Patent ID: 8031415

Claim:
An imaging lens comprising: one or 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 an aperture stop restricting light amount, wherein, in each of said one or 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 one or 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, and wherein conditional formula (C1) below is fulfilled: 0.1≦| N [ LS 1]− N [L[LS1 o ]]|( C 1) where N[LS 1 ] represents an index of refraction of the first lens substrate; and N[L[LS 1 o]] represents an index of refraction of the lens L[LS 1 o].