, In this configuration, the inner shutter portion is closed and the outer shutter portion is opened, and taken into the lens system via the total reflection mirror and the half mirror.

  According to the present invention, in the first optical axis and the second optical axis that are parallel to each other, the light beam on the first optical axis and the light beam on the second optical axis are passed through the respective lens systems, and the lens system of the lens barrel. Therefore, the right-eye video and the left-eye video having parallax can be captured.

  In addition, a part of the light flux on the second optical axis opens the inner shutter portion of the first shutter and closes the outer shutter portion, opens the inner shutter portion of the second shutter and closes the outer shutter portion, and the total reflection mirror The light beam reflected by is reflected by the half mirror and taken into the lens system, and the remaining part of the light beam on the second optical axis closes the inner shutter portion and the outer shutter portion of the first shutter, and closes the inner shutter portion of the second shutter. At the same time, since the outer shutter portion is opened and taken into the lens system via the total reflection mirror and the half mirror, the distance between the first optical axis and the second optical axis can be reduced. That is, the convergence angle can be reduced to 3 degrees or less at a short distance while reducing the size of the stereo base.

  Therefore, it is possible to capture a stereoscopic image that reduces the feeling of fatigue and enjoys a feeling of popping out and a feeling of depth.

Sectional drawing of the lens barrel of the imaging device in one embodiment Schematic diagram of the imaging device Schematic of the lens system arranged in the lens barrel of the imaging device Schematic of the same imaging device with a lens barrel adapter Schematic showing the imaging state due to incidence from the first optical axis Schematic showing an imaging state by incidence from the right side of the second optical axis Schematic showing an imaging state by incidence from the left side of the second optical axis Schematic showing the incidence from the first optical axis and the light shielding area of the liquid crystal shutter Schematic showing the incidence from the second optical axis and the light shielding area of the liquid crystal shutter Schematic showing the incidence from the second optical axis and the light shielding area of the liquid crystal shutter Schematic diagram of lens system of conventional imaging device

  Hereinafter, an imaging apparatus according to an embodiment will be described with reference to the drawings. 1 is a cross-sectional view of a lens barrel of an imaging apparatus according to an embodiment, FIG. 2 is a schematic diagram of the imaging apparatus, and FIG. 3 is a schematic diagram of a lens system disposed in the lens barrel of the imaging apparatus.

<About Overall Configuration of Lens Barrel 100>
First, the overall configuration of the lens barrel 100 will be described. In FIG. 1, a lens barrel 100 includes a barrel main body 105, a first lens system 110, a second lens system 120, a third lens system 130, and a fourth lens system 140 held inside the barrel main body 105. And a diaphragm 150. As shown in FIG. 2, the imaging apparatus 200 is configured by attaching a lens barrel 100 to an imaging apparatus main body 210. The imaging device main body 210 is provided with an imaging element 230 for capturing an optical image of the subject via the prism 220.

  As shown in FIGS. 1 to 3, the first lens system 110 disposed in the lens barrel 100 is fixedly disposed at the distal end portion of the barrel main body 105, and first captures the light beam 300 emitted from the subject. The second lens system 120 is disposed on the barrel main body 105 so as to be movable on the optical axis behind the first lens system 110, and takes in the luminous flux 300 of the subject via the first lens system 110. The third lens system 130 is disposed behind the second lens system 120 and fixed to the lens barrel body 105 so as not to move on the optical axis. The third lens system 130 captures the light flux 300 of the subject through the second lens system 120. Yes. The fourth lens system 140 is disposed on the barrel main body 105 so as to be movable in the optical axis direction behind the third lens system 130, and takes in the light flux 300 of the subject via the third lens system 130. The diaphragm 150 is disposed in front of the third lens system 130.

  The first lens system 110, the second lens system 120, the third lens system 130, and the fourth lens system 140 are each configured by combining one or more lenses. The second lens system 120 is a zoom lens system that performs zoom adjustment to the wide-angle side or the telephoto side. There is a zoom function that changes to the wide-angle side when close to the first lens system and to the telephoto side when close to the third lens system, and has a negative focal length.

  The combined focal length of the first lens system 110 and the second lens system 120 is a small (strong) negative focal length. Further, by combining the third lens system 130, it is converted into a positive or large (weak) negative focal length. That is, the third lens system 130 is a correction lens system for converting to a real image in order to form an image on the image sensor 230, and has a positive focal length.

