Patent ID: 9383487
Filing Date: 2016-07-05
CPC Classification: G02B

Claim Text:
1. A laminated diffractive optical element comprising: a first layer having a diffraction grating surface; and a second layer disposed on the diffraction grating surface of the first layer, wherein one of the first layer and the second layer comprises an organic-inorganic composite containing a resin and metal oxide, and wherein the other one of the first layer and the second layer comprises a colorant selected from the group consisting of dyes and pigments, wherein the metal oxide is selected from the group consisting of 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 layer comprising the colorant has high refractive index and low dispersion characteristics as compared with the one of the first layer and the second layer comprising an organic-inorganic composite containing a resin and metal oxide.