JPS6137480A - Optical recording element - Google Patents

Abstract

PURPOSE:To obtain optical recording elements having high reliability and high packing density by laminating a layer A of color-forming compound and a layer B of assistant color-forming compound with a light-absorbing layer provided, the layer B and the light-absorbing layer being formed with either a monomolecular film or an accumulated film respectively. CONSTITUTION:A layer-A 2 of color-forming compound and a layer-B 4 of assistant color-forming compound are laminated and further a light-absorbing layer 3 is provided on said layer-B 4. The layer-B 4 and the light-absorbing layer 3 are laminates of monomolecular film or its accumulated film and the layer-A 2 is a laminate of laminated films. The light-absorbing layer 3 is supported on a substrate 1 and the substrate, light-absorbing layer, layer B and layer A are laminated in that order. Consequently, compared to the conventional light-absorbing element, the titled element has higher packing density and also higher signal/ noise ratio, thus enhancing recording reliability.

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 storage device for 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 using this optical disc will revolutionize the organization and management of documents and literature in offices. It is expected that this will bring about results. In addition, organic materials, which have characteristics such as low cost, ease of manufacture, and high-density recording properties, are attracting attention as recording materials for optical discs.

Among the conventional techniques using such organic recording materials, a two-component optical recording element that utilizes a coloring reaction caused by contact between a coloring agent and a periodizing agent has been reported (Nikkei Sangyo Shimbun, 1972).
1aO) - An example of the conventional optical recording element will be explained based on a drawing. As shown in FIG. It consists of a structure in which they are separated and stacked on a substrate l.

The coloring agent (leuco body) and the stabilizing agent 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 coloring agent and the time-setting agent, which were separated by the light absorption layer 6, mix through the small holes 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%.
If an attempt is made to make the film thinner than 0 to soo A, pinholes are likely to occur frequently, and the two components, the coloring agent and the stabilizing agent, come into contact with each other at these pinholes and develop color, resulting in a drawback of 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 film with light irradiation, and when viewed microscopically, each light irradiation The degree of chemical reaction that occurs differs each time. Furthermore, the above-mentioned coating method has drawbacks such as unevenness in film thickness and uneven recording quality when the substrate of an optical disk has a large area.

Therefore, as an optical recording element, it is desirable that the molecular distribution and orientation within the film be uniform, that there are no pinholes, and that the film thickness is uniform, and 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, and an object of the present invention is to provide an optical recording element capable of highly reliable and high-density recording. It is an object of the present invention to provide an optical recording element that is easy to manufacture and inexpensive.A further object of the present invention is to provide an optical recording element with a large area.

[Means for Solving the Problems] and [Operation] That is, the present invention consists of a layer A consisting of a color-forming compound that is usually colorless or light-colored, and a layer B consisting of an auxochrome compound that develops a color when it comes into contact with the color-forming compound. (a) the layer B is a monomolecular film of an auxochromic compound or a cumulative film thereof; and (b) the light absorption layer is light-absorbing. An optical recording element characterized by comprising a layer consisting of a monomolecular film of a substance or a cumulative film thereof.

The present invention will be explained in detail below.

The optical recording element according to the present invention has a structure in which a layer A consisting of a usually colorless or light-colored color-forming compound, an auxochromic compound that develops color when in contact with the color-forming compound are laminated, and a light-absorbing layer is further provided. Become. Basically, it is required to use a combination of substances that develop color when brought into contact with and mixed with each other in the A layer and the B layer. Specific examples of the normally colorless to light-colored color-forming compound in layer A and the auxochrome compound that develops color when they come into contact with the color-forming compound in layer B, which have such a relationship, are as follows: (a) Acidic substance (layer B) and a leuco form of a dye (dye precursor) that develops color when it comes into contact with the acidic substance (layer A) (b) An oxidizing agent (layer B) and a leuco form of a dye that develops a color when it comes into contact with the oxidizing agent CA layer ) (c) Reducing agent (layer B) and a leuco form of dye that develops color when it comes into contact with the reducing agent (layer A) (d) Reducing agent (layer B) and is reduced like ferric stearate Examples include an oxidizing agent (layer A) that develops a color, (e) an oxidizing agent (layer B), and a reducing agent (layer A) that develops a color when oxidized, such as gallic acid. Let me give you a more detailed example.

