JPS62141536A - Optical recording method - Google Patents

Abstract

PURPOSE:To enable optical writing with small-sized lightweight semiconductor laser by combinedly using an AZ compound and a diacetylene deriv. compound in a recording layer. CONSTITUTION:A used optical recording medium has a recording layer contg. a diacetylene deriv. compound and an azulenium salt compound having a skeleton represented by formula I (where each of R1-R7 is H, halogen or a univalent org. residue). Infrared rays having 800-850nm wavelength are projected on an optical recording medium in accordance with information to be recorded to form a latent image and ultraviolet rays are projected on the recording medium having the formed latent image to convert the image into a visible image. The azulenium salt compound has an absorption peak in the wavelength range of >=750nm and generates heat under infrared light having >=750nm wavelength.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical recording method on an optical recording medium containing a diacetylene derivative compound, and in particular a method using an infrared laser □ of 800 to 850 nm as an optical aging means. Concerning optical recording methods.

[Background Art] Recently, optical discs have been attracting attention as a central player in office automation. Optical discs can store a large amount of documents, etc. on a single disc, so
Organize and manage documents, etc. in the office efficiently. Various types of recording media have been considered for this optical disc, 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-power laser such as an argon laser, It has been confirmed that laser recording cannot be performed when a low output semiconductor laser (wavelength 800-850 nm) is used.

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

[Problems to be Solved by the Invention] The present invention has been made to solve the problems of the prior art, and the purpose of the present invention is to enable optical writing using a small and lightweight semiconductor laser, and to An object of the present invention is to provide an optical recording method capable of recording information as a latent image on a recording medium, and then optionally converting the recorded information into one image and reading it as needed.

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

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

[Means for Solving the Problems] That is, the present invention provides an optical recording medium having a recording layer containing a diacetylene derivative compound and an azulenium salt compound having a skeleton represented by the following general formula (I). 8
The method includes a step of irradiating infrared rays of 00 to 850 nm according to recorded information to form a latent image, and a step of irradiating a recording medium on which the latent image is formed with ultraviolet rays to make the latent image visible. Optical recording method for visualization.

(In the formula, R1-R7 are hydrogen atoms, halogen atoms, or 1
) [Function] The diacetylene derivative compound contained in the optical recording medium used in the method of the present invention is a diacetylene derivative compound represented by the following general formula (hereinafter abbreviated as DA compound). ) R-C=C-C=C-R' (wherein R and K are 1, for example, an alkyl group, an olefinic hydrocarbon group such as vinyl, vinylidene, and ethynyl, and a condensed polycyclic group such as phenyl, naphthyl, and anthranyl) Phenyl group, chain polycyclic phenyl group such as biphenyl, terphenyl, other nonpolar groups, carboxyl group and its metal salt or amine salt, sulfonic acid group and its metal salt or amine, 11. Sulfoamitol, amido group, amino group, imino group, hydroxy group, quaternary amino group, oxyamino group, diazonium group, guanidine group, hydrazine group, phosphoric acid group.

Examples include silicic acid groups, aluminic acid groups, nitrile groups, thioalcohol groups, and other polar groups.

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.

It is a compound that generates heat when exposed to infrared light.

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

(It) (m) (mV) In the compounds shown in (II) to (IV), R1 to Rf represent a hydrogen atom, a halogen atom, or a monovalent organic residue.

Monovalent organic residues include alkyl groups, alkoxy groups,
Mention may be made of substituted or unsubstituted aryl groups, acyl groups, substituted or unsubstituted amino groups, nitro groups, hydroxy groups, carboxyl groups, cyano groups or substituted or unsubstituted arylazo groups.

A represents a divalent organic residue bonded via a 2ffi bond, and is shown in the following specific example.

Ze is par. ,-to, yao. Bo-4, p-) represents a heptadionic residue such as luenesulfonate, perfiodide, chloride, bromide or iodide.

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

(H3 CH3' The optical recording medium used in the present invention contains the DA compound and the AZ
The structure may be any of a mixed-layer system, a two-layer separation system, or a multi-layer laminate system.

