JPS62176889A - Optical recording method - Google Patents

Abstract

PURPOSE:To make it possible to form discoloration recording and pit recording to a recording medium by changing the amount of light exposure of semiconductive laser beam, by having a specific polymethylene compound and a polydiacetylene derivative contained in the recording layer of an optical recording medium in combination. CONSTITUTION:An optical recording medium having a recording layer 2 containing a polydiacetylene derivative and one or more of a polymethylene compound represented by general formula I or II is formed. Next, recording information is converted to an optical signal by a semiconductive laser beam through a control circuit to be formed into an image on the recording layer 2 of the optical recording medium. The amounts of light exposure at image forming points (areas) 3a, 3b are controlled to quantity Q1 sufficient to heat the polydiacetylene derivative for discoloration recording to about 50 deg.C or more but to set the recording layer 2 to non-melting temp. and quantity Q2 sufficient to melt the recording layer 2 for pit recording (Q1<Q2).

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an optical recording method using an optical recording medium, and in particular, it is possible to use a combination of color change recording and bit recording, that is, ternary recording, on one optical disc. The present invention relates to an optical recording method that enables high-density, high-sensitivity optical recording even when a low-output r-conductor laser is used, and is advantageous in terms of energy saving.

[Conventional technology]

Recently, optical recording media such as optical disks, optical tapes, and optical cards (hereinafter collectively referred to as optical disks) have been attracting attention as central players in office automation. For example, an optical disc has the advantage that it is possible to record a large amount of documents, literature, etc. on a single disc, so that documents, etc. can be organized and managed efficiently in an office.

The recording layer used in such optical disc technology can store high density information using optically detectable small (eg 1 micron) dots in the form of spiral or circular tracks.

The disk used in this optical disk technology has a recording layer made of a material sensitive to laser, for example.
: A typical configuration is provided on a board. To write information by +1 on this disk, a laser beam focused on the laser sensitive layer (recording layer) is scanned, dots are formed only on the surface irradiated with the laser beam, and the dots are formed according to the recorded information. Formed in the form of a spiral or circular track. That is, the laser-sensitive layer can absorb laser energy to form dots that can be optically detected. For example, in the heat mode recording method, the laser-sensitive layer absorbs thermal energy and can form dots consisting of small recesses (pits) at that location by evaporation or melting. In another heat mode recording method, the absorption of irradiated laser energy can form a dot of optically detectable discoloration at that location.

Information recorded on this optical disk is detected by scanning a laser along a track and reading optical changes in areas where dots are formed and areas where dots are not formed. For example, when using a disk having a recording layer provided on the reflective surface of an L plate, a laser is scanned along a track, and the energy reflected by the disk is monitored by a photodetector. In the case of pit recording, the output of the photodetector is low in areas where pits are not formed, while in areas where pits are formed, the laser beam is partially reflected by the reflective surface of the underlying layer. The output of the photodetector becomes larger.

The recording layer of such optical discs has traditionally been made of a variety of materials, including metal thin films such as aluminum vapor-deposited films, bismuth thin films, tellurium oxide thin films, and chalcogenide amorphous glass films that mainly use inorganic materials. have been considered, but recently a method using 41 materials has been attracting attention due to its cost and ease of manufacture.

On the other hand, since the conventional heat mode method performs binary recording of whether dots are formed or not, there is a limit at L, which performs higher-density recording.

[Problem that the invention seeks to solve]

The present invention has been made to solve the problems of the prior art, and is disclosed in Japanese Patent Application Laid-open Nos. 59-40fi48 and 40fi.
By composing the recording layer of an optical recording medium by combining a polymethylene compound with a specific structure with good thermal stability and a diacetylene derivative compound disclosed in No. 649 and No. 40650, a single optical disc can record color change and bits. The record is 1 h in 11 days, which means 3 with 2 types of dots.
This device was developed based on the discovery that it is possible to record values, and even when using a low-output i-conductor laser, color change recording and bit recording can be performed at comparable high speeds.

