JPS5933191A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To provide the titled recording medium having a high heat-insulating property and excellent in productivity and preservability, by a method wherein a heat-insulating layer consisting of gelatin, a gelatin derivative or the like capable of transmitting a laser light is provided between a recording layer absorbing a recording laser light and a laser light reflecting layer for reproduction. CONSTITUTION:Between the recording layer 4 capable of absorbing a recording laser light and comprising a color substance (e.g., colloid form particulates of a metal such as Cu, Ag) for converting laser light into heat and the reflecting layer generally consisting of a metal such as Al or Ag, the heat-insulating layer comprising a compound selected from the group consisting of gelation, gelatin derivatives, cellulose derivatives, PVA and polyvinylpyrrolidone as a main constituent, capable of transmitting laser light and having a thermal conductivity sufficiently lower than that of the substance used in the reflecting layer 2 is provided to obtain the objective recording medium. EFFECT:The heat-insulating layer can be applied in an aqueous system and is excellent in adhesive property for an adjacent layer.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording medium, and more specifically, the present invention relates to an optical information recording medium, and more specifically, a substrate has a layer that reflects laser light for reproduction, a layer that absorbs recording laser light, and a layer that absorbs recording laser light. The present invention relates to an optical information recording medium having a heat insulating layer □ that transmits a laser beam for use or recording. □ ・In a high-density recording medium for information using a laser beam that can provide high illuminance and short exposure, the information $a: can be directly read immediately after recording and without post-processing [DRAW-i (Direct
In recent years, the usefulness of media with ``Read Af't4r Write'e)'' characteristics has been actively pointed out in the fields of computers, data files, V, T, R, audio discs, reproduction recording media, etc. . Again-DRA
Many studies have been reported regarding W recording media materials. □ Many of the recording layers of conventionally known laser □ light recording media are made of Al, Rh, Au, or Cr-stopped reflective metal thin films, or non-crystalline metals such as Na, Au, and So. its oxide, or se”-Te-As, T'
It is a vapor-deposited thin film of a chalcogen compound such as 5i-As.

In many cases, information is recorded by irradiating these recording layers with a laser beam, melting and vaporizing the recording layer with the energy, and forming bits (four parts) based on the six principles. In the conventional optical information recording medium in which reproduction is performed using a reflection method, the reflectance of the pit portion formed in the recording layer becomes relatively small as compared to the unrecorded portion. Are known. □Meanwhile, when the laser beam for cows was irradiated again, the cows were on their knees.

The reflectance of the recorded part is relatively increased compared to the unrecorded part.Assuming one structure for one material, the reflectance of the recorded part is relatively small compared to the unrecorded part. Optical recording media are also known that attempt to improve the signal-to-noise ratio (SN ratio) and sensitivity when recording and reproducing information compared to the above-mentioned optical recording media.

The latter relates to an optical information recording medium in which the reflectance of the recorded portion is relatively increased compared to the unrecorded portion. , and examples of such recording media include F, W2. Spong U.S. Patent No. 4,097
, No. 895, the dye layer on the reflective layer supported by the substrate is melted and removed by laser light irradiation, and the reflectance of the bit portion formed is There is an optical information recording medium that is able to record information by being lifted up. In the above-mentioned U.S. patents of F, W, and Spong, the recording layer uses a non-crystalline metal such as Te or its oxide, and a low-melting point metal such as Ti, in addition to a dye that absorbs laser light. However, because it is manufactured by vacuum deposition, etc., it has problems such as being unsuitable for mass production and being unsuitable for environmental conservation.

□5 Kirani 1, Patent Application 1987-195580 1 includes a layer that reflects and reflects the reproduction laser beam, covers the reflective layer, and 1. reflects the recording laser beam at a high level. In an optical information recording medium having a thermal insulating layer that transmits both laser beams between a resin layer that absorbs laser light, the laser beam absorption layer is at least slightly activated. A trilogical information recording medium containing a colored substance and a polymerized substance that converts vinyl laser light into heat is described. Said patent application No. 195580/1986
In the recording medium described in the above publication, the laser beam-absorbing ru'M is formed by applying a solution in which a colored substance is dispersed in a buckwheat compound: Because of this, the recording media can be produced at low cost and in a continuous production line, and while being recorded, the media is harmless, has little or no deterioration due to oxidation, and has excellent preservation of recorded information. However, from the following points, there has been a demand for a recording medium with even better performance.

