OPTICAL SYSTEM AND IMAGE-CAPTURING SYSTEM

• Main Authors: SAWAGUCHI SATOSHI, TAKENAKA HIROICHI, TERAO NORIYUKI, YAMAMOTO HIDEAKI, HARADA TORU, ITO YOICHI, TANAKA TOMONORI, SHOHARA MAKOTO, TAKASU SHUSAKU, IMAE NOZOMI, SATO HIROYUKI, IRINO YOSHIAKI, MASUDA KENSUKE, BESSHO DAISUKE
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2017
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To reduce the parallax of two image-capturing units that constitute an image-capturing system.SOLUTION: Provided is an omnidirectional image-capturing system in which two image-capturing systems of the same construction having a wide-angle lens whose view angle is wider than 180 degrees and an image-capturing sensor for capturing an image by the wide-angle lens are combined, and images captured by each image-capturing system are synthesized and an image within 4π radian of solid angle is obtained. The wide-angle lens of each image-capturing system, with a front group, a reflection surface, and a rear group arranged from an object side toward an image side, bends the optical axis of the front group toward the rear group by the reflection surface, two wide-angle lenses being combined so that the optical axes of the front group are matched or brought closer, the direction of the front group is reversed, and the optical axes of the rear group are parallel to each other and the directions of the rear group are reversed to each other. The reflection surface RF is a reflecting film used in common to the two wide-angle lenses, which, together with both of two optical equivalent transparent members PA, PB holding it therebetween, constitutes a commonized reflection surface member, the reflection surface member being held by a common lens barrel to which are assembled each front group and each rear group of the two wide-angle lenses.SELECTED DRAWING: Figure 1 【課題】撮像システムを構成する２つの撮像部の視差を小さくする。【解決手段】１８０度より広い画角の広角レンズと、広角レンズによる像を撮像する撮像センサとを有する同一構造の撮像系を２つ組合わせ、各撮像系により撮像された像を合成して４πラジアンの立体角内の像を得る全天球型の撮像システムであって、各撮像系の広角レンズは、物体側から像側へ向かって前群、反射面、後群を配し、前記反射面により前群の光軸を前記後群に向かって折り曲げるものであり、２個の広角レンズは、前群の光軸同士を合致もしくは近接させて、前群の向きが逆になり、後群の光軸が互いに平行で後群同士の向きが互いに逆になるように組合わせられ、反射面ＲＦが２個の広角レンズに共通化された反射膜で、これを挟持する光学的に等価な２つの透明部材ＰＡ、ＰＢとともに、共通化された反射面部材をなし、２個の広角レンズの各前群および各後群を組み付ける共通の鏡筒部分に反射面部材を保持させたことを特徴とする。【選択図】図１