JPS62140889A - Optical recording method - Google Patents

Abstract

PURPOSE:To provide an optical recording method by which information can be optically written by using semiconductor laser, by providing a recording layer which comprises a monomolecular film or built-up film of a diacethylene derivative compound (DA) having a hydrophilic part and a hydrophobic part and an azulenium salt compound (AZ) having a skeleton of a predetermined general formula. CONSTITUTION:An optical recording medium provided on a substrate 8 has a recording layer which comprises a DA compound 9 and an AZ compound 10 and in which the DA compound, either solely or in mixture 11 with the AZ compound, forms a monomolecular film or built-up film. The AZ compound has a skeleton of general formula (1), wherein each of R1-R7 is hydrogen, a halogen or a monovalent organic residue, and generates heat when being irradiated with IR rays of a wavelength of not less than 750nm. When the entire body of the recording layer is irradiated with UV rays, the DA compound 9 is polymerized to be a polydiacetylene derivative compound (PDA), with a color change to blue or a dark color. Next, when predetermined parts of the recording layer are irradiated with laser beams of a wavelength of 800-850nm blinking in response to an information signal, the PDA compound dose not absorb the beams, while the AZ compound absorbs the beams to generate heat, which is transferred to the adjacent PDA compound to turn the latter red. Accordingly, an optical record can be obtained through a color change at recording parts according to the input information.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical recording method for an optical recording medium containing a monomolecular film of a diacetylene derivative compound or a cumulative film thereof,
In particular, the present invention relates to an optical recording method using an infrared laser of 800 to 850 nm as an optical writing means.

[Conventional technology]

Recently, Akira disks have been attracting attention as a central part of office automation. Optical discs can store a large amount of documents, literature, etc. on a single disc, allowing for efficient organization and management of documents, etc. in an office. Various types of recording media have been considered for this optical disk, but those using organic materials are attracting attention because of their cost and ease of manufacture.

Diacetylene derivative compounds are known as organic materials for such recording media. Focusing on the thermochromic properties of these compounds, a recording technology for use as laser recording media was disclosed in Japanese Patent Application Laid-Open No. 147807/1983. There is. However, this specification does not mention what kind of laser was used or should be used, and merely states that recording was performed using a laser.

The present inventors investigated laser recording of this diacetylene derivative compound using various lasers, and found that although thermochromic recording is possible using a large, high-output laser such as an argon laser, It was confirmed that laser recording could not be performed when a relatively low output semiconductor laser (wavelength 800 to 850 nm) was used.

However, for practical recording media such as optical discs, it is required that optical writing be possible using a small, low-output semiconductor laser.

Furthermore, since the conventional recording layer made of a diacetylene derivative compound as described above is formed using microcrystalline powder of the diacetylene derivative compound, the molecular orientation of the diacetylene derivative compound molecules within the recording layer is is random,
Therefore, depending on the location, there are problems such as differences in light transmittance and reflectivity, and differences in the degree of chemical reaction, and it is not necessarily suitable for high-quality, high-density recording.

[Problems to be Solved by the Invention] The present invention has been made to solve the problems of the prior art. 1. The purpose of the present invention is to provide an optical recording method that allows optical writing using a small and lightweight semiconductor laser. It is about providing.

Another object of the present invention is to provide an optical recording method capable of high-speed recording with high density, high sensitivity, and high resolution.

Still another object of the present invention is to provide an optical recording method that has excellent stability and can obtain high-quality optically recorded images.

[Means for solving problems]

That is, the present invention provides a record containing a monomolecular film or a cumulative film of a diacetylene derivative compound having at least a lignophilic site and a hydrophobic site, and an azulenium salt compound having a skeleton represented by the following general formula CI). The optical recording medium having the layer is irradiated with ultraviolet rays, and then 800 to 850 nm
This optical recording method is characterized by having a step of irradiating an infrared ray of m in accordance with recorded information to discolor an irradiated portion of a recording layer.