In such an optical information recording medium, which has a layer on the substrate that reflects the laser beam for reproduction, a layer that absorbs the laser beam for writing, and a thermal insulation layer that transmits the laser beam for reproduction or recording, the core The thermal insulating layer has a recording r (necessary energy value as low as possible) in the layer that absorbs laser light.
There are several important things that can be done. In other words, if the performance of the thermal insulating layer is poor, the energy of the recording laser beam will be taken away by other layers, resulting in the need for extra energy. This increases the energy value necessary for recording.・Above %
Gansho 56. As the material of the isolation layer described in Japanese Patent No. 195580, materials such as 5i02, MgF2, WO, etc., or transparent silicone resin 5. Bollier, Chilen,
Polyester and acrylic hydrocarbon polymers,
Organic materials such as fluorocarbons and resins made of polymers are used, and are provided adjacent to the reflective layer by vapor deposition, glow discharge, solution coating, or the like.

However, conventional materials such as SiO□ and acrylic hydrocarbon polymers (eg, polymethyl methacrylate) rarely have sufficient thermal insulation effects. That is, as there is an increasing desire to reduce the energy of the recording laser beam as much as possible, the conventional thermal insulation layer has insufficient thermal insulation effect, so it is necessary to reduce the energy of the recording laser beam as much as possible. The energy of the laser beam may not be as small as expected, and the energy of the laser beam may not be as small as expected.・There was a demand for something with a high insulation effect.

Also, some types of thermal insulation layer, □For example, acrylic acid□
Resin and acrylic hydrocarbon polymers (e.g. poly,
(acrylamide, etc.), the chemical properties of the material used for the thermal insulation layer, the application conditions, etc.
Adjacent, contacting anti-resistance layer (often a thin metal film is used).

(used) may corrode. Is this the point?
, et al.1 adjacent. Against, anti-layer, against, non-, active,
Sexual strength, excellent heat, absolute strength, desire, and desire were 6.・ ・Also, the traditional heat and insulation layer has problems when manufacturing it.
, had. ,. - That is, for example, using a vapor deposition method such as that disclosed in the above-mentioned US patent.

For emotional recording media, the vapor deposition method and glow discharge method are not suitable for mass production because they are batch-based manufacturing methods.

Furthermore, in the conventional patent application, for example, when a thermal insulating layer is formed by a coating method, due to the nature of the material, coating with an organic solvent (hereinafter referred to as This method often requires solvent-based coating (referred to as solvent-based coating), and there are many problems in terms of equipment, work environment, and waste liquid treatment.
Furthermore, in solvent-based coating, it is generally difficult to simultaneously coat 2I, for example, it is difficult to simultaneously coat a layer that absorbs laser light on top of a thermally insulating layer.

Even when using a coating whose main component is water (hereinafter referred to as water-based coating), conventional thermal insulation layer materials (for example, acrylic hydrocarbons described in Japanese Patent Application No. 56-195580) In the case of thread polymers), as mentioned above, the adjacent reflective layer was often corroded, which was not preferable.

In addition, conventional heat insulating layers, regardless of whether they are made by vapor deposition or coating, sometimes have insufficient adhesion to adjacent layers. When a laser beam absorbing layer containing a hydrophilic dispersion medium such as gelatin is provided adjacent to a thermally insulating layer made of an acrylic hydrocarbon polymer such as polymethyl methacrylate, the thermally insulating layer and The adhesion of the laser beam absorbing layer was insufficient and a gap was likely to be formed between the two layers, which was undesirable.

A first object of the present invention is to provide an optical information recording medium having a thermally insulating layer having a greater thermally insulating effect than conventional thermally insulating layers.

A second object of the present invention is to provide an optical information recording medium having an excellent thermally insulating layer that is inert with respect to adjacent layers, such as reflective layers.

