JPH08324117A - Optical data recording medium - Google Patents

Abstract

PURPOSE: To obtain an optical data recording material adaptable to a high density optical disk system using semiconductor laser and excellent in light fastness and storage stability, in the optical data recording medium wherein a recording layer, a metal reflecting layer and a protective layer are provided on a substrate, by adding a compd. represented by a specific general formula to the recording layer. CONSTITUTION: In an optical data recording medium adaptable to a high density optical disk using semiconductor layer with an oscillation wavelength of 700nm or less and obtained by providing a recording layer on a substrate directly or through an undercoat layer and providing a metal reflecting layer and a protective layer thereon if necessary, at least one of compds. represented by formulae I-III is added to the recording layer as a main component. In the formula I, R<1> and R<2> are each a 1-6C alkyl group, R<3> is a halogen atom or a nitro group, R<4> in a nitro group or a hydroxy group, n is an integer of 0-4 and X is an acid anion and, in the formula II, Y<1> is an oxygen atom or the like and, in the formula III, R<5> and R<6> are each a 1-6C alkyl group and R<7> is a hydrogen atom or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording medium, and in particular, by irradiating a light beam, an optical change such as transmittance and reflectance is caused in a recording material to record information. The present invention relates to an optical information recording medium that can be reproduced and additionally recorded.

[0002]

2. Description of the Related Art The current write-once optical disc system (WO
RM, CD-R), the oscillation wavelength of the laser used is 770
nm to 790 nm, the recording medium records at the above wavelength,
It is configured to be playable. In the future, it is inevitable that the recording medium will have a large capacity as the amount of information increases, and accordingly, it is also essential to shorten the laser wavelength used for recording and reproduction. As a write-once optical disc for data, many proposals have been made using a cyanine dye or a phthalocyanine dye as a recording material.
At present, a recording material which has excellent storage stability and can be recorded and reproduced by an optical pickup using a laser having a wavelength of 700 nm or less has not yet been developed.

The current CD-R disc system is also configured to be capable of recording and reproducing at the oscillation wavelength of the laser used, that is, 770 nm to 790 nm. In this system, similarly to the above, it is essential to increase the capacity and shorten the laser wavelength. In this respect, current CDs and CD-ROMs are coated with Al on the irregularities of the substrate itself, and the wavelength dependence of the reflectance of Al is small. Therefore, even if the laser wavelength is shortened in the future, reproduction will not be possible. It is possible. However, the CD
-R uses a dye having a maximum absorption wavelength at 690 nm to 730 nm in the recording layer, and has a value of 7 from the optical constant and film thickness constitution.
Since it is set to obtain a high reflectance in the range of 70 nm to 790 nm, the reflectance is extremely low in the wavelength range of 700 nm or less, and it cannot cope with the shortening of the laser wavelength.
The information recorded and reproduced by the D-R system cannot be reproduced by the future system. Until now CD-R
As such, many proposals have been made using a cyanine dye / metal reflective layer, a phthalocyanine dye, an azo metal chelate dye, or the like as a recording material, but a solution to such a point has not yet been found.

[0004]

Therefore, the present invention has been made in view of the above situation, and is a high density optical disc using a semiconductor laser having an oscillation wavelength in a shorter wavelength than the conventional system. A CD that can be applied to a system and is provided with a recording material for an optical information recording medium that is excellent in light resistance and storage stability, and that can be recorded and reproduced by the current system and can be reproduced by a next-generation high-density optical disc system. -The purpose is to provide a recording material for R medium.

[0005]

As a result of intensive studies, the present inventors have made a high-density optical disk system using a semiconductor laser having an oscillation wavelength of 700 nm or less by using a recording layer containing a specific dye as a main component. It was found that this compound is applicable, and further, by using this compound in combination with an organic dye currently used as a recording material for CD-R, 7
They have found that it is possible to obtain a high reflectance even in a wavelength range of 00 nm or less, and have completed the present invention.

