JPS60213938A - Light recording medium - Google Patents

Abstract

PURPOSE:To enable recording even by using low power by forming on a support a resin material contg. one of tocopherols, a colorless dye, and a resin for dispersing them. CONSTITUTION:The resin material 3 formed on the support 2 contains tocopherol or its derivs. 7, a colorless dye 6, preferably, such as benzoyl-leuco- methylene blue, and the resin for dispersing them, such as PMMA, and such a compsn. is dissolved in a solvent, such as acetone, and applied to the support 2, such as a glass disc, to obtain a light recording medium. Such a recording medium is irradiated with UV rays 4 to execute recording. The written record can be read out by transmitting light corresponding in wavelength to said rays 4 through the medium. Information can be recorded even with low power by using the light absorbing film of said resin material 3 of such a structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recording medium used in, for example, an original disk recording and reproducing apparatus.

[Prior Art] Conventionally, disc-shaped recording media (hereinafter referred to as discs) used in optical disc devices have been used as master discs used for large-scale duplication for playback-only video discs and PCM audio discs. There are two types of disks: disks with a recording medium adhered to the surface of a substrate such as glass or plastic, which are used in devices with a recording function. The disk to which this invention is applied is a disk used in a device with a recording function. Figure 1 is a schematic diagram of a conventional device for writing information into a disk.
1) is a disk, (2) is a support, (3) is a light absorption layer,
t4) is a laser beam, and (5) is an objective lens. As shown in the figure, this disk (1) is typically mounted on a support such as glass and plastic, typically about one inch thick.
2) For example, a metal vapor deposited film such as tellurium is formed on the surface of 1.
Original absorption layer (31).

An optical disc recording/reproducing device is a device that records and reproduces information using laser light, but in a device equipped with a recording function, the laser light (4) is transmitted through a light absorption layer while rotating the disc (1) t”. By focusing the laser beam on the surface of a certain metal vapor deposited film (3) with an objective lens (5) and modulating the laser beam with the information to be written, information is written in the form of a hole made in the metal vapor deposited film (3) by thermal processing. Such a light absorbing layer has favorable characteristics such as a good coverage ratio of a metal vapor deposited film such as tellurium, and less loss of information called dropout, and is especially suitable for a conductor with low thermal resistance. K for recording with a laser with a power of 1 is often used.For example, a metal with a low melting point such as tellurium is often used.However, in the conventional TIF in which a low melting point metal such as tellurium is vapor-deposited as a light absorption layer, a metal such as tellurium is used. Easily oxidized, progress of oxidation VC#
The drawback was that the original reflectance decreased, and the recording sensitivity gradually deteriorated.

[Summary of the invention]

This invention was made to eliminate the drawbacks of the above-mentioned conventional methods, and includes dispersion of at least one of tocopherol and its derivatives, a colorless dye, and a dispersion of these colorless dyes and at least one of tocopherol and its (D derivative). It is an object of the present invention to provide an optical recording medium that can be recorded even with low power by using a support material provided with a resin material containing a resin that makes it possible to perform recording.

[Embodiments of the invention]

Figure A2 shows information on the optical recording medium according to the embodiment of this invention @
FIG. 3 is a schematic diagram of a writing device. In fig.

(1) to (5) are the same as in FIG. 1, (6) is a colorless dye, and (7) is at least one of tocopherol and its derivatives.

Tocopherol and its derivatives according to the present invention include α-tocopherol, β-tocopherol, r-)
Copherol, δ-tocopherol, 5.7-dimethyltocopherol, 7-meth-rutocopherol, 5-meth-rutocopherol.

Tocolua α-tocotrienol, β-)cotrienol, γ-tocotrienol, δ-tocotrienol, tocotrienol, α-tocopherol acetate, d-α-tocopherol succinate, tocopheramine, α-
Tocopherothiol.

α-tocopherothioffi[sα-toco7a disulfide dimer, α-tocopheroselenacetic acid and diα-
There are tocopherodiselenides, etc. The structure of α-tocopherol is shown below as an example of a chemical structural formula.

Colorless dyes according to this invention include benzoyl leucomethylene blue, leucomalachite green, crystal violet lactone, and rhodamine B lactam.

