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US 5,175,079 AGranted
Optical memory device
AssigneeSharp Kabushiki Kaisha
InventorsKazuo Van, Kenji Ohta, Yoshiteru Murakami
Life of this patent
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Abstract
An optical memory device comprising: a transparent substrate; and a recording film deposited on the transparent substrate, the recording film being formed by preparing a composition in which a diarylethene-type photochromic compound is dispersed in an ultraviolet-curing polyurethaneacrylate resin of solventless type and by curing the composition by an ultraviolet ray irradiation.
Claims9
An optical memory device comprising:
- a transparent substrate;
- and
- a recording film, deposited on the transparent substrate, the recording film consisting essentially of an ultraviolet cured dispersion of a diarylethene photochromic compound in an ultraviolet curable polyurethaneacrylate resin, wherein the diarylethene photochromic compound is a compound represented by the following formula (I) or (II):
- ##STR3## wherein each of X and Y represents a sulfur atom or --NR.sub.6 and R.sub.6 is a lower alkyl;
- R.sub.1 represents a lower alkyl;
- each of R.sub.2, R.sub.3, R.sub.4 and R.sub.5 can be a lower alkyl or a combination of R.sub.2 with R.sub.3 or a combination of R.sub.4 with R.sub.5 can be phenyl.
3 more elements
Dependencies are inferred from the claim text.