JPH07334863A - Optical recording medium and its production - Google Patents

Abstract

PURPOSE:To obtain an optical recording medium having a proper complex index of refraction in a prescribed wavelength region of laser light by forming a light absorbing layer based on compds. each having a prescribed compsn. on a substrate. CONSTITUTION:A light absorbing layer based on a metallophthalocyanine compd. represented by formula I and a nitrogen-contg. compd. selected from among optionally substd. or cyclized amino, imino and azo compds. represented by formula II is formed on a substrate. In the formula II, R<1> is 1-4C alkyl or 1-4C alkoxy and each of R<2>-R<5> is 1-4C alkyl, 1-4C alkoxy, halogen or H. The molecular association of the phthalocyanine compd. is inhibited and the objective optical recording medium having a proper complex index of refraction in the region of 760-800nm as the wavelength region of laser light is obtd.

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 having improved optical characteristics and a manufacturing method thereof.

[0002]

2. Description of the Related Art In recent years, the development of a write-once CD (compact disc) has become active. This is a conventional CD
Unlike a CD, a user can record information and the signal after recording satisfies the standard of the conventional CD, so that a commercial CD
It has the feature that it can be played back by the player. As one of methods for realizing such a medium, Japanese Patent Laid-Open No. 2-4
In Japanese Patent No. 2652, it is proposed that a dye is spin-coated on a substrate to provide a light absorption layer, and a metal reflection layer is provided behind it. Furthermore, Japanese Patent Laid-Open No. 2-13
As described in Japanese Patent No. 2656, by appropriately selecting the complex refractive index and the film thickness of the light absorption layer, the signal after recording satisfies the CD standard, and a write-once CD can be realized.

[0003]

However, Japanese Unexamined Patent Application Publication No.
The write-once type CDs using the dyes disclosed in JP-A-42652 and JP-A-2-132656 are still insufficient in light resistance. In other words, the signal characteristics change when exposed to sunlight for a long time, and the CD
There is a drawback that the standard cannot be satisfied. This is because the dye material used for the light absorption layer, particularly the cyanine dye that has been used conventionally, changes due to light. Therefore, in order to suppress this change, JP-A-63-63
It is known to contain a light stabilizer in the light absorption layer as disclosed in Japanese Patent Publication No. 159090. But,
When the light stabilizer is added in a small amount (20% or less), sufficient light resistance cannot be obtained, and conversely, when added in a large amount (20% or more), the optical and / or heat of the light absorption layer is not increased. However, there has been a problem that various characteristics are changed and various signal qualities are deteriorated.

On the other hand, as another means for improving the light resistance,
It has also been proposed to use a phthalocyanine compound, which is a highly light-resistant dye, as a material for the light-absorbing layer (JP-A-58-18).
Nos. 3296 and 58-37851). But,
In general, the phthalocyanine compound is insufficient in solubility for forming a film by spin coating. Further, it has been difficult to satisfy the optical characteristics required for the light absorption layer, especially the high refractive index. The optical characteristics of the light absorption layer depend on the extinction coefficient (which means the absorbance per unit film thickness) of the film in the vicinity of the laser light wavelength for recording and reproduction, and satisfy the optical characteristics required for the write-once CD. In order to achieve this, a certain degree of extinction coefficient is required, but in general, a film of a phthalocyanine compound has a smaller extinction coefficient than that of a conventional cyanine dye (about 1/3 to 1/2 of cyanine dye). It depends.

Therefore, it is an object of the present invention to provide an optical recording medium having a light-absorbing layer which has high light fastness and yet has the required optical characteristics, and more specifically a specific optical recording medium having improved optical characteristics and solubility. An object of the present invention is to provide an optical recording medium having a phthalocyanine compound film as a light absorbing layer, and a method for manufacturing the same.

[0006]

As a result of earnest studies, the inventors of the present invention have found that in the above-mentioned conventional optical recording medium, the light absorption layer of the phthalocyanine compound has a small absorption coefficient. The molecule of the compound has a planar structure and is easily molecule-associated, and when the molecule of the phthalocyanine-based compound associates, the light absorption spectrum becomes broad due to the intermolecular interaction, and the solubility in the solvent decreases due to this molecule association. Further, in the phthalocyanine compound, the laser light wavelength range (760-80
In order to obtain an appropriate complex refractive index at 0 nm), it was found that the absorption peak wavelength (λmax) of the light absorption layer is more preferably in the range of 720 to 740 nm, and the present invention was completed.