That is, according to the present invention, firstly, a recording layer is provided on a substrate directly or via an undercoat layer, and if necessary, a metal reflection layer and a protective layer are provided thereon. In the optical information recording medium, the following general formula (I) is contained in the recording layer.
There is provided an optical information recording medium containing at least one of the compounds represented by (IV) to (IV) as a main component. These compounds have a maximum absorption wavelength in the range of 500 to 670 nm. General formula (I)

Embedded image (In the above formula, R ^{1 to} R ⁴ , n and X represent the following: R ¹ and R ² : each may be the same or different, and may be substituted and have 1 to 6 carbon atoms. group R ^3:. a halogen atom, a nitro group, hydroxy group, a cyano group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group, an alkylamino group or a -SO ₃ H
Basis. R ^4: a nitro group, a halogen atom, hydroxy group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group, a carboxyl group or a -SO ₃ H group. n: an integer of 0 to 4. X: Acid anion. ) General formula (II)

Embedded image (In the above formula, Y ¹ represents an oxygen atom or a sulfur atom. R ¹ ~
R ⁴ , n and X are the same as above. ) General formula (III)

Embedded image (In the above formula, R ^{5 to} R ⁷ represent the following. X is the same as above. R ⁵ and R ⁶ may be the same or different and may be substituted and have 1 to 6 carbon atoms. R ⁷ : hydrogen atom, halogen atom, cyano group, substituted or unsubstituted alkyl group, alkoxy group, alkylthio group or carboxylic acid ester residue.) General formula (IV)

[Chemical 4] (In the above formula, Y ² represents an oxygen atom or a sulfur atom. R ⁵
R ⁷ and X are the same as above. )

Secondly, in the optical information recording medium described in the first item, the recording layer contains at least one compound represented by the general formulas (I) to (IV) and 680 nm to 750 nm.
An optical information recording medium comprising a mixed layer with an organic dye having a maximum absorption wavelength in nm is provided. Thirdly, in the optical information recording medium described in the above second, the optical information recording medium has a wavelength of 680 nm to 750 nm. Provided is an optical information recording medium, wherein the organic dye having the maximum absorption wavelength is at least one of pentamethine cyanine dye, phthalocyanine dye and azo metal chelate dye.

Fourthly, there is provided an optical information recording medium as described in the first item, in which the metal of the metal reflection layer contains at least one of gold, silver and aluminum as a main component. Fifthly, there is provided an optical information recording medium according to the first aspect, wherein the protective layer is made of an ultraviolet curable resin.

Since the optical information recording medium of the present invention is provided with the recording layer containing at least one of the compounds represented by the general formulas (I) to (IV) as a main component, the laser in the wavelength range of 700 nm or less is used. It can be recorded and reproduced by light, and has excellent light resistance and storage stability. Further, at least one compound represented by the general formulas (I) to (IV),
Since a recording layer containing a mixture with an organic dye having a maximum absorption wavelength at 680 to 750 nm as a main component is provided, it can be used as a CD-R in the current system, and even if it becomes a next-generation high-density optical disc system. , It becomes possible to reproduce the described information.

The present invention will be described in detail below. The optical information recording medium of the present invention has, in its recording layer, the above-mentioned general formula (I) to
It is characterized by containing at least one compound represented by (IV) as a main component. The general formulas (I) to (I
In V), R ¹ , R ² , R ⁵ and R ⁶ may be the same or different and each represents an optionally substituted alkyl group having 1 to 6 carbon atoms, preferably 1 to 4 carbon atoms. R ³
Is a halogen atom, nitro group, hydroxy group, cyano group,
A substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group, an alkylamino group or a -SO ₃ H group, R ⁴ is a nitro group, a halogen atom, hydroxy group, a substituted or unsubstituted alkyl group, alkoxy group, alkylthio Represents a group, a carboxyl group or a —SO ₃ H group.
In addition, n represents an integer of 0 to 4. R ⁷ represents a hydrogen atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group or a carboxylic acid ester residue. X is a halogen ion, perhalogenate ion, alkylsulfate anion, PF ₆ anion, BF ₄
Represents an anion, an acid anion such as SbF ₆ anion,
Y ¹ and Y ² represent an oxygen atom and a sulfur atom. R ¹ , R ² ,
When the carbon number of R ⁵ and R ⁶ is 6 or more, the stability (light resistance, storage stability) is extremely reduced.

