JPH0585057A - Data recording medium - Google Patents

Abstract

PURPOSE:To improve repeated reading capacity by laminating a light absorbing layer containing a specific cyanine dye and a quencher and a light reflecting layer to a light perspective substrate having pre-grooves formed to the single flat surface thereof. CONSTITUTION:A data recording medium 1 is formed by successively laminating a light absorbing layer 12, a light reflecting layer 13 and a protective layer 14 to a light pervious substrate 11. The light absorbing layer 12 provided on the substrate 11 contains a first cyanine dye having a light absorbing band within the wavelength region of recording light or regenerating light, a second cyanine dye having a light absorbing band on a wavelength side shorter than that of the first cyanine dye and low in light absorption within the wavelength region of recording light or regenerating light, a first quencher for preventing the light deterioration of the cyanine dyes and a second quencher composed of a diphenylamine compound and is provided by spin coating. The light reflecting layer 13 is formed by the vacuum vapor deposition, sputtering or ion plating of a metal such as Au, Ag, Cu or Al.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writable information recording medium, and more particularly to an information recording medium having a light absorbing layer and a light reflecting layer on a light transmitting substrate.

[0002]

2. Description of the Related Art Conventionally, it is generally well known that organic dyes such as cyanine and phthalocyanine dyes are used for recording films of so-called writable information recording media.

As a method of writing on such an information recording medium, a laser beam is focused on a very small area of the recording film, converted into heat energy, and the properties of the recording film are changed (pit formation). ing. In order to smoothly change the properties of the recording film, the medium may have a so-called air sandwich structure in which two recording films are provided on a substrate and the recording films are arranged to face each other. It is common.

A writing laser beam used in such a type of information recording medium is irradiated from the transparent substrate side to form an optically readable pit in the recording film. The reading laser beam for reproducing the recorded data has a weaker output than that for writing, and the contrast between the portion where the pits are formed and the portion where the pits are not formed is read as an electric signal.

On the other hand, unlike the above-mentioned medium, a so-called ROM (read only memor) in which data is already recorded in advance.
There is also a y) type medium, which has been widely put to practical use in the fields of voice recording and information processing. However, this does not have a writable recording film as described above. That is, the pre-pits corresponding to the data to be reproduced are already formed by press molding on the plastic substrate, the reflective layer made of metal such as Au, Ag, Cu, Al is formed on the plastic substrate, and the protective layer is further formed thereon. Layers have been formed. A typical medium of this ROM type is a compact disc called a so-called CD. The specifications of the recording and reading signals of this CD have been standardized, and in accordance with this standard, a CD reproducing device is widely used as a compact disc player (CD player).

The writable information recording medium is similar to a CD in that a laser beam is used, and is similar to a CD in that the form of the medium is a disc shape. Therefore, there is a strong demand for the development of a writable medium that conforms to the CD specification standard and can be used as it is for a CD player, and actual samples are being presented to meet this demand.

[0007]

However, although such an actual sample clears the standard in its initial characteristics, there is a problem that the so-called large jitter has a weak light resistance of the recording film which is weak against repeated reading and the recording sensitivity cannot be controlled. The present invention was conceived in view of such circumstances, and its purpose is to reduce so-called jitter, improve repetitive read performance and light resistance of a recording film, and control writable write sensitivity. It is to provide an information recording medium.

[0008]

In order to solve the above-mentioned problems, the present invention has a light-absorbing layer on a light-transmissive substrate having a pre-groove formed on one side plane, and a light-absorbing layer is provided on the light-absorbing layer. In the information recording medium having a reflective layer, the light absorption layer, a first cyanine dye having a light absorption band in the wavelength range of the recording light or the reproduction light, and on the shorter wavelength side than the first cyanine dye. A second cyanine dye having a light absorption band and having a small light absorption in the wavelength range of recording light or reproducing light, and a first quencher for preventing photodegradation of the cyanine dye,
A second quencher of a diphenylamine compound, wherein the weight ratio of the second cyanine dye to the first cyanine dye is α, the weight ratio of the first quencher to the second quencher is β, and the first cyanine When the ratio of the added weight of the first quencher and the second quencher to the added weight of the system dye and the second cyanine dye is γ, α
= 1 to 3, β = 0.5 to 1, γ = 0.25 to 0.5, α
It was made to contain so as to satisfy the condition of γ <1.1.