  The fourth lens system 140 is a focusing lens system for adjusting the focus, and has a positive focal length. When the fourth lens system is closer to the third lens system, the positive focal length becomes smaller, and when the fourth lens system becomes farther, the positive focal distance becomes larger. Therefore, zoom adjustment is performed mainly by moving the second lens system 120 on the optical axis. The focus adjustment is mainly performed by moving the fourth lens system 140 on the optical axis.

  As described above, the light flux 300 from the subject is imaged on the element surface of the image sensor 230 through the first lens system 110, the second lens system 120, the third lens system 130, and the fourth lens system 140, and is optically imaged. It becomes. In addition, a bright image can be formed by increasing the diameter of the diaphragm 150, and a dark image can be formed by reducing the diameter.

<Overall Configuration of Imaging Device 200 Attached with Lens Barrel Adapter 400>
Next, the overall configuration of the imaging apparatus 200 to which the lens barrel adapter 400 is attached will be described. FIG. 4 is a schematic view of the image pickup apparatus to which the lens barrel adapter is attached.

  In FIG. 4, the lens barrel adapter 400 is attached to the imaging device 200. The lens barrel adapter 400 includes a first shutter 410 arranged on the first optical axis, a half mirror 412 arranged behind the first optical axis and a second optical axis parallel to each other, and a second light. It has the 2nd shutter 420 arrange | positioned on an axis | shaft, and the total reflection mirror 422 arrange | positioned in the back. The half mirror 412 transmits a part of the light beam 300 and reflects a part thereof, and the total reflection mirror 422 reflects the whole light beam 300. The first optical axis and the second optical axis that are parallel to each other need not be completely parallel, and the first optical axis and the second optical axis that are substantially parallel or substantially parallel to each other. Including two optical axes.

  The first shutter 410 and the second shutter 420 are arranged in the horizontal direction, and the first optical axis and the second optical axis are also located in the horizontal direction. The light beam 300 is blocked when the first shutter 410 and the second shutter 420 are closed, and the light beam 300 is transmitted when the first shutter 410 and the second shutter 420 are opened.

  The first shutter 410 has a side closer to the second optical axis as an inner shutter part 410a and a side far from the second optical axis as an outer shutter part 410b. The second shutter 420 has a side closer to the first optical axis as an inner shutter part 420a and a side far from the first optical axis as an outer shutter part 420b.

  The separation position where the inner shutter portion 410a and the outer shutter portion 410b of the first shutter 410 are separated does not have to be the center position in the width direction of the first shutter 410, and is a position closer to the second optical axis than the center position. A position farther from the second optical axis may be used.

  Further, the separation position where the inner shutter part 420a and the outer shutter part 420b of the second shutter 420 are separated does not have to be the center position in the width direction of the second shutter 420, and is closer to the first optical axis than the center position. It may be a position farther from the position or the first optical axis.

  The imaging of the light flux 300 on the first optical axis and the light flux 300 on the second optical axis using the first shutter 410 and the second shutter 420 will be described.

  The light beam 300 on the first optical axis opens the inner shutter portion 410a and the outer shutter portion 410b of the first shutter 410, closes the inner shutter portion 420a and the outer shutter portion 420b of the second shutter 420, and passes through the half mirror 412. The obtained light beam 300 is taken into the first lens system 110, the second lens system 120, the third lens system 130, and the fourth lens system 140, and is exposed on the element surface of the image sensor 230 to take an image.

  A part of the light beam 300 on the second optical axis opens the inner shutter portion 410a of the first shutter 410 and closes the outer shutter portion 410b, opens the inner shutter portion 420a of the second shutter 420 and closes the outer shutter portion 420b. Then, the light beam 300 reflected by the total reflection mirror 422 is reflected by the half mirror 412, and taken into the first lens system 110, the second lens system 120, the third lens system 130, and the fourth lens system 140, and The element surface is exposed and imaged.

  The remaining part of the light beam 300 on the second optical axis is totally reflected by closing the inner shutter part 410a and the outer shutter part 410b of the first shutter 410, closing the inner shutter part 420a of the second shutter 420 and opening the outer shutter part 420b. The images are taken into the first lens system 110, the second lens system 120, the third lens system 130, and the fourth lens system 140 through the mirror 422 and the half mirror 412, and are exposed on the element surface of the image sensor 230 to take an image.

