| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact, high-performance imaging lens capable of sufficiently securing the inside spacing for arranging a shutter mechanism while maintaining high aberration performance coping with high-pixels. SOLUTION: The imaging lens comprises, in order from an object side: a first lens G1 having positive refractive power; a second lens G2 having negative refractive power whose concave surface faces the object; and a third lens G3 having positive refractive power and having a positive meniscus form that has a convex surface, facing the object, in a portion at and around an optical axis of the imaging lens; wherein the imaging lens satisfies conditional expressions given below: (1) 0.7<f1/f<1.3, (2) 0.2<D2/f<0.6, (3) 0.3<¾f2/f¾<0.8 and (4) 0.5<f3/f<0.8, where f: a focal length of an overall system, f1: a focal length of the first lens G1, f2: a focal length of the second lens G2, f3: a focal length of the thrid lens G3, and D2: a spacing, on the optical axis Z1, between the first lens G1 and the second lens G2. COPYRIGHT: (C)2008,JPO&INPIT
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