JPS626447A - Optical information recording medium - Google Patents

Abstract

PURPOSE:To reduce thickness and weight by using a plastic film having 0.02-0.15 thickness for a substrate. CONSTITUTION:A recording layer 2 is provided on the substrate 1 consisting of the plastic film having 0.02-0.15mm thickness. The recording layer 2 is formed by coating the soln. contg. an org. dye on the substrate 1. An under coating layer 3 is provided for the purposes of improving the adhesiveness, acting as a barrier for water or gas, etc., improving the shelf life of the record ing layer, improving the reflectivity, protecting the substrate against solvents and forming pregrooves. The thickness and weight are thereby reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an optical information recording medium having a recording layer containing a dye.

[Prior Art] Conventionally, acrylic plates and the like have been commonly used as substrates for optical information recording media such as disks, but the acrylic plates used as these substrates are thick (1 to 2 m), heavy, and difficult to process. It has drawbacks such as high manufacturing costs, easy breakage when dropped, and troublesome handling and transportation.

[Purpose] The present invention has been made in view of the above-mentioned current situation, and its purpose is to improve the above-mentioned drawbacks observed in optical information recording media that use acrylic plates as substrates, and to provide a thin, light, and durable optical information recording medium. The purpose of the present invention is to provide an optical information recording medium.

[Structure] In the present invention, the above object has been achieved by using a plastic film having a thickness of 0.02 to 0.15 mm instead of the acrylic plate conventionally used as the substrate.

Next, the configuration of the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows the basic structure of an optical information recording medium according to the present invention. As shown in this figure, the optical information recording medium of the present invention is basically constructed by providing a recording layer 2 on a substrate 1 made of a plastic film having a thickness of 0.02 to 0.02 mm. A necessary characteristic of the plastic film constituting the substrate 1 is that it must be transparent to the radar light used only when recording and reproducing is performed from the substrate side. Examples of materials include plastic materials that can form a film of the above thickness, such as polynisdel,
Examples include cellulose acetate, polyimide, polystyrene, nylon, polyethylene, polypropylene, and polymethyl methacrylate.

The recording layer 2 is formed by coating the substrate 1 with a solution containing an organic dye.

Examples of dyes that are the main components of the recording layer include polymethine dyes (merocyanine, cyanine, etc.), anthraquinone dyes, phthalocyanine dyes, porphyrin dyes, xanthine dyes, phenanthrene dyes, triphenylmethane dyes, and biryllium. dyes, triphedziazine dyes, croconium dyes, azulene dyes, tetrahydrocholine dyes, diogisazine dyes, didiol gold 1 (Ni, Co, Mn, Cu, Pt
.

Pd)! f! dyes, aminium salt dyes, azo dyes, etc. are used.

Examples of the solvent used to prepare the coating solution include alcohols such as methanol, ethanol, and isopropanol, alcohols such as acetone, mebble ketone, and cyclohexane, N,N-dimethylformamide, Amides such as N,N-dimethylacetamide, sulfoxides such as dimethyl sulfoxide, ethers such as tetrahydrofuran, dioxane, nibrene gelicol 7-methyl needle, esters such as methyl acetate, ethyl acetate, chloroform, methylene chloride,
Aliphatic halogenated hydrocarbons such as dichloroethylene, carbon tetrachloride, and trichlorethylene, or aromatics such as benzene, toluene, xylene, ligroin, monochlorobenzene, and dichlorobenzene can be used. Application is dip coating, spray coating, blade coating, spin coating,
This can be done using conventional coating methods such as roller coating. The thickness of the recording layer is 100 to 1
0 μm, preferably 200 to 2 μm.

Further, as shown in FIG. 2, the optical information recording medium of the present invention can have a structure in which an undercoat layer 3 is provided between the substrate 1 and the recording layer 2.

The subbing layer (a) improves adhesion, (b) serves as a barrier against water or gas, (C) improves storage stability of the recording layer, and (d)
improvement of reflectance, (e) protection of the substrate from solvents and (f
) Provided for the purpose of forming a pre-groove, etc. (
For the purpose of a), various materials such as polymeric materials such as ionomer resins, polyamide resins, vinyl resins, natural polymers, silicones, and liquid rubbers, or various substances such as silane coupling agents can be used. I can do it (
b).

For the purpose of (C), inorganic compounds such as Si 02 , M(l F2 , Si 0°1
i 02 , ZnO, TiN, SiN, etc., metals or metalloids such as ln, Cu, S, Ni, Cr.

