JPS6163491A - Photo-recording element - Google Patents

Abstract

PURPOSE:To obtain a photo-recording element capable of highly reliable high- density recording by a method in which at least one of A-layer, B-layer, and a light absorptive layer is made up of the monomolecular film or its laminate film of constituent substances and a protective layer is further provided. CONSTITUTION:A laminate consisting of A-layer 2 of a color-forming compound, B-layer 4 of an auxochromic compound and a light absorptive layer 3 of a light absorptive substance which is provided between the A- and B-layers 2 and 4 is provided through the B-layer 4 on a substrate 1, and a protective layer 30 is formed on the A-layer 2. In such a constitution, at least one of the A- and B-layers and the layer 2, 4 and 3 is made up of the monomolecular film or its laminate film of constituent substances, and the other layer is formed of deposite films. By irradiation of infrared rays, the leuco dye of the a-layer is contacted with the phenolic compound of the B-layer and a chromogenic reaction is advanced to form color points at given positions. Information can thus be recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording device using an organic material, and in particular to a highly reliable and high-density recording optical device using a highly molecularly oriented organic thin film. This relates to recording elements.

[Prior Art] Recently, optical disks have been attracting attention as a central player in office automation (OA).

The reason for this is that a single optical disc can record (or store) a large amount of documents, literature, etc. Therefore, introducing an information storage device that uses this optical disc will revolutionize the organization and management of documents and literature in offices. It is something that brings. In addition, the recording element for the optical disk is inexpensive;
2. Description of the Related Art Elements made of organic materials that have features such as ease of manufacture and high-density recording are attracting attention.

Among the conventional techniques using such organic recording materials.

In particular, a two-component optical recording element that utilizes a color reaction caused by contact between a color former and an auxiliary colorant has been reported (Nikkei Sangyo Shimbun
18th IO, 1981).

, an example of the optical recording element will be explained based on the drawings.As shown in FIG. 2(a), a color forming agent layer 7 and an auxiliary color agent layer 5 are separated by a light absorption layer 5e and are laminated on a substrate l. It consists of the following configuration.

The coloring agent (leuco compound) and auxiliary colorant are colorless or light-colored when each exists alone.

When recording on the recording element, a laser beam 8 is irradiated onto a desired position of the light absorption layer 6 as shown in FIG. 2(b).
The portion of the light-absorbing layer that is irradiated with the laser beam absorbs the laser beam, melts, and rips, leaving a small hole.

As a result, as shown in FIG. 2(C), the color former and the auxiliary color remover, which were separated by the light absorption layer 6, mix through this small hole and develop a color. Information is recorded or stored in the form of coloring points 9, and reading is performed by scanning the recording element with another light source and detecting changes in reflectance, transmittance, etc. due to the coloring points.

[Problems to be Solved by the Invention] In the above-mentioned optical recording element, in order to achieve high recording density, it is desirable that the light absorption layer 6 be as thin as possible, flat, and without unevenness in film thickness. However, in conventional optical recording elements, the light absorption layer is coated on the substrate by, for example, a vacuum evaporation method or a spin coating method, so the thickness is reduced to 20%.
When attempting to thin the comb to a thickness of 0 to 500 A or less, pinholes tend to occur frequently, and the two components of the color former and auxiliary color come into contact with each other at the pinholes, resulting in a lack of reliability. Furthermore, since the molecular distribution and orientation within the film of each layer formed by the above-mentioned conventional coating method is random, light scattering occurs within the school due to light irradiation, and when viewed microscopically, each light irradiation The degree of chemical reaction that occurs at different times varies. Furthermore, the above-mentioned H-coverage method has drawbacks such as increasing the area of the substrate of the optical disc, causing unevenness in the H'2 thickness and uneven recording quality.

Therefore, as an optical recording element, it is desirable that the molecular distribution and orientation within the device be uniform, that there are no pinholes, and that the film thickness is uneven.It is also desirable that the film thickness be as thin as possible to achieve high recording density and high reliability. The present invention has been made in view of these demands. 1. An object of the present invention is to provide an optical recording element capable of highly reliable and high-density recording. 0. Another object of the present invention Another object of the present invention is to provide a large-area optical recording device, which is easy to manufacture and inexpensive.