(In the formula, R1-R7 are hydrogen atoms, halogen atoms,
[Action] A diacetylene derivative compound having both a hydrophilic site and a hydrophobic site (hereinafter abbreviated as DA compound) contained in an optical recording medium used in an uninvented method. ) is a compound capable of 1.4-addition polymerization reaction between C=C-C=C functional groups in adjacent molecules, and is typically represented by the following general formula % formula % (wherein, X is , is a lignophilic group forming a hydrophilic site,
(m and n represent integers) Examples include compounds represented by the following formula.

Examples of the hydrophilic group X in the above DA compound include a carboxyl group, an amine group, a hydroxy group, a nitrile group,
Examples include a thioalcohol group, an imino group, a sulfonic acid group, a sulfinyl group, or a metal or amine salt thereof.

The alkyl group represented by H (CH2)m- forming the hydrophobic site is preferably a long-chain alkyl group having 10 to 30 carbon atoms. On the other hand, the azulenium salt compound (hereinafter abbreviated as AZ compound) having a skeleton represented by the general formula (I) used in the present invention has an absorption peak in a wavelength range of 750 nm or more, and has an absorption peak in the wavelength range of 750 nm or more. It is a compound that generates heat when exposed to external light.

AZ compounds containing the general formula (I) can be classified into the following three types.

(II) (III) (IV) In the compounds shown in (II) to (IT), R1-R
7 represents a hydrogen atom, a halogen atom, or a monovalent organic residue.

Monovalent organic residues include alkyl groups, alkoxy groups,
Examples include a substituted or unsubstituted aryl group, an acyl group-substituted or unsubstituted amine group, a nitro group, a hydroxy group, a carboxyl group, a cyano group, or a substituted or unsubstituted arylazo group.

A represents a divalent organic residue bound by a double bond,
This is shown in the following specific example.

Ze represents an anionic residue such as verchlorate, fluoroporate, p-toluenesulfonate, periodide, chloride, bromide or iodide.

Specific examples of the AZ compound used in the present invention are shown below.

(, ;ti3 CH3/ The optical recording medium used in the method of the present invention contains the DA compound and the AZ compound, and the DA compound alone or in a mixed state with the AZ compound forms a monomolecular film or an accumulation thereof. It has a recording layer forming a film,
Specific configurations of the optical recording medium include the following aspects.

(1) One having a recording layer consisting of a mixed monomolecular film of DA compound 9 and AZ compound 1O or a cumulative film thereof (second
A schematic cross-sectional view is shown in the figure).

(2) A recording layer consisting of two layers: a monomolecular film of DA compound 9 or a cumulative film thereof, and a layer containing AZ compound 10 (two-layer separation system, a schematic cross section of which is shown in Figure 3). Figure shown).

(3) A record in which one or more layers of layer A consisting of a monomolecular film of DA compound 9 or a cumulative film thereof and one or more layers of layer B consisting of a monomolecular film containing an AZ compound or a cumulative film thereof are laminated. One having layers (Peter's cumulative film system, a schematic cross-sectional view is shown in Fig. 4).

In addition, in two-layer separation systems and hetero-cumulative membrane systems, D
A layer consisting of a monomolecular film of compound A or a cumulative film thereof, and
The radiation absorbing layer containing the Z compound or the eight layers may be stacked in any order on the surface side of the recording layer. A protective layer may also be provided.

As the substrate 8 of the optical recording medium used in the present invention, glass,
Plastic plates such as acrylic resin, plastic films such as polyester.

Although various supporting materials such as paper, metal etc. can be used.

When recording by irradiating radiation from the board side,
Use one that transmits recording radiation of a specific wavelength.

To form a monomolecular film or a monomolecular cumulative film of a DA compound on a substrate or a layer containing an AZ compound, for example, the Langmuir-Prodgett method (hereinafter abbreviated as LB method) developed by Langmuir et al. ) is used.

