Manufacturing method of optical disk and its manufacturing apparatus

Abstract

A manufacturing method of an optical disk in which information recording layers are formed onto a resin layer laminated on a substrate surface. The substrate surface is coated with the resin layer. The substrate and a stamper are arranged into a vacuum chamber so that the resin layer surface and the stamper surface with concave / convex portions face almost in parallel. The chamber is set into an almost vacuum state while holding the facing state of the substrate and the stamper. The chamber is changed from the almost vacuum state to an atmospheric pressure or higher. The substrate and the stamper are overlaid. The stamper is pressed by a differential pressure between the almost vacuum pressure and the atmospheric pressure or higher, thereby adhering the substrate and the stamper and transferring the concave / convex portions to the resin layer. The resin layer with the transferred concave / convex portions is hardened.

Description

technical field

[0001] The present invention relates to an optical disc manufacturing method and an optical disc manufacturing apparatus, and more particularly, to an optical disc manufacturing method and an optical disc manufacturing apparatus applied to, for example, a multilayer optical disc including two or more information recording layers. Background technique

[0002] In recent years, in the field of optical discs, optical discs with a large recording capacity have been demanded. In order to realize a large recording capacity, it is desirable to use a multilayer optical disc having a plurality of information recording layers (refer to Patent Document JP-A-2003-91868). Among them, an optical disc including two information recording layers may be the first to be put into practical use. In a read-only optical disc, a reflective film made of silver, aluminum, or the like is formed. In a recordable optical disc, a recording film made of, for example, a phase-change type ...

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