Patent ID: 7841785

Claim:
An imaging lens comprising: at least one lens block including a lens substrate that is a plane-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 said lens included in said lens block is formed of a material different from a material out of which said lens substrate is formed; wherein said lens block comprises a first lens block disposed at a most object-side position, the first lens block 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 said lens block further comprises a second lens block located to an image side of the first lens block, the second lens block including, 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, wherein an object-side lens surface of the lens L[LS 2 o] is concave to an object side, and wherein conditional formula (A1) below is fulfilled: 0 ≦DT[LS 1 o−ape]/d[LS 1]≦1 (A1) where DT[LS 1 o−ape] represents a distance from the object-side substrate surface of the first lens substrate to an aperture stop surface; and d[LS 1 ] represents a thickness of the first lens substrate along an optical axis; and Wherein conditional formula (A3) is fulfilled: 1.4< f [all] /Y ′<1.9 (A3) where f[all] represents a focal length of the entire imaging lens; and Y′ represents a maximum image height.