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US 7,682,679 B2Granted
Optical information recording medium and method of manufacturing the same
AssigneeTaiyo Yuden Co., Ltd.
InventorsHironobu Shimizu, Daisuke Morishita
Life of this patent
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Abstract
A dye or dyes are selected, which are capable of absorbing a laser beam with a wavelength of 350 to 500 nm and are capable of recording sub-information using a laser beam with a wavelength of 640 to 680 nm or 750 to 830 nm. An optical information recording medium including the optical recording layer records sub-information (BCA information) of a type different from that of main information (data information) in a sub-information region (a BCA recording region) different from a main information area (a data area) using a laser beam.
Claims3
An optical information recording medium, comprising:
- a substrate having translucency;
- an optical recording layer comprising a light-absorbing material formed of a dye that absorbs a laser beam;
- and
- a light reflection layer reflecting the laser beam,
- wherein the optical information recording medium has (i) a main information area for recording main information that is optically readable by irradiating the laser beam on the optical recording layer, and (ii) a sub-information area separated from the main information area for recording sub-information of a type different from that of the main information by irradiating the laser beam on the optical recording layer,
- said light-absorbing material in the optical recording layer having absorption peaks at a wavelength of 350 to 500 nm and at a wavelength of 640 to 680 nm and/or 750 to 830 nm, wherein the light-absorbing material comprises an oxacyanine dye of chemical formula 2 and an azo dye of chemical formula 3:
- wherein Z1 and Z2 each represent a group of atoms necessary for forming a five or six-membered aromatic ring and nitrogen-containing heterocyclic ring, which may include a substituent;
- R represents a hydrogen atom, halogen, or aliphatic group, an aromatic group, or a heterocyclic ring group;
- R10 and R11 each represent any one of methyl group, ethyl group, propyl group, butyl group, pentyl group, and hexyl group, respectively;
- X represents an ion necessary for neutralizing electrical charges in a molecule;
- n1 and n2 each represent numbers of alkyl chains, which are represented by an integer of 1 to 20,
- wherein ring A represents a heterocyclic ring formed together with a carbon atom and a nitrogen atom to which the ring A is bonded;
- Ring B represents an aromatic ring that may be substituted or condensed;
- X represents a group that can contain active hydrogen which is a metal complex obtained by one molecule of a divalent positive metal ion (M2+) to two molecules of this azo dye.
11 more elements
An optical information recording medium, comprising:
- a substrate having translucency;
- an optical recording layer comprising a light-absorbing material formed of a dye that absorbs a laser beam;
- and
- a light reflection layer reflecting the laser beam,
- wherein the optical information recording medium has (i) a main information area for recording main information that is optically readable by irradiating the laser beam on the optical recording layer, and (ii) a sub-information area separated from the main information area for recording sub-information of a type different from that of the main information by irradiating the laser beam on the optical recording layer,
- said light-absorbing material in the optical recording layer having absorption peaks at a wavelength of 350 to 500 nm and at a wavelength of 640 to 680 nm or 750 to 830 nm,
- wherein the light-absorbing material comprises an oxacyanine dye of chemical formula 4 and a cyanine dye of chemical formula 5:
- wherein Z1 and Z2 each represent a group of atoms necessary for forming a five or six-membered aromatic ring and nitrogen-containing heterocyclic ring, which may include a substituent;
- R represents a hydrogen atom, halogen, or aliphatic group, an aromatic group, or a heterocyclic ring group;
- R10 and R11 each represent any one of methyl group, ethyl group, propyl group, butyl group, pentyl group, and hexyl group, respectively;
- X represents an ion necessary for neutralizing electrical charges in a molecule;
- n1 and n2 each represent numbers of alkyl chains, which are represented by an integer of 1 to 20,
- wherein n represents an integer of 1 or 2;
- A1 and A2 each represent a benzene ring having a phenyl-ethylene group as a substituent;
- R1 and R2 each represent alkyl group or an alkali metal ion or an alkyl sulfonic acid group bonded with alkyl group;
- X− represents a negative ion of an halogen atom, perchloric acid, boron hydrofluoric acid, or toluenesulfonic acid, proviso that when R1 and R2 have groups bonded with alkali metal ions, X− does not have to be present.
13 more elements
An optical information recording medium, comprising:
- a substrate having translucency;
- an optical recording layer comprising a light-absorbing material formed of a dye that absorbs a laser beam;
- and
- a light reflection layer reflecting the laser beam,
- wherein the optical information recording medium has (i) a main information area for recording main information that is optically readable by irradiating the laser beam on the optical recording layer, and (ii) a sub-information area separated from the main information area for recording sub-information of a type different from that of the main information by irradiating the laser beam on the optical recording layer,
- said light-absorbing material in the optical recording layer having absorption peaks at a wavelength of 350 to 500 nm and at a wavelength of 640 to 680 nm or 750 to 830 nm,
- wherein the light-absorbing material contains an oxacyanine dye of chemical formula 6 and a phthalocyanine dye of chemical formula 7:
- wherein Z1 and Z2 each represent a group of atoms necessary for forming a five or six-membered aromatic ring and nitrogen-containing heterocyclic ring, which may include a substituent;
- R represents a hydrogen atom, halogen, or aliphatic group, an aromatic group, or a heterocyclic ring group;
- R10 and R11 each represent any one of methyl group, ethyl group, propyl group, butyl group, pentyl group, and hexyl group;
- X represents an ion necessary for neutralizing electrical charges in a molecule;
- n1 and n2 each represent numbers of alkyl chains, which are represented by an integer of 1 to 20,
- wherein M represents Cu, Pd, or Co, and A1, A2, A3, and A4 each represent substituents.
10 more elements
Dependencies are inferred from the claim text.