JPS60103534A - Member for recording information - Google Patents

Abstract

PURPOSE:To suppress the reduction of S/N ratio of quality of a reproduced signal by laminating sequentially a metallic recording layer and a metallic compound stabilizing layer on a base and providing a protection layer made of an inorganic material or an organic material on the upper layer so as to prevent exfoliation of the metallic compound stabilizing layer. CONSTITUTION:A mixture layer 2 of a metallic compound and a metal, the metallic recording layer 5, and the metallic compound stabilizing layer 6 are provided on the base 1 and the protection layer 7 made of the inorganic material or the organic material is provided to the upper layer. Bi alloy added with Sb or Sn is especially preferred as the metal constituting the metallic recording layer 5 because it has high sensitivity and high S/N ratio. Oxides of Si, Al, Ge or other metals are used for the metallic compound stabilizing layer 6. Oxide, fluoride or nitride of tantalum is preferred as the inorganic material used for the protection layer 7 and a fluoro-polymer is preferred as the organic substance. Even if faces opposite to each other are contacted at pit forming in the hollow sandwich structure, no exfoliation of the metallic compound stabilizing layer is caused.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording member, and more specifically, to an information recording member capable of recording with excellent stability even when laser light is irradiated from the transparent substrate side.

Conventionally, high-density energy such as a laser beam is focused into a spot and irradiated onto the recording medium to melt or evaporate a portion of the medium, thereby deforming or removing it for recording. This is known as the so-called heat mode recording method.

This heat mode recording method is a dry type that does not require processing liquids such as chemicals, is a real-time recording method, is capable of high-speed, high-contrast, large-capacity recording, and allows additional writing of information. For example, micro images,
It has a wide range of uses including CQM, video discs, and computer memory.

By the way, when using the heat mode recording method described above, especially for video discs, computer memories, document files, still image files, etc., it is usually necessary to use a circular glass plate to remove the fat. While rotating the formed disk at high speed, a laser beam is focused, and a 0.
A method of recording information by forming holes of about 6 μm to 1.5 μm has been adopted. The position and size of the hole at this time depend on the output waveform of the pulse-modulated laser light and are formed in accordance with the information input to the laser.

Reading out signals recorded on a recording material can be done by focusing a laser beam with a weak output that does not exceed the recording threshold on the recording material that is rotating at high speed, and detecting changes in the reflected light. can.

Many materials have been proposed for heat mode recording using the above method, but none have been found to be satisfactory in terms of sensitivity to laser light, S/N ratio of reproduced signal quality, and stability. tQ In order to overcome the drawbacks of such conventional heat mode recording materials, the present inventors have conducted various studies and developed a method in which a metal recording layer and a mixed layer consisting of a metal compound and a metal are first laminated. By doing so, it is possible to form well-shaped holes, and as a result, this improvement in S and a significant improvement in sensitivity to laser light are obtained. We obtained the knowledge that the characteristics can be greatly improved by providing the - Also, as a recording form, as shown in FIG. 1, when pits are formed, the metal recording layer 5 is melted and dispersed to form holes, and at this time, the metal compound stabilizing layer 6 provided on the upper layer rises up. It has been found that by maintaining such a configuration, the recording characteristics and stability are improved.

By the way, as shown in FIGS. 2 and 3, in order to protect the recording film from scratches and dust, it is generally good to protect the recording film in a hollow sandwich structure. However, in this structure, if an elastic substrate is used, the opposing surfaces may come into contact during handling.

When the opposing surfaces come into contact, the metal compound stabilizing layer that bulges after recording on either or both of the opposing surfaces may peel off regardless of the material of the opposing surfaces, or may cause other damage. Pinholes may also occur in the area. If peeling occurs in the metal compound stabilizing layer in this way, an oxidizing atmosphere may enter from the peeled area, oxidizing the metal recording layer, and creating a transparent layer or vinyl poles. be. Furthermore, regarding the recording characteristics, the VN ratio, which is the quality of the reproduced signal, decreases by several aB after contact.

In order to prevent the peeling that occurs when opposing bodies come into contact in this way, the inventors of the present invention have conducted further intensive studies and found that a protective layer made of an inorganic or organic substance is added to the upper layer of the metal compound stabilizing layer. It has been discovered that by providing a layer, the objective can be achieved and the reduction in the C/N ratio of the reproduced signal quality, which is a characteristic of recording 4,1', can be suppressed.Based on this knowledge, the present invention has been developed. It was completed.

