JPS62170040A - Method for reading optical recording - Google Patents

Abstract

PURPOSE:To attain the optical writing by an infrared ray and the read by a visual light by providing a recording layer comprising two kinds of specific chemical compounds. CONSTITUTION:Input information is converted into an optical signal by a semiconductor laser 2 via a control circuit 3 and the image is formed to the prescribed position of an optical recording medium via an optical system. The image is formed at a radiant ray absorbing layer including a croconicmethyne dye. Although the polyacethylene derivative chemical compound existing at the image focal point does not absorb the laser beam of the wavelength, the croconicmethyne dye absorbs the laser beam, is heated and the heat is delivered to the adjacent polydiacetylene derivative chemical compound, which is colored into red to execute the optical writing. Since the read light of the semiconductor laser 10 emitting a visual light of a wavelength of a range of 550-750nm has a low output and the wavelength is at the outside of an infrared ray region, the croconicmethyne layer of the light recording medium 1, reflected and converted into an electric signal at the photodetection face of a photodetector 12, and the reproduction read of the recording is applied via an output circuit 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention provides an optical record 9 containing a diacetylene derivative compound.
Regarding the method for reading optical recording of a medium, in particular, an infrared laser of 800 to 900 nm is used as a light recording means, and an infrared laser of 500 to 7 nm is used as an optical recording reading means. This article relates to an optical record reading method using ionm visible light.

(Prior Art) Recently, optical disks have become a central part of office automation systems. Optical discs can store large documents and documents on a single disc, making it possible to organize and manage documents in the office more efficiently. Meishin is being considered as a recording medium for this optical disc, but media using organic materials have been recommended due to cost and ease of manufacture.

Diacetylene derivative compounds are known as materials for such recording media, and by focusing on the thermochromic properties of these compounds, a recording technology for use as laser recording media was disclosed in JP-A-56-7807. has been done. However, this Specification 7 does not mention whether or not a 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 thermochromic recording is possible using a large +1+1 and high output laser such as an argon laser, but small 1fi relatively low-output i-conductor racer (wavelength 800-900n)
+n), laser recording is real 71i! i
I confirmed that it is not possible. However, for practical recording media such as optical disks, it is required that optical writing is possible using a small, low-power conductor laser, and that reading can be performed using a light-emitting diode or small (-2) laser. .

On the other hand, JP-A-59-181052 and JP-A-59-
No. 6044:1 discloses various croconic methine dyes, and organic compounds containing these dyes absorb radiation in the radiation wavelength range of semiconductor lasers and generate heat.
It is disclosed that so-called heat mode recording in which pits are formed using laser energy can be performed. However, when recording is performed by forming physical bits on the surface of a recording medium, the surface of the recording medium at the beginning is sufficiently smooth, and at the same time, the surface of the recording medium is not scratched even after recording. You will need enough notes to avoid 0, as well as
In particular, it has been relatively difficult to perform optical writing with high density, high sensitivity, and high speed, and to read the written records with good granularity.

[Problem that the invention seeks to solve]

The present invention was made to solve the problems of the prior art, and an object of the present invention is to create a small and light product! It is an object of the present invention to provide an optical record reading method that can perform optical aging using a light conductor laser and can be read by light irradiation with a small and light visible light emitter.

Another object of the present invention is to provide an optical record reading method that enables high-density, high-sensitivity, high-speed recording, and high-speed, high-granularity reading.

Still another object of the present invention is to provide an optical record reading method that is excellent in stability and can obtain an optically recorded image with a large amount of τ.

(Means for Solving the Problems) That is, the optical recording and reading method of the present invention provides an optical recording medium having a recording layer containing a polydiacetylene derivative compound and croconic methine.
A step of irradiating n+n infrared rays according to recorded information to discolor the irradiated part of the recording layer, and irradiating the recording layer with 500 to 750 r.
The method is characterized by comprising a step of irradiating +m visible light to read recorded information.

