| 摘要 |
PROBLEM TO BE SOLVED: To provide an imaging lens that can improve optical performance while reducing size and weight. SOLUTION: The imaging lens includes, in order from an object side to an image surface side: a diaphragm 2, a first lens 3 having a positive power whose convex surface faces the object side, and a second lens 4 that is a meniscus lens having a negative power whose convex surface faces the object side, wherein a condition expressed by the following expression is to be satisfied: 0.4≤r<SB>1</SB>/FL≤0.55 (where, r<SB>1</SB>: center radius curvature of the object side face 3a of the first lens, and FL: focal length of the entire lens system). COPYRIGHT: (C)2010,JPO&INPIT
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