JPH10116443A - Optical recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an optical recording medium to perform good recording and reproducing in different two wavelength regions by forming a recording layer and an optical interference layer both containing org. dyes as the main component and adding absorbent for light and/or accelerating agent for pyrolysis to the optical interference layer. SOLUTION: A recording layer 2' and an optical interference layer 3' are formed on a substrate 1', and further a reflection layer 4' is formed thereon. As for the org. dey incorporated into the recording layer, a pentamethine cyanine dye and the like can be used, and a phthalocyanine dye is preferable considering the light resistance and durability. As for the org. dye incorporated into the optical interference layer, a cyanine dye and the like can be used and an azo dye is preferable considering easy formation of a film, durability and recording characteristics. Further a naphthalocyanine absorbent for light and/or accelerating agent for pyrolysis such as metallicene are added to the optical interference layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium, and more particularly to an optical recording medium capable of recording and / or reproducing information for a plurality of laser wavelengths.

[0002]

2. Description of the Related Art As a recordable optical recording medium conforming to the compact disk (hereinafter abbreviated as CD) standard, a CD-R is used.
(CD-Recordable) is, for example, OPTICAL
DATA STORAGE 1989, TECHNICAL DIGEST SERIES vol.1 P
45 (1989) and is marketed. This CD
-R denotes a recording layer 2 on a transparent resin substrate 1 as shown in FIG.
The reflective layer 3 and the protective layer 4 are laminated in this order. By irradiating the recording layer with a high-power laser beam, the recording layer undergoes a physical or chemical change to record information in the form of pits. I do. By irradiating a low-power laser beam to the formed pit portion and detecting a change in reflectance, pit information can be reproduced. Generally, the wavelength of 770 to 830 nm is used for recording / reproduction of such an optical recording medium.
Since it uses a near-infrared semiconductor laser and conforms to CD standards such as Red Book and Orange Book,
It has the feature of being compatible with D players and CD-ROM players. However, the recording capacity of the above-mentioned conventional optical recording medium is about 650 MB, which is not sufficient in consideration of digital moving image recording, and the demand for higher density and larger capacity of information recording media is increasing.

Recently, a red semiconductor laser having a wavelength selected from 620 to 690 nm has been developed, and high-density recording and / or reproduction has been enabled. Using this semiconductor laser, a high-density recording medium having a recording capacity of 5 to 8 conventional media and a player corresponding to this high-density recording medium are being developed. For example, a DVD (DEGITAL VIDEO DISK) digitally recording a movie of two hours or more has been launched. 530n by harmonic conversion of YAG laser
Lasers with wavelengths around m and 420 nm have been put to practical use, and semiconductor lasers with wavelengths around 490 and 410 nm have been developed. However, even if high-density optical recording media and players using such short-wavelength lasers are considered and introduced, the continuity of software and recorded data must be maintained unless the optical recording media has compatibility between wavelengths. Is lost. At present, CD-R media on the market are 400-440, 480-540, 620-69.
When trying to reproduce with light of a wavelength selected from 0 nm, the reflectance is very small at 10% or less. In addition, the degree of modulation is small, and the reflectance of the recorded portion is larger than that of the unrecorded portion.
h recording, which is not preferable because the polarity is opposite to that of a normal CD (high to low recording). Further, a large distortion was observed in the recording waveform, and 400 to 440, 480 to 540, 6
High-density players equipped with a laser having a wavelength selected from 20 to 690 nm were difficult to reproduce.

JP-A-3-290835 discloses a medium in which an interference layer made of a low molecular organic substance is provided between a recording layer and a reflection layer made of an aluminum alloy. This medium uses an aluminum alloy instead of expensive gold for the reflection layer, and is provided with an interference layer to obtain a reflectance at 780 nm of 70% or more. Indeed, the reflectance at 780 nm is 70%. % Or more, but the reflectance for light having a wavelength selected from 400 to 690 nm is small and cannot be reproduced by a player supporting high-density media. JP-A-8-99467, JP-A-8-1
JP 08623 and the like have proposed an optical recording medium in which a dye-containing recording layer and a dye-containing optical interference layer are laminated. However, the recording characteristics of the medium according to these proposals, particularly the signal quality at short wavelength light, have not always been good. Further, as an example of an optical recording medium to which an additive is added in order to improve recording characteristics, there is JP-A-7-98887, but this is one in which an additive is added to the recording layer,
Additives are not added to a layer that is not directly related to recording, such as a light interference layer, to improve recording characteristics.

[0005]

DISCLOSURE OF THE INVENTION The present inventors have proposed an optical recording medium in which a recording layer containing a dye and an optical interference layer are laminated.
Surprisingly, due to the heat generated when the recording layer decomposes during recording, a part of the light interference layer also causes a chemical or physical change at the same time. It was difficult to obtain a good signal. An object of the present invention is to provide an optical recording medium that can perform good recording and / or reproduction with lasers of two different wavelengths.

[0006]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have come to propose the present invention. That is, this problem is solved by the following invention. The present invention provides (1) a recording layer, an optical interference layer, an optical recording medium having a reflective layer and a protective layer on a substrate, wherein the recording layer and the optical interference layer are layers containing an organic dye as a main component, and ,
(2) an optical recording medium comprising a light absorbing agent and / or a thermal decomposition accelerator added to the light interference layer; (2) an extinction coefficient k of 0.06 or more at a recording / reproducing laser wavelength λ1; Wherein the thermal decomposition accelerator decomposes at a lower temperature than the organic dye contained in the light interference layer and generates a large heat of decomposition, or generates a reactive radical (1). the optical recording medium according, (3) recording and / or reproducing using a laser beam having a wavelength λ1 is possible, can be recorded and / or reproduced using the wavelength lambda ₂ of 80nm or more shorter wavelength side than the wavelength lambda ₁ , and the and the refractive index n of the recording layer is the wavelength lambda ₁ in 1.8 or more, lambda ₂ in 1.0 above, the extinction coefficient k is lambda
₁ in 0.04 to 0.20, a 0.04 to 0.7 at lambda _2, and the refractive index of the optical interference layer n is the wavelength lambda ₁ in 1.5 or more, lambda ₂ in 1.7 above, extinction coefficient k is 0.02 at λ ₁
0.15, and wherein the at lambda ₂ is from 0.04 to 0.25 (2), wherein the optical recording medium,

[0007] (4) the refractive index n of the recording layer at the wavelength lambda ₁ 1.
9~2.7, λ ₂ in the 1.0 to 1.6, the extinction coefficient k is λ ₁
In from 0.04 to 0.16, it is at λ ₂ 0.1~0.7,
And the refractive index n of the optical interference layer at the wavelength lambda ₁ 1.7-2.
2, 1.8 to 2.7 at λ ₂ , extinction coefficient k is 0.0 at λ ₁
4 to 0.14, the optical recording medium according to an at _{λ 2 0.04~0.18 (3), (} 5) is capable of recording and reproducing with a wavelength lambda ₁ of the laser beam, the wavelength lambda the optical recording medium according to reproduction is possible using a _second laser beam (3), (6) the wavelength lambda ₁ of the laser beam is selected from a range of 770 to 830 nm, lambda ₂ is in the range of 620~690nm is selected, and, in the reflectance of the laser beam at a wavelength lambda ₁ as measured through the substrate is 65% or more, and the reflectance of the laser light at lambda ₂ is not less than 15% of (3) to (5) The optical recording medium according to any one of (7), wherein the wavelength λ _{1 of the} laser light is 770 to 770.
830 nm, and λ ₂ is 480-540.
is selected from the range of nm or the range of 400 to 440 nm, and the reflectance of the laser light at the wavelength λ ₁ measured through the substrate is 65% or more, and the reflectance of the laser light at λ ₂ is 15% or more. (3) The optical recording medium according to any one of (5) to (5), (8) the organic dye used in the light interference layer is an azo dye represented by the following general formula (1) or a chemical formula (5): The optical recording medium according to (6), comprising a metal complex of

[0008]

Embedded image Wherein A is a residue which, together with the nitrogen and carbon atoms to which it is attached, forms a heterocycle, and B, which is aromatic with the two carbon atoms to which it is attached. (X is a group having active hydrogen) (9) The organic dye used in the recording layer is represented by the following general formula (2)
(6) consisting of a phthalocyanine dye represented by the following formula (6):
The optical recording medium according to any one of (8),

[0009]

Embedded image (Wherein, Y _{1 to} Y ₄ are an oxygen atom or a sulfur atom, and Z _{1 to} Z
₄ is an unsubstituted or substituted hydrocarbon group having ₄ to 12 carbon atoms, X _{1 to} X ₄ represent a halogen atom,
l1 to l4 each represent an integer of 1 or 2, m1 to m4 each represent an integer of 0 to 3, and M represents two hydrogen atoms, a divalent or higher valent metal, a metal oxide or a halide.

(10) The wavelength λ _{1 of the} laser beam is 690 to 62
0 nm range, λ ₂ is 480-540 nm
Or from the range of 400 to 440 nm,
And the reflectance of the laser light at the wavelength λ ₁ measured through the substrate is 20% or more, and the reflectance of the laser light at the wavelength λ ₂ is 15% or more, according to any one of (3) to (5). optical recording medium, the wavelength lambda ₁ (11) laser light 480~540n
m, λ ₂ is selected from the range of 400 to 440 nm, and the reflectance of laser light at wavelength λ ₁ measured through the substrate is 20% or more, and the reflectance of laser light at λ ₂ The optical recording medium according to any one of (3) to (5), wherein the phthalocyanine dye is represented by at least one kind of the following general formula (3): Or a naphthalocyanine dye represented by the following general formula (4), wherein the thermal decomposition accelerator is a metallocene compound such as Fe (ferrocene), Ti, V, Mn,
Cr, Co, Ni, Mo, Ru, Rh, Zr, Lu, T
a, W, Os, Ir, Sc, Y, and other biscyclopentadienyl metal complexes, acetylacetonate complexes, phenanthroline complexes, bispyridine complexes, ethylenediamine complexes, ethylenediaminetetraacetic acid complexes, diethylenetriamine complexes, diethyleneglycoldimethylether complexes, diphosphino complexes, The optical recording according to any one of (3) to (7), which is at least one selected from the group consisting of a chelate complex such as a dimethylglyoximate complex, or a metal complex such as a carbonyl complex, a cyano complex, and an ammine complex. Media.

