# US 4,400,707 A · Recording medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,400,707 A - Document ID: US4400707A - Status: Granted - Kind: A - Application number: 06/290,654 - Filed: 1981-08-06 - Granted: 1983-08-23 - Earliest claimed: 1980-08-20 - Assignees: Hitachi, Ltd. - Inventors: Munehisa Mitsuya; Motoyasu Terao; Sakae Ota; Yoshio Taniguchi; Toshimitsu Kaku; Shinkichi Horigome - Web page: https://patentgrep.com/patent/US4400707A ## CPC - B41M 5/24: Ablative recording, e.g. by burning marks; Spark recording {(marking by high energetic means, e.g. by laser otherwise than burning or ablative removal B41M5/26; materials or methods for recording or reproduction by optical means G11B7/00)} - G11B 7/2575: resins - B41M 5/42: Intermediate, {backcoat}, or covering layers {(B41M5/405 takes precedence; multilayer thermal transfer systems in general B41M5/38214)} - G11B 7/244: comprising organic materials only - G11B 7/252: of layers other than recording layers - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A recording medium in which a substrate, an inorganic material layer adapted to absorb light and generate heat, a first organic material layer made of an organic matter containing metal, and a second organic material layer adapted to be deformed or removed by heat are successively stacked. A metal salt of an organic acid, or organic metal compound etc. are employed for the first organic material layer. Owing to the presence of this layer, the recording medium exhibits a stability against changes in the ambient temperature. ## Claims ### Claim 1 A recording medium comprising a substrate, an inorganic material layer which is formed on said substrate and which absorbs light and generates heat, a first organic material layer which is formed on said inorganic material layer and which is made of at least one metal-containing organic compound, and a second organic material layer which is formed on said first organic material layer and which is deformed or removed by heat. ### Claim 2 (depends on 1) A recording medium according to claim 1, wherein said first organic material layer is made of at least one organic material selected from the group consisting of a metal salt of an organic acid, an alkoxide, and an organic metal compound. ### Claim 3 (depends on 1) A recording medium according to claim 1, wherein said metal salt of said organic acid is at least one metal salt selected from the group consisting of metal salts of carboxylic acids, metal salts of sulfonic acids, metal salts of sulfinic acids, metal salts of phenol, metal salts of enol, and metal salts of thiophenol. ### Claim 4 (depends on 3) A recording medium according to claim 3, wherein a metal of said at least one metal salt is at least one metal selected from the group consisting of Li, Na, K, Rb, Cs, Cu, Ag, Au, Be, Mg, Ca, Sr, Ba, Zn, Cd, Hg, B, Al, Ga, Ge, Sn, Pb, Co, Fe, Ni, Cr, Ti and Mn. ### Claim 5 (depends on 1, 2, 3, 4) A recording medium according to any of claims 1 to 4, wherein said first organic material layer is made of an organic material whose melting point or softening point lies in a range of 60.degree.-400.degree. C. ### Claim 6 (depends on 1, 2, 3, 4) A recording medium according to any of claims 1 to 4, wherein said first organic material layer has a thickness lying in a range of 1-50 nm. ### Claim 7 (depends on 1) A recording medium according to claim 1, wherein said inorganic material layer is made of an inorganic material which is represented by a general formula of A.sub.x B.sub.y (where letter A denotes at least one element selected from the group consisting of In, Bi, Te, Sb, Pb, Ge and Sn, letter B denotes at least one element selected from the group consisting of S, Se and O, letter x indicates a value in a range of 65.ltoreq.x.ltoreq.100 in terms of atomic percent, and letter y indicates a value in a range of 0.ltoreq.y.ltoreq.35 in terms of atomic percent). ### Claim 8 (depends on 7) A recording medium according to claim 7, wherein a thickness of said inorganic material layer lies in a range of 20-300 nm. ### Claim 9 (depends on 1, 2, 3, 4, 7, 8) A recording medium according to claim 1, 2, 3, 4, 7 or 8, wherein said second organic material layer is made of an organic material whose melting point or softening point lies in a range of 60.degree.