The LB method is a molecule with a structure that has a parent wood group and a hydrophobic group in one molecule, and when the balance between the two (balance of amphiphilicity) is maintained appropriately, this molecule lowers the parent wood group on the water surface. This is a method of creating a monomolecular film or a film made up of monomolecular layers by taking advantage of the fact that the monomolecular layer becomes a layer directed toward the molecule. The monomolecular layer on the water surface has the characteristics of a two-dimensional system. When zero molecules are sparsely dispersed, the two-dimensional ideal gas equation, II A = between the plane per molecule, IA, and the surface pressure II, K T holds true, resulting in a "gas film", where is Portzmann's constant and T is the absolute temperature. If A is made sufficiently small, the intermolecular interaction becomes strong and a two-dimensional solid "condensed film (or solid film)" is formed. The condensed film can be transferred layer by layer to the surface of a substrate such as glass.

Using this method, a monomolecular film or a monomolecular cumulative film of a DA compound is produced, for example, as follows. First, DA
A compound is dissolved in a solvent such as chloroform and spread on an aqueous phase to form a developed layer in which these compounds are developed into a film.Next, this developed layer freely diffuses on the aqueous phase. To prevent it from spreading too much, a partition plate (or float) is provided to limit the area of the developed layer and control the aggregation state of these compounds.
Obtain a surface pressure (■) proportional to the aggregate state. By moving this partition plate, the developed area can be reduced to control the aggregation state of the film material, and the surface pressure can be gradually increased to set the surface pressure II suitable for producing a cumulative film. By gently raising and lowering a clean substrate vertically while maintaining this surface pressure,
A monolayer of a DA compound is transferred onto a substrate or onto a layer containing an AZ compound salt on its surface. A monomolecular layer film is produced in this manner, and a monomolecular layer cumulative film having a desired degree of accumulation is formed by repeating the above-described operations.

In order to transfer the monomolecular film onto the substrate, other than the above-mentioned vertical dipping method, methods such as horizontal adhesion method, single rotation cylinder method, etc. can be employed. The horizontal deposition method is a method in which the substrate is brought into horizontal contact with the water surface and transferred, and the one-turn cylinder method is a method in which a cylindrical concrete is rotated on the water surface to transfer a monomolecular layer onto the substrate surface. In the vertical immersion method described above, when a substrate with a hydrophilic surface is lifted out of water in a direction transverse to the water surface, a monomolecular layer with the parent group of the DA compound facing the substrate is formed on the substrate at the -1t point. Ru. When you move the board up and down, 1. The mixed monomolecular film is laminated one layer at a time in each process, and the direction of the film-forming molecules is reversed between the pulling process and the dipping process. A Y-shaped film is formed in which the groups and the hydrophobic groups face each other.

On the other hand, the horizontal deposition method is a method in which the substrate is brought into horizontal contact with the water surface and transferred, and a monomolecular layer of the DA compound with the hydrophobic group facing the substrate is formed on the substrate. In this method, there is no change in the orientation of the DA compound molecules even if they are accumulated, and an X-type film is formed in which the hydrophobic groups face the substrate in all layers.On the contrary, in all layers the parent groups are The cumulative film facing the substrate side is called a Z-type film.

The rotating cylinder method is a method in which a cylindrical substrate is placed on the water surface and F is rotated to transfer a monomolecular layer onto the substrate surface. Methods for transferring a monomolecular layer onto a substrate are not limited to these methods.
When using a large-area substrate, a method such as extruding the substrate from a substrate roll into an aqueous phase may also be used. Furthermore, the orientation of the aforementioned parent wood group and hydrophobic group toward the substrate is a general rule, and can be changed by surface treatment of the substrate, etc.

Details of these monomolecular film transfer operations are already known, and are described, for example, in "New Experimental Chemistry Course 18 Interfaces and Colloids", pp. 498-507, published by Maruzen.

Also, a so-called mixed monolayer or mixed monolayer alli consisting of two or more compounds can be obtained by the same method as described above. At this time, it is sufficient that at least one of the two or more compounds constituting the mixed monomolecular film or the mixed monomolecular cumulative film has both a hydrophilic site and a hydrophobic site; A monomolecular layer is formed on the water surface, and as long as the amphipathic balance is maintained in at least one compound, a monomolecular layer is formed on the water surface, and other compounds are not required to have a hydrophobic group. The compound is sandwiched between amphiphilic compounds, and eventually a monolayer with molecular order is formed as a whole.

