JPH0227540A - Method for manufacturing information recording media - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing an information recording medium, and particularly to a method of manufacturing an information recording medium on which a preformat is formed.

[Prior Art] Conventionally, as a method for forming a preformat on a substrate for an information recording medium, when the substrate is made of thermoplastic resin, a method such as injection molding at a temperature higher than the melting point or a method such as hot press molding is used. Alternatively, after applying a photocurable resin composition onto the substrate, using a stanbar mold.
A known method is to photo-transfer a stubber mold by bringing the molds into close contact with each other and curing the photocurable resin composition by irradiating it with ultraviolet rays or the like.

FIG. 3 is a schematic cross-sectional view showing a conventional information recording medium. In the figure, a conventional information recording medium has a recording layer 1 on a resin base material 12 provided with a track portion 13 having an uneven shape.
1, and a base material 1 which also serves as a protective layer on the recording layer 11.
5 are bonded together via an adhesive layer 14.

[Problems to be Solved by the Invention] As described above, conventional information recording media have a structure in which a recording layer is formed on a resin substrate having track portions having an uneven shape. In the case of manufacturing, first, an uneven shape must be formed on the resin base layer.

In this case, problems such as transfer yield, transfer time, durability and cost of the stubber type make mass production difficult and increase the price.

The present invention has been made to improve the drawbacks of the prior art, and simplifies the manufacturing process by forming a preformat on a dye recording layer made of an organic dye medium formed on a substrate. The purpose of the present invention is to provide a method for manufacturing an information recording medium that can increase productivity and improve productivity.

[Means for Solving the Problems] That is, the present invention provides a method for applying an ozone treatment to a substrate surface patterned with a material whose tendency to modify the dye recording layer by ozone treatment is different from that of the substrate, and then forming a dye recording layer on the substrate surface. This is a method of manufacturing an information recording medium, the method comprising: forming an information recording medium.

The present invention will be explained in detail below.

The method for manufacturing an information recording medium of the present invention includes forming a preformat pattern on the surface of a substrate using a material whose dye recording layer has a tendency to be modified by ozone treatment that is different from that of the substrate, and then forming a preformat pattern on the substrate surface on which the preformat pattern is formed. is treated with ozone, then a dye recording layer made of an organic dye-based medium is formed on the substrate, and the organic dye in the dye recording layer that is in contact with the ozone-treated portion of the substrate is altered, thereby forming the dye recording layer. It is formed by forming a preformat on the layer.

Next, the present invention will be explained based on the drawings.

FIGS. 1(a) to 1(c) are process diagrams showing an example of the method for manufacturing the information recording medium of the present invention. First, in FIG. 1(a), a resist 3 made of a material such as a photosensitive resin whose tendency to modify the dye recording layer by ozone treatment is different from that of the substrate is placed on the substrate 2.
Forms a thin film.

Next, in FIG. 1(b), the thin film of the photosensitive resin resist 3 formed in FIG. 1(a) is irradiated with light 6 of a wavelength to which the thin film of the photosensitive resin is sensitive through the photomask 5. Then, the exposed resist 3
By developing the resist 3a, the portion irradiated with the light 6 remains as a patterned resist 3a, and the portion not irradiated with the light 6 is removed.

Thereafter, in FIG. 1(C), when ozone treatment is applied to the surface of the substrate on which the patterned resist 3a formed as described above is formed, it conforms to the shape of the pre-7-ohm pattern of the substrate 2. Part of the ozone treatment section 2a is subjected to ozone treatment.

Next, a dye recording layer 1 is formed by applying a solution of an organic dye dissolved in a solvent onto the substrate 2 which has been subjected to the ozone treatment as described above. la indicates an altered portion of the dye recording layer 1, and the organic dye in the portion of the dye recording layer 1 that is in contact with the ozone-treated portion 2a reacts with the ozone-treated substrate surface to alter its quality and form an altered portion 1a. Since the reflectance of the degraded portion 1a of the dye recording layer 1 decreases, it is possible to read preliminary information such as the AT servo and recording start position by using the low reflectance portion as a preformat.

FIG. 2(a) is an explanatory diagram showing an information recording medium that has been ozone treated by the above method, FIG. 2(b) is a partially enlarged view thereof, and 7 is a substrate treatment portion where the substrate has been subjected to ozone treatment. When the dye recording layer l is formed on the substrate 2 after ozone treatment, patterned recording tracks 1' and guide tracks la' are formed in the substrate treated area 7. In the present invention, the dye recording layer As for preformatting itself, for example, a reduction in the reflectance of an organic dye-based medium when an acrylic resin substrate is used can be used.

In the present invention, the substrate 2 is made of a material that can be subjected to ozone treatment, such as a plastic plate made of polycarbonate resin, epoxy resin, polymethylpentene resin, acrylic resin, styrene-epoxy copolymer, etc. can be used. Preferably, the substrate is an optically transparent material.

