Ricoh Company, Ltd.

Hideaki Oba

Michiharu Abe

Masaakira Umehara

Tsutomu Sato

Yutaka Ueda

Tetsu Yamamuro

Makoto Kunikane

Kiyoshi Tanikawa

Seiko Kobayashi

Hitoshi Funakoshi

This invention relate to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of compounds expressed by the general formula (I), (II), (III) and (IV): ##STR1## (wherein in the above formulas, A, B, D and E represent a substituted or non-substituted aryl group; R.sub.1 to R.sub.8 may be the same or different and represent hydrogen atom, halogen atom or alkyl group; Y represents a divalent residue having atomic groups necessary for forming a five-membered ring or six-membered ring; m, n and l represents 0, 1 or 2; ans X.sup.- represents an acid anion); ##STR2## (wherein in the above formulas, A' represents a heterocyclic ring selected from the group of thiazole, oxazole, pyrrole, 3,3-dialkyl indolenine, imidazole, pyridine and quinoline and said heterocyclic ring may be condensed with a benzen ring or naphthalene ring, the aromatic ring of which may have a substituent; D' and E' may be the same or different and represent a substituted or non-substituted aromatic ring or D' and E' may get together to form an aromatic ring or heterocyclic ring; X represents an anion; l represents 0, 1 or 2 and m and n represnt 0, 1, 2 or 3; R.sub.9 represents hydrogen, alkyl group, amino group or halogen atom; and Y represents atomic groups necessary for forming a substituted or non-substituted five-membered ring or six-membered ring).

Optical information recording element

This invention provides an optical information recording medium that has, on a substrate, a recording layer containing a cyanine dye represented by the general formula: ##STR1## (wherein, R.sub.1, R.sub.2 and R.sub.3 may be the same or different and each stands for a substituted or unsubstituted alkyl group; X stands for a perhalogenate ion, a toluenesulfonate ion or an alkylsulfate ion; n stands for an integrer of 0 or 1-3; a first halogen atom is present in at least one of each 4, 6 and 7-positions of the indole and indolenine rings; a second halogen atom may be present in each 5-position of said rings; and at lest one group consisting of alkyl, alkoxy, hydroxy, carboxy, allyl and alkylcarbonyl may be present in at least one of each 4, 5, 6 and 7-positions of said rings.) and, if necessary, a transition metal complex or a salt of said complex with a cation.

Optical information recording medium

This invention relates to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of triaryl methane type coloring matters expressed by the general formula (1), (2) or (3): ##STR1## (wherein, in the above formulas (1) and (2), Ar.sub.1, Ar.sub.2 and Ar.sub.3 may be the same or different and represent a substituted or non-substituted arylene group, at least one pair of optical two nitrogen atoms bonded with said arylene groups being connected by an atomic chain having at least ten carbon atoms in total number in the shortest way; R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.7 may be the same or different and represent hydrogen atom, aliphatic hydrocarbon group, cycloaliphatic hydrocarbon group, aromatic hydrocarbon group, halogen group, oxygen-containing characteristic group, ether group, carboxylic acid group, carboxylic acid ester group, acyl group, oxygen-containing complex group, sulfur-containing characteristic group, one nitrogen atom-containing characteristic group, two nitrogen atom-containing characteristic group or heterocyclic group; and X.sup.- represents and acid anion); or ##STR2## (wherein in the above general formula (3), Ar.sub.4, Ar.sub.5 and Ar.sub.6 may be the same or different and represent a substituted or non-substituted aryl group; and X.sup.- represents an acid anion; provided that at least one of said three aryl groups is a group expressed by the general formula, ##STR3## wherein Z represents ##STR4## R.sub.8, R.sub.9, R.sub.10 and R.sub.11 may be the same or different and represent hydrogen atom, aliphatic hydrocarbon group, cycloaliphatic hydrocarbon group, aromatic hydrocarbon group, halogen group, oxygen-containing characteristic group, ether group, carboxylic acid group, carboxylic acid ester group, acyl group, oxygen-containing complex group, sulfur-containing characteristic group, one nitrogen atom-containing characteristic group, two nitrogen atom-containing characteristic group or heterocyclic group; 1 represents 0 or an integer of 1 to 3; and m represents 0 or an integer of 1 to 4).