Therefore, a recording layer consisting of a mixed monomolecular film or a mixed monomolecular cumulative film of a DA compound and an AZ compound can be prepared by dissolving the DA compound and the AZ compound in a solvent such as chloroform, spreading this on an aqueous phase, and dissolving the DA compound and the AZ compound in a solvent such as chloroform. Developing a compound into a film 1
After forming the yIA layer, it can be formed by the LB method in the same manner as before.

However, in order to dramatically improve film-forming properties, it is necessary to make the AZ compound amphiphilic.

On the other hand, to form a layer containing an AZ compound, a typical method can be adopted in which the AZ compound is dissolved in a suitable volatile solvent to prepare a coating liquid, and then the coating liquid is applied. Various binders made of natural or synthetic polymers may be added to the coating solution as appropriate in order to improve the adhesion to the substrate and the layer consisting of a monomolecular film of a DA compound or a cumulative film thereof.
Furthermore, various additives may be added to improve the stability and quality of this layer.

Suitable solvents for the AZ compound include alcohols such as methanol, ethanol, and impropatol; acetone;
Ketones such as methyl ethyl ketone and cyclohexanone;
Aliphatic nitriles such as acetonitrile; chloroform,
Examples include aliphatic halogenated hydrocarbons such as methylene chloride, dichloroethylene, carbon tetrachloride, and trichlorethylene, with methylene chloride and acetonitrile being particularly preferred.

The coating liquid thus obtained can be applied by spinner rotation coating method, dip coating method, spray coating method, and beep coating method.

Techniques such as a wire bar coating method, a blade coach ink method, a roller coating method, and a curtain coating method are used.

Further, the layer containing the AZ compound may be a monomolecular film or a cumulative film thereof, similar to a layer consisting of a monomolecular film of a DA compound or a cumulative film thereof.However, the AZ compound may be a monomolecular film or a cumulative film thereof. Therefore, it is not possible to form a monomolecular film by the LB method alone.However, for example, organic polymers with a moderate balance of amphiphilic properties such as higher fatty acids such as stearic acid and aragidic acid can be used. By applying the LB method using a mixture of carrier molecules in an arbitrary ratio, a mixed monomolecular film or a mixed monomolecular cumulative film containing the AZ compound can be formed.

When the recording layer is composed of a mixed monomolecular film of a DA compound and an AZ compound or a cumulative film thereof, it is practically preferable that the film thickness is up to about 400 μm.

In the case of a two-layer separation system, the thickness of the monomolecular film of the DA compound or its cumulative film is preferably one with a cumulative J, a degree of up to about 400, and the thickness of the AZ compound-containing layer is: When it is formed as a monomolecular film or a cumulative film thereof, the thickness is up to about 200, and when it is formed as a non-width molecular film, it is about 100 to 5,000 Igm, especially 200 to 5,000. A range of people is preferred.

In the case of Peter's cumulative film system, there are two or more bonding surfaces between the A layer and the B layer, and the cumulative degree of the monomolecular film including the A layer and the B layer is 2.
A value of up to about 0.00 is practically preferred.

In this way, the monomolecular film and its cumulative film formed on the substrate have high density and a high degree of order.
The variation in light absorption depending on the location is extremely small. Therefore, by configuring the recording layer with such a film, optical recording,
A recording medium used in the present invention having a high-density, high-resolution recording function capable of thermal recording can be obtained.

In the recording method of the present invention, the recording medium configured as described above to be subjected to recording is first polymerized with the DA compound in the recording layer. Namely.

The DA compound is initially almost colorless and transparent, but when the entire recording layer is irradiated with ultraviolet rays, it polymerizes and changes into a polydiacetylene derivative compound.

This polymerization occurs by irradiation with ultraviolet rays, etc., and does not occur simply by adding thermal energy.As a result of this polymerization, the recording layer becomes 6
It has a maximum absorption wavelength of 20 to 660 nm,
The color changes from blue to dark. The change in hue due to this polymerization is an irreversible change, and once the recording layer changes from blue to dark, it does not return to a colorless transparent film.In this way, the DA compound in the recording layer polymerizes and forms a polydiacetylene derivative compound. A recording medium having a recording layer that changes color from blue to dark is used in the method of the present invention.