[Means for Solving Problems J and [Production M] That is, undeveloped 11 consists of four layers consisting of a leuco form of a normally colorless or light-colored dye, and a phenolic compound that develops color when in contact with the leuco form of the dye. A light-absorbing layer made of a light-absorbing substance, and layers 5' and 5 that protect these layers.

This is a source #2 element characterized in that at least one layer among the B layer and the light absorption layer is made of a monomolecular film of a constituent material or a MIIQ composite thereof.

The present invention will be explained in detail below.

The optical recording element related to undeveloped IJI utilizes the color-forming reaction of 2rR and split threads, and more specifically, it utilizes the color-forming reaction between the leuco form of the dye and a phenolic compound that develops color when it comes into contact with the leuco form of the dye. It is something to do.

Therefore, the main fertilizer j2 element according to the present invention is Ae, which is usually made of a leuco-containing colorless or light-colored dye, and 1iij.
It basically consists of a B layer made of a phenolic compound that develops color when it comes into contact with the leuco form of the dye, a light absorbing layer made of a light absorbing substance, and a protective layer.

Examples of the four-layered normally colorless or light-colored leuco dye used in the present invention include triphenylmethane, fluoran, phenothiazine, auramine, spiropyran, etc., and specific compounds contained therein. The details are listed in Table 1.

Next, Be
Examples of the phenolic compounds include pt-butylphenol, α-naphthol, β-naphthol, phenolphthalein, bisphenol A, 4-hydroxydiphenoxide, 4-hydroxyacetophenone, 3,5
-xylenol, thymol, hydroquinone, 4-tert-butylphenol, 4-hydroxyphenoxide, methyl-4-hydroxybenzoate, catechol, 4-hydroxyacetophenone, resorcin, 4
-tertiary-octylcatechol, 4.4'-secondary-butylidenediphenol, 2.2'-dihydroxydiphenyl, 2.2'-methylenebis(
4-methyl-6-tert-butylphenol),
2,2'-bis(4'-oxydiphenyl)propane,
4.4'-isopropylidene bis(2-tert-
butylphenol), 4,4'-secondary-butylidene diphenol, pyrogallol, phloroglucin, phloroglucin carboxylic acid, and the like.

Next, the light-absorbing material used in the formation of the light-absorbing layer in the present invention may be any light-absorbing dye that absorbs infrared rays, such as a melting light-absorbing dye that melts by absorbing infrared rays, or Sublimable light-absorbing dyes that absorb infrared rays and sublimate, non-melting dyes, non-sublimating dyes, etc. can be used.

Examples of such light-absorbing dyes include metal phthalocyanines such as copper phthalocyanine and vanadium 7-thalocyanine, metal-containing azo dyes, acidic azo dyes, and xanthine colors such as fluorescein.

One feature of the optical recording element according to the present invention is that at least one layer among the A layer, the 8 layers, and the light absorption layer is composed of a monomolecular film of each constituent material or a J11 film thereof. Therefore, when Afi, Bfi, or a light absorption layer forms a monomolecular film or a cumulative film thereof, the leuco form of the dye, phenolic compound, or light absorption substance has affinity for appropriate sites within the molecule. It is necessary to use a derivative having larger wood groups, hydrophobic groups, or both groups.

Any commonly used hydrophobic group and parent tree group can be used, but preferred hydrophobic groups for 4. ), (Toji is carpoxylno, (
And that money Elj! (For example, cadmium j11) is preferable.

On the other hand, if the A layer, the B layer, or the light absorption layer does not form a monomolecular film or a cumulative film thereof, any film can be used as each layer as long as it is formed by a conventional coating method. Among them, for example, vaporized IJ film, coating film, immersion film, etc.
A layer consisting of a layer such as an i-film or a laminate is preferred.

In addition, the II thickness of the A layer and B layer is a monomolecular film or its cumulative I
In either case of using a Ti film or a deposited film, from 200A to 10. The preferred range is 1,000 people to 1 river.

