Patent ID: 8068291

Claim:
An imaging lens comprising: two lens blocks each including a lens substrate that is a parallel plate, and a lens contiguous with at least one of object-side and image-side substrate surfaces of the lens substrate, the lens exerting a positive or negative optical power; and wherein, in each of said two lens blocks, said lens included therein is formed of a material different from a material of which said lens substrate is formed; wherein said two lens blocks comprise a first lens block disposed at a most object-side position, the first lens block exerting a positive optical power and including, as said lens substrate, a first lens substrate, and as said lens, a lens L[LS 1 o ] contiguous with an object-side substrate surface of the first lens substrate, wherein an object-side lens surface of the lens L[LS 1 o ] is convex to an object side, wherein conditional formula (C2) below is fulfilled: 0.6≦ f[L[LS 1 o]o]/f[all]≦ 2.0 (C2) where f[L[LS 1 o]o] represents a focal length of the object-side lens surface of the lens L[LS 1 o ]; and f[all] represents a focal length of the entire imaging lens, and wherein the second lens block is located to an image side of the first lens block and includes, as said lens substrate, a second lens substrate and, as said lens, a lens L[LS 2 o ] contiguous with an object-side substrate surface of the second lens substrate and a lens L[LS 2 m ] contiguous with an image-side substrate surface of the second lens substrate, an object-side lens surface of the lens surface of the lens L[LS 2 o ] being concave to an object side, an image-side lens surface of the lens L[LS 2 m ] being aspherical.