JPH0689459A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To obtain at a low cost the optical refractive layer having nessesary optical refractivity by laminating three or more layers of the unit optical refractive resin layers consisting of the resin material containing a dye and a resin material having a prescribed value of the real number parts of complex refractive index, and consisting of high and low refractive index layers on the light- transmissive substrate forming a pregroup. CONSTITUTION:The soln. dissolving a cyanine dye in ethylcellosolve is applied on the substrate 2 made of light-transmissive polycarbonate which forms spiral pregroup 7, and a high refractive index layer 5 is formed. The soln. dissolving a polyolefin in ethylcyclohexane is applied on the layer 5 and a low refractive index layer 6 is formed. The real number parts of the complex refractive indexes of the layer 5 and 6 are above 2.0 ndye at the layer 5 and below 1.6 nenh at the layer 6. The optical refractive resin layer 3 is formed by laminating three or more layers of the unit optical refractive resin layer 3A consisting of the layer 5 and 6, and a protective layer 4 is formed on the layer 3. In this way, nessesary optical refractivity is secured and can be produced at a low cost without providing a metallic optical refractive layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording medium, and particularly functions as a write-once type or rewritable type capable of obtaining a required reflectance without providing a light reflecting layer made of metal. The present invention relates to an optical information recording medium that can be used.

[0002]

2. Description of the Related Art At present, a light-absorbing layer made of an organic dye material, a light-reflecting layer made of a metal material, and a protective layer made of a resin material are provided in this order on a light-transmitting substrate having a spiral pre-groove. The optical information recording medium is a read-only
It is put on the market as an optical information recording medium having complete compatibility with a so-called ROM type CD (compact disc).

In such an optical information recording medium, the optical phase difference between the pits and the non-pits on the pre-groove when irradiated with laser light is caused by the decomposition of the light absorbing layer during recording with laser light and the thermal deformation of the substrate. Then, due to the effect of the light diffraction, an ordinary CD player is used like a conventional CD, and the same reproduction as that of the CD is performed.

Therefore, the light reflectance of the light reflecting layer on the light absorbing layer is important for maintaining compatibility with the CD.

However, such a light-reflecting layer made of metal is required to maintain a light reflectance similar to that of a CD.
In addition to using expensive materials, such as vapor deposition equipment, spatter, and large-scale manufacturing equipment such as vacuum equipment for these equipment, a large proportion of the cost of the disk in this process is a problem There is.

Further, since the adhesiveness between the light absorbing layer and the protective layer, which are in close contact with the light reflecting layer, is inferior to the adhesiveness between other organic materials, there is a problem that they are easily peeled off from this portion. is there.

Further, an elastomer layer containing a light absorber and a thermoplastic resin layer are respectively formed on the substrate, and the elastomer layer becomes a deformable layer by irradiation of laser light, and the thermoplastic resin layer is deformed and held. A rewritable optical information recording medium in which recording and erasing are repeated by forming a layer is also known.

When an optical information recording medium having such a structure is provided with a metallic light-reflecting layer so that the light reflectance and the degree of modulation can be made equal to those of a commercially available CD, an elastomer layer and a thermoplastic resin layer are provided. The deformation amount of the layer interface between and is 1
However, there is a problem in that reliability is poor due to a large amount of deformation and the repeated erasing characteristics and recording / reproducing characteristics are often adversely affected.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and can be manufactured at a low cost because the required light reflectance can be secured without providing a metal light reflecting layer. An object is to provide an optical information recording medium that can be used.

[0010]

That is, the present invention focuses on the reflection of light between layers having different refractive indexes. The first invention is a substrate having a light-transmitting property and a pre-groove, It is provided on this substrate and contains a dye of high refractive index, and the real part ndye of its complex refractive index is ndye ≧ 2.
A high refractive index layer having a refractive index of 0 and a low refractive index layer having a real part nenh of the complex refractive index of nenh ≦ 1.6, which is made of a resin material, are provided, and the high refractive index layer and the low refractive index are provided. An optical information recording medium is characterized in that a light-reflecting resin layer is formed by laminating three or more unit light-reflecting resin layers each having a refractive index layer.