That is, the present invention provides an energy beam irradiation method.
In an information recording medium having a structure in which a metal recording layer and a metal compound stabilizing layer are sequentially laminated on a substrate to record information by forming pits, an inorganic or organic material is added to the upper layer of the metal compound stabilizing layer. In the information recording member of the present invention, which is characterized in that it is provided with a protective layer made of a substance, the inorganic substance used in the protective layer provided on the metal compound stabilizing layer includes tantalum oxide, fluoride, and nitride. Preferred organic materials include fluorine-based polymers.

The thickness of this protective layer is in the range of 50 to 500X in the case of an inorganic protective layer such as tantalum oxide, fluoride, and crabide.
In particular, the range of 100 to 300^ is preferable.When a protective layer made of an inorganic or organic substance is provided in this way, peeling that occurs when the opposing surfaces come into contact can be prevented only when the opposing surfaces come into contact. Even if the upper layer of the metal compound stabilizing layer is
It is thought that the presence of the protective layer made of an inorganic or organic substance reduces the adhesive force between the opposing surfaces and prevents peeling, regardless of the type of material of the opposing surfaces.

If the thickness of the inorganic protective layer is less than 50λ, the inorganic protective layer is too thin and the effect of reducing adhesion is small, and the effect of preventing peeling cannot be obtained, and peeling occurs to the same extent as when no protective layer is provided. On the other hand, if the temperature exceeds 500K, the film thickness is too thick, causing a significant decrease in sensitivity, making it impossible to record.

Furthermore, if the film thickness of the above-mentioned A. However, if the thickness exceeds 500X, the film thickness is too thick and peeling occurs.

In the information recording member of the present invention, there is a method in which a mixed layer or a chromium layer consisting of a metal compound and a metal is interposed between the metal recording layer and the substrate; A method of providing a chromium layer and a metal compound layer, a method of providing a mixed layer and a metal compound layer consisting of a metal compound and a metal sequentially from the substrate between the metal recording layer and the substrate, etc. are preferably carried out in order to improve the characteristics. be exposed.

Next, these structures will be explained according to the attached drawings. FIG. 4 shows a mixed layer 2 made of a metal compound and a metal provided on a substrate 1, and a metal layer f! , a structure in which a layer 5, a metal compound stabilizing layer 6 is provided, and a protective layer 7 made of an inorganic or organic material is provided on top of the layer 5, and FIG. 5 shows a mixture of a metal compound and a metal in FIG. 4. A structure in which a metal compound layer 4 is provided between the layer 2 and the metal recording layer 5, and FIG. 6 shows a structure in which a chromium layer 3 is provided in place of the mixed layer 2 consisting of a metal compound and metal in FIG. 7 shows a structure in which a metal compound layer 4 is provided between the chromium layer 3 and the metal recording layer 5 in FIG. 6.

In the information recording member of the present invention, aluminum, mica, surface-colored stainless steel, etc. can be used as the substrate that plays the role of a support, but when irradiating laser light from the substrate side, the substrate It needs to be transparent.

Generally, it is known that the transparency of a substance differs depending on the wavelength of incident light, but when recording information on the member of the present invention, semiconductor laser, argon gas laser, H
Various types of light sources with different light wave characteristics can be used, such as a θ-Ne laser, various other lasers with oscillation wavelengths in the visible region or near-infrared region, and xenon flash lamps. However, if it is desired to use the light source specified in 4., it is preferable to use a substrate made of a material that has transparency suitable for the light wave characteristics of the light source in order to improve sensitivity. . As for transparency, it can be assumed that the material exhibits a transmittance of approximately 90% or more of incident light.

Substrates with sufficient transmittance for any of the above light sources include inorganic materials such as glass, or polymers such as polyester, polypropylene, polycarbonate, polyhinyl chloride, polyamide, polystyrene, polymethyl methacrylate, or variations thereof. Mention may be made of films or sheets made of organic materials such as polymers, copolymers, blends, etc. In addition, in cases where the surface smoothness of the substrate itself has a large effect on the VN ratio of the signal, such as in the case of video discs, it is possible to use a substrate on which the above-mentioned material is evenly coated using a spin cord or the like on another substrate. preferable.

Particularly preferably used substrates include films and sheets made of polyester or polymethyl methacrylate.