A third object of the present invention is to provide an optical information recording medium having a thermally insulating layer that can be manufactured by water-based coating.

Fourth aspect of the present invention. The purpose of the present invention is to provide an optical information recording medium that has excellent adhesion between a thermally insulating layer and an adjacent layer.・・This invention・
The purpose of item 5 is to provide an optical information recording medium that is suitable for mass production, is harmless, has little deterioration due to oxidation, and has excellent pre-recording and post-recording storage properties.・
・・・ ・ .

The sixth object of the present invention is to achieve high sensitivity and S/N ratio during recording and reproduction.
The object of the present invention is to provide an optical information recording medium and body with excellent ratios.

The objects of the present invention are to provide a substrate with a layer that reflects a reproduction laser beam, a layer that absorbs an enhancement laser beam, and a thermal insulation layer that transmits a reproduction or recording laser beam;
``The thermal insulating layer is between the reflective layer and the laser light absorbing layer, and (2) the insulating layer is selected from the group consisting of gelatin and gelatin derivatives, cellulose derivatives, polyvinyl alcohol, or polyvinylpyrrolidone. This was achieved by an optical information recording medium characterized by containing at least one compound as a main component.
□、・The present invention will be explained in more detail. The material used for the thermal insulating layer according to the present invention has a sufficiently lower thermal conductivity than the material used for the layer that reflects the reproducing laser beam (hereinafter referred to as the reflective layer), and also substantially transmit light (e.g. at least 80
% or more) is preferable.

A thermal insulating layer that satisfies the above requirements is a thermal insulating layer whose main component is at least one compound selected from the group consisting of gelatin and gelatin derivatives, cellulose derivatives, polyvinyl alcohol, and polyvinylpyrrolidone. layers can be used. Here, "E is the main component" means that the compound accounts for 50% (weight) or more of the heat insulating layer.
Examples of cellulose derivatives include carboxymethylcetate/
Examples include I/P-su, hydroxyethylcellulose, and the like. ,.

As polyvinyl alcohol, saponification degree is 50% to 10
0% is preferable, especially saponification degree of 80% to 100%.
% is preferable from the viewpoint of solubility in water.

Polyvinylpyrrolidone has a number average □ molecular weight of 10. ooo = 360.000 is preferred. Also □Main 4* of polyvinylpyrrolidone
Alternatively, the side chain may have a substituent such as a halogen.

Gelatin and gelatin derivatives will be discussed later.
.

Above gelatin j.・One compound may be selected from the group consisting of a gelatin derivative, a cellulose conductor, polyvinyl alcohol, or polyvinylpyrrolidone,
In addition, two or more compounds from the same group or different groups are selected and used in combination.1. It's okay.

Particularly preferred among the above groups are gelatin and d-gelatin derivatives. Why is it that these gelatin and gelatin derivatives are used to form thermal insulating layers?
This is because there is very little chance of them mixing with each other. Furthermore, in the heat insulating layer formed of gelatin or a gelatin derivative, K is particularly preferable when the dispersion medium of the layer that absorbs laser light is a hydrophilic material.・
-12', -': General gelatin or gelatin derivatives can be used as gelatin and gelatin derivatives. @No particular restrictions. Some gelatins may include gelatin that has not been particularly treated or alkaline-treated gelatin. It includes gelatin, acid-treated gelatin, enzyme-treated gelatin, and other gelatins that have been subjected to some kind of treatment, as well as gelatin that has been subjected to acid treatment on the various gelatins mentioned above. Examples of gelatin derivatives include phthalated gelatin, dextran gelatin, and grafted gelatin.