One object of the present invention is to provide an optical recording method that enables three-value recording using two types of dots on one disc.

Another object of the present invention is to generate light using a small, lightweight, and low-output conductor laser! An object of the present invention is to provide an optical recording method that allows one recording and high-speed recording.

Another objective of the present invention is to provide an optical recording method that allows recording at higher density and higher sensitivity.

Still another object of the present invention is to produce optically recorded images of excellent stability and high quality! The object of the present invention is to provide an optical recording method that can perform the following steps.

(Step F for solving the problem) That is, the optical recording method of the present invention contains a bolycyacetylene derivative compound and one or more compounds represented by the following general formula (1) or (2). An optical recording medium having a recording layer consisting of a The process of forming a bit (however, Q.

<02).

General formula (1) General formula (2) (wherein, R1, R2, and RM each independently represent an aryl group which may have a substituent, and R4 and R
1- represents an arylene group which may have a substituent that forms a conjugated double bond system with two adjacent -cu=cu- groups, and R6 represents hydrogen or an arylene group which may have a substituent. J and t are represented, and A represents the anion residue.

) The cyasedilene derivative compound (hereinafter abbreviated as compound to F and D) contained in the optical recording medium used in the method of the present invention is defined by the following general formula % formula % (wherein 1 (and R' is a polar J ,t, ,Polarity”,
(optionally substituted with, alkyl group, cyclohexyl J
, t, saturated aliphatic hydrogen such as "^;rod", (even if substituted with vinyl J, (, olefinic hydrocarbon group such as propenyl group; or even if substituted with a polar group) Good, phenyl group, naphthyl''^, alkylphenyl J
, ξ)', fi group hydrocarbon group, and the polar J1L here includes, for example, carboxyl J^ or its metal or amine salt, sulfonic acid J, ζ or its metal or amine salt, sulfamide group, Amido”
1 (, amino group, imino J^, hydroxy group, oxyamino J^, diazonium J, t,, guanidine group, hydrazine group, phosphoric acid group, silicic acid J, (, aluminate Jlc
, nitrile J^, thioalcohol group, nitro J, (and halogen radical = r-), and polymers thereof.

On the other hand, in 11 used in the present invention, general formula (1) or (2)
) (hereinafter abbreviated as polymethylene compound) is a compound that has an absorption peak in a wavelength range of 800 nm or more and generates heat by infrared light of this wavelength.

To explain this polymethylene compound more specifically, in general formulas (1) and (2), A, R2 and R4
does not represent a phenyl group which may have a substituent, aryl J such as naphthyl J^, or L, respectively.

Examples of substituents include substituted amino groups such as dimethylamino, diethylamino, dipropylamino, dibdelamino, diphenylamino, phenylbenzylamino, and phenylethylamino, cyclic amino groups such as morpholino, piperidinyl, and pyrrolidino, methoxy, and ethoxy. , alkoxy J such as butoxy, (R4 and R
″′ is ρ-phenylene, 1.4=naphdylene, etc., two adjacent −(:11= to II −J, % and conjugated 21
[Arylene J, II, which may have a 1-substituent forming a bond system, is not represented.] Here, the substituted J and t include halogens such as chlorine, bromine, and iodine, alkyls such as methyl and ethyl, (alkoxys such as methoxy and ethoxy), and L. R6 is hydrogen or a substituent. ``phenyl'', (, represents aryl J, t of naphthyl JL kf. Examples of substituents include the same as those exemplified for A to R'.
, (For example, anus?, CI line, ct;, c island,, ,
,(-),1:'l,i,,P,etc.)7,a 't
” > Original r1, flso, , &-1+, so,
, θ θ C, HlSOi, C,, H7SOi', C, Ht,
SO,,,[:4. H11S[]3, C6H13S0
3, θ θ [;H,>, e i:H,4(:II(:1sO3,CI(:II,CH
,S(],, ,ll-5oj.

