光学記録媒体およびその製造方法

Optical recording medium and its manufacture

Abstract

(57)【要約】 【課題】 高記録密度を実現する光透過層の極めて薄い 光ディスクとその製造方法を提供する。 【解決手段】 レーザ光10が入射する側の面に情報記 録部を有するディスク基板1と、情報記録部上に設けた 反射膜2と、反射膜2上に設けた光透過層3とからなる 光ディスク100において、光透過層3側の外周部位お よび中心孔の周辺部位に、光透過層3の上面と同一平面 を形成する同心円状の凸部8、9をディスク基板1と一 体として設ける。また、前記凸部8、9とディスク基板 1の光透過層3側に情報ピット23を形成する成形機を 構成し、この成形機に、基板材料を加熱しながら注入す る工程と、前記基板形成工程で形成したディスク基板1 の情報ピット面に反射膜2を形成する反射膜形成工程 と、ディスク基板1に形成された反射膜2上に紫外線硬 化樹脂をスピンコート法で塗布し、硬化させて前記光透 過層3を形成する工程により光ディスクを100を形成 する。
PROBLEM TO BE SOLVED: To provide an optical disk with a remarkably thin light transmission layer realizing a high recording density and its manufacture. SOLUTION: An optical disk 100 is constituted of a disk substrate 1 having an information-recording part at a face where a laser light 10 enters, a reflecting film 2 formed on the information-recording part, and a light transmission layer 3 on the reflecting film 2. Concentric projecting parts 8, 9 forming a plane even with an upper face of the light transmission layer 3 are formed in one body with the disk substrate 1 at an outer circumferential part at the side of the light transmission layer 3 of the optical disk and a circumferential part of a center hole of the optical disk. A forming device for forming information pits 23 is constituted at the side of the light transmission layer 3 of the projecting parts 8, 9 and disk substrate 1. The optical disk 100 is formed through steps of heating/injecting a substrate material to the forming device, forming the reflecting film 2 on an information pit face of the disk substrate 1 obtained in the substrate formation step, applying an ultraviolet curving resin onto the reflecting film 2 formed on the disk substrate 1 by spin coating and setting the resin thereby forming the light transmission layer 3. COPYRIGHT: (C)1997,JPO

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Cited By (4)

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    EP-1515325-A2March 16, 2005TDK CorporationMethod for manufacturing a multilayer recording type optical recording medium and an intermediate in the manufacturing process of the same
    EP-1515325-A3April 19, 2006TDK CorporationProcédé de fabrication d'un support d'enregistrement optique à plusieurs couches et d'un produit intermédiaire dans le procédé de se fabrication
    KR-100776850-B1November 16, 2007소니 가부시끼 가이샤광 기록 매체 및 광 기록 재생 장치
    US-6353592-B1March 05, 2002Sony CorporationOptical recording medium and optical disk device