  Note that the light flux 300 on the first optical axis and the light flux 300 on the second optical axis are exposed and imaged on the element surface of the image sensor 230 while switching alternately. The video on each optical axis corresponds to the video for the right eye and the video for the left eye that have parallax with each other. The light beam 300 on the second optical axis is separated into a part and the remainder of the light beam 300 on the second optical axis, each of which is a right-eye image or a left-eye image in an image on the second optical axis. Corresponding to

<About imaging by incidence from the first optical axis>
Next, imaging by incidence from the first optical axis will be described in detail.

  FIG. 5 is a schematic diagram showing an imaging state by incidence from the first optical axis. In FIG. 5, the first shutter 410 on the first optical axis arranged on the first optical axis is opened to a transmission state. Both the inner shutter portion 410a and the outer shutter portion 410b of the first shutter 410 are opened to be in a transmissive state. The light beam that has passed through the first shutter 410 then passes through the half mirror 412. At this time, half of the luminous flux 300 is reflected in the right direction (direction away from the second optical axis), and the remaining half of the luminous flux 300 is transmitted and enters the lens barrel 100. The light beam 300 incident on the first lens system 110 of the lens barrel 100 passes through the second lens system 120, the stop 150, the third lens system 130, and the fourth lens system 140, and exposes the image sensor 230.

  In addition, the second shutter 420 installed on the second optical axis is in a light shielding state. Both the inner shutter part 420a and the outer shutter part 420b of the second shutter 420 are closed to be in a light shielding state. Therefore, the light beam 300 incident from the second optical axis is shielded by the second shutter 420 on the second optical axis. That is, since the light does not enter the total reflection mirror 422 disposed behind the second shutter 420, there is almost no light flux 300 from the second optical axis toward the half mirror 412 on the first optical axis. A real image can be exposed on the element surface of the image sensor 230 only by the light beam 300 from the first optical axis.

<Imaging by incidence from the right side of the second optical axis>
Next, imaging by incidence from the right side of the second optical axis will be described in detail.

  The light beam incident from the second optical axis is divided into two images and each has a different imaging method. The light beam incident from the second optical axis will be described separately on the right side (side closer to the first optical axis) and the left side (side far from the first optical axis) with respect to the optical axis.

  First, imaging by incidence from the right side of the second optical axis (side closer to the first optical axis) will be described. FIG. 6 is a schematic view showing an imaging state by incidence from the right side of the second optical axis. In FIG. 6, the inner shutter portion 410a of the first shutter 410 disposed on the first optical axis is brought into a transmissive state. A part of the light beam incident from the second optical axis first enters the inner shutter portion 410 a of the first shutter 410. Since the inner shutter portion 410 a is in a transmissive state, the light beam 300 that has passed through the inner shutter portion 410 a is incident on the half mirror 412. Of the light beam 300 incident on the half mirror 412, half of the light beam 300 is reflected away from the second optical axis, and the remaining half of the light beam 300 is transmitted. The transmitted light beam 300 enters the inner shutter portion 420a of the second shutter 420 disposed on the second optical axis. The light beam that does not pass through the inner shutter portion 410a is directly incident on the inner shutter portion 420a as it is.

  The inner shutter portion 420a of the second shutter 420 is set in a transmissive state. The light flux 300 that has passed through the half mirror 412 disposed on the first optical axis and the light flux 300 that directly enters the inner shutter portion 420a pass through the inner shutter portion 420a, and then approach the first optical axis by the total reflection mirror 422. Reflect in the direction. That is, the light beam reflected by the total reflection mirror 422 enters the half mirror 412.

  Half of the light beam 300 incident on the half mirror 412 is reflected and incident on the first lens system of the lens barrel 100. The remaining half of the light beam 300 passes through the half mirror 412. Since the outer shutter portion 410b of the first shutter 410 is in a light shielding state, the light flux 300 incident on the outer shutter portion 410b is shielded from light.

  The light beam incident on the first lens system 110 of the lens barrel 100 passes through the second lens system 120, the diaphragm 150, the third lens system 130, and the fourth lens system 140, and then exposes the left half of the image sensor 230. It will be.

  With respect to the light beam 300 incident from the left side of the second optical axis (the side far from the first optical axis), the light beam 300 incident on the outer shutter portion 420b of the second shutter 420 is shielded, so that the total reflection mirror 422 Almost no light beam 300 reaches.