(:Hl.

θ Alkylsulfonic acid compounds such as ICH7SO3, (Σ
Hensensulfonic acid compounds such as t(:lI, S method, ct(tall Σ [81, S), etc.
. OAS [:H, (:II, S method, out (co,),,s
Nada θ. , SCH,C11,-0-co,cH,soj,
', alkyl disulfonic acid compounds, and cen disulfonic acid compounds.

Specific compound sequences are listed below.

Dimensions
B8 Threat
8ζ5
;5=me:
l: Engineering JCJ 6 ke 9
Cte(pu ζ5
<5S
G 6 Teζ5
ζtsu
ζmed
Takashi ζ5 2
8 ε85]
8
923 ε8
ε8o 8
95 et al.
8 minutes 5 seconds
〇)
0 9
♂ 口 5 ε The optical recording medium used in the present invention contains the foregoing compound and the polymethylene compound, and may have a one-layer mixed system, a two-layer separated system, or a multilayer laminated system.

Here, the single-layer mixed system refers to a system consisting of a mixed layer of a compound D and a polymethylene compound, and the two-layer separated system refers to a system consisting of a mixed layer of a D compound and a polymethylene compound.
A multi-layer laminated system refers to a system in which a layer containing a compound and a layer containing a polymethylene compound are laminated separately, for example, D.
A structure that does not include a two-layer separation system in which one or more layers containing an acetate compound and one or more layers containing a polymethylene compound are laminated in a predetermined number and order. .

A typical configuration of the optical recording medium used in the present invention is shown in Figure 1 (^
) and shown in FIG. 1 (II). FIG. 1 (8) shows a single layer mixed recording layer 2 provided on the substrate 1, and FIG. A recording layer 2 consisting of a first layer 2a and a layer 2b containing a polymethylene compound is provided on a substrate 1.

To form the recording layer 2, 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 a polymethylene compound in a suitable volatile solvent;
This coating solution is coated on the substrate 1, and in the case of a two-layer system or a multilayer system, a coating solution containing a fine crystalline powder of a DA compound and a coating solution containing a polymethylene compound are applied. They may be prepared separately and applied to the substrate 1 in a predetermined order.

As the substrate l of the optical recording medium used in the present invention, glass,
Extrapolation support materials such as plastic plates such as acrylic resin, plus deck films such as polyester, paper, and metal can be used, but recording is performed by irradiating radiation from the substrate side1.
- In this case, one that transmits recording radiation of a specific wavelength is used.

The solvent of the coating liquid used to form the single-layer mixed recording layer is appropriately selected depending on the type of binder used and the types of compound and polymethylene compound, 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; Nisdels 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.

In addition, suitable solvents for polymethylene compounds include alcohols such as methanol, ethanol, and isopropanol; acetone, methyl ethyl ketone, and cyclohexanone; Ketones; Amides such as N,N-dimethylformamide and N,N-dimethylacetamide; Sulfoxides such as dimethylsulfoxide; Needle necks such as detrahydrofuran, dioxane, and ethylene glycol monomethyl ether; Methyl acetate, ethyl acetate , butyl toroate and other Nisdels: chloroform, methylene chloride, dichloroethylene, carbon tetrachloride,
Aliphatic halogenated hydrocarbons such as trichlorethylene;
Or benzene, toluene, xylene, ligroin,
Examples include aromatics such as monochlorobenzene.

Suitable dispersion media for the D formula compound include aliphatic hydrocarbons such as 1-hexane, n-heptane, n-octane, and cyclohexane. However, the D formula compound is a compound with strong crystallinity. Therefore, even if IU is dissolved in a solvent and this solution is applied to the substrate 1-, it will be +1 [
Crystallization progresses and dalein is obtained. Therefore, not only a dispersion but also a solution of the compound of formula D may be used.

