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发明授权
CN101373260B 摄像透镜及摄像装置 有权 转让

摄像透镜及摄像装置
摘要：
本发明提供一种摄像透镜，保持良好的光学性能的同时，谋求小的F值和小型化。该摄像透镜从物体侧依次具备：凸面朝向物体侧的负的第1透镜(L1)、凸面朝向物体侧的正弯月形透镜的第2透镜(L2)、光阑、凸面朝向像侧的正的第3透镜(L3)、和由第4透镜(L4)及第5透镜(L5)的接合而成的整体上具有正的折射力的接合透镜(LC)。而且，在将第2透镜(L2)相对于d线的阿贝数设为v2，将从第1透镜(L1)的物体侧的面顶点到像面为止在光轴上的距离设为L，将整个系统的焦距设为f，将整个系统的后截距设为Bf时，满足下述条件式(1)～(3)。v2＞30……(1)2.5＜L/f＜4.0……(2)0.5＜Bf/f＜1.3……(3)
摘要（英）：

The invention provides an imaging lens that has a small F number and a small size while maintaining a good optical performance. The imaging lens comprises, in order from an object side: a first lens that has a negative refractive power and is convex toward the object side; a second lens that has a positive refractive power and is a meniscus lens convex toward the object side; a stop; a third lensthat has a positive refractive power and is convex toward an image side; and a cemented lens that has a positive refractive power as a whole and is formed by cementing a fourth lens and a fifth lens,wherein assuming that an Abbe number of the second lens with respect to d-line is nu2, a distance on an optical axis from a vertex of a surface of the first lens facing toward the object side to an image plane of the imaging lens is L, a focal length of the imaging lens is f, and a back focus of the imaging lens is Bf, the following conditional expressions (1) to (3) are satisfied: nu2>30 (1), 2.5

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