Optical information recording medium
AssigneeRicoh Company, Ltd.
InventorsMichiharu Abe, Hideaki Oba
Life of this patent
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Abstract
An optical information recording medium which comprises the provision of a thin film (recording layer) formed of a cyanine coloring matter and a transition metal complex being superior in long wavelength range light absorbability to said coloring matter on a transparent or opaque substrate and which permits writing and reading by using laser beam.
Claims107
An optical information recording medium, comprising a substrate and a recording layer on said substrate, said recording medium being free of a reflective metal layer, said recording layer being a monolayer made of a mixture consisting essentially of cyanine coloring matter and a transition metal complex, said transition metal complex being superior in absorbability of long wavelength range light in comparison to said cyanine coloring matter, said recording layer having a thickness of from 100 to 1000 Angstrom units, said recording layer containing from 1 to 80 parts by weight of said transition metal complex per 100 parts by weight of said cyanine coloring matter.
An optical information recording medium comprising a substrate and a recording layer on said substrate, said recording medium being free of a reflective metal layer, said recording layer being a monolayer mode of a mixture consisting essentially of cyanine coloring matter and a transition metal complex, said transition metal complex being superior in absorbability of long wavelength range light in comparison to said coloring matter, and in which said cyanine coloring matter has the formula ##STR38## wherein R.sup.3, R.sup.4 and R.sup.5 can be the same or different and each is C.sub.1 -C.sub.6 alkyl;
- X is halogen, perhalogenate, boron tetrafluoride, toluenesulfonic acid or alkylsulfonic acid;
- E is a benzene ring, a naphthylene ring, or said rings substituted with alkyl, alkoxy, hydroxy, carboxyl, halogen, alkyl or alkylcarboxyl;
- and l is an integer of 1 to 3, said recording layer having a thickness of from 100 to 1000 Angstrom units, said recording layer containing from 1 to 80 parts by weight of said transition metal complex per 100 parts by weight of said cyanine coloring matter.
An optical information recording medium comprising a substrate and a recording layer on said substrate, said recording medium being free of a reflective metal layer, said recording layer being a monolayer made of a mixture consisting essentially of cyanine coloring matter and a transition metal complex, said transition metal complex being superior in absorbability of long wavelength range light in comparison to said coloring matter, and wherein said cyanine coloring matter has the formula:
- ##STR42## where D is a halogen atom, said recording layer having a thickness of from 100 to 1000 Angstrom units, said recording layer containing 1 to 80 parts by weight of said transition metal complex per 100 parts by weight of said cyanine coloring matter.
Dependencies are inferred from the claim text.