FIG. 1 is a schematic perspective view in which a part of the information recording medium of the present invention is cut away. Information recording medium 1 of the present invention
Has a light absorbing layer 12 formed on a light transmissive substrate 11,
A light reflecting layer 13 is provided on the light absorbing layer 12, and a protective layer 14 is provided on the light reflecting layer 13.

Light absorbing layer 12 formed on substrate 11.
Is a first cyanine dye having a light absorption band in the wavelength range of recording light or reproducing light, and a light absorption band on the shorter wavelength side than the first cyanine dye, and It contains a second cyanine dye having a small light absorption in the wavelength region, a first quencher for preventing photodegradation of the cyanine dye, and a second quencher of a diphenylamine compound.

In the present invention, the wavelength range of the recording light or the reproducing light is, for example, the wavelength range of 770 to 830 nm, and thus the first cyanine dye is represented by the following general formula [I]. A cyanine dye is used.

[0012]

[Chemical 5] In the above general formula [I], R ₁ and R ₂ each represent an alkyl group having 1 to 8 carbon atoms, preferably an alkyl group having 3 to 5 carbon atoms. When the carbon number exceeds 8, deterioration is accelerated in the high temperature and high humidity test. In addition, there is an inconvenience that waxing occurs and handling becomes inconvenient.

X ⁻ represents a counter ion, and specific examples thereof include ClO ₄ ⁻ , I ⁻ , Br ^{− and the} like. on the other hand,
As the second cyanine dye, a cyanine dye represented by the following general formula [II] is used.

[0014]

[Chemical 6] In the above general formula [II], R ₃ and R ₄ each represent an alkyl group having 1 to 8 carbon atoms, preferably an alkyl group having 3 to 5 carbon atoms. If the carbon number exceeds 8, the same inconvenience as in the case of the above general formula [I] occurs. X ⁻ represents a counter ion and has the same meaning as above.

Further, the light absorption layer 12 contains a first quencher for preventing the photodegradation of the cyanine dye. A metal complex is effective as the first quencher, and for example, N represented by the following general formula [III] is used.
i-complexes are preferred.

[0016]

[Chemical 7] In the formula, R ₅ , R ₆ , R ₇ and R ₈ each represent hydrogen or a substituent in place of hydrogen.

As a substituent, CH ₃ O--, CH ₃ OC
_{H 2 CH 2 O-, CH 3} COO -, (n-C 3 H 7) 2
_{N -, (C 2 H 5} ) 2 N-, Cl- , and the like.

Specific examples of such a first quencher include those having the following structural formulas [Q-1] to [Q-4].

[0019]

[Chemical 8]

[0020]

[Chemical 9]

[0021]

[Chemical 10]

[0022]

[Chemical 11] Among these quenchers, the one represented by the structural formula [Q-1] is particularly preferable from the viewpoint of preventing photodegradation of the cyanine dye.

The light absorbing layer 12 of the present invention further contains a second quencher in addition to the above first quencher. The second quencher is a diphenylamine compound represented by the following general formula [IV]. This second quencher is contained in order to prevent the structure of the cyanine dye from being destroyed by recording, that is, forming pits, and to prevent the deterioration of the compound constituting the portion of the decomposition residue with light.