A second aspect of the present invention is a substrate having a light-transmitting property and formed with a pre-groove, a dye provided on the substrate and having a high refractive index, and a real part n of a complex refractive index thereof.
The dye is composed of a high refractive index layer with ndye ≧ 2.0 and a resin material, and the real part nenh of its complex refractive index.
A low-refractive index layer satisfying nenh ≦ 1.6, and a light-reflecting resin layer in which an even number of the high-refractive index layer and the low-refractive index layer are laminated is formed. Is.

A third aspect of the present invention is a substrate having a light-transmitting property and formed with a pre-groove, a dye provided on the substrate and having a high refractive index, and a real part n of a complex refractive index thereof.
The dye is composed of a high refractive index layer with ndye ≧ 2.0 and a resin material, and the real part nenh of its complex refractive index.
A low-refractive index layer satisfying nenh ≦ 1.6, and a light-reflecting resin layer formed by laminating an odd number of the high-refractive index layer and the low-refractive index layer is formed. Is.

In a fourth aspect of the present invention, a substrate having a light-transmitting property and formed with a pre-groove, a dye provided on the substrate and having a high refractive index, and a real part n of its complex refractive index are included.
The dye is composed of a high refractive index layer with ndye ≧ 2.0 and a resin material, and the real part nenh of its complex refractive index.
, And a low refractive index layer satisfying nenh ≦ 1.6, an even number of the high refractive index layer and the low refractive index layer are laminated, and the film thickness of the uppermost low refractive index layer is λ / 2 (λ Is a light-reflecting resin layer having a wavelength of a reproducing laser beam).

The high refractive index layer and the low refractive index layer can be laminated by a spin coating method.

The thickness of each of the high refractive index layer and the low refractive index layer is d, and the real part of the complex refractive index is n,
Each layer may have a real part n of complex refractive index and a layer thickness d such that 0.8 ≦ 4nd / λ ≦ 1.2, where λ is the wavelength of the reproducing laser beam. desirable.

Further, the change amount of the real part of the complex refractive index of the high refractive index layer caused by the irradiation of the recording laser beam is Δ.
ndye, the average film thickness per layer of the plurality of high refractive index layers is ddye, the number of layers of the high refractive index layers is Pdye, and the wavelength of the reproduction laser beam is λ, then 0.10 ≦ Δndye · ddye It is desirable to have a high refractive index layer such that Pdye / λ ≦ 2.5, and similarly, the real part of the complex refractive index of the layer containing the elastomer material (elastomer layer), which is generated by the irradiation of the recording laser beam. Is Δner, the average film thickness per layer of a plurality of elastomer layers is der, the number of elastomer layers is Per, and the wavelength of the reproduction laser beam is λ, 0.10 ≦ Δner · der · der It is desirable to have an elastomer layer such that Per / λ ≦ 2.5.

By selecting such a high-refractive index layer and / or a layer containing an elastomer material, the phase of the tracking error signal will not be inverted between the bit part and the other part, so that stable tracking can be achieved. Can be performed, and the C / N ratio and the degree of modulation are, for example, 6
It is possible to obtain a good reproduction signal that is as large as 0% or more.

Further, Δndye and / or Δner per layer is, for example, three if there are three layers.
The amount of change may be small, such as 4 or less, 0.3 or less for 5 layers, and 0.2 or less for 7 layers, so that the range of material selection is expanded and the degree of freedom in design is increased. It is also possible to obtain the same, and further, it is possible to improve the reliability and the reversible property.

The high refractive index layer may have an elastic elastomer material, and the low refractive index layer may have a thermoplastic resin material.

On the contrary, the high refractive index layer may include a thermoplastic resin material, and the low refractive index layer may include an elastic elastomer material.

The above-mentioned thermoplastic resin material may include a material having absorption at the wavelength λe of the erasing laser beam.

Further, a protective layer can be provided on the light reflecting resin layer.