The polydiacetylene 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 0-formula compound) 1(-C:C-C1C-R ' (wherein 1 (and R' is a polar group; a saturated aliphatic hydrogen group such as an alkyl group or a cyclohexyl group that may be substituted with a polar group; a vinyl that may be substituted with a polar group)
^, an olefinic hydrocarbon group such as a propenyl group; or an aromatic hydrocarbon group such as a phenyl group, a naphthyl group, or an alkylphenyl group, which may be substituted with a polar group; Examples include carboxyl or its metal or amine salts, and sulfonic acids.
, (or its metal or amine salts, sulfamides)
, (, amide", ξ, amino", (, imino J, (, hydroxy group, oxyamitsuno 1L, siasonium" 1L
:, guanidine", (, hydrazine"11;, phosphoric acid"
It is obtained by combining 1ξ, silicic acid group, aluminic acid 1 (, nitrile ^, thioalcohol group, nitroJ1 (and halogen atom), and is usually used in the production of optical recording media. , is contained in an optical recording medium in the form of a crystalline compound, and prior to recording, it is combined by irradiating ultraviolet rays and used for recording.

On the other hand, the croconic methine dye used in the present invention has the following basic structure 81. ^2. ') Substitution containing 'J' aromatic ring and/or heterocycle, 1. t.

It is a compound that exhibits 4T (including 1.S) in the molecule, has an absorption peak at 800 to 900 nm, and generates heat by infrared light at this wavelength.This croconic methine Dyes typically have the following general formula [
I] to [IV] are exemplified.

General formula [I] n General formula [II] General formula [I [[] General formula [rV] Mountain Xθ In the formula, R1 and R2 are alkyl"& (for example, methyl"1 -propyl group, 1so-propyl group, n-butyl"1(,5ec-butyl", t,
. 3-hydroxypropyl group, 4-hydroxybutyl group, 2-acetoxyethyl J,
I;, carboxymethyl group, 2-carboxyethyl, 1
．． t, 3-carboxypropyl group, 2-sulfoethyl group, 3-sulfopropyl group, 4-sulfobutyl group, 3
-sulfatepropyl group, 4-sulfatebutyl group, N-(methylsulfonyl)-rubamylmethyl group,
3-(acetylsulfamyl)propyl group, 4-(
acetylsulfamyl) butyl group), cyclic alkyl group (e.g. cyclohexyl), allyl J, I
, (C)I2= (:Il-el12-), aralkyl'', ((e.g., Hensyl group, phenethyl group, α-
naphthylmethyl group, β-naphthylmethyl group, etc.), substituted aralkyl group (e.g., carboxybenzyl group, sulfobenzyl group, hydroxybenzyl group, etc.), aryl group (e.g., phenyl group, etc.) or substituted aryl group (e.g., carboxyphenyl group, etc.). group, sulfophenyl group, hydroxyphenyl group, etc.). In particular, in the present invention, among these organic residues, hydrophobic ones are preferred.