Among gelatin and gelatin derivatives, 1. Especially good. Regarding the above-mentioned photographic gelatin paste, see ``The Theory of Photographic Iraqi Process'', 4th edition ('T, 'H, James, Macmillan Publishing, 1.
977) pp. 51-76, and [Basics of Photographic Engineering, Silver Halide Photography Edition] (edited by the Photographic Society of Japan, Coronasha, 1978)
The thermal insulating layer described above can be formed by water-based coating. Coating methods include - coating, spinner coating, dip coating, air knife coating, bead coating, and curtain coating. Coating, etc. may be used. Also, the above-mentioned thermal insulation f-
The film thickness when dried is 0.1μ, 10μ. 10
If it is less than 0 s, the thermal insulation effect will not be sufficient and recording energy will increase. In the case of a reproduction method using interference, the sum of the film thicknesses of the thermal insulating layer and the layer that absorbs the laser beam (referred to as the recording layer) is n 74 times the wavelength of the reproduction laser beam (n is an integer). ), the thickness of the thermal insulation layer is determined so that H
If an e-Ne laser (63, 28X) is used as a light source for reproduction, it is preferable that the film thickness is about 0.15μ.

The recording layer according to the present invention mainly consists of a colored substance that converts light into heat and a polymer compound as a dispersion medium. Heat is transmitted to the polymer compound, causing it to melt or blow
'off (blows off) Sister, p bit is formed.

The reflectance of the recording layer at the wavelength of the recording laser beam is:
It has the advantage that it is extremely small compared to vapor-deposited metal layers, etc., and the thermal conductivity of the coloring substance and the polymer compound as the dispersion medium is low, so it can be sufficiently recorded with low-output laser light. have Further, it has the advantage that it is not toxic like Te or old metals, has extremely high surface strength compared to dye-deposited films, and is easy to handle.・・・
.

The colored substance that converts light into heat and is contained in the recording layer according to the present invention is, for example, Cu, Ag, Au, Ni,
Pd.

Pt, Co1Rh,': Ir, , Fe,: Mn,
Colloidal metal fine particles such as Cr' and Ti; carbon-based substances such as carbon blank and graphite; inorganic pigments whose main constituent is salts of heavy metals; e.g. lead-based, iron-based, cadmium-based 1. : 7 Pigments such as parto-based, ultramarine blue, and navy blue, and organic pigments such as a, nthraquinone-based, anduron-based,
It is possible to use azo-based pigments, phthalocyanine-based pigments, etc.

The preferred type of metal when using the metal layer/□ particles as the coloring substance depends on the type of polymer compound as the dispersion medium and the particle size of the metal fine particles to be dispersed.]
One preferred embodiment is a recording layer in which fine Ag particles with an average particle size of 300λ are dispersed in 1/2 gelatin layer. The type of metal used here is not limited to one type, and it is also possible to use a layer in which two or more types of metals are mixed and dispersed as a recording layer.

Carbon black and graphite are also suitable coloring substances. As specific examples thereof, known ones can be preferably used, such as carbon black (#(9), #t40, #50).
(manufactured by Mitsubishi Chemical Industries, Ltd.).
, .

One of the dispersion media for dispersing the coloring substance is a water-soluble polymer compound, such as gelatin and gelatin derivatives, or a water-soluble synthetic polymer (such as polyvinyl alcohol, polyvinyl pyrrolid/polyacrylic acid copolymer). , polyacrylamide, etc.), sugar conductors (e.g., sodium alginate, starch derivative 'J), cellulose derivatives (e.g., carboxymethyl cellulose, hydroxyethyl morulose, etc.), colloidal albumin, casein etc. can be mentioned. Among them, gelatin, gelatin derivatives, or polyvinyl alcohol are preferred from the viewpoint of adhesion to the heat insulating layer. Further, when the water-soluble polymer compound is used as a dispersion medium, the coloring substance is preferably the metal fine particles described above.