Specific examples of the compound represented by the general formula (I) or (II) are shown in Table 1 [Table 1- (1) -Table 1- (3)].
Table 2 shows specific examples of the compound represented by formula (III) or (IV).

[0012]

[Table 1- (1)]

[0013]

[Table 1- (2)]

[0014]

[Table 1- (3)]

[0015]

[Table 2]

In the recording layer, as described above, at least one of the compounds represented by the general formulas (I) to (IV) is used.
By using as a main component a mixture of one kind of compound and an organic dye having a maximum absorption wavelength at 680 to 750 nm, it is possible to record / reproduce with the current system and to reproduce only with the next-generation system. It becomes an R recording medium. In this case, as the dye having the maximum absorption wavelength at 680 to 750 nm, pentamethine cyanine dye, phthalocyanine dye and azo metal chelate dye are preferable.

Preferred examples of pentamethine cyanine dyes include those represented by the following general formula (V).

Embedded image In the formula, R ⁸ and R ⁹ are alkyl groups having 1 to 4 carbon atoms, R ¹⁰ is a hydrogen atom, a methyl group or a phenyl group, R ^{11 to} R ¹⁴ are alkyl groups having 1 to 2 carbon atoms, and X is an acid anion. Represent The aromatic ring may be condensed with another aromatic ring.

Preferred examples of the phthalocyanine dye include those represented by the following general formula (VI-1) or (VI-2).

[Chemical 6] [In the formula, M is Al, Ga, In, Si, Ge or Sn.
Represents X may be the same or different from each other, and may have an alkyl group which may have a substituent, an aryl group which may have a substituent, a heterocyclic residue which may have a substituent, Halogen atom, nitro group, cyano group, sulfonic acid group, -OR ²¹ , -SR ²² , -COOR ²³ , -NR
²⁴ R ²⁵ , -SO ₂ NR ²⁶ R ²⁷ , -CONR ²⁸ R ²⁹ , -C
_{^{H 2 NHCOCH 2 NR 30 R 31}} , -NHCOR 32, -N =
It represents a NR ³³ or -N = CHR ^34. R ²¹ , R ²² ,
R ²³ , R ²⁴ , R ²⁵ , R ²⁶ , R ²⁷ , R ²⁸ , R ²⁹ , R ³⁰ and R ³¹ may be the same or different from each other, and have a hydrogen atom or a substituent. Represents an alkyl group, an aryl group, an acyl group, a cycloalkyl group, or a polyether group, and R ²⁶ and R ²⁷ , R ²⁸ and R ²⁹ ,
Alternatively, R ³⁰ and R ³¹ may form a 4- to 7-membered ring, and these 4- to 7-membered ring may be a heterocycle containing a hetero atom such as a nitrogen atom. R ³² , R ³³ and R ^{34, which} may be the same or different, each represents an alkyl group having a substituent, a cycloalkyl group or an aryl group. Z is a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group which may have a substituent, R ³⁵ , R ³⁶ , R ³⁷ , R ³⁸ , R ³⁹ and R ⁴⁰ may be the same or different and may have a substituent, an alkyl group, an aryl group, an acyl group, a cycloalkyl Represents a group, an alkoxy group, an aryloxy group, a polyether group, a hydroxyl group, or a halogen atom. W is O, S, Se
Or represents Te. k, l, m and n each independently represent an integer of 0-8. p represents 0 or 1. ]

[Chemical 7] [In the formula, each R ⁴¹ independently represents a secondary alkyl group having 3 to 20 carbon atoms, and M represents a divalent metal atom or an oxy metal. The substitution positions of the —OR ⁴¹ group are the 1 or 4, 5 or 8, 9 or 12 and 13 or 16 positions. ] The alkoxy phthalocyanine represented by these.