As the solvent in this case, the same solvents as those mentioned above as the solvent for the polymethylene compound can be used.

Incidentally, a binder made of a natural or synthetic polymer may be appropriately added to each coating liquid in order to improve the adhesion with the plate or with other layers. Furthermore, various additives may be added to measure the stability and quality (Z) of the recording layer 2.

Coating of such coating 111 liquid onto the plate 1 can be done by spinner rotation coating method, dip coating method, spray coating method, bead coating method, wire bar coating method, blade coating method, roller coating method, curtain coating method. The F method is used.

When the recording layer 2 is of a mixed type, the thickness of one copy is 400 mm.
Approximately 2 to 2 people are suitable, and a range of 1000 to 5000 people is particularly preferred. In addition, in the case of a two-layer separation system, the thickness of each layer is suitably about 200 to 1-1, especially about 200-50.
A range of 000 people is preferred. Furthermore, in the case of a multilayer laminated system, both the sum of the film thicknesses of the layers containing the individual D formula compounds and the sum of the film thicknesses of the layers containing the individual polymethylene compounds are:
100 people! Scale size is suitable, especially 200-500
A range of 0 people is preferred.

The blending ratio of the D-type compound and the polymethylene compound in the recording layer 2 is preferably about 1715 to 15/1, and optimally! /lO~1071.

Note that, if necessary, various protective layers may be submerged in the recording layer 2 configured in this manner. Further, the method of the present invention can be carried out regardless of the lamination order of the outer layers in the case of a two-layer separation system or a multi-layer lamination system.

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

In this optical recording medium, when light is applied to the D compound (excluding mixtures), the absorption wavelength of the recording layer changes and the apparent color changes. That is, the D formula compound (excluding mixtures) is initially transparent with almost 11 colors, but when irradiated with ultraviolet rays, it mixes and changes into a polydiacetylene derivative compound. This mixing occurs only by irradiation with ultraviolet light and not by the application of other physical energy such as heat. As a result of this 10 cases, fi 20~6 [ion
The maximum absorption wave 1 (begins to hit m) and changes to 11+'' color or dark color.The change in hue of J and L in this mixture is inversely changed by 1-1 color, and once i'1 color The recording layer that has changed to a dark color is j1! (the color does not return to a transparent film).

The recording layer containing the polysulfur 7 cetylene derivative compound and the polymethylene compound, which have a color of +1 to 11 (A) to Llf, generates heat at a temperature corresponding to the exposure amount of the irradiated light. At that time, without the recording layer 2 melting,
When the polydiacetylene derivative compound is heated to about 50° C. or higher, the exposed portion of the recording layer has a maximum absorption wavelength of about 540 nm and turns into a red film.

Note that this change to a red film is also an irreversible change.

Further, when the exposed area is raised and the amount of exposure exceeds a certain limit, the exposed area of the recording layer melts.

The optical recording method of the present invention performs recording by utilizing the characteristics obtained by the combination of such a compound and a polymethylene compound. This recording method will be described in detail above.

As the i-conductor laser used in the method of the present invention, it is particularly suitable to use a GaAs junction laser with an output wavelength of 800 to 150 nm.

When carrying out the optical recording method of the present invention, if an optical recording medium is used that has an optical recording layer composed of a D^ compound (excluding a mixture) and a polymethylene compound, first, recording is performed. The entire layer is irradiated with ultraviolet light. By this irradiation with ultraviolet rays, the compound (excluding the polymer) is combined with D in the recording layer, changing to a polydiacetylene derivative compound, and the recording layer changes color into a blue to dark film. (Of course, this operation is not necessary for those that have a recording layer using a polydiacetylene derivative compound as a compound in V and D.) On the other hand, the recorded information is converted into an optical signal by a semiconductor laser via a control circuit. be done. This optical signal passes through an optical system and is placed, for example, on an optical recording medium mounting means, and is placed at a predetermined position on a synchronously rotating disc-shaped optical recording medium having a single-layer mixed recording layer (see FIG. 2). The image is formed as shown in 8). The imaging position is the recording layer 2 of the optical recording medium.