In short, the present invention is one in which a light reflection resin layer is formed as an optical thin film capable of so-called multiple reflection in which a high refractive index layer and a low refractive index layer are laminated, and specifically, a metal material is used. The high refractive index layer and the low refractive index layer are laminated in this order on the substrate with the respective optical film thickness nd = λ / 4 ± 10% at the wavelength λ of the laser light without providing the light reflection layer. Finally, it is desirable to form a disk by providing a protective layer made of a resin material.

Next, the present invention will be described more specifically with reference to FIGS. 1 and 2. FIG. 1 is a longitudinal sectional view of an essential part of an optical information recording medium 1 according to the present invention. The optical information recording medium 1 includes a transparent substrate 2 and a light reflecting resin layer 3 formed on the substrate 2. And a protective layer 4 formed on the light reflection resin layer 3.

The light-reflecting resin layer 3 is formed by sequentially repeating a unit light-reflecting resin layer 3A composed of a laminate of a high refractive index layer 5 and a low refractive index layer 6 formed on the high refractive index layer 5. It is a thing.

It is desirable to repeat three or more unit light reflecting resin layers 3A, and the illustration of three or more layers is omitted.

A pre-groove 7 is spirally formed on the substrate 2. To the left and right of the pregroove 7, parts other than the pregroove 7, that is, lands 8 are located.

The substrate 2 and the light-reflecting resin layer 3 (the lowermost high-refractive index layer 5) are in contact with each other by a first layer boundary 9.

The high refractive index layer 5 and the low refractive index layer 6 of the light reflecting resin layer 3 are in contact with each other by a second layer boundary 10 and a third layer boundary 11.

The uppermost layer of the light reflecting resin layer 3 (low refractive index layer 6)
And the protective layer 4 are in contact with each other through the fourth layer boundary 12.

The protective layer 6 and the substrate 2 are integrated at their circumferential portions to improve the strength of the optical information recording medium 1 as a whole and to protect the internal light-reflecting resin layer 3 more reliably. can do.

As shown in the figure, when the optical information recording medium 1 is irradiated with recording light (recording laser light) L1, the high refractive index layer 5 or the low refractive index layer 6 of the light reflecting resin layer 3 emits the laser light. Generates heat by absorbing the energy of L1,
Thermal deformation occurs on the substrate 2 side to form pits 13.

The optical information recording medium 1 can be used as a rewritable disc by incorporating an elastomer material or a plastic resin material in each of the high refractive index layer 5 and the low refractive index layer 6.

That is, the high refractive index layer 5 has an elastic elastomer material, and the low refractive index layer 6 is
It has a thermoplastic resin material.

Alternatively, the high refractive index layer 5 has a thermoplastic resin material, and the low refractive index layer 6 has an elastic elastomer material.

The thermoplastic resin material preferably contains a material having absorption at the wavelength λe of the erasing laser light (generally different from the wavelength λ of the recording and reproducing laser light).

In the manufacture of the optical information recording medium 1, the light reflecting resin layer 3 is formed on the substrate 2 by a method such as the conventional spin coating method, and then the protective layer 4 is formed. .

Next, the λ / 4 total reflection condition for reflecting the light incident from the direction of the substrate 2 on the light reflection resin layer 3 will be described.

On a substrate 2 (or a medium such as air) having a refractive index n, a real part n1 of the complex refractive index (the same, imaginary part k1 = 0),
And two layers of the real part n2 of the complex index of refraction (same as imaginary part k2 = 0) are repeated P times (one time for the unit light reflecting resin layer 3A layer consisting of n1 and n2) as λ / 4 film thickness. When laminated, if n2 / n1 <1.0 (1), the light reflectance R (%) increases as P increases, and lim (R) = 100 (%).

The above equation (1) is called a λ / 4 total reflection condition.

Specifically, n1 = ndye (real part of complex refractive index of high refractive index layer 5), and n2 = nenh (real part of complex refractive index of low refractive index layer 6), and ndye ≧ 2.0 (2) nenh ≦ 1.6 (3) is desirable, and the number of repetitions P of the unit light reflection resin layer 3A is desirably 3 or more.