The resins used in this invention include polymethyl methacrylate (PMMA) and polyethyl methacrylate.

Examples include polystyrene and polyvinyl chloride.

Supports related to this invention include glass, quartz plates, plastics, and the like.

Further, when recording is performed using the optical recording medium of the present invention, the optical recording medium of the present invention is irradiated with ultraviolet light.

This is done by coloring the colorless dye in the optical recording medium. Next, this recording is read out by transmitting, for example, light having a wavelength corresponding to the colored light. Furthermore, if the support is highly reflective, recorded information can be read out even with one reflected light.

The present invention will be explained below with reference to Examples, but is not limited thereto.

Example 1 1 part by weight of α-tocopherol, 1 part by weight of colorless dye benzoylleucomethylene blue and PMMA 8-needle part ff
192] Bathed in f-wave acetone. This thing has a diameter of 3
A cordon was placed on a 0 cIn glass disk using a Whaler to a final thickness of 10 μm and dried at room temperature to obtain an optical recording medium. This material was exposed to ultraviolet light (2 m
A light intensity of W) was narrowed down to a 10 μm spot, and the light absorption film was irradiated for 200 με and recorded. Next, a device for reading out the information recorded in the optical recording medium according to the embodiment of the present invention as shown in FIG. 3 was used to irradiate light of 650 nm.

The change in transmitted light was measured. In the figure, (l) to i
7) Same as 11-1 Figure 2, (8) is the light source, (9)
is a monochromator, and Ql is a photodetector. As a result, the entire contrast ratio is defined by a linear equation, where the absorbance of the portion exposed to ultraviolet light is Rlm and the absorbance of the portion not exposed is R2.

As a result, the contrast ratio was OA.

Example 2 α-tocopherol acetate 1.5 parts.

0.5 N parts of the colorless dye Rhodamine B-lactam and 8 parts of polyethyl methacrylate are dissolved in 92 g of methyl ether ketone. This material was spin-coated onto a glass disk having a diameter of 30 degrees to a final thickness of 20 μm, and dry-recorded at room temperature to obtain an optical recording medium. This one has a second
Ultraviolet light by the device shown in the figure? It was irradiated for 1-10θμS and recorded. Next, as in the example, light of &C540 nm was irradiated, and the change in transmitted light was measured, and the contrast ratio was 0.5.

From the contrast ratio values of the above examples, it was found that recording using the optical recording medium of the present invention can be distinguished and used.

〔Effect of the invention〕

As explained above, the present invention is directed to a resin material containing a resin containing at least a small amount of tocopherol and its derivatives, a colorless dye, and a resin in which these colorless dyes and at least one of tocopherol and its derivatives are dispersed. By using an optical recording medium provided on a support, it is possible to obtain an optical recording medium that can be recorded even with low power.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a conventional device for writing information onto a disk, Fig. 2 is a schematic diagram of a device for writing information to an optical recording medium according to an embodiment of the present invention, and Fig. 3 is a schematic diagram of a device for writing information to an optical recording medium according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an apparatus for reading information written on an optical recording medium according to an example. In the figure, (1) is a disk, (2) is a support, (3
I is a light absorption film, (4) is a laser beam, (5) is an objective lens, (6) is a colorless dye, (7) is at least one of tocopherol and its derivatives, (8) is a light source, (9
) is a monochromator, (11 is a photodetector. The same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa No. iE Figure 2 Figure 3 Procedure amendment (self-motivated) 1972 September 13, 2013, Dear Commissioner of the Japan Patent Office, 1. Indication of the case: Japanese Patent Application No. 59-071296 2. Name of the invention: Optical recording medium 3. Person making the amendment: 5. Detailed description of the invention in the specification to be amended. Column 1” ■ Examination 6, Contents of Amendment 8 “Tocopherol” in lines 9 and 10 of page 4 of the specification is corrected to “Tocol J.”

Claims (1)

[Claims] (1) A resinous material containing tocopherol and at least one of its cast conductor, a colorless dye, and a resin in which these colorless dyes, tocopherol, and at least one of its poisonous substance are dispersed is provided on a support. optical recording medium. (21) The optical recording medium according to claim 1, wherein the colorless dye is benzoylleucomethylene blue.