[0024]

[Chemical formula 12] In this formula, R ₉ , R ₁₀ , and R ₁₁ each represent hydrogen, a nitroso group, a substituted or unsubstituted amino group, or a substituted or unsubstituted aryl group. Among them, the wavelength of the light absorption peak is 400 to 500 at which the cyanine reaction residue has absorption.
A diphenylamine compound of nm is particularly preferable, and specific examples thereof include those represented by the following structural formulas [A-1] to [A-3]. When the wavelength of the light absorption peak is out of the above range, particularly when it exceeds 500 nm, there is a possibility that absorption at the recording wavelength starts and the overall characteristics of recording and reproduction are changed. Further, if it is less than 400 nm, it is a mere ultraviolet absorber, and it matches the short-wavelength absorption of the dye, so there is no point in adding it.

[0025]

[Chemical 13]

[0026]

[Chemical 14]

[0027]

[Chemical 15] In the present invention, the content ratio of the first cyanine dye, the second cyanine dye, the first quencher, and the second quencher of the diphenylamine compound is contained so as to satisfy the following conditions. .. That is, the weight ratio of the second cyanine dye to the first cyanine dye is α, the weight ratio of the first quencher to the second quencher is β, the first cyanine dye and the second cyanine dye, When the ratio of the added weight of the first quencher to the added weight of the second quencher is γ, α = 1 to 3 β = 0.5 to 1 γ = 0.25 to 0.5 α · γ < It is contained so as to satisfy the condition of 1.1.

If these conditions are not satisfied, the reflectivity is lowered in the laser wavelength range of the reproduction light. In addition, the recording sensitivity is lowered during recording, and the recording power is increased. Also,
There is an inconvenience that the photodegradation due to the reproduction light and the photodegradation in the wavelength region other than the reproduction light are promoted.

The light absorbing layer 12 containing such a cyanine dye and a quencher is applied by a conventional means such as a spin coating method, and upon application, the first cyanine dye and the second cyanine dye are applied. If the concentration of the mixed solution with the cyanine dye becomes too low, the absorption sensitivity will decrease and the signal will not be recorded by the semiconductor laser.On the contrary, if the concentration is too high, the dye will be difficult to dissolve in the solvent. Inconvenience occurs.

The thickness of the applied light absorbing layer 12 is 30 to
It is 900 nm, preferably 100 to 300 nm.
If this value is less than 30 nm, the absorption will be small and the sensitivity in the wavelength region of the semiconductor laser will be lowered, resulting in an inconvenience that a signal cannot be recorded. As a result, there arises a disadvantage that the reflectance decreases.

As the solvent used for coating, various known solvents can be used, and examples thereof include diacetone alcohol, ethyl cellosolve, methyl cellosolve, isophorone, methanol and tetrafluoropropanol.

As shown in FIG. 3, pregrooves 70 for tracking are formed in a concentric or spiral shape on the one-sided plane of the light transmitting substrate 11 on which the light absorbing layer 12 is coated. ing.

The pregroove 70 has a groove depth h of λ.
/6.5n to λ / 2.5n, more preferably λ / 4.7.
It is preferable to form it so that it is n to λ / 3.6n. here
, Λ is the wavelength (nm) of recording light or reproducing light, and n is the substrate
Represents the refractive index of. The value of the groove depth h is λ / 6.5n
If it is less than this, crosstalk will increase and CD play will occur.
The so-called 3-beam tiger required for stable reproduction
Locking error (TE _3b) Becomes smaller
And the groove depth h exceeds λ / 2.5n
And the amount of dye applied to the groove increases and absorption increases.
Causes the disadvantage that the required reflectance decreases.
Occurs.

Incidentally, the wavelength of the recording light or the reproducing light which is usually used is 770 to 830 nm. Further, the pre-groove 70 has a groove width W of 0.35 to 0.47.
μm, and more preferably 0.37 to 0.45 μm. When the value of the groove width W is less than 0.35 μm, push-pull tracking error (TE _PP ) is reduced, and recording sensitivity and recording amplitude are disadvantageously reduced. In addition, the value of the groove width W is 0.47μ
If it exceeds m, the value of TE _PP decreases and crosstalk increases, which is a disadvantage. The pre-group 70
As shown in FIG. 3, the cross section of the groove has a generally trapezoidal shape. Therefore, the groove width W in the present invention is a width (μm) at a position half the groove depth h, that is, at a position of h / 2. Is defined by