The film thickness of each of the high refractive index layer 5 and the low refractive index layer 6 is d, and the real part of the complex refractive index is n.
When the wavelength of the recording laser beam L1 or the reproducing laser beam is λ, the real part n of the complex index of refraction is 0.8 ≦ 4nd / λ ≦ 1.2 (4) for each layer and It is desirable to have each layer of film thickness d.

FIG. 2 is an enlarged vertical cross-sectional view showing a portion of the light reflecting resin layer 3, and as described above, the high refractive index layer 5 and the low refractive index layer 6 are arranged in this order on the substrate 2 by λ /. The film is repeatedly laminated with a film thickness of 4.

At the wavelength λ of the recording laser beam L1 (for example, 780 nm), the high refractive index layer 5 to the low refractive index layer 6
Is the antinode of the wave of the laser light (second layer boundary 10)
Then, when the wave function of light is maximum, and in the portion where the low-refractive index layer 6 to the high-refractive index layer 5 correspond to the node of the wave of laser light (third layer boundary 11), the wave function of light is 0. When, the light reflectance becomes maximum.

The reflectances r0, r1, r2, r3 at each layer boundary,
r4, r5, r6 ,. ． ． Is expressed as the light reflectance R of the light reflecting resin layer 3.

However, in reality, the imaginary part kdye (k1) of the complex refractive index of the high refractive index layer 5 or the imaginary part kenh (k2) of the complex refractive index of the low refractive index layer 6 is not zero, and some light absorption may occur. Therefore, the light reflectance R is not 100%, and the maximum is 80%.
It is a degree.

When the unit light-reflecting resin layer 3A is laminated, the uppermost layer of the light-reflecting resin layer 3 becomes the low-refractive index layer 6, and when the protective layer 4 is not provided, the low-refractive index layer 6 is further added. Since it is a layer of air with a low refractive index, the refractive index of air is
If r, then nair / nenh <1.0 (5), and since this layer boundary hits the node of the wave of the laser beam L1, it is most reflective when the film thickness of the uppermost low refractive index layer 6 is λ / 4. Is inefficient and the film thickness is λ / 2 or ∞ (infinity)
Therefore, the layer boundary needs to be an antinode portion of the laser beam L1.

Therefore, the thickness of the protective layer 4 formed as a top coat on the low refractive index layer 6 is set to several μm so that the thickness is practically ∞ with respect to the thickness of the low refractive index layer 6, or the protective layer 4 is formed. A configuration in which the uppermost layer is stopped by the high refractive index layer 5 without providing it, or a configuration in which the film thickness of the uppermost low refractive index layer 5 is λ / 2 can be selected.

Specifically, the high refractive index layer 5 and the low refractive index layer 6 are laminated even number of times (second invention), and the high refractive index layer 5 and the low refractive index layer 6 are laminated odd number of times. The uppermost layer may be the high refractive index layer 5 (third invention) or the uppermost low refractive index layer 5 may have a thickness of λ / 2 (fourth invention).

[0050]

In the optical information recording medium according to the present invention, λ /
By the 4 enhancement effect, the light absorption of each layer on the optical information recording medium can be minimized as it is, the transmission of the laser beam can be suppressed, the reflection can be increased, and the light reflectance of 70% or more can be maintained.

In the write-once type recording, this enhancement condition is destroyed by the decomposition of the dye and the deformation of the substrate, and by deviating from the maximum energy reflection condition at the wavelength λ, the return light of the pit portion is suppressed and this is performed. .

The high refractive index layer may be an elastomer layer having elasticity, and the low refractive index layer may be a thermoplastic resin layer having a softening point due to heat, or the high refractive index layer may be a thermoplastic resin layer. Along with, the low refractive index layer as an elastomer layer, when containing a suitable light absorber in each layer, by heat expansion of each elastomer layer by laser light irradiation during recording, the elastomer layer expands and deforms, By holding the deformation of the elastomer layer by heating and melting and re-solidifying the thermoplastic resin, bump-like ridges are formed on the entire surface.

At this time, each of the elastomer layer and the thermoplastic resin layer deviates from the optical film thickness (actual film thickness × refractive index) at which the light reflectance at the wavelength λ of the laser beam becomes maximum due to deformation. The transmitted light is increased and the reflected light is significantly reduced.