[0011]

Embedded image (Wherein, R ₁ and R ₂ represent a linear, branched or cyclic alkoxy group having 3 to 18 carbon atoms, and a —CH ₂ — group not bonded to an oxygen atom in the alkoxy group is substituted with an oxygen atom. R ₃ and R ₄ each represent a hydrogen atom or a halogen atom, and M represents two hydrogen atoms, a divalent metal, a metal oxide or a halide, provided that R ₁ and R ₂ ,
R ₃ and R ₄ may be interchanged. )

[0012]

Embedded image (Wherein, R _1, R ₂ and M are as defined above, R ₁
And R ₂ may be interchanged. )

[0013]

According to the present invention, a light absorbing layer is used as a recording layer and a light interference layer in which different organic dyes having the above-mentioned refractive index n and extinction coefficient k are laminated. And / or by adding a thermal decomposition accelerator,
0 to 440, 480 to 540, 620 to 690, 770
In an optical recording medium that is selected from two different wavelength regions from ８830 nm and that can be recorded and / or reproduced with a laser, the recording characteristics are improved. In other words, we observe that during recording, the dye in the recording layer is decomposed, burned, and deformed by laser light, but some of the dye used as the light interference layer is also chemically and physically changed. Have been. For this reason, the light interference layer changes halfway and pits are formed.

Thus, according to the present invention, by adding a light absorber and / or a thermal decomposition accelerator to the light interference layer,
When they generate heat or decompose, they promote chemical and physical changes of the light interference layer. Thus, it is presumed that the recording characteristics can be improved by forming pits in the recording layer and the light interference layer at once.

The term "recordable and / or reproducible" as used in the present invention means that recording and reproduction are possible at that wavelength, only recording is possible,
And three cases where only reproduction of data recorded at other wavelengths is possible.

The specific structure of the present invention will be described in detail below. In the present invention, the optical recording medium refers to both a read-only optical read-only medium on which information is recorded in advance and an optical recording medium capable of recording and reproducing information. However, here, as an example, an optical recording medium capable of recording and reproducing the latter information, particularly a recording layer, an optical interference layer, a reflective layer, and a protective layer formed on a substrate in this order, the optical recording medium and the reflective layer surface. An optical recording medium to which a substrate is attached will be described. In these optical recording media, as shown in FIG. 2, a recording layer 2 ′ and a light interference layer 3 ′ are formed on a substrate 1 ′, and a reflective layer 4 ′ is provided on the recording layer 2 ′. And a protective layer 5 'covers the reflective layer 4'. However, the stacking order of the recording layer 2 'and the light interference layer 3' may be reversed. Further, as shown in FIG. 3, a recording layer 2 ″ and a light interference layer 3 ″ are formed on a substrate 1 ″, and a reflective layer 4 ″ is provided thereon in close contact therewith. A substrate 6 ″ is bonded on the upper side via an adhesive layer 5 ″. However, the stacking order of the recording layer 2 ″ and the light interference layer 3 ″ may be reversed. As a material of the substrate, basically, any material may be used as long as it is transparent at the wavelength of the recording light and the reproducing light. For example, an acrylic resin such as a polycarbonate resin, a vinyl chloride resin and polymethyl methacrylate, a polymer material such as a polystyrene resin and an epoxy resin, and an inorganic material such as glass are used. These substrate materials are formed into a disk shape by injection molding or the like. If necessary, a groove may be formed on the substrate surface.

The organic dye contained in the recording layer used in the present invention has a laser wavelength (λ ₁ ) on the long wavelength side of 770.
830 nm, the maximum absorption wavelength (λ _max ) is 70
It exists near 0 nm, has a large refractive index at 770 to 830 nm, and has a relatively small absorbance. Specific examples, pentamethine cyanine dye, heptamethine cyanine dye, squarylium dye, azo dye, anthraquinone dye, naphthoquinone dye, indophenol dye, phthalocyanine dye, pyrylium dye,
Thiopyrylium dye, azurenium dye, triphenylmethane dye, xanthene dye, indanthrene dye, indigo dye, thioindigo dye, merocyanine dye, thiazine dye, acridine dye, oxazine dye, dithiol metal There are complex dyes and the like, but phthalocyanine dyes, azo dyes, cyanine dyes, and azurenium dyes are preferable, and phthalocyanine dyes are particularly preferable in terms of light resistance and durability. Further, phthalocyanine dyes represented by the following general formulas (2) and (9) are most preferable from the viewpoint of recording characteristics such as modulation degree, distortion of reproduced waveform, error rate, jitter, and deviation. The recording layer may contain a plurality of dyes.

[0018]

Embedded image (Wherein, Y _{1 to} Y ₄ are an oxygen atom or a sulfur atom, and Z _{1 to} Z
₄ is an unsubstituted or substituted hydrocarbon group having ₄ to 12 carbon atoms, X _{1 to} X ₄ represent a halogen atom,
l1 to l4 represent an integer of 1 or 2; m1 to m4 represent an integer of 0 to 3; M represents two hydrogen atoms, a divalent metal, a metal oxide or a halide. )

Specific examples of M in the phthalocyanine dye represented by the general formula (2) include Cu, Pd, Ni, M
g, a divalent metal such as Zn, Pb, and Cd; a metal oxide such as VO; and a halide of a metal such as AlCl. On the other hand, Z ₁ , Z ₂ , Z ₃ and Z _{4 each} have 4 to 1 carbon atoms.
2 unsubstituted or substituted hydrocarbon groups, specifically, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, dodecyl,
Cyclohexyl group, saturated hydrocarbon group such as dimethylcyclohexyl group, and unsaturated hydrocarbon group such as butenyl group, hexenyl group, octenyl group, dodecenyl group, phenyl group, methylphenyl group, butylphenyl group, hexylphenyl group and the like. Can be These hydrocarbon groups may be linear or branched. Further, these hydrocarbon groups may be substituted with a halogen, an amino group, an ether group or the like. Even when substituted with an amino group or an ether group, the total number of carbon atoms in the substituent is from 4 to 12. Also, X
Examples of the halogen represented by ₁ , X ₂ , X ₃ and X ₄ include fluorine, chlorine, bromine and iodine.

The substituents of X ₁ to X ₄ described above are attached to the benzene rings constituting phthalocyanine and Y ₁ to Y ₄
Is not particularly limited, and the type and number of the substituents may be different among four benzene rings in one molecule. Specific examples of preferable phthalocyanine dyes include, for example, the following dyes described in JP-A-3-62878, JP-A-3-41582, and JP-A-3-215466.
0 to 13).

[0021]

Embedded image

[0022]

Embedded image

[0023]

Embedded image

[0024]

Embedded image

The laser wavelength of λ ₁ is 620 to 690 nm
In the case of λmax exists around 580 nm,
It has a large refractive index at 690 nm and a small absorbance. Specific examples include trimethine cyanine dyes, squarylium dyes, azo dyes, anthraquinone dyes, indophenol dyes, pyrylium dyes, azurenium dyes, triphenylmethane dyes, xanthene dyes, and indanthrene dyes Indigo dyes, merocyanine dyes, thiazine dyes, acridine dyes, oxazine dyes, porphine dyes, azaporphine dyes, pyromethene dyes, and the like, preferably trimethine cyanine dyes, porphine dyes, It is an azaporphine dye, a pyromethene dye, or an azo dye, and may contain a plurality of dyes.

The laser wavelength of λ ₁ is 480 to 540 nm
In the case of λ _max exists around 440 nm,
It has a large refractive index at 540 nm and a relatively small absorbance. Specific examples include spiro dyes, ferrocene dyes, fluorein dyes, fulgide dyes, imidazole dyes, thiazole dyes, perylene dyes, phenazine dyes, phenothiazine dyes, polyene dyes, indole dyes, and aniline Dyes, azo dyes,
Quinone dye, cyanine dye, acridine dye, acridinone dye, quinophthalone dye, phenoxazine dye, diphenylamine dye, coumarin dye,
Carbostyril dyes, porphine dyes, squarylium dyes, oxazine dyes, pyromethene dyes and the like, preferably, porphine dyes, quinophthalone dyes, quinone dyes, pyromethene dyes, azo dyes, It may contain a plurality of dyes.

In the present invention, the organic dye contained in the light interference layer has a laser wavelength (λ ₂ ) on the short wavelength side of 62.
In the case of 0 to 690 nm, λ _max exists near 580 nm, the refractive index at 620 to 830 nm is large, and the absorbance is small. Specifically, cyanine dyes, squarylium dyes, azo dyes, naphthoquinone dyes,
Anthraquinone dyes, porphyrin dyes, tetraazaporphine dyes, acridine dyes, oxazine dyes, pyrromethene dyes and the like, preferably azo dyes, porphine dyes, cyanine dyes, pyromethene dyes, Azo dyes are preferred from the viewpoint of ease of film formation and durability. Furthermore, an azo dye represented by the following general formula (1) or a metal complex of the azo dye is most preferable from the viewpoint of recording characteristics. Note that the light interference layer may contain a plurality of dyes.

[0028]

Embedded image Wherein A is a residue that forms a heterocycle with the nitrogen and carbon atoms to which it is attached, and B is a residue that is taken together with the two carbon atoms it is attached to X is a group having active hydrogen.) Specifically, in the azo dye represented by the general formula (1), a heterocyclic ring represented by A Include, for example, thiazole ring, benzothiazole ring, pyridobenzothiazole ring, benzopyridothiazole ring, pyridothiazole ring, pyridine ring, quinoline ring, thiadiazole ring, imidazole ring and the like. Preferably, it is a pyridine ring or a thiadiazole ring.

