Making a data-carrying optical disk

US5192474A · kind A · utility

Assignee

• KraussMaffei GmbH · DE

Inventors

• Martin Eichlseder · Tettenweis, DE
• Peter Lichtinger · Fürstenfeldbruck, DE

Key dates

• Filing date: May 15, 1992
• Grant date: Mar 9, 1993
• Expiry date: May 15, 2012

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29L2017/005
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

An optical disk having a pair of axially oppositely directed faces and an annular outer periphery is made by first forming a mold cavity corresponding to the shape of the disk between a pair of axially spaced parts and a demolding ring sandwiched between the parts. The cavity is then filled with a hardenable resin such that the parts form the respective faces and an inner periphery of the ring forms the outer periphery of the disk and the resin is at least partially hardened in the cavity. The parts are then axially oppositely separated from each other and from the disk to leave the disk in the ring with both of its faces exposed and the ring is then transversely displaced with the disk engaged in it out from between the mold parts. The disk is then cooled and shrunk such that its outer periphery separates from the inner periphery of the ring and the disk separates from the ring.