The other polymer compound as a dispersion medium for dispersing the coloring substance is a thermoplastic resin with a suitable softening point, preferably 10'C to 200'C higher than room temperature (20 to 30°C). It is desirable that the recording layer has the following:
It is desirable that the thermoplastic resin has suitable binding properties between particles of the coloring substance. □The thermoplastic resin is a granular dispersion medium, preferably in the form of an emulsion,
The thermoplastic resin in the form of an emulsion may have any particle size, but particles with a particle size of 10λ to 1μ, preferably 5
It is desirable to have a particle size of 0X to 5000λ. Thermoplastic resins with such characteristics include polystyrene, polymethyl methacrylate, polyethyl methacrylate, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyacrytetranitrile, polyvinyl alcohol, or vinyl groups or vinylidene groups. Polymeric substances such as polymers or copolymers of monomers having the same properties, various ionomer resins, etc. can be used.
Among these thermoplastic resins, copolymers of beachloride, den, and acrylic tolyl exhibit particularly good properties as recording media. It is provided in the form of a water-soluble or oil-soluble emulsion, but especially when a water-soluble emulsion is used, water-based application is possible. □It is industrially advantageous.

・If the dispersion medium is a thermoplastic phase or fat, water-soluble polymer compounds,
It can be seen that adding substances has an effect, but thermoplastic,
,, Resin 1 Contains water-soluble polymerized metal material ■ Since the sensitivity tends to decrease, the amount added is 1 l-i,
The water-soluble polymer compound must be kept to a small amount of water, and the water-soluble polymer compound may be a water-soluble synthetic polymer compound such as polyvinyl alcohol, polyvinylamine, polyethylene oxide, or gelatin, glue, or casein. Natural or modified natural water-soluble polymers such as M hydroxyl circenosolose and carboxymethyl cellulose can be used. The amount added is preferably 1=1 or less in weight ratio to the thermoplastic resin. - Self-oxidizing metal compounds, such as methyl cellulose, ethyl cellulose, Nido-rh cellulose, hydroxybrobyl methyl cellulose, cellulose acetate cellulose, can be used as further polymer compounds for dispersing the coloring substance in the recording layer according to the present invention. -1□ Suacetate butyrate, hydroxybrobylmet
□Chill cellulose phthalate, cellulose shea♀te
Kl! I don't have it. Among these autooxidizing compounds, ', 'Eito: cellulose or hydrogel methyl '□1:* A/ 0-X fl
ni&l? tUb-・, □:.

Thermoplastic resin or self-oxidizing compound as a dispersion medium
When it is set to 1, the above-mentioned carbonaceous substances, inorganic pigments and organic pigments are preferable as the above-mentioned coloring substances.

The recording layer according to the present invention includes 1. As a dispersion medium, water-soluble polymer compounds, thermoplastic resins'-mulsions, and self-oxidizing compounds for INN groups, coloring substances 0.001
Mix at a weight ratio of ~10.00 parts by weight, preferably 0.1 parts by 10 parts by weight, and if necessary add 1. After adding a plasticizer or surfactant, etc., it is uniformly dispersed by means such as bow milling or ultrasonic dispersion, and then applied to the heat insulating layer. Coating, dip coating, air knife coating, bead coating, curtain coating, etc. can be used, and the film thickness is in the range of 0.05μ to 1μ, particularly 0.05μ.
It is preferably about 0.5μ. That is, if it is less than 0.05 μm, it is difficult to obtain a stable thin film, while if it exceeds 1 μm, it is too thick and the recording energy becomes large, which is not practical.

2. A water-soluble organic polymer compound is used as a dispersion medium in the recording layer in terms of adhesion with the heat insulating layer. Particularly preferred. □・' An optical information recording medium that uses metallic colloidal fine particles as a colored substance that converts light into heat is based on a suitable substrate for polymer/molecular smelting in which nuclear colloidal fine particles are dispersed. However, in order to increase the strength of the film and reduce the thickness of the film, it is possible to harden the film by subjecting it to heat treatment in steps 1 to 1 to increase the film strength and reduce the film thickness. A radiation method is preferable so that the heating can be performed uniformly over the entire surface of the recording layer, but a heating method using a convection oven or a contact heat source may also be used. The heating temperature and heating time are selected so as to minimize the increase in reflectance due to contraction and hardening of the recording layer, and are typically 250° C. for 3 minutes, although they vary depending on the dispersed metal.

The heating atmosphere is a normal pressure trench or a reduced pressure trench, and unless it is necessary to suppress the oxidation reaction of the dispersed metal, the heating treatment is performed in oxygen-containing air.

