| 摘要 |
PROBLEM TO BE SOLVED: To secure excellent optical performance, while attaining a wide-viewing angle and miniaturization in a super-wide imaging lens. SOLUTION: The super-wide imaging lens 1 is constituted, by arranging a negative first lens L1 that is a meniscus-turning its convex surface into an object side, a negative second lens L2 turning its concave surface to an image side and having at least one aspherical surface, a positive third lens L3 turning its convex surface to the object side and having at least one aspherical surface, a diaphragm and a positive fourth lens L4, with its convex surface turned to the image side and having at least one aspherical surface, in this order starting from the object side. If the distance on an optical axis, from the surface of the first lens L1 on the object side to an image forming surface, is defined as L and the synthetic focal distance of the third lens L3 and the fourth lens L4 is defined as f<SB>34</SB>, they satisfy the conditional expression (1): -3.2<L/f<SB>34</SB><3.2. COPYRIGHT: (C)2009,JPO&INPIT
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