Acidic substances in the B layer that react with the leuco form of the dye and develop color include aromatic sulfonic acid compounds such as benzenesulfone, aromatic carboxylic acids such as benzoic acid, palmitic acid (C+5Hit C00) I), and stearin. acid C
C+7 Ha5 GODH), Araxic acid (c,?)
! , decoon), higher fatty acid carboxylic acids, p-t
Examples include phenolic compounds such as -butylphenol, α-naphthol, β-naphthol, phenolphthalein, bisphenol A, 4-hydroxydiphenoxide, and 4-hydroxyacetophenone.

Next, examples of the leuco type of AD dye that reacts with the acidic substance include triphenylmethane type, fluoran type, phenothiazine type, auramine type, spiropyran type, etc. Details of the compounds are shown in Table 1.

In the present invention, since layer B is formed from a monomolecular film or a layer consisting of a cumulative film thereof, the above-mentioned auxochrome compound introduces a parent group, a hydrophobic group, or both groups at appropriate sites within the molecule. It is necessary to use derivatives that are

Any commonly used hydrophobic group and parent tree group can be used, but particularly preferred hydrophobic groups include long-chain alkyl groups having 5 to 30 carbon atoms;
As the parent group, carboxyl groups and metal salts thereof (eg, cadmium fn) are preferable.

On the other hand, Am may be any film formed by a conventional coating method, and among these, a layer made of a deposited film such as a vapor deposited film, a coating film, a immersed Vt film, or a laminate is preferable.

Note that the thickness of the A layer and the B layer is preferably in the range of 200A to 10JL, preferably in the range of 1.00OA to IL.

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 can also be used, but non-melting dyes and non-sublimating dyes are particularly preferred.

Examples of such light-absorbing dyes include metal phthalocyanines such as copper phthalocyanine and vanadium phthalocyanine;
There are xanthine dyes such as fluorescein.

Since the light-absorbing layer is formed from a monomolecular film or a layer consisting of a cumulative film thereof, the light-absorbing substance has a parent group, a hydrophobic group, or both groups introduced at appropriate sites within the molecule. It is necessary to use derivatives.

Any commonly used hydrophobic group and parent tree group can be used, but particularly preferred hydrophobic groups include long-chain alkyl groups having 5 to 30 carbon atoms;
As the parent group, carboxyl groups and metal salts thereof (eg, cadmium salts) are desirable.

The thickness of the light absorption layer is desirably in the range of 30A to 1,000A, preferably in the range of 50 to 200A.

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 acrylic (PMMA),
Preferred are plastic materials such as polycarbonate (1'C), polypropylene, polyvinyl chloride (PVC), and polystyrene, and ceramic materials.

In the optical recording element according to the present invention, the B layer is composed of a monomolecular film of an auxochrome compound or a cumulative film thereof, and the light absorbing layer is composed of a monomolecular film of a light absorbing substance or a cumulative film thereof. One of its characteristics is that

As a method for producing a monomolecular film or a cumulative film thereof having such high orderliness and orientation of molecules, for example, 1. La
The Langmuir-Prodgett method (LB method) developed by Ngmuir et al. is used. The Langmuir-Prodgett method uses, for example, a molecule with a structure that has a hydrophilic group and a hydrophobic group within the molecule, and when the balance between the two (balance of amphiphilicity) is maintained at an appropriate level, the molecule has a parent group on the water surface. This is a method of creating a monomolecular film or a cumulative film of monomolecular molecules by using the fact that the film turns downward into a monomolecular layer. 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, rlA=kT, is established between the area per molecule A and the surface pressure ■. where k is Portzmann's constant and T is the absolute temperature.If A is made sufficiently small, the intermolecular interaction becomes strong, resulting in a two-dimensional solid condensation l19 (or solid film). °.The condensation film is a plastic substrate,
It can be transferred layer by layer onto the surface of carriers/bodies having various materials and shapes, such as glass substrates.

Next, a method for forming a monomolecular film of an organic molecule or a composite JA film thereof having a parent group, a hydrophobic group, or a parent group, which is an auxochrome compound or a light-absorbing substance used in the present invention, will be described in more detail.

First, the organic molecule is dissolved in a volatile solvent such as benzene or chloroform, and then formed into a monomolecular layer i? [Developed on the aqueous phase 11 in the water tank io of the film forming apparatus.

As the solvent evaporates, the organic molecules develop on the aqueous phase 11 with the parent tree groups 12 facing the water phase and the water groups 13 facing ψ toward the gas phase.