On the other hand, the thickness of the light absorption layer is desirably in the range of 308 to 1,000 A, preferably in the range of 50 A to 200 A, when using Fist Molecule Sniff or one cumulative model thereof. When using a 111 membrane, t, ooo from 90 people
The preferred range is 1408 to 400 people.

In the present invention, the protective layer is used to protect the A layer, the B layer, and the light absorption layer, and the material for the protective layer is Si0
Dielectric materials such as No. 2, plastic resins such as polystyrene, and polymerizable LBH resins such as diacetylene derivatives are suitable.

In addition, the IIQ thickness of the protective layer is 200 A -10,0OO
The range of A is desirable, especially w from 500 to 2,000 people.
AVJJ is preferred.

In addition, the materials used for the substrate in the present invention include:
Semiconductor materials such as silicon, metal materials such as aluminum, preferably tempered glass, more preferably plastic materials such as acrylic (PNMA), polycarbonate (PC), polypropylene, polyvinyl chloride (PVC), polystyrene, and ceramic materials. is preferred.

As mentioned above, in the optical recording element according to the present invention, at least one of the light absorbing layers consisting of Am made of a leuco form of a dye, Be made of a phenolic compound, and a light absorbing substance is a monomolecular film or a light absorbing layer made of a constituent material. One of its characteristics is that it is composed of a cumulative film thereof.

As a method for creating a monomolecular film or a cumulative film thereof having such high molecular order and orientation, for example, ILaB
The Langmuir project method developed by Muir et al.
LB method) is used. The Langmuir-Prodgett method is
For example, in a molecule with a structure that has a parent wood group and a hydrophobic group in the molecule, when the balance between the two (amphiphilic balance) is maintained appropriately, the molecule will stand alone on the water surface with the parent wood group facing down. This is a method of creating a monomolecular film or a cumulative film of monomolecular molecules by utilizing the history of molecules. When the monomolecular layer on the water surface has the characteristics of a two-dimensional system and zero molecules are sparsely dispersed, the two-dimensional ideal gas equation, rIA=kT, is established between the area per molecule A and the surface pressure n. , resulting in a "gas film", where k is Portzmann's constant and T is the absolute temperature. If A is made sufficiently small, the intermolecular interaction becomes strong and becomes a two-dimensional solid "condensed film (or solid film)."The condensed film can be applied to the surface of supports of various materials and shapes, such as plastic substrates and glass substrates. Can be transferred layer by layer.

Next, the method for forming a monomolecular film or a cumulative film thereof of an organic molecule having both a hydrophilic group and a hydrophobic group which are a leuco dye, a phenolic compound, or a light-absorbing substance used in the present invention will be described in detail.

First, the organic molecule is dissolved in a volatile solvent such as benzene or chloroform, and this is formed into a monomolecular cumulative film as shown in Fig. 3 using a cylinder or the like. is spread on the aqueous phase 11 in the water tank IO.

As the solvent evaporates, the organic molecules develop on the water phase 11 with the hydrophilic groups 12 facing the water phase and the ai water 313 facing the gas phase.

Next, in order to prevent this precipitate (organic molecules) from freely diffusing and spreading over the aqueous phase 1, a partition plate (or float) 14 is provided to limit the area of development and control the state of aggregation of the membrane substance. Obtain a surface pressure (■) proportional to the aggregate state. This partition plate 14
It is possible to control the aggregation state of the film material by moving the surface area and reducing the developed area, gradually increasing the surface pressure, and setting the surface pressure n suitable for producing a cumulative film. By vertically raising and lowering the clean substrate 14 while maintaining this surface pressure, a single molecule +1u1B is transferred onto the substrate. The monolayer film 16 is manufactured in the following steps, and the monolayer film vIIPJ1
In step 7, by repeating the above operations, a monomolecular layer cumulative film having a desired cumulative vX number is formed.

