| 摘要 |
This imaging lens comprises, in order, from the object side: a first lens that has a convex shape on the object side, and has positive refractive power; a second lens that has a concave shape on the image side, and has negative refractive power; a third lens that has a bi-convex shape or a plano-convex shape, wherein the convex surface faces the image side, in a paraxial region, and has positive refractive power; a fourth lens that has an asperhical shape on both sides, and has negative refractive power; and a fifth lens that has an asperhical shape on both sides, has a concave shape on the image side in the paraxial region, and has negative refractive power. The imaging lens satisfies the conditional expressions below. &ngr;2 is the Abbe number of the second lens, and &ngr;4 is the Abbe number of the fourth lens. &ngr;2 < 30 (1) &ngr;4 < 30 (2) |