The reflectance of the surface of the recording layer is preferably at most 10%, preferably at most 10%, and the optical density is at least 13%.・
It is desirable that it be 0 or more, 1.2.

In order to protect the information recording medium according to the present invention, it is also useful to provide a protective layer made of an inorganic material such as 5i02 or an organic material made of a natural or synthetic polymer.

Recording on the information recording medium according to the present invention is performed, for example, as follows. That is, in the case of recording, bits (
A record is recorded by making a hole (opening hole). Reproduction is performed by irradiating a reproduction laser beam, but at this time, the reflection of the laser beam at the focused area is a reflection of the lower layer and the layer surface, so it does not affect other unirradiated areas. Compared to this, it is relatively thick and has a diameter of 1. Therefore, S during playback with high sensitivity
It is assumed that reflective reading of information records with a large /N ratio is possible.

The a@ of the laser used here is determined by the spectral absorption characteristics of the recording layer containing a colored substance, but for example, He-Ne SH with an output of several milliwatts to several tens of milliwatts.
A gas laser such as e-Cd, an ion laser such as Ar or Kr, or a cow conductor laser is used.

jI@).

The substrate 1 may be made of any material as long as it has excellent surface smoothness and dimensional stability, and specific examples include glass, metal, ceramics, natural or synthetic resin, etc.
However, they may be transparent, translucent, or opaque/transparent.

, a reflective layer 2 adjacent to the substrate 1 . will be established. The reflective layer 2 reflects a small portion of the incident light having the wavelength of recording and reproducing laser light, and generally has a high reflectance.
1. , , is formed from a metal, such as AgζAu.

The reflective layer 2 is deposited on the substrate 1 by vacuum deposition to a film thickness of 0.02A, . .

A thermal insulation layer 3 is provided on the reflective layer 2. The heat insulating layer 3 is a thick layer in order to reduce recording energy on the recording layer 4.
The thermal conductivity is sufficiently small compared to W, -7 the light,
In particular, it has a property of substantially transmitting light having the wavelength of a reproduction laser beam. The thermal insulation layer 3 is formed from one or more compounds selected from each of the above-mentioned groups, such as gelatin or gelatin derivatives, by water-based coating. The film thickness when dry is 0.01 μ to 10 μ.
, yo... 1, do it. .

A recording layer 4 is provided adjacent to the thermal insulation layer 3.

The recording layer is formed by coating, for example, water-based coating, a colored substance that converts light into heat, such as colloidal silver, dispersed in a polymer compound as a dispersion medium, such as gelatin or a gelatin derivative. Film thickness is 0.05 when dry
Make it so that it is μ ~ 0.5μ.

FIGS. 2 and 2 are cross-sectional views of the optical information recording medium shown in FIG. 1 after recording with a laser beam and quenching. 5 indicates a bit formed by a portion of the recording medium being blown off by the laser beam.
- Furthermore, the recording medium according to the present invention may have a recording layer 4, a thermal insulating layer 3, and a reflective layer J-2 stacked in this order from the substrate side as shown in FIG. In this case, it is preferable that the substrate 1' be substantially transparent to the recording or reproducing laser beam.

The optical information recording medium according to the present invention had the following characteristics. The optical information recording medium according to the present invention includes:
The optical information recording medium has an excellent thermal insulation layer that has a greater thermal insulation effect than conventional thermal insulation layers and is inert to adjacent layers, such as reflective layers. Further, the heat insulating layer of the optical information recording medium according to the present invention can be manufactured by water-based coating, which is advantageous in terms of manufacturing method.

Furthermore, the recording medium according to the present invention was an optical information recording medium that had extremely excellent adhesiveness between the thermal insulating layer and the adjacent layer, as will be clear from the examples.

Further, the recording medium according to the present invention is suitable for mass production, is harmless, has little deterioration due to oxidation, and has excellent storage stability before and after recording. Further, the recording medium according to the present invention had high sensitivity and an excellent S/N ratio during recording and reproduction.

Hereinafter, the present invention will be explained specifically and in detail with reference to Examples, but the present invention is not limited to these Examples, and can be implemented in various ways within the scope of the idea of the present invention. □Yes.