The exposure amount at the imaging points (sites) 3a and 3b is approximately 50% of the polydiacetylene+7A conductor compound for color change recording.
℃ or higher, with a sufficient amount (Q+) to bring the recording layer 2 to a temperature that does not melt it, and '+i-([b)] sufficient to melt the recording layer 2 for pit recording. ;
Fu is controlled (+2.<07).

To change the exposure of the imaging point: 11 in this way, 'l
': 4q, methods such as changing the intensity of the body laser, changing the laser irradiation time, or using a combination of these may be used. In addition, two types of exposure: 1
II to carry out the irradiation? ! Alternatively, the above-described control may be performed using a single conductor laser, or a plurality of four-conductor lasers capable of obtaining the "older exposure: I" may be used.

The polymethylene compound present at the imaging points (sites) 3a and 3b absorbs this laser beam 4 and generates heat.

Here, the imaged point 3a that has received 11 ``exposure of 0 and 1'' changes to red because the polydiacetylene derivative compound is heated by the heat generated by the polymethylene compound, and as shown in FIG. 2(B). As shown, the dots 5a are made up of a discolored area that is distinguishable from the blue or dark color of the unexposed area. In addition, D.A.
In an optical recording medium in which a recording layer consisting only of a compound is recorded, a polydiacetylene derivative compound
Because it has no sensitivity to lasers with wavelengths of
When using a semiconductor laser of this wavelength, optical recording due to color change was impossible.

On the other hand, the imaging point 3b that has received the exposure: crossroads of q2, which has sailed, is
Due to the heat generation of the polymethylene compound, that portion is melted, and a pit consisting of a recessed portion 5b is formed as shown in FIG. 2 (11).

In this case, since the recording layer 2 of the optical recording medium used in the present invention is constituted by a combination of a polymethylene compound and a polydiacetylene derivative compound as described above, that is, due to the presence of the polydiacetylene derivative compound, the recording layer 2 The energy required for melting the polymethylene compound can be significantly reduced, and pit formation by the polymethylene compound is greatly promoted.

In this way, the discolored portion 5a is formed on the recording layer 2 according to the manual information.
Optical recording using two different types of dots, ie, ternary recording, is carried out using dots having two different shapes, ie, the pits 5b and 5b. Moreover, since the optical recording medium used in the present invention has high sensitivity to both color change recording and pit recording, such ternary recording can be performed at high speed.

The case where an optical recording medium having a 1-layer mixed recording layer is used has been described above, but when a two-layer m system as shown in FIG. 1 (11) is used, the image forming point: La and 3b are layers 2b containing a polymethylene compound, as shown in FIG. 3 (8). When the laser 4 is irradiated in this way, the image forming points 3a and 3b are exposed 1itQ+ according to the recorded information.
, q2, the polymethylene compound generates heat, and as shown in FIG. 3(II), dots 5a consisting of discolored portions or pits 5b consisting of concave portions are formed.

The two types of dots recorded in the above manner can be read both at once or only one of them, as desired.

In addition, as the optical recording medium, in the above example, a disk-shaped disk (optical disk) was used, or of course, it supports a recording layer containing a compound and a polymethylene compound.''111: By inserting a plate, an optical Tape and optical card shades can also be used.

〔Effect of the invention〕

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

(1) Since a combination of a polymethylene compound and a polydiacetylene 1A conductor compound is used in the recording layer,
Color change recording and pit recording can be performed on a single recording medium using a compact light IX conductor laser. Namely.

High-density recording using ternary recording on a single recording medium is an IIT capability. Moreover, the recording layer has high sensitivity in both color change recording and pyyl' recording, and high-speed recording is possible.