These heterocycles preferably have one or more substituents. Specific examples of the substituent include an alkyl group, a halogenated alkyl group, an aryl group, an alkoxy group, a halogenated alkoxy group, and an aryloxy group. Group, alkylthio group, halogenated alkylthio group, arylthio group, aralkyl group, halogen atom, cyano group, nitro group, ester group, carbamoyl group, acyl group, acylamino group, sulfamoyl group, sulfonamide group, amino group, hydroxyl group, Examples thereof include a phenylazo group, a pyridinoazo group, and a vinyl group, and these substituents may further have a substituent. Preferred substituents among the substituents on the heterocyclic ring are an alkyl group having 1 to 15 carbon atoms which may have a substituent, and a fluoroalkyl group having 1 to 15 carbon atoms which may have a substituent. Having 1 carbon atom which may have a substituent
~ 25 alkoxy group, halogen atom, cyano group, nitro group, C1-C15 alkylthio group which may have a substituent, C1-C15 fluoroalkylthio group which may have a substituent 1 group which may have a group or a substituent
~ 15 alkylsulfamoyl group, optionally substituted phenylsulfamoyl group having 6 to 20 carbon atoms, optionally substituted phenylazo group, optionally substituted Pyridinoazo group, an ester group having 2 to 16 carbon atoms,
A carbamoyl group having 2 to 16 carbon atoms, an acyl group having 2 to 16 carbon atoms, an acylamino group having 2 to 15 carbon atoms, a sulfonamide group having 1 to 15 carbon atoms, -NR ₅ R ₆ (R ₅ and R ₆ are each Independently a hydrogen atom, carbon atom 1 which may have a substituent
Represents an alkyl group or a phenyl group which may have a substituent, and R ₅ and R ₆ may together form a 5- or 6-membered ring), a hydroxyl group, -C
R ₇ ＣC (CN) R ₈ (R ₇ is a hydrogen atom or a carbon atom having 1 to
6 represents an alkyl group, and R ₈ represents a cyano group or a group having 2 to 2 carbon atoms.
7 represents an alkoxycarbonyl group).
In addition, all the alkyl groups described above may be sulfonated, nitrated, cyanated, halogenated, acetylated, or hydroxylated.

Examples of the residue forming the aromatic ring represented by B in the general formula (1) include a benzene ring, a naphthalene ring, a pyridone ring, a pyridine ring and a pyrazole ring.
Preferred is a benzene ring, particularly preferred is one substituted with at least one electron donating group. Examples of such a substituent include an alkyl group, a halogenated alkyl group, an aryl group, an alkoxy group, a halogenated alkoxy group, an aryloxy group, an alkylthio group, a halogenated alkylthio group, an arylthio group, an aralkyl group, a halogen atom, a cyano group, and a nitro group. Groups, ester groups, carbamoyl groups, acyl groups, acylamino groups, sulfamoyl groups, sulfonamide groups, amino groups, hydroxyl groups, phenylazo groups, pyridinoazo groups, vinyl groups, and the like. May be. Among the substituents on the aromatic ring, preferred substituents are an alkyl group having 1 to 15 carbon atoms which may have a substituent, and a fluoroalkyl group having 1 to 15 carbon atoms which may have a substituent. An alkoxy group having 1 to 25 carbon atoms which may have a substituent, a halogen atom, a cyano group, a nitro group, an alkylthio group having 1 to 15 carbon atoms which may have a substituent, Fluoroalkylthio group having 1 to 15 carbon atoms which may be substituted, alkylsulfamoyl group having 1 to 15 carbon atoms which may have a substituent, 6 to 20 carbon atoms which may have a substituent Phenylsulfamoyl group, a phenylazo group which may have a substituent, a pyridinoazo group which may have a substituent, an ester group having 2 to 16 carbon atoms, a carbamoyl group having 2 to 16 carbon atoms, carbon An acyl group having 2 to 16 carbon atoms, an acylamino group having 1 to 15 carbon atoms, and 1 to 1 carbon atoms 15 sulfonamide group, -NR ₅ R
₆ (R ₅ and R ₆ are as defined above), a hydroxyl group,-
CR ₇ ＣC (CN) R ₈ (R ₇ and R ₈ are the same as above)
And the like. Particularly preferred electron donating groups include
A monoalkylamino group having 1 to 8 carbon atoms which may have a substituent, a dialkylamino group having 2 to 8 carbon atoms which may have a substituent, and a carbon number which may have a substituent 1
An alkoxy group having 8 to 8 carbon atoms, an alkyl group having 1 to 8 carbon atoms which may have a substituent, an aryloxy group having 6 to 12 carbon atoms which may have a substituent, And aralkyl groups having 7 to 12 carbon atoms, carbamoyl groups, amino groups, and hydroxyl groups. In addition, the alkyl group site | part of all the said substituents may be sulfonated, nitrated, cyanated, halogenated, acetylated, or hydroxylated.

[0031] As the X in the general formula (1) is not particularly limited as long as it is a group having an active hydrogen, preferred _{are, -OH, -COOH, -SO 3 H} , -B (O
H) _2, represents a -NHSO ₂ R ₉ (R ₉ is a hydrogen atom, which may have a may have a substituent alkyl group or a substituted group of 1 to 25 carbon atoms a phenyl group), - CON
H ₂ , —SO ₂ NH ₂ , —NH _{2 and the} like. Particularly preferred are —OH, —COOH, —SO ₃ H,
—NHSO ₂ R ₉ (R ₉ is as defined above).
When X is a group that can be dissociated into an anion such as —OH, —COOH, or —SO ₃ H, it may be used as it is when forming the azo metal complex compound. It may be used in the form of a salt with ions. Examples of such cations include inorganic cations such as Na ⁺ , Li ⁺ , and K ⁺ , P ⁺ (C ₆ H ₅ ) ₄ , N ⁺ (C ₂ H ₅ ) ₄ , N
^And organic cations such as ⁺ (C ₄ H ₉ ) ₄ and C ₆ H ₅ N ⁺ (CH ₃ ) ₃ .

In the present invention, the azo dye is used as a metal complex. Examples of the metal capable of forming a complex with an azo dye include Ni, Co, Fe, and R.
u, Rh, Pd, Cu, Zn, Mn, Os, Ir, Pt
Transition metals such as Ni, Co, Cu, P
d, Mn, and Zn are preferred. These are acetate,
Halides, BF ₄ ^- are used in the form of such salts, Ni ^2+,
It is obtained as a complex coordinated to an azo dye as Co ²⁺ , Co ³⁺ , Cu ²⁺ , Pd ²⁺ , Mn ²⁺ , Zn ²⁺ or the like. The azo metal complex compound may be used alone or as a mixture of a plurality of compounds.

The metal complex of the azo dye used in the present invention is, for example, Furukawa; Analytica Chimica Acta 140 (1982) 28
It can be synthesized according to the method described in 1-289. Preferred specific examples of the metal complex of the azo dye used in the present invention include the following azo compound (Formula 15) and Ni ²⁺ , Co
Complexes such as ²⁺ , Co ³⁺ , Cu ²⁺ , Pd ²⁺ , Mn ²⁺ , Zn ^{2+ and the} like can be mentioned. Furthermore, the compounds described in Japanese Patent Publication No. 5-67438 and International Patent Application No. WO91 / 18950, Tables 1 to 9 and the like can be mentioned.

[0034]

Embedded image

The laser wavelength of λ ₂ is 480 to 540 nm
In the case of λ _max exists around 440 nm and 480 to 5
It has a large refractive index at 40 nm and a small absorbance. Specifically, spiro dyes, ferrocene dyes, fluorene dyes, fulgide dyes, imidazole dyes, thiazole dyes, perylene dyes, phenazine dyes, phenothiazine dyes, polyene dyes, indole dyes, aniline Dyes, azo dyes, quinone dyes, cyanine dyes, acridine dyes, acridinone dyes, quinophthalone dyes, phenoxazine dyes,
Diphenylamine dyes, coumarin dyes, carbostyril dyes, porphine dyes, oxazine dyes, pyromethene dyes and the like are preferred, but porphine dyes, quinophthalone dyes, quinone dyes, pyromethene dyes, cyanine dyes It is a dye or an azo dye, and may contain a plurality of dyes.

The laser wavelength of λ ₂ is 400 to 440 nm
In the case of λ _max exists around 350 nm, and 400 to 4
It has a large refractive index at 40 nm and a small absorbance. Specifically, spiro dyes, stilbene dyes, fluorein dyes, imidazole dyes, perylene dyes, phenazine dyes, phenothiazine dyes, polyene dyes, quinone dyes, cyanine dyes, acridine dyes, There are acridinone-based dyes, coumarin-based dyes, carbostyril-based dyes, porphine-based dyes, squarylium-based dyes, and the like, preferably, polyene-based dyes, stilbene-based dyes, and quinone-based dyes, which contain a plurality of dyes. Is also good.

In the present invention, the light absorbing agent added to the light interference layer has an extinction coefficient of 0.06 or more at the longer wavelength laser wavelength (λ ₁ ) and extinction at the shorter wavelength laser wavelength (λ ₂ ). There is no particular limitation as long as the coefficient is 0.6 or less and heat or decomposition heat is generated after light absorption.

As a specific example of the light absorbing agent, a wavelength of 620
To 690 and 770 to 830 nm, cyanine dyes, squarylium dyes, azo dyes, anthraquinone dyes, naphthoquinone dyes, indophenol dyes, phthalocyanine dyes, naphthalocyanine dyes, and tetraazaporphine dyes , Pyrylium dyes, thiopyrylium dyes, azurenium dyes, triphenylmethane dyes, xanthene dyes, indanthrene dyes, indigo dyes, thioindigo dyes, merocyanine dyes, thiazine dyes, acridine dyes, oxazine Dyes and dithiol metal complex dyes. When the laser beam of λ ₁ is selected from 770 to 830 nm, it is preferably a phthalocyanine dye or a naphthalocyanine dye, and particularly preferably represented by the following general formula (3):
The phthalocyanine dye having the structure of 6) or the naphthalocyanine dye represented by the following general formula (4) (Formula 17) is most preferable, and examples thereof are shown in Table 1 (Table 1). Note that a plurality of dyes may be mixed. The addition of these light absorbing agents to the recording layer is not excluded at all.