That is, according to the present invention, in an optical recording medium in which at least a light absorbing layer is provided on a substrate, the light absorbing layer comprises a metal phthalocyanine compound (1) represented by the following general formula (I): Provided is an optical recording medium containing a nitrogen-containing compound (2) selected from an amino compound, an imino compound and an azo compound, which may be substituted or cyclized, as a main component.

[Chemical 1]

[Chemical 2] R ¹ : an alkyl group having 1 to 4 C or an alkoxy group having 1 to 4 C, R ^{2 to} R ⁵ : an alkyl group having 1 to 4 C, an alkoxy group having 1 to 4 C, a halogen atom or a hydrogen atom . )

Further, according to the present invention, in a preferred embodiment, an optical recording medium provided with a light absorption layer using the nitrogen-containing compound (2) containing an N atom in a heterocyclic ring is particularly preferable. An optical recording medium provided with a light absorption layer using at least one selected from imidazole, benzimidazole and thiazole derivatives as the compound (2), and the light absorption layer has a light absorption peak wavelength in the range of 720 to 740 nm. An optical recording medium having (λmax) is provided.

Furthermore, according to the present invention, a metal phthalocyanine compound represented by the above general formula (I) is directly or via another layer on a substrate having information pits and / or guide grooves formed on the surface thereof. A light-absorbing layer containing, as a main component, (1) and a nitrogen-containing compound (2) selected from an optionally substituted or cyclized amino compound, imino compound and azo compound is provided by a coating / deposition means. A method for manufacturing an optical recording medium is provided, in which a light reflecting layer is provided directly thereon or via another layer by a vacuum film forming means, and a protective layer is further provided thereon.

The optical recording medium of the present invention has the above general formula (I).
The metal phthalocyanine compound (1) represented by the formula (1) is provided with a light absorption layer formed of a film in which the nitrogen-containing compound (2) having a function of preventing association of the phthalocyanine compound is coordinate-bonded. Therefore, the molecular association of the phthalocyanine-based compound when the layer is thinned is suppressed, the light absorption spectrum is prevented from becoming broad, and the solubility capable of forming a film by spin coating is maintained. An appropriate complex refractive index can be obtained in the vicinity.

The present invention will be described in detail below. In the optical recording medium of the present invention, the light absorbing layer is selected from the metal phthalocyanine compound (1) represented by the general formula (I) and optionally substituted or cyclized amino compound, imino compound and azo compound. And a nitrogen-containing compound (2) as a main component. That is, in the optical recording medium of the present invention, the metal phthalocyanine compound (1) represented by the general formula (I) is used as the light absorbing layer.
And a nitrogen-containing compound (2) selected from an optionally substituted or cyclized amino compound, imino compound and azo compound are used. In the metal phthalocyanine-based compound (1), the -N = or -N <group in the nitrogen-containing compound is easily coordinated to the central metal M, and the nitrogen-containing compound enters between the molecules of the metal phthalocyanine-based compound. Therefore, the molecular association of the metal phthalocyanine compound can be prevented. Further, as described above, in the metal phthalocyanine-based compound, the absorption peak wavelength (λmax) of the light absorption layer being in the range of 720 to 740 nm is very important for obtaining an appropriate complex refractive index in the vicinity of the laser light wavelength. It was found by the present inventor that it is preferable that the α-position of the phthalocyanine ring (A ¹ , A ² , A ³ ,
Due to the effect of the phenylthio group of A ⁴ , A ⁵ , A ⁶ , A ⁷ , and A ⁸ ), the light absorption layer film has a λmax of approximately 720 to 740 n.
It falls within the range of m, and further has solubility that allows film formation by spin coating.

The nitrogen-containing compound (2) selected from optionally substituted or cyclized amino compounds, imino compounds and azo compounds used in the present invention has -N = in the molecule.
Alternatively, it is a compound having a -N <group. Specific examples thereof include, but are not limited to, the following compounds. Among these, a compound containing an N atom in the heterocycle is preferable because it has a high effect of preventing association of the metal phthalocyanine compound and is excellent in durability (heat resistance and light resistance). Further, from the viewpoint of maintaining the thermal stability of the light absorption layer, the nitrogen-containing compound preferably has a melting point of 150 ° C. or higher. Melting point 15
If the temperature is lower than 0 ° C., the film characteristics (especially optical characteristics) are likely to change in a high temperature environment. Among them, particularly preferable are imidazole, benzimidazole and thiazole derivatives.

