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US 8,431,207 B2Granted
Optical recording material, optical recording medium, and recording and reproducing method of optical recording medium
AssigneeRicoh Company, Ltd.
InventorsTohru Yashiro, Fumiya Ohmi, Satoshi Mizukami, Yuki Nakamura, Masahiro Hayashi, Ippei Matsumoto
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Abstract
The present invention provides an optical recording material allows for obtaining excellent recording signal properties even at high-speed recording and is excellent in durability in both a single-sided single layer optical recording medium and a single-sided two-layer optical recording medium having a first recording layer and a second recording layer. The optical recording material contains a cyanine compound having a specific structure and a squarylium compound as dyes for optical recording layers.
Claims13
An optical recording material, comprising:
- a cyanine compound represented by general formula (A),
- where Ra, Rb, Rc and Rd represent independently a hydrogen atom, an alkyl group that may have a substituent group, an aryl group that may have a substituent group or an aralkyl group that may have a substituent group, and
- a squarylium compound represented by general formula (I),
- where R1 and R2 may be the same to each other or different from each other and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group or a heterocyclic group that may have a substituent group;
- “Q” represents a metal atom having a coordinating ability;
- “q” is an integer of 2 or 3;
- R3 and R4 may be the same to each other or different front each other, and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, or an aryl group that may have a substituent group, and R3 and R4 may be bound to each other to form an alicyclic hydrocarbon ring or a heterocyclic ring;
- R5 represents a hydrogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group or an aryl group that may have a substituent group;
- R6 represents halogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group, a nitro group, a cyano group or an alkoxy group that may have a substituent group;
- “p” is an integer of 0 to 4;
- here, when “p” is an integer of 2 to 4, each R6 may be the same to each other or different from each other, and further two adjacent R6s may be bound to two adjacent carbon atoms to form an aromatic ring that may have a substituent group.
8 more elements
An optical recording medium, comprising:
- a substrate, and
- an optical recording material formed on the substrate,
- wherein the optical recording material comprises a cyanine compound represented by general formula (A),
- where Ra, Rb, Rc and Rd represent independently a hydrogen atom, an alkyl group that may have a substituent group, an aryl group that may have a substituent group or an aralkyl group that may have a substituent group, and
- a squarylium compound represented by general formula (I),
- where R1 and R2 may be the same to each other or different from each other and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group or a heterocyclic group that may have a substituent group;
- “Q” represents a metal atom having a coordinating ability;
- “q” is an integer of 2 or 3;
- R3 and R4 may be the same to each other or different from each other, and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, or an aryl group that may have a substituent group, and R3 and R4 may be bound to each other to form an alicyclic hydrocarbon ring or a heterocyclic ring;
- R5 represents a hydrogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group or an aryl group that may have a substituent group;
- R6 represents a halogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group, a nitro group, a cyano group or an alkoxy group that may have a substituent group;
- “p” is an integer of 0 to 4;
- here, when “p” is an integer of 2 to 4, each R6 may be the same to each other or different from each other, and further two adjacent R6s may be bound to two adjacent carbon atoms to form an aromatic ring that may have a substituent group.
10 more elements
A method for recording and reproducing an optical recording medium, comprising:
- performing any one of recording or reproducing of signal information by irradiating an optical recording medium with a laser beam having a recording wavelength of 580 nm to 720 nm from a substrate surface side thereof,
- wherein the optical recording medium comprises a substrate, and an optical recording material formed on the substrate,
- wherein the optical recording material comprises
- a cyanine compound represented by general formula (A),
- where Ra, Rb, Rc and Rd represent independently a hydrogen atom, an alkyl group that may have a substituent group, an aryl group that may have a substituent group or an aralkyl group that may have substituent group, and
- a squarylium compound represented by general formula (I),
- where R1 and R2 may be the same to each other or different from each other and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group or a heterocyclic group that may have a substituent group;
- “Q” represents a metal atom having a coordinating ability;
- “q” is an integer of 2 or 3;
- R3 and R4 may be the same to each other or different from each other, and respectively represent an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, or an aryl group that may have a substituent group, and R3 and R4 may be bound to each other to form an alicyclic hydrocarbon ring or a heterocyclic ring;
- R5 represents a hydrogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group or an aryl group that may have a substituent group;
- R6 represents a halogen atom, an alkyl group that may have a substituent group, an aralkyl group that may have a substituent group, an aryl group that may have a substituent group, a nitro group, a cyano group or an alkoxy group that may have a substituent group;
- “p” is an integer of 0 to 4;
- here, when “p” is an integer of 2 to 4, each R6 may be the same to each other or different from each other, and further two adjacent R6s may be bound to two adjacent carbon atoms to form an aromatic ring that may have a substituent group.
11 more elements
Dependencies are inferred from the claim text.