[0039]

Embedded image (Wherein, R ₁ and R ₂ represent a linear, branched or cyclic alkoxy group having 3 to 18 carbon atoms, and a —CH ₂ — group not bonded to an oxygen atom in the alkoxy group is substituted with an oxygen atom. R ₃ and R ₄ each represent a hydrogen atom or a halogen atom, and M represents two hydrogen atoms, a divalent metal, a metal oxide or a halide, provided that R ₁ and R ₂ ,
R ₃ and R ₄ may be interchanged. )

[0040]

Embedded image (Wherein, R _1, R ₂ and M are as defined above, R ₁
And R ₂ may be interchanged. ) In the table, Ph represents phthalocyanine, Nph represents naphthalocyanine,
D represents the following group (Chemical Formula 18).

[0041]

[Table 1]

[0042]

Embedded image

Wavelength 400-440 and 480-540n
When recording in m, spiro dye, ferrocene dye,
Fluorine dye, fulgide dye, imidazole dye, thiazole dye, perylene dye, phenazine dye, phenothiazine dye, polyene dye, indole dye, aniline dye, azo dye, quinone dye, cyanine Dyes, acridine dyes, acridinone dyes, quinophthalone dyes, phenoxazine dyes, diphenylamine dyes, coumarin dyes, carbostyril dyes, porphine dyes, and the like, and a plurality of dyes may be added. The addition of these light absorbing agents to the recording layer is not excluded at all. In addition,
The mixing ratio of the organic dye and the light absorber used in the light interference layer is generally in the range of about 1 to 10: 1 by weight. However,
If the amount is too small, the effect will not appear,
Conversely, if the amount is too large, the original role of the light interference layer may be impaired, so that the mixing ratio is preferably 3 to 3 in weight.
7: 1.

Further, the thermal decomposition accelerator of the present invention decomposes at a lower temperature than the light interference layer, and generates a large heat of decomposition.
Alternatively, it is preferable to generate a reactive radical. Examples of the thermal decomposition accelerator include lead compounds such as tetraethyl lead and tetramethyl lead which are metal anti-knocking agents, Mn compounds such as Simantrene [Mn (C ₅ H ₅ ) (CO) ₃ ], and , A metallocene compound Fe
(Ferrocene), Ti, V, Mn, Cr, Co, Ni,
Mo, Ru, Rh, Zr, Lu, Ta, W, Os, I
Biscyclopentadienyl metal complexes such as r, Sc, and Y can be mentioned. Among them, ferrocene, ruthenocene, osmocene, nickelocene, titanocene and derivatives thereof have a good thermal decomposition promoting effect. In addition to metallocene, metal formate, metal oxalate, metal laurate, metal naphthenate, metal stearate,
Organic acid metal compounds such as metal butyrate compounds, acetylacetonate complexes, phenanthroline complexes, bispyridine complexes, ethylenediamine complexes, ethylenediaminetetraacetic acid complexes, diethylenetriamine complexes, diethyleneglycol dimethylether complexes, chelating complexes such as dimethylglyoximate complexes, carbonyl Metal complexes such as complexes, cyano complexes and ammine complexes; metal halide compounds; inorganic metal salts such as metal nitrate compounds and metal sulfate compounds; and metal oxide compounds. It is desirable that the metal compound used herein is soluble in an organic solvent and has good wet heat resistance and light resistance. In particular, acetylacetonate complexes and carbonyl complexes are very preferable in that good solubility can be obtained. The metal is preferably iron, cobalt or chromium. Among the thermal decomposition accelerators, organometallic complexes such as metallocene are particularly preferable, and nitrocellulose can also be used. The above-mentioned thermal decomposition accelerator may introduce a substituent, mix a plurality thereof, or add an additional substance such as a binder, if necessary. The addition of these thermal decomposition accelerators to the recording layer is not excluded at all.

The mixing ratio of the organic dye used in the light interference layer to the thermal decomposition accelerator is generally 1: 0.1 to 1 in terms of molar ratio.
It is in the range of 0. However, if the added amount is too small, the effect is not exhibited, and if it is too large, the original role of the light interference layer may be impaired. Therefore, the mixing ratio is preferably 1: 0 in molar ratio. 0.5 to 1.5.

When forming the recording layer and the light interference layer, a metallocene compound such as a biscyclopentadienyl metal complex, a resin such as ethyl cellulose, an acrylic resin, a polystyrene resin, a urethane resin, a leveling agent, a defoaming agent And the like can be used together as long as the effects of the present invention are not impaired. Further, if necessary, additives such as a quencher and an ultraviolet absorber can be mixed or introduced as a substituent. The content of the organic dye used in these recording layers and light interference layers is 30% or more, preferably 60% or more.

In the present invention, the optical constant is a complex refractive index (n
+ Ki). N and k in the expression are coefficients corresponding to the real part and the imaginary part. Here, n is a refractive index and k is an extinction coefficient. In general, an organic dye has a feature that the refractive index n and the extinction coefficient k greatly change with respect to the wavelength λ. Utilizing this feature, a light interference layer is formed using an organic dye having a preferable optical constant at each laser wavelength. Thereby, a high reflectance can be obtained at each laser wavelength.

In consideration of the characteristics of the organic dye, the optical constant of the recording layer at wavelength λ ₁ is such that n is 1.8 or more, preferably 1.9 to 2.7, and k is 0.04 to 0.04. 0.2
0, preferably 0.04 to 0.16. In λ ₂ , n is 1.0 or more, preferably 1.0 to 1.6,
And k is 0.04 to 0.7, preferably 0.1 to 0.1.
7, and the optical constant of the light interference layer is:
At the wavelength λ ₁ , n is 1.5 or more, preferably 1.
7 to 2.2, and k is 0.02 to 0.15, preferably 0.04 to 0.14. In λ _2, it is preferable that n is 1.7 or more, preferably 1.8 to 2.7, and k satisfies 0.04 to 0.25, preferably 0.04 to 0.18. Further, the average of the refractive index and the extinction coefficient of the recording layer and the optical interference layer at the wavelength λ ₁ are 1.8 to 2.4, 0.04 to 0.16, and the average of the refractive index and the extinction coefficient at λ ₂ , respectively. 1.5 to 2.1 respectively,
It is preferably 0.08 to 0.3. The main role of the optical interference layer used here is to improve the reflectance at each laser wavelength.

Next, the manufacturing method of the present invention will be described.
The above compound or dye is formed on a substrate by a coating method such as a spin coating method or a casting method, a sputtering method, a chemical vapor deposition method, or a vacuum vapor deposition method to form a layer having a thickness of 30 to 300 nm, preferably 50 to 150 nm. A recording layer or an optical interference layer. If the thickness of the recording layer is less than 30 nm, recording cannot be performed due to large thermal diffusion, or a recording signal will be distorted, and signal amplitude will be reduced to not satisfy the CD standard. On the other hand, when the film thickness is larger than 300 nm, the reflectivity decreases and the reproduction signal characteristics deteriorate. On the other hand, if the thickness of the light interference layer is much smaller than 30 nm, the light enhancement effect becomes small and the reflectance improvement effect cannot be obtained. Further, it is preferable that the thickness of the light interference layer satisfies the following expression, and is adjusted to a value at which the reflectance increases for each laser wavelength.

0.6 × λ / 4n <d <1.5 × λ / 4n (where λ is the laser wavelength, n is the refractive index of the light interference layer,
(d is the thickness of the light interference layer) In the coating method, a coating solvent in which a dye is dissolved or dispersed is used, and it is preferable to select a solvent that does not damage the substrate. For example, methyl alcohol,
Alcoholic solvents such as ethyl alcohol, propyl alcohol, butyl alcohol, allyl alcohol, furfuryl alcohol, methyl cellosolve, ethyl cellosolve, and tetrafluoropropanol; hexane, heptane,
Aliphatic or alicyclic hydrocarbon solvents such as octane, decane, cyclohexane, methylcyclohexane, dimethylcyclohexane, trimethylcyclohexane and propylcyclohexane; aromatic hydrocarbon solvents such as toluene, xylene and benzene; carbon tetrachloride, chloroform, etc. Halogenated hydrocarbon solvents; ether solvents such as diethyl ether, dibutyl ether, diisopropyl ether, dioxane, and tetrahydrofuran; ketone solvents such as acetone; ester solvents such as ethyl acetate; Used.

The organic dye used for the recording layer and the organic dye used for the light interference layer are each dissolved in solvents having different polarities, and are not dissolved in the other solvent, and the second dye layer is applied. In this case, it is preferable not to hinder the first layer. For example, a dye used for one dye layer is a solvent having a high polarity, such as an alcohol-based solvent, or dissolved in water, and a dye used for the other dye layer is a solvent having a low polarity, for example, aliphatic or It is applied by dissolving in an alicyclic hydrocarbon solvent, aromatic hydrocarbon solvent, carbon tetrachloride or ether solvent. In order to reduce the obstacle to the resinous substrate or the influence of the multilayer film, the solvent for each dye layer coating and forming must be an aliphatic or alicyclic hydrocarbon-based solvent or a mixture of these and other solvents. A combination of a solvent, an alcohol-based solvent, and a mixed solvent of these and other solvents, each of which is soluble in each other, is particularly desirable.

The solubility of the organic dye in the coating solvent can be improved by introducing an appropriate substituent into the dye molecule. For example, in order to be easily dissolved in a low-polarity solvent, the following substituents, for example, an alkyl group, an alkenyl group, an alkoxy group, an alkylallyl group, an alkylcarbonyl group, an alkoxycarbonyl group, an alkylamino group,
An alkylimino group, an alkylcarboxamide group, an alkanoylimino group, an alkylsulfanyl group, an alkylsulfenyl group, an alkylsulfonamide group, or the like may be introduced. On the other hand, in order to easily dissolve in a highly polar solvent, the following substituents, for example, amino group, carboxyl group, carbamoyl group, mercapto group, mercaptoamino group, sulfamoyl group, sulfonic acid group, sulfonamino group Etc. may be introduced. The recording layer can also be used by dispersing a dye in a polymer thin film or the like. When a solvent that does not damage the substrate cannot be selected, a sputtering method, a chemical vapor deposition method, a vacuum vapor deposition method, or the like is effective. The light absorber and the thermal decomposition accelerator must be dissolved in the solvent used when applying the dye for the light interference layer.