Here, a single-layer mixed system is one consisting of a mixed layer of a DA compound and an AZ compound, and a two-layer separated system is one in which a layer containing a DA compound and a layer containing an A2 compound are separated and laminated. Furthermore, a multi-Sa layer system refers to the above-mentioned two-layer separated system in which one or more layers containing a DA compound and one or more layers containing an AZ compound are laminated on a substrate in a predetermined number and order. Each refers to a structure that does not include.

Typical configurations of the optical recording medium used in the present invention are shown in FIGS. is a two-layer separation system, that is, the first layer 7 containing the A compound and the AZ
A recording layer 2 consisting of a layer 8 containing a compound is provided on a substrate 1.

To form the recording layer 2 1. Typically, in the case of a single-layer mixed system, a coating liquid is prepared by mixing a fine crystal powder of a DA compound and an AZ compound in a suitable volatile solvent, and this coating is In the case of a two-layer separation system or a multilayer laminated system, separately prepare a coating solution containing a fine crystal powder of a DA compound and a coating solution containing an AZ compound. may be applied to the substrate l in a predetermined order.

As the substrate l 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.

The solvent of the coating liquid used to form the single-layer mixed recording layer is appropriately selected depending on the type of Ba and Ingu used and the type of DA compound and pyrylium dye, but in general,
Alcohols such as methanol, ethanol, and impropatol; Ketones such as acetone, methyl ethyl ketone, and cyclohexanone; N, N-dimethylformamide, N
, Ketones such as N-dimethylacetamide; Sulfoxides such as dimethyl sulfoxide; Tetrahydrofuran,
Ethers such as dioxane and ethylene glycol monomethyl ether; esters such as methyl acetate, ethyl acetate, and butyl acetate; aliphatic halogenated hydrocarbons such as chloroform, methylene chloride, dichloroethylene, carbon tetrachloride, and trichloroethylene; benzene , aromatic hydrocarbons such as toluene, xylene, monochlorobenzene, and dichlorobenzene.

Further, as a solvent for a coating solution used to form a two-layer separation system or a multilayer laminated system, methanol and ethanol are suitable solvents for the AZ compound.

Alcohols such as Impropatol; Ketones such as acetone, methyl ethyl ketone, and cyclohexanone; Aliphatic nitriles such as acetonitrile; Aliphatic halogenated hydrocarbons such as chloroform, methylene chloride, dichloroethylene, carbon tetrachloride, and trichlorethylene ; etc., with methylene chloride and acetonitrile being particularly suitable. Furthermore, suitable dispersion media for the DA compound include aliphatic hydrocarbons such as n-hexane, n-hebutane, n-octane, and cyclohexane.

In addition, in order to improve the adhesion with the substrate 1 or with other layers, a binder made of natural or synthetic polymer may be added to each coating liquid as appropriate.
2. Stability 1. Various additives may be added to improve quality.

Coating of such a coating liquid onto the substrate l can be carried out by a spinner rotation coating method, a dip coating method, a spray coating method,
Peed coating method, wire bar coating method,
Techniques such as a blade coating method, a roller coating method, and a curtain coating method are used.

When the recording layer 2 is of a mixed layer type, the film thickness is suitably about 300 to 2 m, particularly preferably from 400 to 5000 m, and in the case of a two-layer separated system, the thickness of each layer is The suitable thickness is about 100 to 1 gm, especially 200 to 5 gm.
Further, in the case of a multilayer laminated system, the sum of the thicknesses of the layers containing individual DA compounds and the sum of the thicknesses of the layers containing individual biryllium dyes are preferably in the range of 1.
00 to lILm is suitable, especially 200 to 50 people.
A range of 00 people is preferred.

The blending ratio of the DA compound and the AZ compound in the recording layer 2 is preferably about 1/15 to 15/l, and optimally about 1/1.
It is 0 to 5/l.

Note that various types of M retention layers may be provided on the QH2 configured in this way, if necessary.

Further, in the case of a two-layer separation system or a multi-layer laminated system, the order of the ends of each layer is not a particular problem.

The optical recording method of the present invention can be carried out using a recording medium configured in this manner.