N-butylamine, n-hexylamine,
t-butylamine, pyrrole, pyrrolidine, pyridine,
Piperidine, imidazole, benzimidazole, 5,
6-dimethylbenzimidazole, 2,5,6-trimethylbenzimidazole, 2-methylnaphthoimidazole, quinoline, isoquinoline, quinoxaline, benzquinoline, phenanthridine, indoline, carbazole, norharman, benzthiazole, benzoxazole, benztriazole, 7-azaindole, tetrahydroquinoline, triphenylimidazole, benzisoquinoline-5,10-dione, phthalimide, ethylenediamine, triazine, perimidine, 5-chlorotriazole, azobenzene, trimethylamine, N, N
-Dimethylformamide, 1 (2H) phthalazinone, phthalhydrazide, 1,3-diiminoisoindoline, oxazole, polybenzimidazole, polyimidazole, polythiazole and the like.

The metal phthalocyanine compound (1) used in the present invention has a structure represented by the general formula (I), and the central metal M is Mn, Fe, Co,
Zn and Cd can be used. In the phthalocyanine compound (1) having these central metals, the -N = or -N <group in the nitrogen-containing compound (2) is easily coordinated with the central metal, and the effect of preventing association is high. On the other hand, R ^{1 to} R ⁵ of the phenylthio group represented by the following general formula (II) may be the same or different, and R ¹ is an alkyl group having a C number of 1 to 4 or a C number of 1 to 4 is an alkoxy group, and R ^{2 to} R ⁵ are alkyl groups having 1 to 4 C's, and C 1
4 represents an alkoxy group, a halogen atom or a hydrogen atom.

[Chemical 2] R ^{1 to} R ⁵ can improve solubility, extinction coefficient of film, heat resistance and the like. R ¹ and R ⁵ are particularly effective.

The mixing ratio of the nitrogen-containing compound (2) having a group (-N = or -N <group) capable of coordinating to the metal phthalocyanine compound and the metal phthalocyanine compound (1) is The molar ratio of 1/2 to 2/1 [nitrogen-containing compound (2) / metal phthalocyanine compound (1) ratio] is preferable. If the molar ratio is less than 1/2, the effect of the nitrogen-containing compound cannot be sufficiently obtained, and conversely if the molar ratio exceeds 2/1, the dye concentration in the film becomes low, and in any case, the extinction coefficient of the film becomes small.

As the light absorbing layer material, the phthalocyanine compound (1) and the nitrogen-containing compound (2) are used.
In addition to the above, any dye conventionally known as a recording material of an information recording medium can be mixed and used. Examples of such dyes include cyanine dyes, pyrylium-based / thiopyrylium-based dyes, azurenium-based dyes,
Squarylium dyes, metal complex dyes such as Ni and Cr, naphthoquinone / anthraquinone dyes, indophenol dyes, indoaniline dyes, triphenylmethane dyes, triallylmethane dyes, aminium / diimmonium dyes, and Mention may be made of nitroso compounds. Further, if necessary, other third component such as binder, stabilizer and the like can be contained. The thickness of the light absorption layer is preferably 100 to 5000 Å, and particularly preferably 500 to 3000 Å. This is because if the thickness of the light absorbing layer is smaller than this range, the recording sensitivity is lowered, and if it is thicker, the reflectance is lowered.

The substrate used in the present invention can be arbitrarily selected from various materials used as substrates for conventional information recording media. Examples of substrate materials include
Examples thereof include acrylic resins such as polymethylmethacrylate, vinyl chloride resins such as polyvinyl chloride and vinyl chloride copolymer, epoxy resins, polycarbonate resins, amorphous polyolefins, polyesters, glasses such as soda lime glass, and ceramics. In particular, from the viewpoint of dimensional stability, transparency and flatness, polymethyl methacrylate, polycarbonate resin, epoxy resin, amorphous polyolefin, polyester, glass and the like can be mentioned.

On the surface of the substrate on which the light absorption layer is provided,
An undercoat layer may be provided for the purpose of improving flatness, improving adhesive strength, and preventing alteration of the light absorption layer. Examples of the material for the undercoat layer include polymethylmethacrylate, acrylic acid / methacrylic acid copolymer, styrene / maleic anhydride copolymer, polyvinyl alcohol, N-methylolacrylamide, styrene / sulfonic acid copolymer, styrene / Vinyltoluene copolymer, chlorosulfonated polyethylene, nitrocellulose, polyvinyl chloride, chlorinated polyolefin, polyester, polyimide, vinyl acetate /
Vinyl chloride copolymer, ethylene / vinyl acetate copolymer,
Polymer substances such as polyethylene, polypropylene and polycarbonate: Organic substances such as silane coupling agents: and inorganic substances such as inorganic oxides (SiO ₂ , Al ₂ O ₃ etc.) and inorganic fluorides (MgF ₂ ). it can. The layer thickness of the undercoat layer is generally in the range of 0.005 to 20 μm, preferably 0.01 to 10 μm.