Next, on the recording layer or the light interference layer,
A reflective layer having a thickness of 300 nm, preferably 100 to 150 nm is formed. As a material of the reflection layer, a material having a sufficiently high reflectance at the wavelength of the reproduction light, for example, Au, Al, Ag, Cu,
The metals of Ti, Cr, Ni, Pt, Ta and Pd can be used alone or as an alloy. Among them, Au, Al and Ag have high reflectivity and are suitable as a material for the reflective layer. In addition, the following may be included. For example, Mg, Se, Hf, V, Nb, Ru, W,
Mn, Re, Fe, Co, Rh, Ir, Zn, Cd, G
a, In, Si, Ge, Te, Pb, Po, Sn, Bi
And metal and semimetals. Also, A
Those containing u as a main component are preferable because a reflection layer having a high reflectance can be easily obtained. Here, the main component means a component having a content of 50% or more. Note that it is also possible to form a multilayer film by alternately stacking low-refractive-index thin films and high-refractive-index thin films with a material other than a metal and use it as a reflective layer.

As a method of forming the reflection layer, for example,
Examples include a sputtering method, an ion plating method, a chemical vapor deposition method, and a vacuum vapor deposition method. In addition, a reflection amplification layer and an adhesive layer may be provided between the recording layer and the reflection layer in order to increase the reflectance and improve the adhesion. Further, a protective layer is formed on the reflective layer. The material of the protective layer is not particularly limited as long as it protects the reflective layer from external force.
Examples of the organic substance include a thermoplastic resin, a thermosetting resin, an electron beam curable resin, and a UV curable resin. Inorganic substances include SiO ₂ , Si ₃ N ₄ , M
gF ₂ , SnO _{2 and the} like. Thermoplastic resin, thermosetting resin, etc. are dissolved in an appropriate solvent and a coating liquid is applied,
It can be formed by drying. The UV curable resin can be formed by preparing a coating solution as it is or by dissolving it in an appropriate solvent, applying the coating solution, and irradiating with UV light to cure the resin. UV
As the curable resin, for example, urethane acrylate,
Acrylate resins such as epoxy acrylate and polyester acrylate can be used. These materials may be used alone or as a mixture, or may be used not only as a single layer but also as a multilayer film.

As a method of forming the protective layer, a coating method such as a spin coating method or a casting method, a sputtering method, a chemical vapor deposition method, or the like is used as in the case of the recording layer. Among them, the spin coating method is preferable. . The thickness of the protective layer is generally in the range of 0.1 to 100 μm, but is preferably 3 to 30 μm, more preferably 5 to 20 μm in the present invention. Printing of a label or the like can be further performed on the protective layer. Alternatively, a means such as bonding a protective sheet or a substrate to the reflective layer surface, or bonding two optical recording media with the reflective layer surfaces facing each other and facing each other may be used.

The laser used in the present invention is 40
0 to 440, 480 to 540, 620 to 690, 770
Any laser can be used as long as it has a wavelength of 〜830 nm. For example, a dye laser capable of wavelength selection in a wide range of the visible region, a YAG harmonic conversion laser with a wavelength of 532 nm, a harmonic conversion laser with a wavelength of 430 nm and 425 nm, a wavelength of 6
33nm helium neon laser, wavelength 635nm,
650 nm, 680 nm infrared semiconductor laser, wavelength 7
There is a near-infrared semiconductor laser with a wavelength of 70 to 830 nm, and a semiconductor laser is preferable in consideration of mounting on a device.

[0057]

EXAMPLES Examples of the present invention will be shown below, but the present invention is not limited by these examples. Example 1 0.25 g of a phthalocyanine compound represented by the following formula (5) (formula 19) was added to dimethylcyclohexane 1
A dye solution 1 dissolved in 0 ml is prepared. The substrate is made of polycarbonate resin and has a continuous guide groove (track pitch: 1.6 μm), a diameter of 120 mm, and a thickness of 1.
A 2 mm disc was used. The substrate was spin-coated at 1600 rpm and dried at 70 ° C. for 2 hours to form an 80 nm recording layer. The optical constants of this recording layer are n = 2.2 and k = 0.08 at 780 nm, n = 1.2 and k = 0.50 at 680 nm,
At 650 nm, n is 1.2, k is 0.51, and 63
At 5 nm, n is 1.1 and k is 0.34. further,
0.2 g of an azo compound represented by the following formula (6):
And Compound 5 in Table 1 as a light absorber were mixed in a weight ratio of 5: 1, and dissolved in 10 ml of 2,2,3,3-tetrafluoro-1-propanol to prepare a dye solution 2. . This dye solution 2 was spin-coated on the recording layer at 1500 rpm and dried at 70 ° C. for 2 hours to form an 80 nm light interference layer. The optical constant of this light interference layer is 780n
At m, n is 2.0 and k is 0.09, at 680 nm, n is 2.1, k is 0.09, at 650 nm, n is 2.2, k is 0.08, and at 635 nm, n is 2.
3, k is 0.11. In addition, 780 nm of compound 5
Was 0.20.

[0058]

Embedded image

Au was sputtered on this light interference layer using a sputtering apparatus (CDI-900) manufactured by Balzers Co., Ltd.
A reflective layer having a thickness of 100 nm was formed. Argon gas was used as a sputtering gas. The sputtering conditions were as follows: a sputtering power of 2.5 kW and a sputtering gas pressure of 1.0 × 10 ⁻² To.
rr. Further, an ultraviolet curing resin SD is provided on the reflection layer.
After spin coating with -17 (manufactured by Dainippon Ink and Chemicals, Inc.), the layer was irradiated with ultraviolet rays to form a protective layer having a thickness of 6 μm, thereby producing an optical recording medium. The optical recording medium is a Sony writer (CDU-
921S), an EFM signal was recorded at a linear velocity of 2.4 m / s and an optimum laser power. After recording, the signal was reproduced using a commercially available CD player (YAMAHA CDX-1050, laser wavelength 786 nm), and the reflectance, error rate, and modulation were measured. All showed good values satisfying the Orange Book standard. Next, a signal was reproduced from the recorded medium using an optical disk evaluation device (DDU-1000) manufactured by Pulstec Industrial equipped with a red semiconductor laser head of 680 nm, 650 nm, and 635 nm, and the reflectance, jitter, error rate, and degree of modulation were measured. It was measured. All exhibited good values. Thus, this medium was able to perform recording and reproduction favorably with a plurality of laser wavelengths. Note that the error rate and the jitter were measured using a Kenwood CD decoder (DR3552) and an ADC.
The measurement was performed using a TIA-175 time interval analyzer manufactured by the company, and the degree of modulation was determined by the following equation. Modulation degree = {(maximum signal strength)-(minimum signal strength)}
/ (Maximum signal strength)

Example 2 An optical recording medium was prepared in the same manner as in Example 1, except that Compound 3 in Table 1 was used as a light absorbing agent. The optical constant of the light interference layer is 7
At 80 nm, n is 2.0, k is 0.06, and 680n
At m, n is 2.1 and k is 0.09, at 650 nm, n is 2.2, k is 0.11, and at 635 nm, n is n.
Was 2.3 and k was 0.12. In addition, 7 of compound 3
The k at 80 nm was 0.13. The produced medium was recorded using a Sony writer equipped with a 780 nm semiconductor laser head in the same manner as in Example 1. After recording, the same measurements as in Example 1 were performed, and as a result, all showed good recording characteristics.

Example 3 An optical recording medium was prepared in the same manner as in Example 1, except that Compound 10 shown in Table 1 was used as a light absorbing agent. The optical constant of the light interference layer is
At 780 nm, n is 2.0, k is 0.06, and 680
In nm, n is 2.1, k is 0.09, and 650 nm
In the results, n was 2.2 and k was 0.12, and at 635 nm, n was 2.3 and k was 0.11. Compound 10
The k at 780 nm was 0.11. The produced medium was recorded using a Sony writer equipped with a 780 nm semiconductor laser head in the same manner as in Example 1. After recording,
As a result of performing the same measurement as in Example 1, all showed good recording characteristics.

Example 4 An optical recording medium was prepared in the same manner as in Example 1, except that the compound represented by the following formula (7) (Formula 20) was used for the recording layer. The optical constants of the recording layer are n = 2.2 and k = 0.11 at 780 nm, n = 1.5 and k = 0.54 at 680 nm,
At 650 nm, n is 1.5, k is 0.49, and 63
At 5 nm, n was 1.5 and k was 0.33. The produced medium was recorded using a Sony writer equipped with a 780 nm semiconductor laser head in the same manner as in Example 1. After recording, the same measurements as in Example 1 were performed, and as a result, all showed good recording characteristics.

[0063]

Embedded image

Example 5 An optical recording medium was produced in the same manner as in Example 1, except that the compound represented by the following formula (8) (Formula 21) was used for the light interference layer. The optical constant of the optical interference layer is n = 2.0 and k = 0.06 at 780 nm.
At 680 nm, n is 2.1 and k is 0.09; at 650 nm, n is 2.2 and k is 0.11;
At 635 nm, n was 2.2 and k was 0.10. The produced medium was recorded using a Sony writer equipped with a 780 nm semiconductor laser head in the same manner as in Example 1. After recording, the same measurements as in Example 1 were performed, and as a result, all showed good recording characteristics.