For example, when the substrate 15 whose surface is lignophilic is pulled out of water in a direction across the water surface, a monomolecular WIG with the organic molecules hydrophilic 1 (1) facing toward the substrate 15 is formed on the substrate 15. As described above, When the substrate 15 is moved up and down, the monomolecular layer 1B is stacked one by one in each process.The direction of the film-forming molecules is reversed in the pulling process and the dipping process, so according to this method, the distance between each layer is A so-called Y-type film is formed in which the parent wood groups of the organic molecules and the parent wood groups and the hydrophobic groups of the organic molecules face each other (Fig. 4(a)).

The Y-type film is strong because the hydrophilic groups and hydrophobic groups of the organic molecules face each other.

In contrast, only when lowering the substrate 15 into the water,
There is also a method of transferring the organic molecules onto the substrate surface.

In this method, there is no change in the direction of the film-forming molecules even if they are accumulated, and in all layers, the hydrophobic groups are oriented toward the substrate 15.
When a film is formed (FIG. 4(b)), on the contrary, a M11!1 film is formed in which the parent base in all layers faces the substrate 15 side. :Call 1f and 6 (ffs411(c)
).

The Y-type film is obtained by transferring organic molecules to the substrate surface only when the substrate 15 is lifted out of the water.

The monomolecular film and monomolecular mRS formed on the substrate by the above method have high density and a high degree of order and orientation, and by forming the R layer with these films, A recording element capable of photothermal recording and having a high-density, high-resolution recording function can be obtained. Further, as can be seen from the principles thereof, these film forming methods are very simple methods, and a recording element having the above-mentioned excellent recording function can be provided at low cost.

The substrate on which the monomolecular film or monomolecular cumulative film in the present invention is formed is not particularly limited, but if a surfactant is attached to the surface of the substrate, when the monomolecular layer is transferred from the water surface, the monomolecular Since the film is disturbed and a good monomolecular film or monomolecular layer cumulative film cannot be formed, it is necessary to use a plate with a clean surface.

The monomolecular film or monomolecular layer accumulation film on the substrate is sufficiently strongly fixed and rarely peels or peels off from the substrate. An adhesive layer can also be provided between the layer stacks. Furthermore, the adhesion force can be strengthened by selecting the monomolecular layer formation conditions, such as the hydrogen ion concentration of the aqueous phase, the ion species, the water temperature, the rate of raising and lowering the carrier, or the surface pressure.

Next, the method for forming the deposited film of layer A, layer B, or light absorption layer is to use a ball mill or the like to prepare a water mixture in which a binder and water are added to the leuco form of the dye, phenolic compound, or light absorption substance. After pulverizing and mixing, it is applied onto a substrate or the like using a conventional method.

The binder used in the present invention includes gelatin,
Natural polymers such as starch, cellulose nitrate, cellulose conductors such as carboxymethyl cellulose, chlorinated rubber,
Semi-synthetic polymers such as natural rubber plastics such as cyclized rubber, polyisobutylene, polystyrene, terpene resins,
Polyacrylic acid, polyacrylic ester, polymethacrylic ester, polyacrylonitrile, polyacrylamide, polyvinyl acetate, polyvinyl alcohol, polyvinylpyrrolidone, polyacetal resin, polyvinyl chloride, polyvinylpyridine, polyvinylcarbazole,
Polymerizable synthetic polymers such as polybutadiene, polystyrene-butadiene, butyl rubber, polyoxymethylene, polyethyleneimine, polyethyleneimine hydrochloride, poly(2-acryloxyethyldimethylsulfonium chloride), phenolic resins, amino resins, toluene resins, alkyds Condensation polymerization type synthetic polymers such as resin, unsaturated polyester 4341Ft, allyl resin, polycarbonate, polyamide resin, polyether resin, silicone resin, furan resin, thiokol rubber, etc., addition polymerization such as polyurethane, polyurea, epoxy resin, etc. Examples include mold resin.

The method for forming the protective layer in the present invention can be any conventional method, and among these, preferred are plasma CVD, photoCvD, vacuum evaporation, sputtering, coating, and the like.

An optical recording element according to the present invention can be easily manufactured by sequentially combining the methods for forming each layer described above according to the intended structure.

