Patent ID: 8124324
Filing Date: 2012-02-28
Classification: B29D,C08K,G02B

Abstract:
1. A laminated diffractive optical element comprising: a first diffractive optical element that is formed from a resin composition, and in which one surface is a diffractive surface having a diffractive shape; and a second diffractive optical element that has an Abbe number higher than that of the first diffractive optical element, and in which one surface is a diffractive surface having a diffractive shape, wherein the first diffractive optical element and the second diffractive optical element are disposed in intimate contact with each other so that the diffractive surfaces thereof face each other, wherein the resin composition is a cured composition formed from: (A) at least one of a monomer and an oligomer of one or more of a fluorine system and a silicone system having a polymerizable functional group in a molecule; (B) fine metal oxide particles; and (C) a polymerization initiator, wherein the fine metal oxide particles comprise particles selected from the group consisting of zinc oxide, indium oxide, tin oxide, antimony oxide, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), zinc-doped indium oxide (IZO), aluminum-doped zinc oxide (AZO), and fluorine-doped tin oxide (FTO), and wherein the refractive index (nd) of the resin composition is 1.32≦nd<1.53, and the Abbe number (vd) of the resin composition is 14<vd≦35, and the second-order dispersion characteristic (θg, F) of the resin composition is 0.34<θg, F<0.47.