From the viewpoint of improving productivity, it is preferable to use a so-called integrally formed injection-molded resin substrate as the substrate 11 having such a pre-groove 70, which is, for example, a polycarbonate resin (PC). , A transparent material such as polymethylmethacrylate resin (PMMA). Particularly, the average molecular weight of 32,000 to 40,000
It is preferable to use the polycarbonate resin (PC). Further, the substrate is not limited to the injection-molded resin substrate integrally formed, and may be a substrate formed by a so-called 2P (photo-polymer) method. The thickness of such a substrate 11 is 1.0 to
It is about 1.5 mm.

Light absorbing layer 1 coated on the substrate 11
A light reflection layer 13 is provided on the second layer 2. Light reflection layer 13
Is composed of a metal such as Au, Ag, Cu, Al, etc., which is formed by vacuum evaporation, sputtering, ion plating or the like. The thickness of the light reflection layer 13 is
It is set to about 0.02 to 2.0 μm.

The light absorption layer 1 is usually provided on the light reflection layer 13.
A protection layer 14 is provided to protect the light reflection layer 2 and the light reflection layer 13. The protective layer 14 is generally formed by spin-coating an ultraviolet curable resin and applying it, and then irradiating it with ultraviolet rays to cure the coating film. In addition, epoxy resin, acrylic resin, silicone resin, urethane resin or the like is used as the material of the protective layer 14. The thickness of the protective layer 14 is
Usually, it is about 0.1 to 100 μm.

An intermediate layer for protecting the substrate 11 from the solvent may be provided between the substrate 11 and the light absorption layer 12. Further, an intermediate layer may be provided between the light absorption layer 12 and the light reflection layer 13 for increasing the efficiency of light absorption.

[0039]

EXAMPLES The present invention will be described in more detail with reference to specific examples. As the first cyanine dye and the second cyanine dye contained in the light absorption layer, [D-1] and [D-2] shown below are used as the first quencher, and the above [Q-1 ] And [A-1] above as the second quencher.

The first cyanine dye [D-1] In the formula [I], R ₁ and R ₂ each _{n-C 4 H 9, X} - a ClO ₄ ^- was.

[0041] In a second cyanine dye [D-2] above general formula [II], R ₃ and R ₄ each _{n-C 3 H 7, X} - was ^- a I.

Each of these dyes and quenchers was dissolved in a solvent of ethyl cellosolve, and the resulting solution was diluted to a diameter of 1
25 on a 20mm, 1.2mm thick polycarbonate substrate
It was applied to a thickness of 0 nm. The substrate used had spiral grooves formed in advance by injection molding. On the light absorption layer, a light reflection layer made of Au was further formed to a thickness of 0.1 μm by a vacuum evaporation method. Further, a photopolymer protective film was formed on the light absorbing layer to prepare an information recording medium sample. When making a sample,
Various information recording medium samples were produced by changing various combinations of the first cyanine dye, the second cyanine dye, the first quencher, and the second quencher.

With respect to each of these samples, the power of the recording light that actually enables recording was measured. The results are shown in Table 1 below.
Shown in. In Table 1, the mixing ratios are α, β,
Converted to γ and α / γ values.

[0044]

[Table 1] From the results of the recording power in Table 1, the sample of the present invention can perform stable recording, and the recording sensitivity can be controlled by adjusting the content ratio of the first cyanine dye and the second cyanine dye. You can

Next, the repeated read performance test was conducted in the following manner. That is, as the sample of the present invention, the sample No. 1 was used. As Comparative Sample 1, the sample of the present invention (Sample No. 1 in Table 1).
The first quencher in 1) was changed to the quencher represented by the structural formula [Q *] below. As Comparative Sample 2, the first quencher of the sample of the present invention (Sample No. 1) was not used. As a comparative sample 3, another company's sample was used.