In the examples, "~%j" means -% by weight.
represents.

Still, reproduction signal contrast 1 in the example,
The ratio is reproduction 1/- the reflection efficiency of the light, and takes a value in the range of 0 to 1, with values ranging from large to large.
The reflection efficiency is considered to be good as the threshold increases, and is preferably 0.3 or more, preferably 0.5 or more, and is defined by the following formula.

Io: Reflected light intensity in the recorded part ・ 1■r; Reflected light intensity in the unrecorded part, "'"゛ □--
- Excellent smoothness. AI on a 1.6mm thick glass substrate
:・1 The reflective layer is coated with a film thickness of approximately 0.02μ.
At 0 Torr:'.

-1 vacuum deposition 1, on which osseic acid treated gelatin 1:.

))-: A 10% aqueous solution of is coated with a bar and the film thickness is 0. ．． A sample was obtained with a thermal insulation layer of 5, μ.・・Problem: A bar of aqueous solution was applied. . The dispersion, liquid, AgNo., is obtained by reducing the colloidal silver particles on the sample with dextrose, latin dispersion, and the weight ratio of silver to gelatin is 32%, and the colloidal silver particles The grain size and diameter were measured at 300X. Dry film thickness is approx. 11.5
The transparent yellow dispersion layer with μ is heated at 250°C for 3 minutes using a far-infrared radiant heater.* i: e
4p=*・: Here, the adhesion between the heat insulating layer made of gelatin and the recording layer made of an aqueous gelatin dispersion solution of colloidal square silver particles was good.

A sample of the recording medium according to the present invention produced as described above was rotated at a linear velocity of 5@/sB·, and a He-N'e gas laser with a diameter of 1.4μ was applied to the recording surface at a power of 10 mW. □Recording was performed using light (6328X) (this laser light is referred to as a recording laser light). Incoming signal is 2MHz
The laser beam was modulated by an acousto-optic modulator using a rectangular wave signal. □ Reproduction was performed using the same optical system as used during recording and a He-Ne laser beam with a power of 1.5 mw, and the reproduction signal contrast ratio was 0.75%.
I got the value.

Note that the reproduced signal contrast ratio is: -Bit portion This good reproduced signal corresponds to an SN ratio of 5QdB or more in recording and reproducing information such as a video signal.

Example 2 A heat insulating layer was manufactured in the same manner as in Example 1, and a 1.0% aqueous solution of polyvinyl alcohol (7) was coated as a heat insulating layer with a film thickness of 0.5. A sample with a heat insulating layer of μ was obtained, and showed good results as in Example-1.
. , ・
・Actual hiff fIJ 3 Approx. 0 on a 1.6 mm thick glass substrate with excellent smoothness
．． The Ag reflective layer was coated with a thickness of 0271, lOT, or
A sample was obtained in which a 10% aqueous solution of osseic acid-treated gelatin was applied using a spinner, and a heat insulating layer having a thickness of 0.1 μm was provided.

A silver iodobromide emulsion with an average grain size of 300× for precision photography was coated on the sample to give a dry film thickness of 0.2 μm, 27- appropriate exposure was given, and development was carried out. After normal photographic operations such as fixing, a gelatin II matrix containing filamentous blackened silver was provided.・Light 1 of the layer (recording layer) that absorbs the laser beam
The medical concentration was 04.

Recording and reproduction were performed using the same recording device as in Example 1, and a good reproduced signal contrast ratio of 0.85 was obtained.

Example 4 Layer absorbing laser light
An emulsion layer containing photosensitive copper halide as a main component and having a composition of O,'9 IO,1 is provided by an appropriate coating method so as to have a dry film thickness of 0.2 .mu.m. After proper exposure, the film was developed for 10 minutes with a methol-L-ascorbic acid developer and fixed to obtain a dull copper surface with a reflectance of 6%. The recording layer is a fine particle mixed and dispersed layer containing Cu and Ag in gelatin.

Recording and reproduction were carried out using the same recording and reproduction apparatus as in Example 1, and a good reproduction ratio and contrast ratio of 0.75 fi was obtained.

