Imaging lens and imaging apparatus using the same

摘要

An imaging lens formed of 4 lenses, in which a negative first lens having a meniscus shape with a convex surface on the object side, a biconvex positive second lens, a negative third lens having a concave surface on the image side, and a positive fourth lens having a convex surface on the object side, arranged in order from the object side, and the imaging lens satisfies conditional expressions (1): L12/f<0.82; (2): 2.3

主权项

1. An imaging lens substantially consisting of four lenses, wherein the imaging lens is composed of a first lens having a meniscus shape with a convex surface on the object side and a negative refractive power, a second lens having a biconvex shape and a positive refractive power, a third lens having a concave surface on the image side and a negative refractive power, and a fourth lens having a convex surface on the object side and a positive refractive power arranged in order from the object side, and satisfies conditional expressions (1), (2), (5), and (6) given below simultaneously:
L12/f<0.82  (1); 2.3 L12: the distance (air equivalent distance) between the first lens and the second lens on the optical axis; f: the focal length of the entire lens system; R2F: the radius of curvature of the object side lens surface of the second lens; f1: the focal length of the first lens; and ν1: the Abbe number of the first lens with respect to the d-line.