[0065]

Embedded image

Comparative Example 1 An optical recording medium was produced in the same manner as in Example 1, except that no light absorbing agent was added to the light interference layer. The optical constant of the light interference layer is n = 2.0 at 780 nm, k = 0.06, and n = 2 at 680 nm.
2, k is 0.05, n is 2.3 at 650 nm,
k was 0.06, n was 2.4 and k was 0.10. The prepared medium was changed to 7 in the same manner as in Example 1.
Recording was performed using a Sony writer equipped with an 80 nm semiconductor laser head. After recording, the same measurement as in Example 1 was performed. As a result, jitter at 650 nm and 635 nm was poor.

Comparative Example 2 An optical recording medium was produced in the same manner as in Example 2, except that the light absorbing agent was added to the light interference layer so that the weight ratio became 1: 1. The optical constants of the light interference layer are n = 2.1 and k = 0.08 at 780 nm,
At 680 nm, n is 1.8, k is 0.28, and 65
At 0 nm, n is 1.9, k is 0.37, and 635n
In m, n was 1.9 and k was 0.23. The produced medium was recorded using a Sony writer equipped with a 780 nm semiconductor laser head in the same manner as in Example 1. After recording, the same measurement as in Example 1 was performed.
The jitter at 0 nm and 635 nm was poor. When each of the above media is recorded at 780 nm, 786 nm,
Reflectance, error rate, modulation factor, and 650 nm and 635 at the time of reproduction at 680 nm, 650 nm, and 635 nm
The jitter (3T pit / land) in nm is shown in Table 2 (Table 2).

[0068]

[Table 2] Jitter: 3T PIT / LAND Error rate: cps

Example 6 An optical recording medium was produced in the same manner as in Example 1, except that a porphine compound represented by the following formula (9) (Formula 22) was used for the light interference layer. The optical constant of the light interference layer is n = 1.8 at 780 nm,
k was 0.07, and at 532 nm, n was 2.2 and k was 0.10. The prepared medium was changed to 7 in the same manner as in Example 1.
Using a Sony writer equipped with an 80 nm semiconductor laser head, an EFM signal was recorded at a linear velocity of 2.4 m / s and an optimum laser power. After recording, the signal was reproduced and evaluated using a commercially available CD player. As a result, the reflectance was 73%,
The error rate was 6 cps and the modulation factor was 0.75, all of which were good values satisfying the Orange Book standard. Next, a signal was reproduced from the recorded medium by an optical disk evaluation apparatus equipped with a 532 nm YAG harmonic conversion laser head. As a result, the reflectance was 31% and the 3T pit jitter was 21.
3T land jitter is 24, error rate is 8 cps
And the degree of modulation was 0.76, which was a good value. In addition, a medium in which no light absorber was added to the light interference layer was similarly prepared and evaluated. As a result, at 532 nm, the jitter was 35 or more and the error rate was 30 cps or more.

[0070]

Embedded image

Example 7 The procedure of Example 1 was repeated, except that the light interference layer used was a polyene compound represented by the following formula (10) and the light absorber was Compound 6 shown in Table 1. Thus, an optical recording medium was manufactured. The optical constants of the optical interference layer were n = 1.8 and k = 0.06 at 780 nm, and n = 2.3 and k = 0.11 at 430 nm. Using a Sony writer equipped with a 780 nm semiconductor laser head as in Example 1,
An EFM signal was recorded at a linear velocity of 2.4 m / s and an optimum laser power. After recording, the signal was reproduced and evaluated using a commercially available CD player. As a result, the reflectance was 72%, the error rate was 7 cps, and the modulation was 0.74, all of which were good values satisfying the Orange Book standard. Next, a signal was reproduced from the recorded medium using an optical disk evaluation device equipped with a 430 nm harmonic conversion laser head.
0%, 3T pit jitter is 22, 3T land jitter is 25, error rate is 8 cps, and modulation degree is 0.75.
And all showed good values. As a result of preparing and evaluating a medium in which a light absorber was not added to the light interference layer in the same manner, 43
0nm, jitter 35 or more, error rate 30c
It was worse than ps.

[0072]

Embedded image

Example 8 A dye solution 1 was prepared by dissolving 0.20 g of a tetraazaporphine compound represented by the following formula (11) in 10 ml of ethylcyclohexane. The substrate is made of polycarbonate resin and has a continuous guide groove (track pitch: 0.80 μm) and a diameter of 12 μm.
A disk-shaped one having a diameter of 0 mm and a thickness of 0.6 mm was used. On this substrate, spin coating was performed at 1600 rpm, and dried at 70 ° C. for 2 hours to form an 85 nm recording layer. The optical constant of this recording layer is 635 nm and n is 2.
2, k is 0.08, n is 1.2 at 532 nm,
k was 0.55. Further, the following formula (12)
0.2 g of the quinophthalone compound represented by the formula 4) and the azo compound represented by the formula (6) as a light absorber were mixed at a weight ratio of 5: 1, and 2,2,3,3, -tetrafluoro
-1- Dissolve in 10 ml of propanol to prepare Dye Solution 2. The dye solution 2 was applied onto the recording layer at a rotational speed of 1500.
Spin coat at rpm, dry at 70 ° C for 2 hours,
A light interference layer of nm was formed. The optical constant of this light interference layer is n = 2.0 and k = 0.06 at 635 nm.
At 32 nm, n was 2.3 and k was 0.10. Note that k at 635 nm of the azo compound of the formula (6) is 0.1
It was 0. The reflective layer was formed by sputtering Ag on the light interference layer using a sputtering apparatus (CDI-900, manufactured by Balzers) to form a reflective layer having a thickness of 100 nm. Argon gas was used as a sputtering gas. The sputtering conditions were as follows: a sputtering power of 2.5 kW and a sputtering gas pressure of 1.0 × 10 ⁻² T.
orr. Further, an ultraviolet curable resin S is provided on the reflective layer.
After spin-coating D-301 (manufactured by Dainippon Ink and Chemicals, Inc.), a polycarbonate resin substrate having a diameter of 120 mmφ and a thickness of 0.6 mm was placed thereon, and irradiated with ultraviolet rays to produce an optical recording medium bonded thereto.

[0074]

Embedded image An optical disc evaluation device (DDU manufactured by Pulstec Industrial) having a 635 nm semiconductor laser head mounted on this optical recording medium.
After recording at a linear velocity of 5.6 m / s and a laser power of 10 mW using the -1000), the evaluation was performed with the same evaluation apparatus. As a result, the reflectance was 52%, the error rate was 7 cps, and the modulation was 0.74. Signal characteristics were obtained. Next, a signal was reproduced from the recorded medium using an optical disk evaluation device equipped with a 532 nm YAG harmonic conversion laser head. As a result, the reflectivity was 29%, the 3T pit jitter was 23, and the 3T
The land jitter was 24, the error rate was 8 cps, and the modulation was 0.74, all of which were good values. In addition, a medium in which no light absorber was added to the light interference layer was similarly prepared and evaluated. As a result, at 532 nm, the jitter was 35 or more and the error rate was 30 cps or more.

Example 9 An optical recording medium was produced in the same manner as in Example 8, except that the compound of the formula (10) was used for the light interference layer. The optical constant of the light interference layer is 6
At 35 nm, n is 1.9, k is 0.07, and 430n
In m, n was 2.3 and k was 0.11. An optical disk evaluation device (DDU-100 manufactured by Pulstec Industrial) equipped with a 635 nm semiconductor laser head mounted on this optical recording medium.
0), a linear velocity of 5.6 m / s and a laser power of 1
After recording at 0 mW, the result of the reproduction evaluation by the same evaluation apparatus was as a result.
A good signal characteristic of 73 was obtained. Next, a signal was reproduced from the recorded medium by an optical disk evaluation device equipped with a 430 nm harmonic conversion laser head, and as a result, the reflectance was 3
2%, 3T pit jitter is 22, 3T land jitter is 23, error rate is 8 cps and modulation is 0.75.
And all showed good values. As a result of preparing and evaluating a medium in which a light absorber was not added to the light interference layer in the same manner, 43
0nm, jitter 35 or more, error rate 30c
It was worse than ps.

Example 10 The following formula (13)
A dye solution 1 was prepared by dissolving 0.20 g of the dipyrromethene compound represented by the following formula in 10 ml of ethylcyclohexane.
The substrate is made of polycarbonate resin and has a continuous guide groove (track pitch: 0.80 μm) and a diameter of 120 mm.
A disk having a diameter of φ and a thickness of 0.6 mm was used. Spin coating is performed on this substrate at a rotation speed of 1800 rpm,
Drying was performed at 2 ° C. for 2 hours to form a recording layer having a thickness of 80 nm. The optical constants of this recording layer are n = 2.4 and k = 0.13 at 532 nm, and n = 1.2 and k = 0.3 at 430 nm.
65. Further, 0.2 g of the compound represented by the formula (10) and the compound of the formula (9) as a light absorber were mixed at a weight ratio of 5: 1, and 2,2,3,3-tetrafluoroethylene was added. Dissolve in 10 ml of fluoro-1-propanol and add dye solution 2
Is prepared. This dye solution 2 is applied onto the recording layer at a rotation speed of 1
Spin coating was performed at 600 rpm and dried at 70 ° C. for 2 hours to form an 80 nm light interference layer. The optical constants of this light interference layer were n = 2.0 and k = 0.09 at 532 nm, and n = 2.2 and k = 0.11 at 532 nm. The k at 532 nm of the compound of the formula (9) was 0.10. Thereafter, a bonded optical recording medium was manufactured in the same manner as in Example 8.

[0077]

Embedded image Pulstec Industrial Optical Disk Evaluation System (D) equipped with a 532 nm harmonic conversion laser head mounted on this optical recording medium.
After recording at a linear velocity of 5.6 m / s and a laser power of 9 mW using DU-1000), the same evaluation apparatus was used to evaluate the reproduction. As a result, the reflectance was 48%, the error rate was 8 cps, and the modulation factor was 0.73. Good signal characteristics were obtained. Next, a signal was reproduced from the recorded medium by an optical disk evaluation device equipped with a 430 nm harmonic conversion laser head. As a result, the reflectance was 28%, the 3T pit jitter was 23, the 3T land jitter was 25, the error rate was 9 cps, and the modulation was performed. The degree was 0.76, which was a good value. A medium in which no light absorber was added to the light interference layer was similarly prepared and evaluated. As a result, at 430 nm, the jitter was 35 or more, and the error rate was 30 cps or more.