-200.degree. C. ### Claim 10 (depends on 9) A recording medium according to claim 9, wherein said second organic material layer is made of at least one material selected from the group consisting of hydrocarbon, a halogen derivative of hydrocarbon, alcohol, ester, aldehyde, ketone, a nitro compound, a nitroso compound, an amino compound, carboxylic acid, a spiro compound, a heterocyclic compound, a natural resin, and a synthetic resin. ### Claim 11 (depends on 9) A recording medium according to claim 9, wherein said second organic material layer has a thickness lying in a range of 20-200 nm. ### Claim 12 (depends on 7, 8) A recording medium according to claim 7 or 8, wherein a second inorganic material layer is further formed between said inorganic material layer and said first organic material layer, said second inorganic material layer being made of a material which is represented by a general formula of D.sub.s E.sub.t (where letter D denotes at least one element selected from the group consisting of In, Bi, Te, Sb, Pb, Ge and Sn, letter E denotes at least one element selected from the group consisting of S, Se and O, letter s indicates a value in a range of 25.ltoreq.s.ltoreq.60 in terms of atomic percent, and letter t indicates a value in a range of 40.ltoreq.t.ltoreq.75 in terms of atomic percent). ### Claim 13 (depends on 12) A recording medium according to claim 12, wherein said second inorganic material layer has a thickness lying in a range of 10-300 nm. ### Claim 14 (depends on 1, 2, 3, 4, 7, 8) A recording medium according to claim 1, 2, 3, 4, 7 or 8, wherein a third organic material layer is further formed on said second organic material layer, said third organic material layer being made of an organic material which has a melting point or softening point higher than a melting point or softening point of the material forming said second organic material layer. ### Claim 15 (depends on 14) A recording medium according to claim 14, wherein said third organic material layer has a thickness lying in a range of at least 1 nm and not exceeding a thickness of said second organic material layer. ### Claim 16 (depends on 2) A recording medium according to claim 2, wherein said first organic material layer is made of at least one alkoxide, and wherein said alkoxide is selected from the group consisting of aluminumalkoxide and calciumalkoxide. ### Claim 17 (depends on 2) A recording medium according to claim 2, wherein said first organic material layer is made of at least one organic metal compound, and wherein said organic metal compound is selected from the group consisting of bisbenzenechromium and alkyltitanium compounds. ### Claim 18 (depends on 2) A recording medium according to claim 2, wherein said first organic material layer is made of at least one metal salt of an organic acid. ### Claim 19 (depends on 3, 4) A recording medium according to claim 3 or 4, wherein the organic acid of said at least one metal salt of an organic acid is selected from the group consisting or capric acid, lauric acid, palmitic acid, stearic acid, phthalic acid, methanesulfonic acid, benzenesulfonic acid, p-toluenesulfonic acid, 1-naphthalenesulfonic acid, benzenesulfinic acid, p-toluenesulfinic acid, phenol and thiophenol. ### Claim 20 (depends on 10) A recording medium according to claim 10, wherein said second organic material layer is made of at least one material selected from the group consisting of octacosane, dotriacontane, hexatriacontane, hexaethylbenzene, melissylchloride, 1,2-diiodoethylene, cerotyl alcohol, tripropynylcarbinol, melissic acid methylester, metapropionaldehyde, palmitone, stearone, .beta.-phenylbutyrophenone, 2,2-dinitro-3,3-propanediol, dodecamethylenediamine, stearic acid, behenic acid, sorbic acid, cyclobutane-1,1-dicarboxylic acid, benzoic acid, anthrone-9-spiro-1'-cyclopropane, furan derivatives, carbazoles, natural rubber, cellulose and derivatives thereof, polyethylene, ethylene-vinylacetate copolymer, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl acetal, fluorocarbon plastics, acrylic resin, polyacrylonitrile, polystyrene, polyacetal resin and styrene-acrylonitrile copolymer.