Further, a pregroup layer may be provided on the substrate (or undercoat layer) for the purpose of forming a groove for tracking or an unevenness representing information such as an address signal. As the material for the pregroup layer, a mixture of at least one monomer (or oligomer) of acrylic acid monoester, diester, triester, and tetraester and a photopolymerization initiator can be used.

Further, a reflective layer may be provided on the light absorption layer for the purpose of improving the S / N ratio, the reflectance and the sensitivity during recording. The light-reflecting substance that is the material of the reflecting layer is a substance having a high reflectance for laser light, and examples thereof include Mg, Se, Y, Ti, Zr, Hf, V,
Nb, Ta, Cr, Mo, W, Mn, Re, Fe, C
o, Ni, Ru, Rh, Pd, Ir, Pt, Cu, A
g, Au, Zn, Cd, Al, Ca, In, Si, G
Metals and semimetals such as e, Te, Pb, Po, Sn and Si can be mentioned. Among these, preferable ones are Au, Al and Ag. These substances may be used alone or in combination of two or more or as an alloy. The layer thickness of the reflective layer is generally 100 to
It is in the range of 3000Å. Further, the reflective layer may be provided between the substrate and the light absorbing layer, and in this case, recording / reproducing of information is performed from the light absorbing layer side (the side opposite to the substrate).

Further, on the light absorption layer (or reflection layer),
A protective layer may be provided for the purpose of physically and chemically protecting the light absorbing layer and the like. This protective layer may be provided on the side of the substrate where the light absorption layer is not provided for the purpose of enhancing scratch resistance and moisture resistance. Examples of the material used for the protective layer include inorganic substances such as Si, O, SiO ₂ , MgF ₂ , and SnO ₂ , thermoplastic resin, thermosetting resin, and UV curable resin. The layer thickness of the protective layer is generally in the range of 500Å to 50 μm.

Next, a method of manufacturing the optical recording medium of the present invention will be described. The method for producing an optical recording medium of the present invention comprises a metal phthalocyanine compound represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on the surface. A light absorbing layer containing (1) and the nitrogen-containing compound (2) as main components is provided by coating film forming means, and a light reflecting layer is provided thereon by vacuum film forming means directly or via another layer, Further, it is characterized in that a protective layer is provided thereon. That is, the manufacturing method of the present invention comprises the following steps. (A) A metal phthalocyanine compound (1) represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on its surface.
And a step of providing a light absorption layer containing the above-mentioned nitrogen-containing compound (2) as a main component by coating and film formation means, and (b) a vacuum film formation means for forming the light reflection layer directly on the light absorption layer or through another layer. And the step of (c) providing a protective layer on the light absorption layer.

(Light Absorption Layer Forming Step) In the method of the present invention, first, the metal phthalocyanine compound is directly or through another layer formed on a substrate having information pits and / or guide grooves formed on the surface thereof. A light absorption layer containing (1) and the nitrogen-containing compound (2) as main components is provided by a coating and film forming means. That is, the light absorption layer in the present invention comprises a film in which the phthalocyanine compound (1) and the nitrogen-containing compound (2) are coordinate-bonded, and the light absorption layer dissolves the above two compounds to form a liquid state. It can be easily obtained by coating a substrate as a coating liquid. As a solvent for preparing this coating solution, a known organic solvent (for example, alcohol, cellosolve, carbon halide, ketone, ether, etc.) can be used. As the coating method, the spin coating method is preferable because the layer thickness can be controlled by adjusting the concentration and viscosity of the light absorbing layer and the drying temperature of the solvent.

An undercoat layer is provided on the surface of the substrate on the side where the light absorbing layer is provided for the purpose of improving the flatness of the substrate surface, improving the adhesive strength, and preventing the deterioration of the light absorbing layer. . The undercoat layer in this case is prepared by, for example, dissolving or dispersing the above-mentioned undercoat layer substance in a suitable solvent to prepare a coating solution, and then spin-coating, dip-coating the coating solution.
It can be formed by coating the substrate surface by a coating method such as extrusion coating.