When this polydiacetylene derivative compound that has changed from blue to dark color is heated to about 50°C or higher, it changes to about 540 nm.
It has a maximum absorption wavelength at , and the color changes to red. This change is also an irreversible change.The optical recording method of the present invention performs recording by utilizing the discoloration property of the polydiacetylene derivative compound, and the recording method of the present invention will be described in detail below.

FIG. 1 is a schematic diagram showing an example of an optical recording device used to carry out the optical recording method of the present invention. This optical recording device is comprised of an optical recording medium storage means (not shown) for setting the optical recording medium 1 at a predetermined position and an information writing means for writing information onto the optical recording medium. The information writing means includes a semiconductor laser 2 that emits infrared rays with a wavelength within the range of 800 to 850 nm, a control circuit 3 that controls oscillation of the semiconductor laser 2 according to input information, and an optical system (a collimating lens 4, a reflector 5, Wave plate 6 and objective lens 7
). Specifically, as the semiconductor laser 2, it is particularly suitable to use a GaAs junction laser with an output wavelength of 800 to 850 nm.

Input information is converted into an optical signal by a semiconductor laser via a control circuit. This optical signal passes through an optical system, is placed on an optical recording medium mounting means, and is imaged at a predetermined position of an optical recording medium having a blue recording layer that rotates synchronously. The polydiacetylene derivative compound present at the imaging point (site) does not absorb the laser beam of this wavelength, but the AZ compound absorbs this laser beam and generates heat. The heat generated by the AZ compound is transmitted to the adjacent polydiacetylene derivative compound, and the polydiacetylene derivative compound changes color to red.

In this way, optical recording is performed by changing the color of the recording area on the recording layer in accordance with the input information.

In the above example, the optical recording medium is a disc-shaped disk (
Although an optical disc) was used, optical tapes, optical cards, etc. can also be used depending on the type of substrate that supports the recording layer containing the polydiacetylene derivative compound and the AZ compound.

〔Effect of the invention〕

The effects of the optical recording method of the present invention are listed below.

(1) Since the recording layer is formed of a mixed or single monomolecular film of a DA compound or a stacked VL film thereof, it has a high density and a high degree of order, and there are few pinholes, etc., so there is no signal/noise. The ratio is high, allowing for high-density, homogeneous, and highly reliable recording.

(2) Since the recording layer contains an AZ compound that generates heat by absorbing infrared rays in the wavelength range of 800 to 850 nm, optical recording can be performed using a small and lightweight semiconductor laser that emits infrared rays in this wavelength range. can be implemented.

(3) Since it is possible to record using changes in the hue of the recording layer by light irradiation, high-speed, high-sensitivity, and high-density optical recording can be performed.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on examples.

Example 1 General formula Cl2H25-C=C-C=C-C8H16-C
A solution prepared by dissolving 1 part by weight of a diacetylene derivative compound represented by OOH and 1 part by weight of the AZ compound represented by Compound No. 1 in chloroform at a concentration of 1X10-3 mol/cross was prepared at a pH of 6.5. Cadmium chloride concentration force (= I
Myne/cm, and while keeping it constant, gently move the glass substrate, whose surface has been sufficiently clean and hydrophilic, down a hill at a vertical speed of 1.0 cm/min in the direction across the water surface. , a mixed monomolecular film of a DA compound and an AZ compound was transferred onto a substrate, and a mixed monomolecular film and 21 layers were formed.
Optical recording media were prepared in which mixed monomolecular cumulative Hi films of 41 layers and 81 layers were formed on a substrate.

These optical recording media were uniformly and sufficiently irradiated with 254 nm ultraviolet rays to polymerize the DA compound in the recording layer and turn the recording layer into a blue film, and then recording was carried out under the following recording conditions according to the input information.