In the recording member of the present invention, the metal of the mixed layer formed of the metal compound and metal used in the member having the structure shown in FIGS. 4 and 5 is stable with respect to the metal compound and has many properties. There is no particular restriction as long as it is, but preferred examples include AI, Si, 8c, Ti, V, Or
, Mn, F8. Co, Ni.

Ou, Zn, Ga, Ge, As, Sr, Y, Zr,
Nb, Tc.

Ru, Rh, Pd, Ag, In, Sn, S
b, La, Hf, Ta.

Re, Engr, Tl, Pb, Bi, D7
, Er, Gd, Nd, Pr.

Bm, Mo, Au, Be, W, Pt,
Examples include Te.

Among these metals, those that are stable against heat during laser recording are desirable, and particularly preferred are Hf, Ta,
, Re, Ir, Dy, Er, Nd
, Mo, W.

Examples include pt.

These metals may be used alone or.

Two or more types may be used in combination.

On the other hand, as for the metal compound, any compound may be used as long as it forms a mixed layer with the metal. Preferred examples include Li, Be, and B.

Mg, Al, Si, C! a, sc,
Ti, V, Or, Mn.

Fe, Co, Ni, Cu, Zn,
Ga, Ge, As, Sr.

Y, Zr, Nb, Tc, Ru, R
h, Pd, Ag...

Sn, Sb, Ba, La, Hf,
Ta, Re, r', Pb.

Bi, Ce, Mo, Te, W, D
y, Er, Gd, Nd.

Oxides, fluorides or nitrides of Pr, Sm, Tl can be used.

The most preferred metal compound is A12Q3. ZrO2゜0r203. Geo2* 5102 + B1203
1 As203+ 5nOz +Sb203 + Ta
203, Y2O3, Sm2O3, etc., 4゛S
to a glass-forming oxide 1 such as 5iQ2. GeQ□.

Since A1□03 and the like are amorphous and have a network structure, they have excellent blocking properties and are effective in preventing oxidative deterioration of the metal recording layer and stabilizing it. These metal compounds may be used alone or in combination of two or more types.A method for forming a mixed layer is to separate the metal and metal compound in separate evaporation boats or electron beam evaporation crucibles. A method of co-evaporating or alternately depositing the metal and a metal compound, or a method using a known thin film forming method such as a resistance heating method, a collectron beam evaporation method, an ion blating method, etc. using a mixed pellet of metal and a metal compound is used. be able to. Among these, the vacuum deposition method is advantageous because it can easily achieve this purpose, and 10=
A stable mixed layer can be obtained in a high vacuum of Torr or less.

The thickness of this mixed layer is in the range of 50 to 1 aaoa, preferably 100 to 800. 0 to 80% of the entire layer (including section 0)
, preferably in the range of 10 to 60.

As for the structure of this mixed layer, in the plane parallel to the substrate, that is,
In order to prevent unevenness in the characteristics of the laser beam depending on the location, the filling ratio in a plane parallel to the substrate needs to be uniform. In addition, in the direction perpendicular to the substrate, it is preferable to make the filling rate non-uniform from the viewpoint of stability, and the local filling rate is Q~? (As any value between 110%.

Even in that case, it is preferable that the average filling rate of the entire mixed layer falls within the above range.

As the metal constituting the metal recording layer in the recording member of the present invention, all metals already known as recording materials can be used, but metals that are excellent in sensitivity and S/N ratio include: ni, sb.

Sn, Zn, In, Pb, Au, G
e, Tl, cd, As.

Se, Te, and combinations thereof are preferably used. Among them, sb or Sn-added Bi
Gold alloys are particularly preferred because they have high sensitivity and a high S/N ratio.

In the present invention, the metal recording layer may be a single layer or may be a plurality of layers. In particular, when two or more types of metals are used in combination, it may be a single layer made of an alloy of two or more types of metals, or a plurality of layers in which several types of single metal layers are laminated. Furthermore, in order to ensure that the hole shape of the recorded information is not particularly disturbed, it is preferable that several types of single metal layers are laminated.

The metal recording layer may contain a small amount of a metal oxide, particularly a lower oxide, as long as it does not impair the object of the present invention.

This metal recording layer can be formed by a thin film forming technique such as a vacuum evaporation method, a sputtering method, an ion blating method, an electroplating method, an electroless plating method, or a plasma evaporation method.

Among these methods for forming the metal recording layer, the vacuum evaporation method is preferred because it is simple and has good reproducibility.
Vapor deposition at 0-5 Torr or less is preferred. The thickness of this metal recording layer is determined depending on the application, but is 100 to 50 mm thick.
00 holes, particularly in the range of 150 to 400X.