(Light-Reflecting Layer Forming Step) In the method of the present invention, a light-reflecting layer is then formed on the light-absorbing layer directly or via another layer by a vacuum film forming means. That is, the light reflecting layer is formed on the light absorbing layer by, for example, vapor deposition, sputtering or ion plating of the above-mentioned light reflecting substance.

(Protective Layer Forming Step) In the method of the present invention, a protective layer is provided on the light reflecting layer. That is, it is formed by vacuum film formation or application film formation of the protective layer material made of the above-mentioned inorganic substance or various resins. In particular, it is preferable to use a UV curable resin, which is formed by spin coating the resin and then irradiating it with ultraviolet rays to cure it.

[0027]

The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 A phthalocyanine dye represented by (A) in Table 1 below and 1
-Tetramethylbenzylbenzimidazole was dissolved in chloroform at a molar ratio of about 1: 1.2 to form a coating solution, which was spin-coated on a glass substrate having a diameter of 120 mm and a thickness of 1.2 mm to provide a light absorbing layer. . The light absorption spectrum of this light absorption layer is shown in FIG. As is clear from FIG. 1, the light absorption spectrum of this light absorption layer had a sharp shape with a high right peak (long wavelength side) of the absorption band.

Comparative Example 1 A light absorbing layer was provided by dissolving a phthalocyanine dye represented by (A) in Table 1 below in chloroform to prepare a coating solution and spin-coating it on a glass substrate having a diameter of 120 mm and a thickness of 1.2 mm. It was The light absorption spectrum of this light absorption layer is shown in FIG. As is apparent from FIG. 1, in the light absorption spectrum of this light absorption layer, the shape of the absorption band was broader than that of the light absorption spectrum of Example 1.

Example 2 An absorbing layer was provided in the same manner as in Example 1 except that the phthalocyanine dye in Example 1 was replaced with the phthalocyanine dye represented by (D) in Table 1 below. The light absorption spectrum of this light absorption layer is shown in FIG. As is clear from FIG. 2, the light absorption spectrum of this light absorption layer had a sharp shape with a high right peak (long wavelength side) of the absorption band.

Comparative Example 2 A light absorbing layer was provided in the same manner as in Comparative Example 1, except that the phthalocyanine dye in Comparative Example 1 was replaced with the phthalocyanine dye represented by (D) in Table 1 below. The light absorption spectrum of this light absorption layer is shown in FIG. As is apparent from FIG. 2, in the light absorption spectrum of this light absorption layer, the shape of the absorption band was broader than that of the light absorption spectrum of Example 2.

Example 3 An absorption layer was provided in the same manner as in Example 1 except that the phthalocyanine dye in Example 1 was replaced with the phthalocyanine dye represented by (G) in Table 1 below. The light absorption spectrum of this light absorption layer is shown in FIG. As is clear from FIG. 3, the light absorption spectrum of this light absorption layer had a sharp shape with a high right peak (long wavelength side) of the absorption band.

Comparative Example 3 An absorbing layer was provided in the same manner as in Comparative Example 1, except that the phthalocyanine dye in Comparative Example 1 was replaced with the phthalocyanine dye represented by (G) in Table 1 below. The light absorption spectrum of this light absorption layer is shown in FIG. As is clear from FIG. 3, in the light absorption spectrum of this light absorption layer, the shape of the absorption band was broader than that of the light absorption spectrum of Example 3.

Examples 4 to 5 and Comparative Examples 4 to 9 The phthalocyanine dyes represented by (A) to (R) in Tables 1 and 2 below and 5,6-dimethylbenzimidazole in a molar ratio of about 1: 2. Was dissolved in chloroform and the light absorption layer was formed in the same manner as in Example 1, and λmax was determined. In addition, the film forming properties of alcohol, cellosolve, and alkane, which are spin-coating solvents for a polycarbonate substrate generally used as an optical disk substrate, were examined. Furthermore,
The heat resistance of the film was determined to be the residual rate of absorption after 200 hours at 120 ° C. [Abs (λmax) 120 ° C., 200 hours / Abs
([Lambda] max) initial stage]. As a result, in the samples (A to L) of the present invention, the light absorption layer had a λmax of 720 to 7
Although it was in the range of 40 nm and could be formed into a film on a polycarbonate substrate with a solvent containing cellosolve (2-ethoxyethanol etc.) or alkane (methylcyclohexane) as a main component, the heat resistance was good, but The samples (M to R) could not satisfy all of the above-mentioned λmax, film formability, and heat resistance.

