Patent ID: 7777964

Claim:
A plastic rod lens having a cylindrical shape with a radius R comprising: a central axis; and an outer peripheral portion, wherein a refractive index n D decreases from the central axis to the outer peripheral portion, and the following requirements (1) to (3) are met: 43≦ν 1 ≦60 (1) |{ n A ×ν A /( n A −1)}−{ n B ×ν B /( n B −1)}|<5 (2) n 0 −n 1 ≧0.01 (3) wherein n 1 , n 0 , n A , and n B represent the refractive index n D in the outer peripheral portion, at the center, and at arbitrary points A and B, respectively, and ν 1 , ν A , and ν B represent Abbe number v in the outer peripheral portion, and at the arbitrary points A and B, respectively, wherein a polymer constituting the plastic rod lens contains the following building blocks (A) to (C): (A) a (meth)acrylate unit containing an alicyclic ring and/or a heterocyclic ring, (B) a monomer unit containing an aromatic ring, and (C) a fluorinated alkyl(meth)acrylate unit, and wherein a content of the building block (B) in the polymer increases continuously towards the outer peripheral portion at least within a distance range of 0.8 R to R from the central axis.