In this recording medium, by irradiating the DA compound with light, the absorption wavelength of the Q layer changes and the apparent color changes. That is, the DA compound is initially almost colorless and transparent, but upon irradiation with ultraviolet rays, it polymerizes and changes into a polyacetylene derivative compound. This polymerization occurs only by irradiation with ultraviolet light and not by the application of other physical energy such as heat.
The maximum absorption wavelength is focused on nm, and the color changes to blue or dark. This change in hue due to polymerization is an irreversible change, and once the Q layer changes to blue, it does not return to a colorless transparent film.

Furthermore, when this blue-colored polydiacetylene derivative compound is heated to about 50° C. or higher, it now has a maximum absorption wavelength of about 540 nm and changes to a red film.

This change is also an irreversible change.

On the other hand, the inventors of the present invention have conducted various studies on the recording layer having the above-mentioned structure, and have found that it is possible to heat the recording layer at an appropriate temperature that does not destroy it or deform its shape, and once it undergoes a process of bringing it into a molten state. It was discovered that even if the recording layer was irradiated with ultraviolet rays as described in J:, the recording layer did not change to blue.

That is, this is because the change to a blue film as a result of polymerization of the DA compound due to ultraviolet irradiation is mainly due to the highly ordered molecular orientation of the DA compound molecules in the DA compound crystals contained in the recording layer 2. 1. As in Section E, the recording layer is heated to melt the layer containing the DA compound, and the DA compound crystal contained in that portion is melted to form an amorphous state.

This is thought to be because when the orientation order of the DA compound molecules in that part is disturbed, the number of DA compound molecules in a positional relationship that allows reaction at the single molecule arrangement level is significantly reduced.

The optical recording method of the present invention performs recording by utilizing the characteristics of the A compound crystal and the function obtained by the combination of this and the AZ compound.

Hereinafter, an example of the optical recording method of the present invention will be described.

First, the recorded information is transmitted through an appropriate control circuit using a semiconductor laser using light 4I! It is converted to number i. This optical signal is placed on, for example, an optical recording medium mounting means through an optical system, and is placed at a predetermined position on a disk-shaped recording medium having a synchronously rotating recording layer (see FIG. 1). An image is formed as shown in a), and recording information is optically written by the semiconductor laser 7.

The semiconductor laser used at this time has an output wave [82
Particular preference is given to using a GaAs bonding laser from 0 to 840 nm. There is no apparent change such as discoloration at the imaging point 4 (light irradiation area) 3, but the AZ compound in this area absorbs light and generates heat, and this heat generation causes the light irradiation area to change. The finely powdered DA compound crystal contained in 3 is melted, and this portion becomes an amorphous state, and the highly ordered orientation of the DA compound molecules is disturbed. As a result, the light irradiation area 3 is exposed to the 11-year light beam in the 11th stage of the light and heat treatment that will be performed later.

The laser beam irradiation conditions for this writing are as follows:
It may be selected as appropriate depending on the configuration of the optical recording medium used, but at least the temperature of the light irradiation site 3 is sufficient to melt the DA compound crystal fine powder and disturb the orientation order of the DA compound molecules, and Memo! The temperature must be such that it does not destroy the layer or change its shape.

In this way, the highly ordered orientation of DA compound molecules is maintained in the finely powdered DA compound crystals due to the difference in the level of molecular orientation in the recording layer (when not irradiated with light). °) A latent image of the region 3 in which the highly ordered orientation of the DA compound molecules formed in the region 4 is disturbed (irradiated with light) is formed and recorded as shown in FIG. 1(a). Information is outdated.

Note that the DA compound has no sensitivity to the above-mentioned semiconductor laser, and such optical aging is not possible with conventional optical recording media made only of the DA compound.

Here, as described above, since no recorded information is recorded in the recording layer 2 as an optically detectable image, the written recorded information cannot be read at this stage.

Therefore, if it is desired to read recorded information, it is necessary to visualize the latent image formed on recording W#2.

This latent image is visualized by irradiating the recording medium with ultraviolet rays.