Preferred examples of the azo metal chelate dye include azo metal chelate compounds of an azo compound represented by the following general formula (VII) and a metal.

Embedded image In the formula, A represents a residue which forms a heterocyclic ring together with the carbon atom and nitrogen atom to which it is bonded, and B represents an aromatic ring together with the two carbon atoms to which it is bonded. Or represents a residue forming a heterocycle, and X represents a group having active hydrogen.

In the recording layer, not only the compounds represented by the general formulas (I) to (IV) or the compound and the specific organic dye are mixed, but also the optical characteristics, recording sensitivity and signal characteristics are obtained. It is of course possible to mix or layer with other organic dyes and metals or metal compounds in order to improve the property. In this case, the organic dyes include polymethine dyes, naphthalocyanine dyes, phthalocyanine dyes, squarylium dyes, coroconium dyes, pyrylium dyes, naphthoquinone dyes, anthraquinone (indanthrene) dyes, xanthene dyes, triphenylmethane dyes, azulene dyes, tetrahydro dyes. Examples thereof include choline-based, phenanthrene-based, triphenothiazine-based dyes, and metal complex compounds. Examples of metals and metal compounds include In, Te, and
Bi, In, Se, Sb, Ge, Sn, Al, Be, T
Examples thereof include eO ₂ , SnO, As, and the like, and each of them can be used in the form of dispersion mixing or lamination. Furthermore, for the purpose of improving the properties, stabilizers (for example, transition metal complexes),
It can be used together with a dispersant, a flame retardant, a lubricant, an antistatic agent, a surfactant, a plasticizer and the like. A solvent casting method can be used as the film forming method, and the film thickness is 100Å to 5
μm, preferably 300 Å to 2 μm.

Next, the structure of the recording medium will be described. The structure of the recording medium of the present invention is as shown in FIGS. 1 to 4 as a write-once type optical disk for data, and a sandwich structure in which these two sheets are bonded together may be used. Also,
The structure shown in FIGS. 3 and 4 can be applied to the write-once compact disc. That is, in FIG. 1, the recording layer 2 is provided on the substrate 1, and the metal reflective layer 5 is provided thereon. Figure 2
Is an undercoat layer 3 between the substrate 1 and the recording layer 2 having the structure shown in FIG.
Is provided. FIG. 3 shows the metal reflection layer 5 having the structure shown in FIG.
A protective layer 4 is further provided on the above. Also, FIG.
2 has a structure in which a protective layer 4 is further provided on the metal reflection layer 5 having the structure shown in FIG.

Next, regarding each layer other than the recording layer constituting the recording medium of the present invention, necessary characteristics and examples of constituent materials will be described. <Substrate> A required characteristic of the substrate is that it must be transparent to the laser light used only when recording / reproducing is performed from the substrate side, and need not be transparent when performing recording from the recording layer side. As the substrate material, for example, polyester, acrylic resin, polyamide, polycarbonate resin, polyolefin resin, phenol resin, epoxy resin, plastic such as polyimide, glass, ceramics or metal can be used. In addition, a guide groove or a guide pit for tracking and a preformat such as an address signal may be formed on the surface of the substrate.