Substituted or unsubstituted heterocycles, e.g. thiazole series nuclei (e.g. thiazole, 4-methylthiazole, 4-phenylthiazole, 5-methylthiazole, 5-phenylthiazole, 4.5-dimethylthiazole, 4.5-
diphenylthiazole, 4-(2-chenyl)-thiazole), hengethiazole series nuclei (e.g. benzothiazole, 5-chlorobenzothiazole, 5-methylbenzodeazole, 6-methylbenzodeazole, 5.
6-dimethylhenzothiazole, 5-promohenzothiazole, 5-phenylhendithiazole, 5-methoxybenzothiazole, f;-methoxybenzothiazole,
5.6-Simethoxybenzothiazole 55.6-Sioxymethylenebenzothiazole, 5-hydroxybenzothiazole, 6-hydroxybenzothiazole, 4.5,
6.7-titrahydropenzothiazole, etc.), naphthothiazole series nuclei (e.g. naphtho[2,1-dl thiazole, naphtho[1,2-dl thiazole, 5-methoxynaphtho[1,2-d]thiazole, 5-ethoxynaphtho (1,2-dl thiazole, 8-methoxynaphtho [2
, 1-dlthiazole, 7-methoxynaphtho[2,1-
d] thiazole, etc.), thionafden [7,6-d]
Thiazole series nuclei (e.g. 7-medoxythionaphthene[7,8-d]thiazole), oxazole series nuclei (e.g. 7-medoxythionaphthene[7,8-d]thiazole),
For example, 1-methyloxazole, 5-methyloxazole, 4-phenyloxazole, 4,5-diphenyloxazole, 4-ethyloxazole, 4,5-dimethyloxazole, 5-phenyloxazole), benzoxazole series nuclei (e.g. benzoxazole , 5
-chlorobenzoxazole, 5-methylbenzoxazole, 5-phenylbenzoxazole, 6-methylbenzoxazole, 5,6-dimethylbenzoxazole, 5-methoxybenzoxazole, 6-methoxybenzoxazole, 5-hydroxyhenzoxazole, 6-hydroxyhenzoxazole, etc.), 1 of the naphthoxazole series (e.g. naphtho[2,1-d]
oxazole, leaft[1,2-d]oxazole, etc.), selenazole series nuclei (e.g. 4-methylselenazole, 4-phenylselenazole, etc.), benzoselenazole series nuclei (e.g. benzoselenazole, 5-chlorobenzo Selenazole, 5-methylbenzoselenazole, 5.6-dimethylbenzoselenazole, 5-methoxybenzoselenazole, 5-methyl-6-methoxybenzoselenazole, 5.6-siiximethylenebenzoselenazole, 5 -Hydroxybenzoselenazole, 4.5
．． 6,7-titrahydrohenzoselenazole, etc.), naphthoselenazole series nuclei (e.g. naphtho[2,1-d
] selenazole, naphtho[1,2-d]selenazole), thiazoline series nuclei (e.g. thiazoline, 4-methylthiazoline, 4-hydroxymethyl-4-methylthiazoline, 4,4-bis-hydroxymethylthiazoline), Oxazoline series nuclei (e.g. oxazoline),
Selenazoline series nuclei (e.g. selenazoline), 2-quinoline series nuclei (e.g. quinoline, tomethylquinoline,
1j-chloroquinoline, 6-medoxyquinoline, 6-nitoxyquinoline, 6-hydroxyquinoline), 4-quinoline series nuclei (e.g. quinoline, 6-medoxyquinoline, 7-methylquinoline, 8-methylquinoline), 1 - Nuclei of the isoquinoline series (e.g. isoquinoline, 3,4-dihydroisoquinoline), 3-isoquinoline series (e.g. isoquinoline), ] - Nuclei of the dialkylindolenine series (e.g. 3,3-dimethylindolenine, 3
．． 3-dimethyl-5-chloroindolenine: 1. :1
．． 5-trimethylindolenine, 3.3.7-trimethylindolenine), pyridine series nuclei (e.g. pyridine, 5-methylpyridine), or benzimidazole series nuclei (e.g. l-ethyl-5,6-dichlorobenzimidazole). , l-hydroxyethyl-5,6-dichlorobenzimidazole, l-ethyl-5-chlorobenzimidazole, 1-ethyl-5,6-dichlorobenzimidazole, 1-ethyl-5-phenylhencyimidazole, 1-ethyl- 5-fluorobenzimidazole, l-
Ethyl-5-cyanobenzimidazole, I-(β-acetoxyethyl)-5-cyanobenzimidazole, 1
-ethyl-5-chloro-6-cyanobenzimidazole, l-ethyl-5-fluoro-6-cyanobenzimidazole, 1-ethyl-5-acetylbenzimidazole, I-ethyl-5-carboxyhencyimidazole,
1-ethyl-5-ethoxycarbonylbenzimidazole, l-ethyl-5-sulfamylbenzimidazole, l-ethyl-5-N-ethylsulfamylhencyimidazole, 1-ethyl-5,6-difluorobenzimidazole, 1-Ethyl-5,6-dichlorobenzimidazole, 1-ethyl-5-ethylsulfonylbenzimidazole, 1-ethyl-5-methylsulfonylbenzimidazole, 1-ethyl-5-trifluoromethylbenzimidazole, 1-ethyl- 5-trifluoromethylsulfonylbenzimidazole, 1-ethyl-5-trifluoromethylsulfinylbenzimidazole, etc.)
It represents a group of nonmetallic elements essential for completing 1-. R1 and R4 are alkyl such as methyl, ethyl, propyl, butyl, etc., and do not represent L:. Further, R:l and RQ can form a ring such as morpholino, piperidinyl, pyrrolidino, etc. with the nitrogen atom. R5, Rh, R'''
and R11 is a hydrogen atom, alkyl J, Q (methyl,
ethyl, propyl, butyl), alkoxy J, ((
methoxy, ethoxy, propoxy, butoxy) or hydroxy", c. In addition, R5 and R6 can be combined to form a benzene ring, and R' and R
h, Rγ, and RO can each bond to form a benzene ring.

