JPS58119896A - Optical information recording material - Google Patents

Abstract

PURPOSE:To obtain an optical information recording material having a high reflectivity and a high laser absorbability for use in laser writing, by adding a xanthene dye to a thin-film dyestuff layer with a bronze luster. CONSTITUTION:A xanthene dye (e.g., Erythrocin 426, rhodamine B or eosin) is dissolved in a solvent (e.g., water or methanol) and the solution is applied on a substrate (e.g., that of PVC or acrylic resin) by a spray or roller coating, or dipping, etc., to form a thin-film dyestuff layer with a bronze luster and thereby obtain an objective recording material.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information arrangement member having an organic dye thin film layer.

In the past, a number of laser-written round optical recording media have been developed. Typical examples include recording media with metal, semimetal, and nonmetal smoked films, and K11L.
There is a clouding medium in which a reflective film is formed by heating a dry plate. However, the deposition of metals, metalloids and non-metals 1 [
K-based recording media are generally manufactured by vacuum forming in a patch system rather than a continuous system, making them expensive and requiring a large number of patches to ensure uniformity of quality for mass production of the product. difficult to achieve. Further, since the method uses a method coating method in which a reflective film is formed by heating a silver dry plate, the equipment is easy to use, but there is a problem in that the silver particle dispersion system has a 098A ratio.

In addition, so-called r with the ability to "read directly after writing"
DRAW (lr@at r@ad after w
rita) J media has (1) a high rounding reflectance that requires ±1μ focus control during recording and (2)
) A material with strong absorption for the laser used was required, and therefore metal was used as a material that met this material. However, the above-mentioned problems inherent in the use of metals.

Therefore, the present inventor has conducted extensive research into the above-mentioned interpolation point, and as a result, developed a recording member that satisfies the conditions (1) and (2) above by using xanthene dye as an O material other than metal. This led to the completion of the present invention. That is, the present invention is based on the knowledge that when a solution of the above dye is applied onto a substrate and dried, the dye gives a bronze luster on the substrate and exhibits a large reflectance in the vicinity of absorption of the dye.

The optical information recorder of the present invention is characterized in that a xanthine dye is used in the dye thin film layer having bronze luster.

The optical information recording member of the present invention has a dye thin film layer with a bronze luster on a basic Ka substrate, but above and below the dark red dye thin film layer, for example, a protective layer or the like can be formed, depending on the purpose. Other layers can be provided. Here "bronze luster"
is the metal-like reflection that a pigment exhibits in a specific light wavelength range.Actually, GoSO with a reflectance of 20 or more is suitable, and GoSO is preferable.Pson's gloss is the reflection of metal. Although it has a different and unique coloration, it can have a high reflectance for the wavelength of the laser light for recording and reproduction, so it can increase the amount of light that continuously outputs information, and the S of the continuous signal.
/N can be improved.

The substrate materials used in the present invention are known to those skilled in the art and can be either transparent or opaque to the laser light used. However, when writing and recording with a laser beam from the substrate side, it must be transparent to the writing laser beam.On the other hand, when writing and recording from the side opposite to the substrate, that is, the surface of the recording layer, the writing laser beam must be transparent. It doesn't have to be transparent. However, when reading and reproducing is performed using transmitted light, it must be transparent to the reading laser beam, and when reading and reproducing is performed using reflected light, it may be either transparent or opaque to the reading laser beam. Substrate materials include glass, quartz, ceramics, plastics, and paper.

It may be a support for commonly used recording materials such as plate or foil metal. In particular, plastics are safe,
Improved recording sensitivity, long-lasting performance, and lightweight.

This is suitable from the viewpoint of processability. Typical plastics include vinyl chloride resin, vinyl acetate resin, acrylic resin, methacrylic resin, polyester resin, nitrocell, ethylene resin, polypropylene resin, boria resin, polystyrene resin, polycarbonate resin, and epoxy resin. etc.

The xanthine dye in the present invention refers to a dye having a quinanthene skeleton, and typical examples include those having the structure of eosin and erythrosine. Specifically, the diagnosis is made by selecting any haze known as a sensitizing dye for various recording materials (for example, a sensitizer for zinc oxide recording paper). Examples include erythrosin 426 (CI45
430), Rhodamine B (CI 45100), Eosin (CI 45580), Furonakasin (CX 4541)
0), Rose Bengal (CI 45400), -1Dan6acp (CI451tSO), Rhodamine BH (c
r 45170), CI 45305, Cl45180
and so on.

Generally, the dye thin film layer with bronze luster in the present invention can be formed by providing a solution of a xanthine dye dissolved in an organic solvent on a substrate. Examples of organic solvents that can be used include water, methanol, and methylene dichloride. Application is carried out by conventional coating methods such as spraying, roller coating, dipping and spinning.

The laser beam applied to the optical information recording member of the present invention must be selected depending on the absorption wavelength of the dye. Therefore, depending on each dye, 12, He-04%Ar, He-N
e, A/B, dye, semiconductor laser power selected.

Next, examples will be given to specifically explain the present invention, but the present invention is not limited thereto.

Examples 1 to 4 The xanthine dye α2f listed in the table below was dissolved in water or methanol (10-10°C), filtered through a 11 μm membrane filter, and placed on a blue plate glass substrate by dipping method (dipping speed: 1.3e). */sec) K was coated with the film thickness shown in the table and dried with an infrared lamp to produce an optical information recording member.

A 1QmW He-)ie laser was applied to the thus obtained recording sickle member as a carrier signal of α5MH3g at 1.6pmKj.
Recording was performed by irradiating JJK light, and the reproduced signal was measured with a spectrum analyzer.The S/N ratio of each member was found to be good under the condition of a scanning filter band width of 30 KHz. Furthermore, when observed with a mirror with holes in the exposed area, holes of approximately 1 μm in size were observed in each member.

Cap Xanthine dye drug
All of the thin films of the information recording members mentioned above have a bronze luster and have a bronze luster of 550 nm.
It has strong absorption around 600 n121 and a high reflectance exceeding 30- around 600 n121.

The accompanying drawings show the transmission and reflection vectors of the recording member according to Example IK.

[Brief explanation of the drawing]

The attached drawing is a diagram showing the reflectance (dotted line) and transmittance (solid line) of the recording member O according to Example 1. Patent applicant Ricoh Co., Ltd. Wavelength (1'lT)
L)

Claims (1)

[Claims] An optical information recording member comprising a substrate and a dye thin film layer made of a xanthine dye and having a bronze luster.