That is, bump-like pits are formed in this laser light irradiation portion.

Elasticity remaining in the elastomer layer is obtained by irradiating the pit portion with an erasing laser beam having a wavelength that causes absorption only in the thermoplastic resin layer or by heating the disc itself to a temperature above the softening point of the thermoplastic resin layer. Due to the resilience, each layer returns to the state before recording and the bumps on the layer are smoothed.

At this time, the light reflectance of the pit portion is restored again, and the pit is erased.

Further, since the amount of deformation of each layer is smaller than λ / 4, which is smaller than that of the conventional rewritable optical information recording medium by deformation, the reliability of repeated erasing becomes high.

[0058]

EXAMPLES Next, examples of the present invention will be described. Example 1 On a polycarbonate substrate having a width of 0.4 μm, a depth of 100 nm, a spiral pregroove having a pitch of 1.6 μm and a thickness of 1.2 mm and an outer diameter of 120 mm, 1,1 as a cyanine dye was prepared. '-Dibutyl 3,
2,3 parts by weight of 3,3 ′, 3 ′ tetramethyl4,5,4 ′, 5′-dibenzoindodicarbocyanine iodide (NK-3251 manufactured by Nippon Senshoku Co., Ltd.) and 1,1′-dibutyl. ． ． ． ． ． ． (NK-3 manufactured by Nippon Senshoku Co., Ltd.
345) 8 parts by weight dissolved in ethyl cellosolve was applied by spin coating to obtain a high refractive index layer (dye layer).
Was formed.

At the wavelength of 780 nm, the real part ndye = 2.5 of the complex refractive index of this high refractive index layer and the imaginary part kdye =
It was 0.04.

The average film thickness ddy of the high refractive index layer at this time
e = 81 nm.

On this high refractive index layer, a low refractive index layer (olefin layer) was formed by dissolving polyolefin (Zeonex, Z280 manufactured by Nippon Zeon Co., Ltd.) in ethylcyclohexane and applying it uniformly.

At a wavelength of 780 nm, the real part nenh = 1.55 of the complex index of the low index layer and the imaginary part kenh.
= 0.00.

The average film thickness den of the low refractive index layer at this time
h = 122 nm.

Then, a disk having a substrate-dye layer-olefin layer-dye layer-olefin layer structure was prepared by repeatedly coating the dye layer and the polyolefin layer having the same thickness on the low refractive index layer. Create and S on this
A protective layer was formed by applying D-17 in a thickness of 4 μm.

Ndye · ddye = 20 for each dye layer
2.5 nm, olefin layer nenh · denh = 189.1
nm, and when λ = 780 nm, each 4
nd / λ = 1.04, and 0.97.

The optical information recording medium thus manufactured has a groove reflectance Rg = 70.5 at a wavelength of 783 nm.
%, Push-pull (tracking error signal) = 0.0
It was 9.

Further, DDU-1 was added to the optical information recording medium.
When a signal of 450 kHz was recorded with a laser beam having a wavelength of 795 nm using 000 (manufactured by Pulstec), good recording with a C / N ratio of 50 dB was obtained.

In this optical information recording medium, Δndye =
0.82, ddye = 81 nm, Pdye = 2, λ = 780n
m, therefore Δndye ・ ddye ・ Pdye / λ
=, 0.17.

Furthermore, when the EFM signal was recorded and reproduced by a CD player, it was possible to reproduce.

[Embodiment 2] On the same substrate as in Embodiment 1,
Polyurethane (NE-8855S made by Dainichiseika Co., Ltd.) 6
Parts by weight and 1,1'-dibutyl 3,3,3 ', 3' tetramethyl 4,5,4 ', 5'-dibenzoindodicarbocyanine iodide (NK-3, manufactured by Nippon Sensitive Dye Co., Ltd.)
251) 4 parts by weight dissolved in ethyl cellosolve were applied by a spin coating method to form a high refractive index layer (dye layer).

At the wavelength of 780 nm, the real part ndye = 2.0 of the complex refractive index of this high refractive index layer and the imaginary part kdye =
It was 0.06.

