Polymeric photo-chromic composition
AssigneeOMD Devices LLC
InventorsVladimir Arsenov, Jacob N. Malkin
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Abstract
The present invention relates to the field of photo-chromic materials, in particular, to photo-chromic compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for computers, multimedia applications and the like. In particular, nonfluorescent spiropyrane is transformed into fluorescent merocyanine by electromagnetic radiation.
Claims7
A method of recording of information within a 3-D memory system comprising a matrix carrying an active photo-chromic medium material, said method comprising illuminating of said matrix by a first electromagnetic radiation so as to induce within said medium material a photo-chemical reaction being associated with recording of said information, wherein during said reaction a first form A of said medium material, which is not fluorescent upon illuminating thereof by said first radiation is transformed into a second form B of said medium material, which is fluorescent upon illuminating thereof by a second electromagnetic radiation, said first and said second electromagnetic radiation having different wavelengths characterized in that said photo-chemical reaction is transformation of a non fluorescent spiropyrane into fluorescent merocyanine form thereof according to the following equation:
- ##STR2##
A 3D memory system, comprising an active medium material capable to exist in a first non-fluorescent form A thereof, said first form being photo-chemically convertible into a second form B thereof, said second form exhibiting induced fluorescence upon irradiating thereof by electromagnetic radiation, characterized in that said medium material comprises at least one polyester of 2,2'-bis-(4-oxyphenylpropane), pimelinic acid and .alpha., .alpha.'-bis-(6-nitro-8-oxymethyl-3', 3-dimethylspiro(2H-1-benzopyran-2,2-indoline)-1-il)-p-xylene having general formula V below. ##STR5##
Dependencies are inferred from the claim text.