Patent ID: 7696291
Filing Date: 2010-04-13
Classification: C08F,G02B

Abstract:
1. A chromatic aberration-free lens system comprising a combination of (1) a lens wherein nd>1.6, and vd<40, where nd represents a refractive index, and vd represents an Abbe number, and (2) a chromatic aberration-free lens, made of an amorphous fluoropolymer comprising a carbon atom chain as a main chain and comprising a fluorinated atom-bonded carbon atom as a carbon atom of the main chain, wherein vd>75, θgF>0.50, and ΔθgF>0.03, where vd represents an Abbe number, θgF represents a relative partial dispersion of a g-F line, and ΔθgF represents a deviation from a standard line of the relative partial dispersion of the g-F line.