Patent ID: 8902517

Claim:
An image capturing lens substantially consisting of a first lens having a negative power, a second lens having a positive power, a third lens having a negative power, a fourth lens having a positive power, and a fifth lens having a positive power, arranged in this order from the object side, wherein: the image side surface of the fifth lens has an aspherical shape with one or more inflection points and a concave shape toward the image side in a paraxial region; and the image capturing lens satisfies the following conditional expressions (1a), (2a), (3a), and (4a) simultaneously: 1.0 ≦TL/f≦ 1.8 (1a); 0.09 <Dg 2-3 /f (2a); 0.07 <|N 2 −N 3| (3a); and −35 ≦f 1 /f≦− 2.3 (4a), where: TL is an overall optical length when a distance from the image side surface of the fifth lens to the image plane is represented by an air equivalent length; f is a focal length of the entire lens system; f1 is a focal length of the first lens; Dg 2-3 is a distance (air space) between the image side surface of the second lens and the object side surface of the third lens; N2 is a refractive index of the optical member constituting the second lens; and N3 is a refractive index of the optical member constituting the third lens.