Next, a partition plate (or float) 14 is installed to prevent this precipitate (organic molecules) from freely diffusing and spreading on the aqueous phase 11.
is provided to limit the developed area and control the state of aggregation of the membrane material, thereby obtaining a surface pressure (2) proportional to the state of aggregation. The partition plate 14 is moved to reduce the developed area, control the aggregation state of the film material, gradually increase the surface pressure 1, and set the surface pressure suitable for producing a cumulative film. By gently moving the clean substrate 14 vertically up and down while maintaining this surface pressure, the monomolecular file is transferred onto the substrate. The monomolecular film 16 is manufactured as above, and the monomolecular layer cumulative 11917
By repeating the above operations, a desired cumulative number of monolayer films taWi are formed.

For example, when a substrate 15 with a hydrophilic surface is pulled out of water in a direction transverse to the water surface, parent wood groups of the organic molecules are removed from the substrate 15.
A side-facing monolayer 16 is formed on the substrate 15 . When the substrate 15 is moved up and down as described above, the monomolecular layer 18 is stacked one by one in each step. Since the direction of the film-forming molecules is reversed in the pulling step and the dipping step, this method In this case, a so-called Y-type film is formed in which the parent wood group and the hydrophilic group of the organic molecule and the hydrophobic group and the hydrophobic group of the organic molecule face each other (Fig. 4 (, 11)).

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 the hydrophobic groups in all layers face the substrate 15 x)
! When the Xl film is formed (Fig. tJS4 (b)), on the other hand, in all layers, the parent base is oriented toward the substrate 15 side.
One film is called a Z-type film (Fig. 4(C)).

Z-type nQ is obtained by transferring organic molecules to the substrate surface only when the substrate 15 is pulled out of water.

The monomolecular film and monomolecular layer cumulative film formed on the substrate by the above method have high density and a high degree of order and orientation, and by configuring the recording layer with these films, photothermal Accordingly, it is possible to obtain a recording element having a high-density and high-resolution recording function capable of performing digital recording. 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 monomolecular film or monomolecular layer in the present invention described above
! The substrate on which the Ii film is formed is not particularly limited, but if a surfactant is attached to the surface of the substrate, the monomolecular layer will be disturbed when the monomolecular layer is transferred from the water surface, resulting in a good monomolecular film or monomolecular layer accumulation. Since no film is formed, it is necessary to use a substrate 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. It is also possible to provide an adhesive layer between the stacked layers, and 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. You can also do it.

Next, the method for forming the deposited film of layer A is to pulverize and mix a water mixture obtained by adding a binder and water to the color-forming compound using a ball mill, etc., and then coat it on a substrate etc. by a conventional method. Wear it and do it.

The binder used in unreleased RY1 includes natural polymers such as gelatin and starch, cellulose nitrate, cellulose conductors such as carboxymethyl cellulose, and semisynthetic materials such as natural rubber plastics such as chlorinated rubber and cyclized rubber. Polymers, polyisobutylene, polystyrene, terpene resin, polyacrylic acid, polyacrylic ester, polymethacrylic ester, polyacrylonitrile, polyacrylamide, polyvinyl acetate, polyvinyl alcohol, polyvinylpyrrolidone, polyacetal resin, poly Vinyl chloride, polyvinylpyridine, polyvinylcarbazole, polybutadiene, polystyrene-butadiene, butyl rubber, polyoxymethylene, polyethyleneimine,
Polyethyleneimine hydrochloride, poly(2-acryloxyethyldimethylsulfonium chloride)
Polymerizable synthetic polymers such as phenolic resins, amine resins, toluene resins, alkyd resins, unsaturated polyester resins, allyl resins, polycarbonates, polyamide resins, polyether resins, silicon resins, furan resins,
Examples include condensation polymerization type synthetic polymers such as thiocol rubber, and addition polymerization type resins such as polyurethane, polyurea, and epoxy resins.

An example of the structure of the optical recording element according to the present invention manufactured by the method described above is as shown in FIG. 1(a).
A layer 2 consisting of a color-forming compound and layer 8 consisting of an auxochrome compound
8 layers 4 and the light absorption layer 3 are provided on the B layer 4, the 8 layers 4 and the light absorption layer 3 are monomolecular films or their cumulative films, and the A layer 2 is a deposited film. It is a laminate, in which a light absorption layer 3 is supported on a substrate 1 and laminated in the order of substrate/light absorption layer/B layer/A layer. In this case, the A layer 2 and the 8 layer 4 may be reversed and laminated in the order of substrate/light absorption layer/A layer/Be.

Furthermore, to show another example, as shown in FIG. 1(b), A
Layers 2 and 8 layers 4 are laminated, a light absorption layer 3 is provided roughly on the A layer 2 to form a laminate, the 8 layers 4 are supported on a substrate l, and the substrate/B layer/A It is formed by laminating layers/light absorption layer in this order. In this case, similarly to the above, the A layer 2 and the 8-layer 4 may be reversed and laminated in the order of substrate/A layer/B layer/light absorption layer.