<Undercoat Layer> The undercoat layer is (a) improved in adhesiveness, (b) barrier for water or gas, (c) improved storage stability of the recording layer, and (d) improved reflectance. , (E) protection of the substrate from solvent, (f) formation of guide grooves, guide pits, preformats, etc. (A)
For the purpose of using a polymer material, for example, various polymer materials such as ionomer resin, polyamide resin, vinyl resin, natural resin, natural polymer, silicone, liquid rubber and silane coupling agent. Can
For the purposes of (b) and (c), in addition to the above polymeric materials, inorganic compounds such as SiO ₂ , MgF ₂ , SiO,
Metals or semi-metals such as TiO ₂ , ZnO, TiN, SiN, etc., for example Zn, Cu, Ni, Cr, Ge, Se, A
u, Ag, Al or the like can be used. Also,
For the purpose of (d), a metal such as Al or Ag, or an organic thin film having a metallic luster such as a methine dye,
A xanthene dye or the like can be used, and for the purposes of (e) and (f), an ultraviolet curable resin, a thermosetting resin, a thermoplastic resin, or the like can be used. The thickness of the undercoat layer is 0.01 to 30 μm, preferably 0.05 to 1
0 μm is suitable.

<Metal Reflective Layer> The reflective layer may be made of a metal or a semi-metal which has a high reflectance and is not easily corroded. Examples of the material include Au, Ag, Cu, Cr, Ni and Al. However, in terms of reflectance and productivity, Au, A
g and Al are the most preferable. These metals and semimetals may be used alone or as an alloy of two or more kinds. Examples of the film forming method include vapor deposition and sputtering.
The film thickness is 50 to 5000Å, preferably 100 to 3
It is 000Å.

<Protective Layer, Substrate Surface Hard Coat Layer> The protective layer or the substrate surface hard coat layer (a) protects the recording layer (reflection / absorption layer) from scratches, dust, dirt, etc. (b)
It is used for the purpose of improving the storage stability of the recording layer (reflection / absorption layer) and (c) improving the reflectance. For these purposes, the materials shown for the undercoat layer can be used. Further, SiO, SiO _2, etc. can be used as the inorganic material, and polymethyl acrylate, polycarbonate, epoxy resin, polystyrene,
Heat-softening or heat-melting resins such as polyester resin, vinyl resin, cellulose, aliphatic hydrocarbon resin, aromatic hydrocarbon resin, natural rubber, styrene butadiene resin, chloroprene rubber, wax, alkyd resin, drying fat, rosin, etc. Can be used. Among the above materials, the most preferable material for the protective layer or the substrate surface hard coat layer is an ultraviolet curable resin having excellent productivity. The thickness of the protective layer or the hard coat layer on the substrate surface is 0.01 to 30 μm, preferably 0.05 to 10 μm. In the present invention,
The undercoat layer, the protective layer, and the substrate surface hard coat layer, as in the case of the recording layer, a stabilizer, a dispersant, a flame retardant,
An antistatic agent, a surfactant, a plasticizer, etc. can be contained.

[0026]

The present invention will be described below in detail with reference to examples.

Example 1 A compound specific example No. was formed on a substrate having a guide groove having a depth of 1200 L, a half-value width of 0.4 μm and a track pitch of 1.4 μm formed on a PMMA plate having a thickness of 1.2 mm by photopolymer. ． A 1,2-dichloroethane solution of 3 (maximum absorption wavelength: 648 nm) was applied by spinner to form a recording layer having a thickness of 800 Å to obtain a recording medium.

Examples 2 to 8 Specific examples of compounds in Example 1 No. 3 instead of Compound Specific Example No. 3, respectively. 5 (Maximum absorption wavelength: 635n
m), compound example No. 8 (Maximum absorption wavelength: 643n
m), compound example No. 10 (Maximum absorption wavelength: 648
nm), compound specific example No. 24 (Maximum absorption wavelength: 63
9 nm), compound specific example No. 25 (Maximum absorption wavelength: 6
45 nm), compound specific example No. 48 (Maximum absorption wavelength:
640 nm), compound specific example No. A recording medium was formed in the same manner as in Example 1 except that 54 (maximum absorption wavelength: 650 nm) was used.

Comparative Example 1 Specific compound No. 1 in Example 1 A recording medium for comparison was formed in the same manner as in Example 1 except that the compound (formula VIII) shown below was used in place of 3.

