Optical recording medium
AssigneePioneer Electric Corporation
InventorsMakoto Okano, Shingo Iwasaki, Toshiyuki Miyadera, Fumio Matsui
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Abstract
An optical recording medium has a substrate, a recording film of phthalocyanine coloring matter and provided on the substrate, a light reflection film on the recording film, and a protection film on the light reflection film. The light reflection film is made of Au and has a thickness less than 1500 .ANG..
Claims4
In an optical recording medium comprising a substrate, a recording film of phthalocyanine coloring matter provided on the substrate, a light reflection film on the recording film, and a protection film on the light reflection film, the improvement which comprises:
- said phthalocyanine coloring matter being represented following general formula:
- ##STR4## wherein:
- R.sub.1 is at least one member selected from the group consisting of an alkyl group and an alkyl group substituted with at least one member selected from the group consisting of a halogen atom, a hydroxyl group, --OR.sup.15, --SR.sup.15, --Se.sup.15, --Te.sup.15, ##STR5## R.sup.15 is at least one member selected from the group consisting of an alkyl group, a substituted alkyl group, an aryl group, a substituted aryl group, a cycloalkyl group, a substituted cycloalkyl group, and a polyether group;
- R.sup.16, R.sup.17, and R.sup.18 may be either the same or different and are each selected from at least one member selected from the group consisting of an alkyl group, a substituted alkyl group, a cycloalkyl group, a substituted cycloalkyl group, and aryl group, a substituted aryl group, an alkoxy group, a substituted alkoxy group, an aryloxy group, a substituted aryloxy group, a polyether group, and a hydroxyl group;
- R.sup.19 and R.sup.20 may be either the same or different and are at least one member selected from the group consisting of an alkyl group, a substituted alkyl group, a cycloalkyl group, a substituted cycloalkyl group, an aryl group, and a substituted aryl group;
- R.sub.2 is at least one member selected from the group consisting of an alkyl group, a substituted alkyl group, an alkoxy group, a substituted alkoxy group, a residue of a heterocyclic compound, a substituted residue of a heterocyclic compound, a halogen atom, a nitro group, a cyano group, and a sulfonic acid group;
- and
- Me is a metal;
- and wherein the light reflection film is Au having a thickness less than 1500 .ANG..
Dependencies are inferred from the claim text.