xe is chloride ion, dibromide ion, iodide ion, perchlorate ion, Hensensulponate ion, p
-Toluenesulfonic acid 11 ion, methyl sulfate ion, ethyl sulfate ion, propyl sulfate 1 (J1
represents an anion such as ion, ×0 represents R1 and (
or) R7 itself or the anion J1L, e.g. -5O4
♀O5蹟 , -[:0(lshishiso, Tatei+-, -So,
-Nuh〇--so, (11-so, does not exist when it contains -.

M■ does not represent a cation such as a hydrogen cation, a sodium cation, an ammonium cation, a potassium cation, or a pyridium cation. n and m are 0 or 1.

Next, typical examples of the croconic methine dye used in the present invention are listed below, but for convenience, general formula [1] or [I
n] betaine structure. However, in the preparation of these dyes, a mixture of dyes in the hetain form or salt form is obtained, so they are generally used as a mixture.

General formula Ill, (Representative example of Ill 0θ (+3) Oe (+4)
o.

(18) oe(+7)
Oe(19)
0e(20). e(
21). θ (25). e(26)
. Kuu (27)
. e +13 U U L;
H3U U Representative example of general formula [ml, [IV] (35) eO (38) e.

(37) e.

(38) eo (39) (El.

(40) θ.

The clonyrachimethine dyes (1) to (34) above are 1
IIJ can be a species or a combination of two or more species.

The optical recording medium used in the present invention contains the polydiacetylene derivative compound described above and the croconic methine dye.
The physical structure of J' of the optical recording medium may be as shown below. However, for polydiacetylene derivative compounds, polymerization + iif D
Expressed in the form of a formula compound.

(1) A recording layer constituting an optical recording medium or one containing a mixture of a D-type compound and a croconic methine dye (
one-layer mixed system).

(2) The recording layer constituting the optical recording medium consists of two layers: a layer containing a compound of formula D and a radiation absorbing layer containing a croconic methine dye (one system for two layers).

(3) A recording layer constituting an optical recording medium consisting of an alternating multi-layer structure of a layer containing a compound of formula D and a radiation absorbing layer containing a croconic methine dye (multi-layer system).

In addition, in the two-layer m system and the multi-layer system, there is a layer containing the D-type compound and a layer containing the croconic methine dye.
- The radiation absorbing layer may be laminated in any order on the surface side of the recording layer, or various protective layers may be provided on the recording layer configured in this manner depending on public funds. good.

As the substrate of the optical recording medium used in the present invention, various supporting materials such as glass, plastic plates such as acrylic resin, plastic films such as polyester, paper, and metal can be used. When recording is performed using a recording medium, one that transmits recording radiation of a specific wavelength is used.

To form a recording layer on J, t, and plate, typically D^
A fine powder of the compound and/or a croconic methine dye is dispersed or dissolved in a suitable volatile solvent to prepare a coating liquid 111, and this coating liquid or these coating liquids 1i
(A method of coating the old plate can be adopted.The coating liquid 17 includes Jl (In order to improve the adhesion between the plate and the outer layer, various types of natural or synthetic polymers may be used). In addition, various additives may be added to improve the stability and quality of the recording layer.

The solvent used for coating II7 is appropriately selected depending on the type of binder used and whether the OA compound and croconic methine dye are contained in the binder in a dispersed state or in an amorphous state. O
Suitable dispersion media for compound A include alcohols such as methanol, ethanol, and isopropanol; acetone;
Ketones such as methyl ethyl ketone and cyclohexanone;
Saturated hydrocarbons such as cyclohexane and n-hexane; aliphatic halogenated hydrocarbons such as chloroform, methylene chloride, dichloroethylene, carbon tetrachloride, and trichloroethylene; Sword: Examples include Group 6 hydrocarbons, and chloroform, Hensen, and toluene are particularly preferred. In addition, when the croconic methine dye is in an amorphous state, suitable solvents for the croconic methine dye include alcohols such as methanol, ethanol, and isopropanol; ketones such as acetone, methyl ethyl ketone, and cyclohexanone = rl; l' Amides such as f, N-dimethylformamide and N,N-dimethylacetamide; Sulfoxides such as dimethyl sulfoxide; Ethers such as detrahydrofuran, dioxane, and ethylene glycol monomethyl ether; Esters such as methyl acetate and ethyl acetate , benzene, toluene, xylene, ligroin, and other aromatic compounds, and when croconic methine is in the form of particles, dichloromethane, chloroform, carbon tetrachloride, 1.1-dichloromethane, 1.2-
Examples include halogenated hydrocarbons such as dichloromethane, 1,1,2-trichloromethane, chlorohensen, bromohensen, and 1,2-dichlorohensen.