Next, embodiments of the structure of the optical recording element according to the present invention will be shown below.

(I) FIG. 1(a) shows an example of an embodiment, in which the A layer 2. is made of a color-forming compound. A laminate consisting of a B layer 4 made of an auxochrome compound and a light absorption layer 3 made of a light absorption substance interposed between the A layer and the B layer, Bf; 4 is supported on a substrate l,
A protective layer 30 is provided on the A layer 2, and the layers are laminated in this order: substrate/B layer/light absorbing acid layer A/protective layer.

Furthermore, as another example, the A layer of the laminate may be supported on a substrate, and the A layer may be formed in the order of substrate/A layer/light absorption layer/B layer/protective layer, or the laminate may be stacked in two layers. The stack may be such that the bottom A layer or B layer is supported on the substrate and the protective layer is supported on the top B layer or A layer.

In the above configuration, at least one of the A layer, B layer, and light absorption layer of the single laminated body is made of a monomolecular film of each constituent material or a cumulative film thereof, and the other layers are formed of deposited films or the like. .

Specific examples thereof are as follows.

(1) The A layer, the B layer, and the light absorption layer are all monomolecular films or their cumulative M (hereinafter referred to as rl, B film) (2) The A layer, the light absorption layer are the LB film, and the B layer is the deposit Film (3) Light absorption layer, B layer is L
Blli, A layer is a deposited film (4) A layer, B layer is B11
1. The light absorption layer is a layer ＠ l film (5) A layer is I, B film, B layer,
The light absorption layer is a deposited film ([i) The light absorption layer is LBII! 2. The optical recording element according to the present invention has the following configuration: (7) The B layer is a deposited film, (7) The B layer is a deposited film, and the light absorption layer is a deposited film (CI). Since the structure is separated by a light absorption layer, by melting or sublimating the light absorption layer by infrared irradiation and creating holes at desired positions, the leuco form of the Afi dye and the phenolic compound of the B layer come into contact. A coloring reaction progresses, forming a coloring point at the position, and information can be recorded.

(II) Figure 1(b) shows the A layer 2 made of leuco dye
and eight layers 4 made of a phenolic compound, and further provided with a light absorption Nj3 on the B layer 4,
A light absorption layer 3 is supported on the substrate l, and a protective layer 30 is provided on the A layer z.
are provided and laminated in the order of substrate/light absorption layer/B layer/A layer/protective layer. In this case, the A layer 2 and the 8 layer 4 may be reversed, and the VI layer may be formed in the order of substrate/light absorption calendar/A layer/B layer/protective layer.

Furthermore, to show another example, as shown in ft51 diagram (C), A layer 2 and 8 layers 4 are laminated, and a light absorption layer 3 is provided roughly on the A layer 2 to form a laminate. Eight layers 4 are supported on a substrate 1, and are laminated in the order of substrate/B layer/A layer/light absorbing acid layer protective layer. In this case, as above, A52
and 8 layer 4 are reversed, and the substrate/A calendar/B layer/light absorption layer/
The layers may be laminated in the order shown in FIG.

Moreover, in any of the configurations shown in FIGS. 1(b) and 1(C), the above-mentioned laminate is installed twice! The protective layer may be provided on top of the top layer and supported on the substrate.

In the configuration of (II) above, at least one layer among the A layer, B layer and light absorption layer of the m carcass is made of a monomolecular film of each constituent material or a cumulative film thereof, and the other layers are formed of a deposited film. be done.

Specific examples thereof include (1) to (1) of the embodiment (r) above.
As stated in 7).

The base jit element having the configuration (It) above is constructed by bringing Am, which is a color-forming compound, and BW, which is an auxochrome compound, into close contact with each other, but it is impossible to configure it in this way with conventional technology. It was said that there was. However, in the present invention, since the A layer and/or the third layer are formed of a monomolecular film with a high degree of molecular order and orientation and a cumulative film thereof, The above configuration was made possible because the reactive sites could be separated from each other.

That is, color development occurs when the reactive site of the phenolic compound molecule and the reactive site of the leuco dye molecule come into contact, but when the reactive site of the molecule and the non-reactive site of the molecule (e.g. alkyl 130) No color reaction occurs upon contact with.