  The light beam 300 incident from the left side of the first optical axis (side closer to the second optical axis) is as follows. Since the light flux 300 incident on the inner shutter portion 410a of the first shutter 410 is transmitted, it passes through the inner shutter portion 410a and then enters the half mirror 412. The light beam 300 on the side incident on the half mirror 412 is reflected in a direction away from the second optical axis, and the remaining light beam 300 is incident on the first lens system 110 of the lens barrel 100 as it is. The light beam 300 passes through the second lens system 120, the diaphragm 150, the third lens system 130, and the fourth lens system 140, and then exposes the right half of the image sensor 230. The image based on the exposed light beam 300 is not used as data because it is not information from the second optical axis.

  A light beam 300 incident from the right side of the first optical axis (the side far from the second optical axis) is as follows. Since the outer shutter portion 410b of the first shutter 410 is in a light shielding state, the light beam incident on the outer shutter portion 410b is shielded, and the light beam 300 hardly transmits through the lens barrel 100.

<Imaging by incidence from the left side of the second optical axis>
Next, imaging by incidence from the left side of the second optical axis (the side far from the first optical axis) will be described in detail. FIG. 7 is a schematic diagram showing an imaging state by incidence from the left side of the second optical axis. In FIG. 7, the inner shutter portion 420a of the second shutter 420 disposed on the second optical axis is in a light shielding state, and the outer shutter portion 420b is in a transmissive state. The inner shutter portion 410a of the first shutter 410 is in a light shielding state. The light beam 300 incident from the left side of the second optical axis enters the outer shutter unit 420b. Since the outer shutter portion 420b is in a transmissive state, the light flux 300 is transmitted and reflected by the total reflection mirror 422 in a direction approaching the first optical axis. The reflected light beam 300 enters the half mirror 412. Of the incident light beam 300, half of the light beam 300 is reflected and enters the first lens system 110 of the lens barrel 100. The remaining half of the light flux 300 passes through the half mirror 412 and enters the inner shutter portion 410 a of the first shutter 410. Since the inner shutter portion 410a is in a light shielding state, the light flux 300 is shielded from light. The light beam 300 reflected from the half mirror 412 passes through the first lens system 110, the second lens system 120, the diaphragm 150, the third lens system 130, and the fourth lens system 140 of the lens barrel 100, and then passes through the imaging element 230. The right half will be exposed.

  The light beam 300 incident from the right side of the second optical axis (the side close to the first optical axis) is as follows. Since the inner shutter portion 420a of the second shutter 420 is shielded, the light beam 300 incident on the inner shutter portion 420a almost follows the path of the total reflection mirror 422, the half mirror 412, and the outer shutter portion 410b of the first shutter 410. Absent.

  A light beam 300 incident from the left side of the first optical axis (side closer to the second optical axis) is as follows. Since the inner shutter portion 410a of the first shutter 410 is shielded, the light beam 300 incident on the inner shutter portion 410a does not enter the lens barrel 100.

  A light beam 300 incident from the right side of the first optical axis (the side far from the second optical axis) is as follows. Since the outer shutter portion 410b of the first shutter 410 is in a light-shielding state, the light beam 300 incident on the outer shutter portion 410b does not enter the lens barrel 100.

<About imaging by incidence from the second optical axis>
Next, imaging by incidence from the second optical axis will be described.

  As described above, the light beam 300 exposed to the left half of the image sensor 230 by the incident from the right half of the second optical axis and the right half of the image sensor 230 by the incident from the left half of the second optical axis are exposed. When combined with the luminous flux 300, the imaging information of the second optical axis can be obtained.

<Regarding Region Separation of First Shutter 410 and Second Shutter 420>
Next, region separation between the first shutter 410 and the second shutter 420 will be described.

  First, the incidence from the first optical axis and the light shielding region of the first shutter 410 will be described.

  FIG. 5 shows a light beam 300 having a focal length of 43.8 mm. At this time, the width of the half mirror 412 and the entire area of the inner shutter portion 410a and the outer shutter portion 410b of the first shutter 410 is 69 mm. As shown in FIG. 8, when the focal length is 82.1 mm, the entire area of the half mirror 412 and the inner shutter portion 410a and the outer shutter portion 410b of the first shutter 410 is not transmitted, and the outer end portion of the outer shutter portion 410b is not transmitted. The inner end 22.3 mm of 2.2 mm and the inner shutter portion 410a may be a transmission region or a light shielding region. As shown in FIG. 5, when the focal length is 43.8 mm, the angle of view was 53 degrees. As shown in FIG. 8, the angle of view is increased by 82.1 mm. Since it is 30 degrees, the effective ranges of the inner mirror part 410a and the outer shutter part 410b of the half mirror 412 and the first shutter 410 change.