Furthermore, in any of the configurations shown in FIGS. 1(a) and 1(b), two or more of the laminates may be stacked and supported on the substrate.

The optical recording element according to the present invention is composed of a layer A made of a color-forming compound and a BM made of an auxochrome compound, which are brought into close contact with each other, but it is impossible to make such a structure with conventional technology. It had been. However, in the present invention, since the B layer is formed of a monomolecular film with a high degree of molecular order and orientation and a cumulative film thereof, one reactive site is separated from another through a non-reactive site within the molecule. This made it possible to adopt the above configuration.

Further, since the optical recording element according to the present invention is constructed by laminating the A layer and the B layer in close contact with each other and further providing a light absorption layer on the outside, the light absorption layer is heated by infrared irradiation.
Due to the heat conduction, the color-forming compound in the A layer and the auxochrome compound in the B layer come into contact with each other under heat, and a color-forming reaction progresses, forming a color-forming point at a predetermined position so that information can be recorded.

Therefore, the optical recording element according to the present invention can be mainly used as an optical disc. FIG. 5 shows an example of an information recording device having an optical pickup optical system for reading or reading information from the optical disc.

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 28 and an optical pickup optical system.

Writing is performed as follows. The control circuit 27 controls the oscillation of the semiconductor laser 2B. Therefore, the input information is converted into an optical signal by the control circuit 27 and the semiconductor laser 26. The optical signal 29 passes through the optical pickup optical system shown in FIG. 5, forms an image on the recording layer of the optical disk 18 which is rotating synchronously, and is recorded in color by the coloring mechanism described above.

Reading is performed in the following manner. A low-output continuous wave light emitted from the semiconductor laser 26 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 reflective layer of metal such as aluminum on the substrate of the optical recording element.

The thickness of the metal reflective layer is preferably 1.000 A to 2,000 A. In addition, a dielectric mirror may be used as necessary.

Furthermore, a protective layer may be provided on the surface of the outermost layer to protect the A layer, B layer, light absorption layer, etc. Materials for such a protective layer include dielectrics such as 5i02, plastic resins, and other materials. Polymerizable LBlliJ and the like are preferred.

[Example] Hereinafter, the present invention will be explained in more detail by showing examples. In addition, unless otherwise specified below, "department" is "ff".
"i amount part" and "%" represent "weight %".

Synthesis example 1 (synthesis example of light-absorbing substance) Vanadium phthalocyanine 1゛p゛・Urea 1
After mixing and dissolving 0 part and 1 part of a 10-15% phosphoric acid aqueous solution, further add 2 parts of phthalic anhydride, 10 parts of vanadyl j1 and a derivative of phthalcyanine anhydride represented by formula (1) % formula % Add 8 parts,
1() Heated at 0°C for 5 hours. After cooling.

100 parts of a 2% dilute NaOH aqueous solution was added, hydrolyzed, and separated by chromatography to obtain 0.1 part of the target substance (vanadium phthalocyanine derivative) represented by formula (II) [in formula (■), R represents]. Ta.

Example 1 (1) Method for forming a light-absorbing layer Glass (disc) on a disk of pus with a thickness of 10 ■ intestine and a diameter of 18 h a! A single molecule accumulator of a vanadium phthalocyanine derivative, which is a light-absorbing substance, was formed using the above-mentioned single molecule accumulator with an ISi plate sufficiently cleaned.

The monomolecular cumulative film of the vanadium phthalocyanine derivative was formed as follows.

After submerging the substrate in water so that it is perpendicular to the water surface, add vanadium phthalocyanine derivative to a concentration of 2×1.
A chloroform solution of 0°' mol/Jl is dropped onto the water surface to develop a single molecule nI2 on the water surface. The surface pressure is set to 30
dyne/cm, and the substrate was moved up and down at a speed of 2 cm/min to form a two-layer monomolecular cumulative film (Y-type II!2).
)It was created.

By the same method, samples were obtained in which monomolecular cumulative films of 14, 6, and 8 layers of tH were respectively created.

However, to create only one layer (monolayer), first spread a monolayer on one water surface using the method described above.

Next, it was obtained by attaching the substrate while submerging it in water. (X type) (2) Method for forming layer B Next, on the light absorption layer formed on the glass substrate of each sample obtained in (1) above, use the monomolecular accumulator described above to form an auxochrome layer. A monomolecular cumulative film of the compound araxic acid was formed.

