Imaging lens and imaging device provided with the same

摘要

An imaging lens with five lenses arranged as, in order from the object side, a first lens with a positive refractive power and a meniscus shape with a convex surface directed toward the object side, a second lens with a biconcave shape, a third lens with a negative refractive power and a meniscus shape with a convex surface toward the image side, a fourth lens with a positive refractive power, and a fifth lens with a negative refractive power, where an image-side surface of the fifth lens includes a concave surface and at least one inflection point, and a predetermined conditional expression is satisfied that achieves a high imaging performance from a central angle of view to a peripheral angle of view, while achieving reduction of an entire length of the lens.

主权项

1. An imaging lens with five lenses, consisting of, ordered as follows from an object side:
a first lens having a positive refractive power and having a meniscus shape with a convex surface toward the object side; a second lens having a biconcave shape; a third lens having a negative refractive power and having a meniscus shape with a convex surface toward an image side; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, wherein an image-side surface of the fifth lens includes a concave surface and at least one inflection point, wherein the conditional expression below is satisfied:
0.2 wherein the conditional expression below is further satisfied:
−0.6<(L1r+L2f)/(L1r−L2f)<0.11  (3),where L1r is a paraxial radius of curvature of an image-side surface of the first lens, and L2f is a paraxial radius of curvature of an object-side surface of the second lens.