Optical recording medium and recording and/or reproduction method using the same
First Claim
1. An optical recording medium comprising a substrate and a recording layer formed thereon comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR15## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto, wherein said azo metal chelate compound exhibits a maximum absorption in a wavelength range of 450 to 630 nm.
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Accused Products
Abstract
An optical recording medium has a substrate and a recording layer which is formed on the substrate and contains an azo metal chelate compound including an azo moiety of formula (I) and a bivalent or trivalent metal; ##STR1## wherein X is OH group, CooH group or CONH2 group; Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. In addition, there is provided a method of recording information and reproducing the information using the above-mentioned optical recording medium.
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Citations
25 Claims
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1. An optical recording medium comprising a substrate and a recording layer formed thereon comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR15## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto, wherein said azo metal chelate compound exhibits a maximum absorption in a wavelength range of 450 to 630 nm. - View Dependent Claims (2, 3, 4, 5)
- ##STR15## wherein X is OH group, COOH group or CONH2 group;
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6. An optical recording medium comprising a substrate and a recording layer formed thereon comprising an azo metal chelate compound and a bivalent or trivalent metal, wherein the azo moiety of said azo metal chelate compound is represented by formula (II):
- ##STR16## wherein R1 is a hydrogen atom or an alkyl group;
R2 and R3 are each independently a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, an alkenyl group which may have a substituent, a halogen atom, nitro group or cyano group, and R2 and R3 may form a ring together;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (7)
- ##STR16## wherein R1 is a hydrogen atom or an alkyl group;
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8. An optical recording medium comprising a substrate and a recording layer formed thereon comprising an azo metal chelate compound and a bivalent or trivalent metal, wherein the azo moiety of said azo metal chelate compound is represented by the formula (III):
- ##STR18## wherein R4 is a hydrogen atom or an alkyl group;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (9)
- ##STR18## wherein R4 is a hydrogen atom or an alkyl group;
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10. An optical recording medium comprising a substrate and a recording layer formed thereon comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR20## wherein X is OH group. COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto, wherein said recording layer further comprises a dyestuff which exhibits a maximum absorption in a wavelength range of 680 to 750 nm. - View Dependent Claims (11)
- ##STR20## wherein X is OH group. COOH group or CONH2 group;
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12. A method of reproducing recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR21## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto, wherein said azo metal chelate compound for use in said optical recording medium exhibits a maximum absorption in a wavelength range of 450 to 630 nm.
- ##STR21## wherein X is OH group, COOH group or CONH2 group;
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13. A method of reproducing recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound and a bivalent or trivalent metal,
wherein the azo moiety of said azo metal chelate compound for use in said optical recording medium is represented by the formula (II): - ##STR22## wherein R1 is a hydrogen atom or an alkyl group;
R2 and R3 are each independently a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, an alkenyl group which may have a substituent, a halogen atom, nitro group or cyano group, and R2 and R3 may form a ring together;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (14)
- ##STR22## wherein R1 is a hydrogen atom or an alkyl group;
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15. A method of reproducing recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound and a bivalent or trivalent metal, wherein the azo moiety of said azo metal chelate compound for use in said optical recording medium is represented by formula (III):
- ##STR24## wherein R4 is a hydrogen atom or an alkyl group;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (16)
- ##STR24## wherein R4 is a hydrogen atom or an alkyl group;
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17. A method of reproducing recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR26## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto,wherein said recording layer of said optical recording medium further comprises a dyestuff which exhibits a maximum absorption in a wavelength range of 680 to 750 nm. - View Dependent Claims (18)
- ##STR26## wherein X is OH group, COOH group or CONH2 group;
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19. A method of recording information and/or reproducing said recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal:
- ##STR27## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto, wherein said azo metal chelate compound exhibits a maximum absorption in a wavelength range of 450 to 630 nm.
- ##STR27## wherein X is OH group, COOH group or CONH2 group;
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20. A method of recording information and/or reproducing said recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound and a bivalent or trivalent metal, wherein the azo moiety of said azo metal chelate compound for use in said optical recording medium is represented by formula (II):
- ##STR28## wherein R1 is a hydrogen atom or an alkyl group;
R2 and R3 are each independently a hydrogen atom, an alkyl group which may have a substituent, an aryl group which may have a substituent, an alkenyl group which may have a substituent, a halogen atom, nitro group or cyano group, and R2 and R3 may form a ring together;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (21)
- ##STR28## wherein R1 is a hydrogen atom or an alkyl group;
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22. A method of recording information and/or reproducing said recorded information, which comprises the step of applying a laser beam in a wavelength range of 620 to 690 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising an azo metal chelate compound and a bivalent or trivalent metal, wherein the azo moiety of said azo metal chelate compound for use in said optical recording medium is represented by formula (III):
- ##STR30## wherein R4 is a hydrogen atom or an alkyl group;
X is OH group, COOH group or CONH2 group; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (23)
- ##STR30## wherein R4 is a hydrogen atom or an alkyl group;
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24. A method of recording information and/or reproducing said information, which comprises the step of applying a laser beam in a wavelength range of 770 to 830 nm to an optical recording medium which comprises a substrate, a recording layer formed thereon, and a reflection layer formed on said recording layer, said recording layer comprising:
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a dyestuff which exhibits a maximum absorption in a wavelength range of 680 to 750 nm, and an azo metal chelate compound which comprises an azo moiety of formula (I) and a bivalent or trivalent metal;
##STR32## wherein X is OH group, COOH group or CONH2 group;
Y is a residual group forming a heterocyclic ring in combination with nitrogen atoms bonded thereto; and
Z is a residual group forming an aromatic ring in combination with carbon atoms bonded thereto. - View Dependent Claims (25)
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Specification