Patent ID: 8081358
Filing Date: 2011-12-20
Classification: B42D,G03H

Abstract:
1. A laser marking hologram comprising a volume hologram layer including interference fringes recorded therein, wherein said volume hologram layer includes at least one of information of character, numerical character, picture pattern, biometric matter recorded therein, said volume hologram layer further having a contrast between an irradiated portion and a non-irradiated portion thereof provided by selectively irradiating laser light to said volume hologram layer, said volume hologram layer formed from a resin composition, the resin composition including a radical photo-polymerizable compound, a cationic photo-polymerizable compound, and a photopolymerization initiator, wherein: a refractive index of the radical photo-polymerizable compound is greater than a refractive index of the cationic photo-polymerizable compound, said resin composition further including photochromic compounds, and the photochromic compounds are selected from the group consisting of chromene based compounds, spirooxazine based compounds, spirogyran based compounds, fulgide based compounds, and azobenzene based compounds.