Therefore, a monomolecular film or a cumulative film thereof may be constructed such that the contact surface is composed of non-reactive sites of molecules.
The non-reactive sites constituting the contact surface may be those of molecules of phenolic compounds or leuco molecules of dyes - for example, hydrophobic sites (alkyl chains). A monomolecular film or a cumulative film thereof may be formed as a contact surface.

Further, the optical recording element according to the present invention having the above-mentioned configuration (IT) has the A layer and the B calendar '!'! Since it is constructed by laminating E-coated layers and providing a light-absorbing layer on the outside, the light-absorbing layer is heated by infrared irradiation, and A is heated by the heat conduction.
The leuco form of the dye in the layer and the heptanoyl compound in the three layers come into contact with each other under heat, and a coloring reaction proceeds, forming a coloring point at a predetermined position so that information can be recorded. In this case, non-melting dyes and non-sublimating dyes are suitable as the light-absorbing substance.

Therefore, the optical recording element according to the present invention can be mainly used as an optical disk.6 An example of an information storage device having an optical pickup optical system for writing or reading information from the optical disk As shown in the figure.

The information storage device is composed of a writing means consisting of a control circuit 27 and an optical pickup optical system, an optical recording element according to the present invention, and a reading means consisting of an output circuit 2B and an optical pickup optical system.

Writing is performed as follows. The control circuit 27 controls the oscillation of the semiconductor laser 28. Therefore, the input information is converted into an optical signal by the control circuit 27 and the semiconductor laser 2B. The optical signal 29 passes through the optical pickup optical system shown in Fig. WS5 and is imaged onto the recording layer of the optical disc 18 which is rotating synchronously, and is recorded in color by the above-mentioned coloring mechanism.

Reading is carried out as follows. A low-output continuous wave light emitted from the semiconductor laser 2B is used as the reading light. Since the output is low, color recording is not performed during reading. Alternatively, another visible light source may be used as the reading light source.

The reading light beam forms an image on the substrate surface of the optical disk 18 and is reflected, but since the reflectance differs between the coloring point and the non-coloring point, this reflected light is applied to the light receiving surface of the photodiode 25 through the optical pickup optical system. This converts the signal into an electrical signal and reproduces and reads it.

In order to increase the contrast of the reproduced signal and improve the image quality, it is preferable to provide a metal reflective layer such as aluminum on the substrate 1 of the optical recording element.The thickness of the metal reflective layer is 1,000 Å. ~2,000 A is preferred. In addition, a dielectric mirror may be used as necessary.

[Example] Hereinafter, the present invention will be explained in more detail by showing examples. In the following, unless otherwise specified, "part" means "part by weight" and "%" represents "1fL reed%".

Synthesis Example 1 (Synthesis example of light-absorbing substance) After mixing and dissolving 10 parts of vanadium muphthalocyanine urea and 1 part of a 10-15% phosphoric acid aqueous solution, 2 parts of phthalic anhydride and VOC! 12(
TogH (vanadyl salt) and 8 parts of a phthalic anhydride derivative represented by the formula (r) were added, and 100
It was heated at ℃ for 5 hours. After cooling, 2% diluted Na0)1
After adding 100 parts of an aqueous solution for hydrolysis, the mixture was separated by chromatography.

0.1 part of a target substance (vanadium phthalocyanine derivative) represented by formula (n) [in formula (1), R represents C-0-12H5 CH(CH2)79CH3] was obtained.

Synthesis example 2 (synthesis example of leuco dye) Listal pie ole lactone 1 expression (it) and 1 part of an intestine-ami7benzoic acid derivative represented by:

One part of Michler's hydrol represented by the formula (w) OH is added to 0□N ()
Nitrobenzene) mixed in the melt and cHQs as a catalyst
a, 1 part of H<para-toluenesulfone s) was added and refluxed for 8 hours to form a compound of formula (V) N CH.

(CH,),? CH3 A triphenylmethane derivative represented by was produced.