The present invention relates to an optical information recording medium comprising a substrate, recording layer and protective layer, characterized in that said protective layer comprises, as the main components, a high molecular compound and at least one of record-promoting agents selected from the group of (a) explosive material, (b) plasticizer, (c) organic low molecular compound having a melting point not higher than 140.degree. C., and (d) light-absorbing material.

The present invention relates to an optical information recording medium comprising a recording layer applied directly on a substrate or applied on a substrate by intervening an underlayer therebetween, and further comprising a protective layer on said recording layer if necessary, characterized in that said recording layer contains at least one of the compounds expressed by the following general formula (I) or (II): ##STR1## (wherein in the above formulas, X.sub.1 to X.sub.3 represent O, S or Se; A.sup.- represents an anion; l, m or n represents 0 or 1; R.sub.4 represents a substituted or non-substituted aryl group or heterocyclic group; R.sub.3, R.sub.5, R.sub.6, R.sub.9, R.sub.10 and R.sub.11 represent hydrogen or an alkyl group; R.sub.1, R.sub.2, R.sub.7, R.sub.8, R.sub.12, and R.sub.13 represent hydrogen or a substituted or non-substituted alkyl, aryl or styryl group; Z.sub.1, Z.sub.3 and Z.sub.5 represent atomic groups necessary for forming a substituted or non-substituted pyrylium, thiapyrylium, selenapyrylium, benzopyrylium, benzothiapyrylium, benzoselenapyrylium, naphthopyrylium, naphthothiapyrylium or naphthoselenapyrylium; Z.sub.2 and Z.sub.4 represent atomic groups necessary for forming a substituted or non-substituted five-membered ring or six-membered ring; and said five-membered ring and six-membered ring may be condensed with an aromatic ring).

This invention relates to an optical information recording medium, characterized in that on a substrate there is applied a coloring matter film chemically inert to said substrate, said coloring matter film having an extinction coefficient of at least 1.

This invention relates to an optical information recording medium having an organic thin film recording layer, and optionally having an underlayer and/or protective layer, characterized in that at least one of said recording layer, underlayer and protective layer contains a compound expressed by the general formula (1), ##STR1## wherein R represents hydrogen or a lower alkyl group; X represents acid anion; m represents 0, 1 or 2; and A represents ##STR2## (n being 1 or 2) or ##STR3## (when m is 2); all the aromatic rings optionally having a substituent selected from the group of a lower alkyl group, lower alkoxy group, halogen and hydroxyl group.

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.

An optical information recording medium being capable of writing and reading with laser beam which comprises forming, on a transparent or opaque substrate, a thin film (recording layer) containing a cyanine coloring matter represented by the general formula: ##STR1## (wherein, R.sup.1, R.sup.2 and R.sup.3 may be the same or different, and each stands for C.sub.1 -C.sub.6 alkyl; X stands for halogen, perhalogenate, boron tetrafluoride, toluenesulfonic acid or alkylsulfonic acid; A stands for a benzene ring or a naphthyl ring and a substituent such as alkyl, alkoxy, hydroxy, carboxyl, halogen, allyl or alkylcarboxyl may be or may be not present on each ring; and n is an integer of 1-3.).

An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer comprising a reflective layer in which metal particles with a particle diameter of 1500.ANG. or less have been distributed closely and a light absorptive layer in which metal compounds and a very small amount of metal particles with a particle diameter of 200-2000.ANG. have been dispersed unformly or substantially uniformly in the volume ratio of 1-30% in a resin.

An optical information recording medium comprising a substrate and a recording layer superimposed on said substrate, said recording layer being comprised of a reflective layer which contains metal particles having a particle diameter of 1500 .ANG. or less and in which said metal particles have been distributed closely and a light absorptive layer containing a coloring matter.

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Yokohama, Japan

Hideaki Oba