Semiconductor laser wavelength: 830nm Laser beam diameter: LJLm Laser output 3mW, laser beam irradiation time per 1 bit: 200
When the surface of the ns blue optical recording medium was irradiated with a laser beam, the irradiated area changed color to red, indicating that recording was performed. This record was evaluated as follows. The recording density was determined by measuring the optical density of the recording (red) area. The resolution and sensitivity were determined by observing the correspondence between the recorded image and the laser beam diameter using a microscope, and a very good result was marked as 0, a good result was marked as O, and a case in which recording was not possible or the correspondence was poor was marked as ×. The evaluation of the recording results is shown in Table 1.

Comparative Example 1 The four types of optical recording media prepared in Example 1 were uniformly and sufficiently irradiated with 254 nm ultraviolet rays to make the recording layer a blue film, and then recording was performed under the following recording conditions according to the input information. .

Laser wavelength: 870nm Laser beam diameter: lm Laser output crab 3mW.

Laser beam irradiation time per 1 bit: 200n
The evaluation of the s record was carried out using the same criteria as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 2 The four types of optical recording media prepared in Example 1 were uniformly and sufficiently irradiated with 254 nm ultraviolet rays to make the recording layer a blue film, and then recording was performed under the following recording conditions according to the input information. .

Laser wavelength near 90nm Laser beam diameter: 1gm Laser output crab 3mW.

Laser beam irradiation time per 1 bit: 200
Evaluation of the ns recording was carried out using the same criteria as in Example 1, and the evaluation results are shown in Table 1.

Comparative Example 3 An optical recording medium was produced in the same manner as in Example 1 except that the AZ compound was not used. Recording was performed on this optical recording medium under the recording conditions of Example 1. The evaluation results are shown in Table 1.

Table 1 Example 2 In place of the diacetylene derivative compound represented by the general formula CI2 H25-C=C-C=C-C9H16°-COOH, the general formula C3H17-C=C-C=C-C2H4-C
A cumulative number of 4 was obtained in the same manner as in Example 1, except that a diacetylene derivative compound represented by 0OH was used.
1 recording medium was created. Recording was performed on this recording medium under the same recording conditions as in Example 1. The evaluation results are shown in Table 2.

Examples 3 to 7 Same as Example 2 except that the diene compound salts represented by Compound No. 3.8, 12.15, and 17 were used instead of the diene compound salts represented by Compound No. 1, respectively. An optical recording medium was created. Recording was performed on each of these optical recording media under the same recording conditions as in Example 1. The evaluation results are shown in Table 2.

@Table 2 Example 8 A coating solution obtained by dissolving 1 layer weight part of the AZ compound represented by Compound No. 1 in 20 weight parts of methylene chloride was applied to a glass disk substrate attached to a spinner coater. (Thickness: 1.5 mm, diameter: 200 mm) After dropping a small amount onto the center of the substrate, apply by rotating a spinner at a predetermined number of rotations for a predetermined time, dry at room temperature, and remove the dried coating film on the substrate. A large number of samples with a thickness of 200 and 3000 were prepared.

Next, the general formula Cl2H25-CEC-C=C-CBH1
DA compound represented by 5-COOH was added to chloroform at 3XIO-3 mol/! : A solution dissolved at a concentration of p
H is 6.5 and cadmium chloride concentration is I x 10-3
Developed on a mol/hc water phase.

After the solvent chloroform was removed by evaporation, the surface pressure was reduced to 20 d.
yne/cm and keeping it constant, the glass substrate on which the AZ compound layer was previously formed was gently lowered in the direction across the water surface at a vertical speed of 1.0 cm/min to form a monomolecular film of the DA compound. An optical recording medium was prepared in which a monomolecular film and a monomolecular cumulative film of 7 layers, 41 layers, 101 layers, and 201 layers were formed on a substrate by transferring the mixture onto a diene compound salt layer.

These optical recording media were uniformly and sufficiently irradiated with 254 layers of ultraviolet light to polymerize the DA compound in the recording layer and turn the recording layer into a blue film, and then recording was performed under the same recording conditions as in Example 1. . The evaluation of the records was carried out in the same manner as in Example 1, and the evaluation results are shown in Table 3.