(2) Since the recording layer is formed uniformly and with good surface properties, it is possible to perform optical recording with excellent stability and high quality.

(3) Optical recording using an inexpensive recording medium having a highly homogeneous, large-area recording layer becomes possible.

〔Example〕

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

Example 1 General formula〇, 2 H, , -c=f knee c=+nee c,,
)It, diacetylene derivative compound crystal fine powder represented by -cOoll 11j: 11 parts and compound/a
15 ton II parts of a polymethylene compound represented by 2 were added to 11i parts of methylene chloride 3 Q II'C, and 1
The mixture was stirred for - minutes and prepared as a coating solution.

Next, a glass disk substrate (thickness 1.5 mm, diameter 200 mm) was attached to a spinner coater, and after dropping the coating liquid described in step 11 in a slow motion onto the center of the disk substrate, it was coated at a predetermined rotation speed. Rotate the spinner for an hour and dry it at room temperature until the thickness of the coating 1112 on the substrate after drying is 50 mm.
0 people, 1000 people, and 2000 people created their own recording media.

Each of the optical recording media obtained in this way was first given 25
The recording layer was uniformly and sufficiently irradiated with 4 nm ultraviolet rays to turn the recording layer into a blue film.

Next, the laser output can be varied by 8:1 to each of the optical recording media having the recording layer in which this portal color is obscured.
Semiconductor laser with a wavelength of Onm (maximum ratio lOmW,
Laser beam diameter: 1 scale, irradiation time: 200ns/1
A dot) was irradiated according to manual information, and the optical recording of the present invention was carried out. Note that the laser output was set to 8 mW when a bit recording command was issued, and the laser output was set to 4 mW when a color change recording command was issued.

The evaluation of the recording results is shown in Table 1. The evaluation is based on a comprehensive evaluation of the sensitivity, resolution, and contrast ratio between recorded and non-recorded areas for both bit and color change recording. Bad items were marked as ×.

Example 2 Diacetylene, derivative compound:1::I tun:1i
Coat a mixed solution containing 10 parts by weight of polymethylene compound +, ) and 20 tons: 11 parts of methylene chloride.
An optical recording medium was prepared in the same manner as in Example 1 using the liquid Ii.

Each of the IH+ optical recording media was first uniformly irradiated with 254 nm ultraviolet light for a period of - minutes to form a recording layer with a single kidney color film, and then optical recording was performed in the same manner as in Example 1. , evaluated this. Table 1 shows the evaluation of the recorded results.

Example 3 A mixed solution containing 1 part by weight of the diacetylene derivative compound, 5 parts by weight of the polymethylene compound, and 121 parts by weight of methylene chloride was used as a coating solution. An optical recording medium was prepared in the same manner as described above.

Each of the optical recording media obtained in this way was first given 25
After uniformly irradiating 4n+n ultraviolet light for 1 minute to make the recording layer a +11 color film, optical recording was carried out in the same manner as in Example 1, and this was evaluated. Table 1 shows the evaluation of the recorded results.

Example 4 A mixed solution in which 117 of the diacetylene derivative compound is I + lj total, 117 of the polymethylene compound is 1IR part, and 11 of partial methylene is 4 i'l ;1i part is used as the first coating solution. An optical recording medium was prepared in the same manner as in Practical hh Example 1.

Each of the optical recording media obtained in this way was first given 25
The recording layer was irradiated uniformly with 4 nm ultraviolet light at a rate of 1 min.
After forming a 11-color film, optical recording was performed in the same manner as in Example 1, and the results were evaluated. The shear values of the recorded results are shown in Table 1.

Example 5 51 parts of diacetylene derivative compound 111, 11 parts of jf of polymethylene compound, methylene chloride:
An optical recording medium was prepared in the same manner as in Example 1 using a mixed solution containing 11 parts and 12 parts as a coating liquid.