Example 11 After forming a recording layer in the same manner as in Example 1, 0.2 g of the azo compound represented by the following formula (14) (formula 26) and ) In a molar ratio of 1:
1 and dissolved in 2,2,3,3-tetrafluoro-1-propanol 10 ml. This solution was spin-coated on the recording layer at a rotation speed of 1500 rpm,
After drying for an hour, a light interference layer of 80 nm was formed. The optical constants of this optical interference layer are 1.9 and k are 0.05 at 780 nm, and 2.1 at 680 nm and k is 0.1.
04, n = 2.2 and k = 0.05 at 650 nm
At 635 nm, n was 2.4 and k was 0.08. Thereafter, an optical recording medium was manufactured in the same manner as in Example 1.

[0079]

Embedded image An EFM signal was recorded on the optical recording medium using a Philips writer (CDD-521) equipped with a 780 nm semiconductor laser head at a linear velocity of 2.4 m / s and a laser power of 11 mW. After recording, a commercially available CD player (YAMAHA CDX-1050, laser wavelength 78)
6 nm), and reproduces the deviation (11
T pit), reflectance, error rate, and degree of modulation. All showed good values satisfying the Orange Book standard.

Next, the recorded medium is set to 680 nm, 65
Pulstec Industrial Optical Disk Evaluation System (DDU-) equipped with 0 nm and 635 nm red semiconductor laser heads
1000), and the reflectance, error rate and modulation were measured. All exhibited good values.
Next, this medium was used as an optical disk evaluation device (DD) manufactured by Pulstec Industrial, equipped with a 680 nm red semiconductor laser head.
U-1000) and a KENWOOD EFM encoder with a linear velocity of 2.4 m / s and a laser power of 10
Recorded in mW. After recording, the signal was reproduced using an evaluation device equipped with a 680 nm and 635 nm red semiconductor laser head, and the reflectance, error rate, and modulation were measured. This recorded medium is used as a commercially available CD player (YAMAHA CDX-10).
50, a laser wavelength of 786 nm).
A signal recorded by a nm drive (DDU-1000) was reproduced, and the deviation (11T pit), the reflectance, the error rate, and the modulation were measured. . Thus, this medium was able to perform recording and reproduction favorably with a plurality of laser wavelengths. The deviation is A
It measured using DC TIA-175 time interval analyzer.

Example 12 An optical recording medium was produced in the same manner as in Example 11, except that the following formula (16) (Formula 27) was used as the thermal decomposition accelerator. The optical constants of the optical interference layer are n = 1.8 and k = 0.06 at 780 nm, n = 2.0 and k = 0.04 at 680 nm, and n = 2.1 and k = 650 at 650 nm. 0.06,
At 635 nm, n was 2.2 and k was 0.08. A Philips lighter equipped with a 780 nm semiconductor laser head and a 680 nm
optical disk evaluation device (DDU-1000) manufactured by Pulstec Industrial equipped with a nm semiconductor laser head and K
Recording was performed using an ENWOOD EFM encoder.
After recording, the same measurements as in Example 1 were performed, and as a result, all showed good recording characteristics.

[0082]

Embedded image

Example 13 An optical recording medium was prepared in the same manner as in Example 1, except that the following formula (17) (Formula 28) was used as the thermal decomposition accelerator. The optical constants of the optical interference layer are n = 1.8 and k = 0.06 at 780 nm, n = 1.9 and k = 0.05 at 680 nm, and n = 2.0 and k = 650 at 650 nm. 0.06,
At 635 nm, n was 2.2 and k was 0.07. A Philips writer equipped with a 780 nm semiconductor laser head and a 680 n
Pulstec Industrial Optical Disk Evaluation System (DDU-1000) equipped with m red semiconductor laser head and KE
Recording was performed using an NWOOD EFM encoder. After recording, the same measurements as in Example 1 were performed, and as a result, all showed good recording characteristics.

[0084]

Embedded image

Comparative Example 3 An optical recording medium was produced in the same manner as in Example 1, except that the thermal decomposition accelerator was not added to the light interference layer. As in Example 1, the produced medium was a Philips writer equipped with a 780 nm semiconductor laser head and a Pulstec Industrial Optical Disk Evaluation System (DD) equipped with a 680 nm red semiconductor laser head.
U-1000) and KENWOOD EFM encoder. After recording, the same measurement as in Example 1 was performed. As a result, the deviation at 780 nm was poor. For each of the media obtained in Examples 11 to 13 and Comparative Example 3, in each case of recording at 780 and 680 nm, deviation (11T pit), reflectance, and error at the time of reproduction at 786, 680, 650, and 635 nm Table 3 (Tables 3 and 4) summarizes the rate and the modulation factor.

[0086]

[Table 3]

[0087]

[Table 4] Deviation: 11T PIT Error rate: cps

Example 14 An optical recording medium was produced in the same manner as in Example 11, except that the porphine compound represented by the formula (9) was used instead of the formula (14) as the dye of the light interference layer. Was prepared. The optical constants of the light interference layer were n = 1.8 and k = 0.05 at 780 nm, and n = 2.2 and k = 0.08 at 532 nm. The prepared medium was used in the same manner as in Example 11 using a Philips writer equipped with a 780 nm semiconductor laser head and a linear velocity of 2.4 m / s and a laser power of 11 mW.
Recorded the EFM signal. After recording, the signal was reproduced and evaluated using a commercially available CD player.
(1T pit) was -47, the reflectance was 74%, the error rate was 9 cps, and the modulation was 0.76, all of which were good values satisfying the Orange Book standard. Next, as a result of reproducing a signal from the recorded medium using an optical disk evaluation apparatus equipped with a 532 nm YAG harmonic conversion laser head, the reflectance was 31%, the error rate was 9 cps, and the modulation factor was 0.78, which were all good values. Indicated. A medium in which the thermal decomposition accelerator was not added to the light interference layer was similarly prepared and evaluated. As a result, the deviation (11T pit) at 780 nm was as poor as −60 or less, and the reflectance and modulation at 532 nm were small. .

Example 15 An optical recording medium was produced in the same manner as in Example 11, except that the polyene compound represented by the formula (10) was used instead of the formula (14) as the dye of the light interference layer. Was prepared. The optical constants of the optical interference layer were n = 1.8 and k = 0.04 at 780 nm, and n = 2.3 and k = 0.09 at 430 nm. The prepared medium was used in the same manner as in Example 11 using a Philips writer equipped with a 780 nm semiconductor laser head and a linear velocity of 2.4 m / s and a laser power of 11 mW.
Recorded the EFM signal. After recording, the signal was reproduced and evaluated using a commercially available CD player.
(1T pit) was -50, the reflectance was 75%, the error rate was 8 cps, and the modulation was 0.76, all of which were good values satisfying the Orange Book standard. Next, a signal was reproduced from the recorded medium using an optical disk evaluation device equipped with a 430 nm harmonic conversion laser head. As a result, the reflectance was 30%, the error rate was 11 cps, and the modulation was 0.7.
7 showed good values. A medium in which the thermal decomposition accelerator was not added to the light interference layer was similarly prepared and evaluated. As a result, the deviation (11T pit) at 780 nm was as poor as −60 or less, and the reflectance and modulation at 430 nm were small. .

Example 16 In Example 8, instead of adding the compound of the formula (6) as a light absorbing dye to the light interference layer, the compound of the formula (15) was used as a thermal decomposition accelerator. An optical recording medium was prepared in the same manner, except that it was added at a molar ratio of 1: 1 to the dye. The optical constant of the light interference layer was 1.9 at 635 nm, k was 0.05, and 2.2 at 532 nm, k was 0.07. An optical disc evaluation device (D) manufactured by Pulstec Industrial which has a 635 nm semiconductor laser head
After recording at a linear velocity of 5.6 m / s and a laser power of 10 mW using a DU-1000), the reproduction was evaluated by the same evaluation apparatus. As a result, the deviation (11T pit) was -49, the reflectance was 51%, and the error rate was Good signal characteristics of 7 cps and a modulation factor of 0.74 were obtained. Next, as a result of reproducing a signal from the recorded medium using an optical disk evaluation device equipped with a 532 nm YAG harmonic conversion laser head, the reflectance was 35%, the error rate was 8 cps, and the modulation factor was 0.76, all good values. Indicated. A medium in which the thermal decomposition accelerator was not added to the light interference layer was similarly prepared and evaluated. As a result, the deviation (11T pit) at 635 nm was as bad as −60 or less, and the reflectance and modulation at 532 nm were small. .

Example 17 In Example 9, instead of adding the compound of the formula (6) as a light absorbing dye to the light interference layer, the compound of the formula (16) was used as a thermal decomposition accelerator. An optical recording medium was prepared in the same manner, except that it was added at a molar ratio of 1: 1 to the dye. The optical constants of the light interference layer were 1.8 for n at 635 nm and 0.05 for k, and 2.2 for k at 532 nm and 0.08. An optical disc evaluation device (D) manufactured by Pulstec Industrial which has a 635 nm semiconductor laser head
After recording at a linear velocity of 5.6 m / s and a laser power of 10 mW using DU-1000), the reproduction and evaluation were performed by the same evaluation apparatus. As a result, the deviation (11T pit) was -48, the reflectance was 49%, and the error rate was Good signal characteristics of 10 cps and a modulation factor of 0.74 were obtained. Next, a signal was reproduced from the recorded medium using an optical disk evaluation apparatus equipped with a 430 nm harmonic conversion laser head. As a result, the reflectance was 32%, the error rate was 9 cps, and the modulation factor was 0.77.
And all showed good values. In addition, as a result of similarly preparing and evaluating a medium in which the thermal decomposition accelerator was not added to the light interference layer,
The deviation at 635 nm (11T pit) is -6
0 or less, the reflectance at 430 nm and the modulation were reduced.