  Next, incident from the right side of the second optical axis (side closer to the first optical axis) and the light shielding region of the second shutter 420 will be described.

  FIG. 6 shows a light beam 300 having a focal length of 43.8 mm. At this time, the width that transmits through the entire area of the total reflection mirror 422 and the inner shutter portion 420a of the second shutter 420 is 40.1 mm on the right side of 154.4 mm, and the focal length is 82.1 mm as shown in FIG. In this case, the entire area of the total reflection mirror 422 and the second shutter 420 is not transmitted, and 9.1 mm at the inner end of the inner shutter portion 420a may be a transmission region or a light shielding region. The light beam 300 reflected by the total reflection mirror 422 enters the half mirror 412, and the half light beam 300 enters the lens barrel 100. At this time, the outer shutter portion 410b of the first shutter 410 shields the entire area so that the light flux 300 from the first optical axis does not enter. However, since the inner shutter portion 410a needs to transmit the incident light beam from the right side of the second optical axis, the inner shutter portion 410a is in the transmissive state, but the range from the center of the inner shutter portion 410a to 14.1 mm is shielded even in the transmissive state. It does not matter even if it is in the state.

  Since the angle of view was 53 degrees when the focal length was 43.8 mm as shown in FIG. 6, the angle of view becomes 30 degrees by increasing the focal length to 82.1 mm as shown in FIG. The effective range of the total reflection mirror 412 and the inner shutter portion 420a of the second shutter 420 changes.

  Next, the outer shutter portion 420b of the second shutter 420 will be described.

  FIG. 7 shows a light beam 300 having a focal length of 43.8 mm. At this time, the width that transmits the entire reflection mirror 422 and the entire outer shutter portion 420b of the second shutter 420 is 114.3 mm on the left side of 154.4 mm, and the focal length is 82.1 mm as shown in FIG. The entire area of the total reflection mirror 422 and the outer shutter portion 420b of the second shutter 420 is not transmitted, and 70.1 mm outside the inner shutter portion 420a may be a transmission region or a light shielding region.

  Further, the light beam 300 reflected by the total reflection mirror 422 enters the half mirror 412 and enters the half light beam 300 lens barrel 100. At this time, the inner shutter portion 410a of the first shutter 410 may be shielded from light so that the light flux 300 from the first optical axis does not enter, and the range from the end of the first shutter 410 to 24.8 mm is Since it is not an effective image area, it may be in a transparent state.

  Since the angle of view was 53 degrees when the focal length was 43.8 mm as shown in FIG. 6, the angle of view becomes 30 degrees by increasing the focal length to 82.1 mm as shown in FIG. The effective range of the total reflection mirror 422 and the inner shutter portion 420a of the second shutter 420 changes.

<Summary of one embodiment>
According to one embodiment, according to the present invention, the light beam 300 on the first optical axis and the light beam 300 on the second optical axis are separated from each other in the first optical axis and the second optical axis that are parallel to each other. Thus, the right eye image and the left eye image having parallax can be captured.

  Further, a part of the light beam 300 on the second optical axis opens the inner shutter portion 410a of the first shutter 410 and closes the outer shutter portion 410b, opens the inner shutter portion 420a of the second shutter 420, and opens the outer shutter portion 420b. Is closed, the light beam 300 reflected by the total reflection mirror 422 is reflected by the half mirror 412 and taken into the zoom lens system, and the remaining part of the light beam 300 on the second optical axis is outside the inner shutter portion 410a of the first shutter 410 and the outer side. Since the shutter portion 410b is closed, the inner shutter portion 420a of the second shutter 420 is closed and the outer shutter portion 420b is opened and taken into the zoom lens system via the total reflection mirror 422 and the half mirror 412, the first optical axis and the second The interval between the optical axes can be reduced. That is, the convergence angle can be reduced to 3 degrees or less at a short distance while reducing the size of the stereo base.

  Therefore, it is possible to capture a stereoscopic image that reduces the feeling of fatigue and enjoys a feeling of popping out and a feeling of depth.

