IMAGING LENS AND IMAGING APPARATUS

摘要

An imaging lens substantially consists of six lenses, composed of a negative first lens, a positive second lens, a negative third lens, a positive fourth lens, a positive fifth lens, and a negative sixth lens, disposed in order from the object side, and satisfies, when the distance between the first lens and the second lens is taken as Db12, the center thickness of the second lens is taken as D3, the focal length of the second lens is taken as f2, the focal length of the entire system is taken as f, the paraxial radius of curvature of the object side surface of the first lens is taken as R1f, and the paraxial radius of curvature of the image side surface of the first lens is taken as R1r, conditional expressions given below:;1.0<(Db12+D3)/f   (1);f2/f<1.68   (2);1.1<(R1f+R1r)/(R1f−R1r)<2.2   (3-3)

主权项

1. An imaging lens, substantially consisting of six lenses, composed of a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power, disposed in order from the object side, wherein the imaging lens satisfies conditional expressions given below:
1.0<(Db12+D3)/f   (1) f2/f<1.68   (2) 1.1<(R1f+R1r)/(R1f−R1r)<2.2   (3-3)where
Db12: air space on the optical axis between the first lens and the second lens, D3: center thickness of the second lens, f2: focal length of the second lens, f: focal length of the entire system, R1f: paraxial radius of curvature of the object side surface of the first lens, and R1r: paraxial radius of curvature of the image side surface of the first lens.