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CN107430260B 斜视物镜光学系统和具备该斜视物镜光学系统的斜视用内窥镜 有权

斜视物镜光学系统和具备该斜视物镜光学系统的斜视用内窥镜
摘要：
提供一种高性能且小型的斜视物镜光学系统和具备该斜视物镜光学系统的斜视用内窥镜。斜视物镜光学系统由从物体侧起依次配置的具有负折射力的前侧透镜组(GF)、光路转换元件(P)、亮度光圈(S)以及具有正折射力的后侧透镜组(GR)组成，前侧透镜组(GF)由第一透镜(L1)和第二透镜(L2)组成，后侧透镜组(GR)由第三透镜(L3)和具有正折射力的接合透镜(CL)组成，第一透镜(L1)由使凹面朝向像面侧的负透镜组成，第二透镜(L2)由使凸面朝向像面侧的单透镜、或接合透镜组成，第三透镜(L3)由正透镜组成，接合透镜(CL)由弯月形状的负透镜(L5)和由双凸透镜组成的正透镜(L4)组成，该斜视物镜光学系统满足以下的条件式(1)至(3)。1.6
摘要（英）：

There is provided an oblique-viewing objective optical system having a high performance and a small size, and an endoscope for oblique-viewing using the same. The oblique-viewing objective optical system includes in order from an object side, a front-side lens group having a negative refractive power, an optical path converting element, an aperture stop, and a rear-side lens group having a positive refractive power. The front-side lens group includes a first lens and a second lens, and the rear-side lens group includes a third lens and a cemented lens having a positive refractive power. The first lens is a negative lens having a concave surface directed toward an image-plane side, and the second lens is a single lens having a convex surface directed toward the image-plane side or a cemented lens. The third lens is a positive lens, and the cemented lens includes a positive lens which is a biconvex lens, and a negative lens having a meniscus shape, and the following conditional expressions (1) to (3) are satisfied: 1.6 < D 1 / f < 4.7 1.0 < D 2 / f < 3.3 and 9.0 < L / f < 31.0

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