Example 5: Manufactured in the same manner as Example 3 except for the layer that absorbs laser light,
I'd fine particles with a diameter of 2.00 K were dispersed on the heat insulating layer, and a diethylene glycol dimethyl solution of lysine copolymer was coated with a 0.1μ
What is the layer (recording layer) that absorbs the laser light?

Recording and reproduction were performed using the same recording and reproduction apparatus as in Example 1, and a good regenerated signal contrast ratio of 0.8 was obtained.

Example 6 A dispersion liquid having the following composition was applied onto the heat insulating layer, except for the layer (recording layer) which absorbs laser light and was manufactured in the same manner as in Example 3.

[Dispersion liquid composition for recording layer] - Purified water
30.739 The composition consisting of the above-mentioned Judobidai was dispersed for 5 minutes using an ultrasonic dispersion machine, and then applied to give a dry film thickness of 0.2 μm.
□ Recording and reproduction were carried out using the same recording and reproduction apparatus as in Example 1, and a good reproduction signal contrast ratio of 0.75 was obtained.

Example 7 Optical information was recorded in the same manner as in Example 1, except that as a thermal insulation layer, a 2% aqueous solution of hydroxyethylcellulose was spin-coated onto the reflective layer to give a thickness of 0.2 μnt. When a medium was prepared, good results were obtained for this sample as well as in Example 1, with reproduction signal co'> trust ratio' being 0. It was '70.

Example 8 An optical information recording medium was prepared in the same manner as in Example 1, except that a 1% aqueous solution of polyvinyl vinyl and rubirolidone (number average particle amount: 25.00) was coated with a spinner to a thickness of 1 μm. When the sample □ was prepared, good results were obtained as well as in the example, and the reproduced signal contrast ratio was 0,
It was 75.

[Brief explanation of the drawing]

1 and 3 are optical information diagrams according to the present invention, 1
and 1.substrate, 2 is a reflective layer, and is a 341Qf diagram. +→-. , a thermal insulating layer, 1it (recording layer) that absorbs 4 laser beams, 5 indicates a recorded focus, and 6 indicates an unrecorded portion surface. . Agent Yoshimi Kuwahara □ :: ”' jl - Procedural amendment (method) % formula % 2 Name of invention Optical information recording medium 3 Relationship to the case of the person making the amendment Patent applicant address 1 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. 26-2 Name (+27) Konishiroku Shasei Kogyo Co., Ltd. Representative Director Nobuhiko Kawamoto 4, Agent Address: 191 Hinokanakura-cho, Tokyo] Keiji Konishiroku Shasei Kogyo Co., Ltd. Chouchi 1982 November 12, 1983 (Shipping date: November 1982)
6. Subject of amendment:) Detailed explanation column of the description
:11) Brief explanation column of drawings in the specification, stomach:111)
Drawing 1:”
@"zcr>pg - 1) The detailed explanation column of the specification is corrected as follows. (1) [...good. (1st to 3rd "rounds" is changed to " ...Good. (1st to 5th medical examination) Revised 1
'(2) In the 11th line of page 2, change "Figure 2 and Figure 2'□'j', □Correct. is..." to "Figure 2 and Figure 4 are..." (:
I am corrected. 11) Book □. . . □. □. Change “Figure 2′” in the column (Engineering, Part 1, page 31) to “Figure 4”.
1. Correct "Figure 3'" to "Figure 5".
! :111) Correct the drawing as shown in the attached sheet. -2= Figure 5.

Claims (1)

[Claims] The substrate has a layer that reflects the laser beam for reproduction, a layer that absorbs the laser beam for recording, and a heat insulating layer that transmits the laser beam for reproduction or recording, and the thermal insulation layer has the reflective layer and the laser beam. and a layer that absorbs light, and the thermally insulating layer contains at least one layer selected from the group consisting of gelatin and seratin derivatives, cellulose derivatives, polyvinyl alcohol, or polyvinylvirolydone.
Optical information characterized by having a compound as the main component□
recoding media.