By this ultraviolet irradiation, the DA compound in the DA compound crystal in the portion 4 that was not irradiated with light during writing in the recording layer, which maintains its highly ordered orientation, is removed from the mold and transformed into a polydiacetylene derivative compound. However, this part of the recording layer is: 820 to 66 as shown in tS1 figure (b).
The color changes to a blue film 6 having a maximum absorption wavelength of 0 nm.

- On the other hand, in the part 3 that was irradiated with infrared rays during the optical writing S process, as mentioned above, the highly ordered orientation of the DA' compound is disturbed, so the out-of-type reaction of the DA compound is difficult to occur. In this part, discoloration to a blue film as in the non-irradiated area 6 does not occur. Therefore, the latent image part 3 formed during the previous writing remains the color of the original recording layer, which is almost colorless and transparent, and is irradiated with ultraviolet rays. It remains in the film 6 which has turned blue due to the treatment, and is visualized as a white part 5 that can be optically distinguished from the blue film 6.

In addition, after this ultraviolet irradiation treatment is completed, if necessary, RM2 can be heated to about 50°C or higher.
As the polydiacetylene derivative material in the blue film 6 changes color to red as described above, the recorded information written in the recording layer 2 as a latent image is visualized as a white part 5 in the red film. be able to.

For this heating treatment of the recording layer, a heating means such as a heater is used, or the recording layer absorbs radiation and generates heat.
Since the Z compound is contained, it can be carried out by irradiating the recording layer with radiation such as infrared rays.

Hereinafter, the optical recording method of the present invention using a recording medium having a recording layer of a mixed ice layer L, . When using a recording medium that is
As shown in Figure (L), a layer 9 containing an AZ compound is formed. When the laser beam 7 is irradiated in this manner, the AZ compound contained in R9 absorbs the laser beam 7 and generates heat, and this heat generation causes the image point 3 of the layer 8 containing the DA compound to be
The two parts melt and a latent image is formed as shown in the process described above. This latent image is formed by the above-mentioned ultraviolet irradiation treatment, or by further heat treatment as necessary:
The spring color shown in FIG. 2(b) can be visualized as a white part 5 that can be optically distinguished from the red IA 6.

In addition, the optical recording medium used was a disk-shaped disk (optical disk) in the two-layer example, but of course, DA
Depending on the compound ladle and the type of water plate supporting the recording layer containing the AZ compound.

Optical tape, optical cards, etc. can also be used.

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

(1) Since the AZ compound and each diacetylene derivatized frame are used in combination in the recording layer, optical writing is possible using a compact light semiconductor laser, and high-density,
High-speed recording with high sensitivity is possible. Moreover, the recorded information is recorded as a latent image on the recording medium, and then the recorded information can be visualized and reread as needed. (2) The recording layer is formed with uniformity and good surface properties. Therefore, it is possible to perform high-quality optical recording with excellent performance stability.

(3) Optical recording using an inexpensive recording medium having a highly homogeneous, large-area recording layer becomes possible. [Example] The present invention will be explained in more detail below based on an example.

Example 1 General formula Cl2H25-C: 1iEc-CB-C8H11
1 part by weight of fine crystal powder of a diacetylene derivative compound represented by 3'-COOH and 15 parts by weight of the AZ compound represented by dye No. 1 above were added to 30 parts by weight of methylene chloride, and the mixture was sufficiently stirred and applied. Prepared as a liquid.

Next, a glass disk substrate (thickness 1.5 mm).

(diameter 200 mm) was attached to the spinner coating base.

After dropping a small amount of the coating liquid onto the center of the disk substrate,
Apply by rotating a spinner at a predetermined number of rotations for a predetermined time,
When dried at room temperature, the thickness of the coating film after drying on the substrate is 50%.
Recording media for 0 people, too many people, and 2000 people were created.

Using the recording medium thus obtained, the optical recording method of the present invention was carried out as follows.

First, each of the above-mentioned recording media was irradiated with a semiconductor laser having a wavelength of 830 nm (laser beam diameter: Igm, irradiation time: 200 ns, 71 dots, output: 3 mw) according to input information to form a latent image. At that time, no apparent change was observed in the light irradiated portion of the recording medium.