Table 3 Example 9 General formula C12H25-C=C-C=C-C3H16-C
The DA compound represented by OOH was dissolved in chloroform by lXl.
A solution with a concentration of 0-3 mol/liter is dissolved at a pH of 6.5.
The mixture was developed on an aqueous phase with a cadmium chloride concentration of 1X10-3 mol/liter. After removing the solvent chloroform, the surface pressure was increased to 20 dyne/cm and kept constant.
A glass substrate that has been sufficiently cleaned and has a wood-friendly surface (
(including cases where a cumulative film etc. consisting of a monomolecular film containing AZ compounds has already been formed).

Gently lower the water a specified number of times in the direction across the water surface at a vertical speed of 1.0 cm/min (drying process is performed in the middle), DA
The compound and monomolecular film were transferred onto a substrate to form a monomolecular film or a monomolecular cumulative film.

1 part by weight of the AZ compound represented by Compound No. 1 and 7
A solution of 2 parts by weight of rachidic acid dissolved in chloroform at a concentration of 1X10 = 3 mol/cross was developed with an aqueous phase with a pF of 6.5 and a cadmium chloride concentration of IXIO-3 mol/cross. After removing 1 surface pressure 20
dyne/cm and keeping it constant, thoroughly clean a glass substrate with a hydrophilic surface (including cases where a cumulative film composed of a monomolecular film of a DA compound has already been formed). , vertical velocity 1.0 in the direction across the water surface
Gently move it up and down a predetermined number of times at cm/min (a drying process is performed in between).

A monomolecular film containing an AZ compound was transferred onto a substrate to form a monomolecular film or a monomolecular cumulative film.

Based on the fabrication process of a DA compound monolayer and a monolayer containing an AZ compound described above, eight types of hetero-cumulative films were fabricated on a glass substrate by appropriately combining these operations. . Table 4 shows the hetero-cumulative film (optical recording medium) thus produced. In addition,
The meanings of symbols and numbers indicating the structure of the optical recording medium are illustrated below.

(j', + G / 20 A Z / 60 D A
/ 20 AZ glass substrate (G): Cumulative degree 2
Optical recording constructed by laminating in the following order: a monomolecular cumulative film containing an AZ compound with a cumulative degree of 0; a monomolecular cumulative film of a DA compound with a cumulative degree of 60; a monomolecular cumulative film containing an AZ compound salt with a cumulative degree of 20; Medium.

U) G / l OX (2A Z / 6 D A
) A laminated combination of a monomolecular cumulative film containing an AZ compound with a cumulative degree of 2 and a monomolecular cumulative film of a DA compound with a cumulative degree of 6 is repeated 10 times on a glass substrate (G)h. optical recording media.

After uniformly and sufficiently irradiating these optical recording media with 254 nm ultraviolet rays to polymerize the DA compound in the recording layer and turning the recording layer into a blue film, recording was performed under the same recording conditions as in Example 1 according to the input information. was carried out. The evaluation of the records was carried out in the same manner as in Example 1, and the results are shown in Table 4.

Table 4

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of an information recording device using the method of the present invention, and FIGS.
1 is a schematic cross-sectional view of a typical embodiment of an optical recording medium used in the present invention. 1: Optical disk, 2 semiconductor lasers, 3: Control circuit, 4: Collimator lens, 5: Reflector,
6: 1/4 wavelength plate. 7: Objective lens, 8: Substrate. 9 Niadiace'tyrene derivative compound 10 Niazurenium salt compound, ll Niazurenium salt compound-containing layer 12/A layer, 13:3 layer. 14: Organic carrier molecule. More 20 Male 30

Claims (1)

[Claims] A record containing a monomolecular film of a diacetylene derivative compound having at least a hydrophilic site and a hydrophobic site or a cumulative film thereof, and an azulenium salt compound having a skeleton represented by the following general formula (I) Optical recording comprising the steps of irradiating an optical recording medium having a layer with ultraviolet rays and then irradiating infrared rays of 800 to 850 nm in accordance with recorded information to discolor the irradiated area of the recording layer. Method. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(I) (In the formula, R_1 to R_7 represent hydrogen atoms, halogen atoms, or monovalent organic residues.)