In the recording member of the present invention, the metal compound stabilizing layer provided above the metal recording layer contains, for example, Be, Li, etc.
, B, Mg, Aj7, Si, Ca
, sc, Ti.

V, Or, Mn, Fe, Co, N
i, (jl, Zn, Ga.

GO, As, Sr, Y, Zr, Nb
, Tc, Ru, Rh.

Ag, ■n, Sn, Eib, Ba,
La, Hf, Ta, Re.

■r, Tl, Pb, Bi, Dy,
Er, Gd, Nd, Pr.

Oe, Pm, Tb, Ho, Tm,
Oxides, nitrides, and fluorides of metals such as Yb, Lu, and Srn, especially Sj.

Al, Ge, Sb, Zr, Bi,
Zn, Li, Mg, Ti.

La, Os, Y, Dy, Er, G
d, Hf, Sm, Or.

Nd, Pr, Pm, Eu, Tb, n
Oxides of metals such as o, Tm, Tb, and Lu are preferably used.

It is preferable to use two or more types of these metal compounds to form a two-layer structure of different metal compounds in order to adjust the shape of the pores formed as information recording and to ensure their stability.

As a method for forming the metal compound stabilizing layer, a thin film forming technique such as a vacuum deposition method, a sputtering method, an ion blasting method, or a plasma deposition method can be applied. It can also be formed by reactive sputtering using a gas such as air, oxygen, or oxygen-argon, using a plurality of targets made of different single metals or a target containing two or more types of metals.

The thickness of the metal compound stabilizing layer depends on the type of compound used, but if it is too thick, it will promote the occurrence of cranks and wrinkles, so it is preferably 100X or less, particularly in the range of 20 to 300X.

In the recording member of the present invention, examples of the inorganic substance constituting the protective layer provided on the metal compound stabilizing layer include tantalum oxide, fluoride, or nitride. These may be used alone or as a mixture. For 40°, tantalum oxide is preferably used.

As a method for forming the inorganic protective layer made of the Kuntal compound, thin film forming techniques such as vacuum evaporation, sputtering, ion blasting, and plasma evaporation can be applied. It can also be formed by reactive sputtering using a gas such as air, oxygen, nitrogen, or oxygen-argon using a target made of tantalum.

The thickness of the inorganic protective layer of the tantalum compound is 50 to 500 mm.
8, preferably in the range of 100 to aOO.

Further, examples of the organic substance constituting the protective layer include fluorine-based polymers, which may be used alone or as a mixture. Particularly preferred is Teflon (trade name).

As a method for forming the fluoropolymer ladle protective layer, thin film forming techniques such as vacuum evaporation, sputtering, electron beam evaporation, and plasma polymerization can be applied. Further, it can be formed by dissolving the fluorine-based polymer in a suitable solvent and applying it, or by laminating it as a thin film. Particularly for this purpose, vacuum evaporation is preferred.

The thickness of the organic protective layer made of fluoropolymer is 100
-500X, preferably 150-300X.

As shown in FIG. 5, a preferable recording member of the present invention has a metal compound layer between a mixed layer of a metal compound and a metal and a metal recording layer.
, lIH construction is praised. For this metal compound layer, the same material, formation method, and film thickness as the metal compound stabilizing layer described above are employed.

A more preferable structure is one in which a chromium layer and a metal compound layer are sequentially provided between the metal recording layer and the substrate from the substrate side, as shown in FIG.

Examples of methods for forming the chromium layer include vacuum evaporation, sputtering, ion blasting, electroplating,
Thin film forming techniques such as electroless plating and plasma deposition can be applied.

Among the methods for forming the chromium layer, vacuum deposition is preferred because it is simple and has good reproducibility, but from the viewpoint of stability under high temperature and high humidity, deposition under high vacuum, especially at 1O-5 Torr or less, is more preferable. preferable. Further, the chromium layer may contain a small amount of the chromium oxide, particularly a lower oxide, as long as it does not impair the purpose of the present invention.

The thickness of this chromium layer is greater than 30λ and less than 200λ, preferably in the range of 40 to sop.

In the ↑111 report recording member of the present invention, since the metal compound stabilizing layer is provided with the protective layer 1 and 2, even if opposing parts come into contact during bit formation in the hollow sand winch structure, the The metal compound stabilizing layer does not peel off, the recording characteristics and stability are good, and the C/N ratio hardly decreases.