9.411 like this? For coating the substrate at night, L methods such as spinner rotation coating method, dip coating method, spray coating method, beat coating method, wire bar coating method, blade coating method, roller coating method, and curtain coating method are used. .

If the recording layer is a mixed layer, the rough thickness is 5.
Suitable for 00 people to 2μ, especially 1000 to 500 people
A range of 0 people is preferred. The blending ratio of D^ compound and croconic methine dye in the recording layer is 1/15 to 15/
It is preferably about 1, and optimally 1/10 to 1O/1.

In addition, in the case of a two-layer separation system, the film thickness of each layer is preferably about 100 to 1,000 yen, especially 200 to 500 yen.
A range of 00 people is preferable.

In the case of a multi-layer system, the total thickness of each DA compound layer and the total thickness of the valley croconic methine dye layer are preferably about 100 to 1 μm, especially about 200 to 50 μm.
A range of 00 people is preferred.

In the optical recording/reading method of the present invention, in the optical recording medium configured as described above which is used for recording and reproduction, the D^ compound in the recording layer is first polymerized before recording is performed. That is, the D^ 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 the application of thermal energy. As a result of this polymerization, the recording layer has a 620
It has a maximum absorption wavelength at ~660 nm, ii
The color changes to a darker color. The change in hue based on this 1F combination is an irreversible change, and once the recording layer has changed to a 11+' dark color, it does not return to colorless and transparent.

In this way, the concave compound M+concave compound in the recording layer changes to a polydiacetylene derivative compound, and the recording layer becomes 1'5 to 1'5 dark in color.
used in law.

When this polydiacetylene derivative compound that has changed to a blue to dark color is heated to a temperature north of about 50°C, it changes to about 540 nm.
When the color reaches its maximum absorption level, the color changes to red. This change is also a reverse change.

The optical record reading method of the present invention utilizes the discoloration property of such a polydiacetylene derivative compound to carry out optical recording and optical record reading.
The optical recording reading method of the present invention will be explained in detail.

FIG. 1 is a schematic diagram showing an example of an optical recording/reproducing apparatus used to put into practice the optical recording/reading method of the present invention.

The above-mentioned 2i-ire production device includes an optical recording medium mounting means (not shown) for setting the optical recording medium 1 at a predetermined position;
It is also composed of four information writing means for writing information to the optical recording medium and an information reading means for reading the recorded information written on the optical recording medium. The information writing means includes a semiconductor laser 2 that emits ultraviolet rays with a wavelength within the range of 800 to 900 RAM, and controls the oscillation of the semiconductor laser 2 according to human power information; a TA control circuit 3 and an optical system (collimating lens 4, It consists of a dichroic mirror 5, a reflection plate 6, a wavelength plate 7, and an objective lens 8). As the conductor laser 2, in terms of mounting,
A bonding laser with an output wavelength of 820 to 840 nm, such as I
f1. ! It is particularly suitable to use '-1500 (trade name, newly manufactured by Hitachi Seisakusho, output wavelength 830 nm, maximum output 10 mW).

On the other hand, the information reading means is controlled by the drive circuit 9 and includes a dedicated laser or light emitting diode IO1 which emits visible light with a wavelength in the range of 550 to 750nrn.
Most of the optical system including the photodetector 12 and the optical pickup optical system connected to the output circuit I+ are shared with the optical system for the information acquisition means, but the collimating lens 13 and polarizing beam splitter 14 are unique. ).

The semiconductor laser 10 is one that emits visible light with a wavelength in the range of 650 to 750 nm, for example, a GaAl8s laser.
It is preferable to use an N-junction laser, and the light emitting diode 10 is one that emits visible light with a wavelength in the range of 550 to 750 nm, such as GaAIP, G
Preferably, junction diodes such as aP, GaAlAs, etc. are used.

The human power information is converted into an optical signal by the half-quad racer 2 via the control circuit 3. Is this Koshinso nine? 11 which is mounted on the optical recording medium mounting means through the system and rotates synchronously.
An image is formed on a predetermined position of an optical recording medium having a 4F recording layer of one color or a dark color. Image formation (position 17 is an optical recording medium or a recording layer in the case of a single-layer mixed system, and a radiation absorption layer containing croconic methine dye in the case of a two-layer separation system. Image formation point) Either the polyacetylene conducting compound present in the laser does not absorb the L/-f-beam at this wavelength, or the croconic methine dye absorbs this laser beam and generates heat. The heat generated by this croconic methine dye is transmitted to the adjacent polyacetylene derivative compound, causing the polydiacetylene derivative compound to turn red. In this way, optical writing is performed by changing the color of the recording area on the recording layer in accordance with the manual information.

On the other hand, optical record reading is carried out using low power continuous wave light emitted from a semiconductor laser or light emitting diode 10 emitting visible light with a wavelength in the range of 550-750 nm. This reading light has a low output and a wavelength outside the infrared region, so it does not cause the croconic methine dye to generate heat. Therefore, no recording is performed during reading using this reading light. The reading light forms an image on the surface of the recording layer of the optical recording medium 1 and is reflected. However, the reflectance of this reading light is different between recorded areas (discolored areas) and non-recorded areas, so this reflected light is By applying the light to the light receiving surface of the photodetector 12 through the optical pickup optical system, it is converted into an electrical signal and sent to the output circuit 1.
The recording is played back and read through the .

In the above example, the optical recording medium is a disc-shaped disk (
Although an optical disk (optical disk) 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 croconic methine dye.

〔Effect of the invention〕

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

(1) Since the recording layer contains croconic methine dye that absorbs ultraviolet rays with a wavelength in the range of 800 to 900 nm, optical writing can be performed using a small and lightweight semiconductor laser that emits ultraviolet rays in the 800 to 900 nm range. can be carried out,
It can also be read using a small and lightweight semiconductor laser or light emitting diode that emits visible light with a wavelength in the range of 550 to 750 nm.

(2) Since the recording and reproducing method utilizes changes in the hue of the recording layer due to light irradiation, high-speed, high-density, and highly sensitive optical writing can be performed, and high-speed, high-corrosion optical reading can be performed.

〔Example〕

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

Ability 6 Example 1 General 2C,, H2S-[:= c-c= C-C3H,
1 part by weight of crystalline fine powder of a diacetylene derivative compound represented by 6-COO11 and the above dye! 15 parts by weight of the croconic methine dye represented by (25) were added to 20 parts by weight of methylene chloride, and the mixture was sufficiently stirred to prepare a coating solution I5.

Next, a glass disk substrate (Jl length 1.5 mm, diameter 200 mun) was attached to a spinner coater, and the coating liquid was applied to the disk, +1 (a little!it N) at the center of the plate, and then rotated at the specified speed. Apply by rotating a spinner for a predetermined period of time, dry at room temperature, and measure the thickness of the coating film after drying on the board.
Optical recording media for 00 people, 1000 people, and 2000 people were created, respectively.

These optical recording media are uniformly exposed to 254 nm ultraviolet rays and l-
After the recording layer was irradiated for 30 minutes to polymerize the crystalline compound in the recording layer and make the recording layer a 11i color, recording was carried out under the following recording conditions according to manual instructions.

Semiconductor laser: (IILI+-1500, manufactured by Hitachi) Semiconductor laser wavelength: 8:]Onm Laser beam diameter: 1μ Laser mm crab 3mW, Laser beam irradiation time per 1 bit + 30
When the surface of the blue optical recording medium was irradiated with a laser beam for 0 ns, the irradiated area changed color to red, and recording was completed. To read the records, a conductor laser with a wavelength of 680 nm and an output of mW was used as a reading light source, and the reflected light was received by a photodetector (1) N-junction photodiode).

This record was evaluated in the following manner.

The recording density was determined by measuring the optical intensity 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 one was evaluated as ◎, and a good one was evaluated by measuring the C/N ratio. The evaluation of the recording results is shown in Table 1.

Example 2 The three types of recording media prepared in Example 1 were uniformly irradiated with ultraviolet rays of 254r++n for 1 minute to turn the recording layer into a blue film, and then recording was performed under the following recording conditions to obtain input information. .

Semiconductor laser: (IILP-7802, manufactured by Hitachi) Semiconductor laser wavelength: 800 nm Laser beam diameter = 1 laser output 3 mW, laser beam irradiation time per 1 bit: 30
The evaluation of the 0 ns recording was carried out using the same criteria as in Example 1, and the labor f value results are shown in Table 1.

Example 3, Comparative Example 1.2 Recording was carried out under the same conditions as in Example 1, except that the lasers used for recording were changed to the ones shown below.
The evaluation results are shown in Table 1.

Example 3: Semiconductor laser (Ga-As laser (W
-Heterostructure), prototype) Laser wavelength: 890r+
m Comparative Example 1: High conductor laser (Ga- daytime laser (W-
Heterostructure), prototype) Laser wavelength: 960 nm Comparative Example 2. Xenon gas laser, laser wavelength: 7
52r+m Example 4 On the same glass disk substrate as used in Example 1, first 111 parts of a croconic methine dye represented by dyestuff (25) was dissolved in 2 jQ jii parts of methylene chloride. In the same manner as in Example 1 using the coating liquid
A coating film with a thickness of 3000 mm after drying was formed. Next, 1+' of crystalline fine powder of the diacetylene conductor compound used in Example 1 [1 part of j and 1 part of nitrocellulose as a binder! [Coating 4i obtained by dispersing and dissolving the total amount in 4 parts by weight of methylene chloride was applied to a coating of croconic methine dye [in the same manner as above to obtain a coating 1 with a thickness of 3000 mm after drying].
An optical recording medium having a recording layer with a two-layer separation structure was fabricated.

After forming the recording layer of this optical recording medium into a blue film, recording and reading were carried out under the same conditions as in Example 1. The recording was evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Comparative Example 3 The same method as in Example 1 was carried out without using the croconic methine dye, but using a solution prepared by dissolving 1 part by weight of a diacetylene derivative compound and 1 part by weight of nitrocellulose in 4 parts by weight of methylene chloride as a coating solution. An optical recording medium was created. Example 1 and Comparative Example 1 for this optical recording medium
．． Recorded according to the recording conditions in 2. ) The recording and reading were carried out. The evaluation results are shown in Table 1.

Table 1 Example 5 General formula〇 17 ”?, -〇3 (knee C3 (: -C
I, ) I, I, -(:00 Instead of the diacetylene derivative compound represented by II, the general formula CIl Hl 7
A recording medium was prepared in the same manner as in Example 71b except that 0flll was used for C3C-C3f; -C, H, and -. Recording was carried out on this recording medium under the same recording conditions as in Example 1. The 11f value results are shown in Table 2.

Examples 6-9 Dyes! Instead of the croconic methine dye represented by (25), dye/L (2), (29), (37)
A recording medium was prepared in the same manner as in Example 1, except that the croconic methine dyes represented by (a2) and (a2) were used. fruitful for this recording medium b
Recording was carried out under the same recording conditions as in Example 1. The evaluation results are shown in Table 2.

Table 2

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a recording device used in the optical recording/reading method of the present invention. 1. Optical recording medium 2: R-conductor laser 3:
;III Control circuit 4: Collimating lens 5: Dichroic mirror 6 Reflector plate 7: Wave plate 8, objective lens 9 Fractional circuit lO' Semiconductor racer or light emitting diode 11 Output circuit! 2° photodetector 13 Collimating lens 14/Polarizing beam splitter

Claims (1)

[Claims] 1) In an optical recording medium having a recording layer containing a polydiacetylene derivative compound and croconic methine, 8
00 to 900 nm infrared rays according to the recorded information,
A step of discoloring the irradiated portion of the recording layer, and a step of discoloring the irradiated portion of the recording layer,
An optical record reading method comprising the step of irradiating visible light of ~750 nm to read recorded information.