Next, after writing with this semiconductor laser was completed, the recording medium was uniformly and sufficiently irradiated with ultraviolet rays having a wavelength of 254 nm. Then, the area other than the area irradiated by the semiconductor laser during writing at the end of the recording layer of the recording medium changes color to blue, and the latent image formed earlier, that is, the negative image in which the area irradiated by the semiconductor laser becomes white, becomes blue. visualized.

The evaluation of this memory result is shown in Table 1. The evaluation was based on a comprehensive evaluation of the quality of the sensitivity 1 image resolution and the contrast between the white part and the periphery, with particularly good results being given O1, good results being O1, and cases where recording was not possible or poor being graded X.

Example 2 The amount of diacetylene derivative compound is 1Jl parts.

The amount of AZ compound was 10 parts by weight, and the amount of methylene chloride was 21 parts by weight.
Example 1 A mixed solution expressed as parts by weight was used as a coating liquid.
A recording medium was created using the same method.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize the negative image. was evaluated. The results are shown in Table 1.

Example 3 The amount of diacetylene derivative compound is 1 part by weight.

The amount of AZ compound was 5 parts by weight, the amount of chloride and tyrene was 1 part by weight.
A recording medium was prepared in the same manner as in Example 1 using a mixed solution of 2 parts by weight as a coating liquid.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 1.

Example 4 The amount of diacetylene derivative compound is 1 part by weight.

A recording medium was prepared in the same manner as in Example 1 using a mixed solution containing 1 part by weight of the AZ compound and 4 parts by weight of methylene chloride as a coating liquid.

After carrying out 10-light recording on the thus obtained recording medium in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. did. The results are shown in Table 1.

Example 5 The amount of diacetylene derivative compound was 53]1 part, AZ,
A recording medium was prepared in the same manner as in Example 1 using a mixed solution containing 1 part by weight of the compound and 12 parts by weight of methylene chloride as a coating liquid.

After performing optical recording on the recording medium in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 r5n ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 1.

Example 6 A mixed solution containing 10 parts by weight of the diacetylene derivative compound, 1 part by weight of the AZ compound, and 20 parts by weight of methylene chloride was used as a coating liquid, and the same method as in Example 1 was carried out. Created a recording medium.

After optical recording was performed on the recording medium thus obtained in the same manner as in Example 1, the recording medium was
The negative image is visualized by uniformly and sufficiently irradiating it with ultraviolet rays.
This was evaluated. The results are shown in Table 1.

Example 7 A mixed solution in which the amount of the diacetylene derivative compound was 15 parts by weight, the amount of the AZ compound was 1 part by weight, and the amount of methylene chloride was 30 parts by weight was used as the coating liquid, and the same solution as in Example 1 was prepared.
A recording medium was created using the method.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 1.
・Table 1 Examples 8 to 14 After performing optical recording and visualization of negative images in the same manner as in Examples 1 to 7, each of the recording media was heated to about 80°C to remove the blue background. A negative image changed to red was obtained. This negative image was evaluated using the same criteria as in Example 1 at I/1, and the results are shown in Table 2.

Table 2 Example 15 General formula Cl2H25-Cmic-c=c-cBH16-C
In place of the sulfur diacetylene derivative compound represented by OOH,
General formula C6H17-CmiC-CmiC-C2H4-C0O
Example 4 except that a compound represented by H was used.
A recording medium was created using the same method.

After optical recording was performed on the thus obtained recording medium in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to form a negative image into an aim, and this was evaluated. The results are shown in Table 3.

Example 16 Dye No. Replaced with AZ compound represented by l.

A recording medium was prepared in the same manner as in Example 15, except that dye No. 5 was used.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 3.

Example 17 In place of the AZ compound represented by dye No. 1, dye No.
A recording medium was prepared in the same manner as in Example 15, except that the ^Z compound represented by 8 was used.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 3.

Example 18 In place of the AZ compound represented by dye No. 1, dye No.
A recording medium was prepared in the same manner as in Example 15, except that the AZ compound represented by No. 13 was used.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 3.

Example 19 Instead of the AZ compound represented by dye NO.1.