Next, the present invention will be explained in more detail with reference to Examples.

Note that the filling ratio on each side means the proportion of the volume occupied by the metal fine particles in the mixed layer (the entire layer is taken as 1).

Example 1 Thickness with good surface smoothness created by casting method 1.
A 211J polymethyl methacrylate (PMMA) plate was processed into a 30 Cliter diameter disk and set in a vacuum evaporator tank.

The disk is rotatable in the center of the device. The device is equipped with an electron beam device having six heated evaporation boats and five crucibles centered around a rotating shaft.

13i and Sb were placed in each of these six heating boats.

Put Cr into the six crucibles of the electron beam device, and place “12
03 1 Y2 o31 Ta2o5 were added respectively. After setting the inside of the apparatus to a vacuum level of 3 x 10'''' Torr, the substrate rotation speed was set to 1 oarp'm, and first, A
12O3 and Or were vapor-deposited to form a uniform mixed film by simultaneous vapor deposition to form a mixed layer with a film thickness of 120 mm and a filling ratio of 0.5.

Next, Y2O3 was used as the metal compound layer at 60λ, IOA was used as the metal recording layer in the order of Sb and BiO so that the atomic ratio of sb was 20 atm%, and Y2O3 was used as the metal compound stabilization layer. 601 and Ta205 were sequentially laminated in a 120×1 layer as a protective layer.

As a comparative example, except that Ta205 of the protective layer was set to 0λ,
A sample with the same structure as in Example 1 (Comparative Example 1) and a sample with the same structure as in Example 1 (Comparative Example 2) were prepared, except that the Ta2Q5 of the protective layer was changed to 600X.

The film thickness is monitored using a crystal oscillator method and controlled automatically in a programmed sequence, and the entire deposition process is completed within 2 minutes. No intentional heating of the substrate was performed, and there was almost no rise in substrate temperature due to vapor deposition.

In order to evaluate the recording material produced in this manner, a contact jig as shown in FIG. 8 was used to check the contact load and the presence or absence of peeling. In addition, in order to evaluate the recording material prepared in this way, the light of a semiconductor laser with an oscillation wavelength of 840111M was focused onto the recording surface through a PMMA substrate with a thickness of 1.2 mm using a lens to a beam diameter of 1 μm. , with a frequency of 1.05 while rotating the disk at a speed of 600 rpm.
Recording was performed using a laser beam modulated to a pulse width of 475 nBθC with a DAT ratio of 1:1. Note that the laser light irradiation was performed from the opposite side of the substrate. An oblong hole was formed in the area irradiated with the laser beam, and the short diameter of the hole was approximately 1 μm.

The C/N ratio of the reproduced signal was also measured using a spectrum analyzer for the signals recorded at the practical record values before and after contact.

The structures and evaluation results of these samples are shown in Table 1.

When these samples were evaluated using the method described above, in Example 1, no peeling occurred even at a contact load of 5.0 kg, and
The beetle ratio of the repopulation signal is 53 dB before contact and 52 dB after contact.
Almost no decline was observed.

Next, in Comparative Example 1, peeling occurred at a contact load of 1.0 kg, and the C/N ratio of the reproduced signal was 52 dB before contact and 47 dB after contact.
A decrease of 50 dB was observed.

On the other hand, in Comparative Example 2, since the protective layer was too thick, recording was not possible, and it was not possible to confirm whether peeling occurred.

Examples 2 to 4 Example 1 except that the thickness of Ta205 in the protective layer was changed.
I created a sample with the same structure.

That is, on the same substrate as in Example 1, using the same method as in Example 1, the protective layer with Ta2O5 of 70λ (Example 2), 200X (Example 3), and 27OA'' (Example 4) was formed.
Each sample was created.

Each sample was evaluated in the same manner as in Example 1. The results are shown in Table aS1.

In Example 2, peeling occurred at a contact load of 2.0 kg, and the CA ratio of the reproduced signal was 51 aB before contact and 48 dB after contact, a decrease of 3 dB.

In Example 6, contact load 5. No peeling occurs even with OkQ,
Furthermore, the C/C ratio of the reproduced signal was 52 dB before contact and 52 dB after Ji contact, with no decrease observed.

In Example 4, no peeling occurred even under a contact load of 5.0 kg.
The C/N ratio of the reproduced signal was 52 dB before contact.