[Chemical 9]

<Evaluation> The recording media of Examples 1 to 8 and Comparative Example 1 manufactured as described above were evaluated for reflectance and recording and reproducing characteristics, including a light resistance test and a storage test. The results are shown in Table 3. <Measurement method> Recording conditions Laser oscillation wavelength: 680 nm Recording frequency: 1.25 MHz Recording linear velocity: 1.2 m / sec Reproduction conditions Laser oscillation wavelength: 680 nm Reproduction power: 0.25 to 03 mW continuous light scanning band width: 30 KHz Weather resistance Test conditions Light resistance test: 40,000 Lux, Xe light, 50 hours continuous irradiation Storage test: 85 ° C, 85% RH, left for 720 hours

[0031]

[Table 3]

Example 9 Depth 1000Å, Half-Width Width 0.4 μm, Pitch 1.6 μm
On the 1.2 mm thick injection-molded polycarbonate substrate having the guide groove of Example, the compound No. 1, 2, 2, 3,
3-Tetrafluoropropanol solution is applied by spinner to form an organic dye layer with a thickness of 1600Å, then a reflective layer of gold with a thickness of 2000Å is formed by a sputtering method, and an acrylic photopolymer with a thickness of 2 μm is formed on the reflective layer. A layer was provided to make a recording medium.

Examples 10 to 16 Specific examples of compounds in Example 9 1 instead of compound specific example No. 1. 4, no. 16, No. Three
1, No. 42, No. 47, No. 50, No. 55
A recording medium was formed in the same manner as in Example 9 except that was used.

Comparative Example 2 As the organic thin film in Example 9, the compound specific example No.
A recording medium for comparison was formed in the same manner as in Example 9 except that the compound represented by the formula (VIII) was used in place of 1.

<Evaluation> The recording media of Examples 9 to 16 and Comparative Example 2 manufactured as described above were evaluated for reflectance and recording and reproducing characteristics. The results are shown in Table 4. <Measurement method> A semiconductor laser having an oscillation wavelength of 680 nm and a beam diameter of 1.4 μm was recorded on this recording medium, and an EFM signal was recorded while tracking (linear velocity 1.4 m / sec).
The reproduced waveform was observed by reproducing with the continuous light of the same laser.

[0036]

[Table 4]

Example 17 Depth 1000Å, Half Width 0.45 μm, Pitch 1.6 μ
m of a 1.2 mm-thick injection-molded polycarbonate substrate having a guide groove of m. 3 and 2 are the weight ratio (1/1) of 2, 2,
3,3-Tetrafluoropropanol solution is applied by spinner to form an organic dye layer with a thickness of 1600Å, and then a reflective layer of gold with a thickness of 2000Å is formed by a sputtering method. A protective layer of No. 1 was provided to obtain a recording medium.

Examples 18 to 23 Specific examples of compounds in the recording layer of Example 17 No. 3 instead of Compound Specific Example No. 3, respectively. 10, No. 1
9, No. 23, No. 41, No. 48, No. 54
A recording medium was formed in the same manner as in Example 17 except that was used.

Comparative Example 3 A recording medium for comparison was formed in the same manner as in Example 9 except that the compound represented by the following formula (IX) was used as the organic thin film in Example 9.

[Chemical 10]

<Evaluation> The recording media of Examples 17 to 23 and Comparative Example 3 produced as described above were evaluated for reflectance and recording and reproducing characteristics. The results are shown in Table 5. <Measurement Method> An EFM signal was recorded while tracking using a semiconductor laser having an oscillation wavelength of 780 nm and a beam diameter of 1.6 μm on this recording medium (linear velocity 1.4 m / sec).
Same laser and oscillation wavelength 680nm, beam diameter 1.4μ
The reproduced waveform was observed by reproducing with continuous light of a semiconductor laser of m.