[0046]

[Chemical 16]Repeated read time for these samples
I_topValue and I ₃Measures changes in value and jitter over time
Decided The results are shown in FIGS. 4, 5 and 6. these
The results show that the present invention shows extremely repetitive read performance.
It turns out that it is excellent.

Next, a light resistance test was conducted in the following manner. That is, as the sample of the present invention, the sample No. 1 was used. As a comparative sample, the second quencher of the sample of the present invention (Sample No. 1) was excluded, and the weight ratio α of the first cyanine dye [D-1] and the second cyanine dye [D-2] was Is set to 3, and the first quencher [Q-1] is set to the above [D-1] and [D-2].
1/6 of the added weight of.

A light exposure test was conducted on these samples in the following manner. Light exposure test An FL tube having a spectrum extremely close to that of sunlight and a UV tube for emitting ultraviolet light were placed in close proximity to each other, and a disk sample was placed 15 cm immediately below the UV tube for testing. About 20
It is 000 lx (lux). Evaluation is Block Error Rate
Went by. The test results are shown in FIG. FIG. 7 is a graph showing the relationship between the elapsed time and the error rate, where the white circles represent the samples of the present invention and the black circles represent the comparative samples. From this graph, it can be seen that the present invention does not increase the error rate over time and is extremely excellent in light resistance.

Further, the light exposure test was conducted on the recording media having the light absorbing layer samples 1 to 4 shown in Table 1 in the same manner as described above. The results are shown in Fig. 8. From this graph, the light resistance becomes poor when the compounding ratio of the cyanine dye and the quencher constituting the light absorption layer is out of the range of the present invention, on the other hand, those within the range of the present invention have excellent light resistance. Recognize.

Furthermore, the sample of the present invention used in the above-mentioned repeated read performance test (Sample No. 1 in Table 1)
If, comparative sample 1 for the (first quencher to the structural formula of sample No.1 [Q *] in what was changed to quencher represented), under conditions similar to the light exposure test, I _l (Land The electric potential of I _g (the electric potential of the groove) and the potential of I _g (the electric potential of the groove) and the change with time were examined. The results are shown in Fig. 9. According to this graph, the samples of the present invention have I _l , I
_It can be seen that both the _g potential is high, the change with time due to light exposure is extremely small, and the light resistance is excellent.

Next, in order to investigate the influence of the groove width W of the pre-groove, one substrate having various groove widths (diameter 120 mm, thickness 1.2) as shown in Table 2 below is used.
mm polycarbonate substrate) was prepared. Band No.
Becomes larger, the groove is located outside the substrate.

[0052]

[Table 2] The groove width W is the groove depth h as described above.
Width at half the position of h / 2, that is, at the position of h / 2 (μ
m). Groove width W and groove depth h
Are respectively coordinate measurement scanning electron microscopes (EMM-30
00: manufactured by Elionix Co., Ltd.).

A light absorbing layer containing a cyanine dye and a quencher was coated on this substrate. That is, the sample No. of Table 1 above. Each of the dye and the quencher was dissolved in a solvent of ethyl cellosolve so as to have a composition shown by 1, and this was coated on a substrate to a thickness of 250 nm. A light reflecting layer made of Au was further formed on the light absorbing layer by a vacuum vapor deposition method to a thickness of 0.1 μm. Further, a photopolymer protective film was formed on the light reflection layer to prepare an information recording medium sample.

EFM signals were recorded and reproduced on the various medium samples produced under the above conditions under the following conditions. EFM signal recording conditions Wavelength: 778 nm Linear velocity: 1.4 m / s Write power: 6.0 mW Read power: 0.5 mW For the medium recorded under the above conditions, the land potential I _l ,
Groove portion potential Ig, potential I _top of the brightest part of 11T (196 kHz) amplitude of the recording signal among the recording signal 11T (1
96 KHz) amplitude potential I _11T , 3T of recording signal (720 KHz) amplitude potential I _3T , push-pull tracking error potential T
E _pp and 3 beam tracking error potential TE _3b were measured.