The average film thickness of the dye layer at this time is ddye =
It is 101 nm.

On this high refractive index layer, 9 parts by weight of polystyrene (ST-95 manufactured by Sanyo Kasei Co., Ltd.), 4,4 ',
A low refractive index layer (styrene layer) was formed by dissolving 1 part by weight of 4 ″, 4 ′ ″, tetra-tert-butylphthalocyanine VO complex in ethylcyclohexane and applying the solution by spin coating.

At a wavelength of 780 nm, the real part nenh = 1.59 of the complex index of the low index layer and the imaginary part kenh.
= 0.01.

The average thickness den of the styrene layer at this time is de
h = 119 nm.

Subsequently, the dye layer and the styrene layer, which are the same as the above, were repeatedly coated on the styrene layer with the same film thickness, whereby 5 high refractive index layers and 4 low refractive index layers were formed on the substrate. Formed.

Ndye · ddye = 202 of each dye layer
nm, nenh · denh of the styrene layer = 189.2 nm, and when λ = 780 nm, each 4nd / λ
= 1.04, and 0.97.

The optical information recording medium thus manufactured has a groove reflectance Rg = 71.2 at a wavelength of 783 nm.
%, Push-pull (tracking error signal) = 0.0
It was 5.

Further, DDU-1 was added to the optical information recording medium.
When a signal of 450 kHz was recorded with a laser beam having a wavelength of 795 nm using 000 (manufactured by Pulstec), good recording with a C / N ratio of 45 dB was obtained.

In this optical information recording medium, Δner = 2.
0, der = 14 nm, Per = 5, λ = 780 nm, and therefore Δner · der · Per / λ =, 0.18
Met.

Further, when the EFM signal was recorded and reproduced by a CD player, it was possible to reproduce.

When this optical information recording medium was left at a temperature of 90 ° C. for 0.5 hour and the previously recorded portion was reproduced again, the recording was erased.

[0083]

As described above, according to the present invention, it is not necessary to provide a light reflecting layer made of metal, and various equipments using a vacuum system for providing the light reflecting layer are not required. Since it is only necessary to form a multilayer film, an inexpensive optical information recording medium can be supplied.

Further, since the optical information recording medium is composed of only the organic material, the adhesive strength between the respective layers is improved and the problem of peeling can be reduced.

Further, by laminating the elastomer layer and the thermoplastic resin layer, the degree of modulation can be obtained with a slight amount of deformation in each layer. Therefore, a highly reliable rewritable optical information recording medium by thermal deformation is supplied. be able to.

[0086]

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an essential part of an optical information recording medium 1 according to the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a light reflecting resin layer (high refractive index layer 5 and low refractive index layer 6) of the same.

[Explanation of symbols]

1 Optical Information Recording Medium 2 Translucent Substrate 3 Light Reflecting Resin Layer 3A Unit Light Reflecting Resin Layer 4 Protective Layer 5 High Refractive Index Layer (Dye Layer) 6 Low Refractive Index Layer (Resin Layer, Enhance Layer) 7 Pregroove 8 Land 9 First layer boundary 10 Second layer boundary 11 Third layer boundary 12 Fourth layer boundary 13 Pit ndye (n) Real part of complex refractive index of high refractive index layer 5 kdye High refractive index layer 5 Imaginary part of complex refractive index ddye (d) Average film thickness of high refractive index layer 5 nenh (n) Real part of complex refractive index of low refractive index layer kenh Imaginary part of complex refractive index of low refractive index layer 6 denh ( d) Average film thickness of the low refractive index layer 6 Δndye Amount of change in real part of complex refractive index of high refractive index layer caused by irradiation of recording laser light Pdye Number of high refractive index layer Δner Recording laser light Real number of complex refractive index of layer containing elastomer material (elastomer layer) caused by irradiation Change der average thickness per layer of a plurality of elastomer layers Per number of elastomer layers L1 recording laser light λ recording laser light L1 wavelength λe erasing laser light wavelength r0, r1, r2, r3, r4 , R5, r6 ,. ． ． Reflectance at each layer boundary

