| 摘要 |
A first lens made of a positive meniscus lens having a convex surface directed onto the object side, a second lens made of a biconcave lens, and a third lens made of a biconvex lens are successively disposed from the object side, and predetermined conditional expressions are satisfied, thus yielding an image readout imaging lens suitable for reading out the shorter side of A4-sized color originals and the like. Successively from the object side, a first lens L1 made of a positive meniscus lens having a convex surface directed onto the object side, a second lens L2 made of a biconcave lens, and a third lens L3 made of a biconvex lens are disposed, and the following conditional expressions (1) to (5) are satisfied:-0.36f<f2<-0.25f(1)-1.07<f2/f3<-0.74(2)0.26f<r4<0.32f(3)0.43<r4/r5<0.77(4)0.82<r1/r4<1.05(5)
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