Ge, Se, Cd, Aa, AM, etc. can be used. For purposes of (d), metals such as metals.

For example, methine dyes, xanthine dyes, etc. can be used, and for the purpose of (0), ([), UV curing resins, thermosetting resins, thermoplastic Resin etc. can be used.

Note that the film η of the undercoat layer is suitably 200 to 20 μm.

Further, as shown in FIGS. 3 and 4, a protective layer 4 may be provided on the recording layer 2. The protective layer 4 is provided for the purpose of protecting the recording layer 2 from scratches, dust, dirt, etc. and improving the storage stability and reflectance of the recording, and is made of the same material as the undercoat layer. can be used. The thickness of the protective layer is 1000~
300 μm is appropriate.

Further, the undercoat layer or the protective layer may contain stabilizers, dispersants, flame retardants, lubricants, antistatic agents, surfactants, r1 plasticizers, and the like.

Roughly speaking, as another structure of the optical information recording medium according to the present invention, two recording media having the same structure as shown in FIGS. 2 is placed inside and sealed, as shown in FIG.
It is also possible to use a thin air sand inch structure, or a so-called dense W as shown in FIG.
, a two-strand arch structure (bonded 11i structure) may be used.

Note that in order to efficiently read and reproduce the optical information recording medium, it is preferable that a guide groove (pre-groove) be provided.

When the optical information recording medium of the present invention is used for recording and reproducing information, the information is recorded by a physical shape change (bit formation) caused by the interaction between the recording layer and its light or heat by irradiation with radar light for penetrating. recorded by. On the other hand, information is reproduced by sensing the reflectance of the recording layer by irradiating it with a reading laser beam.

According to the present invention, by using a plastic snack film instead of a thick (about 1 or 2 m) and heavy acrylic board, the thickness can be reduced to 1/10 or less, and the weight can also be reduced. be able to. Therefore, it is convenient to handle and carry, and has the advantage that it can be sent in an envelope or the like, and will not be damaged even if it is dropped. In addition, conventional acrylic plates require grinding such as cutting the outer periphery, but film can be manufactured continuously with cutting, punching, and handling capabilities, improving productivity. Additionally, the film is thin, making it easier to process and saving motor energy.

[Example] Example 1 A polyester film with a thickness of 50 μm was used as a substrate, a dotting layer made of a photocurable resin was provided on the substrate, and a pregroove was formed on this. A dye-based recording material was coated on this. After that, the polyester film was used as a spacer and combined with another polyester film facing each other, and the outer and inner peripheries were cut to produce an optical information recording medium having a diameter of 9 r:tx.

The tllNm of this recording medium is 2g, which is 1
Compared to a recording medium of the same diameter using an acrylic plate of 111, this corresponds to a weight ω of 1715.

By applying the present invention to miniaturization, it is also possible to create a recording medium that can be carried by an individual and stored in each group. Furthermore, as recording media become smaller, devices can also be made smaller, and such devices can be used to read and write data anywhere.

Example 2 A dye recording material was formed on a polyvarnish film having a thickness of 200 μm in the same manner as in Example 1, and a silicone resin dissolved in toluene was coated to a thickness of about 20 μm as a protective layer. A recording medium having the structure shown in the figure was obtained.

The weight was approximately 6g.

[Effects] The optical information recording medium according to the present invention has the following advantages compared to a medium whose binding plate is an acrylic plate.

1) Thickness is 'R< (0,02□-0,15s+),
Light weight.

2) It is convenient to handle and carry.

3) Will not be damaged when dropped.

4) The manufacturing cost is low.

5) Easy to process.

6) High productivity.

7) The energy required for the motor can be saved.

[Brief explanation of the drawing]

1 to 4 are schematic diagrams showing the structure of an optical information recording medium according to the present invention, and FIGS. 5 and 6 are diagrams showing the structure of an optical information recording medium having a sandwich-inch structure etc. by applying the present invention. FIG. 1...Substrate 2...Recording layer 3...
Undercoat layer 4...Protective layer 5...Spacer Patent applicant: Ritsu Gaidoru Co., Ltd. Figure 5 Figure 6

Claims (1)

[Claims] In an optical information recording medium in which a recording layer containing a dye is provided directly or via an undercoat layer on a substrate, and a protective layer is further provided thereon as necessary, the substrate has a thickness of 0.02 mm.
An optical information recording medium characterized by using a plastic film of ~0.15 mm.