Imaging lens

摘要

An image lens is disclosed. The image lens includes, arranged in succession from the object side to the image side, an aperture stop S1, a first lens L1 having two convex surfaces and having a positive refractive power, a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power, and a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power.

主权项

1. An image lens comprising, arranged in succession from the object side to the image side:
an aperture stop S1; a first lens L1 having two convex surfaces and having a positive refractive power; a second lens L2 having a meniscus shape convex toward the object side and having a negative refractive power; a third lens L3 having a meniscus shape convex toward the object side and having a positive refractive power; a fourth lens L4 having a meniscus shape convex toward the image side and having a positive refractive power; a fifth lens L5 having a meniscus shape convex toward the object side and having a negative refractive power; wherein the following conditions (1)˜(4) are satisfied:
0.600≦f1/f≦0.900   (1)−1.400≦f2/f≦−1.150   (2)−0.085≦R1/R2≦−0.055   (3)3.000≦R3/R4≦6.000   (4) where, f is the focal length of the image lens LA; f1 is the focal length of the first lens L1; f2 is the focal length of the second lens L2; R1 is the curvature radius of the object side surface of the first lens L1; R2 is the curvature radius of the image side surface of the first lens L1; R3 is the curvature radius of the object side surface of the second lens L2; R4 is the curvature radius of the image side surface of the second lens L2.