[0041]

[Table 5]

[0042]

According to the optical information recording medium of claim 1, since the recording layer containing at least one of the compounds represented by the general formulas (I) to (IV) as a main component is provided, a wavelength of 700 nm or less is obtained. Recording and reproduction are possible with the laser light in the range, and it has excellent light resistance and storage stability.

In the optical information recording medium of claim 2, the recording layer is a mixture of at least one of the compounds represented by the general formulas (I) to (IV) and an organic dye having a maximum absorption wavelength at 680 nm to 750 nm. Since it is composed of layers, it can be used as a CD-R in the current system, and even if it becomes a next-generation high-density optical disc system, it becomes possible to reproduce the recorded information.

An optical information recording medium according to a third aspect is the 680.
Since the organic dye having the maximum absorption wavelength in nm to 750 nm is at least one of pentamethine cyanine dye, phthalocyanine dye, and azo metal chelate dye, high-quality signal characteristics can be recorded.

In the optical information recording medium according to claim 4, since the metal of the metal reflective layer contains at least one of gold, silver and aluminum as a main component, it is possible to improve the productivity and the reflectivity of the CD. -R media conversion is possible.

In the optical information recording medium according to the fifth aspect, since the protective layer is made of the ultraviolet curable resin, it is possible to form the protective layer medium with good productivity.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a recording medium of the present invention.

FIG. 2 is a schematic cross-sectional view showing another example of the recording medium of the present invention.

FIG. 3 is a schematic sectional view showing still another example of the recording medium of the present invention.

FIG. 4 is a schematic sectional view showing still another example of the recording medium of the present invention.

[Explanation of symbols]

 1 Substrate 2 Recording layer 3 Undercoat layer 4 Protective layer 5 Metal reflective layer

Claims (5)

[Claims] 1. An optical information recording medium in which a recording layer is provided on a substrate directly or via an undercoating layer, and if necessary, a metal reflective layer and a protective layer are provided on the recording layer. An optical information recording medium containing at least one of the compounds represented by the following general formulas (I) to (IV) as a main component. General formula (I) (In the above formula, R ^{1 to} R ⁴ , n and X represent the following: R ¹ and R ² : each may be the same or different, and may be substituted and have 1 to 6 carbon atoms. group R ^3:. a halogen atom, a nitro group, hydroxy group, a cyano group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group, an alkylamino group or a -SO ₃ H
Basis. R ^4: a nitro group, a halogen atom, hydroxy group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group, a carboxyl group or a -SO ₃ H group. n: an integer of 0 to 4. X: Acid anion. ) General formula (II): (In the above formula, Y ¹ represents an oxygen atom or a sulfur atom. R ¹ ~
R ⁴ , n and X are the same as above. ) General formula (III): (In the above formula, R ^{5 to} R ⁷ represent the following. X is the same as above. R ⁵ and R ⁶ may be the same or different and may be substituted and have 1 to 6 carbon atoms. R ^{7 is a} hydrogen atom, a halogen atom, a cyano group, a substituted or unsubstituted alkyl group, an alkoxy group, an alkylthio group or a carboxylic acid ester residue.) General formula (IV) embedded image (In the above formula, Y ² represents an oxygen atom or a sulfur atom. R ⁵
R ⁷ and X are the same as above. ) 2. The recording layer has the general formulas (I) to (IV).
At least one compound represented by: and 680 nm to 75
The optical information recording medium according to claim 1, wherein the optical information recording medium comprises a mixed layer with an organic dye having a maximum absorption wavelength at 0 nm. 3. An organic dye having a maximum absorption wavelength in the range of 680 nm to 750 nm is a pentamethine cyanine dye,
The optical information recording medium according to claim 2, which is at least one of a phthalocyanine dye and an azo metal chelate dye. 4. The optical information recording medium according to claim 1, wherein the metal of the metal reflection layer contains at least one of gold, silver and aluminum as a main component. 5. The optical information recording medium according to claim 1, wherein the protective layer is made of an ultraviolet curable resin.