JPH1074341A5

JPH1074341A5 -

Info

Publication number: JPH1074341A5
Application number: JP1996230854A
Authority: JP
Filing date: 1996-08-30
Publication date: 2004-09-09

Description

【０００２】
【従来の技術】
オーディオ用、ビデオ用その他の各種情報を記録する光学記録媒体として、その記録もしくは再生を光照射によって行う光ディスク、光カード、光磁気ディスク、相変化光学記録媒体等のＲＯＭ（ＲｅａｄＯｎｌｙＭｅｍｏｒｙ）型、追記型、書換え型等の光学記録媒体があるが、例えばコンパクトディスク（ＣＤ）におけるようなＲＯＭ型においてその情報記録層にデータ情報、トラッキングサーボ信号等の記録がなされる位相ピット、プリグルーブ等の微細凹凸の形成がなされる。また、追記型、書換え型等の光磁気あるいは相変化等による光磁気媒体においてもプリグルーブ等の微細凹凸の形成がなされる。[0002]
2. Description of the Related Art
Optical recording media for recording various types of information for audio, video, and other purposes include optical recording media such as optical disks, optical cards, magneto-optical disks, and phase-change optical recording media, which record or reproduce by light irradiation, and which are ROM (Read Only Memory ), write-once, and rewritable types. For example, in ROM types such as compact disks (CDs), minute irregularities such as phase pits and pregrooves are formed on the information recording layer for recording data information, tracking servo signals, etc. Furthermore, minute irregularities such as pregrooves are also formed in magneto-optical or phase-change media such as write-once and rewritable types.

Claims

When a part or all of the light transmitting layer of an optical recording medium is formed from a liquid photocurable resin,
A liquid photocurable resin is dropped onto the substrate,
A method for producing an optical recording medium, comprising rotating the substrate to spread the liquid photocurable resin, and simultaneously irradiating the entire surface with light to cure the liquid photocurable resin.

2. The method for manufacturing an optical recording medium according to claim 1, wherein after detecting the thickness of the liquid light-curable resin, the entire surface of the substrate is irradiated with light to cure the liquid light-curable resin.

A method for manufacturing an optical recording medium having at least first and second information recording layers stacked together, comprising:
the first information recording layer is constructed by forming a first fine irregularity that forms the first information recording layer together with the substrate by injection molding at the same time as molding the substrate, or by pressing a stamper onto a photocurable resin sheet, and then forming a reflective film on the first fine irregularity;
the second information recording layer is constructed by forming second fine irregularities that form the second information recording layer by pressing a stamper onto a photocurable resin formed on the first information recording layer, and then forming a semitransparent film on the second fine irregularities;
a method for manufacturing an optical recording medium, comprising: dropping a liquid photocurable resin onto the second information recording layer; rotating the substrate to spread the liquid photocurable resin; and simultaneously irradiating the entire surface with light to harden the liquid photocurable resin and form a light transmitting layer.

4. The method for manufacturing an optical recording medium according to claim 3, wherein the light-transmitting layer is formed by laminating a transparent sheet of a uniform thickness made of a photocurable resin on the liquid photocurable resin.

A method for manufacturing an optical recording medium having at least first and second information recording layers stacked together, comprising:
forming first and second fine projections and depressions on both sides of a transparent sheet made of a photocurable resin by pressing a stamper thereon, the first and second fine projections and depressions forming the first and second information recording layers;
forming a reflective film on the first minute concave-convex structure to form the first information recording layer;
forming a semi-transparent film on the second fine irregularities to form the second information recording layer;
a method for manufacturing an optical recording medium, comprising: laminating the transparent sheet on a substrate with the first information recording layer side facing the substrate; dripping a liquid photocurable resin onto the second information recording layer; rotating the substrate to spread the liquid photocurable resin; and simultaneously irradiating the entire surface with light to cure the liquid photocurable resin, thereby forming a light transmitting layer.