Next, the triphenylmethane derivative of the product was converted into lead dioxide (
1 part) after heating in the presence of sulfuric acid for 3 hours.

Formula (W) (OH,), 7C)! .

A crystal violet lactone derivative represented by was obtained.

Next, by adding an aqueous solution of caustic soda to this and cyclizing it.

Crystal violet lactone derivative represented by the formula (■) (CH2)z7''3 0.
Got 2 copies.

Synthesis Example 3 (Synthesis Example of Phenolic Compound) One part of the ortho-xylene derivative represented by phenolphthalein 1 (■)' (C)I2), 7CH, was heated using v205 (vanadium pentoxide) as a catalyst. Air (400℃-5
00°C), a phthalic anhydride derivative represented by the formula (Df) was obtained.

Next, 2 parts of phenol and an appropriate amount of H2SO4 were added to this and heated at 130°C to obtain 0.1 part of a phenolphthalein derivative represented by the formula (X).

Example 1 (1) Method for forming layer B A glass (disk) substrate mainly consisting of a disk with a thickness of 100 mm and a diameter of 180 mm was thoroughly cleaned. 77 parts of phenolphthalene, which is a hexagonal phenolic compound, and polyvinyl as a binder. Mix 1 part of alcohol and 4 parts of water and use a ball mill for several hours.

The phenolphthalein sediment FJ (M thickness IJL) dispersed in the binder was prepared by grinding and mixing and spin coating on the substrate.
) were obtained.

(2) Method for forming a light-absorbing layer Next, the light-absorbing material vanadium was added to the B layer formed on the glass substrate of each sample obtained in (1) above using the monomolecule accumulator described above. A monomolecular cumulative film of phthalocyanine derivatives was formed.

A monomolecular cumulative film of a vanadium phthalocyanine derivative was formed as follows.

After forming layer B, (with the plate perpendicular to the water surface), (after submerging the plate in water, add a vanadium phthalocyanine derivative to a chloroform solution with a concentration of 2 × 10° 1 mol/ml and add it to the water surface. The zero surface pressure for spreading the monomolecular film on the water surface was set to 30 dyr+e/cm, and the speed was 2 c.
m/mir+), (the plate was lowered L and a ?i molecule cumulative film (Y-type film) was created for each sample in which the ?i molecules were accumulated in each layer shown in Table 2.

(3) Method for Forming Layer A Next, a deposited film of crystal violet lactone, which is a leuco dye, was formed on the light absorption layer formed on the glass substrate of each sample in (2) above.

The formation method is to mix 7 parts of crystal bioleft lactone, 1 part of polyvinyl alcohol as noheingu, and 100 parts of water, and then grind and mix using a ball mill for several hours, and then spin-coat it on the light absorption layer of the substrate and add it to the binder. Dispersed crystal bioleft lactone deposit jliW2
A film thickness l) was obtained.

(4) Method of forming a protective layer Next, the A formed on the glass substrate of each sample in (3) above.
A 5i02 protective layer was formed on the layer by plasma CVD method.

The formation method is to hold the substrate on a substrate heating holder in a vacuum chamber of a plasma CVD reactor, and set the degree of vacuum to 2 x 1.
After exhausting to 0" Torr, raise the temperature and set the substrate temperature to 50℃, introduce SiH4 gas and 02 gas into the vacuum chamber at flow rates of 1105cc and 50SccM, respectively, and close the exhaust valve. mf!ri
The pressure was maintained at 0.2 Tarr. Afterwards.

13.58M) Iz high frequency 0.82X 1O-2W
/cm2(7) power density to form a film thickness of 1g on the substrate.
A 5i02 protective film of m was formed.

(5) Performance test An optical recording element related to unexploded jJJ manufactured by the method described above and a conventional similar structure T& as a comparative example (all constructed without using a protective layer and a monomolecular film or a multilayer film thereof) After recording on the optical disc according to f: using the information storage device shown in the fSS diagram under the following recording conditions.

The performance of both was compared by reading and reproducing.