  In the present embodiment, the imaging apparatus 200 has been described in which the lens barrel adapter 400 in which the first shutter 410, the half mirror 412, the second shutter 420, and the total reflection mirror 422 are arranged is attached to the lens barrel 100. The same effect can be obtained by using the lens barrel 100 in which the first shutter 410, the half mirror 412, the second shutter 420, and the total reflection mirror 422 are arranged in advance, or the imaging apparatus 200 having the lens barrel 100.

  Further, depending on the focal length, there is a case where the imaging is not affected even if the shutter control is not performed on a part of the first shutter 410. When such a focal length is set, it is not necessary to cover the entire area of the first shutter 410 with the inner shutter section 410a and the outer shutter section 410b. The shutter may be controlled by covering with the shutter portion 410b. Alternatively, the entire area of the first shutter 410 may be covered with the inner shutter part 410a and the outer shutter part 410b separated into more shutter parts, and the shutter may be finely controlled.

  The present invention is applicable to digital still cameras, video cameras, and the like.

DESCRIPTION OF SYMBOLS 100 Lens barrel 105 Lens barrel body 110 1st lens system 120 2nd lens system 130 3rd lens system 140 4th lens system 150 Aperture 200 Imaging device 210 Imaging device body 220 Prism 230 Imaging device 300 Light flux 400 Lens barrel adapter 410 1st lens system 1 shutter 410a inner shutter part 410b outer shutter part 412 half mirror 420 second shutter 420a inner shutter part 420b outer shutter part 422 total reflection mirror

Claims (5)

A lens barrel provided with a lens system or a lens barrel adapter attached to an imaging device provided with the lens barrel,
The lens barrel adapter includes a first optical axis and a second optical axis that are parallel to each other.
A first shutter and a half mirror disposed on the first optical axis;
Having a second shutter and a total reflection mirror disposed on the second optical axis;
The first shutter has an inner shutter part close to the second optical axis and an outer shutter part far from the second optical axis,
The second shutter has an inner shutter part close to the first optical axis and an outer shutter part far from the first optical axis,
The luminous flux on the first optical axis is
Open the inner shutter portion and the outer shutter portion of the first shutter,
Close the inner shutter portion and the outer shutter portion of the second shutter,
The light beam transmitted through the half mirror is taken into the lens system,
A part of the light flux on the second optical axis is
Opening the inner shutter portion of the first shutter and closing the outer shutter portion;
Open the inner shutter part of the second shutter and close the outer shutter part,
The light beam reflected by the total reflection mirror is reflected by the half mirror and taken into the lens system,
The remainder of the luminous flux on the second optical axis is
Closing the inner shutter portion and the outer shutter portion of the first shutter;
Closing the inner shutter portion of the second shutter and opening the outer shutter portion;
A lens barrel adapter that takes in the lens system via the total reflection mirror and the half mirror. The lens barrel adapter according to claim 1, wherein the first shutter opens and closes only a part of the inner shutter portion. In the first optical axis and the second optical axis that are parallel to each other,
A first shutter and a half mirror disposed on the first optical axis;
A second shutter and a total reflection mirror disposed on the second optical axis;
A lens barrel having a lens system,
The first shutter has an inner shutter part close to the second optical axis and an outer shutter part far from the second optical axis,
The second shutter has an inner shutter part close to the first optical axis and an outer shutter part far from the first optical axis,
The luminous flux on the first optical axis is
Open the inner shutter portion and the outer shutter portion of the first shutter,
Close the inner shutter portion and the outer shutter portion of the second shutter,
The light beam transmitted through the half mirror is taken into the lens system,
A part of the light flux on the second optical axis is
Opening the inner shutter portion of the first shutter and closing the outer shutter portion;
Open the inner shutter part of the second shutter and close the outer shutter part,
The light beam reflected by the total reflection mirror is reflected by the half mirror and taken into the lens system,
The remainder of the luminous flux on the second optical axis is
Closing the inner shutter portion and the outer shutter portion of the first shutter;
Closing the inner shutter portion of the second shutter and opening the outer shutter portion;
A lens barrel that is taken into the lens system via the total reflection mirror and the half mirror. The lens barrel according to claim 3, wherein the first shutter opens and closes only a part of the inner shutter portion. An imaging apparatus comprising the lens barrel according to claim 3.

Images