JPS61273759A - Manufacture of optical information recording medium - Google Patents

Abstract

PURPOSE:To eliminate the need to make a substrate insoluble and to realize low-cost manufacture by forming a thin film of organic pigment on a stamper which has signal or guide grooves and then transferring this film to a base as a substrate. CONSTITUTION:Pigment liquid 2 is dripped on the stamper 1. The stamper 1 is rotated to form the thin film 3 of pigment on the projected and recessed surface of the stamper 1 and a transparent film 4 applied with a pressure- sensitive adhesive is pressed against the thin pigment film 3 and then peeled off the stamper 1, so the thin pigment film 3 is transferred to the film while having the projections and recessed of the stamper surface. The stamper uses a nickel stamper, a chromium alloy stamper, etc., and the pigment uses pigment which has a large coefficient of light absorption of >=10<4> preferably, e.g. triphenyl methane pigment, xanthene pigment, etc. Consequently, a recording medium is manufactured at low cost without making its substrate insoluble.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a method for manufacturing an optical information recording medium by a transfer method.

[Prior Art] Optical information recording media that utilize the metallic light-reflecting properties of organic dyes can be manufactured by solution coating, resulting in low manufacturing costs and very high reliability. However, since organic dyes are often difficult to dissolve in solvents, a solvent with strong dissolving power must be used. If plastic is used for the substrate, the uneven signals and guide grooves prepared in advance will disappear due to the solvent. Furthermore, since the dye permeates into the substrate along with the solvent, the metallic luster also disappears (when the recording film is viewed from the substrate side), which causes problems such as insolubilization treatment of the substrate is required.

[Purpose] The present invention has been made in view of the above-mentioned current situation, and its main purpose is to provide a method for inexpensively manufacturing an optical information recording medium having organic colored thread Wali without requiring insolubilization treatment of the substrate. The goal is to provide the following.

[Structure] In order to achieve the above object, the present invention does not directly apply an organic dye thin film on a substrate having uneven signals or guide grooves, but first applies organic dye 81g1 on a stamper and then applies this thin film. A method is adopted in which the image is transferred onto a support that can serve as a substrate.

An example of the method of the invention will now be described with reference to the drawings. 1 to 4 are manufacturing process diagrams of an optical information recording medium according to the present invention. First, as shown in FIG. 1, a dye liquid 2 is dropped onto a stamper 1.

As the stamper, a known stamper can be used, and examples thereof include a nickel stamper, a chromium surface-treated nickel stamper, a chromium-nickel alloy stamper, and the like.

Basically, any type of dye can be used as the dye, but those with a large extinction coefficient, particularly those with a molecular extinction coefficient of 104 or more, are particularly desirable. Examples of dyes include triphenylmethane dyes, xanthine dyes, azine dyes, 'jTJ-n dyes, diphenylpolyene dyes, phthalocyanine dyes, nano-1-quinone dyes, biryllium dyes, squalium dyes, etc. I can give it to you. When solvent coating these dyes, a binder such as nitrocellulose, styrene, etc. may be mixed.

Next, the stamper 1 is rotated to form a dye recording film 3 on the uneven surface of the stamper 1 as shown in FIG. Then,
As shown in FIG. 3, a transparent film 4 coated with a pressure-sensitive adhesive is pressed onto the dye thin film 3, and then the film 4 is peeled off from the stamper 1 as shown in FIG. is transferred while retaining the unevenness of the stamper surface. A film 4 with pressure-sensitive adhesive is an example of a support. The support can serve as a substrate for an information recording medium, and may be in the form of a film or a plate as long as it is flexible. Silicone resin-based and acrylic-based adhesives are often used as pressure-sensitive adhesives. Examples of the film or plate used as a support include plastics such as polynisder, polystyrene, polymethyl methacrylate, polycarbonate, butadiene, vinylidene chloride, and polyethylene.

In the above-described embodiment of the present invention, the dye film 3 is formed by spin coating, but it may also be formed by vapor deposition. In addition, although we have described the case where the transfer of the dye 1 film 3 to the support is carried out using a film with a pressure-sensitive adhesive, it is also possible to use transfer methods such as the thermal transfer method, thermosetting method, and photocuring method described below. can. The thermal transfer method uses a film whose surface is coated with thermoplastic resin instead of a film with pressure-sensitive adhesive, and presses this film against the color N thin film on the stamper while heating it at 0-100°C, and peels it off after cooling. Alternatively, a thermoplastic resin in a molten state is dropped onto the dye is on the stamper, spread uniformly, cooled, and then peeled off. Examples of thermoplastic resins used in this case include polystyrene, polyester, polymethyl methacrylate, and polyvinyl chloride. Also,
The thermosetting method involves dropping a thermosetting resin liquid onto a single dye film on a stamper, pressing the substrate onto it, then curing it with heat, and peeling off the substrate, thermosetting resin, and dye thin film as one unit. It's a method.゛Examples of thermosetting resins used in this case include epoxy resins and urethane resins. Furthermore, the photocuring method involves dropping a photocurable resin liquid onto the dye thin film on the stamper, pressing the transparent substrate onto it, and curing it by irradiating it with light. This is a peeling method. Examples of photocurable resins used in this case include acrylic resins and thiolene resins.

In the optical information recording medium of the present invention produced as described above, recording and reproduction may be performed from the film side or the 34-plate side, or from the dye film side.

[Effects] According to the present invention, an optical information recording medium having an organic dye n film can be manufactured at low cost without requiring solvent insolubilization treatment of the substrate.

[Brief explanation of drawings]

1 to 4 are schematic diagrams illustrating the manufacturing process of the present invention. 1...Stamper 2...Dye liquid 3...
・Dye fill!

Claims (1)

[Claims] 1. A method for manufacturing an optical information recording medium, which comprises providing a thin dye film on a stamper having uneven signal or guide grooves, and then transferring the thin dye film onto a support.