Example 16 A substrate having a guide groove concavo-convex pattern having a depth of about 1200 Å on the surface of a polycarbonate substrate having a diameter of 120 mm and a thickness of 1.2 mm was prepared, and a dye represented by (C) in Table 1 below was prepared. 5,6-Dimethylbenzimidazole was dissolved in a mixed solvent of ethyl cellosolve / tetrahydrofuran / methylcyclohexane (= 1/1/6) at a molar ratio of 1: 1 and spin-coated to absorb light on the substrate surface. Layers were provided. The film thickness of the light absorption layer was about 1500Å. Approximately 80 Au is deposited on the light absorption layer by Au sputtering.
An optical recording medium of the present invention was produced by providing a reflective layer having a thickness of 0Å and further providing a protective layer made of an ultraviolet curable resin thereon with a thickness of about 5 μm. The obtained optical recording medium has a wavelength of 7
85 nm, N.W. A. An EFM signal was recorded under the conditions of 0.5 and a linear velocity of 1.4 m / s, and the reproduced signal was evaluated.
The op was 69% and the Cl error was 220 or less, which were values satisfying the CD standard.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

According to the optical recording medium of claim 1, the optical recording layer is mainly composed of the metal phthalocyanine compound (1) represented by the general formula (I) and the nitrogen-containing compound (2). Therefore, the molecular association of the phthalocyanine compound is suppressed, and the laser light wavelength range (760 to 800 n
It has excellent optical properties of having an appropriate complex refractive index in m).

In the optical recording medium of claim 2, since the nitrogen-containing compound (2) contains an N atom in the heterocycle, the effect of preventing the molecular association of the phthalocyanine compound is further improved and the durability is improved. The effect of excellent heat resistance and light resistance is added.

In the optical recording medium of claim 3, since at least one selected from imidazole, benzimidazole and thiazole derivatives is used as the nitrogen-containing compound (2), the effect of preventing association of phthalocyanine compounds and The effect of further improving durability is added.

In the optical recording medium of claim 4, since the light absorption peak wavelength of the light absorption layer is in the range of 720 to 740 nm, an appropriate complex refractive index can be more reliably obtained at the laser light wavelength. The effect is added.

In the optical recording medium manufacturing method of the fifth aspect of the present invention, the light absorbing layer is formed by the coating film forming means and the light reflecting layer is formed by the vacuum film forming means. The medium can be easily and stably manufactured.

[Brief description of drawings]

FIG. 1 is a light absorption spectrum diagram of a light absorption layer obtained in Example 1 and Comparative Example 1.

FIG. 2 is a light absorption spectrum diagram of a light absorption layer obtained in Example 2 and Comparative Example 2.

FIG. 3 is a light absorption spectrum diagram of light absorption layers obtained in Example 3 and Comparative Example 3.

Claims (5)

[Claims] 1. An optical recording medium comprising at least a light absorbing layer provided on a substrate, wherein the light absorbing layer has the following general formula (I):
And a nitrogen-containing compound (2) selected from optionally substituted or cyclized amino compounds, imino compounds and azo compounds represented by
An optical recording medium comprising and as main components. [Chemical 1] [Chemical 2] R ¹ : an alkyl group having 1 to 4 C or an alkoxy group having 1 to 4 C, R ^{2 to} R ⁵ : an alkyl group having 1 to 4 C, an alkoxy group having 1 to 4 C, a halogen atom or a hydrogen atom . ) 2. The optical recording medium according to claim 1, wherein the nitrogen-containing compound (2) contains an N atom in a heterocycle. 3. The optical recording medium according to claim 2, wherein the nitrogen-containing compound (2) is at least one selected from imidazole, benzimidazole and thiazole derivatives. 4. The optical recording medium according to claim 1, wherein the light absorption layer has a light absorption peak wavelength (λmax) in a range of 720 to 740 nm. 5. Substitution with a metal phthalocyanine compound (1) represented by the general formula (I) directly or through another layer on a substrate having information pits and / or guide grooves formed on the surface thereof. Alternatively, a light absorbing layer containing a nitrogen-containing compound (2) selected from an optionally cyclized amino compound, imino compound and azo compound as a main component is provided by a coating film forming means, and a light absorbing layer is directly or otherwise provided thereon. 5. The method for producing an optical recording medium according to claim 1, wherein the light reflecting layer is provided by a vacuum film-forming means via the layer of 1 above, and a protective layer is further provided thereon.