In this way, each of the (f/) optical recording media was first uniformly and sufficiently irradiated with 254 nm ultraviolet rays to make the recording layer a paleochrome film, and then optical recording was performed in the same manner as in Example 1. The 1X degree values of the recorded results are shown in Table 1.

Example 6 A mixed solution containing 111 parts by weight of a diacetylene 1 rust conductor compound, 71 parts of -1 of a polymethylene compound, and 20 qj and izi parts of methylene chloride was used as a coating liquid. An optical recording medium was produced in the same manner as in Example 1.

In this way, each of the 1itk optical recording media was first uniformly irradiated with 254 nm ultraviolet light for 1 minute to make the recording layer 11 color + + q, and then optical recording was performed in the same manner as in Example 1. was evaluated. The values of the recorded results are shown in Table 1.

Example 7 Diacetylene derivative compound i, l: I 5 +lj
Part, polymethylene (tl-compound lit is l+Ij
An optical recording medium was prepared in the same manner as in Example I using a mixed solution containing 1:[ and 10+l'j;J parts of methylene as the coating solution 11i.

Each of the optical recording media obtained in this way was first given 25
After uniformly and sufficiently irradiating the recording layer with 4nII+ ultraviolet rays to turn the recording layer into a blue film, optical recording was carried out in the same manner as in Example 1, and this was evaluated. Table 1 shows the 1-it value of the recorded results.

Example 8 General formula “17H7!+Cmi(neeCEC-C,,H,
6-[:0 Instead of the cyasedilene conductor compound represented by the leaf, the general formula CIIH17-C3C-C=G-C,H,
An optical recording medium was prepared in the same manner as in Actual bK Example 4, except that the compound represented by -1:0011 was used.

Each of the optical recording media obtained in this way was first given 25
Uniformly and sufficiently irradiate the recording layer with 4 nm ultraviolet rays to
After the F-color film was incorporated, optical recording was carried out in the same manner as in Example 1, and this was recorded. Table 2 shows the +if values of the recorded results.

Example 9~! 3. An optical recording medium was prepared in the same manner as in Example 8, except that the polymethylene compounds represented by compounds Al1L'I, 9.19.29 and 36 were used instead of the polymethylene compound represented by compound 1&2. Created. Each of these optical recording media was first uniformly and sufficiently irradiated with ultraviolet rays of 254r+m to encapsulate the recording layer with an i'i color film, and then optical recording was carried out in the same manner as in Example 1. I valued it. Table 2 shows the evaluation of the recorded results.

Example 14 Polymethylene compound represented by compound Sui 7: 1
Dissolve 1 part in 10 ton parts of acetonitrile, and
It was called Hi liquid A.

Apart from this, Cl78)'・, -C=(nee Cmi G-C
,,)l,, -COO11 crystal fine powder ll'RiI'c part is mixed with benzene l
011C: It was added to 'd part and stirred sufficiently to prepare coating liquid B.

Next, a glass disk substrate (thickness 1.5 mm, diameter 200 mm) was mounted on a spinner coater, and after first applying a small amount of coating liquid A to the center of the disk substrate,
The coating was applied by rotating a spinner at a predetermined rotation speed for a predetermined time, and dried at room temperature to form a layer containing a polymethylene compound on the substrate. Next, the substrate on which the layer containing the polymethylene compound was formed was mounted on the spinner coater again, and a small amount of the coating liquid B (11) was dropped onto the center of the surface of the layer containing the polymethylene compound of the disc substrate 2 formed earlier. Thereafter, the coating was applied by rotating a spinner at a predetermined number of revolutions for a predetermined time, and dried at room temperature. One layer containing a DA compound was formed on the layer containing a polymethylene compound to form a recording layer.

In addition, the layer containing the polymethylene compound and the layer containing the compound D were variously changed as shown in Table 3, and 25 types of optical recording were performed for samples Makoto 14-1 to 14-25. Got the medium.

for each of the optical recording media thus obtained.

