Patent ID: 8270098

Claim:
An image pickup lens comprising: at least three lens blocks each comprising a lens substrate being a parallel flat plate, and a lens or lenses, having a positive or negative power, being connected to at least one of an object-side surface and an image-side surface of the lens substrate, wherein the lens or lenses included in each of the lens blocks, is formed of a different material from the lens substrate, a first lens block which is one of the lens blocks arranged at a closest position to an object side, has a positive power, a second lens block which is another of the lens blocks arranged at an image side of the first lens block has a negative power, and the image pickup lens satisfies the following expression (G1): 0.7 <f[BK 1 ]/f [all]<1.0 (G1) where f[BK 1 ] is a composite focal length of the first lens block, and f[all] is a composite focal length of a total system of the image pickup lens.