Claims (12)

[Claims] 1. A substrate having translucency and formed with pregrooves, and a dye provided on the substrate and having a high refractive index, the real part ndye of the complex refractive index of which is ndye ≧ 2.0. A high refractive index layer and a low refractive index layer which is made of a resin material and whose real part nenh of the complex refractive index is nenh ≦ 1.6 are provided, and the high refractive index layer and the low refractive index layer are An optical information recording medium having a light-reflecting resin layer formed by laminating three or more unit light-reflecting resin layers. 2. A substrate having translucency and formed with a pre-groove, and a dye provided on the substrate and having a high refractive index, the real part ndye of the complex refractive index of which is ndye ≧ 2.0. A high-refractive index layer and a low-refractive index layer which is made of a resin material and whose real part nenh of the complex refractive index is nenh ≦ 1.6 are provided, and the high-refractive index layer and the low-refractive index layer are formed. An optical information recording medium having a light-reflecting resin layer formed by laminating an even number of layers. 3. A substrate having translucency and formed with a pre-groove, and a dye provided on the substrate and having a high refractive index, and a real part ndye of the complex refractive index thereof is ndye ≧ 2.0. A high-refractive index layer and a low-refractive index layer which is made of a resin material and whose real part nenh of the complex refractive index is nenh ≦ 1.6 are provided, and the high-refractive index layer and the low-refractive index layer are formed. An optical information recording medium comprising an odd number of laminated light reflecting resin layers. 4. A substrate having a light-transmitting property and formed with a pre-groove, a dye provided on the substrate and having a high refractive index, and a real part ndye of a complex refractive index thereof is ndye ≧ 2.0. A high-refractive index layer and a low-refractive index layer which is made of a resin material and whose real part nenh of the complex refractive index is nenh ≦ 1.6 are provided, and the high-refractive index layer and the low-refractive index layer are formed. An optical information recording medium, wherein an even number of layers are laminated and a light reflecting resin layer is formed in which the film thickness of the uppermost low refractive index layer is λ / 2 (where λ is the wavelength of the reproducing laser beam). 5. The high refractive index layer and the low refractive index layer,
The optical information recording medium according to any one of claims 1 to 4, wherein the optical information recording medium is laminated by a spin coating method. 6. When the thickness of each of the high refractive index layer and the low refractive index layer is d, the real part of the complex refractive index is n, and the wavelength of the reproducing laser beam is λ, each layer is The optical information recording medium according to any one of claims 1 to 4, wherein each layer has a real part n of complex refractive index and a film thickness d such that 0.8 ≤ 4nd / λ ≤ 1.2. . 7. The change amount of the real part of the complex refractive index of the high refractive index layer caused by the irradiation of the recording laser beam is Δndye,
The average film thickness per layer of the plurality of high refractive index layers is ddy
e, where Pdye is the number of layers of the high refractive index layer and λ is the wavelength of the reproduction laser beam, a high refractive index layer such that 0.10 ≦ Δndye · ddy · Pdye / λ ≦ 2.5 is satisfied. The optical information recording medium according to any one of claims 1 to 4, further comprising: 8. The light according to claim 1, wherein the high refractive index layer comprises an elastomeric material having elasticity, and the low refractive index layer comprises a thermoplastic resin material. Information recording medium. 9. The light according to claim 1, wherein the high refractive index layer includes a thermoplastic resin material, and the low refractive index layer includes an elastic elastomer material. Information recording medium. 10. A change amount of a real part of a complex refractive index of a layer containing an elastomer material (elastomer layer) caused by irradiation with a recording laser beam is Δner, and an average film thickness of each of a plurality of elastomer layers is der. When the number of layers of the elastomer layer is Per and the wavelength of the reproduction laser beam is λ, 0.10 ≦ Δner · der · Per / λ ≦ 2.5 is provided. The optical information recording medium according to claim 1. 11. The optical information recording medium according to claim 8, wherein the thermoplastic resin material includes a material having absorption at the wavelength λe of the erasing laser light. 12. The optical information recording medium according to claim 1, further comprising a protective layer provided on the light reflecting resin layer.