Method of manufacturing an optical Storage disk

US5213600A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Johann Greschner · Neckartenzlingen, DE
• Gerhard Schmid · Mindelheim, DE
• Werner Steiner · Schrobenhausen, DE
• Gerhard Trippel · Sindelfingen, DE
• Olaf Wolter · Aidlingen, DE

Key dates

• Filing date: Nov 22, 1989
• Grant date: May 25, 1993
• Expiry date: Nov 22, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03B2215/45
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An optical storage disk includes a glass substrate (1) into which guide tracks (3) for servo-controlling the focussed light beams are directly stamped in by hot stamp process. After stamping, the glass substrate is thermally quenched in the stamping device to increase its breaking resistance through thermal curing. In order to achieve uniform guide tracks over the entire surface of an optical storage disk, flexible stamp stencils (35) in a flexible holder (34) are used whose curvature can be changed by applying hydro-static pressure. Suitable stamp stencils include monocristalline silicon disks with surface hardening, or of metal disks, structured photolithographic processes. The stamp lands are made with bevelled edges to facilitate the separating of stamp and glass substrate after cooling.