(Recording conditions) Semiconductor laser wave & 830nst Laser output 6 to 9+*W Recording frequency 5 MHz Optical disk rotation speed 1,800 rpm or higher, readout was performed with a laser output of 1 mW, and the signal/noise ratio was calculated. Shown in Table 2.

Notes to Table 2: Comparative examples are shown, and each layer was formed by a spin coating method.

From the results in Table 2, when comparing test $4 No. 1 and test I No. 8, it is recognized that No. I has a significantly higher signal/noise ratio. Although the film thickness conditions are almost the same, the reasons for this difference in performance are: 1) No.1 has extremely fewer defects such as pinholes than No.1.

2) Since a protective film is provided, there is little external damage.

etc.

Comparing samples No. 2 to No. 5 and No. 8, N
It is recognized that signal/noise ratio is significantly higher for No. o, 2-No. 5. The reason why such a difference in performance occurs even though the film thickness conditions are almost the same is the same as the above-mentioned reason.

[Effect of the invention] As explained above, the optical recording element according to the uninvention has the A layer and the B layer.
At least one of the layers and the light absorption layer is composed of a single molecule 11 of the constituent material or a layer formed of a cumulative film thereof, and the ys retention layer is further provided.

It has the following excellent effects.

(1) Compared to optical recording elements that do not use conventional monomolecular films or their cumulative films, the signal/noise ratio is higher, and the reliability of recording can be improved.

(2) Physical defects such as pinholes in optical recording elements can be significantly reduced.

(3) Higher density recording is possible than with conventional optical recording elements.

(4) Large-scale construction of the original fertilizer M element is possible.

(5) If a structure is adopted in which the light absorption layer is not interposed between the A layer and the B layer, the color development efficiency and fidelity are improved.

(6) By adopting a configuration in which the light absorption layer is not interposed between the Afi and B layers, the recording layer can be made substantially thinner.

Higher density recording is possible.

(7) Materials that have good coloring efficiency and are excellent as coloring agents, etc., but are difficult to form a monomolecular film or a cumulative film thereof, or r
There is an advantage in that materials that are difficult to chemically change (synthesize) into derivatives that do not form Ti molecular films or their cumulative films can be used in the deposited film due to cost considerations.

(8) Since a deposited film is used in a part of the laminate, V:.

It has advantages in terms of optical properties, such as improved optical performance, a wider selection of materials, easier manufacturing, and easier discrimination between contrast and non-contrast during reading.

(9) Since the protective layer is provided, the A layer, B layer, and light absorption layer can be protected from external damage.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(C) are schematic cross-sectional views showing embodiments of the optical recording element according to the present invention, and FIG. 2(a) is
~ f52 Figure (C) is an explanatory diagram showing the recording process of a conventional optical recording element, Figure 3 is a schematic cross-sectional view of the monomolecular cumulative film forming apparatus, and Figures 4 (a) to 4 (C) are The manufacturing process diagram of the monomolecular cumulative film and FIG. 5 are block diagrams of the information storage device. 1.15...Substrate 2...A layer 3.6...
・Light absorption layer 4...8 layer 5...auxiliary color layer
7... Color former layer 8... Laser light 9.
... Colored light 10 ... Aquarium I + ... Water phase 12 ... Parent tree group 13 ... Hydrophobic group 14
...Partition plate IB...Monolayer film 17...
・Single molecule cumulative film 18... Optical disc 13...
Objective lens 20...1/4 wavelength plate 21...
Reflector 22...Collimating lens 23...
... Polarizing beam splitter 24 ... Lindrical lens 25 ... Photodiode 26 ... Semiconductor laser 27 ... Control circuit (signal control child) 28 ... Output circuit 29 ... Optical signal 30.
・Protective layer

Claims (1)

[Claims] (1) A usually consists of a leuco form of a colorless or light-colored dye
A layer B consisting of a phenolic compound that develops color upon contact with the leuco form of the dye, a light absorbing layer consisting of a light absorbing substance, and a protective layer protecting these layers,
An optical recording element characterized in that at least one of the A layer, the B layer, and the light absorption layer is composed of a monomolecular film of a constituent material or a cumulative film thereof.