First, ultraviolet rays of 254 nm were uniformly irradiated for L minutes to cover the recording layer.

Next, optical recording was performed on an external optical recording medium in which this h-color 1-simulated recording layer was printed in the same manner as in Example 1, and the results were evaluated. Table 4 shows the evaluation of the recorded results.

Example 15 ``N I+i 'l Night B has the general formula [;,, H,,, -
CEC-CEc-C,, H,, - is replaced with a diacetylene derivative compound represented by 00+1, and general formula 〇. H,
,,-C=C-CE(nee C,)l,-(:0(111
Samples/a15-1 to I! as shown in Table 5 were prepared in the same manner as in the first example except that the diacetylene derivative compound represented by was used. '1-25 25 types of optical recording media were created.

Each of the optical recording media obtained in this way was first given 25
Uniformly and sufficiently irradiate the recording layer with 4 nm ultraviolet rays to
f color film was included.

Next, optical recording was performed on each optical recording medium having the +11-colored recording layer in the same manner as in Example 1, and the medium was rated with :'P. Table 6 shows the evaluation of the recorded results.

Table 6 Example 16 The compounds shown in Table 7 were prepared in the same manner as in Example 15, except that a polymethylene compound represented by the compound /L7 was used as the coating liquid A. Samples as shown/a16-1 to 16-25
25 types of optical recording media were created.

Each of the optical recording media obtained in this way was first given 25
Uniformly and sufficiently irradiate the recording layer with 4 nm ultraviolet rays to
A one-color film was created.

Next, optical recording was performed on each optical recording medium having the blue 11!2 recording layer in the same manner as in Example 1, and the results were evaluated. Table 8 shows the evaluation of the recorded results.

Table 8 Example 17 The same method as in Example 15 was used except that the polymethylene compound represented by Compound Sut 22 was used in Coating Iar Solution A instead of the polymethylene compound represented by Compound Sut No. 7. Twenty-five types of optical recording media were prepared for sample acids 17-1 to 17-25.

Each of the optical recording media obtained in this way was first given 25
The recording layer was irradiated uniformly with 4 nm ultraviolet light for 1 minute, and the recording layer was exposed to II
f color film was included.

Next, optical recording was performed on each optical recording medium having the +11 color recording layer in the same manner as in Example 1, and the results were evaluated. The evaluation of the recording results is shown in Table 1O.

Brief description of the drawings 1) 1-1 Description FIGS. 1(8) and 1(11) are schematic cross-sectional views illustrating one aspect of the structure of an optical recording medium used in the method of the present invention, and FIG. ), FIG. 2 (1υ), FIG. 3 (8), and FIG. 3 (B) are schematic cross-sectional views of an optical recording medium showing the optical recording process of the present invention, respectively.

Substrate 2: Recording layer 2a: Layer containing D^ compound 2b: Layer containing a polymethylene compound 3a, 3b: Exposure section 4: Laser beam 5a: Discolored area 5b=bit

Claims (1)

[Scope of Claims] 1) A polydiacetylene derivative compound and the following general formula (1)
) or (2) and an optical recording medium having a recording layer containing one or more of the compounds represented by (2) is irradiated with light whose exposure amount is controlled according to recorded information, and the exposed area of the exposure amount Q_1 is discolored. an optical recording method, comprising the step of forming a pit consisting of a concave portion in an exposed area with an exposure amount Q_2 (however, Q_1<Q_2). General formula (1) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(1) General formula (2) ▲There are mathematical formulas, chemical formulas, tables, etc.▼(2) (In the formula, R^1, R^2, R^ 3 represents an aryl group that may each independently have a substituent, and R^4 and R^5 are substituents that form a conjugated double bond system with two adjacent -CH=CH- groups. represents an arylene group which may have a substituent, R^6 represents hydrogen or an aryl group which may have a substituent, and A represents an anion residue.)