The measurement results are shown in FIGS. Figure 1
0 is a graph showing changes in the land potential I _l and the groove part potential I _g , FIG. 11 is a graph showing changes in the push-pull tracking error potential TE _pp before and after recording, and FIG. FIG. 13 is a graph showing the potential change of the 3-beam tracking error potential TE _3b .
₆ is a graph showing potential changes of _top , I _11T , and I _3T .

In order to evaluate each sample from the results shown in these graphs, in order to make the reproduced signal conform to the CD format, it is necessary that I _l > I _g in the relation of I _l and I _g. Is.

Push-pull tracking error potential T
E _pp needs to be 0.04 V or more. This is because the tracking servo is stably applied and recording is surely performed.

Three-beam tracking error potential TE _3b
Is required to be at least 2.5 V, which is the same level as TE _{3b of} a commercial CD. This is for stably reproducing the recording signal (pit) on the CD player.

I_top, I_11T, And I_3TIn the relationship
I_topIs above the reflectance of 65%.
Under the recording and reproducing conditions of, 0.45V or more is required._11T
/ I _topIs 60% or more, I_3T/ I_topIs 30
% Or more and 70% or less is required. Enough anti
This is because the emissivity is taken and the modulation degree is made large.

From the graphs of FIGS. 10 to 13, the band No. is shown to satisfy all of these evaluation conditions.
It can be seen that it is 8 to 11 (groove width W = 0.35 to 0.47 μm).

Next, the groove width W of the pre-groove provided on the substrate is fixed to 0.44 μm, and the groove depth h
Λ / 7.0n to λ / 3.8n angstrom ()
And the influence of the groove depth h was investigated. In preparing the sample, the light absorbing layer, the light reflecting layer, and the protective film were the same as those used for examining the influence of the groove width W, and an information recording medium sample was prepared.

The measurement results are shown in FIGS. Figure 1
4 is a graph showing potential changes in the mirror surface potential I _o and the groove portion potential Ig (need to be I _o > I _g ), and FIG. 15 is a graph showing changes in the push-pull tracking error potential TE _pp. And FIG. 16 shows I _top ,
FIG. 17 is a graph showing potential changes of I _11T and I _3T , and FIG. 17 is a graph showing potential changes of the three-beam tracking error potential TE _3b .

From each of the graphs of FIGS. 14 to 17, when the groove width W is fixed to 0.44 μm, λ / 4.5n to λ / 3.8 can satisfy all the above evaluation conditions.
n (where λ is the wavelength (nm) of the recording light or the reproducing light,
It can be seen that n is in the range of (representing the refractive index of the substrate). The groove width W is 0.35 to 0.47 μm.
The same experiment as described above was carried out by changing the above to the groove depth, and it was confirmed that good results were obtained in the range of the groove depth λ / 6.5n to λ / 2.5n.

[0064]

The light absorbing layer of the present invention comprises a first cyanine dye having a light absorption band in the wavelength region of recording light or reproducing light, and a light absorption region shorter in wavelength than the first cyanine dye. A second cyanine dye having a band and having small light absorption in the wavelength range of recording light or reproducing light, a first quencher for preventing photodegradation of the cyanine dye, and a second quencher of diphenylamine compound. And the weight ratio of the second cyanine dye to the first cyanine dye is α, the weight ratio of the first quencher to the second quencher is β, the first cyanine dye and the second cyanine When the ratio of the added weight of the first quencher and the second quencher to the added weight of the system dye is γ, α = 1 to 3,
β = 0.5 to 1, γ = 0.25 to 0.5, α · γ <1.
Since it is contained so as to satisfy the condition 1, it is possible to provide a writable information recording medium in which the jitter is reduced, the repetitive reading performance and the light resistance of the recording film are improved, and the recording sensitivity can be controlled. ..

[Brief description of drawings]

FIG. 1 is a schematic perspective view in which a part of an optical recording medium of the present invention is cut away.

FIG. 2 is a partially enlarged sectional view of a cutout portion of FIG.