A recording medium was prepared in the same manner as in Example 15 except that the AZ compound represented by dye No. 17 was used.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize the image. evaluated. The results are shown in Table 3.

Table 3 Example 20 A fit portion of AZ compound 11i represented by dye No. 1 was dissolved in 10 parts by weight of 77 tonitrile to prepare a coating liquid A.

Apart from this, C12H2S-Ci=C-C=C-CBH
Diacetylene derivative compound crystal fine powder represented by le-COOH 1! l! A certain amount was added to 10 parts by weight of benzene and thoroughly stirred to prepare a coating liquid B.

Next, a glass disk substrate (thickness 1.5 mm).

200 mm in diameter) in a spinner coater, first drop a small amount of the coating liquid A onto the center of the disk substrate, then apply by rotating the spinner at a predetermined rotation speed for a predetermined time, and dry at room temperature. Then, the substrate on which the AZ compound-containing layer was formed was placed on the spinner coating machine again, and the surface of the AZ compound-containing layer on the previously formed disk substrate was coated. After dropping a small amount of the coating liquid B onto the center area, the spinner is rotated at a predetermined number of rotations for a predetermined time to apply the coating solution, and the coating solution is dried at room temperature to form a layer containing the DA compound on the layer containing the AZ compound. Calendar Tonita.

In addition, the film thicknesses of the layer containing the AZ compound and the layer containing the DA compound were varied as shown in Table 4A, and sample N
25 types of recording media, ranging from 20-'1 to 20-25, were obtained.

After optical recording was performed on the recording medium thus obtained in the same manner as in Example 1, 254 nm was recorded on the recording medium.
The negative image was visualized by uniformly and sufficiently irradiating it with ultraviolet rays and evaluated. The result.

Shown in Table 4B.

Coating liquid B has the general formula Cl2H'25-C-ctic-
Instead of the diacetylene derivative compound represented by C9H15-COOH, the general formula C9H17-C-C-CTC-
Sample Nos. 21-1 to 21- as shown in Table 5A were prepared in the same manner as in Example 20 except that a diacetylene derivative compound represented by C2Ha-COOH was used.
(＾OHu＾Number) Navy blue Ak eJTh Table 1 After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly exposed to ultraviolet rays of 2541 m. After sufficient irradiation, the negative image was evaluated.The results are shown in Table 5B.

Example 22 Table 6A was prepared in the same manner as in Example 21, except that AZ compounds represented by dyes 11N, o, 5 were used in coating solution A instead of AZ compounds represented by dyes No. 1. Sample No. as shown in .

Create 25 types of recording media from 22-1 to 22-'25.
i<, t'ML@1 k After optical recording was performed in the same manner, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to convert the negative image into an IO image, and this was evaluated. The results are shown in Table 6B.

Example 23 The methods shown in Table 7A were prepared in the same manner as in Example 21, except that the AZ compound represented by Dye No. 8 was used instead of the AZ compound represented by Dye No. 1 in coating solution A. Sample No. as shown.

25 g recording media of Nos. 23-1 to 23-25 were prepared.

After performing optical recording on the recording medium thus obtained in the same manner as in Example 1, the recording medium was uniformly and sufficiently irradiated with 254 nm ultraviolet rays to visualize a negative image, and this was evaluated. . The results are shown in Table 7B.

Table 4A ffi　4B・Table ・Table 5A Table 5B Table 6A Table 6B Table 7A Table 7B

[Brief explanation of drawings]

FIGS. 1(a) and (b) and FIGS. 2(a) and 2(b) are schematic cross-sectional views showing one aspect of the structure of an optical recording medium used in the method of the present invention and the optical recording process.

Claims (2)

[Claims] (1) Diacetylene derivative compound and the following general formula (I
), an optical recording medium having a recording layer containing an azulenium salt compound having a skeleton represented by
It is characterized by comprising a step of irradiating 0 nm infrared rays according to the recorded information to form a latent image, and a step of irradiating the recording medium on which the latent image is formed with ultraviolet rays to make the latent image visible. optical recording 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.) (2) The optical recording method according to claim 1, wherein the recording medium on which the latent image is formed is irradiated with ultraviolet rays and then further heated to visualize the latent image.