Optical information recording method and medium
An optical information recording medium includes a substrate having disposed thereon a recording layer that is recordable by irradiating the recording layer with a laser having a wavelength of 450 nm or less. The recording layer contains a specific phthalocyanine derivative. An optical information recording method uses the medium.
1 - 12 . (canceled)
13 . A method of recording information on an optical information recording medium by irradiating the medium with a laser having a wavelength no greater than 450 nm, wherein the medium comprises a substrate having disposed thereon a recording layer on which information is recordable by irradiating the medium with laser light having a wavelength no greater than 450 nm, wherein the recording layer contains a phthalocyanine compound and has a refractive index (n) in a range of 1.5<n<1.9 and an extinction coefficient (k) in a range of 0.04<k<0.15.
14 . The method of recording information on an optical information recording medium of claim 13 , wherein the recording layer is formed by coating a coating solution on said substrate.
15 . The method of recording information on an optical information recording medium of claim 13 , wherein the recording layer contains a phthalocyanine compound represented by Formula (I):
wherein R α1 to R α8 and R β1 to R β8 each independently represents one selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a formyl group, a carboxyl group, a sulfo group, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aralkyl group having 7 to 15 carbon atoms, a heterocyclic group having 1 to 10 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 14 carbon atoms, an acyl group having 2 to 21 carbon atoms, an alkylsulfonyl group having 1 to 20 carbon atoms, an arylsulfonyl group having 6 to 14 carbon atoms, an aralkylsulfonyl group having 7 to 15 carbon atoms, a heterylsulfonyl group having 1 to 10 carbon atoms, a carbamoyl group having 1 to 25 carbon atoms, a sulfamoyl group having 0 to 32 carbon atoms, an alkoxycarbonyl group having 2 to 21 carbon atoms, an aryloxycarbonyl group having 7 to 15 carbon atoms, an acylamino group having 2 to 21 carbon atoms, a sulfonylamino group having 1 to 20 carbon atoms, and an amino group having 0 to 36 carbon atoms; and M represents two hydrogen atoms, a metal, a metal oxide, or a metal having a ligand.
16 . The method of recording information on an optical information recording medium of claim 15 , wherein M represents a metal selected from the group consisting of zinc, magnesium, copper, nickel, and palladium.
17 . The method of recording information on an optical information recording medium according to claim 15 , wherein all of R β1 to R β8 in the Formula (I) are simultaneously hydrogen atoms.
18 . The method of recording information on an optical information recording medium of claim 13 , wherein the medium further comprises a reflective layer of metal formed disposed on the recording layer.
19 . The method of recording information on an optical information recording medium of claim 13 , wherein the medium further comprises a protective layer disposed on the recording layer.
20 . The method of recording information on an optical information recording medium of claim 13 , wherein a pre-groove having a track pitch of 0.2 to 0.5 μm is formed on the surface of the substrate disposed with the recording layer of the medium.
21 . An optical information recording medium used in a method of recording information by irradiating the medium with a laser having a wavelength no greater than 450 nm, wherein a recording layer of the optical information recording medium is disposed on a substrate and contains a phthalocyanine compound represented by Formula (I):
wherein R α1 to R α8 and R β1 to R β8 each independently represents one selected from the group consisting of a hydrogen atom, an alkylsulfonyl group having 1 to 20 carbon atoms, an arylsulfonyl group having 6 to 14 carbon atoms, and an aralkylsulfonyl group having 7 to 15 carbon atoms; and M represents two hydrogen atoms, a metal, a metal oxide, or a metal having a ligand; and
wherein the recording layer has a refractive index (n) in a range of 1.5<n<1.9 and an extinction coefficient (k) in a range of 0.04<k<0.15.
22 . The optical information recording medium of claim 21 , wherein the recording layer is formed by coating a coating solution on said substrate.
23 . The optical information recording medium of claim 21 , wherein M represents a metal selected from the group consisting of zinc, magnesium, copper, nickel, and palladium.
24 . The optical information recording medium of claim 21 , wherein all of R β1 to R β8 in the Formula (I) are simultaneously hydrogen atoms.
25 . The optical information recording medium of claim 21 , wherein the medium further comprises a reflective layer of metal formed disposed on the recording layer.
26 . The optical information recording medium of claim 21 , wherein the medium further comprises a protective layer disposed on the recording layer.
27 . The optical information recording medium of claim 21 , wherein a pre-groove having a track pitch of 0.2 to 0.5 μm is formed on the surface of the substrate disposed with the recording layer of the medium.