After contact, it reached 524B and no decrease was observed.

Example 5 B15b was placed in each of the three heating boats in the vapor deposition machine tank.
, Teflon, and Or and Sm2O3 were placed in two crucibles of an electron beam evaporation apparatus in the same manner as in Example 1.
MMA O) 5 X 10-' Torr on the disk
(7) Vapor deposition was performed in a vacuum.

The deposition order was as follows: first, Or was deposited as a metal layer to a thickness of 60 μm, and then Sm2O3 was deposited as a metal compound layer.
is 60K, as a metal recording layer, and sb is 20 in atomic ratio.
The film thickness was 600X in the order of Sl) and Bi to contain atm%, and Sm2O3 as a metal compound stabilizing layer.
60A1 protective layer and Teflon 18OA.

Samples were prepared by sequentially stacking layers. .

As comparative examples, samples of Comparative Example 3 had the same structure as Example 5 except that the protective layer was made of Teflon of 600X, and Comparative Example 4 had the same structure as Example 5 except that the protective layer of Teflon was 600X. I created a sample.

Example 5, Comparative Example 3, and Comparative Example 4 were evaluated in the same manner as in Example 1.

The structure and evaluation results of the sample are shown in Table 1.

In Example 5, no peeling occurred even under a contact load of 5.0 kg.
Furthermore, the C7N ratio of the reproduced signal was 54 dB before contact.

After contact, it was 54 dB and no decrease was observed.

Next, in Comparative Example 3, peeling occurred at a contact load of 1.0 kg,
The regeneration ratio of the reproduced signal is 54aB before contact and 49dB after contact.
A decrease in 5 aB was observed.

On the other hand, in Comparative Example 4, since the protective layer was too thick, it was impossible to record, and therefore it was not possible to confirm whether or not peeling occurred.

Examples 6 to 8 Samples having the same structure as Example 5 were created except that the thickness of the Teflon layer of the protective layer was changed.

That is, on the same substrate as in Example 5, using the same method as in Example 5, the protective layer of Teflon was 120"A (Example 6), 220"A (Example 1), and 270X (Example 8). )
Each sample was created.

Each sample was evaluated in the same manner as in Example 1. The results are shown in Table 1.

In Example 6, contact load] E3. Peeling ujff occurred in Okg, and the C7N ratio of the reproduced signal was 55 dB before contact and 52 dB after contact, a decrease of 3 dB.

In Example 7, contact load 5. [No peeling occurred even at 1 kg, and the C/N ratio of the reproduced signal was 54aB before contact.

After contact, it was 54 dB and no decrease was observed.

Example 8 is a contact load M5. No peeling occurs even with Okg.
Also, the playback signal ratio is 55 dB before contact and 55 dB after contact.
dB and no decrease was observed.

In addition, contact cargo! 1.0 kg of J-force corresponds to the force when touching with a finger.

[Brief explanation of the drawing]

No. 11xl is a cross-sectional view of the information recording member after pit formation;
FIGS. 2 and 6 are cross-sectional views of information recording members made of hollow sandwich structure, and FIGS. 4, 5, 6, and 7 are different examples of the information recording members of the present invention. FIG. 8 is a schematic cross-sectional view of a contact jig for evaluating an information recording member. In the figure, 1 is the substrate, 2 is a mixed layer consisting of a metal compound and metal, 3 is a chromium layer, 4 is a metal compound layer, 5 is a metal recording layer, 6 is a metal compound stabilization layer, 7 is a capture layer , 8 is a layer formed between the metal recording layer and the substrate, 9 is a sensitive material layer, 10
1 is a spacer, 11 is a hollow sandwich structure disk, and 12 is a load. 1.1 Applicant Asahi Kasei Corporation Agent Same form Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (1)

[Claims] 1. Information having a structure in which a metal recording layer and a metal compound stabilizing layer are sequentially laminated on a substrate, for recording information by forming bits by irradiation with an energy beam. 1. An information recording member characterized in that a protective layer made of an inorganic substance or an organic substance is provided on the metal compound stabilizing layer in a recording medium. 2 The structure of the information recording medium is such that a metal recording layer is provided on a substrate, a mixed layer consisting of a metal compound and a metal is interposed between the metal recording layer and the substrate, and a metal compound is provided in the soil of the metal recording layer. 1 which is 41117 construction with a stabilizing layer! 1. An information recording medium blade according to claim 1.