As a specific method for performing ozone treatment, a commercially available ozone treatment device may be used, or ozone generated due to UV irradiation may be used.

In addition, examples of materials whose modification tendency of the dye recording layer by ozone treatment is different from that of the substrate include poly(methyl methacrylate) and poly(methyl isobrobenyl ketone) (0DUR-1100 series manufactured by Tokyo Ohka Kogyo ■), phenolic resin and aromatic azide (0DO manufactured by Tokyo Ohka Kogyo)
Examples include resists such as R-120 and RD-200ON (manufactured by Hitachi Chemical). The resist may be of the same type as the substrate, as long as the dye recording layer has a different tendency to be modified by ozone treatment than the substrate. For example, if polymethyl methacrylate is used for the substrate, the resist may Poly(methyl methacrylate) modified to have a lower molecular weight than the polymethyl methacrylate of the substrate and to be easily sensitive to ultraviolet light can be used.

Examples of organic dyes forming the dye recording layer l include cyanine dyes, polymethine dyes, phthalocyanine dyes, merocyanine dyes, azulene dyes, and squalium dyes, among which the following structural formula Cyanine dyes shown in (I) and polymethine dyes shown in structural formulas (II) and (m) are preferred as they have practical properties, and polymethine dyes are preferred as solvent-soluble dyes that are suitable for printing. Dye is superior in terms of productivity and cost.

Structural formula (I) Structural formula (■) cpo,.

Structural formula (Iff) CI2Si0 The thickness of the dye recording layer is usually 500 to 2000, preferably 800 to 1200.

As described above, in the method for manufacturing an information recording medium of the present invention, the surface of the substrate is patterned with a material whose tendency to modify the dye recording layer by ozone treatment is different from that of the substrate, and then the surface of the substrate is It can be easily manufactured by forming a dye recording layer on the dye recording layer, forming a preformat on the dye recording layer, and then adhering a base material that also serves as a protective layer onto the dye recording layer via an adhesive layer.

Examples of the adhesive layer include hot melt type ethylene-vinyl acetate copolymers and modified resins thereof, ethylene-ethyl acrylate copolymers, vinyl acetate-acrylate copolymers, polyimide resins, epoxy resins, and the like.

The base material can be made of any material such as glass, plastic, metal, etc., but it is preferably made of the same material as the substrate.

[Function] The method for manufacturing an information recording medium of the present invention includes ozone-treating the surface of a substrate patterned with a material in which the tendency of modification of the dye-recording layer by ozone treatment is different from that of the substrate, and then forming a dye-recording layer on the surface of the substrate. A preformat is formed on the dye recording layer by altering the organic dye in the dye recording layer that is in contact with the ozone-treated portion of the substrate. The process of forming unevenness can be eliminated.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 First, a casting acrylic resin substrate with a thickness of 0.411 mm was washed to remove the mold release agent, etc., and dried.
Positive resist (manufactured by Tokyo Ohka Kogyo ■, 0DOR-120
) to a thickness of about 100 mm, and by exposing it through a photomask, the part that will become the guide track is 3#&■,
A preformat pattern of 9H was formed in the portion that would become the recording track.

Next, the surface of the substrate was treated with ozone for 30 to 120 seconds in an ozone atmosphere, and then a diacetone alcohol solution containing 3 wt % of the polymethine dye represented by the structural formula (II) was applied, and after drying, 1000 ± 100 dye recording layers were formed.

Next, this was bonded to an acrylic resin base material having a thickness of 0.31 mm using a hot-melt adhesive made of ethylene-vinyl acetate copolymer to produce an information recording medium.

The obtained information recording medium had a spot diameter of 3 and 1φ.

For a laser beam having a wavelength of 833n-, a contrast of 0.35 to 0.45 for a track crossing signal and a reflectance of 12 to 13% in a recording track portion were obtained.

[Effects of the Invention] As explained above, according to the present invention, the manufacturing process can be simplified by applying ozone treatment to the substrate surface in the shape of a resist preformat pattern and forming a preformat in the dye recording layer. It is possible to increase productivity and improve productivity. That is, it is possible to solve the problems of the conventional stubber type in terms of transfer yield, transfer time, durability of the stubber type, poor mass productivity due to cost, and high price.

[Brief explanation of the drawing]

FIGS. 1(a) to (C) are process diagrams showing an example of the method for manufacturing an information recording medium of the present invention, FIG. 2(a) is an explanatory diagram showing an information recording medium subjected to ozone treatment, and FIG. b) is a partially enlarged view thereof, and FIG. 3 is a schematic cross-sectional view showing a conventional information recording medium. 1... Dye recording layer 1a... Altered portion i'
--Recording track l a-Guide track 2.
...Substrate 2a-1 ozone treatment section 3...
resist

Claims (1)

[Claims] 1. A method for producing an information recording medium, comprising: ozone-treating a substrate surface patterned with a material whose dye-recording layer tends to be modified by ozone treatment differently from that of the substrate; and then forming a dye-recording layer on the substrate surface.