FIG. 3 is an enlarged cross-sectional view of a substrate, particularly a pre-groove.

FIG. 4 is a graph showing changes in I _top value over time with respect to repeated read time.

FIG. 5 is a graph showing changes over time of I ₃ values with respect to repeated read times.

FIG. 6 is a graph showing changes in jitter over time with respect to repeated read time.

FIG. 7 is a graph showing the relationship between light exposure time and error rate.

FIG. 8 is a graph showing the relationship between light exposure time and error rate.

FIG. 9 is a graph showing a relationship between a light exposure time and a land portion potential I ₁ and a groove portion potential I _g .

FIG. 10 is a land portion potential I _l and a groove portion potential I _g.
3 is a graph showing the potential change of

FIG. 11 is a graph showing changes in push-pull tracking error potential TE _pp before and after recording.

FIG. 12 is a graph showing a potential change of a 3-beam tracking error potential TE _3b .

FIG. 13 is a graph showing potential changes of I _top , I _11T , and I _3T .

FIG. 14 is a land potential I _l and a groove potential I _g.
3 is a graph showing the potential change of

FIG. 15: Push-pull tracking error potential TE _pp
It is a graph which shows the change of.

FIG. 16 is a graph showing potential changes of I _top , I _11T , and I _3T .

FIG. 17 is a graph showing a potential change of a 3-beam tracking error potential TE _3b .

[Explanation of Codes] 1 ... Information recording medium 11 ... Light transmissive substrate 12 ... Light absorbing layer 13 ... Light reflecting layer 14 ... Protective layer 70 ... Pre-groove

Front page continuation (72) Inventor Fumio Matsui 6-1-1, Fujimi, Tsurugashima City, Saitama Pioneer Co., Ltd.

Claims (3)

[Claims] 1. An information recording medium having a light absorbing layer on a light transmissive substrate having a pre-groove formed on one side surface thereof, and a light reflecting layer on the light absorbing layer, wherein the light absorbing layer is A first cyanine dye having a light absorption band in the wavelength region of the recording light or the reproduction light, and a light absorption band on the shorter wavelength side than the first cyanine dye, and the wavelength of the recording light or the reproduction light. A second cyanine dye having a small light absorption in the region, a first quencher for preventing the photodegradation of the cyanine dye, and a second quencher of a diphenylamine compound are contained. The weight ratio of the second cyanine dye is α, the weight ratio of the first quencher to the second quencher is β, the first quencher to the added weight of the first cyanine dye and the second cyanine dye, and Second quencher When the ratio of the added weight with is γ, it is contained so as to satisfy the condition of α = 1 to 3 β = 0.5 to 1 γ = 0.25 to 0.5 α · γ <1.1. An information recording medium characterized by the above. 2. The first cyanine dye is represented by the following general formula: Is a cyanine dye represented by the formula (wherein R ₁ and R ₂ each represent an alkyl group having 1 to 8 carbon atoms, X ⁻ represents a counter ion), and the second cyanine dye is represented by the following general formula: [Chemical 2] Is a cyanine dye represented by the formula (wherein R ₃ and R ₄ each represent an alkyl group having 1 to 8 carbon atoms, and X ⁻ represents a counter ion), and the first quencher is represented by the following general formula: 3] Is a Ni complex represented by the formula: wherein R ₅ , R ₆ , R ₇ and R ₈ each represent hydrogen or a substituent in place of the hydrogen, and the second quencher is represented by the following general formula: A diphenylamine compound represented by the formula (in the formula, R ₉ ,
R ₁₀ and R ₁₁ represent hydrogen, a nitroso group, a substituted or unsubstituted amino group, or a substituted or unsubstituted aryl group)
The information recording medium according to claim 1, wherein 3. The pre-groove has a groove depth of λ / 6.5n to λ / 2.5n (where λ is the wavelength (nm) of recording light or reproducing light, and n is the refractive index of the substrate. Represent),
3. The information recording medium according to claim 1, wherein the groove width is 0.35 to 0.47 [mu] m.