Patent ID: 9625682
Date: 2017-04-18
CPC Classifications: G02B

Claim:
1. An imaging lens comprising: a first lens having positive refractive power; a second lens having negative refractive power; a third lens having refractive power; a fourth lens having refractive power; and a fifth lens having refractive power, arranged in this order from an object side to an image plane side, wherein said first lens is formed in a shape so that a curvature radius of a surface thereof on the object side is positive, said third lens is formed in a shape so that a curvature radius of a surface thereof on the object side is positive, said fourth lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side are aspheric, said fifth lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side are aspheric, said fifth lens is formed in the shape so that a curvature radius of the surface thereof on the image plane side is positive near an optical axis thereof, and said fourth lens has an Abbe's number νd