Example 18 In Example 10, instead of adding the compound of formula (9) as a light absorbing dye to the light interference layer, the compound of formula (17) was used as a thermal decomposition accelerator. An optical recording medium was prepared in the same manner, except that it was added at a molar ratio of 1: 1 to the dye. The optical constants of the light interference layer were n = 1.9 and k = 0.06 at 532 nm, and n = 2.1 and k = 0.08 at 430 nm. Using an optical disk evaluation device (DDU-1000) manufactured by Pulstec Industrial equipped with a 532 nm harmonic conversion laser head on this optical recording medium, a linear velocity of 5.6 m / s,
After recording at a laser power of 9 mW, the reproduction was evaluated by the same evaluation apparatus. As a result, the deviation (11T pit) was -49,
Good signal characteristics were obtained with a reflectance of 50%, an error rate of 10 cps and a modulation factor of 0.74. Next, a signal was reproduced from the recorded medium using an optical disk evaluation device equipped with a 430 nm harmonic conversion laser head. As a result, the reflectance was 30%, the error rate was 9 cps, and the modulation was 0.7.
6 and all showed good values. A medium in which the thermal decomposition accelerator was not added to the light interference layer was similarly prepared and evaluated. As a result, the deviation (11T pit) at 532 nm was as poor as −60 or less, and the reflectance and modulation at 430 nm were small. .

Example 19 In Example 1, when forming the light interference layer, the thermal decomposition accelerator of the formula (15) was further added to the dye solution for spin coating of the light interference layer with respect to the azo dye. An optical recording medium was prepared in the same manner as above except that the molar ratio was 1: 1. The optical constants of the light interference layer were 1.9 at n at 780 nm and 0.07 at k, and 2.3 at 635 nm and k at 0.09. Using a Sony writer equipped with a 780 nm semiconductor laser head as in Example 1,
An EFM signal was recorded at a linear velocity of 2.4 m / s and an optimum laser power. After recording, the signal was reproduced and evaluated using a commercially available CD player. As a result, the deviation (11T pit) was obtained.
Are 43, the reflectance is 74%, the error rate is 6 cps, and the modulation is 0.76, all of which are good values satisfying the Orange Book standard. Next, this recorded medium is stored in 635
As a result of reproducing the signal with an optical disk evaluation device equipped with a nm semiconductor laser head, the reflectivity was 33%, the 3T pit jitter was 21, the 3T land jitter was 22, the error rate was 7 cps, and the modulation was 0.79, all of which were good. Value.

[0094]

According to the present invention, in a two-layer medium in which a recording layer and an optical interference layer each having an organic dye as a main component and having an appropriate refractive index and extinction coefficient are laminated, a light absorber and a light absorbing agent are added to the optical interference layer. /
Alternatively, by adding a thermal decomposition accelerator, it was possible to provide a compatible optical recording medium capable of excellent recording and / or reproduction in two different wavelength regions.

[Brief description of the drawings]

FIG. 1 is a sectional structural view showing a layer configuration of a conventional optical recording medium.

FIG. 2 is a sectional structural view showing a layer configuration of the optical recording medium of the present invention.

FIG. 3 is a sectional structural view showing a layer configuration of the optical recording medium of the present invention.

[Explanation of symbols]

 1: substrate 2: recording layer 3: reflective layer 4: protective layer 1 ′: substrate 2 ′: recording layer 3 ′: light interference layer 4 ′: reflective layer 5 ′: protective layer 1 ″: substrate 2 ″: recording layer 3 ": Light interference layer 4": Reflective layer 5 ": Adhesive layer (protective layer) 6": Substrate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tomoyoshi Sasagawa 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsui Toatsu Chemicals Co., Ltd. (72) Inventor Denmi Misawa 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa (72) Inventor Kenichi Sugimoto 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Yasumi Nishimoto 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Inventor Takeshi Takeda 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd.

Claims (12)

[Claims] 1. An optical recording medium having a recording layer, an optical interference layer, a reflective layer, and a protective layer on a substrate, wherein the recording layer and the optical interference layer are layers containing an organic dye as a main component, and An optical recording medium comprising a light absorbing agent and / or a thermal decomposition accelerator added to the light interference layer. 2. The method according to claim 1, wherein the light absorbing agent is a recording / reproducing laser wavelength λ _1.
Has an extinction coefficient k of 0.06 or more, and the thermal decomposition accelerator decomposes at a lower temperature than the organic dye contained in the light interference layer to generate a large heat of decomposition, or has a reactive activity. The optical recording medium according to claim 1, which generates radicals. 3. Recording and / or reproduction can be performed using a laser beam having a wavelength of λ ₁ , and recording and / or reproduction can be performed using a wavelength λ ₂ that is at least 80 nm shorter than the wavelength λ ₁ , and the recording layer refractive index n wavelengths lambda ₁ at 1.8 or more, lambda ₂ in 1.0 above, the extinction coefficient k is at lambda ₁ 0.04 to
0.20 is at lambda ₂ .04-.7, and the refractive index n of the optical interference layer is a wavelength lambda ₁ in 1.5 above, in the lambda ₂ 1.7
Above, the optical recording medium of claim 2, the extinction coefficient k is equal to or in lambda ₁ 0.02 to 0.15, which is at lambda ₂ .04 to .25. 4. The recording layer has a refractive index n of 1.9 at a wavelength λ ₁ .
To 2.7, lambda ₂ in 1.0 to 1.6, with ₁ extinction coefficient k lambda .04 to .16, and 0.1 to 0.7 at lambda _2, and the optical interference 1.7 to 2 the refractive index n of the layer at the wavelength lambda _1.
2, 1.8 to 2.7 at λ ₂ , extinction coefficient k is 0.0 at λ ₁
The optical recording medium according to claim 3, wherein the optical recording medium has a value of ₄ to 0.14 and a value of λ2 of 0.04 to 0.18. 5. The optical recording medium according to claim 3, wherein recording and reproduction can be performed using a laser beam having a wavelength of λ ₁ , and reproduction can be performed using a laser beam having a wavelength of λ ₂ . 6. A laser beam having a wavelength λ ₁ of 770 to 830.
is selected from the range of nm, lambda ₂ is selected from the range of 620～690Nm, and the wavelength lambda measured through the substrate
The reflectance of the laser light at ₁ is 65% or more and λ ₂
The reflectivity of the laser beam at the surface is 15% or more.
6. The optical recording medium according to any one of 5. 7. A laser beam having a wavelength λ ₁ of 770 to 830.
is selected from the range of nm, lambda ₂ is selected from the scope or range of 400~440nm of 480～540Nm, and in the reflectance of the laser beam at a wavelength lambda ₁ as measured through the substrate is 65% or more, and in lambda ₂ The optical recording medium according to any one of claims 3 to 5, wherein the reflectance of the laser light is 15% or more. 8. The optical recording medium according to claim 6, wherein the organic dye used in the light interference layer comprises an azo dye represented by the following general formula (1) or a metal complex of the azo dye. Embedded image Wherein A is a residue which, together with the nitrogen and carbon atoms to which it is attached, forms a heterocycle, and B, which is aromatic with the two carbon atoms to which it is attached. It is a residue forming a ring, and X is a group having active hydrogen.) 9. The optical recording medium according to claim 6, wherein the organic dye used in the recording layer comprises a phthalocyanine dye represented by the following general formula (2). Embedded image (Wherein, Y _{1 to} Y ₄ are an oxygen atom or a sulfur atom, and Z _{1 to} Z
₄ is an unsubstituted or substituted hydrocarbon group having ₄ to 12 carbon atoms, X _{1 to} X ₄ represent a halogen atom,
l1 to l4 represent an integer of 1 or 2, m1 to m4 represent an integer of 0 to 3, and M represents two hydrogen atoms, a divalent metal, a metal oxide or a halide. ) 10. A laser beam having a wavelength λ ₁ of 690 to 62.
0 nm range, λ ₂ is 480-540 nm
Or from the range of 400 to 440 nm,
And in the reflectance of the laser beam at a wavelength lambda ₁ as measured through the substrate is 20% or more, and an optical recording according to any one of claims 3-5 reflectance of the laser beam is 15% or more in lambda ₂ Medium. 11. The wavelength λ _{1 of the} laser beam is 480-54.
0 nm, λ ₂ is 400-440 nm
Wavelength λ selected from the range and measured through the substrate
The reflectance of the laser light at ₁ is 20% or more, and the reflectance of the laser light at λ ₂ is 15% or more.
The optical recording medium according to any one of the above. 12. The light absorbing agent is at least one phthalocyanine dye represented by the following general formula (3) or (formula 3) or a naphthalocyanine dye represented by the following general formula (4) (formula 4): The thermal decomposition accelerator is a metallocene compound such as Fe (ferrocene), Ti, V, Mn, Cr, Co,
Ni, Mo, Ru, Rh, Zr, Lu, Ta, W, O
biscyclopentadienyl metal complexes such as s, Ir, Sc and Y, acetylacetonate complexes, phenanthroline complexes, bispyridine complexes, ethylenediamine complexes, ethylenediaminetetraacetic acid complexes, diethylenetriamine complexes,
8. A chelate complex such as a diethylene glycol dimethyl ether complex, a diphosphino complex, or a dimethylglyoximate complex, or at least one selected from the group consisting of a metal complex such as a carbonyl complex, a cyano complex, and an ammine complex. An optical recording medium according to claim 1. Embedded image (Wherein, R ₁ and R ₂ represent a linear, branched or cyclic alkoxy group having 3 to 18 carbon atoms, and a —CH ₂ — group not bonded to an oxygen atom in the alkoxy group is substituted with an oxygen atom. R ₃ and R ₄ each represent a hydrogen atom or a halogen atom, and M represents two hydrogen atoms, a divalent metal, a metal oxide or a halide, provided that R ₁ and R ₂ ,
R ₃ and R ₄ may be interchanged. ) (Wherein, R _1, R ₂ and M are as defined above, R ₁
And R ₂ may be interchanged. )