Patent ID: 9091837
Filing Date: 2015-07-28
Classification: G02B

Abstract:
1. An imaging lens comprising: a first lens having positive refractive power; a second lens having negative refractive power; a third lens; a fourth lens; a fifth lens; and a sixth lens, arranged in this order from an object side to an image plane side, wherein 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 have negative curvature radii, said sixth lens is formed in a shape so that a surface thereof on the object side and a surface thereof on the image plane side have positive curvature radii, and said fourth lens has an Abbe's number νd4, said fifth lens has an Abbe's number νd5, and said sixth lens has an Abbe's number νd6 so that the following conditional expressions are satisfied: