JPS5883344A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To improve not only recording sensitivity, but also contrast by supporting a phenalene derivative compound on a substrate as an information recording layer, and storing information by a laser beam. CONSTITUTION:On one surface of a glass substrate, an optical information recording medium having a 5,000Angstrom film thickness is formed by dipping the substrate in an ethyl alcohol solution of phenalene derivative compound and then drying the surface. In this case, a protective film made of a polyester, etc., may be formed on the surface of the information recording layer. Further, a reflective film of Al may be formed between the substrate and information recording layer. This information recording thin film surface is irradiated with an He-Ne laser beam having a 2.4mum diameter and information is recorded while being moved. At this time, the recording sensitivity is 5nJ/bit.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical recording medium having a phenalene derivative compound layer as an information recording layer.

Hitherto, this type of optical information medium has been known to have one type of configuration. For example, Japanese Patent Application Laid-Open No. 55-97055 discloses one in which a single layer of a 7-talocyanine compound is provided on a substrate. ing.

Furthermore, organic dyes generally have a lower reflectance and a relatively lower melting point than inorganic compounds such as metals. However, on the other hand, there are some materials whose absorption rate reaches a maximum at a specific O wavelength. Therefore, a two-layer structure has been proposed to solve these drawbacks. That is, materials with high reflectance such as Muj%5g%Pb, Ou%Ha,
In this embodiment, a metal thin film such as Or is provided between the recording layer and the substrate or on the recording layer. However, although the contrast is improved by such means, there is a drawback that a high reflectance layer is required compared to the case of only four recording layers, and the manufacturing process is expensive. Contaminants such as dirt and dust can also get mixed into the product (manufacturing yields are affected due to quality control). Furthermore, there is a drawback that reliability deteriorates due to deterioration of optical characteristics due to oxidation of the high reflectance layer in the air. Furthermore, those in which the recording layer between the substrate and the high reflectance layer has a sandwich structure have the disadvantage that recording is not performed sufficiently due to scattering of laser light, resulting in a decrease in recording sensitivity. are doing.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a device having a single-layer structure in which a heptagonalene derivative compound layer is supported on a substrate, and which can easily perform recording and reproducing without causing a state change with a high-density energy beam such as a laser beam. It is a company that provides optical recording media.

Compounds useful for optical recording media in the present invention are represented by the following general formula.

X 4 tons or 0 pieces 4) [Summer-methyl-benzthiazolyl-(2)-ikenno]-
7 enalaeum tetrafluoroborate, 1-ethoxy-3-[summer-ethylupensthiazolinylidene-(2
)-Methyl]-7enaleniumtetrafluoroborate, 1-pyrrolidino-3-(summer-ethylbenzthiazolinylidene-(2)-methyl)-7enaleniumtetrafluoroporate, 1,3-bis-[3 -Ethylbenzthiazolinylidene-(2)-methyl]-7enalenium tetrafluoroborate and the like can be mentioned.

These compounds have absorption in the wavelength band of 600=EjOOnm and have absorption coefficients of 104 to 1o5a11''
It is a 10-value compound. Furthermore, it shows a melting point in the range of 200 to 400°C.

In the present invention, the general synthesis and properties, particularly the absorption spectra, of the heptagonalene derivative compound supported on the substrate Km are described in (2) SBI furnace, oham, etc.
, J Vol. 732, pp. 7-25 (1970).

The structure of the present invention will be described in detail below. Examples of the structure of the present invention are shown in the accompanying drawings 1 to 4. FIG. The case without the layer and FIG. 2 the case with the protective layer 3. The presence of a protective layer is not essential but desirable. FIG. 3 shows a case where a metal 4 having a high reflectance is sandwiched between the company information recording layer 2 and the substrate 1. The presence of metals with high reflectance is essential, and in some cases desirable. High reflectance metals are typically
Examples include %mu-inclusive. Particularly preferred is M. Figure 4 is an addition to the example in Figure 6.

Furthermore, if there is a protective layer 3, the presence of such a protective layer O is not essential but desirable.

The substrate material used in constructing the present invention may be transparent or opaque to the laser beam used. However, when writing and imaging is performed with the laser beam from the substrate side, the writing laser beam must be transparent. When writing imaging is performed from the side opposite to the substrate, it is not necessary to be transparent to the writing laser beam. However, when read and reproduced using transmitted light, the support must be transparent to the readout laser beam, and the material may be glass, plastic paper, or a support made of general recording materials such as a sheet of metal with a foil on the front. Plastics are particularly preferred from the viewpoints of safety, improved imaging sensitivity, and flatness. Typical plastics include vinyl chloride resin and vinyl acetate resin.
, acrylic resin, methacrylic resin, polyester resin,
Examples include Rocellulo-4,/13 ethylene resin, polypropylene resin, polyamide resin, polystyrene resin, polycarbonate resin, and epoxy resin.

When using a hexafluoride conductor compound as an information recording layer in an optical information recording medium, the film thickness is 100X to 5μ.
m, preferably 1aaai to 5ttn, and the film can be formed by a commonly used thin film forming method such as a vacuum evaporation method, a sputtering method, a doctor blade method, a casting method, a spinner method, or a dipping method. can. In particular, the spinner method and dipping method are excellent. Further, it can be mixed with a binder to form a film if necessary.

The presence of a protective layer is not essential, but it may be used if necessary. If used, it must be transparent to laser light and
Any inorganic material may be used as long as it has a high mechanical strength and does not react with the recording layer and has good film properties. Mg
O, ZnO1Mgy2.0uF2 etc.0m
Thickness is 5o~5oooX preferably 100~zoooff
The film forming method may be a commonly used thin film forming method such as a vacuum evaporation method, a sputtering method, an ion plate method, an ion cluster method, or a glow discharge method. Particularly preferable organic materials are film forming properties and processability. It is an organic polymer compound due to its properties. For example, polystyrene, polyester, polycarbonate, polyxylene, polyvinyl chloride,
Homopolymers and copolymers of polyacrylonitrile, polymethacrynitrile, polyacrylic esters, polyacrylic esters, polyvinyl acetate, polyethylene, polyethylene, polyepoxy, boria, polyurea, polysulfone, phenolic resins, etc. can be given.

The thickness is 11 to 5 μm, preferably 115 to 2 μm, and the film forming method may be any commonly used thin film forming method such as vacuum evaporation, sputtering, vapor growth, glow discharge, or solvent coating.

Laser beams used for the optical information recording medium of the present invention include N2, He-01, mur%: He-1Ne, ruby, semiconductor, and dye lasers. In terms of ease and compactness,
Semiconductor lasers are preferred.

Example 1 A glass plate with a thickness of 1 m was immersed in an ethyl alcohol solution of 1,3-bis-[K-methyl-benzthiazolyl-(2)-imino]-7enalenicumtet 2-fluoroborate, and then dried to reduce the film thickness. was set to 5000X. This recording medium was irradiated with a He-Ne laser from the thin film surface with a beam diameter of 2.4 Itm and an irradiation nozzle of 5 mW on the irradiation surface. As a result of recording while moving the recording medium at 910 μm/sec, the placement sensitivity was 5n, T/bit.

Example 2 A glass plate with a thickness of 1 cm was immersed in an acetonitrile solution of 1-ethoxy-3-[N-ethylbenzthiazolinylidene-(2)-methyl]-phenalaeum tetrafluoroborate, and then dried. And the film thickness is 50oo! And so.

A He-Ne laser was applied to this recording medium using a thin film surface at 2.4 mm.
Irradiation was performed with a beam diameter of μm and an irradiation power of 5 mW on the irradiation surface. As a result of recording while moving the recording medium at a rate of 910 μm for 1 sec, the placement sensitivity was 1 nJ/bit.

Example 3 A glass plate having a thickness of Lm was coated with 1-pyrrolidino-3-(N-ethylupenzthiazolinylidene(-methyl)-7).
The film was immersed in an acetonitrile solution of enalenium tetrafluoroborate and then dried to a film thickness of 50,001 mm. A He-N laser is applied to this recording medium from the thin film surface.
．． Irradiation power on the irradiation surface is 5mW with a beam diameter of 4μ bow
and irradiated it. As a result of recording while moving the recording medium at 910 μm/sec, the recording sensitivity was α7 ny
/Bit de Atsuku.

Example 4 A glass plate with a thickness of 1 m was immersed in a 1,3-bis-[3-ethylbenzthiazolinylidene-(2)-methyl]-7enaleniumtetrafluoroboré)O nitromethane solution and then dried. The film thickness was set to 5ooooX. This recording medium was irradiated from the thin film surface with a semiconductor laser of 820 nm (manufactured by Yokocho Denryoku) with an A pulse width of 1 μm and a C% irradiation power of 4 mW and a beam diameter of 16 μm on the thin film surface. 9 recording media
As a result of recording while moving at 10 agony/8・C,
Recording sensitivity is Fit5nJA'.

[Brief explanation of the drawing]

In the accompanying drawings, FIG. 1 shows the optical information recording medium of the present invention, FIG. 2 shows the optical information recording medium of the present invention with a protective layer, and FIG. 3 shows the optical information recording medium of the present invention. FIG. 4 shows a case where the medium device has a sandwich structure made of a metal having a high reflectance, and FIG. 4 shows a case where the sandwich structure shown in FIG. 6 has a protective layer in the optical information device medium of the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Information recording layer, 3... Protective layer,
4...Metal with high reflectance.

Claims (1)

[Claims] It is characterized in that the substrate supports a 7-nare/ll conductor compound. An optical information medium for recording and reproducing (Jin and K) whose state changes are caused by laser beams.