The method for forming the monomolecular stacks 11 of araxic acid was performed as follows.

After submerging the substrate in water so that the substrate on which the light absorption layer was formed is perpendicular to the water surface, araxic acid was added at a concentration of 2X.
A chloroform solution of 10' mol/u is dropped onto the water surface and a monomolecular film is spread on the water surface at a surface pressure of 30 d7.
The monomolecular cumulative film (Y
A mold film) was prepared for each sample.

(3) Formation method of A layer Next, the B layer formed on the glass substrate of each sample in (2) above.
A deposited film of crystal violet lactone, a color-forming compound, was formed on the layer.

The formation method is to mix 7 parts of crystal violet lactone, 1 part of polyvinyl alcohol as a binder, and 100 parts of water, then grind and mix for several hours using a ball mill, spin coat on the B layer of the substrate, and disperse in the binder. Deposited film of crystal violet lactone (IV2.
Thickness IIL) was obtained.

(4) Performance test The optical recording element according to the present invention manufactured by the above-mentioned method and a conventional optical disk having a similar structure (all of which are constructed without using a monomolecular film or a cumulative film thereof) were used as a comparative example.
After recording under the following recording conditions using the information storage device shown in the figure, the characteristics of the two were compared by reading and reproducing.

<Recording conditions) Semiconductor laser wavelength: 830 nm Laser output: 6 to 9IIIw Recording frequency: flI5 MHz Optical disk rotation speed: 1.80 Orpm or higher, reading was performed with a laser output of 1 mW, and the signal/noise ratio was determined. Table 2 shows the results of reading. .

:jS2 Table Note: The palm shows a comparative example, and each layer was formed by a spin coating method.

From the results in Table 2, comparing No. 1 (when the B layer and light absorption layer are composed of monomolecular Bq) and No. 086, No.
It is recognized that No. 1 is significantly superior in signal/noise ratio. No. 1 and No. 8 have almost the same film thickness, but this difference in performance occurs because No. 1 has fewer defects such as pinholes and the molecular orientation is maintained in an orderly manner. This seems to be because there are.

Similarly, in the comparison between No. 002 to No. 5 (when the B layer and the light absorption layer are composed of monomolecular cumulative films) and No. 7, N
It is recognized that No. o, 2 to No. 5 are superior in signal/noise ratio.

[Effects of the Invention] As explained above, in the optical recording element according to the present invention, the B layer and the light absorption layer are composed of a monomolecular film or a cumulative film thereof, and the A layer is composed of a deposited film. , it has the following excellent effects.

(1) The signal/noise ratio is higher than that of optical recording elements that do not use conventional monomolecular films or their cumulative films.

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) It is possible to increase the area of the optical recording element.

(5) Since the light absorption layer is not interposed between the A layer and the B layer, coloring efficiency and fidelity are improved.

(6) Since the light absorption layer is not interposed between the A layer and the B layer, the actual recording/armor layer can be made thinner, and higher density recording is possible.

(7) Chemically changing (synthesizing) a material that has good coloring efficiency and is excellent as a coloring agent, etc., but is difficult to form a monomolecular film or its cumulative film, or a derivative that easily forms a monomolecular film or its cumulative film. There is an advantage that materials that are difficult to manufacture due to cost can be used for the composite FJ.

(8) Since a deposited film is used in a part of the laminate, sensitivity is improved, there is a wide range of material selection during manufacturing, and manufacturing is easy, and the difference between contrast and non-contrast during reading is improved. It has effects on optical properties such as easy adhesion.

[Brief explanation of drawings]

FIG. 1(a) and FIG. 1(b) are a schematic cross-sectional view showing an embodiment of an optical recording element according to the present invention, and FIG.
) to FIG. 2(C) are explanatory diagrams showing the recording process of a conventional optical recording element, FIG. 3 is a schematic cross-sectional view of a monomolecular cumulative film forming apparatus, and FIG. ) is a manufacturing process diagram of the monomolecular film 81, and FIG. 5 is a block diagram of the information storage device.

Claims (1)

[Claims] (1) Layer A consisting of a normally colorless or light-colored color-forming compound and layer B consisting of an auxochrome compound that develops color when in contact with the color-forming compound are laminated, and a light-absorbing layer is further provided, and (a) The B layer is a monomolecular film of an auxochrome compound or a cumulative film thereof; (b) The light-absorbing layer is a monomolecular film of a light-absorbing substance or a cumulative film thereof. An optical recording element characterized by: