JPS59171045A - Member for recording information - Google Patents

Abstract

PURPOSE:To obtain a member for recording information which has good recording and reproducing characteristics and can be preserved for a long time by forming the thin film on a substrate into >=2 layers and providing a specific layer as at least one layer thereof. CONSTITUTION:Grooves for tracking are formed on the surface of an acrylic resin substrate 1 and after a layer 2 (about 600nm thickness) of a ''Parylene N'', a layer 3(50nm) composed of Sb2Se3, a layer 4(50nm) composed of Bi40Te45Se15 and a layer 5(600nm) of ''Parylene N'' are successively deposited by evaporation thereon, then a layer 6(2mum) of PMMA is coated thereon. Two sheets of such discs are stuck together by means of a self-adhesive agent 7. Recording of information by light is accomplished by utilizing the change in the atomic arrangement of the layers 3 and 4. Since the layer 2 of the org. material (''Parylene N'') having >=350 deg.C b.p. is provided, the reproducing characteristic is improved and the long-term preservation is made possible.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention applies FM modulation of analog signals such as video and audio to a recording thin film provided on a predetermined substrate using a recording beam such as a laser beam. The present invention relates to a recording member that makes it possible to record in real time digital information such as electronic computer data and facsimile signals.

[Background of the invention]

As the above-mentioned recording thin film, a Te0x (0<X<2 film) and a dual layer of a material mainly containing Tek such as S b+ S es and Bi2Te3 are known. In these recording films, at least Te0x I! or Sb2Se3
A layer undergoes an atomic arrangement change such as crystallization, two layers diffuse into each other, a compound is formed, or air bubbles form between or within any layer or with the substrate.
Recording can be performed using one or a combination of two or more mechanisms such as deformation of the recording film.

In these cases, the reflectance of the recorded portion is usually higher than before recording. However, if the recording film is excessively deformed or holes are formed, the reflectance will change in the opposite direction, which must be avoided. However, in conventional recording films of this type, if a material with a high crystallization temperature is used to avoid spontaneous crystallization, it is necessary to raise the temperature to a high temperature during recording, which causes the above-mentioned problems due to excessive deformation. Ta. In addition, materials mainly containing Te are easily oxidized in humid air, making it difficult to store them for long periods of time.

[Purpose of the invention]

An object of the present invention is to solve these problems and provide an information recording member that has good recording/reproducing characteristics and can be stored for a long period of time.

[Summary of the invention]

In order to achieve the above object, in the recording member of the present invention, an organic material layer with a high melting (softening) point and a high boiling point is provided as one layer of the recording film, and a layer of a material mainly containing Te is composed of Se and Sb. Take measures such as adding at least one layer of to improve oxidation resistance.

It is preferable that the organic material layer having a high melting (softening) point and a high boiling point is provided at the interface between the recording film and the substrate.

This layer can be formed by any method such as vacuum evaporation, gas empty evaporation, sputtering, plasma polymerization, spin coating, etc., but vacuum evaporation is simple and allows a uniform film to be formed on the substrate surface even if the surface is uneven. This is preferable in that a thick film can be formed. The thickness of this layer is preferably in the range of 3 Q nm or more and 2 Q nm or less, more preferably in the range of 0.1 μm or more and 2 μm or less. The material for this layer is Parylene (Union Car) (trade name of Ido Co., Ltd., compound name: polyparaxylylene).

Quanine (C3HsNsO) +
Metal phthalocyanine compounds such as copper phthalocyanine, p
- Quarter phenyl has a high boiling point of 350 C or higher and is particularly preferred. In addition, alizarin, perylene, tetraphenyltin, and indigo dyes can also be used.

Furthermore, various other organic substances can be used.

An inorganic substance such as a metal may be mixed into the organic substance film by a method such as codeposition. If the portion of the recording film excluding the above-mentioned organic layer is a single layer, the above-mentioned organic layer is placed on either or both of the interface with the substrate and the top of the recording film. If there are two or more layers excluding the organic layer, various combinations are possible. Three Sb2Se layers as the main recording layer and Bjz as the light reflection/absorption layer
For example, in the case of combination with Tes layer, ■
Substrate-Organic substance-8b2Ses-BizTes-Organic substance■
Substrate-Organic substance-Biz Te5S b2Ses-Organic substance■Substrate-Organic substance-Bi2Te3-Organic substance-S 5e3
-Organic substance■Substrate-Organic substance-5b2SeB-Organic substance-Bj
2T proboscis-Organic ■Substrate-8b2S e3-Organic-13
i2'I'e3-Organic substance ■Substrate-Bi2Te3-Organic substance-Sb25e3-Organic substance substrate-81) 28e3 B
jzTe3-organic ■substrate-Bi2Te3-8b28e
s-Organic matter■ Those without organic matter layer written on the far right in ■～■.

etc. Other thin layers may be interposed between these layers. These disks may be used by being bonded to another similarly shaped disk using an adhesive, adhesive, or the like. In this case, it is particularly preferable to form a protective layer of an organic substance on the bonding surfaces by spin coating or dipping before bonding.

The composition of the reflection and light absorption layer shall contain at least one element of Te and 13i in an atomic percentage of 40% or more, but in order to improve the stability of the recording film, Se, sb It is preferable to contain at least one of the above elements in an amount of 1% or more and 45% or less, particularly preferably 10% or more and 30% or less. In addition to these constituent elements, Pb.

Sn, Qe, Si, In, Zn, Cd, Au.

It may also contain Ag, Cu, etc. For example, Te-8e
, Te-8b, B i -8b, Te-B i
-8b, Te-B1-8e, 'l'e-F3e-Qe
A combination of these is also possible. This composition keeps the thermal conductivity of this layer low, making it heat resistant.

Oxidation resistance can be ensured. The thickness of this layer is 5 nm or more 30
It is preferably 0 nm or less.

The composition of the main recording layer contains 40% or more and 75% or less Se,
It is particularly preferred that the remainder consists mostly of sb, but Sb
In place of I n r Ga + G e , Sn
.

At least one element of Pb and Bi may be used.

In addition, Te0x (o<x<2) or the like may be used. The thickness of this layer is 5nrr! A range of 200 nm or less is preferable. These layers are preferably formed by vacuum deposition, gas vapor deposition, sputtering, or the like.

As the material of the substrate, one of glass, plastic, and metal may be used, and a composite substrate of these may be used. In the case of metal or glass, it is best to apply an organic undercoat.

The present invention is also effective when rewriting records by crystallization or amorphization.

[Embodiments of the invention]

The present invention will be explained in detail below by way of examples.

Example 1 As shown in Fig. 1, a disk-shaped acrylic resin substrate 1 with a diameter of 30-1 and a thickness of 1 to 2 mm with grooves for tracking formed on the surface was placed in a vacuum deposition apparatus and rotated. At the same time, Parylene-Nf was first deposited to a thickness of about 600 nm from a deposition boat placed below the disk to form Layer 2. Next, Sb2Se3 is extracted from another vapor deposition boat.
A layer 3 having a composition of about 59 nm was deposited. Next, from another plurality of vapor deposition boats, approximately B 14oT e
A layer 4 (i: about 5 Qnm thick was deposited) having a composition of 4s S e + s.Furthermore, parylene-N' (r) was deposited again to a thickness of about 600 nm to form layer 5.Next, this disk was Take out from the vacuum evaporation equipment and coat PMMA with a thickness of about 2 μm.
Layer 6 was applied to a thickness of . 2 such discs
One sheet was made and bonded together with adhesive 7.

Recording on the disk formed as described above was carried out as follows. Rotate the disk at 5QQrpm,
The light from a semiconductor laser (wavelength: 820 nm) is kept at a level that does not allow recording, is focused by a lens in the recording head, and is irradiated onto the disk through the substrate. By detecting the reflected light, the center of the tracking groove and The head was driven so that the center of the light spot was always aligned. While tracking in this manner, automatic focusing was performed so that the focus was on the recording film, and recording was performed by increasing or returning the laser power to the original level in accordance with the t-information signal. I did all the work, jumping to other grooves as needed.

Recording is S bz S 83 layer and B i4o T
This was done by changing the ``atomic arrangement'' of the ``eu S exs layer''.

Bladder removal was performed as follows. 600r disc
pm, and while performing tracking and automatic focusing in the same way as during recording, the strength of the reflected light was detected using a laser power that would not be recorded, and the information was reproduced. In this example, an error rate of about I x 10-5 was obtained, and even in a one-month life test of 60 layers with a humidity of 95%, there was little change.

In this example, when the previously deposited parylene layer was omitted, the deformation of the recording film during recording became large, and the error rate was about 1X10-'. If the parylene layer deposited on the recording film is omitted, the error rate is 3X10-
' became. BizT instead of J3i-Te-8e film
When the EA layer was used, the error rate was 5 x 10-' in a life test of 60 layers at 95% humidity for one month.

A similar effect was obtained by adding KSb instead of 860 in the Bi-'J''e-Se layer, but some changes were observed in the 600 humidity 95% life test.

B i4o T e4s S exs layer instead of 9) 3
i 55 S b4s + T eso S e201
T e90 S elO and T e7o S b3
It was also possible to use a layer of composition o. The preferred content of one element among Se and Sb was 1% to 45%, and the more preferred content was 1 dlO% to 30%.

In this example, the 5bzSes layer and B14oTe4s
It was also possible to reverse the formation order with the SelS layer, but in that case, silicone resin was applied to a thickness of about 150 μm instead of PMMA, without bonding with other disks. Recording and reproduction were performed by entering light from the silicone resin side.

S'1) Te0x (0<x<2) for υ instead of 2861 layer
, In28e3, In283t, compositions similar to these, or those with other elements added to them can also perform similar recording.

Similar results were obtained when guanine or the like was vaporized instead of parylene.

〔Effect of the invention〕

When the film thickness of the high boiling point organic material layer such as parylene was 1100 nm or more, an error rate almost close to that of the above example was obtained;
The effect was also found in the range of 0 layer m to 1100 n. If these layers are made too thick, the flatness of the film will deteriorate, so
It was particularly preferable that the thickness be less than μm.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a recording member in one embodiment of the present invention. 1.1'...Substrate, 2,2'...Organic layer, 3,3
'...Inorganic layer, 4,4'... Inorganic layer, 5...
Organic layer, Figure 1

Claims (1)

[Claims] 1. In an information recording member used for forming a thin film on a predetermined substrate and irradiating the thin film with a double energy beam such as a laser beam to record information by a method that does not involve evaporation of the thin film. . An information recording member comprising two or more layers of the thin film, at least one of which is a layer containing an organic substance having a boiling point of 350C or higher as a main component.